* POSSIBILITY OF SUCH DAMAGE.
*/
-#define REDIS_VERSION "1.050"
+#define REDIS_VERSION "1.3.2"
#include "fmacros.h"
#include "config.h"
#include <fcntl.h>
#include <sys/time.h>
#include <sys/resource.h>
+#include <sys/uio.h>
#include <limits.h>
#include <math.h>
#define REDIS_MAX_SYNC_TIME 60 /* Slave can't take more to sync */
#define REDIS_EXPIRELOOKUPS_PER_CRON 100 /* try to expire 100 keys/second */
#define REDIS_MAX_WRITE_PER_EVENT (1024*64)
-#define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
+#define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
+
+/* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
+#define REDIS_WRITEV_THRESHOLD 3
+/* Max number of iovecs used for each writev call */
+#define REDIS_WRITEV_IOVEC_COUNT 256
/* Hash table parameters */
#define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */
#define REDIS_RDB_ENC_INT32 2 /* 32 bit signed integer */
#define REDIS_RDB_ENC_LZF 3 /* string compressed with FASTLZ */
+/* Virtual memory object->where field. */
+#define REDIS_VM_MEMORY 0 /* The object is on memory */
+#define REDIS_VM_SWAPPED 1 /* The object is on disk */
+#define REDIS_VM_SWAPPING 2 /* Redis is swapping this object on disk */
+#define REDIS_VM_LOADING 3 /* Redis is loading this object from disk */
+
+/* Virtual memory static configuration stuff.
+ * Check vmFindContiguousPages() to know more about this magic numbers. */
+#define REDIS_VM_MAX_NEAR_PAGES 65536
+#define REDIS_VM_MAX_RANDOM_JUMP 4096
+
/* Client flags */
#define REDIS_CLOSE 1 /* This client connection should be closed ASAP */
#define REDIS_SLAVE 2 /* This client is a slave server */
#define REDIS_MASTER 4 /* This client is a master server */
#define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */
+#define REDIS_MULTI 16 /* This client is in a MULTI context */
+#define REDIS_BLOCKED 32 /* The client is waiting in a blocking operation */
/* Slave replication state - slave side */
#define REDIS_REPL_NONE 0 /* No active replication */
#define APPENDFSYNC_ALWAYS 1
#define APPENDFSYNC_EVERYSEC 2
+/* We can print the stacktrace, so our assert is defined this way: */
+#define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e),exit(1)))
+static void _redisAssert(char *estr);
+
/*================================= Data types ============================== */
/* A redis object, that is a type able to hold a string / list / set */
+
+/* The VM object structure */
+struct redisObjectVM {
+ off_t page; /* the page at witch the object is stored on disk */
+ off_t usedpages; /* number of pages used on disk */
+ time_t atime; /* Last access time */
+} vm;
+
+/* The actual Redis Object */
typedef struct redisObject {
void *ptr;
unsigned char type;
unsigned char encoding;
- unsigned char notused[2];
+ unsigned char storage; /* where? REDIS_VM_MEMORY, REDIS_VM_SWAPPED, ... */
+ unsigned char notused;
int refcount;
+ /* VM fields, this are only allocated if VM is active, otherwise the
+ * object allocation function will just allocate
+ * sizeof(redisObjct) minus sizeof(redisObjectVM), so using
+ * Redis without VM active will not have any overhead. */
+ struct redisObjectVM vm;
} robj;
+/* Macro used to initalize a Redis object allocated on the stack.
+ * Note that this macro is taken near the structure definition to make sure
+ * we'll update it when the structure is changed, to avoid bugs like
+ * bug #85 introduced exactly in this way. */
+#define initStaticStringObject(_var,_ptr) do { \
+ _var.refcount = 1; \
+ _var.type = REDIS_STRING; \
+ _var.encoding = REDIS_ENCODING_RAW; \
+ _var.ptr = _ptr; \
+ if (server.vm_enabled) _var.storage = REDIS_VM_MEMORY; \
+} while(0);
+
typedef struct redisDb {
- dict *dict;
- dict *expires;
+ dict *dict; /* The keyspace for this DB */
+ dict *expires; /* Timeout of keys with a timeout set */
+ dict *blockingkeys; /* Keys with clients waiting for data (BLPOP) */
int id;
} redisDb;
+/* Client MULTI/EXEC state */
+typedef struct multiCmd {
+ robj **argv;
+ int argc;
+ struct redisCommand *cmd;
+} multiCmd;
+
+typedef struct multiState {
+ multiCmd *commands; /* Array of MULTI commands */
+ int count; /* Total number of MULTI commands */
+} multiState;
+
/* With multiplexing we need to take per-clinet state.
* Clients are taken in a liked list. */
typedef struct redisClient {
int sentlen;
time_t lastinteraction; /* time of the last interaction, used for timeout */
int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
+ /* REDIS_MULTI */
int slaveseldb; /* slave selected db, if this client is a slave */
int authenticated; /* when requirepass is non-NULL */
int replstate; /* replication state if this is a slave */
int repldbfd; /* replication DB file descriptor */
- long repldboff; /* replication DB file offset */
+ long repldboff; /* replication DB file offset */
off_t repldbsize; /* replication DB file size */
+ multiState mstate; /* MULTI/EXEC state */
+ robj **blockingkeys; /* The key we waiting to terminate a blocking
+ * operation such as BLPOP. Otherwise NULL. */
+ int blockingkeysnum; /* Number of blocking keys */
+ time_t blockingto; /* Blocking operation timeout. If UNIX current time
+ * is >= blockingto then the operation timed out. */
} redisClient;
struct saveparam {
int port;
int fd;
redisDb *db;
- dict *sharingpool;
+ dict *sharingpool; /* Poll used for object sharing */
unsigned int sharingpoolsize;
long long dirty; /* changes to DB from the last save */
list *clients;
int appendfd;
int appendseldb;
char *pidfile;
- int bgsaveinprogress;
pid_t bgsavechildpid;
+ pid_t bgrewritechildpid;
+ sds bgrewritebuf; /* buffer taken by parent during oppend only rewrite */
struct saveparam *saveparams;
int saveparamslen;
char *logfile;
char *appendfilename;
char *requirepass;
int shareobjects;
+ int rdbcompression;
/* Replication related */
int isslave;
char *masterauth;
int replstate;
unsigned int maxclients;
unsigned long maxmemory;
+ unsigned int blockedclients;
/* Sort parameters - qsort_r() is only available under BSD so we
* have to take this state global, in order to pass it to sortCompare() */
int sort_desc;
int sort_alpha;
int sort_bypattern;
+ /* Virtual memory configuration */
+ int vm_enabled;
+ off_t vm_page_size;
+ off_t vm_pages;
+ long vm_max_memory;
+ /* Virtual memory state */
+ FILE *vm_fp;
+ int vm_fd;
+ off_t vm_next_page; /* Next probably empty page */
+ off_t vm_near_pages; /* Number of pages allocated sequentially */
+ unsigned char *vm_bitmap; /* Bitmap of free/used pages */
+ time_t unixtime; /* Unix time sampled every second. */
};
typedef void redisCommandProc(redisClient *c);
struct sharedObjectsStruct {
robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *pong, *space,
- *colon, *nullbulk, *nullmultibulk,
+ *colon, *nullbulk, *nullmultibulk, *queued,
*emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
*outofrangeerr, *plus,
*select0, *select1, *select2, *select3, *select4,
static int syncWithMaster(void);
static robj *tryObjectSharing(robj *o);
static int tryObjectEncoding(robj *o);
-static robj *getDecodedObject(const robj *o);
+static robj *getDecodedObject(robj *o);
static int removeExpire(redisDb *db, robj *key);
static int expireIfNeeded(redisDb *db, robj *key);
static int deleteIfVolatile(redisDb *db, robj *key);
static int processCommand(redisClient *c);
static void setupSigSegvAction(void);
static void rdbRemoveTempFile(pid_t childpid);
+static void aofRemoveTempFile(pid_t childpid);
static size_t stringObjectLen(robj *o);
static void processInputBuffer(redisClient *c);
static zskiplist *zslCreate(void);
static void zslFree(zskiplist *zsl);
static void zslInsert(zskiplist *zsl, double score, robj *obj);
+static void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
+static void initClientMultiState(redisClient *c);
+static void freeClientMultiState(redisClient *c);
+static void queueMultiCommand(redisClient *c, struct redisCommand *cmd);
+static void unblockClient(redisClient *c);
+static int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
+static void vmInit(void);
+static void vmMarkPagesFree(off_t page, off_t count);
+static robj *vmLoadObject(robj *key);
static void authCommand(redisClient *c);
static void pingCommand(redisClient *c);
static void lastsaveCommand(redisClient *c);
static void saveCommand(redisClient *c);
static void bgsaveCommand(redisClient *c);
+static void bgrewriteaofCommand(redisClient *c);
static void shutdownCommand(redisClient *c);
static void moveCommand(redisClient *c);
static void renameCommand(redisClient *c);
static void flushallCommand(redisClient *c);
static void sortCommand(redisClient *c);
static void lremCommand(redisClient *c);
+static void rpoplpushcommand(redisClient *c);
static void infoCommand(redisClient *c);
static void mgetCommand(redisClient *c);
static void monitorCommand(redisClient *c);
static void msetCommand(redisClient *c);
static void msetnxCommand(redisClient *c);
static void zaddCommand(redisClient *c);
+static void zincrbyCommand(redisClient *c);
static void zrangeCommand(redisClient *c);
static void zrangebyscoreCommand(redisClient *c);
static void zrevrangeCommand(redisClient *c);
static void zremCommand(redisClient *c);
static void zscoreCommand(redisClient *c);
static void zremrangebyscoreCommand(redisClient *c);
+static void multiCommand(redisClient *c);
+static void execCommand(redisClient *c);
+static void blpopCommand(redisClient *c);
+static void brpopCommand(redisClient *c);
/*================================= Globals ================================= */
{"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"rpop",rpopCommand,2,REDIS_CMD_INLINE},
{"lpop",lpopCommand,2,REDIS_CMD_INLINE},
+ {"brpop",brpopCommand,-3,REDIS_CMD_INLINE},
+ {"blpop",blpopCommand,-3,REDIS_CMD_INLINE},
{"llen",llenCommand,2,REDIS_CMD_INLINE},
{"lindex",lindexCommand,3,REDIS_CMD_INLINE},
{"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"lrange",lrangeCommand,4,REDIS_CMD_INLINE},
{"ltrim",ltrimCommand,4,REDIS_CMD_INLINE},
{"lrem",lremCommand,4,REDIS_CMD_BULK},
+ {"rpoplpush",rpoplpushcommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"srem",sremCommand,3,REDIS_CMD_BULK},
{"smove",smoveCommand,4,REDIS_CMD_BULK},
{"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
{"smembers",sinterCommand,2,REDIS_CMD_INLINE},
{"zadd",zaddCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
+ {"zincrby",zincrbyCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"zrem",zremCommand,3,REDIS_CMD_BULK},
{"zremrangebyscore",zremrangebyscoreCommand,4,REDIS_CMD_INLINE},
- {"zrange",zrangeCommand,4,REDIS_CMD_INLINE},
- {"zrangebyscore",zrangebyscoreCommand,4,REDIS_CMD_INLINE},
- {"zrevrange",zrevrangeCommand,4,REDIS_CMD_INLINE},
+ {"zrange",zrangeCommand,-4,REDIS_CMD_INLINE},
+ {"zrangebyscore",zrangebyscoreCommand,-4,REDIS_CMD_INLINE},
+ {"zrevrange",zrevrangeCommand,-4,REDIS_CMD_INLINE},
{"zcard",zcardCommand,2,REDIS_CMD_INLINE},
{"zscore",zscoreCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
{"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
{"echo",echoCommand,2,REDIS_CMD_BULK},
{"save",saveCommand,1,REDIS_CMD_INLINE},
{"bgsave",bgsaveCommand,1,REDIS_CMD_INLINE},
+ {"bgrewriteaof",bgrewriteaofCommand,1,REDIS_CMD_INLINE},
{"shutdown",shutdownCommand,1,REDIS_CMD_INLINE},
{"lastsave",lastsaveCommand,1,REDIS_CMD_INLINE},
{"type",typeCommand,2,REDIS_CMD_INLINE},
+ {"multi",multiCommand,1,REDIS_CMD_INLINE},
+ {"exec",execCommand,1,REDIS_CMD_INLINE},
{"sync",syncCommand,1,REDIS_CMD_INLINE},
{"flushdb",flushdbCommand,1,REDIS_CMD_INLINE},
{"flushall",flushallCommand,1,REDIS_CMD_INLINE},
{"debug",debugCommand,-2,REDIS_CMD_INLINE},
{NULL,NULL,0,0}
};
+
/*============================ Utility functions ============================ */
/* Glob-style pattern matching. */
zfree(val);
}
+static void dictListDestructor(void *privdata, void *val)
+{
+ DICT_NOTUSED(privdata);
+ listRelease((list*)val);
+}
+
static int sdsDictKeyCompare(void *privdata, const void *key1,
const void *key2)
{
{
DICT_NOTUSED(privdata);
+ if (val == NULL) return; /* Values of swapped out keys as set to NULL */
decrRefCount(val);
}
static int dictEncObjKeyCompare(void *privdata, const void *key1,
const void *key2)
{
- const robj *o1 = key1, *o2 = key2;
-
- if (o1->encoding == REDIS_ENCODING_RAW &&
- o2->encoding == REDIS_ENCODING_RAW)
- return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
- else {
- robj *dec1, *dec2;
- int cmp;
+ robj *o1 = (robj*) key1, *o2 = (robj*) key2;
+ int cmp;
- dec1 = o1->encoding != REDIS_ENCODING_RAW ?
- getDecodedObject(o1) : (robj*)o1;
- dec2 = o2->encoding != REDIS_ENCODING_RAW ?
- getDecodedObject(o2) : (robj*)o2;
- cmp = sdsDictKeyCompare(privdata,dec1->ptr,dec2->ptr);
- if (dec1 != o1) decrRefCount(dec1);
- if (dec2 != o2) decrRefCount(dec2);
- return cmp;
- }
+ o1 = getDecodedObject(o1);
+ o2 = getDecodedObject(o2);
+ cmp = sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
+ decrRefCount(o1);
+ decrRefCount(o2);
+ return cmp;
}
static unsigned int dictEncObjHash(const void *key) {
- const robj *o = key;
+ robj *o = (robj*) key;
- if (o->encoding == REDIS_ENCODING_RAW)
- return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
- else {
- robj *dec = getDecodedObject(o);
- unsigned int hash = dictGenHashFunction(dec->ptr, sdslen((sds)dec->ptr));
- decrRefCount(dec);
- return hash;
- }
+ o = getDecodedObject(o);
+ unsigned int hash = dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
+ decrRefCount(o);
+ return hash;
}
static dictType setDictType = {
NULL, /* val dup */
dictEncObjKeyCompare, /* key compare */
dictRedisObjectDestructor, /* key destructor */
- dictVanillaFree /* val destructor */
+ dictVanillaFree /* val destructor of malloc(sizeof(double)) */
};
static dictType hashDictType = {
dictRedisObjectDestructor /* val destructor */
};
+/* Keylist hash table type has unencoded redis objects as keys and
+ * lists as values. It's used for blocking operations (BLPOP) */
+static dictType keylistDictType = {
+ dictObjHash, /* hash function */
+ NULL, /* key dup */
+ NULL, /* val dup */
+ dictObjKeyCompare, /* key compare */
+ dictRedisObjectDestructor, /* key destructor */
+ dictListDestructor /* val destructor */
+};
+
/* ========================= Random utility functions ======================= */
/* Redis generally does not try to recover from out of memory conditions
* is based on heap allocation for send buffers, so we simply abort.
* At least the code will be simpler to read... */
static void oom(const char *msg) {
- fprintf(stderr, "%s: Out of memory\n",msg);
- fflush(stderr);
+ redisLog(REDIS_WARNING, "%s: Out of memory\n",msg);
sleep(1);
abort();
}
listRewind(server.clients);
while ((ln = listYield(server.clients)) != NULL) {
c = listNodeValue(ln);
- if (!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
+ if (server.maxidletime &&
+ !(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
!(c->flags & REDIS_MASTER) && /* no timeout for masters */
- (now - c->lastinteraction > server.maxidletime)) {
+ (now - c->lastinteraction > server.maxidletime))
+ {
redisLog(REDIS_DEBUG,"Closing idle client");
freeClient(c);
+ } else if (c->flags & REDIS_BLOCKED) {
+ if (c->blockingto != 0 && c->blockingto < now) {
+ addReply(c,shared.nullmultibulk);
+ unblockClient(c);
+ }
}
}
}
}
}
+/* A background saving child (BGSAVE) terminated its work. Handle this. */
+void backgroundSaveDoneHandler(int statloc) {
+ int exitcode = WEXITSTATUS(statloc);
+ int bysignal = WIFSIGNALED(statloc);
+
+ if (!bysignal && exitcode == 0) {
+ redisLog(REDIS_NOTICE,
+ "Background saving terminated with success");
+ server.dirty = 0;
+ server.lastsave = time(NULL);
+ } else if (!bysignal && exitcode != 0) {
+ redisLog(REDIS_WARNING, "Background saving error");
+ } else {
+ redisLog(REDIS_WARNING,
+ "Background saving terminated by signal");
+ rdbRemoveTempFile(server.bgsavechildpid);
+ }
+ server.bgsavechildpid = -1;
+ /* Possibly there are slaves waiting for a BGSAVE in order to be served
+ * (the first stage of SYNC is a bulk transfer of dump.rdb) */
+ updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
+}
+
+/* A background append only file rewriting (BGREWRITEAOF) terminated its work.
+ * Handle this. */
+void backgroundRewriteDoneHandler(int statloc) {
+ int exitcode = WEXITSTATUS(statloc);
+ int bysignal = WIFSIGNALED(statloc);
+
+ if (!bysignal && exitcode == 0) {
+ int fd;
+ char tmpfile[256];
+
+ redisLog(REDIS_NOTICE,
+ "Background append only file rewriting terminated with success");
+ /* Now it's time to flush the differences accumulated by the parent */
+ snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) server.bgrewritechildpid);
+ fd = open(tmpfile,O_WRONLY|O_APPEND);
+ if (fd == -1) {
+ redisLog(REDIS_WARNING, "Not able to open the temp append only file produced by the child: %s", strerror(errno));
+ goto cleanup;
+ }
+ /* Flush our data... */
+ if (write(fd,server.bgrewritebuf,sdslen(server.bgrewritebuf)) !=
+ (signed) sdslen(server.bgrewritebuf)) {
+ redisLog(REDIS_WARNING, "Error or short write trying to flush the parent diff of the append log file in the child temp file: %s", strerror(errno));
+ close(fd);
+ goto cleanup;
+ }
+ redisLog(REDIS_NOTICE,"Parent diff flushed into the new append log file with success (%lu bytes)",sdslen(server.bgrewritebuf));
+ /* Now our work is to rename the temp file into the stable file. And
+ * switch the file descriptor used by the server for append only. */
+ if (rename(tmpfile,server.appendfilename) == -1) {
+ redisLog(REDIS_WARNING,"Can't rename the temp append only file into the stable one: %s", strerror(errno));
+ close(fd);
+ goto cleanup;
+ }
+ /* Mission completed... almost */
+ redisLog(REDIS_NOTICE,"Append only file successfully rewritten.");
+ if (server.appendfd != -1) {
+ /* If append only is actually enabled... */
+ close(server.appendfd);
+ server.appendfd = fd;
+ fsync(fd);
+ server.appendseldb = -1; /* Make sure it will issue SELECT */
+ redisLog(REDIS_NOTICE,"The new append only file was selected for future appends.");
+ } else {
+ /* If append only is disabled we just generate a dump in this
+ * format. Why not? */
+ close(fd);
+ }
+ } else if (!bysignal && exitcode != 0) {
+ redisLog(REDIS_WARNING, "Background append only file rewriting error");
+ } else {
+ redisLog(REDIS_WARNING,
+ "Background append only file rewriting terminated by signal");
+ }
+cleanup:
+ sdsfree(server.bgrewritebuf);
+ server.bgrewritebuf = sdsempty();
+ aofRemoveTempFile(server.bgrewritechildpid);
+ server.bgrewritechildpid = -1;
+}
+
static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
int j, loops = server.cronloops++;
REDIS_NOTUSED(eventLoop);
REDIS_NOTUSED(id);
REDIS_NOTUSED(clientData);
+ /* We take a cached value of the unix time in the global state because
+ * with virtual memory and aging there is to store the current time
+ * in objects at every object access, and accuracy is not needed.
+ * To access a global var is faster than calling time(NULL) */
+ server.unixtime = time(NULL);
+
/* Update the global state with the amount of used memory */
server.usedmemory = zmalloc_used_memory();
* if we resize the HT while there is the saving child at work actually
* a lot of memory movements in the parent will cause a lot of pages
* copied. */
- if (!server.bgsaveinprogress) tryResizeHashTables();
+ if (server.bgsavechildpid == -1) tryResizeHashTables();
/* Show information about connected clients */
if (!(loops % 5)) {
}
/* Close connections of timedout clients */
- if (server.maxidletime && !(loops % 10))
+ if ((server.maxidletime && !(loops % 10)) || server.blockedclients)
closeTimedoutClients();
- /* Check if a background saving in progress terminated */
- if (server.bgsaveinprogress) {
+ /* Check if a background saving or AOF rewrite in progress terminated */
+ if (server.bgsavechildpid != -1 || server.bgrewritechildpid != -1) {
int statloc;
- if (wait4(-1,&statloc,WNOHANG,NULL)) {
- int exitcode = WEXITSTATUS(statloc);
- int bysignal = WIFSIGNALED(statloc);
-
- if (!bysignal && exitcode == 0) {
- redisLog(REDIS_NOTICE,
- "Background saving terminated with success");
- server.dirty = 0;
- server.lastsave = time(NULL);
- } else if (!bysignal && exitcode != 0) {
- redisLog(REDIS_WARNING, "Background saving error");
+ pid_t pid;
+
+ if ((pid = wait3(&statloc,WNOHANG,NULL)) != 0) {
+ if (pid == server.bgsavechildpid) {
+ backgroundSaveDoneHandler(statloc);
} else {
- redisLog(REDIS_WARNING,
- "Background saving terminated by signal");
- rdbRemoveTempFile(server.bgsavechildpid);
+ backgroundRewriteDoneHandler(statloc);
}
- server.bgsaveinprogress = 0;
- server.bgsavechildpid = -1;
- updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
}
} else {
/* If there is not a background saving in progress check if
}
}
- /* Try to expire a few timed out keys */
+ /* Try to expire a few timed out keys. The algorithm used is adaptive and
+ * will use few CPU cycles if there are few expiring keys, otherwise
+ * it will get more aggressive to avoid that too much memory is used by
+ * keys that can be removed from the keyspace. */
for (j = 0; j < server.dbnum; j++) {
+ int expired;
redisDb *db = server.db+j;
- int num = dictSize(db->expires);
- if (num) {
+ /* Continue to expire if at the end of the cycle more than 25%
+ * of the keys were expired. */
+ do {
+ int num = dictSize(db->expires);
time_t now = time(NULL);
+ expired = 0;
if (num > REDIS_EXPIRELOOKUPS_PER_CRON)
num = REDIS_EXPIRELOOKUPS_PER_CRON;
while (num--) {
t = (time_t) dictGetEntryVal(de);
if (now > t) {
deleteKey(db,dictGetEntryKey(de));
+ expired++;
}
}
- }
+ } while (expired > REDIS_EXPIRELOOKUPS_PER_CRON/4);
}
/* Check if we should connect to a MASTER */
shared.nullbulk = createObject(REDIS_STRING,sdsnew("$-1\r\n"));
shared.nullmultibulk = createObject(REDIS_STRING,sdsnew("*-1\r\n"));
shared.emptymultibulk = createObject(REDIS_STRING,sdsnew("*0\r\n"));
- /* no such key */
shared.pong = createObject(REDIS_STRING,sdsnew("+PONG\r\n"));
+ shared.queued = createObject(REDIS_STRING,sdsnew("+QUEUED\r\n"));
shared.wrongtypeerr = createObject(REDIS_STRING,sdsnew(
"-ERR Operation against a key holding the wrong kind of value\r\n"));
shared.nokeyerr = createObject(REDIS_STRING,sdsnew(
server.saveparamslen++;
}
-static void ResetServerSaveParams() {
+static void resetServerSaveParams() {
zfree(server.saveparams);
server.saveparams = NULL;
server.saveparamslen = 0;
server.appendseldb = -1; /* Make sure the first time will not match */
server.pidfile = "/var/run/redis.pid";
server.dbfilename = "dump.rdb";
- server.appendfilename = "appendonly.log";
+ server.appendfilename = "appendonly.aof";
server.requirepass = NULL;
server.shareobjects = 0;
+ server.rdbcompression = 1;
server.sharingpoolsize = 1024;
server.maxclients = 0;
+ server.blockedclients = 0;
server.maxmemory = 0;
- ResetServerSaveParams();
+ server.vm_enabled = 0;
+ server.vm_page_size = 256; /* 256 bytes per page */
+ server.vm_pages = 1024*1024*100; /* 104 millions of pages */
+ server.vm_max_memory = 1024LL*1024*1024*1; /* 1 GB of RAM */
+
+ resetServerSaveParams();
appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */
appendServerSaveParams(300,100); /* save after 5 minutes and 100 changes */
for (j = 0; j < server.dbnum; j++) {
server.db[j].dict = dictCreate(&hashDictType,NULL);
server.db[j].expires = dictCreate(&setDictType,NULL);
+ server.db[j].blockingkeys = dictCreate(&keylistDictType,NULL);
server.db[j].id = j;
}
server.cronloops = 0;
- server.bgsaveinprogress = 0;
server.bgsavechildpid = -1;
+ server.bgrewritechildpid = -1;
+ server.bgrewritebuf = sdsempty();
server.lastsave = time(NULL);
server.dirty = 0;
server.usedmemory = 0;
server.stat_numcommands = 0;
server.stat_numconnections = 0;
server.stat_starttime = time(NULL);
+ server.unixtime = time(NULL);
aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL);
if (server.appendonly) {
exit(1);
}
}
+
+ if (server.vm_enabled) vmInit();
}
/* Empty the whole database */
if ((server.shareobjects = yesnotoi(argv[1])) == -1) {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
+ } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
+ if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
+ err = "argument must be 'yes' or 'no'"; goto loaderr;
+ }
} else if (!strcasecmp(argv[0],"shareobjectspoolsize") && argc == 2) {
server.sharingpoolsize = atoi(argv[1]);
if (server.sharingpoolsize < 1) {
server.pidfile = zstrdup(argv[1]);
} else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
server.dbfilename = zstrdup(argv[1]);
+ } else if (!strcasecmp(argv[0],"vm-enabled") && argc == 2) {
+ if ((server.vm_enabled = yesnotoi(argv[1])) == -1) {
+ err = "argument must be 'yes' or 'no'"; goto loaderr;
+ }
} else {
err = "Bad directive or wrong number of arguments"; goto loaderr;
}
static void freeClient(redisClient *c) {
listNode *ln;
+ /* Note that if the client we are freeing is blocked into a blocking
+ * call, we have to set querybuf to NULL *before* to call unblockClient()
+ * to avoid processInputBuffer() will get called. Also it is important
+ * to remove the file events after this, because this call adds
+ * the READABLE event. */
+ sdsfree(c->querybuf);
+ c->querybuf = NULL;
+ if (c->flags & REDIS_BLOCKED)
+ unblockClient(c);
+
aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
- sdsfree(c->querybuf);
listRelease(c->reply);
freeClientArgv(c);
close(c->fd);
ln = listSearchKey(server.clients,c);
- assert(ln != NULL);
+ redisAssert(ln != NULL);
listDelNode(server.clients,ln);
if (c->flags & REDIS_SLAVE) {
if (c->replstate == REDIS_REPL_SEND_BULK && c->repldbfd != -1)
close(c->repldbfd);
list *l = (c->flags & REDIS_MONITOR) ? server.monitors : server.slaves;
ln = listSearchKey(l,c);
- assert(ln != NULL);
+ redisAssert(ln != NULL);
listDelNode(l,ln);
}
if (c->flags & REDIS_MASTER) {
}
zfree(c->argv);
zfree(c->mbargv);
+ freeClientMultiState(c);
zfree(c);
}
+#define GLUEREPLY_UP_TO (1024)
static void glueReplyBuffersIfNeeded(redisClient *c) {
- int totlen = 0;
+ int copylen = 0;
+ char buf[GLUEREPLY_UP_TO];
listNode *ln;
robj *o;
listRewind(c->reply);
while((ln = listYield(c->reply))) {
+ int objlen;
+
o = ln->value;
- totlen += sdslen(o->ptr);
- /* This optimization makes more sense if we don't have to copy
- * too much data */
- if (totlen > 1024) return;
- }
- if (totlen > 0) {
- char buf[1024];
- int copylen = 0;
-
- listRewind(c->reply);
- while((ln = listYield(c->reply))) {
- o = ln->value;
- memcpy(buf+copylen,o->ptr,sdslen(o->ptr));
- copylen += sdslen(o->ptr);
+ objlen = sdslen(o->ptr);
+ if (copylen + objlen <= GLUEREPLY_UP_TO) {
+ memcpy(buf+copylen,o->ptr,objlen);
+ copylen += objlen;
listDelNode(c->reply,ln);
+ } else {
+ if (copylen == 0) return;
+ break;
}
- /* Now the output buffer is empty, add the new single element */
- o = createObject(REDIS_STRING,sdsnewlen(buf,totlen));
- listAddNodeTail(c->reply,o);
}
+ /* Now the output buffer is empty, add the new single element */
+ o = createObject(REDIS_STRING,sdsnewlen(buf,copylen));
+ listAddNodeHead(c->reply,o);
}
static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
- if (server.glueoutputbuf && listLength(c->reply) > 1)
- glueReplyBuffersIfNeeded(c);
+ /* Use writev() if we have enough buffers to send */
+ if (!server.glueoutputbuf &&
+ listLength(c->reply) > REDIS_WRITEV_THRESHOLD &&
+ !(c->flags & REDIS_MASTER))
+ {
+ sendReplyToClientWritev(el, fd, privdata, mask);
+ return;
+ }
+
while(listLength(c->reply)) {
+ if (server.glueoutputbuf && listLength(c->reply) > 1)
+ glueReplyBuffersIfNeeded(c);
+
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);
c->sentlen = 0;
}
/* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT
- * bytes, in a single threaded server it's a good idea to server
+ * bytes, in a single threaded server it's a good idea to serve
* other clients as well, even if a very large request comes from
* super fast link that is always able to accept data (in real world
- * terms think to 'KEYS *' against the loopback interfae) */
+ * scenario think about 'KEYS *' against the loopback interfae) */
if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break;
}
if (nwritten == -1) {
}
}
+static void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask)
+{
+ redisClient *c = privdata;
+ int nwritten = 0, totwritten = 0, objlen, willwrite;
+ robj *o;
+ struct iovec iov[REDIS_WRITEV_IOVEC_COUNT];
+ int offset, ion = 0;
+ REDIS_NOTUSED(el);
+ REDIS_NOTUSED(mask);
+
+ listNode *node;
+ while (listLength(c->reply)) {
+ offset = c->sentlen;
+ ion = 0;
+ willwrite = 0;
+
+ /* fill-in the iov[] array */
+ for(node = listFirst(c->reply); node; node = listNextNode(node)) {
+ o = listNodeValue(node);
+ objlen = sdslen(o->ptr);
+
+ if (totwritten + objlen - offset > REDIS_MAX_WRITE_PER_EVENT)
+ break;
+
+ if(ion == REDIS_WRITEV_IOVEC_COUNT)
+ break; /* no more iovecs */
+
+ iov[ion].iov_base = ((char*)o->ptr) + offset;
+ iov[ion].iov_len = objlen - offset;
+ willwrite += objlen - offset;
+ offset = 0; /* just for the first item */
+ ion++;
+ }
+
+ if(willwrite == 0)
+ break;
+
+ /* write all collected blocks at once */
+ if((nwritten = writev(fd, iov, ion)) < 0) {
+ if (errno != EAGAIN) {
+ redisLog(REDIS_DEBUG,
+ "Error writing to client: %s", strerror(errno));
+ freeClient(c);
+ return;
+ }
+ break;
+ }
+
+ totwritten += nwritten;
+ offset = c->sentlen;
+
+ /* remove written robjs from c->reply */
+ while (nwritten && listLength(c->reply)) {
+ o = listNodeValue(listFirst(c->reply));
+ objlen = sdslen(o->ptr);
+
+ if(nwritten >= objlen - offset) {
+ listDelNode(c->reply, listFirst(c->reply));
+ nwritten -= objlen - offset;
+ c->sentlen = 0;
+ } else {
+ /* partial write */
+ c->sentlen += nwritten;
+ break;
+ }
+ offset = 0;
+ }
+ }
+
+ if (totwritten > 0)
+ c->lastinteraction = time(NULL);
+
+ if (listLength(c->reply) == 0) {
+ c->sentlen = 0;
+ aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
+ }
+}
+
static struct redisCommand *lookupCommand(char *name) {
int j = 0;
while(cmdTable[j].name != NULL) {
c->multibulk = 0;
}
+/* Call() is the core of Redis execution of a command */
+static void call(redisClient *c, struct redisCommand *cmd) {
+ long long dirty;
+
+ dirty = server.dirty;
+ cmd->proc(c);
+ if (server.appendonly && server.dirty-dirty)
+ feedAppendOnlyFile(cmd,c->db->id,c->argv,c->argc);
+ if (server.dirty-dirty && listLength(server.slaves))
+ replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc);
+ if (listLength(server.monitors))
+ replicationFeedSlaves(server.monitors,cmd,c->db->id,c->argv,c->argc);
+ server.stat_numcommands++;
+}
+
/* If this function gets called we already read a whole
* command, argments are in the client argv/argc fields.
* processCommand() execute the command or prepare the
* if 0 is returned the client was destroied (i.e. after QUIT). */
static int processCommand(redisClient *c) {
struct redisCommand *cmd;
- long long dirty;
/* Free some memory if needed (maxmemory setting) */
if (server.maxmemory) freeMemoryIfNeeded();
}
cmd = lookupCommand(c->argv[0]->ptr);
if (!cmd) {
- addReplySds(c,sdsnew("-ERR unknown command\r\n"));
+ addReplySds(c,
+ sdscatprintf(sdsempty(), "-ERR unknown command '%s'\r\n",
+ (char*)c->argv[0]->ptr));
resetClient(c);
return 1;
} else if ((cmd->arity > 0 && cmd->arity != c->argc) ||
(c->argc < -cmd->arity)) {
- addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
+ addReplySds(c,
+ sdscatprintf(sdsempty(),
+ "-ERR wrong number of arguments for '%s' command\r\n",
+ cmd->name));
resetClient(c);
return 1;
} else if (server.maxmemory && cmd->flags & REDIS_CMD_DENYOOM && zmalloc_used_memory() > server.maxmemory) {
}
/* Exec the command */
- dirty = server.dirty;
- cmd->proc(c);
- if (server.appendonly && server.dirty-dirty)
- feedAppendOnlyFile(cmd,c->db->id,c->argv,c->argc);
- if (server.dirty-dirty && listLength(server.slaves))
- replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc);
- if (listLength(server.monitors))
- replicationFeedSlaves(server.monitors,cmd,c->db->id,c->argv,c->argc);
- server.stat_numcommands++;
+ if (c->flags & REDIS_MULTI && cmd->proc != execCommand) {
+ queueMultiCommand(c,cmd);
+ addReply(c,shared.queued);
+ } else {
+ call(c,cmd);
+ }
/* Prepare the client for the next command */
if (c->flags & REDIS_CLOSE) {
robj *lenobj;
lenobj = createObject(REDIS_STRING,
- sdscatprintf(sdsempty(),"%d\r\n",
- stringObjectLen(argv[j])));
+ sdscatprintf(sdsempty(),"%lu\r\n",
+ (unsigned long) stringObjectLen(argv[j])));
lenobj->refcount = 0;
outv[outc++] = lenobj;
}
static void processInputBuffer(redisClient *c) {
again:
+ /* Before to process the input buffer, make sure the client is not
+ * waitig for a blocking operation such as BLPOP. Note that the first
+ * iteration the client is never blocked, otherwise the processInputBuffer
+ * would not be called at all, but after the execution of the first commands
+ * in the input buffer the client may be blocked, and the "goto again"
+ * will try to reiterate. The following line will make it return asap. */
+ if (c->flags & REDIS_BLOCKED) return;
if (c->bulklen == -1) {
/* Read the first line of the query */
char *p = strchr(c->querybuf,'\n');
sdsupdatelen(query);
/* Now we can split the query in arguments */
- if (sdslen(query) == 0) {
- /* Ignore empty query */
- sdsfree(query);
- return;
- }
argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
sdsfree(query);
}
}
zfree(argv);
- /* Execute the command. If the client is still valid
- * after processCommand() return and there is something
- * on the query buffer try to process the next command. */
- if (c->argc && processCommand(c) && sdslen(c->querybuf)) goto again;
+ if (c->argc) {
+ /* Execute the command. If the client is still valid
+ * after processCommand() return and there is something
+ * on the query buffer try to process the next command. */
+ if (processCommand(c) && sdslen(c->querybuf)) goto again;
+ } else {
+ /* Nothing to process, argc == 0. Just process the query
+ * buffer if it's not empty or return to the caller */
+ if (sdslen(c->querybuf)) goto again;
+ }
return;
} else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) {
redisLog(REDIS_DEBUG, "Client protocol error");
c->authenticated = 0;
c->replstate = REDIS_REPL_NONE;
c->reply = listCreate();
+ c->blockingkeys = NULL;
+ c->blockingkeysnum = 0;
listSetFreeMethod(c->reply,decrRefCount);
listSetDupMethod(c->reply,dupClientReplyValue);
if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
- readQueryFromClient, c, NULL) == AE_ERR) {
+ readQueryFromClient, c) == AE_ERR) {
freeClient(c);
return NULL;
}
listAddNodeTail(server.clients,c);
+ initClientMultiState(c);
return c;
}
(c->replstate == REDIS_REPL_NONE ||
c->replstate == REDIS_REPL_ONLINE) &&
aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
- sendReplyToClient, c, NULL) == AE_ERR) return;
- if (obj->encoding != REDIS_ENCODING_RAW) {
- obj = getDecodedObject(obj);
- } else {
- incrRefCount(obj);
- }
- listAddNodeTail(c->reply,obj);
+ sendReplyToClient, c) == AE_ERR) return;
+ listAddNodeTail(c->reply,getDecodedObject(obj));
}
static void addReplySds(redisClient *c, sds s) {
decrRefCount(o);
}
+static void addReplyDouble(redisClient *c, double d) {
+ char buf[128];
+
+ snprintf(buf,sizeof(buf),"%.17g",d);
+ addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n%s\r\n",
+ (unsigned long) strlen(buf),buf));
+}
+
static void addReplyBulkLen(redisClient *c, robj *obj) {
size_t len;
} else {
long n = (long)obj->ptr;
+ /* Compute how many bytes will take this integer as a radix 10 string */
len = 1;
if (n < 0) {
len++;
len++;
}
}
- addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",len));
+ addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",(unsigned long)len));
}
static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
char *err = "-ERR max number of clients reached\r\n";
/* That's a best effort error message, don't check write errors */
- (void) write(c->fd,err,strlen(err));
+ if (write(c->fd,err,strlen(err)) == -1) {
+ /* Nothing to do, Just to avoid the warning... */
+ }
freeClient(c);
return;
}
o = listNodeValue(head);
listDelNode(server.objfreelist,head);
} else {
- o = zmalloc(sizeof(*o));
+ if (server.vm_enabled) {
+ o = zmalloc(sizeof(*o));
+ } else {
+ o = zmalloc(sizeof(*o)-sizeof(struct redisObjectVM));
+ }
}
o->type = type;
o->encoding = REDIS_ENCODING_RAW;
o->ptr = ptr;
o->refcount = 1;
+ if (server.vm_enabled) {
+ o->vm.atime = server.unixtime;
+ o->storage = REDIS_VM_MEMORY;
+ }
return o;
}
}
static void incrRefCount(robj *o) {
+ assert(!server.vm_enabled || o->storage == REDIS_VM_MEMORY);
o->refcount++;
-#ifdef DEBUG_REFCOUNT
- if (o->type == REDIS_STRING)
- printf("Increment '%s'(%p), now is: %d\n",o->ptr,o,o->refcount);
-#endif
}
static void decrRefCount(void *obj) {
robj *o = obj;
-#ifdef DEBUG_REFCOUNT
- if (o->type == REDIS_STRING)
- printf("Decrement '%s'(%p), now is: %d\n",o->ptr,o,o->refcount-1);
-#endif
+ /* REDIS_VM_SWAPPED */
+ if (server.vm_enabled && o->storage == REDIS_VM_SWAPPED) {
+ assert(o->refcount == 1);
+ assert(o->type == REDIS_STRING);
+ freeStringObject(o);
+ vmMarkPagesFree(o->vm.page,o->vm.usedpages);
+ if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
+ !listAddNodeHead(server.objfreelist,o))
+ zfree(o);
+ return;
+ }
+ /* REDIS_VM_MEMORY */
if (--(o->refcount) == 0) {
switch(o->type) {
case REDIS_STRING: freeStringObject(o); break;
case REDIS_SET: freeSetObject(o); break;
case REDIS_ZSET: freeZsetObject(o); break;
case REDIS_HASH: freeHashObject(o); break;
- default: assert(0 != 0); break;
+ default: redisAssert(0 != 0); break;
}
if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
!listAddNodeHead(server.objfreelist,o))
static robj *lookupKey(redisDb *db, robj *key) {
dictEntry *de = dictFind(db->dict,key);
- return de ? dictGetEntryVal(de) : NULL;
+ if (de) {
+ robj *key = dictGetEntryKey(de);
+ robj *val = dictGetEntryVal(de);
+
+ if (server.vm_enabled) {
+ if (key->storage == REDIS_VM_MEMORY) {
+ /* Update the access time of the key for the aging algorithm. */
+ key->vm.atime = server.unixtime;
+ } else {
+ /* Our value was swapped on disk. Bring it at home. */
+ assert(val == NULL);
+ val = vmLoadObject(key);
+ dictGetEntryVal(de) = val;
+ }
+ }
+ return val;
+ } else {
+ return NULL;
+ }
}
static robj *lookupKeyRead(redisDb *db, robj *key) {
if (o == NULL || server.shareobjects == 0) return o;
- assert(o->type == REDIS_STRING);
+ redisAssert(o->type == REDIS_STRING);
de = dictFind(server.sharingpool,o);
if (de) {
robj *shared = dictGetEntryKey(de);
if (dictSize(server.sharingpool) >=
server.sharingpoolsize) {
de = dictGetRandomKey(server.sharingpool);
- assert(de != NULL);
+ redisAssert(de != NULL);
c = ((unsigned long) dictGetEntryVal(de))-1;
dictGetEntryVal(de) = (void*) c;
if (c == 0) {
int retval;
retval = dictAdd(server.sharingpool,o,(void*)1);
- assert(retval == DICT_OK);
+ redisAssert(retval == DICT_OK);
incrRefCount(o);
}
return o;
if (o->refcount > 1) return REDIS_ERR;
/* Currently we try to encode only strings */
- assert(o->type == REDIS_STRING);
+ redisAssert(o->type == REDIS_STRING);
/* Check if we can represent this string as a long integer */
if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return REDIS_ERR;
return REDIS_OK;
}
-/* Get a decoded version of an encoded object (returned as a new object) */
-static robj *getDecodedObject(const robj *o) {
+/* Get a decoded version of an encoded object (returned as a new object).
+ * If the object is already raw-encoded just increment the ref count. */
+static robj *getDecodedObject(robj *o) {
robj *dec;
- assert(o->encoding != REDIS_ENCODING_RAW);
+ if (o->encoding == REDIS_ENCODING_RAW) {
+ incrRefCount(o);
+ return o;
+ }
if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
char buf[32];
dec = createStringObject(buf,strlen(buf));
return dec;
} else {
- assert(1 != 1);
+ redisAssert(1 != 1);
}
}
/* Compare two string objects via strcmp() or alike.
* Note that the objects may be integer-encoded. In such a case we
* use snprintf() to get a string representation of the numbers on the stack
- * and compare the strings, it's much faster than calling getDecodedObject(). */
+ * and compare the strings, it's much faster than calling getDecodedObject().
+ *
+ * Important note: if objects are not integer encoded, but binary-safe strings,
+ * sdscmp() from sds.c will apply memcmp() so this function ca be considered
+ * binary safe. */
static int compareStringObjects(robj *a, robj *b) {
- assert(a->type == REDIS_STRING && b->type == REDIS_STRING);
+ redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
char bufa[128], bufb[128], *astr, *bstr;
int bothsds = 1;
}
static size_t stringObjectLen(robj *o) {
- assert(o->type == REDIS_STRING);
+ redisAssert(o->type == REDIS_STRING);
if (o->encoding == REDIS_ENCODING_RAW) {
return sdslen(o->ptr);
} else {
}
}
-/*============================ DB saving/loading ============================ */
+/*============================ RDB saving/loading =========================== */
static int rdbSaveType(FILE *fp, unsigned char type) {
if (fwrite(&type,1,1,fp) == 0) return -1;
/* Try LZF compression - under 20 bytes it's unable to compress even
* aaaaaaaaaaaaaaaaaa so skip it */
- if (len > 20) {
+ if (server.rdbcompression && len > 20) {
int retval;
retval = rdbSaveLzfStringObject(fp,obj);
/* Like rdbSaveStringObjectRaw() but handle encoded objects */
static int rdbSaveStringObject(FILE *fp, robj *obj) {
int retval;
- robj *dec;
- if (obj->encoding != REDIS_ENCODING_RAW) {
- dec = getDecodedObject(obj);
- retval = rdbSaveStringObjectRaw(fp,dec);
- decrRefCount(dec);
- return retval;
- } else {
- return rdbSaveStringObjectRaw(fp,obj);
- }
+ obj = getDecodedObject(obj);
+ retval = rdbSaveStringObjectRaw(fp,obj);
+ decrRefCount(obj);
+ return retval;
}
/* Save a double value. Doubles are saved as strings prefixed by an unsigned
buf[0] = (val < 0) ? 255 : 254;
} else {
snprintf((char*)buf+1,sizeof(buf)-1,"%.17g",val);
- buf[0] = strlen((char*)buf);
+ buf[0] = strlen((char*)buf+1);
len = buf[0]+1;
}
if (fwrite(buf,len,1,fp) == 0) return -1;
return 0;
}
+/* Save a Redis object. */
+static int rdbSaveObject(FILE *fp, robj *o) {
+ if (o->type == REDIS_STRING) {
+ /* Save a string value */
+ if (rdbSaveStringObject(fp,o) == -1) return -1;
+ } else if (o->type == REDIS_LIST) {
+ /* Save a list value */
+ list *list = o->ptr;
+ listNode *ln;
+
+ listRewind(list);
+ if (rdbSaveLen(fp,listLength(list)) == -1) return -1;
+ while((ln = listYield(list))) {
+ robj *eleobj = listNodeValue(ln);
+
+ if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
+ }
+ } else if (o->type == REDIS_SET) {
+ /* Save a set value */
+ dict *set = o->ptr;
+ dictIterator *di = dictGetIterator(set);
+ dictEntry *de;
+
+ if (rdbSaveLen(fp,dictSize(set)) == -1) return -1;
+ while((de = dictNext(di)) != NULL) {
+ robj *eleobj = dictGetEntryKey(de);
+
+ if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
+ }
+ dictReleaseIterator(di);
+ } else if (o->type == REDIS_ZSET) {
+ /* Save a set value */
+ zset *zs = o->ptr;
+ dictIterator *di = dictGetIterator(zs->dict);
+ dictEntry *de;
+
+ if (rdbSaveLen(fp,dictSize(zs->dict)) == -1) return -1;
+ while((de = dictNext(di)) != NULL) {
+ robj *eleobj = dictGetEntryKey(de);
+ double *score = dictGetEntryVal(de);
+
+ if (rdbSaveStringObject(fp,eleobj) == -1) return -1;
+ if (rdbSaveDoubleValue(fp,*score) == -1) return -1;
+ }
+ dictReleaseIterator(di);
+ } else {
+ redisAssert(0 != 0);
+ }
+ return 0;
+}
+
+/* Return the length the object will have on disk if saved with
+ * the rdbSaveObject() function. Currently we use a trick to get
+ * this length with very little changes to the code. In the future
+ * we could switch to a faster solution. */
+static off_t rdbSavedObjectLen(robj *o) {
+ static FILE *fp = NULL;
+
+ if (fp == NULL) fp = fopen("/dev/null","w");
+ assert(fp != NULL);
+
+ rewind(fp);
+ assert(rdbSaveObject(fp,o) != 1);
+ return ftello(fp);
+}
+
+/* Return the number of pages required to save this object in the swap file */
+static off_t rdbSavedObjectPages(robj *o) {
+ off_t bytes = rdbSavedObjectLen(o);
+
+ return (bytes+(server.vm_page_size-1))/server.vm_page_size;
+}
+
/* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */
static int rdbSave(char *filename) {
dictIterator *di = NULL;
/* Save the key and associated value */
if (rdbSaveType(fp,o->type) == -1) goto werr;
if (rdbSaveStringObject(fp,key) == -1) goto werr;
- if (o->type == REDIS_STRING) {
- /* Save a string value */
- if (rdbSaveStringObject(fp,o) == -1) goto werr;
- } else if (o->type == REDIS_LIST) {
- /* Save a list value */
- list *list = o->ptr;
- listNode *ln;
-
- listRewind(list);
- if (rdbSaveLen(fp,listLength(list)) == -1) goto werr;
- while((ln = listYield(list))) {
- robj *eleobj = listNodeValue(ln);
-
- if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
- }
- } else if (o->type == REDIS_SET) {
- /* Save a set value */
- dict *set = o->ptr;
- dictIterator *di = dictGetIterator(set);
- dictEntry *de;
-
- if (rdbSaveLen(fp,dictSize(set)) == -1) goto werr;
- while((de = dictNext(di)) != NULL) {
- robj *eleobj = dictGetEntryKey(de);
-
- if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
- }
- dictReleaseIterator(di);
- } else if (o->type == REDIS_ZSET) {
- /* Save a set value */
- zset *zs = o->ptr;
- dictIterator *di = dictGetIterator(zs->dict);
- dictEntry *de;
-
- if (rdbSaveLen(fp,dictSize(zs->dict)) == -1) goto werr;
- while((de = dictNext(di)) != NULL) {
- robj *eleobj = dictGetEntryKey(de);
- double *score = dictGetEntryVal(de);
-
- if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
- if (rdbSaveDoubleValue(fp,*score) == -1) goto werr;
- }
- dictReleaseIterator(di);
- } else {
- assert(0 != 0);
- }
+ /* Save the actual value */
+ if (rdbSaveObject(fp,o) == -1) goto werr;
}
dictReleaseIterator(di);
}
static int rdbSaveBackground(char *filename) {
pid_t childpid;
- if (server.bgsaveinprogress) return REDIS_ERR;
+ if (server.bgsavechildpid != -1) return REDIS_ERR;
if ((childpid = fork()) == 0) {
/* Child */
close(server.fd);
return REDIS_ERR;
}
redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid);
- server.bgsaveinprogress = 1;
server.bgsavechildpid = childpid;
return REDIS_OK;
}
*
* isencoded is set to 1 if the readed length is not actually a length but
* an "encoding type", check the above comments for more info */
-static uint32_t rdbLoadLen(FILE *fp, int rdbver, int *isencoded) {
+static uint32_t rdbLoadLen(FILE *fp, int *isencoded) {
unsigned char buf[2];
uint32_t len;
+ int type;
if (isencoded) *isencoded = 0;
- if (rdbver == 0) {
+ if (fread(buf,1,1,fp) == 0) return REDIS_RDB_LENERR;
+ type = (buf[0]&0xC0)>>6;
+ if (type == REDIS_RDB_6BITLEN) {
+ /* Read a 6 bit len */
+ return buf[0]&0x3F;
+ } else if (type == REDIS_RDB_ENCVAL) {
+ /* Read a 6 bit len encoding type */
+ if (isencoded) *isencoded = 1;
+ return buf[0]&0x3F;
+ } else if (type == REDIS_RDB_14BITLEN) {
+ /* Read a 14 bit len */
+ if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR;
+ return ((buf[0]&0x3F)<<8)|buf[1];
+ } else {
+ /* Read a 32 bit len */
if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
return ntohl(len);
- } else {
- int type;
-
- if (fread(buf,1,1,fp) == 0) return REDIS_RDB_LENERR;
- type = (buf[0]&0xC0)>>6;
- if (type == REDIS_RDB_6BITLEN) {
- /* Read a 6 bit len */
- return buf[0]&0x3F;
- } else if (type == REDIS_RDB_ENCVAL) {
- /* Read a 6 bit len encoding type */
- if (isencoded) *isencoded = 1;
- return buf[0]&0x3F;
- } else if (type == REDIS_RDB_14BITLEN) {
- /* Read a 14 bit len */
- if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR;
- return ((buf[0]&0x3F)<<8)|buf[1];
- } else {
- /* Read a 32 bit len */
- if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
- return ntohl(len);
- }
}
}
val = (int32_t)v;
} else {
val = 0; /* anti-warning */
- assert(0!=0);
+ redisAssert(0!=0);
}
return createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",val));
}
-static robj *rdbLoadLzfStringObject(FILE*fp, int rdbver) {
+static robj *rdbLoadLzfStringObject(FILE*fp) {
unsigned int len, clen;
unsigned char *c = NULL;
sds val = NULL;
- if ((clen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL;
- if ((len = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL;
+ if ((clen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
+ if ((len = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
if ((c = zmalloc(clen)) == NULL) goto err;
if ((val = sdsnewlen(NULL,len)) == NULL) goto err;
if (fread(c,clen,1,fp) == 0) goto err;
return NULL;
}
-static robj *rdbLoadStringObject(FILE*fp, int rdbver) {
+static robj *rdbLoadStringObject(FILE*fp) {
int isencoded;
uint32_t len;
sds val;
- len = rdbLoadLen(fp,rdbver,&isencoded);
+ len = rdbLoadLen(fp,&isencoded);
if (isencoded) {
switch(len) {
case REDIS_RDB_ENC_INT8:
case REDIS_RDB_ENC_INT32:
return tryObjectSharing(rdbLoadIntegerObject(fp,len));
case REDIS_RDB_ENC_LZF:
- return tryObjectSharing(rdbLoadLzfStringObject(fp,rdbver));
+ return tryObjectSharing(rdbLoadLzfStringObject(fp));
default:
- assert(0!=0);
+ redisAssert(0!=0);
}
}
case 253: *val = R_Nan; return 0;
default:
if (fread(buf,len,1,fp) == 0) return -1;
+ buf[len] = '\0';
sscanf(buf, "%lg", val);
return 0;
}
}
+/* Load a Redis object of the specified type from the specified file.
+ * On success a newly allocated object is returned, otherwise NULL. */
+static robj *rdbLoadObject(int type, FILE *fp) {
+ robj *o;
+
+ if (type == REDIS_STRING) {
+ /* Read string value */
+ if ((o = rdbLoadStringObject(fp)) == NULL) return NULL;
+ tryObjectEncoding(o);
+ } else if (type == REDIS_LIST || type == REDIS_SET) {
+ /* Read list/set value */
+ uint32_t listlen;
+
+ if ((listlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
+ o = (type == REDIS_LIST) ? createListObject() : createSetObject();
+ /* Load every single element of the list/set */
+ while(listlen--) {
+ robj *ele;
+
+ if ((ele = rdbLoadStringObject(fp)) == NULL) return NULL;
+ tryObjectEncoding(ele);
+ if (type == REDIS_LIST) {
+ listAddNodeTail((list*)o->ptr,ele);
+ } else {
+ dictAdd((dict*)o->ptr,ele,NULL);
+ }
+ }
+ } else if (type == REDIS_ZSET) {
+ /* Read list/set value */
+ uint32_t zsetlen;
+ zset *zs;
+
+ if ((zsetlen = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR) return NULL;
+ o = createZsetObject();
+ zs = o->ptr;
+ /* Load every single element of the list/set */
+ while(zsetlen--) {
+ robj *ele;
+ double *score = zmalloc(sizeof(double));
+
+ if ((ele = rdbLoadStringObject(fp)) == NULL) return NULL;
+ tryObjectEncoding(ele);
+ if (rdbLoadDoubleValue(fp,score) == -1) return NULL;
+ dictAdd(zs->dict,ele,score);
+ zslInsert(zs->zsl,*score,ele);
+ incrRefCount(ele); /* added to skiplist */
+ }
+ } else {
+ redisAssert(0 != 0);
+ }
+ return o;
+}
+
static int rdbLoad(char *filename) {
FILE *fp;
robj *keyobj = NULL;
return REDIS_ERR;
}
rdbver = atoi(buf+5);
- if (rdbver > 1) {
+ if (rdbver != 1) {
fclose(fp);
redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
return REDIS_ERR;
if (type == REDIS_EOF) break;
/* Handle SELECT DB opcode as a special case */
if (type == REDIS_SELECTDB) {
- if ((dbid = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
+ if ((dbid = rdbLoadLen(fp,NULL)) == REDIS_RDB_LENERR)
goto eoferr;
if (dbid >= (unsigned)server.dbnum) {
redisLog(REDIS_WARNING,"FATAL: Data file was created with a Redis server configured to handle more than %d databases. Exiting\n", server.dbnum);
continue;
}
/* Read key */
- if ((keyobj = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
-
- if (type == REDIS_STRING) {
- /* Read string value */
- if ((o = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
- tryObjectEncoding(o);
- } else if (type == REDIS_LIST || type == REDIS_SET) {
- /* Read list/set value */
- uint32_t listlen;
-
- if ((listlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
- goto eoferr;
- o = (type == REDIS_LIST) ? createListObject() : createSetObject();
- /* Load every single element of the list/set */
- while(listlen--) {
- robj *ele;
-
- if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
- tryObjectEncoding(ele);
- if (type == REDIS_LIST) {
- listAddNodeTail((list*)o->ptr,ele);
- } else {
- dictAdd((dict*)o->ptr,ele,NULL);
- }
- }
- } else if (type == REDIS_ZSET) {
- /* Read list/set value */
- uint32_t zsetlen;
- zset *zs;
-
- if ((zsetlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
- goto eoferr;
- o = createZsetObject();
- zs = o->ptr;
- /* Load every single element of the list/set */
- while(zsetlen--) {
- robj *ele;
- double *score = zmalloc(sizeof(double));
-
- if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
- tryObjectEncoding(ele);
- if (rdbLoadDoubleValue(fp,score) == -1) goto eoferr;
- dictAdd(zs->dict,ele,score);
- zslInsert(zs->zsl,*score,ele);
- incrRefCount(ele); /* added to skiplist */
- }
- } else {
- assert(0 != 0);
- }
+ if ((keyobj = rdbLoadStringObject(fp)) == NULL) goto eoferr;
+ /* Read value */
+ if ((o = rdbLoadObject(type,fp)) == NULL) goto eoferr;
/* Add the new object in the hash table */
retval = dictAdd(d,keyobj,o);
if (retval == DICT_ERR) {
static void setGenericCommand(redisClient *c, int nx) {
int retval;
+ if (nx) deleteIfVolatile(c->db,c->argv[1]);
retval = dictAdd(c->db->dict,c->argv[1],c->argv[2]);
if (retval == DICT_ERR) {
if (!nx) {
setGenericCommand(c,1);
}
-static void getCommand(redisClient *c) {
+static int getGenericCommand(redisClient *c) {
robj *o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
addReply(c,shared.nullbulk);
+ return REDIS_OK;
} else {
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
+ return REDIS_ERR;
} else {
addReplyBulkLen(c,o);
addReply(c,o);
addReply(c,shared.crlf);
+ return REDIS_OK;
}
}
}
+static void getCommand(redisClient *c) {
+ getGenericCommand(c);
+}
+
static void getsetCommand(redisClient *c) {
- getCommand(c);
+ if (getGenericCommand(c) == REDIS_ERR) return;
if (dictAdd(c->db->dict,c->argv[1],c->argv[2]) == DICT_ERR) {
dictReplace(c->db->dict,c->argv[1],c->argv[2]);
} else {
}
}
+static void msetGenericCommand(redisClient *c, int nx) {
+ int j, busykeys = 0;
+
+ if ((c->argc % 2) == 0) {
+ addReplySds(c,sdsnew("-ERR wrong number of arguments for MSET\r\n"));
+ return;
+ }
+ /* Handle the NX flag. The MSETNX semantic is to return zero and don't
+ * set nothing at all if at least one already key exists. */
+ if (nx) {
+ for (j = 1; j < c->argc; j += 2) {
+ if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
+ busykeys++;
+ }
+ }
+ }
+ if (busykeys) {
+ addReply(c, shared.czero);
+ return;
+ }
+
+ for (j = 1; j < c->argc; j += 2) {
+ int retval;
+
+ tryObjectEncoding(c->argv[j+1]);
+ retval = dictAdd(c->db->dict,c->argv[j],c->argv[j+1]);
+ if (retval == DICT_ERR) {
+ dictReplace(c->db->dict,c->argv[j],c->argv[j+1]);
+ incrRefCount(c->argv[j+1]);
+ } else {
+ incrRefCount(c->argv[j]);
+ incrRefCount(c->argv[j+1]);
+ }
+ removeExpire(c->db,c->argv[j]);
+ }
+ server.dirty += (c->argc-1)/2;
+ addReply(c, nx ? shared.cone : shared.ok);
+}
+
+static void msetCommand(redisClient *c) {
+ msetGenericCommand(c,0);
+}
+
+static void msetnxCommand(redisClient *c) {
+ msetGenericCommand(c,1);
+}
+
static void incrDecrCommand(redisClient *c, long long incr) {
long long value;
int retval;
else if (o->encoding == REDIS_ENCODING_INT)
value = (long)o->ptr;
else
- assert(1 != 1);
+ redisAssert(1 != 1);
}
}
dictEntry *de;
sds pattern = c->argv[1]->ptr;
int plen = sdslen(pattern);
- int numkeys = 0, keyslen = 0;
+ unsigned long numkeys = 0, keyslen = 0;
robj *lenobj = createObject(REDIS_STRING,NULL);
di = dictGetIterator(c->db->dict);
}
static void saveCommand(redisClient *c) {
- if (server.bgsaveinprogress) {
+ if (server.bgsavechildpid != -1) {
addReplySds(c,sdsnew("-ERR background save in progress\r\n"));
return;
}
}
static void bgsaveCommand(redisClient *c) {
- if (server.bgsaveinprogress) {
+ if (server.bgsavechildpid != -1) {
addReplySds(c,sdsnew("-ERR background save already in progress\r\n"));
return;
}
if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
- addReply(c,shared.ok);
+ char *status = "+Background saving started\r\n";
+ addReplySds(c,sdsnew(status));
} else {
addReply(c,shared.err);
}
/* Kill the saving child if there is a background saving in progress.
We want to avoid race conditions, for instance our saving child may
overwrite the synchronous saving did by SHUTDOWN. */
- if (server.bgsaveinprogress) {
+ if (server.bgsavechildpid != -1) {
redisLog(REDIS_WARNING,"There is a live saving child. Killing it!");
kill(server.bgsavechildpid,SIGKILL);
rdbRemoveTempFile(server.bgsavechildpid);
}
- /* SYNC SAVE */
- if (rdbSave(server.dbfilename) == REDIS_OK) {
- if (server.daemonize)
- unlink(server.pidfile);
- redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
- redisLog(REDIS_WARNING,"Server exit now, bye bye...");
- exit(1);
+ if (server.appendonly) {
+ /* Append only file: fsync() the AOF and exit */
+ fsync(server.appendfd);
+ exit(0);
} else {
- /* Ooops.. error saving! The best we can do is to continue operating.
- * Note that if there was a background saving process, in the next
- * cron() Redis will be notified that the background saving aborted,
- * handling special stuff like slaves pending for synchronization... */
- redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit");
- addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n"));
+ /* Snapshotting. Perform a SYNC SAVE and exit */
+ if (rdbSave(server.dbfilename) == REDIS_OK) {
+ if (server.daemonize)
+ unlink(server.pidfile);
+ redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
+ redisLog(REDIS_WARNING,"Server exit now, bye bye...");
+ exit(0);
+ } else {
+ /* Ooops.. error saving! The best we can do is to continue operating.
+ * Note that if there was a background saving process, in the next
+ * cron() Redis will be notified that the background saving aborted,
+ * handling special stuff like slaves pending for synchronization... */
+ redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit");
+ addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n"));
+ }
}
}
lobj = lookupKeyWrite(c->db,c->argv[1]);
if (lobj == NULL) {
+ if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) {
+ addReply(c,shared.ok);
+ return;
+ }
lobj = createListObject();
list = lobj->ptr;
if (where == REDIS_HEAD) {
addReply(c,shared.wrongtypeerr);
return;
}
+ if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) {
+ addReply(c,shared.ok);
+ return;
+ }
list = lobj->ptr;
if (where == REDIS_HEAD) {
listAddNodeHead(list,c->argv[2]);
o = lookupKeyWrite(c->db,c->argv[1]);
if (o == NULL) {
- addReply(c,shared.nokeyerr);
+ addReply(c,shared.ok);
} else {
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
}
}
+/* This is the semantic of this command:
+ * RPOPLPUSH srclist dstlist:
+ * IF LLEN(srclist) > 0
+ * element = RPOP srclist
+ * LPUSH dstlist element
+ * RETURN element
+ * ELSE
+ * RETURN nil
+ * END
+ * END
+ *
+ * The idea is to be able to get an element from a list in a reliable way
+ * since the element is not just returned but pushed against another list
+ * as well. This command was originally proposed by Ezra Zygmuntowicz.
+ */
+static void rpoplpushcommand(redisClient *c) {
+ robj *sobj;
+
+ sobj = lookupKeyWrite(c->db,c->argv[1]);
+ if (sobj == NULL) {
+ addReply(c,shared.nullbulk);
+ } else {
+ if (sobj->type != REDIS_LIST) {
+ addReply(c,shared.wrongtypeerr);
+ } else {
+ list *srclist = sobj->ptr;
+ listNode *ln = listLast(srclist);
+
+ if (ln == NULL) {
+ addReply(c,shared.nullbulk);
+ } else {
+ robj *dobj = lookupKeyWrite(c->db,c->argv[2]);
+ robj *ele = listNodeValue(ln);
+ list *dstlist;
+
+ if (dobj && dobj->type != REDIS_LIST) {
+ addReply(c,shared.wrongtypeerr);
+ return;
+ }
+
+ /* Add the element to the target list (unless it's directly
+ * passed to some BLPOP-ing client */
+ if (!handleClientsWaitingListPush(c,c->argv[2],ele)) {
+ if (dobj == NULL) {
+ /* Create the list if the key does not exist */
+ dobj = createListObject();
+ dictAdd(c->db->dict,c->argv[2],dobj);
+ incrRefCount(c->argv[2]);
+ }
+ dstlist = dobj->ptr;
+ listAddNodeHead(dstlist,ele);
+ incrRefCount(ele);
+ }
+
+ /* Send the element to the client as reply as well */
+ addReplyBulkLen(c,ele);
+ addReply(c,ele);
+ addReply(c,shared.crlf);
+
+ /* Finally remove the element from the source list */
+ listDelNode(srclist,ln);
+ server.dirty++;
+ }
+ }
+ }
+}
+
+
/* ==================================== Sets ================================ */
static void saddCommand(redisClient *c) {
addReply(c,shared.wrongtypeerr);
} else {
s = o->ptr;
- addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
+ addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
dictSize(s)));
}
}
return dictSize(*d1)-dictSize(*d2);
}
-static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey) {
+static void sinterGenericCommand(redisClient *c, robj **setskeys, unsigned long setsnum, robj *dstkey) {
dict **dv = zmalloc(sizeof(dict*)*setsnum);
dictIterator *di;
dictEntry *de;
robj *lenobj = NULL, *dstset = NULL;
- int j, cardinality = 0;
+ unsigned long j, cardinality = 0;
for (j = 0; j < setsnum; j++) {
robj *setobj;
if (!setobj) {
zfree(dv);
if (dstkey) {
- deleteKey(c->db,dstkey);
- addReply(c,shared.ok);
+ if (deleteKey(c->db,dstkey))
+ server.dirty++;
+ addReply(c,shared.czero);
} else {
addReply(c,shared.nullmultibulk);
}
}
if (!dstkey) {
- lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
+ lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",cardinality);
} else {
- addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
+ addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
dictSize((dict*)dstset->ptr)));
server.dirty++;
}
if (!dstkey) {
decrRefCount(dstset);
} else {
- addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
+ addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
dictSize((dict*)dstset->ptr)));
server.dirty++;
}
/* The actual Z-commands implementations */
-static void zaddCommand(redisClient *c) {
+/* This generic command implements both ZADD and ZINCRBY.
+ * scoreval is the score if the operation is a ZADD (doincrement == 0) or
+ * the increment if the operation is a ZINCRBY (doincrement == 1). */
+static void zaddGenericCommand(redisClient *c, robj *key, robj *ele, double scoreval, int doincrement) {
robj *zsetobj;
zset *zs;
double *score;
- zsetobj = lookupKeyWrite(c->db,c->argv[1]);
+ zsetobj = lookupKeyWrite(c->db,key);
if (zsetobj == NULL) {
zsetobj = createZsetObject();
- dictAdd(c->db->dict,c->argv[1],zsetobj);
- incrRefCount(c->argv[1]);
+ dictAdd(c->db->dict,key,zsetobj);
+ incrRefCount(key);
} else {
if (zsetobj->type != REDIS_ZSET) {
addReply(c,shared.wrongtypeerr);
return;
}
}
- score = zmalloc(sizeof(double));
- *score = strtod(c->argv[2]->ptr,NULL);
zs = zsetobj->ptr;
- if (dictAdd(zs->dict,c->argv[3],score) == DICT_OK) {
+
+ /* Ok now since we implement both ZADD and ZINCRBY here the code
+ * needs to handle the two different conditions. It's all about setting
+ * '*score', that is, the new score to set, to the right value. */
+ score = zmalloc(sizeof(double));
+ if (doincrement) {
+ dictEntry *de;
+
+ /* Read the old score. If the element was not present starts from 0 */
+ de = dictFind(zs->dict,ele);
+ if (de) {
+ double *oldscore = dictGetEntryVal(de);
+ *score = *oldscore + scoreval;
+ } else {
+ *score = scoreval;
+ }
+ } else {
+ *score = scoreval;
+ }
+
+ /* What follows is a simple remove and re-insert operation that is common
+ * to both ZADD and ZINCRBY... */
+ if (dictAdd(zs->dict,ele,score) == DICT_OK) {
/* case 1: New element */
- incrRefCount(c->argv[3]); /* added to hash */
- zslInsert(zs->zsl,*score,c->argv[3]);
- incrRefCount(c->argv[3]); /* added to skiplist */
+ incrRefCount(ele); /* added to hash */
+ zslInsert(zs->zsl,*score,ele);
+ incrRefCount(ele); /* added to skiplist */
server.dirty++;
- addReply(c,shared.cone);
+ if (doincrement)
+ addReplyDouble(c,*score);
+ else
+ addReply(c,shared.cone);
} else {
dictEntry *de;
double *oldscore;
/* case 2: Score update operation */
- de = dictFind(zs->dict,c->argv[3]);
- assert(de != NULL);
+ de = dictFind(zs->dict,ele);
+ redisAssert(de != NULL);
oldscore = dictGetEntryVal(de);
if (*score != *oldscore) {
int deleted;
- deleted = zslDelete(zs->zsl,*oldscore,c->argv[3]);
- assert(deleted != 0);
- zslInsert(zs->zsl,*score,c->argv[3]);
- incrRefCount(c->argv[3]);
- dictReplace(zs->dict,c->argv[3],score);
+ /* Remove and insert the element in the skip list with new score */
+ deleted = zslDelete(zs->zsl,*oldscore,ele);
+ redisAssert(deleted != 0);
+ zslInsert(zs->zsl,*score,ele);
+ incrRefCount(ele);
+ /* Update the score in the hash table */
+ dictReplace(zs->dict,ele,score);
server.dirty++;
} else {
zfree(score);
}
- addReply(c,shared.czero);
+ if (doincrement)
+ addReplyDouble(c,*score);
+ else
+ addReply(c,shared.czero);
}
}
+static void zaddCommand(redisClient *c) {
+ double scoreval;
+
+ scoreval = strtod(c->argv[2]->ptr,NULL);
+ zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,0);
+}
+
+static void zincrbyCommand(redisClient *c) {
+ double scoreval;
+
+ scoreval = strtod(c->argv[2]->ptr,NULL);
+ zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,1);
+}
+
static void zremCommand(redisClient *c) {
robj *zsetobj;
zset *zs;
/* Delete from the skiplist */
oldscore = dictGetEntryVal(de);
deleted = zslDelete(zs->zsl,*oldscore,c->argv[2]);
- assert(deleted != 0);
+ redisAssert(deleted != 0);
/* Delete from the hash table */
dictDelete(zs->dict,c->argv[2]);
robj *o;
int start = atoi(c->argv[2]->ptr);
int end = atoi(c->argv[3]->ptr);
+ int withscores = 0;
+
+ if (c->argc == 5 && !strcasecmp(c->argv[4]->ptr,"withscores")) {
+ withscores = 1;
+ } else if (c->argc >= 5) {
+ addReply(c,shared.syntaxerr);
+ return;
+ }
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
ln = ln->forward[0];
}
- addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen));
+ addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",
+ withscores ? (rangelen*2) : rangelen));
for (j = 0; j < rangelen; j++) {
ele = ln->obj;
addReplyBulkLen(c,ele);
addReply(c,ele);
addReply(c,shared.crlf);
+ if (withscores)
+ addReplyDouble(c,ln->score);
ln = reverse ? ln->backward : ln->forward[0];
}
}
robj *o;
double min = strtod(c->argv[2]->ptr,NULL);
double max = strtod(c->argv[3]->ptr,NULL);
+ int offset = 0, limit = -1;
+
+ if (c->argc != 4 && c->argc != 7) {
+ addReplySds(c,
+ sdsnew("-ERR wrong number of arguments for ZRANGEBYSCORE\r\n"));
+ return;
+ } else if (c->argc == 7 && strcasecmp(c->argv[4]->ptr,"limit")) {
+ addReply(c,shared.syntaxerr);
+ return;
+ } else if (c->argc == 7) {
+ offset = atoi(c->argv[5]->ptr);
+ limit = atoi(c->argv[6]->ptr);
+ if (offset < 0) offset = 0;
+ }
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
* it later */
lenobj = createObject(REDIS_STRING,NULL);
addReply(c,lenobj);
+ decrRefCount(lenobj);
while(ln && ln->score <= max) {
+ if (offset) {
+ offset--;
+ ln = ln->forward[0];
+ continue;
+ }
+ if (limit == 0) break;
ele = ln->obj;
addReplyBulkLen(c,ele);
addReply(c,ele);
addReply(c,shared.crlf);
ln = ln->forward[0];
rangelen++;
+ if (limit > 0) limit--;
}
lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",rangelen);
}
addReply(c,shared.wrongtypeerr);
} else {
zs = o->ptr;
- addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",zs->zsl->length));
+ addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",zs->zsl->length));
}
}
}
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
- addReply(c,shared.czero);
+ addReply(c,shared.nullbulk);
return;
} else {
if (o->type != REDIS_ZSET) {
if (!de) {
addReply(c,shared.nullbulk);
} else {
- char buf[128];
double *score = dictGetEntryVal(de);
- snprintf(buf,sizeof(buf),"%.17g",*score);
- addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n%s\r\n",
- strlen(buf),buf));
+ addReplyDouble(c,*score);
}
}
}
char buf[REDIS_SORTKEY_MAX+1];
} keyname;
- if (subst->encoding == REDIS_ENCODING_RAW)
- incrRefCount(subst);
- else {
- subst = getDecodedObject(subst);
+ /* If the pattern is "#" return the substitution object itself in order
+ * to implement the "SORT ... GET #" feature. */
+ spat = pattern->ptr;
+ if (spat[0] == '#' && spat[1] == '\0') {
+ return subst;
}
- spat = pattern->ptr;
+ /* The substitution object may be specially encoded. If so we create
+ * a decoded object on the fly. Otherwise getDecodedObject will just
+ * increment the ref count, that we'll decrement later. */
+ subst = getDecodedObject(subst);
+
ssub = subst->ptr;
if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL;
p = strchr(spat,'*');
- if (!p) return NULL;
+ if (!p) {
+ decrRefCount(subst);
+ return NULL;
+ }
prefixlen = p-spat;
sublen = sdslen(ssub);
keyname.buf[prefixlen+sublen+postfixlen] = '\0';
keyname.len = prefixlen+sublen+postfixlen;
- keyobj.refcount = 1;
- keyobj.type = REDIS_STRING;
- keyobj.ptr = ((char*)&keyname)+(sizeof(long)*2);
-
+ initStaticStringObject(keyobj,((char*)&keyname)+(sizeof(long)*2))
decrRefCount(subst);
/* printf("lookup '%s' => %p\n", keyname.buf,de); */
}
} else {
/* Compare elements directly */
- if (so1->obj->encoding == REDIS_ENCODING_RAW &&
- so2->obj->encoding == REDIS_ENCODING_RAW) {
- cmp = strcoll(so1->obj->ptr,so2->obj->ptr);
- } else {
- robj *dec1, *dec2;
-
- dec1 = so1->obj->encoding == REDIS_ENCODING_RAW ?
- so1->obj : getDecodedObject(so1->obj);
- dec2 = so2->obj->encoding == REDIS_ENCODING_RAW ?
- so2->obj : getDecodedObject(so2->obj);
- cmp = strcoll(dec1->ptr,dec2->ptr);
- if (dec1 != so1->obj) decrRefCount(dec1);
- if (dec2 != so2->obj) decrRefCount(dec2);
- }
+ robj *dec1, *dec2;
+
+ dec1 = getDecodedObject(so1->obj);
+ dec2 = getDecodedObject(so2->obj);
+ cmp = strcoll(dec1->ptr,dec2->ptr);
+ decrRefCount(dec1);
+ decrRefCount(dec2);
}
}
return server.sort_desc ? -cmp : cmp;
/* Lookup the key to sort. It must be of the right types */
sortval = lookupKeyRead(c->db,c->argv[1]);
if (sortval == NULL) {
- addReply(c,shared.nokeyerr);
+ addReply(c,shared.nullmultibulk);
return;
}
- if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST) {
+ if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST &&
+ sortval->type != REDIS_ZSET)
+ {
addReply(c,shared.wrongtypeerr);
return;
}
}
/* Load the sorting vector with all the objects to sort */
- vectorlen = (sortval->type == REDIS_LIST) ?
- listLength((list*)sortval->ptr) :
- dictSize((dict*)sortval->ptr);
+ switch(sortval->type) {
+ case REDIS_LIST: vectorlen = listLength((list*)sortval->ptr); break;
+ case REDIS_SET: vectorlen = dictSize((dict*)sortval->ptr); break;
+ case REDIS_ZSET: vectorlen = dictSize(((zset*)sortval->ptr)->dict); break;
+ default: vectorlen = 0; redisAssert(0); /* Avoid GCC warning */
+ }
vector = zmalloc(sizeof(redisSortObject)*vectorlen);
j = 0;
+
if (sortval->type == REDIS_LIST) {
list *list = sortval->ptr;
listNode *ln;
j++;
}
} else {
- dict *set = sortval->ptr;
+ dict *set;
dictIterator *di;
dictEntry *setele;
+ if (sortval->type == REDIS_SET) {
+ set = sortval->ptr;
+ } else {
+ zset *zs = sortval->ptr;
+ set = zs->dict;
+ }
+
di = dictGetIterator(set);
while((setele = dictNext(di)) != NULL) {
vector[j].obj = dictGetEntryKey(setele);
}
dictReleaseIterator(di);
}
- assert(j == vectorlen);
+ redisAssert(j == vectorlen);
/* Now it's time to load the right scores in the sorting vector */
if (dontsort == 0) {
byval = lookupKeyByPattern(c->db,sortby,vector[j].obj);
if (!byval || byval->type != REDIS_STRING) continue;
if (alpha) {
- if (byval->encoding == REDIS_ENCODING_RAW) {
- vector[j].u.cmpobj = byval;
- incrRefCount(byval);
- } else {
- vector[j].u.cmpobj = getDecodedObject(byval);
- }
+ vector[j].u.cmpobj = getDecodedObject(byval);
} else {
if (byval->encoding == REDIS_ENCODING_RAW) {
vector[j].u.score = strtod(byval->ptr,NULL);
} else {
+ /* Don't need to decode the object if it's
+ * integer-encoded (the only encoding supported) so
+ * far. We can just cast it */
if (byval->encoding == REDIS_ENCODING_INT) {
vector[j].u.score = (long)byval->ptr;
} else
- assert(1 != 1);
+ redisAssert(1 != 1);
}
}
} else {
if (vector[j].obj->encoding == REDIS_ENCODING_INT)
vector[j].u.score = (long) vector[j].obj->ptr;
else
- assert(1 != 1);
+ redisAssert(1 != 1);
}
}
}
addReply(c,shared.crlf);
}
} else {
- assert(sop->type == REDIS_SORT_GET); /* always fails */
+ redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
}
}
}
incrRefCount(val);
}
} else {
- assert(sop->type == REDIS_SORT_GET); /* always fails */
+ redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
}
}
}
- dictReplace(c->db->dict,storekey,listObject);
+ if (dictReplace(c->db->dict,storekey,listObject)) {
+ incrRefCount(storekey);
+ }
/* Note: we add 1 because the DB is dirty anyway since even if the
* SORT result is empty a new key is set and maybe the old content
* replaced. */
zfree(vector);
}
-static void infoCommand(redisClient *c) {
+/* Create the string returned by the INFO command. This is decoupled
+ * by the INFO command itself as we need to report the same information
+ * on memory corruption problems. */
+static sds genRedisInfoString(void) {
sds info;
time_t uptime = time(NULL)-server.stat_starttime;
int j;
info = sdscatprintf(sdsempty(),
"redis_version:%s\r\n"
"arch_bits:%s\r\n"
- "uptime_in_seconds:%d\r\n"
- "uptime_in_days:%d\r\n"
+ "multiplexing_api:%s\r\n"
+ "uptime_in_seconds:%ld\r\n"
+ "uptime_in_days:%ld\r\n"
"connected_clients:%d\r\n"
"connected_slaves:%d\r\n"
+ "blocked_clients:%d\r\n"
"used_memory:%zu\r\n"
"changes_since_last_save:%lld\r\n"
"bgsave_in_progress:%d\r\n"
- "last_save_time:%d\r\n"
+ "last_save_time:%ld\r\n"
+ "bgrewriteaof_in_progress:%d\r\n"
"total_connections_received:%lld\r\n"
"total_commands_processed:%lld\r\n"
"role:%s\r\n"
,REDIS_VERSION,
(sizeof(long) == 8) ? "64" : "32",
+ aeGetApiName(),
uptime,
uptime/(3600*24),
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
+ server.blockedclients,
server.usedmemory,
server.dirty,
- server.bgsaveinprogress,
+ server.bgsavechildpid != -1,
server.lastsave,
+ server.bgrewritechildpid != -1,
server.stat_numconnections,
server.stat_numcommands,
server.masterhost == NULL ? "master" : "slave"
keys = dictSize(server.db[j].dict);
vkeys = dictSize(server.db[j].expires);
if (keys || vkeys) {
- info = sdscatprintf(info, "db%d: keys=%lld,expires=%lld\r\n",
+ info = sdscatprintf(info, "db%d:keys=%lld,expires=%lld\r\n",
j, keys, vkeys);
}
}
- addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(info)));
+ return info;
+}
+
+static void infoCommand(redisClient *c) {
+ sds info = genRedisInfoString();
+ addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",
+ (unsigned long)sdslen(info)));
addReplySds(c,info);
addReply(c,shared.crlf);
}
addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl));
}
-static void msetGenericCommand(redisClient *c, int nx) {
+/* ================================ MULTI/EXEC ============================== */
+
+/* Client state initialization for MULTI/EXEC */
+static void initClientMultiState(redisClient *c) {
+ c->mstate.commands = NULL;
+ c->mstate.count = 0;
+}
+
+/* Release all the resources associated with MULTI/EXEC state */
+static void freeClientMultiState(redisClient *c) {
int j;
- if ((c->argc % 2) == 0) {
- addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
- return;
- }
- /* Handle the NX flag. The MSETNX semantic is to return zero and don't
- * set nothing at all if at least one already key exists. */
- if (nx) {
- for (j = 1; j < c->argc; j += 2) {
- if (dictFind(c->db->dict,c->argv[j]) != NULL) {
- addReply(c, shared.czero);
- return;
- }
- }
+ for (j = 0; j < c->mstate.count; j++) {
+ int i;
+ multiCmd *mc = c->mstate.commands+j;
+
+ for (i = 0; i < mc->argc; i++)
+ decrRefCount(mc->argv[i]);
+ zfree(mc->argv);
}
+ zfree(c->mstate.commands);
+}
- for (j = 1; j < c->argc; j += 2) {
- int retval;
+/* Add a new command into the MULTI commands queue */
+static void queueMultiCommand(redisClient *c, struct redisCommand *cmd) {
+ multiCmd *mc;
+ int j;
- retval = dictAdd(c->db->dict,c->argv[j],c->argv[j+1]);
- if (retval == DICT_ERR) {
- dictReplace(c->db->dict,c->argv[j],c->argv[j+1]);
- incrRefCount(c->argv[j+1]);
- } else {
- incrRefCount(c->argv[j]);
- incrRefCount(c->argv[j+1]);
- }
- removeExpire(c->db,c->argv[j]);
- }
- server.dirty += (c->argc-1)/2;
- addReply(c, nx ? shared.cone : shared.ok);
+ c->mstate.commands = zrealloc(c->mstate.commands,
+ sizeof(multiCmd)*(c->mstate.count+1));
+ mc = c->mstate.commands+c->mstate.count;
+ mc->cmd = cmd;
+ mc->argc = c->argc;
+ mc->argv = zmalloc(sizeof(robj*)*c->argc);
+ memcpy(mc->argv,c->argv,sizeof(robj*)*c->argc);
+ for (j = 0; j < c->argc; j++)
+ incrRefCount(mc->argv[j]);
+ c->mstate.count++;
}
-static void msetCommand(redisClient *c) {
- msetGenericCommand(c,0);
+static void multiCommand(redisClient *c) {
+ c->flags |= REDIS_MULTI;
+ addReply(c,shared.ok);
}
-static void msetnxCommand(redisClient *c) {
- msetGenericCommand(c,1);
+static void execCommand(redisClient *c) {
+ int j;
+ robj **orig_argv;
+ int orig_argc;
+
+ if (!(c->flags & REDIS_MULTI)) {
+ addReplySds(c,sdsnew("-ERR EXEC without MULTI\r\n"));
+ return;
+ }
+
+ orig_argv = c->argv;
+ orig_argc = c->argc;
+ addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->mstate.count));
+ for (j = 0; j < c->mstate.count; j++) {
+ c->argc = c->mstate.commands[j].argc;
+ c->argv = c->mstate.commands[j].argv;
+ call(c,c->mstate.commands[j].cmd);
+ }
+ c->argv = orig_argv;
+ c->argc = orig_argc;
+ freeClientMultiState(c);
+ initClientMultiState(c);
+ c->flags &= (~REDIS_MULTI);
}
-/* =============================== Replication ============================= */
+/* =========================== Blocking Operations ========================= */
-static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
- ssize_t nwritten, ret = size;
- time_t start = time(NULL);
+/* Currently Redis blocking operations support is limited to list POP ops,
+ * so the current implementation is not fully generic, but it is also not
+ * completely specific so it will not require a rewrite to support new
+ * kind of blocking operations in the future.
+ *
+ * Still it's important to note that list blocking operations can be already
+ * used as a notification mechanism in order to implement other blocking
+ * operations at application level, so there must be a very strong evidence
+ * of usefulness and generality before new blocking operations are implemented.
+ *
+ * This is how the current blocking POP works, we use BLPOP as example:
+ * - If the user calls BLPOP and the key exists and contains a non empty list
+ * then LPOP is called instead. So BLPOP is semantically the same as LPOP
+ * if there is not to block.
+ * - If instead BLPOP is called and the key does not exists or the list is
+ * empty we need to block. In order to do so we remove the notification for
+ * new data to read in the client socket (so that we'll not serve new
+ * requests if the blocking request is not served). Also we put the client
+ * in a dictionary (db->blockingkeys) mapping keys to a list of clients
+ * blocking for this keys.
+ * - If a PUSH operation against a key with blocked clients waiting is
+ * performed, we serve the first in the list: basically instead to push
+ * the new element inside the list we return it to the (first / oldest)
+ * blocking client, unblock the client, and remove it form the list.
+ *
+ * The above comment and the source code should be enough in order to understand
+ * the implementation and modify / fix it later.
+ */
- timeout++;
- while(size) {
- if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
- nwritten = write(fd,ptr,size);
- if (nwritten == -1) return -1;
- ptr += nwritten;
- size -= nwritten;
- }
- if ((time(NULL)-start) > timeout) {
- errno = ETIMEDOUT;
- return -1;
+/* Set a client in blocking mode for the specified key, with the specified
+ * timeout */
+static void blockForKeys(redisClient *c, robj **keys, int numkeys, time_t timeout) {
+ dictEntry *de;
+ list *l;
+ int j;
+
+ c->blockingkeys = zmalloc(sizeof(robj*)*numkeys);
+ c->blockingkeysnum = numkeys;
+ c->blockingto = timeout;
+ for (j = 0; j < numkeys; j++) {
+ /* Add the key in the client structure, to map clients -> keys */
+ c->blockingkeys[j] = keys[j];
+ incrRefCount(keys[j]);
+
+ /* And in the other "side", to map keys -> clients */
+ de = dictFind(c->db->blockingkeys,keys[j]);
+ if (de == NULL) {
+ int retval;
+
+ /* For every key we take a list of clients blocked for it */
+ l = listCreate();
+ retval = dictAdd(c->db->blockingkeys,keys[j],l);
+ incrRefCount(keys[j]);
+ assert(retval == DICT_OK);
+ } else {
+ l = dictGetEntryVal(de);
}
+ listAddNodeTail(l,c);
}
- return ret;
+ /* Mark the client as a blocked client */
+ c->flags |= REDIS_BLOCKED;
+ aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
+ server.blockedclients++;
}
-static int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
- ssize_t nread, totread = 0;
- time_t start = time(NULL);
+/* Unblock a client that's waiting in a blocking operation such as BLPOP */
+static void unblockClient(redisClient *c) {
+ dictEntry *de;
+ list *l;
+ int j;
- timeout++;
- while(size) {
- if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
- nread = read(fd,ptr,size);
+ assert(c->blockingkeys != NULL);
+ /* The client may wait for multiple keys, so unblock it for every key. */
+ for (j = 0; j < c->blockingkeysnum; j++) {
+ /* Remove this client from the list of clients waiting for this key. */
+ de = dictFind(c->db->blockingkeys,c->blockingkeys[j]);
+ assert(de != NULL);
+ l = dictGetEntryVal(de);
+ listDelNode(l,listSearchKey(l,c));
+ /* If the list is empty we need to remove it to avoid wasting memory */
+ if (listLength(l) == 0)
+ dictDelete(c->db->blockingkeys,c->blockingkeys[j]);
+ decrRefCount(c->blockingkeys[j]);
+ }
+ /* Cleanup the client structure */
+ zfree(c->blockingkeys);
+ c->blockingkeys = NULL;
+ c->flags &= (~REDIS_BLOCKED);
+ server.blockedclients--;
+ /* Ok now we are ready to get read events from socket, note that we
+ * can't trap errors here as it's possible that unblockClients() is
+ * called from freeClient() itself, and the only thing we can do
+ * if we failed to register the READABLE event is to kill the client.
+ * Still the following function should never fail in the real world as
+ * we are sure the file descriptor is sane, and we exit on out of mem. */
+ aeCreateFileEvent(server.el, c->fd, AE_READABLE, readQueryFromClient, c);
+ /* As a final step we want to process data if there is some command waiting
+ * in the input buffer. Note that this is safe even if unblockClient()
+ * gets called from freeClient() because freeClient() will be smart
+ * enough to call this function *after* c->querybuf was set to NULL. */
+ if (c->querybuf && sdslen(c->querybuf) > 0) processInputBuffer(c);
+}
+
+/* This should be called from any function PUSHing into lists.
+ * 'c' is the "pushing client", 'key' is the key it is pushing data against,
+ * 'ele' is the element pushed.
+ *
+ * If the function returns 0 there was no client waiting for a list push
+ * against this key.
+ *
+ * If the function returns 1 there was a client waiting for a list push
+ * against this key, the element was passed to this client thus it's not
+ * needed to actually add it to the list and the caller should return asap. */
+static int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
+ struct dictEntry *de;
+ redisClient *receiver;
+ list *l;
+ listNode *ln;
+
+ de = dictFind(c->db->blockingkeys,key);
+ if (de == NULL) return 0;
+ l = dictGetEntryVal(de);
+ ln = listFirst(l);
+ assert(ln != NULL);
+ receiver = ln->value;
+
+ addReplySds(receiver,sdsnew("*2\r\n"));
+ addReplyBulkLen(receiver,key);
+ addReply(receiver,key);
+ addReply(receiver,shared.crlf);
+ addReplyBulkLen(receiver,ele);
+ addReply(receiver,ele);
+ addReply(receiver,shared.crlf);
+ unblockClient(receiver);
+ return 1;
+}
+
+/* Blocking RPOP/LPOP */
+static void blockingPopGenericCommand(redisClient *c, int where) {
+ robj *o;
+ time_t timeout;
+ int j;
+
+ for (j = 1; j < c->argc-1; j++) {
+ o = lookupKeyWrite(c->db,c->argv[j]);
+ if (o != NULL) {
+ if (o->type != REDIS_LIST) {
+ addReply(c,shared.wrongtypeerr);
+ return;
+ } else {
+ list *list = o->ptr;
+ if (listLength(list) != 0) {
+ /* If the list contains elements fall back to the usual
+ * non-blocking POP operation */
+ robj *argv[2], **orig_argv;
+ int orig_argc;
+
+ /* We need to alter the command arguments before to call
+ * popGenericCommand() as the command takes a single key. */
+ orig_argv = c->argv;
+ orig_argc = c->argc;
+ argv[1] = c->argv[j];
+ c->argv = argv;
+ c->argc = 2;
+
+ /* Also the return value is different, we need to output
+ * the multi bulk reply header and the key name. The
+ * "real" command will add the last element (the value)
+ * for us. If this souds like an hack to you it's just
+ * because it is... */
+ addReplySds(c,sdsnew("*2\r\n"));
+ addReplyBulkLen(c,argv[1]);
+ addReply(c,argv[1]);
+ addReply(c,shared.crlf);
+ popGenericCommand(c,where);
+
+ /* Fix the client structure with the original stuff */
+ c->argv = orig_argv;
+ c->argc = orig_argc;
+ return;
+ }
+ }
+ }
+ }
+ /* If the list is empty or the key does not exists we must block */
+ timeout = strtol(c->argv[c->argc-1]->ptr,NULL,10);
+ if (timeout > 0) timeout += time(NULL);
+ blockForKeys(c,c->argv+1,c->argc-2,timeout);
+}
+
+static void blpopCommand(redisClient *c) {
+ blockingPopGenericCommand(c,REDIS_HEAD);
+}
+
+static void brpopCommand(redisClient *c) {
+ blockingPopGenericCommand(c,REDIS_TAIL);
+}
+
+/* =============================== Replication ============================= */
+
+static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
+ ssize_t nwritten, ret = size;
+ time_t start = time(NULL);
+
+ timeout++;
+ while(size) {
+ if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
+ nwritten = write(fd,ptr,size);
+ if (nwritten == -1) return -1;
+ ptr += nwritten;
+ size -= nwritten;
+ }
+ if ((time(NULL)-start) > timeout) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ }
+ return ret;
+}
+
+static int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
+ ssize_t nread, totread = 0;
+ time_t start = time(NULL);
+
+ timeout++;
+ while(size) {
+ if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
+ nread = read(fd,ptr,size);
if (nread == -1) return -1;
ptr += nread;
size -= nread;
redisLog(REDIS_NOTICE,"Slave ask for synchronization");
/* Here we need to check if there is a background saving operation
* in progress, or if it is required to start one */
- if (server.bgsaveinprogress) {
+ if (server.bgsavechildpid != -1) {
/* Ok a background save is in progress. Let's check if it is a good
* one for replication, i.e. if there is another slave that is
* registering differences since the server forked to save */
aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE);
slave->replstate = REDIS_REPL_ONLINE;
if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE,
- sendReplyToClient, slave, NULL) == AE_ERR) {
+ sendReplyToClient, slave) == AE_ERR) {
freeClient(slave);
return;
}
slave->repldbsize = buf.st_size;
slave->replstate = REDIS_REPL_SEND_BULK;
aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE);
- if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE, sendBulkToSlave, slave, NULL) == AE_ERR) {
+ if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE, sendBulkToSlave, slave) == AE_ERR) {
freeClient(slave);
continue;
}
}
server.master = createClient(fd);
server.master->flags |= REDIS_MASTER;
+ server.master->authenticated = 1;
server.replstate = REDIS_REPL_CONNECTED;
return REDIS_OK;
}
char seldb[64];
snprintf(seldb,sizeof(seldb),"%d",dictid);
- buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%d\r\n%s\r\n",
- strlen(seldb),seldb);
+ buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%lu\r\n%s\r\n",
+ (unsigned long)strlen(seldb),seldb);
server.appendseldb = dictid;
}
for (j = 0; j < argc; j++) {
robj *o = argv[j];
- if (o->encoding != REDIS_ENCODING_RAW)
- o = getDecodedObject(o);
- buf = sdscatprintf(buf,"$%d\r\n",sdslen(o->ptr));
+ o = getDecodedObject(o);
+ buf = sdscatprintf(buf,"$%lu\r\n",(unsigned long)sdslen(o->ptr));
buf = sdscatlen(buf,o->ptr,sdslen(o->ptr));
buf = sdscatlen(buf,"\r\n",2);
- if (o != argv[j])
- decrRefCount(o);
+ decrRefCount(o);
}
/* Free the objects from the modified argv for EXPIREAT */
}
exit(1);
}
+ /* If a background append only file rewriting is in progress we want to
+ * accumulate the differences between the child DB and the current one
+ * in a buffer, so that when the child process will do its work we
+ * can append the differences to the new append only file. */
+ if (server.bgrewritechildpid != -1)
+ server.bgrewritebuf = sdscatlen(server.bgrewritebuf,buf,sdslen(buf));
+
+ sdsfree(buf);
now = time(NULL);
if (server.appendfsync == APPENDFSYNC_ALWAYS ||
(server.appendfsync == APPENDFSYNC_EVERYSEC &&
if (buf[0] != '$') goto fmterr;
len = strtol(buf+1,NULL,10);
argsds = sdsnewlen(NULL,len);
- if (fread(argsds,len,1,fp) == 0) goto fmterr;
+ if (len && fread(argsds,len,1,fp) == 0) goto fmterr;
argv[j] = createObject(REDIS_STRING,argsds);
if (fread(buf,2,1,fp) == 0) goto fmterr; /* discard CRLF */
}
exit(1);
}
-/* ================================= Debugging ============================== */
+/* Write an object into a file in the bulk format $<count>\r\n<payload>\r\n */
+static int fwriteBulk(FILE *fp, robj *obj) {
+ char buf[128];
+ obj = getDecodedObject(obj);
+ snprintf(buf,sizeof(buf),"$%ld\r\n",(long)sdslen(obj->ptr));
+ if (fwrite(buf,strlen(buf),1,fp) == 0) goto err;
+ if (sdslen(obj->ptr) && fwrite(obj->ptr,sdslen(obj->ptr),1,fp) == 0)
+ goto err;
+ if (fwrite("\r\n",2,1,fp) == 0) goto err;
+ decrRefCount(obj);
+ return 1;
+err:
+ decrRefCount(obj);
+ return 0;
+}
-static void debugCommand(redisClient *c) {
- if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
- *((char*)-1) = 'x';
- } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
- dictEntry *de = dictFind(c->db->dict,c->argv[2]);
- robj *key, *val;
+/* Write a double value in bulk format $<count>\r\n<payload>\r\n */
+static int fwriteBulkDouble(FILE *fp, double d) {
+ char buf[128], dbuf[128];
- if (!de) {
- addReply(c,shared.nokeyerr);
- return;
+ snprintf(dbuf,sizeof(dbuf),"%.17g\r\n",d);
+ snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(dbuf)-2);
+ if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
+ if (fwrite(dbuf,strlen(dbuf),1,fp) == 0) return 0;
+ return 1;
+}
+
+/* Write a long value in bulk format $<count>\r\n<payload>\r\n */
+static int fwriteBulkLong(FILE *fp, long l) {
+ char buf[128], lbuf[128];
+
+ snprintf(lbuf,sizeof(lbuf),"%ld\r\n",l);
+ snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(lbuf)-2);
+ if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
+ if (fwrite(lbuf,strlen(lbuf),1,fp) == 0) return 0;
+ return 1;
+}
+
+/* Write a sequence of commands able to fully rebuild the dataset into
+ * "filename". Used both by REWRITEAOF and BGREWRITEAOF. */
+static int rewriteAppendOnlyFile(char *filename) {
+ dictIterator *di = NULL;
+ dictEntry *de;
+ FILE *fp;
+ char tmpfile[256];
+ int j;
+ time_t now = time(NULL);
+
+ /* Note that we have to use a different temp name here compared to the
+ * one used by rewriteAppendOnlyFileBackground() function. */
+ snprintf(tmpfile,256,"temp-rewriteaof-%d.aof", (int) getpid());
+ fp = fopen(tmpfile,"w");
+ if (!fp) {
+ redisLog(REDIS_WARNING, "Failed rewriting the append only file: %s", strerror(errno));
+ return REDIS_ERR;
+ }
+ for (j = 0; j < server.dbnum; j++) {
+ char selectcmd[] = "*2\r\n$6\r\nSELECT\r\n";
+ redisDb *db = server.db+j;
+ dict *d = db->dict;
+ if (dictSize(d) == 0) continue;
+ di = dictGetIterator(d);
+ if (!di) {
+ fclose(fp);
+ return REDIS_ERR;
+ }
+
+ /* SELECT the new DB */
+ if (fwrite(selectcmd,sizeof(selectcmd)-1,1,fp) == 0) goto werr;
+ if (fwriteBulkLong(fp,j) == 0) goto werr;
+
+ /* Iterate this DB writing every entry */
+ while((de = dictNext(di)) != NULL) {
+ robj *key = dictGetEntryKey(de);
+ robj *o = dictGetEntryVal(de);
+ time_t expiretime = getExpire(db,key);
+
+ /* Save the key and associated value */
+ if (o->type == REDIS_STRING) {
+ /* Emit a SET command */
+ char cmd[]="*3\r\n$3\r\nSET\r\n";
+ if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
+ /* Key and value */
+ if (fwriteBulk(fp,key) == 0) goto werr;
+ if (fwriteBulk(fp,o) == 0) goto werr;
+ } else if (o->type == REDIS_LIST) {
+ /* Emit the RPUSHes needed to rebuild the list */
+ list *list = o->ptr;
+ listNode *ln;
+
+ listRewind(list);
+ while((ln = listYield(list))) {
+ char cmd[]="*3\r\n$5\r\nRPUSH\r\n";
+ robj *eleobj = listNodeValue(ln);
+
+ if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
+ if (fwriteBulk(fp,key) == 0) goto werr;
+ if (fwriteBulk(fp,eleobj) == 0) goto werr;
+ }
+ } else if (o->type == REDIS_SET) {
+ /* Emit the SADDs needed to rebuild the set */
+ dict *set = o->ptr;
+ dictIterator *di = dictGetIterator(set);
+ dictEntry *de;
+
+ while((de = dictNext(di)) != NULL) {
+ char cmd[]="*3\r\n$4\r\nSADD\r\n";
+ robj *eleobj = dictGetEntryKey(de);
+
+ if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
+ if (fwriteBulk(fp,key) == 0) goto werr;
+ if (fwriteBulk(fp,eleobj) == 0) goto werr;
+ }
+ dictReleaseIterator(di);
+ } else if (o->type == REDIS_ZSET) {
+ /* Emit the ZADDs needed to rebuild the sorted set */
+ zset *zs = o->ptr;
+ dictIterator *di = dictGetIterator(zs->dict);
+ dictEntry *de;
+
+ while((de = dictNext(di)) != NULL) {
+ char cmd[]="*4\r\n$4\r\nZADD\r\n";
+ robj *eleobj = dictGetEntryKey(de);
+ double *score = dictGetEntryVal(de);
+
+ if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
+ if (fwriteBulk(fp,key) == 0) goto werr;
+ if (fwriteBulkDouble(fp,*score) == 0) goto werr;
+ if (fwriteBulk(fp,eleobj) == 0) goto werr;
+ }
+ dictReleaseIterator(di);
+ } else {
+ redisAssert(0 != 0);
+ }
+ /* Save the expire time */
+ if (expiretime != -1) {
+ char cmd[]="*3\r\n$8\r\nEXPIREAT\r\n";
+ /* If this key is already expired skip it */
+ if (expiretime < now) continue;
+ if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
+ if (fwriteBulk(fp,key) == 0) goto werr;
+ if (fwriteBulkLong(fp,expiretime) == 0) goto werr;
+ }
+ }
+ dictReleaseIterator(di);
+ }
+
+ /* Make sure data will not remain on the OS's output buffers */
+ fflush(fp);
+ fsync(fileno(fp));
+ fclose(fp);
+
+ /* Use RENAME to make sure the DB file is changed atomically only
+ * if the generate DB file is ok. */
+ if (rename(tmpfile,filename) == -1) {
+ redisLog(REDIS_WARNING,"Error moving temp append only file on the final destination: %s", strerror(errno));
+ unlink(tmpfile);
+ return REDIS_ERR;
+ }
+ redisLog(REDIS_NOTICE,"SYNC append only file rewrite performed");
+ return REDIS_OK;
+
+werr:
+ fclose(fp);
+ unlink(tmpfile);
+ redisLog(REDIS_WARNING,"Write error writing append only file on disk: %s", strerror(errno));
+ if (di) dictReleaseIterator(di);
+ return REDIS_ERR;
+}
+
+/* This is how rewriting of the append only file in background works:
+ *
+ * 1) The user calls BGREWRITEAOF
+ * 2) Redis calls this function, that forks():
+ * 2a) the child rewrite the append only file in a temp file.
+ * 2b) the parent accumulates differences in server.bgrewritebuf.
+ * 3) When the child finished '2a' exists.
+ * 4) The parent will trap the exit code, if it's OK, will append the
+ * data accumulated into server.bgrewritebuf into the temp file, and
+ * finally will rename(2) the temp file in the actual file name.
+ * The the new file is reopened as the new append only file. Profit!
+ */
+static int rewriteAppendOnlyFileBackground(void) {
+ pid_t childpid;
+
+ if (server.bgrewritechildpid != -1) return REDIS_ERR;
+ if ((childpid = fork()) == 0) {
+ /* Child */
+ char tmpfile[256];
+ close(server.fd);
+
+ snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) getpid());
+ if (rewriteAppendOnlyFile(tmpfile) == REDIS_OK) {
+ exit(0);
+ } else {
+ exit(1);
}
- key = dictGetEntryKey(de);
- val = dictGetEntryVal(de);
- addReplySds(c,sdscatprintf(sdsempty(),
- "+Key at:%p refcount:%d, value at:%p refcount:%d encoding:%d\r\n",
- key, key->refcount, val, val->refcount, val->encoding));
} else {
- addReplySds(c,sdsnew(
- "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT <key>]\r\n"));
+ /* Parent */
+ if (childpid == -1) {
+ redisLog(REDIS_WARNING,
+ "Can't rewrite append only file in background: fork: %s",
+ strerror(errno));
+ return REDIS_ERR;
+ }
+ redisLog(REDIS_NOTICE,
+ "Background append only file rewriting started by pid %d",childpid);
+ server.bgrewritechildpid = childpid;
+ /* We set appendseldb to -1 in order to force the next call to the
+ * feedAppendOnlyFile() to issue a SELECT command, so the differences
+ * accumulated by the parent into server.bgrewritebuf will start
+ * with a SELECT statement and it will be safe to merge. */
+ server.appendseldb = -1;
+ return REDIS_OK;
}
+ return REDIS_OK; /* unreached */
}
-#ifdef HAVE_BACKTRACE
-static struct redisFunctionSym symsTable[] = {
-{"compareStringObjects", (unsigned long)compareStringObjects},
-{"isStringRepresentableAsLong", (unsigned long)isStringRepresentableAsLong},
-{"dictEncObjKeyCompare", (unsigned long)dictEncObjKeyCompare},
-{"dictEncObjHash", (unsigned long)dictEncObjHash},
-{"incrDecrCommand", (unsigned long)incrDecrCommand},
-{"freeStringObject", (unsigned long)freeStringObject},
-{"freeListObject", (unsigned long)freeListObject},
-{"freeSetObject", (unsigned long)freeSetObject},
-{"decrRefCount", (unsigned long)decrRefCount},
-{"createObject", (unsigned long)createObject},
-{"freeClient", (unsigned long)freeClient},
-{"rdbLoad", (unsigned long)rdbLoad},
-{"rdbSaveStringObject", (unsigned long)rdbSaveStringObject},
-{"rdbSaveStringObjectRaw", (unsigned long)rdbSaveStringObjectRaw},
-{"addReply", (unsigned long)addReply},
-{"addReplySds", (unsigned long)addReplySds},
-{"incrRefCount", (unsigned long)incrRefCount},
-{"rdbSaveBackground", (unsigned long)rdbSaveBackground},
-{"createStringObject", (unsigned long)createStringObject},
-{"replicationFeedSlaves", (unsigned long)replicationFeedSlaves},
-{"syncWithMaster", (unsigned long)syncWithMaster},
-{"tryObjectSharing", (unsigned long)tryObjectSharing},
-{"tryObjectEncoding", (unsigned long)tryObjectEncoding},
-{"getDecodedObject", (unsigned long)getDecodedObject},
-{"removeExpire", (unsigned long)removeExpire},
-{"expireIfNeeded", (unsigned long)expireIfNeeded},
-{"deleteIfVolatile", (unsigned long)deleteIfVolatile},
-{"deleteKey", (unsigned long)deleteKey},
-{"getExpire", (unsigned long)getExpire},
-{"setExpire", (unsigned long)setExpire},
-{"updateSlavesWaitingBgsave", (unsigned long)updateSlavesWaitingBgsave},
-{"freeMemoryIfNeeded", (unsigned long)freeMemoryIfNeeded},
-{"authCommand", (unsigned long)authCommand},
-{"pingCommand", (unsigned long)pingCommand},
-{"echoCommand", (unsigned long)echoCommand},
-{"setCommand", (unsigned long)setCommand},
-{"setnxCommand", (unsigned long)setnxCommand},
-{"getCommand", (unsigned long)getCommand},
-{"delCommand", (unsigned long)delCommand},
-{"existsCommand", (unsigned long)existsCommand},
-{"incrCommand", (unsigned long)incrCommand},
-{"decrCommand", (unsigned long)decrCommand},
-{"incrbyCommand", (unsigned long)incrbyCommand},
-{"decrbyCommand", (unsigned long)decrbyCommand},
-{"selectCommand", (unsigned long)selectCommand},
-{"randomkeyCommand", (unsigned long)randomkeyCommand},
-{"keysCommand", (unsigned long)keysCommand},
-{"dbsizeCommand", (unsigned long)dbsizeCommand},
-{"lastsaveCommand", (unsigned long)lastsaveCommand},
-{"saveCommand", (unsigned long)saveCommand},
-{"bgsaveCommand", (unsigned long)bgsaveCommand},
-{"shutdownCommand", (unsigned long)shutdownCommand},
-{"moveCommand", (unsigned long)moveCommand},
-{"renameCommand", (unsigned long)renameCommand},
-{"renamenxCommand", (unsigned long)renamenxCommand},
-{"lpushCommand", (unsigned long)lpushCommand},
-{"rpushCommand", (unsigned long)rpushCommand},
-{"lpopCommand", (unsigned long)lpopCommand},
-{"rpopCommand", (unsigned long)rpopCommand},
-{"llenCommand", (unsigned long)llenCommand},
-{"lindexCommand", (unsigned long)lindexCommand},
-{"lrangeCommand", (unsigned long)lrangeCommand},
-{"ltrimCommand", (unsigned long)ltrimCommand},
-{"typeCommand", (unsigned long)typeCommand},
-{"lsetCommand", (unsigned long)lsetCommand},
-{"saddCommand", (unsigned long)saddCommand},
-{"sremCommand", (unsigned long)sremCommand},
-{"smoveCommand", (unsigned long)smoveCommand},
-{"sismemberCommand", (unsigned long)sismemberCommand},
-{"scardCommand", (unsigned long)scardCommand},
-{"spopCommand", (unsigned long)spopCommand},
-{"srandmemberCommand", (unsigned long)srandmemberCommand},
-{"sinterCommand", (unsigned long)sinterCommand},
-{"sinterstoreCommand", (unsigned long)sinterstoreCommand},
-{"sunionCommand", (unsigned long)sunionCommand},
-{"sunionstoreCommand", (unsigned long)sunionstoreCommand},
-{"sdiffCommand", (unsigned long)sdiffCommand},
-{"sdiffstoreCommand", (unsigned long)sdiffstoreCommand},
-{"syncCommand", (unsigned long)syncCommand},
-{"flushdbCommand", (unsigned long)flushdbCommand},
-{"flushallCommand", (unsigned long)flushallCommand},
-{"sortCommand", (unsigned long)sortCommand},
-{"lremCommand", (unsigned long)lremCommand},
-{"infoCommand", (unsigned long)infoCommand},
-{"mgetCommand", (unsigned long)mgetCommand},
-{"monitorCommand", (unsigned long)monitorCommand},
-{"expireCommand", (unsigned long)expireCommand},
-{"expireatCommand", (unsigned long)expireatCommand},
-{"getsetCommand", (unsigned long)getsetCommand},
-{"ttlCommand", (unsigned long)ttlCommand},
-{"slaveofCommand", (unsigned long)slaveofCommand},
-{"debugCommand", (unsigned long)debugCommand},
-{"processCommand", (unsigned long)processCommand},
-{"setupSigSegvAction", (unsigned long)setupSigSegvAction},
-{"readQueryFromClient", (unsigned long)readQueryFromClient},
-{"rdbRemoveTempFile", (unsigned long)rdbRemoveTempFile},
-{"msetGenericCommand", (unsigned long)msetGenericCommand},
-{"msetCommand", (unsigned long)msetCommand},
-{"msetnxCommand", (unsigned long)msetnxCommand},
-{"zslCreateNode", (unsigned long)zslCreateNode},
-{"zslCreate", (unsigned long)zslCreate},
-{"zslFreeNode",(unsigned long)zslFreeNode},
-{"zslFree",(unsigned long)zslFree},
-{"zslRandomLevel",(unsigned long)zslRandomLevel},
-{"zslInsert",(unsigned long)zslInsert},
-{"zslDelete",(unsigned long)zslDelete},
-{"createZsetObject",(unsigned long)createZsetObject},
-{"zaddCommand",(unsigned long)zaddCommand},
-{"zrangeGenericCommand",(unsigned long)zrangeGenericCommand},
-{"zrangeCommand",(unsigned long)zrangeCommand},
-{"zrevrangeCommand",(unsigned long)zrevrangeCommand},
-{"zremCommand",(unsigned long)zremCommand},
-{"rdbSaveDoubleValue",(unsigned long)rdbSaveDoubleValue},
-{"rdbLoadDoubleValue",(unsigned long)rdbLoadDoubleValue},
-{"feedAppendOnlyFile",(unsigned long)feedAppendOnlyFile},
-{NULL,0}
-};
+static void bgrewriteaofCommand(redisClient *c) {
+ if (server.bgrewritechildpid != -1) {
+ addReplySds(c,sdsnew("-ERR background append only file rewriting already in progress\r\n"));
+ return;
+ }
+ if (rewriteAppendOnlyFileBackground() == REDIS_OK) {
+ char *status = "+Background append only file rewriting started\r\n";
+ addReplySds(c,sdsnew(status));
+ } else {
+ addReply(c,shared.err);
+ }
+}
-/* This function try to convert a pointer into a function name. It's used in
- * oreder to provide a backtrace under segmentation fault that's able to
- * display functions declared as static (otherwise the backtrace is useless). */
-static char *findFuncName(void *pointer, unsigned long *offset){
- int i, ret = -1;
- unsigned long off, minoff = 0;
+static void aofRemoveTempFile(pid_t childpid) {
+ char tmpfile[256];
- /* Try to match against the Symbol with the smallest offset */
- for (i=0; symsTable[i].pointer; i++) {
- unsigned long lp = (unsigned long) pointer;
+ snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) childpid);
+ unlink(tmpfile);
+}
- if (lp != (unsigned long)-1 && lp >= symsTable[i].pointer) {
- off=lp-symsTable[i].pointer;
- if (ret < 0 || off < minoff) {
- minoff=off;
- ret=i;
+/* =============================== Virtual Memory =========================== */
+static void vmInit(void) {
+ off_t totsize;
+
+ server.vm_fp = fopen("/tmp/redisvm","w+b");
+ if (server.vm_fp == NULL) {
+ redisLog(REDIS_WARNING,"Impossible to open the swap file. Exiting.");
+ exit(1);
+ }
+ server.vm_fd = fileno(server.vm_fp);
+ server.vm_next_page = 0;
+ server.vm_near_pages = 0;
+ totsize = server.vm_pages*server.vm_page_size;
+ redisLog(REDIS_NOTICE,"Allocating %lld bytes of swap file",totsize);
+ if (ftruncate(server.vm_fd,totsize) == -1) {
+ redisLog(REDIS_WARNING,"Can't ftruncate swap file: %s. Exiting.",
+ strerror(errno));
+ exit(1);
+ } else {
+ redisLog(REDIS_NOTICE,"Swap file allocated with success");
+ }
+ server.vm_bitmap = zmalloc((server.vm_pages+7)/8);
+ memset(server.vm_bitmap,0,(server.vm_pages+7)/8);
+ /* Try to remove the swap file, so the OS will really delete it from the
+ * file system when Redis exists. */
+ unlink("/tmp/redisvm");
+}
+
+/* Mark the page as used */
+static void vmMarkPageUsed(off_t page) {
+ off_t byte = page/8;
+ int bit = page&7;
+ server.vm_bitmap[byte] |= 1<<bit;
+ printf("Mark used: %lld (byte:%d bit:%d)\n", (long long)page, byte, bit);
+}
+
+/* Mark N contiguous pages as used, with 'page' being the first. */
+static void vmMarkPagesUsed(off_t page, off_t count) {
+ off_t j;
+
+ for (j = 0; j < count; j++)
+ vmMarkPageUsed(page+j);
+}
+
+/* Mark the page as free */
+static void vmMarkPageFree(off_t page) {
+ off_t byte = page/8;
+ int bit = page&7;
+ server.vm_bitmap[byte] &= ~(1<<bit);
+}
+
+/* Mark N contiguous pages as free, with 'page' being the first. */
+static void vmMarkPagesFree(off_t page, off_t count) {
+ off_t j;
+
+ for (j = 0; j < count; j++)
+ vmMarkPageFree(page+j);
+}
+
+/* Test if the page is free */
+static int vmFreePage(off_t page) {
+ off_t byte = page/8;
+ int bit = page&7;
+ return (server.vm_bitmap[byte] & (1<<bit)) == 0;
+}
+
+/* Find N contiguous free pages storing the first page of the cluster in *first.
+ * Returns REDIS_OK if it was able to find N contiguous pages, otherwise
+ * REDIS_ERR is returned.
+ *
+ * This function uses a simple algorithm: we try to allocate
+ * REDIS_VM_MAX_NEAR_PAGES sequentially, when we reach this limit we start
+ * again from the start of the swap file searching for free spaces.
+ *
+ * If it looks pretty clear that there are no free pages near our offset
+ * we try to find less populated places doing a forward jump of
+ * REDIS_VM_MAX_RANDOM_JUMP, then we start scanning again a few pages
+ * without hurry, and then we jump again and so forth...
+ *
+ * This function can be improved using a free list to avoid to guess
+ * too much, since we could collect data about freed pages.
+ *
+ * note: I implemented this function just after watching an episode of
+ * Battlestar Galactica, where the hybrid was continuing to say "JUMP!"
+ */
+static int vmFindContiguousPages(off_t *first, int n) {
+ off_t base, offset = 0, since_jump = 0, numfree = 0;
+
+ if (server.vm_near_pages == REDIS_VM_MAX_NEAR_PAGES) {
+ server.vm_near_pages = 0;
+ server.vm_next_page = 0;
+ }
+ server.vm_near_pages++; /* Yet another try for pages near to the old ones */
+ base = server.vm_next_page;
+
+ while(offset < server.vm_pages) {
+ off_t this = base+offset;
+
+ printf("THIS: %lld (%c)\n", (long long) this, vmFreePage(this) ? 'F' : 'X');
+ /* If we overflow, restart from page zero */
+ if (this >= server.vm_pages) {
+ this -= server.vm_pages;
+ if (this == 0) {
+ /* Just overflowed, what we found on tail is no longer
+ * interesting, as it's no longer contiguous. */
+ numfree = 0;
}
}
+ if (vmFreePage(this)) {
+ /* This is a free page */
+ numfree++;
+ /* Already got N free pages? Return to the caller, with success */
+ if (numfree == n) {
+ *first = this-(n-1);
+ server.vm_next_page = this+1;
+ return REDIS_OK;
+ }
+ } else {
+ /* The current one is not a free page */
+ numfree = 0;
+ }
+
+ /* Fast-forward if the current page is not free and we already
+ * searched enough near this place. */
+ since_jump++;
+ if (!numfree && since_jump >= REDIS_VM_MAX_RANDOM_JUMP/4) {
+ offset += random() % REDIS_VM_MAX_RANDOM_JUMP;
+ since_jump = 0;
+ /* Note that even if we rewind after the jump, we are don't need
+ * to make sure numfree is set to zero as we only jump *if* it
+ * is set to zero. */
+ } else {
+ /* Otherwise just check the next page */
+ offset++;
+ }
}
- if (ret == -1) return NULL;
- *offset = minoff;
- return symsTable[ret].name;
+ return REDIS_ERR;
}
-static void *getMcontextEip(ucontext_t *uc) {
-#if defined(__FreeBSD__)
- return (void*) uc->uc_mcontext.mc_eip;
-#elif defined(__dietlibc__)
- return (void*) uc->uc_mcontext.eip;
-#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
- return (void*) uc->uc_mcontext->__ss.__eip;
-#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
- #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
- return (void*) uc->uc_mcontext->__ss.__rip;
- #else
- return (void*) uc->uc_mcontext->__ss.__eip;
- #endif
-#elif defined(__i386__) || defined(__X86_64__) /* Linux x86 */
- return (void*) uc->uc_mcontext.gregs[REG_EIP];
-#elif defined(__ia64__) /* Linux IA64 */
- return (void*) uc->uc_mcontext.sc_ip;
-#else
- return NULL;
-#endif
+/* Swap the 'val' object relative to 'key' into disk. Store all the information
+ * needed to later retrieve the object into the key object.
+ * If we can't find enough contiguous empty pages to swap the object on disk
+ * REDIS_ERR is returned. */
+static int vmSwapObject(robj *key, robj *val) {
+ off_t pages = rdbSavedObjectPages(val);
+ off_t page;
+
+ assert(key->storage == REDIS_VM_MEMORY);
+ if (vmFindContiguousPages(&page,pages) == REDIS_ERR) return REDIS_ERR;
+ if (fseeko(server.vm_fp,page*server.vm_page_size,SEEK_SET) == -1) {
+ redisLog(REDIS_WARNING,
+ "Critical VM problem in vmSwapObject(): can't seek: %s",
+ strerror(errno));
+ return REDIS_ERR;
+ }
+ rdbSaveObject(server.vm_fp,val);
+ key->vm.page = page;
+ key->vm.usedpages = pages;
+ key->storage = REDIS_VM_SWAPPED;
+ decrRefCount(val); /* Deallocate the object from memory. */
+ vmMarkPagesUsed(page,pages);
+ redisLog(REDIS_DEBUG,"VM: object %s swapped out at %lld (%lld pages)",
+ (unsigned char*) key->ptr,
+ (unsigned long long) page, (unsigned long long) pages);
+ return REDIS_OK;
}
-static void segvHandler(int sig, siginfo_t *info, void *secret) {
- void *trace[100];
- char **messages = NULL;
- int i, trace_size = 0;
- unsigned long offset=0;
- time_t uptime = time(NULL)-server.stat_starttime;
- ucontext_t *uc = (ucontext_t*) secret;
- REDIS_NOTUSED(info);
+/* Load the value object relative to the 'key' object from swap to memory.
+ * The newly allocated object is returned. */
+static robj *vmLoadObject(robj *key) {
+ robj *val;
- redisLog(REDIS_WARNING,
- "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig);
- redisLog(REDIS_WARNING, "%s", sdscatprintf(sdsempty(),
- "redis_version:%s; "
- "uptime_in_seconds:%d; "
- "connected_clients:%d; "
- "connected_slaves:%d; "
- "used_memory:%zu; "
- "changes_since_last_save:%lld; "
- "bgsave_in_progress:%d; "
- "last_save_time:%d; "
- "total_connections_received:%lld; "
- "total_commands_processed:%lld; "
- "role:%s;"
- ,REDIS_VERSION,
- uptime,
- listLength(server.clients)-listLength(server.slaves),
- listLength(server.slaves),
- server.usedmemory,
- server.dirty,
- server.bgsaveinprogress,
- server.lastsave,
- server.stat_numconnections,
- server.stat_numcommands,
- server.masterhost == NULL ? "master" : "slave"
- ));
-
- trace_size = backtrace(trace, 100);
- /* overwrite sigaction with caller's address */
- if (getMcontextEip(uc) != NULL) {
- trace[1] = getMcontextEip(uc);
+ assert(key->storage == REDIS_VM_SWAPPED);
+ if (fseeko(server.vm_fp,key->vm.page*server.vm_page_size,SEEK_SET) == -1) {
+ redisLog(REDIS_WARNING,
+ "Unrecoverable VM problem in vmLoadObject(): can't seek: %s",
+ strerror(errno));
+ exit(1);
}
- messages = backtrace_symbols(trace, trace_size);
+ val = rdbLoadObject(key->type,server.vm_fp);
+ if (val == NULL) {
+ redisLog(REDIS_WARNING, "Unrecoverable VM problem in vmLoadObject(): can't load object from swap file: %s", strerror(errno));
+ exit(1);
+ }
+ key->storage = REDIS_VM_MEMORY;
+ key->vm.atime = server.unixtime;
+ vmMarkPagesFree(key->vm.page,key->vm.usedpages);
+ redisLog(REDIS_DEBUG, "VM: object %s loaded from disk",
+ (unsigned char*) key->ptr);
+ return val;
+}
- for (i=1; i<trace_size; ++i) {
- char *fn = findFuncName(trace[i], &offset), *p;
+/* ================================= Debugging ============================== */
- p = strchr(messages[i],'+');
- if (!fn || (p && ((unsigned long)strtol(p+1,NULL,10)) < offset)) {
- redisLog(REDIS_WARNING,"%s", messages[i]);
+static void debugCommand(redisClient *c) {
+ if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
+ *((char*)-1) = 'x';
+ } else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
+ if (rdbSave(server.dbfilename) != REDIS_OK) {
+ addReply(c,shared.err);
+ return;
+ }
+ emptyDb();
+ if (rdbLoad(server.dbfilename) != REDIS_OK) {
+ addReply(c,shared.err);
+ return;
+ }
+ redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"loadaof")) {
+ emptyDb();
+ if (loadAppendOnlyFile(server.appendfilename) != REDIS_OK) {
+ addReply(c,shared.err);
+ return;
+ }
+ redisLog(REDIS_WARNING,"Append Only File loaded by DEBUG LOADAOF");
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
+ dictEntry *de = dictFind(c->db->dict,c->argv[2]);
+ robj *key, *val;
+
+ if (!de) {
+ addReply(c,shared.nokeyerr);
+ return;
+ }
+ key = dictGetEntryKey(de);
+ val = dictGetEntryVal(de);
+ addReplySds(c,sdscatprintf(sdsempty(),
+ "+Key at:%p refcount:%d, value at:%p refcount:%d encoding:%d serializedlength:%lld\r\n",
+ (void*)key, key->refcount, (void*)val, val->refcount,
+ val->encoding, rdbSavedObjectLen(val)));
+ } else if (!strcasecmp(c->argv[1]->ptr,"swapout") && c->argc == 3) {
+ dictEntry *de = dictFind(c->db->dict,c->argv[2]);
+ robj *key, *val;
+
+ if (!server.vm_enabled) {
+ addReplySds(c,sdsnew("-ERR Virtual Memory is disabled\r\n"));
+ return;
+ }
+ if (!de) {
+ addReply(c,shared.nokeyerr);
+ return;
+ }
+ key = dictGetEntryKey(de);
+ val = dictGetEntryVal(de);
+ if (key->storage != REDIS_VM_MEMORY) {
+ addReplySds(c,sdsnew("-ERR This key is not in memory\r\n"));
+ } else if (vmSwapObject(key,val) == REDIS_OK) {
+ dictGetEntryVal(de) = NULL;
+ addReply(c,shared.ok);
} else {
- redisLog(REDIS_WARNING,"%d redis-server %p %s + %d", i, trace[i], fn, (unsigned int)offset);
+ addReply(c,shared.err);
}
+ } else {
+ addReplySds(c,sdsnew(
+ "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT <key>|SWAPOUT <key>|RELOAD]\r\n"));
}
- free(messages);
- exit(0);
}
-static void setupSigSegvAction(void) {
- struct sigaction act;
-
- sigemptyset (&act.sa_mask);
- /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
- * is used. Otherwise, sa_handler is used */
- act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
- act.sa_sigaction = segvHandler;
- sigaction (SIGSEGV, &act, NULL);
- sigaction (SIGBUS, &act, NULL);
- sigaction (SIGFPE, &act, NULL);
- sigaction (SIGILL, &act, NULL);
- sigaction (SIGBUS, &act, NULL);
- return;
-}
-#else /* HAVE_BACKTRACE */
-static void setupSigSegvAction(void) {
+static void _redisAssert(char *estr) {
+ redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
+ redisLog(REDIS_WARNING,"==> %s\n",estr);
+#ifdef HAVE_BACKTRACE
+ redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+ *((char*)-1) = 'x';
+#endif
}
-#endif /* HAVE_BACKTRACE */
/* =================================== Main! ================================ */
FILE *fp;
if (fork() != 0) exit(0); /* parent exits */
+ printf("New pid: %d\n", getpid());
setsid(); /* create a new session */
/* Every output goes to /dev/null. If Redis is daemonized but
int main(int argc, char **argv) {
initServerConfig();
if (argc == 2) {
- ResetServerSaveParams();
+ resetServerSaveParams();
loadServerConfig(argv[1]);
} else if (argc > 2) {
fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf]\n");
} else {
redisLog(REDIS_WARNING,"Warning: no config file specified, using the default config. In order to specify a config file use 'redis-server /path/to/redis.conf'");
}
- initServer();
if (server.daemonize) daemonize();
+ initServer();
redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION);
#ifdef __linux__
linuxOvercommitMemoryWarning();
redisLog(REDIS_NOTICE,"DB loaded from disk");
}
if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,
- acceptHandler, NULL, NULL) == AE_ERR) oom("creating file event");
+ acceptHandler, NULL) == AE_ERR) oom("creating file event");
redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
aeMain(server.el);
aeDeleteEventLoop(server.el);
return 0;
}
+
+/* ============================= Backtrace support ========================= */
+
+#ifdef HAVE_BACKTRACE
+static char *findFuncName(void *pointer, unsigned long *offset);
+
+static void *getMcontextEip(ucontext_t *uc) {
+#if defined(__FreeBSD__)
+ return (void*) uc->uc_mcontext.mc_eip;
+#elif defined(__dietlibc__)
+ return (void*) uc->uc_mcontext.eip;
+#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
+ #if __x86_64__
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #endif
+#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #endif
+#elif defined(__i386__) || defined(__X86_64__) || defined(__x86_64__)
+ return (void*) uc->uc_mcontext.gregs[REG_EIP]; /* Linux 32/64 bit */
+#elif defined(__ia64__) /* Linux IA64 */
+ return (void*) uc->uc_mcontext.sc_ip;
+#else
+ return NULL;
+#endif
+}
+
+static void segvHandler(int sig, siginfo_t *info, void *secret) {
+ void *trace[100];
+ char **messages = NULL;
+ int i, trace_size = 0;
+ unsigned long offset=0;
+ ucontext_t *uc = (ucontext_t*) secret;
+ sds infostring;
+ REDIS_NOTUSED(info);
+
+ redisLog(REDIS_WARNING,
+ "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig);
+ infostring = genRedisInfoString();
+ redisLog(REDIS_WARNING, "%s",infostring);
+ /* It's not safe to sdsfree() the returned string under memory
+ * corruption conditions. Let it leak as we are going to abort */
+
+ trace_size = backtrace(trace, 100);
+ /* overwrite sigaction with caller's address */
+ if (getMcontextEip(uc) != NULL) {
+ trace[1] = getMcontextEip(uc);
+ }
+ messages = backtrace_symbols(trace, trace_size);
+
+ for (i=1; i<trace_size; ++i) {
+ char *fn = findFuncName(trace[i], &offset), *p;
+
+ p = strchr(messages[i],'+');
+ if (!fn || (p && ((unsigned long)strtol(p+1,NULL,10)) < offset)) {
+ redisLog(REDIS_WARNING,"%s", messages[i]);
+ } else {
+ redisLog(REDIS_WARNING,"%d redis-server %p %s + %d", i, trace[i], fn, (unsigned int)offset);
+ }
+ }
+ /* free(messages); Don't call free() with possibly corrupted memory. */
+ exit(0);
+}
+
+static void setupSigSegvAction(void) {
+ struct sigaction act;
+
+ sigemptyset (&act.sa_mask);
+ /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
+ * is used. Otherwise, sa_handler is used */
+ act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
+ act.sa_sigaction = segvHandler;
+ sigaction (SIGSEGV, &act, NULL);
+ sigaction (SIGBUS, &act, NULL);
+ sigaction (SIGFPE, &act, NULL);
+ sigaction (SIGILL, &act, NULL);
+ sigaction (SIGBUS, &act, NULL);
+ return;
+}
+
+#include "staticsymbols.h"
+/* This function try to convert a pointer into a function name. It's used in
+ * oreder to provide a backtrace under segmentation fault that's able to
+ * display functions declared as static (otherwise the backtrace is useless). */
+static char *findFuncName(void *pointer, unsigned long *offset){
+ int i, ret = -1;
+ unsigned long off, minoff = 0;
+
+ /* Try to match against the Symbol with the smallest offset */
+ for (i=0; symsTable[i].pointer; i++) {
+ unsigned long lp = (unsigned long) pointer;
+
+ if (lp != (unsigned long)-1 && lp >= symsTable[i].pointer) {
+ off=lp-symsTable[i].pointer;
+ if (ret < 0 || off < minoff) {
+ minoff=off;
+ ret=i;
+ }
+ }
+ }
+ if (ret == -1) return NULL;
+ *offset = minoff;
+ return symsTable[ret].name;
+}
+#else /* HAVE_BACKTRACE */
+static void setupSigSegvAction(void) {
+}
+#endif /* HAVE_BACKTRACE */
+
+
+
+/* The End */
+
+
+
projects / redis.git / blobdiff