#define REDIS_MASTER 4 /* This client is a master server */
#define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */
-/* Server replication state */
+/* Slave replication state - slave side */
#define REDIS_REPL_NONE 0 /* No active replication */
#define REDIS_REPL_CONNECT 1 /* Must connect to master */
#define REDIS_REPL_CONNECTED 2 /* Connected to master */
+/* Slave replication state - from the point of view of master
+ * Note that in SEND_BULK and ONLINE state the slave receives new updates
+ * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
+ * to start the next background saving in order to send updates to it. */
+#define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
+#define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
+#define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
+#define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
+
/* List related stuff */
#define REDIS_HEAD 0
#define REDIS_TAIL 1
sds querybuf;
robj *argv[REDIS_MAX_ARGS];
int argc;
- int bulklen; /* bulk read len. -1 if not in bulk read mode */
+ int bulklen; /* bulk read len. -1 if not in bulk read mode */
list *reply;
int sentlen;
time_t lastinteraction; /* time of the last interaction, used for timeout */
- int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
- int slaveseldb; /* slave selected db, if this client is a slave */
- int authenticated; /* when requirepass is non-NULL */
+ int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
+ 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 */
+ int repldboff; /* replication DB file offset */
+ off_t repldbsize; /* replication DB file size */
} redisClient;
struct saveparam {
int isslave;
char *masterhost;
int masterport;
- redisClient *master;
+ redisClient *master; /* client that is master for this slave */
int replstate;
/* Sort parameters - qsort_r() is only available under BSD so we
* have to take this state global, in order to pass it to sortCompare() */
static void scardCommand(redisClient *c);
static void sinterCommand(redisClient *c);
static void sinterstoreCommand(redisClient *c);
+static void sunionCommand(redisClient *c);
+static void sunionstoreCommand(redisClient *c);
static void syncCommand(redisClient *c);
static void flushdbCommand(redisClient *c);
static void flushallCommand(redisClient *c);
{"scard",scardCommand,2,REDIS_CMD_INLINE},
{"sinter",sinterCommand,-2,REDIS_CMD_INLINE},
{"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE},
+ {"sunion",sunionCommand,-2,REDIS_CMD_INLINE},
+ {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE},
{"smembers",sinterCommand,2,REDIS_CMD_INLINE},
{"incrby",incrbyCommand,3,REDIS_CMD_INLINE},
{"decrby",decrbyCommand,3,REDIS_CMD_INLINE},
}
outv[outc++] = shared.crlf;
+ /* Increment all the refcounts at start and decrement at end in order to
+ * be sure to free objects if there is no slave in a replication state
+ * able to be feed with commands */
+ for (j = 0; j < outc; j++) incrRefCount(outv[j]);
while(ln) {
redisClient *slave = ln->value;
+
+ /* Don't feed slaves that are still waiting for BGSAVE to start */
+ if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) {
+ ln = ln->next;
+ continue;
+ }
+
+ /* Feed all the other slaves, MONITORs and so on */
if (slave->slaveseldb != dictid) {
robj *selectcmd;
for (j = 0; j < outc; j++) addReply(slave,outv[j]);
ln = ln->next;
}
+ for (j = 0; j < outc; j++) decrRefCount(outv[j]);
}
static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
return REDIS_OK;
}
+static void *dupClientReplyValue(void *o) {
+ incrRefCount((robj*)o);
+ return 0;
+}
+
static redisClient *createClient(int fd) {
redisClient *c = zmalloc(sizeof(*c));
c->flags = 0;
c->lastinteraction = time(NULL);
c->authenticated = 0;
+ c->replstate = REDIS_REPL_NONE;
if ((c->reply = listCreate()) == NULL) oom("listCreate");
listSetFreeMethod(c->reply,decrRefCount);
+ listSetDupMethod(c->reply,dupClientReplyValue);
if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
readQueryFromClient, c, NULL) == AE_ERR) {
freeClient(c);
deleteKey(c->db,dstkey);
dictAdd(c->db->dict,dstkey,dstset);
incrRefCount(dstkey);
- server.dirty++;
}
/* Iterate all the elements of the first (smallest) set, and test
} else {
dictAdd(dstset->ptr,ele,NULL);
incrRefCount(ele);
- server.dirty++;
}
}
dictReleaseIterator(di);
- if (!dstkey)
+ if (!dstkey) {
lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
- else
+ } else {
addReply(c,shared.ok);
+ server.dirty++;
+ }
zfree(dv);
}
sinterGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
}
+static void sunionGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey) {
+ dict **dv = zmalloc(sizeof(dict*)*setsnum);
+ dictIterator *di;
+ dictEntry *de;
+ robj *lenobj = NULL, *dstset = NULL;
+ int j, cardinality = 0;
+
+ if (!dv) oom("sunionCommand");
+ for (j = 0; j < setsnum; j++) {
+ robj *setobj;
+
+ setobj = dstkey ?
+ lookupKeyWrite(c->db,setskeys[j]) :
+ lookupKeyRead(c->db,setskeys[j]);
+ if (!setobj) {
+ dv[j] = NULL;
+ continue;
+ }
+ if (setobj->type != REDIS_SET) {
+ zfree(dv);
+ addReply(c,shared.wrongtypeerr);
+ return;
+ }
+ dv[j] = setobj->ptr;
+ }
+
+ /* We need a temp set object to store our union. If the dstkey
+ * is not NULL (that is, we are inside an SUNIONSTORE operation) then
+ * this set object will be the resulting object to set into the target key*/
+ dstset = createSetObject();
+
+ /* The first thing we should output is the total number of elements...
+ * since this is a multi-bulk write, but at this stage we don't know
+ * the intersection set size, so we use a trick, append an empty object
+ * to the output list and save the pointer to later modify it with the
+ * right length */
+ if (!dstkey) {
+ lenobj = createObject(REDIS_STRING,NULL);
+ addReply(c,lenobj);
+ decrRefCount(lenobj);
+ } else {
+ /* If we have a target key where to store the resulting set
+ * create this key with an empty set inside */
+ deleteKey(c->db,dstkey);
+ dictAdd(c->db->dict,dstkey,dstset);
+ incrRefCount(dstkey);
+ server.dirty++;
+ }
+
+ /* Iterate all the elements of all the sets, add every element a single
+ * time to the result set */
+ for (j = 0; j < setsnum; j++) {
+ if (!dv[j]) continue; /* non existing keys are like empty sets */
+
+ di = dictGetIterator(dv[j]);
+ if (!di) oom("dictGetIterator");
+
+ while((de = dictNext(di)) != NULL) {
+ robj *ele;
+
+ /* dictAdd will not add the same element multiple times */
+ ele = dictGetEntryKey(de);
+ if (dictAdd(dstset->ptr,ele,NULL) == DICT_OK) {
+ incrRefCount(ele);
+ if (!dstkey) {
+ addReplySds(c,sdscatprintf(sdsempty(),
+ "$%d\r\n",sdslen(ele->ptr)));
+ addReply(c,ele);
+ addReply(c,shared.crlf);
+ cardinality++;
+ }
+ }
+ }
+ dictReleaseIterator(di);
+ }
+
+ if (!dstkey) {
+ lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
+ decrRefCount(dstset);
+ } else {
+ addReply(c,shared.ok);
+ server.dirty++;
+ }
+ zfree(dv);
+}
+
+static void sunionCommand(redisClient *c) {
+ sunionGenericCommand(c,c->argv+1,c->argc-1,NULL);
+}
+
+static void sunionstoreCommand(redisClient *c) {
+ sunionGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
+}
+
static void flushdbCommand(redisClient *c) {
dictEmpty(c->db->dict);
dictEmpty(c->db->expires);
}
static void syncCommand(redisClient *c) {
+ /* ignore SYNC if aleady slave or in monitor mode */
+ if (c->flags & REDIS_SLAVE) return;
+
+ /* SYNC can't be issued when the server has pending data to send to
+ * the client about already issued commands. We need a fresh reply
+ * buffer registering the differences between the BGSAVE and the current
+ * dataset, so that we can copy to other slaves if needed. */
+ if (listLength(c->reply) != 0) {
+ addReplySds(c,sdsnew("-ERR SYNC is invalid with pending input\r\n"));
+ return;
+ }
+
+ 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) {
+ /* 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 */
+ redisClient *slave;
+ listNode *ln;
+
+ ln = server.slaves->head;
+ while(ln) {
+ slave = ln->value;
+ if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) break;
+ ln = ln->next;
+ }
+ if (ln) {
+ /* Perfect, the server is already registering differences for
+ * another slave. Set the right state, and copy the buffer. */
+ listRelease(c->reply);
+ c->reply = listDup(slave->reply);
+ if (!c->reply) oom("listDup copying slave reply list");
+ c->replstate = REDIS_REPL_WAIT_BGSAVE_END;
+ redisLog(REDIS_NOTICE,"Waiting for end of BGSAVE for SYNC");
+ } else {
+ /* No way, we need to wait for the next BGSAVE in order to
+ * register differences */
+ c->replstate = REDIS_REPL_WAIT_BGSAVE_START;
+ redisLog(REDIS_NOTICE,"Waiting for next BGSAVE for SYNC");
+ }
+ } else {
+ /* Ok we don't have a BGSAVE in progress, let's start one */
+ redisLog(REDIS_NOTICE,"Starting BGSAVE for SYNC");
+ if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
+ redisLog(REDIS_NOTICE,"Replication failed, can't BGSAVE");
+ addReplySds(c,sdsnew("-ERR Unalbe to perform background save\r\n"));
+ return;
+ }
+ c->replstate = REDIS_REPL_WAIT_BGSAVE_END;
+ }
+ c->flags |= REDIS_SLAVE;
+ c->slaveseldb = 0;
+ if (!listAddNodeTail(server.slaves,c)) oom("listAddNodeTail");
+ redisLog(REDIS_NOTICE,"Synchronization with slave succeeded");
+ return;
+}
+
+#if 0
+static void _syncCommand(redisClient *c) {
struct stat sb;
int fd = -1, len;
time_t start = time(NULL);
/* ignore SYNC if aleady slave or in monitor mode */
if (c->flags & REDIS_SLAVE) return;
- redisLog(REDIS_NOTICE,"Slave ask for syncronization");
+ redisLog(REDIS_NOTICE,"Slave ask for synchronization");
if (flushClientOutput(c) == REDIS_ERR ||
rdbSave(server.dbfilename) != REDIS_OK)
goto closeconn;
c->flags |= REDIS_SLAVE;
c->slaveseldb = 0;
if (!listAddNodeTail(server.slaves,c)) oom("listAddNodeTail");
- redisLog(REDIS_NOTICE,"Syncronization with slave succeeded");
+ redisLog(REDIS_NOTICE,"Synchronization with slave succeeded");
return;
closeconn:
if (fd != -1) close(fd);
c->flags |= REDIS_CLOSE;
- redisLog(REDIS_WARNING,"Syncronization with slave failed");
+ redisLog(REDIS_WARNING,"Synchronization with slave failed");
return;
}
+#endif
static int syncWithMaster(void) {
char buf[1024], tmpfile[256];
projects / redis.git / commitdiff
