#include "redis.h"
-
#include <sys/uio.h>
void *dupClientReplyValue(void *o) {
}
redisClient *createClient(int fd) {
- redisClient *c = zmalloc(sizeof(*c));
+ redisClient *c = zmalloc(sizeof(redisClient));
+ c->bufpos = 0;
+
+ /* passing -1 as fd it is possible to create a non connected client.
+ * This is useful since all the Redis commands needs to be executed
+ * in the context of a client. When commands are executed in other
+ * contexts (for instance a Lua script) we need a non connected client. */
+ if (fd != -1) {
+ anetNonBlock(NULL,fd);
+ anetTcpNoDelay(NULL,fd);
+ if (aeCreateFileEvent(server.el,fd,AE_READABLE,
+ readQueryFromClient, c) == AE_ERR)
+ {
+ close(fd);
+ zfree(c);
+ return NULL;
+ }
+ }
- anetNonBlock(NULL,fd);
- anetTcpNoDelay(NULL,fd);
- if (!c) return NULL;
selectDb(c,0);
c->fd = fd;
c->querybuf = sdsempty();
+ c->reqtype = 0;
c->argc = 0;
c->argv = NULL;
+ c->cmd = c->lastcmd = NULL;
+ c->multibulklen = 0;
c->bulklen = -1;
- c->multibulk = 0;
- c->mbargc = 0;
- c->mbargv = NULL;
c->sentlen = 0;
c->flags = 0;
c->lastinteraction = time(NULL);
c->reply = listCreate();
listSetFreeMethod(c->reply,decrRefCount);
listSetDupMethod(c->reply,dupClientReplyValue);
- c->blocking_keys = NULL;
- c->blocking_keys_num = 0;
+ c->bpop.keys = NULL;
+ c->bpop.count = 0;
+ c->bpop.timeout = 0;
+ c->bpop.target = NULL;
c->io_keys = listCreate();
c->watched_keys = listCreate();
listSetFreeMethod(c->io_keys,decrRefCount);
c->pubsub_patterns = listCreate();
listSetFreeMethod(c->pubsub_patterns,decrRefCount);
listSetMatchMethod(c->pubsub_patterns,listMatchObjects);
- if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
- readQueryFromClient, c) == AE_ERR) {
- freeClient(c);
- return NULL;
- }
- listAddNodeTail(server.clients,c);
+ if (fd != -1) listAddNodeTail(server.clients,c);
initClientMultiState(c);
return c;
}
-void addReply(redisClient *c, robj *obj) {
- if (listLength(c->reply) == 0 &&
+/* Set the event loop to listen for write events on the client's socket.
+ * Typically gets called every time a reply is built. */
+int _installWriteEvent(redisClient *c) {
+ if (c->flags & REDIS_LUA_CLIENT) return REDIS_OK;
+ if (c->fd <= 0) return REDIS_ERR;
+ if (c->bufpos == 0 && listLength(c->reply) == 0 &&
(c->replstate == REDIS_REPL_NONE ||
c->replstate == REDIS_REPL_ONLINE) &&
aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
- sendReplyToClient, c) == AE_ERR) return;
+ sendReplyToClient, c) == AE_ERR) return REDIS_ERR;
+ return REDIS_OK;
+}
- if (server.vm_enabled && obj->storage != REDIS_VM_MEMORY) {
- obj = dupStringObject(obj);
- obj->refcount = 0; /* getDecodedObject() will increment the refcount */
+/* Create a duplicate of the last object in the reply list when
+ * it is not exclusively owned by the reply list. */
+robj *dupLastObjectIfNeeded(list *reply) {
+ robj *new, *cur;
+ listNode *ln;
+ redisAssert(listLength(reply) > 0);
+ ln = listLast(reply);
+ cur = listNodeValue(ln);
+ if (cur->refcount > 1) {
+ new = dupStringObject(cur);
+ decrRefCount(cur);
+ listNodeValue(ln) = new;
}
- listAddNodeTail(c->reply,getDecodedObject(obj));
+ return listNodeValue(ln);
}
-void addReplySds(redisClient *c, sds s) {
- robj *o = createObject(REDIS_STRING,s);
- addReply(c,o);
- decrRefCount(o);
+/* -----------------------------------------------------------------------------
+ * Low level functions to add more data to output buffers.
+ * -------------------------------------------------------------------------- */
+
+int _addReplyToBuffer(redisClient *c, char *s, size_t len) {
+ size_t available = sizeof(c->buf)-c->bufpos;
+
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return REDIS_OK;
+
+ /* If there already are entries in the reply list, we cannot
+ * add anything more to the static buffer. */
+ if (listLength(c->reply) > 0) return REDIS_ERR;
+
+ /* Check that the buffer has enough space available for this string. */
+ if (len > available) return REDIS_ERR;
+
+ memcpy(c->buf+c->bufpos,s,len);
+ c->bufpos+=len;
+ return REDIS_OK;
}
-void addReplyDouble(redisClient *c, double d) {
- char buf[128];
+void _addReplyObjectToList(redisClient *c, robj *o) {
+ robj *tail;
- snprintf(buf,sizeof(buf),"%.17g",d);
- addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n%s\r\n",
- (unsigned long) strlen(buf),buf));
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return;
+
+ if (listLength(c->reply) == 0) {
+ incrRefCount(o);
+ listAddNodeTail(c->reply,o);
+ } else {
+ tail = listNodeValue(listLast(c->reply));
+
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+sdslen(o->ptr) <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,o->ptr,sdslen(o->ptr));
+ } else {
+ incrRefCount(o);
+ listAddNodeTail(c->reply,o);
+ }
+ }
}
-void addReplyLongLong(redisClient *c, long long ll) {
- char buf[128];
- size_t len;
+/* This method takes responsibility over the sds. When it is no longer
+ * needed it will be free'd, otherwise it ends up in a robj. */
+void _addReplySdsToList(redisClient *c, sds s) {
+ robj *tail;
- if (ll == 0) {
- addReply(c,shared.czero);
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) {
+ sdsfree(s);
return;
- } else if (ll == 1) {
- addReply(c,shared.cone);
+ }
+
+ if (listLength(c->reply) == 0) {
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,s));
+ } else {
+ tail = listNodeValue(listLast(c->reply));
+
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+sdslen(s) <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,s,sdslen(s));
+ sdsfree(s);
+ } else {
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,s));
+ }
+ }
+}
+
+void _addReplyStringToList(redisClient *c, char *s, size_t len) {
+ robj *tail;
+
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return;
+
+ if (listLength(c->reply) == 0) {
+ listAddNodeTail(c->reply,createStringObject(s,len));
+ } else {
+ tail = listNodeValue(listLast(c->reply));
+
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+len <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,s,len);
+ } else {
+ listAddNodeTail(c->reply,createStringObject(s,len));
+ }
+ }
+}
+
+/* -----------------------------------------------------------------------------
+ * Higher level functions to queue data on the client output buffer.
+ * The following functions are the ones that commands implementations will call.
+ * -------------------------------------------------------------------------- */
+
+void addReply(redisClient *c, robj *obj) {
+ if (_installWriteEvent(c) != REDIS_OK) return;
+
+ /* This is an important place where we can avoid copy-on-write
+ * when there is a saving child running, avoiding touching the
+ * refcount field of the object if it's not needed.
+ *
+ * If the encoding is RAW and there is room in the static buffer
+ * we'll be able to send the object to the client without
+ * messing with its page. */
+ if (obj->encoding == REDIS_ENCODING_RAW) {
+ if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != REDIS_OK)
+ _addReplyObjectToList(c,obj);
+ } else {
+ /* FIXME: convert the long into string and use _addReplyToBuffer()
+ * instead of calling getDecodedObject. As this place in the
+ * code is too performance critical. */
+ obj = getDecodedObject(obj);
+ if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != REDIS_OK)
+ _addReplyObjectToList(c,obj);
+ decrRefCount(obj);
+ }
+}
+
+void addReplySds(redisClient *c, sds s) {
+ if (_installWriteEvent(c) != REDIS_OK) {
+ /* The caller expects the sds to be free'd. */
+ sdsfree(s);
return;
}
- buf[0] = ':';
+ if (_addReplyToBuffer(c,s,sdslen(s)) == REDIS_OK) {
+ sdsfree(s);
+ } else {
+ /* This method free's the sds when it is no longer needed. */
+ _addReplySdsToList(c,s);
+ }
+}
+
+void addReplyString(redisClient *c, char *s, size_t len) {
+ if (_installWriteEvent(c) != REDIS_OK) return;
+ if (_addReplyToBuffer(c,s,len) != REDIS_OK)
+ _addReplyStringToList(c,s,len);
+}
+
+void _addReplyError(redisClient *c, char *s, size_t len) {
+ addReplyString(c,"-ERR ",5);
+ addReplyString(c,s,len);
+ addReplyString(c,"\r\n",2);
+}
+
+void addReplyError(redisClient *c, char *err) {
+ _addReplyError(c,err,strlen(err));
+}
+
+void addReplyErrorFormat(redisClient *c, const char *fmt, ...) {
+ size_t l, j;
+ va_list ap;
+ va_start(ap,fmt);
+ sds s = sdscatvprintf(sdsempty(),fmt,ap);
+ va_end(ap);
+ /* Make sure there are no newlines in the string, otherwise invalid protocol
+ * is emitted. */
+ l = sdslen(s);
+ for (j = 0; j < l; j++) {
+ if (s[j] == '\r' || s[j] == '\n') s[j] = ' ';
+ }
+ _addReplyError(c,s,sdslen(s));
+ sdsfree(s);
+}
+
+void _addReplyStatus(redisClient *c, char *s, size_t len) {
+ addReplyString(c,"+",1);
+ addReplyString(c,s,len);
+ addReplyString(c,"\r\n",2);
+}
+
+void addReplyStatus(redisClient *c, char *status) {
+ _addReplyStatus(c,status,strlen(status));
+}
+
+void addReplyStatusFormat(redisClient *c, const char *fmt, ...) {
+ va_list ap;
+ va_start(ap,fmt);
+ sds s = sdscatvprintf(sdsempty(),fmt,ap);
+ va_end(ap);
+ _addReplyStatus(c,s,sdslen(s));
+ sdsfree(s);
+}
+
+/* Adds an empty object to the reply list that will contain the multi bulk
+ * length, which is not known when this function is called. */
+void *addDeferredMultiBulkLength(redisClient *c) {
+ /* Note that we install the write event here even if the object is not
+ * ready to be sent, since we are sure that before returning to the
+ * event loop setDeferredMultiBulkLength() will be called. */
+ if (_installWriteEvent(c) != REDIS_OK) return NULL;
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,NULL));
+ return listLast(c->reply);
+}
+
+/* Populate the length object and try glueing it to the next chunk. */
+void setDeferredMultiBulkLength(redisClient *c, void *node, long length) {
+ listNode *ln = (listNode*)node;
+ robj *len, *next;
+
+ /* Abort when *node is NULL (see addDeferredMultiBulkLength). */
+ if (node == NULL) return;
+
+ len = listNodeValue(ln);
+ len->ptr = sdscatprintf(sdsempty(),"*%ld\r\n",length);
+ if (ln->next != NULL) {
+ next = listNodeValue(ln->next);
+
+ /* Only glue when the next node is non-NULL (an sds in this case) */
+ if (next->ptr != NULL) {
+ len->ptr = sdscatlen(len->ptr,next->ptr,sdslen(next->ptr));
+ listDelNode(c->reply,ln->next);
+ }
+ }
+}
+
+/* Add a duble as a bulk reply */
+void addReplyDouble(redisClient *c, double d) {
+ char dbuf[128], sbuf[128];
+ int dlen, slen;
+ dlen = snprintf(dbuf,sizeof(dbuf),"%.17g",d);
+ slen = snprintf(sbuf,sizeof(sbuf),"$%d\r\n%s\r\n",dlen,dbuf);
+ addReplyString(c,sbuf,slen);
+}
+
+/* Add a long long as integer reply or bulk len / multi bulk count.
+ * Basically this is used to output <prefix><long long><crlf>. */
+void _addReplyLongLong(redisClient *c, long long ll, char prefix) {
+ char buf[128];
+ int len;
+ buf[0] = prefix;
len = ll2string(buf+1,sizeof(buf)-1,ll);
buf[len+1] = '\r';
buf[len+2] = '\n';
- addReplySds(c,sdsnewlen(buf,len+3));
+ addReplyString(c,buf,len+3);
}
-void addReplyUlong(redisClient *c, unsigned long ul) {
- char buf[128];
- size_t len;
-
- if (ul == 0) {
+void addReplyLongLong(redisClient *c, long long ll) {
+ if (ll == 0)
addReply(c,shared.czero);
- return;
- } else if (ul == 1) {
+ else if (ll == 1)
addReply(c,shared.cone);
- return;
- }
- len = snprintf(buf,sizeof(buf),":%lu\r\n",ul);
- addReplySds(c,sdsnewlen(buf,len));
+ else
+ _addReplyLongLong(c,ll,':');
+}
+
+void addReplyMultiBulkLen(redisClient *c, long length) {
+ _addReplyLongLong(c,length,'*');
}
+/* Create the length prefix of a bulk reply, example: $2234 */
void addReplyBulkLen(redisClient *c, robj *obj) {
- size_t len, intlen;
- char buf[128];
+ size_t len;
if (obj->encoding == REDIS_ENCODING_RAW) {
len = sdslen(obj->ptr);
len++;
}
}
- buf[0] = '$';
- intlen = ll2string(buf+1,sizeof(buf)-1,(long long)len);
- buf[intlen+1] = '\r';
- buf[intlen+2] = '\n';
- addReplySds(c,sdsnewlen(buf,intlen+3));
+ _addReplyLongLong(c,len,'$');
}
+/* Add a Redis Object as a bulk reply */
void addReplyBulk(redisClient *c, robj *obj) {
addReplyBulkLen(c,obj);
addReply(c,obj);
addReply(c,shared.crlf);
}
-/* In the CONFIG command we need to add vanilla C string as bulk replies */
+/* Add a C buffer as bulk reply */
+void addReplyBulkCBuffer(redisClient *c, void *p, size_t len) {
+ _addReplyLongLong(c,len,'$');
+ addReplyString(c,p,len);
+ addReply(c,shared.crlf);
+}
+
+/* Add a C nul term string as bulk reply */
void addReplyBulkCString(redisClient *c, char *s) {
if (s == NULL) {
addReply(c,shared.nullbulk);
} else {
- robj *o = createStringObject(s,strlen(s));
- addReplyBulk(c,o);
- decrRefCount(o);
+ addReplyBulkCBuffer(c,s,strlen(s));
}
}
+/* Add a long long as a bulk reply */
+void addReplyBulkLongLong(redisClient *c, long long ll) {
+ char buf[64];
+ int len;
+
+ len = ll2string(buf,64,ll);
+ addReplyBulkCBuffer(c,buf,len);
+}
+
static void acceptCommonHandler(int fd) {
redisClient *c;
if ((c = createClient(fd)) == NULL) {
* connection. Note that we create the client instead to check before
* for this condition, since now the socket is already set in nonblocking
* mode and we can send an error for free using the Kernel I/O */
- if (server.maxclients && listLength(server.clients) > server.maxclients) {
+ if (listLength(server.clients) > server.maxclients) {
char *err = "-ERR max number of clients reached\r\n";
/* That's a best effort error message, don't check write errors */
if (write(c->fd,err,strlen(err)) == -1) {
/* Nothing to do, Just to avoid the warning... */
}
+ server.stat_rejected_conn++;
freeClient(c);
return;
}
cfd = anetTcpAccept(server.neterr, fd, cip, &cport);
if (cfd == AE_ERR) {
- redisLog(REDIS_VERBOSE,"Accepting client connection: %s", server.neterr);
+ redisLog(REDIS_WARNING,"Accepting client connection: %s", server.neterr);
return;
}
redisLog(REDIS_VERBOSE,"Accepted %s:%d", cip, cport);
cfd = anetUnixAccept(server.neterr, fd);
if (cfd == AE_ERR) {
- redisLog(REDIS_VERBOSE,"Accepting client connection: %s", server.neterr);
+ redisLog(REDIS_WARNING,"Accepting client connection: %s", server.neterr);
return;
}
redisLog(REDIS_VERBOSE,"Accepted connection to %s", server.unixsocket);
static void freeClientArgv(redisClient *c) {
int j;
-
for (j = 0; j < c->argc; j++)
decrRefCount(c->argv[j]);
- for (j = 0; j < c->mbargc; j++)
- decrRefCount(c->mbargv[j]);
c->argc = 0;
- c->mbargc = 0;
+ c->cmd = NULL;
}
void freeClient(redisClient *c) {
ln = listSearchKey(server.clients,c);
redisAssert(ln != NULL);
listDelNode(server.clients,ln);
- /* Remove from the list of clients waiting for swapped keys, or ready
- * to be restarted, but not yet woken up again. */
- if (c->flags & REDIS_IO_WAIT) {
- redisAssert(server.vm_enabled);
- if (listLength(c->io_keys) == 0) {
- ln = listSearchKey(server.io_ready_clients,c);
-
- /* When this client is waiting to be woken up (REDIS_IO_WAIT),
- * it should be present in the list io_ready_clients */
- redisAssert(ln != NULL);
- listDelNode(server.io_ready_clients,ln);
- } else {
- while (listLength(c->io_keys)) {
- ln = listFirst(c->io_keys);
- dontWaitForSwappedKey(c,ln->value);
- }
- }
- server.vm_blocked_clients--;
+ /* When client was just unblocked because of a blocking operation,
+ * remove it from the list with unblocked clients. */
+ if (c->flags & REDIS_UNBLOCKED) {
+ ln = listSearchKey(server.unblocked_clients,c);
+ redisAssert(ln != NULL);
+ listDelNode(server.unblocked_clients,ln);
}
listRelease(c->io_keys);
- /* Master/slave cleanup */
+ /* Master/slave cleanup.
+ * Case 1: we lost the connection with a slave. */
if (c->flags & REDIS_SLAVE) {
if (c->replstate == REDIS_REPL_SEND_BULK && c->repldbfd != -1)
close(c->repldbfd);
redisAssert(ln != NULL);
listDelNode(l,ln);
}
+
+ /* Case 2: we lost the connection with the master. */
if (c->flags & REDIS_MASTER) {
server.master = NULL;
server.replstate = REDIS_REPL_CONNECT;
+ server.repl_down_since = time(NULL);
+ /* Since we lost the connection with the master, we should also
+ * close the connection with all our slaves if we have any, so
+ * when we'll resync with the master the other slaves will sync again
+ * with us as well. Note that also when the slave is not connected
+ * to the master it will keep refusing connections by other slaves.
+ *
+ * We do this only if server.masterhost != NULL. If it is NULL this
+ * means the user called SLAVEOF NO ONE and we are freeing our
+ * link with the master, so no need to close link with slaves. */
+ if (server.masterhost != NULL) {
+ while (listLength(server.slaves)) {
+ ln = listFirst(server.slaves);
+ freeClient((redisClient*)ln->value);
+ }
+ }
}
/* Release memory */
zfree(c->argv);
- zfree(c->mbargv);
freeClientMultiState(c);
zfree(c);
}
-#define GLUEREPLY_UP_TO (1024)
-static void glueReplyBuffersIfNeeded(redisClient *c) {
- int copylen = 0;
- char buf[GLUEREPLY_UP_TO];
- listNode *ln;
- listIter li;
- robj *o;
-
- listRewind(c->reply,&li);
- while((ln = listNext(&li))) {
- int objlen;
-
- o = ln->value;
- 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,copylen));
- listAddNodeHead(c->reply,o);
-}
-
void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = privdata;
int nwritten = 0, totwritten = 0, objlen;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
- /* 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(c->bufpos > 0 || listLength(c->reply)) {
+ if (c->bufpos > 0) {
+ if (c->flags & REDIS_MASTER) {
+ /* Don't reply to a master */
+ nwritten = c->bufpos - c->sentlen;
+ } else {
+ nwritten = write(fd,c->buf+c->sentlen,c->bufpos-c->sentlen);
+ if (nwritten <= 0) break;
+ }
+ c->sentlen += nwritten;
+ totwritten += nwritten;
- while(listLength(c->reply)) {
- if (server.glueoutputbuf && listLength(c->reply) > 1)
- glueReplyBuffersIfNeeded(c);
+ /* If the buffer was sent, set bufpos to zero to continue with
+ * the remainder of the reply. */
+ if (c->sentlen == c->bufpos) {
+ c->bufpos = 0;
+ c->sentlen = 0;
+ }
+ } else {
+ o = listNodeValue(listFirst(c->reply));
+ objlen = sdslen(o->ptr);
- o = listNodeValue(listFirst(c->reply));
- objlen = sdslen(o->ptr);
+ if (objlen == 0) {
+ listDelNode(c->reply,listFirst(c->reply));
+ continue;
+ }
- if (objlen == 0) {
- listDelNode(c->reply,listFirst(c->reply));
- continue;
- }
+ if (c->flags & REDIS_MASTER) {
+ /* Don't reply to a master */
+ nwritten = objlen - c->sentlen;
+ } else {
+ nwritten = write(fd, ((char*)o->ptr)+c->sentlen,objlen-c->sentlen);
+ if (nwritten <= 0) break;
+ }
+ c->sentlen += nwritten;
+ totwritten += nwritten;
- if (c->flags & REDIS_MASTER) {
- /* Don't reply to a master */
- nwritten = objlen - c->sentlen;
- } else {
- nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen);
- if (nwritten <= 0) break;
- }
- c->sentlen += nwritten;
- totwritten += nwritten;
- /* If we fully sent the object on head go to the next one */
- if (c->sentlen == objlen) {
- listDelNode(c->reply,listFirst(c->reply));
- c->sentlen = 0;
+ /* If we fully sent the object on head go to the next one */
+ if (c->sentlen == objlen) {
+ listDelNode(c->reply,listFirst(c->reply));
+ 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 serve
}
}
if (totwritten > 0) c->lastinteraction = time(NULL);
- if (listLength(c->reply) == 0) {
+ if (c->bufpos == 0 && listLength(c->reply) == 0) {
c->sentlen = 0;
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
- }
-}
-
-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_VERBOSE,
- "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);
+ /* Close connection after entire reply has been sent. */
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) freeClient(c);
}
}
/* resetClient prepare the client to process the next command */
void resetClient(redisClient *c) {
freeClientArgv(c);
+ c->reqtype = 0;
+ c->multibulklen = 0;
c->bulklen = -1;
- c->multibulk = 0;
+ /* We clear the ASKING flag as well if we are not inside a MULTI. */
+ if (!(c->flags & REDIS_MULTI)) c->flags &= (~REDIS_ASKING);
}
void closeTimedoutClients(void) {
if (server.maxidletime &&
!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
!(c->flags & REDIS_MASTER) && /* no timeout for masters */
+ !(c->flags & REDIS_BLOCKED) && /* no timeout for BLPOP */
dictSize(c->pubsub_channels) == 0 && /* no timeout for pubsub */
listLength(c->pubsub_patterns) == 0 &&
(now - c->lastinteraction > server.maxidletime))
redisLog(REDIS_VERBOSE,"Closing idle client");
freeClient(c);
} else if (c->flags & REDIS_BLOCKED) {
- if (c->blockingto != 0 && c->blockingto < now) {
+ if (c->bpop.timeout != 0 && c->bpop.timeout < now) {
addReply(c,shared.nullmultibulk);
unblockClientWaitingData(c);
}
}
}
-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 || c->flags & REDIS_IO_WAIT) return;
- if (c->bulklen == -1) {
- /* Read the first line of the query */
- char *p = strchr(c->querybuf,'\n');
- size_t querylen;
-
- if (p) {
- sds query, *argv;
- int argc, j;
-
- query = c->querybuf;
- c->querybuf = sdsempty();
- querylen = 1+(p-(query));
- if (sdslen(query) > querylen) {
- /* leave data after the first line of the query in the buffer */
- c->querybuf = sdscatlen(c->querybuf,query+querylen,sdslen(query)-querylen);
+int processInlineBuffer(redisClient *c) {
+ char *newline = strstr(c->querybuf,"\r\n");
+ int argc, j;
+ sds *argv;
+ size_t querylen;
+
+ /* Nothing to do without a \r\n */
+ if (newline == NULL)
+ return REDIS_ERR;
+
+ /* Split the input buffer up to the \r\n */
+ querylen = newline-(c->querybuf);
+ argv = sdssplitlen(c->querybuf,querylen," ",1,&argc);
+
+ /* Leave data after the first line of the query in the buffer */
+ c->querybuf = sdsrange(c->querybuf,querylen+2,-1);
+
+ /* Setup argv array on client structure */
+ if (c->argv) zfree(c->argv);
+ c->argv = zmalloc(sizeof(robj*)*argc);
+
+ /* Create redis objects for all arguments. */
+ for (c->argc = 0, j = 0; j < argc; j++) {
+ if (sdslen(argv[j])) {
+ c->argv[c->argc] = createObject(REDIS_STRING,argv[j]);
+ c->argc++;
+ } else {
+ sdsfree(argv[j]);
+ }
+ }
+ zfree(argv);
+ return REDIS_OK;
+}
+
+/* Helper function. Trims query buffer to make the function that processes
+ * multi bulk requests idempotent. */
+static void setProtocolError(redisClient *c, int pos) {
+ c->flags |= REDIS_CLOSE_AFTER_REPLY;
+ c->querybuf = sdsrange(c->querybuf,pos,-1);
+}
+
+int processMultibulkBuffer(redisClient *c) {
+ char *newline = NULL;
+ int pos = 0, ok;
+ long long ll;
+
+ if (c->multibulklen == 0) {
+ /* The client should have been reset */
+ redisAssertWithInfo(c,NULL,c->argc == 0);
+
+ /* Multi bulk length cannot be read without a \r\n */
+ newline = strchr(c->querybuf,'\r');
+ if (newline == NULL)
+ return REDIS_ERR;
+
+ /* Buffer should also contain \n */
+ if (newline-(c->querybuf) > ((signed)sdslen(c->querybuf)-2))
+ return REDIS_ERR;
+
+ /* We know for sure there is a whole line since newline != NULL,
+ * so go ahead and find out the multi bulk length. */
+ redisAssertWithInfo(c,NULL,c->querybuf[0] == '*');
+ ok = string2ll(c->querybuf+1,newline-(c->querybuf+1),&ll);
+ if (!ok || ll > 1024*1024) {
+ addReplyError(c,"Protocol error: invalid multibulk length");
+ setProtocolError(c,pos);
+ return REDIS_ERR;
+ }
+
+ pos = (newline-c->querybuf)+2;
+ if (ll <= 0) {
+ c->querybuf = sdsrange(c->querybuf,pos,-1);
+ return REDIS_OK;
+ }
+
+ c->multibulklen = ll;
+
+ /* Setup argv array on client structure */
+ if (c->argv) zfree(c->argv);
+ c->argv = zmalloc(sizeof(robj*)*c->multibulklen);
+ }
+
+ redisAssertWithInfo(c,NULL,c->multibulklen > 0);
+ while(c->multibulklen) {
+ /* Read bulk length if unknown */
+ if (c->bulklen == -1) {
+ newline = strchr(c->querybuf+pos,'\r');
+ if (newline == NULL)
+ break;
+
+ /* Buffer should also contain \n */
+ if (newline-(c->querybuf) > ((signed)sdslen(c->querybuf)-2))
+ break;
+
+ if (c->querybuf[pos] != '$') {
+ addReplyErrorFormat(c,
+ "Protocol error: expected '$', got '%c'",
+ c->querybuf[pos]);
+ setProtocolError(c,pos);
+ return REDIS_ERR;
}
- *p = '\0'; /* remove "\n" */
- if (*(p-1) == '\r') *(p-1) = '\0'; /* and "\r" if any */
- sdsupdatelen(query);
- /* Now we can split the query in arguments */
- argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
- sdsfree(query);
+ ok = string2ll(c->querybuf+pos+1,newline-(c->querybuf+pos+1),&ll);
+ if (!ok || ll < 0 || ll > 512*1024*1024) {
+ addReplyError(c,"Protocol error: invalid bulk length");
+ setProtocolError(c,pos);
+ return REDIS_ERR;
+ }
- if (c->argv) zfree(c->argv);
- c->argv = zmalloc(sizeof(robj*)*argc);
+ pos += newline-(c->querybuf+pos)+2;
+ if (ll >= REDIS_MBULK_BIG_ARG) {
+ /* If we are going to read a large object from network
+ * try to make it likely that it will start at c->querybuf
+ * boundary so that we can optimized object creation
+ * avoiding a large copy of data. */
+ c->querybuf = sdsrange(c->querybuf,pos,-1);
+ pos = 0;
+ /* Hint the sds library about the amount of bytes this string is
+ * going to contain. */
+ c->querybuf = sdsMakeRoomFor(c->querybuf,ll+2);
+ }
+ c->bulklen = ll;
+ }
- for (j = 0; j < argc; j++) {
- if (sdslen(argv[j])) {
- c->argv[c->argc] = createObject(REDIS_STRING,argv[j]);
- c->argc++;
- } else {
- sdsfree(argv[j]);
- }
+ /* Read bulk argument */
+ if (sdslen(c->querybuf)-pos < (unsigned)(c->bulklen+2)) {
+ /* Not enough data (+2 == trailing \r\n) */
+ break;
+ } else {
+ /* Optimization: if the buffer contanins JUST our bulk element
+ * instead of creating a new object by *copying* the sds we
+ * just use the current sds string. */
+ if (pos == 0 &&
+ c->bulklen >= REDIS_MBULK_BIG_ARG &&
+ (signed) sdslen(c->querybuf) == c->bulklen+2)
+ {
+ c->argv[c->argc++] = createObject(REDIS_STRING,c->querybuf);
+ sdsIncrLen(c->querybuf,-2); /* remove CRLF */
+ c->querybuf = sdsempty();
+ /* Assume that if we saw a fat argument we'll see another one
+ * likely... */
+ c->querybuf = sdsMakeRoomFor(c->querybuf,c->bulklen+2);
+ pos = 0;
+ } else {
+ c->argv[c->argc++] =
+ createStringObject(c->querybuf+pos,c->bulklen);
+ pos += c->bulklen+2;
}
- zfree(argv);
- 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;
+ c->bulklen = -1;
+ c->multibulklen--;
+ }
+ }
+
+ /* Trim to pos */
+ if (pos) c->querybuf = sdsrange(c->querybuf,pos,-1);
+
+ /* We're done when c->multibulk == 0 */
+ if (c->multibulklen == 0) {
+ return REDIS_OK;
+ }
+ return REDIS_ERR;
+}
+
+void processInputBuffer(redisClient *c) {
+ /* Keep processing while there is something in the input buffer */
+ while(sdslen(c->querybuf)) {
+ /* Immediately abort if the client is in the middle of something. */
+ if (c->flags & REDIS_BLOCKED) return;
+
+ /* REDIS_CLOSE_AFTER_REPLY closes the connection once the reply is
+ * written to the client. Make sure to not let the reply grow after
+ * this flag has been set (i.e. don't process more commands). */
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return;
+
+ /* Determine request type when unknown. */
+ if (!c->reqtype) {
+ if (c->querybuf[0] == '*') {
+ c->reqtype = REDIS_REQ_MULTIBULK;
} 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;
+ c->reqtype = REDIS_REQ_INLINE;
}
- return;
- } else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) {
- redisLog(REDIS_VERBOSE, "Client protocol error");
- freeClient(c);
- return;
}
- } else {
- /* Bulk read handling. Note that if we are at this point
- the client already sent a command terminated with a newline,
- we are reading the bulk data that is actually the last
- argument of the command. */
- int qbl = sdslen(c->querybuf);
-
- if (c->bulklen <= qbl) {
- /* Copy everything but the final CRLF as final argument */
- c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
- c->argc++;
- c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
- /* Process the command. If the client is still valid after
- * the processing and there is more data in the buffer
- * try to parse it. */
- if (processCommand(c) && sdslen(c->querybuf)) goto again;
- return;
+
+ if (c->reqtype == REDIS_REQ_INLINE) {
+ if (processInlineBuffer(c) != REDIS_OK) break;
+ } else if (c->reqtype == REDIS_REQ_MULTIBULK) {
+ if (processMultibulkBuffer(c) != REDIS_OK) break;
+ } else {
+ redisPanic("Unknown request type");
+ }
+
+ /* Multibulk processing could see a <= 0 length. */
+ if (c->argc == 0) {
+ resetClient(c);
+ } else {
+ /* Only reset the client when the command was executed. */
+ if (processCommand(c) == REDIS_OK)
+ resetClient(c);
}
}
}
void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = (redisClient*) privdata;
- char buf[REDIS_IOBUF_LEN];
- int nread;
+ int nread, readlen;
+ size_t qblen;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
- nread = read(fd, buf, REDIS_IOBUF_LEN);
+ readlen = REDIS_IOBUF_LEN;
+ /* If this is a multi bulk request, and we are processing a bulk reply
+ * that is large enough, try to maximize the probabilty that the query
+ * buffer contains excatly the SDS string representing the object, even
+ * at the risk of requring more read(2) calls. This way the function
+ * processMultiBulkBuffer() can avoid copying buffers to create the
+ * Redis Object representing the argument. */
+ if (c->reqtype == REDIS_REQ_MULTIBULK && c->multibulklen && c->bulklen != -1
+ && c->bulklen >= REDIS_MBULK_BIG_ARG)
+ {
+ int remaining = (unsigned)(c->bulklen+2)-sdslen(c->querybuf);
+
+ if (remaining < readlen) readlen = remaining;
+ }
+
+ qblen = sdslen(c->querybuf);
+ c->querybuf = sdsMakeRoomFor(c->querybuf, readlen);
+ nread = read(fd, c->querybuf+qblen, readlen);
if (nread == -1) {
if (errno == EAGAIN) {
nread = 0;
return;
}
if (nread) {
- c->querybuf = sdscatlen(c->querybuf, buf, nread);
+ sdsIncrLen(c->querybuf,nread);
c->lastinteraction = time(NULL);
} else {
return;
}
+ if (sdslen(c->querybuf) > server.client_max_querybuf_len) {
+ sds ci = getClientInfoString(c);
+ redisLog(REDIS_WARNING,"Closing client that reached max query buffer length: %s", ci);
+ sdsfree(ci);
+ freeClient(c);
+ return;
+ }
processInputBuffer(c);
}
+
+void getClientsMaxBuffers(unsigned long *longest_output_list,
+ unsigned long *biggest_input_buffer) {
+ redisClient *c;
+ listNode *ln;
+ listIter li;
+ unsigned long lol = 0, bib = 0;
+
+ listRewind(server.clients,&li);
+ while ((ln = listNext(&li)) != NULL) {
+ c = listNodeValue(ln);
+
+ if (listLength(c->reply) > lol) lol = listLength(c->reply);
+ if (sdslen(c->querybuf) > bib) bib = sdslen(c->querybuf);
+ }
+ *longest_output_list = lol;
+ *biggest_input_buffer = bib;
+}
+
+/* Turn a Redis client into an sds string representing its state. */
+sds getClientInfoString(redisClient *client) {
+ char ip[32], flags[16], events[3], *p;
+ int port;
+ time_t now = time(NULL);
+ int emask;
+
+ if (anetPeerToString(client->fd,ip,&port) == -1) {
+ ip[0] = '?';
+ ip[1] = '\0';
+ port = 0;
+ }
+ p = flags;
+ if (client->flags & REDIS_SLAVE) {
+ if (client->flags & REDIS_MONITOR)
+ *p++ = 'O';
+ else
+ *p++ = 'S';
+ }
+ if (client->flags & REDIS_MASTER) *p++ = 'M';
+ if (client->flags & REDIS_MULTI) *p++ = 'x';
+ if (client->flags & REDIS_BLOCKED) *p++ = 'b';
+ if (client->flags & REDIS_DIRTY_CAS) *p++ = 'd';
+ if (client->flags & REDIS_CLOSE_AFTER_REPLY) *p++ = 'c';
+ if (client->flags & REDIS_UNBLOCKED) *p++ = 'u';
+ if (p == flags) *p++ = 'N';
+ *p++ = '\0';
+
+ emask = client->fd == -1 ? 0 : aeGetFileEvents(server.el,client->fd);
+ p = events;
+ if (emask & AE_READABLE) *p++ = 'r';
+ if (emask & AE_WRITABLE) *p++ = 'w';
+ *p = '\0';
+ return sdscatprintf(sdsempty(),
+ "addr=%s:%d fd=%d idle=%ld flags=%s db=%d sub=%d psub=%d qbuf=%lu obl=%lu oll=%lu events=%s cmd=%s",
+ ip,port,client->fd,
+ (long)(now - client->lastinteraction),
+ flags,
+ client->db->id,
+ (int) dictSize(client->pubsub_channels),
+ (int) listLength(client->pubsub_patterns),
+ (unsigned long) sdslen(client->querybuf),
+ (unsigned long) client->bufpos,
+ (unsigned long) listLength(client->reply),
+ events,
+ client->lastcmd ? client->lastcmd->name : "NULL");
+}
+
+sds getAllClientsInfoString(void) {
+ listNode *ln;
+ listIter li;
+ redisClient *client;
+ sds o = sdsempty();
+
+ listRewind(server.clients,&li);
+ while ((ln = listNext(&li)) != NULL) {
+ client = listNodeValue(ln);
+ o = sdscatsds(o,getClientInfoString(client));
+ o = sdscatlen(o,"\n",1);
+ }
+ return o;
+}
+
+void clientCommand(redisClient *c) {
+ listNode *ln;
+ listIter li;
+ redisClient *client;
+
+ if (!strcasecmp(c->argv[1]->ptr,"list") && c->argc == 2) {
+ sds o = getAllClientsInfoString();
+ addReplyBulkCBuffer(c,o,sdslen(o));
+ sdsfree(o);
+ } else if (!strcasecmp(c->argv[1]->ptr,"kill") && c->argc == 3) {
+ listRewind(server.clients,&li);
+ while ((ln = listNext(&li)) != NULL) {
+ char ip[32], addr[64];
+ int port;
+
+ client = listNodeValue(ln);
+ if (anetPeerToString(client->fd,ip,&port) == -1) continue;
+ snprintf(addr,sizeof(addr),"%s:%d",ip,port);
+ if (strcmp(addr,c->argv[2]->ptr) == 0) {
+ addReply(c,shared.ok);
+ if (c == client) {
+ client->flags |= REDIS_CLOSE_AFTER_REPLY;
+ } else {
+ freeClient(client);
+ }
+ return;
+ }
+ }
+ addReplyError(c,"No such client");
+ } else {
+ addReplyError(c, "Syntax error, try CLIENT (LIST | KILL ip:port)");
+ }
+}
+
+/* Rewrite the command vector of the client. All the new objects ref count
+ * is incremented. The old command vector is freed, and the old objects
+ * ref count is decremented. */
+void rewriteClientCommandVector(redisClient *c, int argc, ...) {
+ va_list ap;
+ int j;
+ robj **argv; /* The new argument vector */
+
+ argv = zmalloc(sizeof(robj*)*argc);
+ va_start(ap,argc);
+ for (j = 0; j < argc; j++) {
+ robj *a;
+
+ a = va_arg(ap, robj*);
+ argv[j] = a;
+ incrRefCount(a);
+ }
+ /* We free the objects in the original vector at the end, so we are
+ * sure that if the same objects are reused in the new vector the
+ * refcount gets incremented before it gets decremented. */
+ for (j = 0; j < c->argc; j++) decrRefCount(c->argv[j]);
+ zfree(c->argv);
+ /* Replace argv and argc with our new versions. */
+ c->argv = argv;
+ c->argc = argc;
+ c->cmd = lookupCommand(c->argv[0]->ptr);
+ redisAssertWithInfo(c,NULL,c->cmd != NULL);
+ va_end(ap);
+}
+
+/* Rewrite a single item in the command vector.
+ * The new val ref count is incremented, and the old decremented. */
+void rewriteClientCommandArgument(redisClient *c, int i, robj *newval) {
+ robj *oldval;
+
+ redisAssertWithInfo(c,NULL,i < c->argc);
+ oldval = c->argv[i];
+ c->argv[i] = newval;
+ incrRefCount(newval);
+ decrRefCount(oldval);
+
+ /* If this is the command name make sure to fix c->cmd. */
+ if (i == 0) {
+ c->cmd = lookupCommand(c->argv[0]->ptr);
+ redisAssertWithInfo(c,NULL,c->cmd != NULL);
+ }
+}
projects / redis.git / blobdiff