redisClient *c = zmalloc(sizeof(redisClient));
c->bufpos = 0;
- anetNonBlock(NULL,fd);
- anetTcpNoDelay(NULL,fd);
- if (!c) return NULL;
- if (aeCreateFileEvent(server.el,fd,AE_READABLE,
- readQueryFromClient, c) == AE_ERR)
- {
- close(fd);
- zfree(c);
- return NULL;
+ /* 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;
+ }
}
selectDb(c,0);
c->reqtype = 0;
c->argc = 0;
c->argv = NULL;
+ c->cmd = c->lastcmd = NULL;
c->multibulklen = 0;
c->bulklen = -1;
c->sentlen = 0;
c->pubsub_patterns = listCreate();
listSetFreeMethod(c->pubsub_patterns,decrRefCount);
listSetMatchMethod(c->pubsub_patterns,listMatchObjects);
- listAddNodeTail(server.clients,c);
+ if (fd != -1) listAddNodeTail(server.clients,c);
initClientMultiState(c);
return c;
}
/* 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) {
- /* When CLOSE_AFTER_REPLY is set, no more replies may be added! */
- redisAssert(!(c->flags & REDIS_CLOSE_AFTER_REPLY));
-
+ 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 ||
return listNodeValue(ln);
}
+/* -----------------------------------------------------------------------------
+ * 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;
void _addReplyObjectToList(redisClient *c, robj *o) {
robj *tail;
+
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return;
+
if (listLength(c->reply) == 0) {
incrRefCount(o);
listAddNodeTail(c->reply,o);
* needed it will be free'd, otherwise it ends up in a robj. */
void _addReplySdsToList(redisClient *c, sds s) {
robj *tail;
+
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) {
+ sdsfree(s);
+ return;
+ }
+
if (listLength(c->reply) == 0) {
listAddNodeTail(c->reply,createObject(REDIS_STRING,s));
} else {
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 {
}
}
+/* -----------------------------------------------------------------------------
+ * 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;
}
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 addReplyLongLong(redisClient *c, long long ll) {
- _addReplyLongLong(c,ll,':');
+ if (ll == 0)
+ addReply(c,shared.czero);
+ else if (ll == 1)
+ addReply(c,shared.cone);
+ else
+ _addReplyLongLong(c,ll,':');
}
void addReplyMultiBulkLen(redisClient *c, long length) {
* 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);
for (j = 0; j < c->argc; j++)
decrRefCount(c->argv[j]);
c->argc = 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.ds_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.cache_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.
/* Case 2: we lost the connection with the master. */
if (c->flags & REDIS_MASTER) {
server.master = NULL;
- /* FIXME */
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. */
- while (listLength(server.slaves)) {
- ln = listFirst(server.slaves);
- freeClient((redisClient*)ln->value);
+ * 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 */
}
}
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);
c->reqtype = 0;
c->multibulklen = 0;
c->bulklen = -1;
+ /* 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) {
int processMultibulkBuffer(redisClient *c) {
char *newline = NULL;
- char *eptr;
- int pos = 0, tolerr;
- long bulklen;
+ int pos = 0, ok;
+ long long ll;
if (c->multibulklen == 0) {
/* The client should have been reset */
- redisAssert(c->argc == 0);
+ redisAssertWithInfo(c,NULL,c->argc == 0);
/* Multi bulk length cannot be read without a \r\n */
- newline = strstr(c->querybuf,"\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. */
- redisAssert(c->querybuf[0] == '*');
- c->multibulklen = strtol(c->querybuf+1,&eptr,10);
- pos = (newline-c->querybuf)+2;
- if (c->multibulklen <= 0) {
- c->querybuf = sdsrange(c->querybuf,pos,-1);
- return REDIS_OK;
- } else if (c->multibulklen > 1024*1024) {
+ 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);
-
- /* Search new newline */
- newline = strstr(c->querybuf+pos,"\r\n");
}
- redisAssert(c->multibulklen > 0);
+ redisAssertWithInfo(c,NULL,c->multibulklen > 0);
while(c->multibulklen) {
/* Read bulk length if unknown */
if (c->bulklen == -1) {
- newline = strstr(c->querybuf+pos,"\r\n");
- if (newline != NULL) {
- if (c->querybuf[pos] != '$') {
- addReplyErrorFormat(c,
- "Protocol error: expected '$', got '%c'",
- c->querybuf[pos]);
- setProtocolError(c,pos);
- return REDIS_ERR;
- }
+ newline = strchr(c->querybuf+pos,'\r');
+ if (newline == NULL)
+ break;
- bulklen = strtol(c->querybuf+pos+1,&eptr,10);
- tolerr = (eptr[0] != '\r');
- if (tolerr || bulklen == LONG_MIN || bulklen == LONG_MAX ||
- bulklen < 0 || bulklen > 512*1024*1024)
- {
- addReplyError(c,"Protocol error: invalid bulk length");
- setProtocolError(c,pos);
- return REDIS_ERR;
- }
- pos += eptr-(c->querybuf+pos)+2;
- c->bulklen = bulklen;
- } else {
- /* No newline in current buffer, so wait for more data */
+ /* 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;
+ }
+
+ 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;
+ }
+
+ 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;
}
/* Read bulk argument */
/* Not enough data (+2 == trailing \r\n) */
break;
} else {
- c->argv[c->argc++] = createStringObject(c->querybuf+pos,c->bulklen);
- pos += c->bulklen+2;
+ /* 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;
+ }
c->bulklen = -1;
c->multibulklen--;
}
}
/* Trim to pos */
- c->querybuf = sdsrange(c->querybuf,pos,-1);
+ if (pos) c->querybuf = sdsrange(c->querybuf,pos,-1);
/* We're done when c->multibulk == 0 */
if (c->multibulklen == 0) {
/* 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 || c->flags & REDIS_IO_WAIT) return;
+ 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
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