+/*
+ * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
#include "redis.h"
#include <sys/uio.h>
+static void setProtocolError(redisClient *c, int pos);
+
+/* To evaluate the output buffer size of a client we need to get size of
+ * allocated objects, however we can't used zmalloc_size() directly on sds
+ * strings because of the trick they use to work (the header is before the
+ * returned pointer), so we use this helper function. */
+size_t zmalloc_size_sds(sds s) {
+ return zmalloc_size(s-sizeof(struct sdshdr));
+}
+
void *dupClientReplyValue(void *o) {
incrRefCount((robj*)o);
return o;
}
redisClient *createClient(int fd) {
- redisClient *c;
-
- /* Make sure to allocate a multiple of the page size to prevent wasting
- * memory. A page size of 4096 is assumed here. We need to compensate
- * for the zmalloc overhead of sizeof(size_t) bytes. */
- size_t size = 8192-sizeof(size_t);
- redisAssert(size > sizeof(redisClient));
- c = zmalloc(size);
- c->buflen = size-sizeof(redisClient);
- c->bufpos = 0;
+ redisClient *c = zmalloc(sizeof(redisClient));
+
+ /* 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->bufpos = 0;
c->querybuf = sdsempty();
+ c->querybuf_peak = 0;
+ 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->ctime = c->lastinteraction = server.unixtime;
c->authenticated = 0;
c->replstate = REDIS_REPL_NONE;
+ c->slave_listening_port = 0;
c->reply = listCreate();
+ c->reply_bytes = 0;
+ c->obuf_soft_limit_reached_time = 0;
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;
}
-int _ensureFileEvent(redisClient *c) {
- if (c->fd <= 0) return REDIS_ERR;
+/* This function is called every time we are going to transmit new data
+ * to the client. The behavior is the following:
+ *
+ * If the client should receive new data (normal clients will) the function
+ * returns REDIS_OK, and make sure to install the write handler in our event
+ * loop so that when the socket is writable new data gets written.
+ *
+ * If the client should not receive new data, because it is a fake client
+ * or a slave, or because the setup of the write handler failed, the function
+ * returns REDIS_ERR.
+ *
+ * Typically gets called every time a reply is built, before adding more
+ * data to the clients output buffers. If the function returns REDIS_ERR no
+ * data should be appended to the output buffers. */
+int prepareClientToWrite(redisClient *c) {
+ if (c->flags & REDIS_LUA_CLIENT) return REDIS_OK;
+ if (c->fd <= 0) return REDIS_ERR; /* Fake client */
if (c->bufpos == 0 && listLength(c->reply) == 0 &&
(c->replstate == REDIS_REPL_NONE ||
c->replstate == REDIS_REPL_ONLINE) &&
return REDIS_OK;
}
-void _addReplyObjectToList(redisClient *c, robj *obj) {
- redisAssert(obj->type == REDIS_STRING &&
- obj->encoding == REDIS_ENCODING_RAW);
- listAddNodeTail(c->reply,obj);
+/* 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;
+ }
+ return listNodeValue(ln);
}
-void _ensureBufferInReplyList(redisClient *c) {
- sds buffer = sdsnewlen(NULL,REDIS_REPLY_CHUNK_SIZE);
- sdsupdatelen(buffer); /* sdsnewlen expects non-empty string */
- listAddNodeTail(c->reply,createObject(REDIS_REPLY_NODE,buffer));
+/* -----------------------------------------------------------------------------
+ * 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 _addReplyStringToBuffer(redisClient *c, char *s, size_t len) {
- size_t available = 0;
- redisAssert(len < REDIS_REPLY_CHUNK_THRESHOLD);
- if (listLength(c->reply) > 0) {
- robj *o = listNodeValue(listLast(c->reply));
+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);
+ c->reply_bytes += zmalloc_size_sds(o->ptr);
+ } else {
+ tail = listNodeValue(listLast(c->reply));
- /* Make sure to append to a reply node with enough bytes available. */
- if (o->type == REDIS_REPLY_NODE) available = sdsavail(o->ptr);
- if (o->type != REDIS_REPLY_NODE || len > available) {
- _ensureBufferInReplyList(c);
- _addReplyStringToBuffer(c,s,len);
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+sdslen(o->ptr) <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ c->reply_bytes -= zmalloc_size_sds(tail->ptr);
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,o->ptr,sdslen(o->ptr));
+ c->reply_bytes += zmalloc_size_sds(tail->ptr);
} else {
- o->ptr = sdscatlen(o->ptr,s,len);
+ incrRefCount(o);
+ listAddNodeTail(c->reply,o);
+ c->reply_bytes += zmalloc_size_sds(o->ptr);
}
+ }
+ asyncCloseClientOnOutputBufferLimitReached(c);
+}
+
+/* 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 (c->flags & REDIS_CLOSE_AFTER_REPLY) {
+ sdsfree(s);
+ return;
+ }
+
+ if (listLength(c->reply) == 0) {
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,s));
+ c->reply_bytes += zmalloc_size_sds(s);
} else {
- available = c->buflen-c->bufpos;
- if (len > available) {
- _ensureBufferInReplyList(c);
- _addReplyStringToBuffer(c,s,len);
+ tail = listNodeValue(listLast(c->reply));
+
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+sdslen(s) <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ c->reply_bytes -= zmalloc_size_sds(tail->ptr);
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,s,sdslen(s));
+ c->reply_bytes += zmalloc_size_sds(tail->ptr);
+ sdsfree(s);
} else {
- memcpy(c->buf+c->bufpos,s,len);
- c->bufpos += len;
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,s));
+ c->reply_bytes += zmalloc_size_sds(s);
}
}
+ asyncCloseClientOnOutputBufferLimitReached(c);
}
-void addReply(redisClient *c, robj *obj) {
- if (_ensureFileEvent(c) != REDIS_OK) return;
- if (server.vm_enabled && obj->storage != REDIS_VM_MEMORY) {
- /* Returns a new object with refcount 1 */
- obj = dupStringObject(obj);
+void _addReplyStringToList(redisClient *c, char *s, size_t len) {
+ robj *tail;
+
+ if (c->flags & REDIS_CLOSE_AFTER_REPLY) return;
+
+ if (listLength(c->reply) == 0) {
+ robj *o = createStringObject(s,len);
+
+ listAddNodeTail(c->reply,o);
+ c->reply_bytes += zmalloc_size_sds(o->ptr);
} else {
- /* This increments the refcount. */
- obj = getDecodedObject(obj);
+ tail = listNodeValue(listLast(c->reply));
+
+ /* Append to this object when possible. */
+ if (tail->ptr != NULL &&
+ sdslen(tail->ptr)+len <= REDIS_REPLY_CHUNK_BYTES)
+ {
+ c->reply_bytes -= zmalloc_size_sds(tail->ptr);
+ tail = dupLastObjectIfNeeded(c->reply);
+ tail->ptr = sdscatlen(tail->ptr,s,len);
+ c->reply_bytes += zmalloc_size_sds(tail->ptr);
+ } else {
+ robj *o = createStringObject(s,len);
+
+ listAddNodeTail(c->reply,o);
+ c->reply_bytes += zmalloc_size_sds(o->ptr);
+ }
}
+ asyncCloseClientOnOutputBufferLimitReached(c);
+}
+
+/* -----------------------------------------------------------------------------
+ * Higher level functions to queue data on the client output buffer.
+ * The following functions are the ones that commands implementations will call.
+ * -------------------------------------------------------------------------- */
- if (sdslen(obj->ptr) < REDIS_REPLY_CHUNK_THRESHOLD) {
- _addReplyStringToBuffer(c,obj->ptr,sdslen(obj->ptr));
+void addReply(redisClient *c, robj *obj) {
+ if (prepareClientToWrite(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 if (obj->encoding == REDIS_ENCODING_INT) {
+ /* Optimization: if there is room in the static buffer for 32 bytes
+ * (more than the max chars a 64 bit integer can take as string) we
+ * avoid decoding the object and go for the lower level approach. */
+ if (listLength(c->reply) == 0 && (sizeof(c->buf) - c->bufpos) >= 32) {
+ char buf[32];
+ int len;
+
+ len = ll2string(buf,sizeof(buf),(long)obj->ptr);
+ if (_addReplyToBuffer(c,buf,len) == REDIS_OK)
+ return;
+ /* else... continue with the normal code path, but should never
+ * happen actually since we verified there is room. */
+ }
+ obj = getDecodedObject(obj);
+ if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != REDIS_OK)
+ _addReplyObjectToList(c,obj);
decrRefCount(obj);
} else {
- _addReplyObjectToList(c,obj);
+ redisPanic("Wrong obj->encoding in addReply()");
}
}
void addReplySds(redisClient *c, sds s) {
- if (_ensureFileEvent(c) != REDIS_OK) {
+ if (prepareClientToWrite(c) != REDIS_OK) {
/* The caller expects the sds to be free'd. */
sdsfree(s);
return;
}
- if (sdslen(s) < REDIS_REPLY_CHUNK_THRESHOLD) {
- _addReplyStringToBuffer(c,s,sdslen(s));
+ if (_addReplyToBuffer(c,s,sdslen(s)) == REDIS_OK) {
sdsfree(s);
} else {
- _addReplyObjectToList(c,createObject(REDIS_STRING,s));
+ /* 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 (_ensureFileEvent(c) != REDIS_OK) return;
- if (len < REDIS_REPLY_CHUNK_THRESHOLD) {
- _addReplyStringToBuffer(c,s,len);
- } else {
- _addReplyObjectToList(c,createStringObject(s,len));
+ if (prepareClientToWrite(c) != REDIS_OK) return;
+ if (_addReplyToBuffer(c,s,len) != REDIS_OK)
+ _addReplyStringToList(c,s,len);
+}
+
+void addReplyErrorLength(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) {
+ addReplyErrorLength(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] = ' ';
}
+ addReplyErrorLength(c,s,sdslen(s));
+ sdsfree(s);
+}
+
+void addReplyStatusLength(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) {
+ addReplyStatusLength(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);
+ addReplyStatusLength(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) {
- if (_ensureFileEvent(c) != REDIS_OK) return NULL;
- _addReplyObjectToList(c,createObject(REDIS_STRING,NULL));
+ /* 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 (prepareClientToWrite(c) != REDIS_OK) return NULL;
+ listAddNodeTail(c->reply,createObject(REDIS_STRING,NULL));
return listLast(c->reply);
}
len = listNodeValue(ln);
len->ptr = sdscatprintf(sdsempty(),"*%ld\r\n",length);
+ c->reply_bytes += zmalloc_size_sds(len->ptr);
if (ln->next != NULL) {
next = listNodeValue(ln->next);
- /* Only glue when the next node is a reply chunk. */
- if (next->type == REDIS_REPLY_NODE) {
+
+ /* Only glue when the next node is non-NULL (an sds in this case) */
+ if (next->ptr != NULL) {
+ c->reply_bytes -= zmalloc_size_sds(len->ptr);
+ c->reply_bytes -= zmalloc_size_sds(next->ptr);
len->ptr = sdscatlen(len->ptr,next->ptr,sdslen(next->ptr));
+ c->reply_bytes += zmalloc_size_sds(len->ptr);
listDelNode(c->reply,ln->next);
}
}
+ asyncCloseClientOnOutputBufferLimitReached(c);
}
+/* Add a duble as a bulk reply */
void addReplyDouble(redisClient *c, double d) {
char dbuf[128], sbuf[128];
int dlen, slen;
addReplyString(c,sbuf,slen);
}
-void _addReplyLongLong(redisClient *c, long long ll, char prefix) {
+/* Add a long long as integer reply or bulk len / multi bulk count.
+ * Basically this is used to output <prefix><long long><crlf>. */
+void addReplyLongLongWithPrefix(redisClient *c, long long ll, char prefix) {
char buf[128];
int len;
+
+ /* Things like $3\r\n or *2\r\n are emitted very often by the protocol
+ * so we have a few shared objects to use if the integer is small
+ * like it is most of the times. */
+ if (prefix == '*' && ll < REDIS_SHARED_BULKHDR_LEN) {
+ addReply(c,shared.mbulkhdr[ll]);
+ return;
+ } else if (prefix == '$' && ll < REDIS_SHARED_BULKHDR_LEN) {
+ addReply(c,shared.bulkhdr[ll]);
+ return;
+ }
+
buf[0] = prefix;
len = ll2string(buf+1,sizeof(buf)-1,ll);
buf[len+1] = '\r';
}
void addReplyLongLong(redisClient *c, long long ll) {
- _addReplyLongLong(c,ll,':');
-}
-
-void addReplyUlong(redisClient *c, unsigned long ul) {
- _addReplyLongLong(c,(long long)ul,':');
+ if (ll == 0)
+ addReply(c,shared.czero);
+ else if (ll == 1)
+ addReply(c,shared.cone);
+ else
+ addReplyLongLongWithPrefix(c,ll,':');
}
void addReplyMultiBulkLen(redisClient *c, long length) {
- _addReplyLongLong(c,length,'*');
+ addReplyLongLongWithPrefix(c,length,'*');
}
+/* Create the length prefix of a bulk reply, example: $2234 */
void addReplyBulkLen(redisClient *c, robj *obj) {
size_t len;
len++;
}
}
- _addReplyLongLong(c,len,'$');
+ addReplyLongLongWithPrefix(c,len,'$');
}
+/* Add a Redis Object as a bulk reply */
void addReplyBulk(redisClient *c, robj *obj) {
addReplyBulkLen(c,obj);
addReply(c,obj);
addReply(c,shared.crlf);
}
-/* In the CONFIG command we need to add vanilla C string as bulk replies */
+/* Add a C buffer as bulk reply */
+void addReplyBulkCBuffer(redisClient *c, void *p, size_t len) {
+ addReplyLongLongWithPrefix(c,len,'$');
+ 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));
}
}
-void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
- int cport, cfd;
- char cip[128];
- redisClient *c;
- REDIS_NOTUSED(el);
- REDIS_NOTUSED(mask);
- REDIS_NOTUSED(privdata);
+/* Add a long long as a bulk reply */
+void addReplyBulkLongLong(redisClient *c, long long ll) {
+ char buf[64];
+ int len;
- cfd = anetAccept(server.neterr, fd, cip, &cport);
- if (cfd == AE_ERR) {
- redisLog(REDIS_VERBOSE,"Accepting client connection: %s", server.neterr);
- return;
- }
- redisLog(REDIS_VERBOSE,"Accepted %s:%d", cip, cport);
- if ((c = createClient(cfd)) == NULL) {
- redisLog(REDIS_WARNING,"Error allocating resoures for the client");
- close(cfd); /* May be already closed, just ingore errors */
+ len = ll2string(buf,64,ll);
+ addReplyBulkCBuffer(c,buf,len);
+}
+
+/* Copy 'src' client output buffers into 'dst' client output buffers.
+ * The function takes care of freeing the old output buffers of the
+ * destination client. */
+void copyClientOutputBuffer(redisClient *dst, redisClient *src) {
+ listRelease(dst->reply);
+ dst->reply = listDup(src->reply);
+ memcpy(dst->buf,src->buf,src->bufpos);
+ dst->bufpos = src->bufpos;
+ dst->reply_bytes = src->reply_bytes;
+}
+
+static void acceptCommonHandler(int fd, int flags) {
+ redisClient *c;
+ if ((c = createClient(fd)) == NULL) {
+ redisLog(REDIS_WARNING,"Error allocating resources for the client");
+ close(fd); /* May be already closed, just ignore errors */
return;
}
/* If maxclient directive is set and this is one client more... close the
* 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;
}
server.stat_numconnections++;
+ c->flags |= flags;
+}
+
+void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
+ int cport, cfd;
+ char cip[128];
+ REDIS_NOTUSED(el);
+ REDIS_NOTUSED(mask);
+ REDIS_NOTUSED(privdata);
+
+ cfd = anetTcpAccept(server.neterr, fd, cip, &cport);
+ if (cfd == AE_ERR) {
+ redisLog(REDIS_WARNING,"Accepting client connection: %s", server.neterr);
+ return;
+ }
+ redisLog(REDIS_VERBOSE,"Accepted %s:%d", cip, cport);
+ acceptCommonHandler(cfd,0);
+}
+
+void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
+ int cfd;
+ REDIS_NOTUSED(el);
+ REDIS_NOTUSED(mask);
+ REDIS_NOTUSED(privdata);
+
+ cfd = anetUnixAccept(server.neterr, fd);
+ if (cfd == AE_ERR) {
+ redisLog(REDIS_WARNING,"Accepting client connection: %s", server.neterr);
+ return;
+ }
+ redisLog(REDIS_VERBOSE,"Accepted connection to %s", server.unixsocket);
+ acceptCommonHandler(cfd,REDIS_UNIX_SOCKET);
}
+
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;
+}
+
+/* Close all the slaves connections. This is useful in chained replication
+ * when we resync with our own master and want to force all our slaves to
+ * resync with us as well. */
+void disconnectSlaves(void) {
+ while (listLength(server.slaves)) {
+ listNode *ln = listFirst(server.slaves);
+ freeClient((redisClient*)ln->value);
+ }
}
void freeClient(redisClient *c) {
listNode *ln;
+ /* If this is marked as current client unset it */
+ if (server.current_client == c) server.current_client = NULL;
+
/* Note that if the client we are freeing is blocked into a blocking
* call, we have to set querybuf to NULL *before* to call
* unblockClientWaitingData() to avoid processInputBuffer() will get
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.
/* Case 2: we lost the connection with the master. */
if (c->flags & REDIS_MASTER) {
server.master = NULL;
- server.replstate = REDIS_REPL_CONNECT;
- /* 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);
- }
+ server.repl_state = REDIS_REPL_CONNECT;
+ server.repl_down_since = server.unixtime;
+ /* We lost connection with our master, force our slaves to resync
+ * with us as well to load the new data set.
+ *
+ * If server.masterhost is NULL the user called SLAVEOF NO ONE so
+ * slave resync is not needed. */
+ if (server.masterhost != NULL) disconnectSlaves();
}
+
+ /* If this client was scheduled for async freeing we need to remove it
+ * from the queue. */
+ if (c->flags & REDIS_CLOSE_ASAP) {
+ ln = listSearchKey(server.clients_to_close,c);
+ redisAssert(ln != NULL);
+ listDelNode(server.clients_to_close,ln);
+ }
+
/* Release memory */
zfree(c->argv);
- zfree(c->mbargv);
freeClientMultiState(c);
zfree(c);
}
+/* Schedule a client to free it at a safe time in the serverCron() function.
+ * This function is useful when we need to terminate a client but we are in
+ * a context where calling freeClient() is not possible, because the client
+ * should be valid for the continuation of the flow of the program. */
+void freeClientAsync(redisClient *c) {
+ if (c->flags & REDIS_CLOSE_ASAP) return;
+ c->flags |= REDIS_CLOSE_ASAP;
+ listAddNodeTail(server.clients_to_close,c);
+}
+
+void freeClientsInAsyncFreeQueue(void) {
+ while (listLength(server.clients_to_close)) {
+ listNode *ln = listFirst(server.clients_to_close);
+ redisClient *c = listNodeValue(ln);
+
+ c->flags &= ~REDIS_CLOSE_ASAP;
+ freeClient(c);
+ listDelNode(server.clients_to_close,ln);
+ }
+}
+
void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = privdata;
int nwritten = 0, totwritten = 0, objlen;
+ size_t objmem;
robj *o;
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) {
} else {
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);
+ objmem = zmalloc_size_sds(o->ptr);
if (objlen == 0) {
listDelNode(c->reply,listFirst(c->reply));
if (c->sentlen == objlen) {
listDelNode(c->reply,listFirst(c->reply));
c->sentlen = 0;
+ c->reply_bytes -= objmem;
}
}
- /* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT
+ /* Note that we avoid to send more than REDIS_MAX_WRITE_PER_EVENT
* 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
- * scenario think about 'KEYS *' against the loopback interfae) */
- if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break;
+ * scenario think about 'KEYS *' against the loopback interface).
+ *
+ * However if we are over the maxmemory limit we ignore that and
+ * just deliver as much data as it is possible to deliver. */
+ if (totwritten > REDIS_MAX_WRITE_PER_EVENT &&
+ (server.maxmemory == 0 ||
+ zmalloc_used_memory() < server.maxmemory)) break;
}
if (nwritten == -1) {
if (errno == EAGAIN) {
return;
}
}
- if (totwritten > 0) c->lastinteraction = time(NULL);
- if (listLength(c->reply) == 0) {
+ if (totwritten > 0) c->lastinteraction = server.unixtime;
+ if (c->bufpos == 0 && 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);
}
}
-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);
+/* resetClient prepare the client to process the next command */
+void resetClient(redisClient *c) {
+ freeClientArgv(c);
+ 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);
+}
- listNode *node;
- while (listLength(c->reply)) {
- offset = c->sentlen;
- ion = 0;
- willwrite = 0;
+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) {
+ if (sdslen(c->querybuf) > REDIS_INLINE_MAX_SIZE) {
+ addReplyError(c,"Protocol error: too big inline request");
+ setProtocolError(c,0);
+ }
+ return REDIS_ERR;
+ }
- /* fill-in the iov[] array */
- for(node = listFirst(c->reply); node; node = listNextNode(node)) {
- o = listNodeValue(node);
- objlen = sdslen(o->ptr);
+ /* Split the input buffer up to the \r\n */
+ querylen = newline-(c->querybuf);
+ argv = sdssplitlen(c->querybuf,querylen," ",1,&argc);
- if (totwritten + objlen - offset > REDIS_MAX_WRITE_PER_EVENT)
- break;
+ /* Leave data after the first line of the query in the buffer */
+ c->querybuf = sdsrange(c->querybuf,querylen+2,-1);
- if(ion == REDIS_WRITEV_IOVEC_COUNT)
- break; /* no more iovecs */
+ /* Setup argv array on client structure */
+ if (c->argv) zfree(c->argv);
+ c->argv = zmalloc(sizeof(robj*)*argc);
- 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++;
+ /* 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;
+}
- if(willwrite == 0)
- break;
+/* Helper function. Trims query buffer to make the function that processes
+ * multi bulk requests idempotent. */
+static void setProtocolError(redisClient *c, int pos) {
+ if (server.verbosity >= REDIS_VERBOSE) {
+ sds client = getClientInfoString(c);
+ redisLog(REDIS_VERBOSE,
+ "Protocol error from client: %s", client);
+ sdsfree(client);
+ }
+ c->flags |= REDIS_CLOSE_AFTER_REPLY;
+ c->querybuf = sdsrange(c->querybuf,pos,-1);
+}
- /* 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;
+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) {
+ if (sdslen(c->querybuf) > REDIS_INLINE_MAX_SIZE) {
+ addReplyError(c,"Protocol error: too big mbulk count string");
+ setProtocolError(c,0);
}
- break;
+ return REDIS_ERR;
}
- totwritten += nwritten;
- offset = c->sentlen;
+ /* 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;
+ }
- /* remove written robjs from c->reply */
- while (nwritten && listLength(c->reply)) {
- o = listNodeValue(listFirst(c->reply));
- objlen = sdslen(o->ptr);
+ pos = (newline-c->querybuf)+2;
+ if (ll <= 0) {
+ c->querybuf = sdsrange(c->querybuf,pos,-1);
+ return REDIS_OK;
+ }
- if(nwritten >= objlen - offset) {
- listDelNode(c->reply, listFirst(c->reply));
- nwritten -= objlen - offset;
- c->sentlen = 0;
- } else {
- /* partial write */
- c->sentlen += nwritten;
+ 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) {
+ if (sdslen(c->querybuf) > REDIS_INLINE_MAX_SIZE) {
+ addReplyError(c,"Protocol error: too big bulk count string");
+ setProtocolError(c,0);
+ }
break;
}
- offset = 0;
- }
- }
- if (totwritten > 0)
- c->lastinteraction = time(NULL);
+ /* Buffer should also contain \n */
+ if (newline-(c->querybuf) > ((signed)sdslen(c->querybuf)-2))
+ break;
- if (listLength(c->reply) == 0) {
- c->sentlen = 0;
- aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
- }
-}
+ if (c->querybuf[pos] != '$') {
+ addReplyErrorFormat(c,
+ "Protocol error: expected '$', got '%c'",
+ c->querybuf[pos]);
+ setProtocolError(c,pos);
+ return REDIS_ERR;
+ }
-/* resetClient prepare the client to process the next command */
-void resetClient(redisClient *c) {
- freeClientArgv(c);
- c->bulklen = -1;
- c->multibulk = 0;
-}
+ 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;
+ }
-void closeTimedoutClients(void) {
- redisClient *c;
- listNode *ln;
- time_t now = time(NULL);
- listIter li;
+ 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;
+ }
- listRewind(server.clients,&li);
- while ((ln = listNext(&li)) != NULL) {
- c = listNodeValue(ln);
- 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) {
- addReply(c,shared.nullmultibulk);
- unblockClientWaitingData(c);
+ /* 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;
}
+ c->bulklen = -1;
+ c->multibulklen--;
}
}
-}
-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);
- }
- *p = '\0'; /* remove "\n" */
- if (*(p-1) == '\r') *(p-1) = '\0'; /* and "\r" if any */
- sdsupdatelen(query);
+ /* Trim to pos */
+ if (pos) c->querybuf = sdsrange(c->querybuf,pos,-1);
- /* Now we can split the query in arguments */
- argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
- sdsfree(query);
+ /* We're done when c->multibulk == 0 */
+ if (c->multibulklen == 0) return REDIS_OK;
- if (c->argv) zfree(c->argv);
- c->argv = zmalloc(sizeof(robj*)*argc);
+ /* Still not read to process the command */
+ return REDIS_ERR;
+}
- 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]);
- }
- }
- 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;
+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);
+ server.current_client = c;
+ 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 probability that the query
+ * buffer contains exactly the SDS string representing the object, even
+ * at the risk of requiring 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);
+ if (c->querybuf_peak < qblen) c->querybuf_peak = qblen;
+ 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);
- c->lastinteraction = time(NULL);
+ sdsIncrLen(c->querybuf,nread);
+ c->lastinteraction = server.unixtime;
} else {
+ server.current_client = NULL;
+ return;
+ }
+ if (sdslen(c->querybuf) > server.client_max_querybuf_len) {
+ sds ci = getClientInfoString(c), bytes = sdsempty();
+
+ bytes = sdscatrepr(bytes,c->querybuf,64);
+ redisLog(REDIS_WARNING,"Closing client that reached max query buffer length: %s (qbuf initial bytes: %s)", ci, bytes);
+ sdsfree(ci);
+ sdsfree(bytes);
+ freeClient(c);
return;
}
processInputBuffer(c);
+ server.current_client = NULL;
+}
+
+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 = 0; /* initialized to zero for the unix socket case. */
+ int emask;
+
+ if (!(client->flags & REDIS_UNIX_SOCKET))
+ anetPeerToString(client->fd,ip,&port);
+ 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 (client->flags & REDIS_CLOSE_ASAP) *p++ = 'A';
+ if (client->flags & REDIS_UNIX_SOCKET) *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 age=%ld idle=%ld flags=%s db=%d sub=%d psub=%d multi=%d qbuf=%lu qbuf-free=%lu obl=%lu oll=%lu omem=%lu events=%s cmd=%s",
+ (client->flags & REDIS_UNIX_SOCKET) ? server.unixsocket : ip,
+ port,client->fd,
+ (long)(server.unixtime - client->ctime),
+ (long)(server.unixtime - client->lastinteraction),
+ flags,
+ client->db->id,
+ (int) dictSize(client->pubsub_channels),
+ (int) listLength(client->pubsub_patterns),
+ (client->flags & REDIS_MULTI) ? client->mstate.count : -1,
+ (unsigned long) sdslen(client->querybuf),
+ (unsigned long) sdsavail(client->querybuf),
+ (unsigned long) client->bufpos,
+ (unsigned long) listLength(client->reply),
+ getClientOutputBufferMemoryUsage(client),
+ 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) {
+ sds cs;
+
+ client = listNodeValue(ln);
+ cs = getClientInfoString(client);
+ o = sdscatsds(o,cs);
+ sdsfree(cs);
+ 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);
+ }
+}
+
+/* This function returns the number of bytes that Redis is virtually
+ * using to store the reply still not read by the client.
+ * It is "virtual" since the reply output list may contain objects that
+ * are shared and are not really using additional memory.
+ *
+ * The function returns the total sum of the length of all the objects
+ * stored in the output list, plus the memory used to allocate every
+ * list node. The static reply buffer is not taken into account since it
+ * is allocated anyway.
+ *
+ * Note: this function is very fast so can be called as many time as
+ * the caller wishes. The main usage of this function currently is
+ * enforcing the client output length limits. */
+unsigned long getClientOutputBufferMemoryUsage(redisClient *c) {
+ unsigned long list_item_size = sizeof(listNode)+sizeof(robj);
+
+ return c->reply_bytes + (list_item_size*listLength(c->reply));
+}
+
+/* Get the class of a client, used in order to enforce limits to different
+ * classes of clients.
+ *
+ * The function will return one of the following:
+ * REDIS_CLIENT_LIMIT_CLASS_NORMAL -> Normal client
+ * REDIS_CLIENT_LIMIT_CLASS_SLAVE -> Slave or client executing MONITOR command
+ * REDIS_CLIENT_LIMIT_CLASS_PUBSUB -> Client subscribed to Pub/Sub channels
+ */
+int getClientLimitClass(redisClient *c) {
+ if (c->flags & REDIS_SLAVE) return REDIS_CLIENT_LIMIT_CLASS_SLAVE;
+ if (dictSize(c->pubsub_channels) || listLength(c->pubsub_patterns))
+ return REDIS_CLIENT_LIMIT_CLASS_PUBSUB;
+ return REDIS_CLIENT_LIMIT_CLASS_NORMAL;
+}
+
+int getClientLimitClassByName(char *name) {
+ if (!strcasecmp(name,"normal")) return REDIS_CLIENT_LIMIT_CLASS_NORMAL;
+ else if (!strcasecmp(name,"slave")) return REDIS_CLIENT_LIMIT_CLASS_SLAVE;
+ else if (!strcasecmp(name,"pubsub")) return REDIS_CLIENT_LIMIT_CLASS_PUBSUB;
+ else return -1;
+}
+
+char *getClientLimitClassName(int class) {
+ switch(class) {
+ case REDIS_CLIENT_LIMIT_CLASS_NORMAL: return "normal";
+ case REDIS_CLIENT_LIMIT_CLASS_SLAVE: return "slave";
+ case REDIS_CLIENT_LIMIT_CLASS_PUBSUB: return "pubsub";
+ default: return NULL;
+ }
+}
+
+/* The function checks if the client reached output buffer soft or hard
+ * limit, and also update the state needed to check the soft limit as
+ * a side effect.
+ *
+ * Return value: non-zero if the client reached the soft or the hard limit.
+ * Otherwise zero is returned. */
+int checkClientOutputBufferLimits(redisClient *c) {
+ int soft = 0, hard = 0, class;
+ unsigned long used_mem = getClientOutputBufferMemoryUsage(c);
+
+ class = getClientLimitClass(c);
+ if (server.client_obuf_limits[class].hard_limit_bytes &&
+ used_mem >= server.client_obuf_limits[class].hard_limit_bytes)
+ hard = 1;
+ if (server.client_obuf_limits[class].soft_limit_bytes &&
+ used_mem >= server.client_obuf_limits[class].soft_limit_bytes)
+ soft = 1;
+
+ /* We need to check if the soft limit is reached continuously for the
+ * specified amount of seconds. */
+ if (soft) {
+ if (c->obuf_soft_limit_reached_time == 0) {
+ c->obuf_soft_limit_reached_time = server.unixtime;
+ soft = 0; /* First time we see the soft limit reached */
+ } else {
+ time_t elapsed = server.unixtime - c->obuf_soft_limit_reached_time;
+
+ if (elapsed <=
+ server.client_obuf_limits[class].soft_limit_seconds) {
+ soft = 0; /* The client still did not reached the max number of
+ seconds for the soft limit to be considered
+ reached. */
+ }
+ }
+ } else {
+ c->obuf_soft_limit_reached_time = 0;
+ }
+ return soft || hard;
+}
+
+/* Asynchronously close a client if soft or hard limit is reached on the
+ * output buffer size. The caller can check if the client will be closed
+ * checking if the client REDIS_CLOSE_ASAP flag is set.
+ *
+ * Note: we need to close the client asynchronously because this function is
+ * called from contexts where the client can't be freed safely, i.e. from the
+ * lower level functions pushing data inside the client output buffers. */
+void asyncCloseClientOnOutputBufferLimitReached(redisClient *c) {
+ redisAssert(c->reply_bytes < ULONG_MAX-(1024*64));
+ if (c->reply_bytes == 0 || c->flags & REDIS_CLOSE_ASAP) return;
+ if (checkClientOutputBufferLimits(c)) {
+ sds client = getClientInfoString(c);
+
+ freeClientAsync(c);
+ redisLog(REDIS_WARNING,"Client %s scheduled to be closed ASAP for overcoming of output buffer limits.", client);
+ sdsfree(client);
+ }
+}
+
+/* Helper function used by freeMemoryIfNeeded() in order to flush slaves
+ * output buffers without returning control to the event loop. */
+void flushSlavesOutputBuffers(void) {
+ listIter li;
+ listNode *ln;
+
+ listRewind(server.slaves,&li);
+ while((ln = listNext(&li))) {
+ redisClient *slave = listNodeValue(ln);
+ int events;
+
+ events = aeGetFileEvents(server.el,slave->fd);
+ if (events & AE_WRITABLE &&
+ slave->replstate == REDIS_REPL_ONLINE &&
+ listLength(slave->reply))
+ {
+ sendReplyToClient(server.el,slave->fd,slave,0);
+ }
+ }
}
projects / redis.git / blobdiff