}
redisClient *createClient(int fd) {
- redisClient *c;
-
- /* Allocate more space to hold a static write buffer. */
- c = zmalloc(sizeof(redisClient)+REDIS_REPLY_CHUNK_BYTES);
- c->buflen = REDIS_REPLY_CHUNK_BYTES;
+ 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;
+ }
+
selectDb(c,0);
c->fd = fd;
c->querybuf = sdsempty();
+ c->reqtype = 0;
c->argc = 0;
c->argv = 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->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);
initClientMultiState(c);
return c;
}
-int _ensureFileEvent(redisClient *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->fd <= 0) return REDIS_ERR;
if (c->bufpos == 0 && listLength(c->reply) == 0 &&
(c->replstate == REDIS_REPL_NONE ||
}
int _addReplyToBuffer(redisClient *c, char *s, size_t len) {
- size_t available = c->buflen-c->bufpos;
+ size_t available = sizeof(c->buf)-c->bufpos;
/* If there already are entries in the reply list, we cannot
* add anything more to the static buffer. */
}
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);
+ if (_installWriteEvent(c) != REDIS_OK) return;
+ redisAssert(!server.vm_enabled || obj->storage == REDIS_VM_MEMORY);
+
+ /* 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 {
- /* This increments the refcount. */
obj = getDecodedObject(obj);
+ if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != REDIS_OK)
+ _addReplyObjectToList(c,obj);
+ decrRefCount(obj);
}
- if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != REDIS_OK)
- _addReplyObjectToList(c,obj);
- decrRefCount(obj);
}
void addReplySds(redisClient *c, sds s) {
- if (_ensureFileEvent(c) != REDIS_OK) {
+ if (_installWriteEvent(c) != REDIS_OK) {
/* The caller expects the sds to be free'd. */
sdsfree(s);
return;
}
void addReplyString(redisClient *c, char *s, size_t len) {
- if (_ensureFileEvent(c) != REDIS_OK) return;
+ 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, ...) {
+ va_list ap;
+ va_start(ap,fmt);
+ sds s = sdscatvprintf(sdsempty(),fmt,ap);
+ va_end(ap);
+ _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) {
- if (_ensureFileEvent(c) != REDIS_OK) return 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 (_installWriteEvent(c) != REDIS_OK) return NULL;
listAddNodeTail(c->reply,createObject(REDIS_STRING,NULL));
return listLast(c->reply);
}
if (ln->next != NULL) {
next = listNodeValue(ln->next);
- /* Only glue when the next node is an sds */
+ /* Only glue when the next node is non-NULL (an sds in this case) */
if (next->ptr != NULL) {
- len->ptr = sdscat(len->ptr,next->ptr);
+ len->ptr = sdscatlen(len->ptr,next->ptr,sdslen(next->ptr));
listDelNode(c->reply,ln->next);
}
}
}
}
-void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
- int cport, cfd;
- char cip[128];
+static void acceptCommonHandler(int fd) {
redisClient *c;
- REDIS_NOTUSED(el);
- REDIS_NOTUSED(mask);
- REDIS_NOTUSED(privdata);
-
- 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) {
+ if ((c = createClient(fd)) == NULL) {
redisLog(REDIS_WARNING,"Error allocating resoures for the client");
- close(cfd); /* May be already closed, just ingore errors */
+ close(fd); /* May be already closed, just ingore errors */
return;
}
/* If maxclient directive is set and this is one client more... close the
server.stat_numconnections++;
}
+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_VERBOSE,"Accepting client connection: %s", server.neterr);
+ return;
+ }
+ redisLog(REDIS_VERBOSE,"Accepted %s:%d", cip, cport);
+ acceptCommonHandler(cfd);
+}
+
+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_VERBOSE,"Accepting client connection: %s", server.neterr);
+ return;
+ }
+ redisLog(REDIS_VERBOSE,"Accepted connection to %s", server.unixsocket);
+ acceptCommonHandler(cfd);
+}
+
+
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;
}
void freeClient(redisClient *c) {
/* Case 2: we lost the connection with the master. */
if (c->flags & REDIS_MASTER) {
server.master = NULL;
+ /* FIXME */
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
}
/* Release memory */
zfree(c->argv);
- zfree(c->mbargv);
freeClientMultiState(c);
zfree(c);
}
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;
}
void closeTimedoutClients(void) {
}
}
-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);
-
- /* Now we can split the query in arguments */
- argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
- sdsfree(query);
-
- if (c->argv) zfree(c->argv);
- c->argv = zmalloc(sizeof(robj*)*argc);
-
- 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]);
+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;
+ char *eptr;
+ int pos = 0, tolerr;
+ long bulklen;
+
+ if (c->multibulklen == 0) {
+ /* The client should have been reset */
+ redisAssert(c->argc == 0);
+
+ /* Multi bulk length cannot be read without a \r\n */
+ newline = strstr(c->querybuf,"\r\n");
+ if (newline == NULL)
+ 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) {
+ addReplyError(c,"Protocol error: invalid multibulk length");
+ setProtocolError(c,pos);
+ return REDIS_ERR;
+ }
+
+ /* 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);
+ 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;
}
+
+ bulklen = strtol(c->querybuf+pos+1,&eptr,10);
+ tolerr = (eptr[0] != '\r');
+ if (tolerr || bulklen == LONG_MIN || bulklen == LONG_MAX ||
+ bulklen < 0 || bulklen > 1024*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 */
+ break;
}
- 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;
+ }
+
+ /* Read bulk argument */
+ if (sdslen(c->querybuf)-pos < (unsigned)(c->bulklen+2)) {
+ /* Not enough data (+2 == trailing \r\n) */
+ break;
+ } 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);
+
+ /* 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 || c->flags & REDIS_IO_WAIT) 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);
}
}
}
return;
}
if (nread) {
- c->querybuf = sdscatlen(c->querybuf, buf, nread);
+ c->querybuf = sdscatlen(c->querybuf,buf,nread);
c->lastinteraction = time(NULL);
} else {
return;
projects / redis.git / blobdiff