2010-05-18 15:45:36 +00:00
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/*
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* Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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2010-05-18 15:11:09 +00:00
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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2010-09-20 16:02:28 +00:00
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#include <assert.h>
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2010-05-18 15:11:09 +00:00
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#include "hiredis.h"
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#include "anet.h"
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#include "sds.h"
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2010-09-19 16:47:05 +00:00
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typedef struct redisReader {
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2010-09-20 20:04:35 +00:00
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struct redisReplyObjectFunctions *fn;
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2010-09-20 16:02:28 +00:00
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void *reply; /* holds temporary reply */
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2010-09-20 07:50:19 +00:00
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sds buf; /* read buffer */
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unsigned int pos; /* buffer cursor */
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2010-09-19 16:47:05 +00:00
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2010-09-20 16:02:28 +00:00
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redisReadTask *rlist; /* list of items to process */
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2010-09-20 07:50:19 +00:00
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unsigned int rlen; /* list length */
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unsigned int rpos; /* list cursor */
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2010-09-19 16:47:05 +00:00
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} redisReader;
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2010-05-18 15:11:09 +00:00
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static redisReply *redisReadReply(int fd);
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static redisReply *createReplyObject(int type, sds reply);
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2010-09-20 16:18:25 +00:00
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static void *createErrorObject(redisReader *context, const char *fmt, ...);
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static void *createStringObject(redisReadTask *task, char *str, size_t len);
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static void *createArrayObject(redisReadTask *task, int elements);
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static void *createIntegerObject(redisReadTask *task, long long value);
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static void *createNilObject(redisReadTask *task);
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static void redisSetReplyReaderError(redisReader *r, void *obj);
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2010-05-18 15:11:09 +00:00
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2010-09-20 20:04:35 +00:00
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/* Default set of functions to build the reply. */
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static redisReplyFunctions defaultFunctions = {
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createStringObject,
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createArrayObject,
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createIntegerObject,
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createNilObject,
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freeReplyObject
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};
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2010-05-18 15:11:09 +00:00
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/* We simply abort on out of memory */
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static void redisOOM(void) {
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fprintf(stderr,"Out of memory in hiredis.c");
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exit(1);
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}
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/* Connect to a Redis instance. On success NULL is returned and *fd is set
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* to the socket file descriptor. On error a redisReply object is returned
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* with reply->type set to REDIS_REPLY_ERROR and reply->string containing
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* the error message. This replyObject must be freed with redisFreeReply(). */
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2010-05-25 11:56:18 +00:00
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redisReply *redisConnect(int *fd, const char *ip, int port) {
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2010-05-18 15:11:09 +00:00
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char err[ANET_ERR_LEN];
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*fd = anetTcpConnect(err,ip,port);
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if (*fd == ANET_ERR)
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2010-09-20 16:18:25 +00:00
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return (redisReply*)createErrorObject(NULL,err);
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2010-05-18 15:11:09 +00:00
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anetTcpNoDelay(NULL,*fd);
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return NULL;
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}
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/* Create a reply object */
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static redisReply *createReplyObject(int type, sds reply) {
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2010-09-19 17:01:31 +00:00
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redisReply *r = calloc(sizeof(*r),1);
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2010-05-18 15:11:09 +00:00
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if (!r) redisOOM();
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r->type = type;
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r->reply = reply;
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return r;
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}
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/* Free a reply object */
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2010-09-20 20:04:35 +00:00
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void freeReplyObject(void *reply) {
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redisReply *r = reply;
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2010-05-18 15:11:09 +00:00
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size_t j;
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switch(r->type) {
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case REDIS_REPLY_INTEGER:
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break; /* Nothing to free */
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case REDIS_REPLY_ARRAY:
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for (j = 0; j < r->elements; j++)
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2010-09-20 16:02:28 +00:00
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if (r->element[j]) freeReplyObject(r->element[j]);
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2010-05-18 15:11:09 +00:00
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free(r->element);
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break;
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default:
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2010-09-19 17:01:31 +00:00
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if (r->reply != NULL)
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sdsfree(r->reply);
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2010-05-18 15:11:09 +00:00
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break;
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}
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free(r);
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}
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2010-09-20 16:18:25 +00:00
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static void *createErrorObject(redisReader *context, const char *fmt, ...) {
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2010-09-20 12:05:23 +00:00
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va_list ap;
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sds err;
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2010-09-20 16:18:25 +00:00
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void *obj;
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redisReadTask t = { REDIS_PROTOCOL_ERROR, NULL, -1 };
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2010-09-20 12:05:23 +00:00
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va_start(ap,fmt);
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err = sdscatvprintf(sdsempty(),fmt,ap);
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va_end(ap);
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2010-09-20 20:04:35 +00:00
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/* Use the context of the reader if it is provided. */
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if (context)
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obj = context->fn->createString(&t,err,sdslen(err));
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else
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obj = createStringObject(&t,err,sdslen(err));
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2010-09-20 16:18:25 +00:00
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sdsfree(err);
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return obj;
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2010-05-18 15:11:09 +00:00
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}
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2010-09-20 16:02:28 +00:00
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static void *createStringObject(redisReadTask *task, char *str, size_t len) {
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redisReply *r = createReplyObject(task->type,sdsnewlen(str,len));
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2010-09-20 16:18:25 +00:00
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assert(task->type == REDIS_PROTOCOL_ERROR ||
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task->type == REDIS_REPLY_ERROR ||
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2010-09-20 16:02:28 +00:00
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task->type == REDIS_REPLY_STATUS ||
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task->type == REDIS_REPLY_STRING);
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/* for API compat, set STATUS to STRING */
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if (task->type == REDIS_REPLY_STATUS)
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r->type = REDIS_REPLY_STRING;
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if (task->parent) {
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redisReply *parent = task->parent;
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assert(parent->type == REDIS_REPLY_ARRAY);
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parent->element[task->idx] = r;
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}
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return r;
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}
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static void *createArrayObject(redisReadTask *task, int elements) {
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redisReply *r = createReplyObject(REDIS_REPLY_ARRAY,NULL);
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r->elements = elements;
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if ((r->element = calloc(sizeof(redisReply*),elements)) == NULL)
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redisOOM();
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if (task->parent) {
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redisReply *parent = task->parent;
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assert(parent->type == REDIS_REPLY_ARRAY);
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parent->element[task->idx] = r;
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}
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return r;
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}
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static void *createIntegerObject(redisReadTask *task, long long value) {
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redisReply *r = createReplyObject(REDIS_REPLY_INTEGER,NULL);
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r->integer = value;
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if (task->parent) {
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redisReply *parent = task->parent;
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assert(parent->type == REDIS_REPLY_ARRAY);
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parent->element[task->idx] = r;
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}
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return r;
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}
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static void *createNilObject(redisReadTask *task) {
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redisReply *r = createReplyObject(REDIS_REPLY_NIL,NULL);
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if (task->parent) {
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redisReply *parent = task->parent;
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assert(parent->type == REDIS_REPLY_ARRAY);
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parent->element[task->idx] = r;
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}
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return r;
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}
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2010-09-20 07:50:19 +00:00
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static char *readBytes(redisReader *r, unsigned int bytes) {
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2010-09-19 16:47:05 +00:00
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char *p;
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2010-09-20 07:50:19 +00:00
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if (sdslen(r->buf)-r->pos >= bytes) {
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2010-09-19 16:47:05 +00:00
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p = r->buf+r->pos;
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r->pos += bytes;
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return p;
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}
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return NULL;
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}
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2010-05-18 15:11:09 +00:00
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2010-09-19 16:47:05 +00:00
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static char *readLine(redisReader *r, int *_len) {
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char *p, *s = strstr(r->buf+r->pos,"\r\n");
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int len;
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if (s != NULL) {
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p = r->buf+r->pos;
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len = s-(r->buf+r->pos);
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r->pos += len+2; /* skip \r\n */
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if (_len) *_len = len;
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return p;
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}
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return NULL;
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}
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static int processLineItem(redisReader *r) {
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2010-09-20 16:02:28 +00:00
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redisReadTask *cur = &(r->rlist[r->rpos]);
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void *obj;
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2010-09-19 16:47:05 +00:00
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char *p;
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int len;
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2010-05-18 15:11:09 +00:00
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2010-09-19 16:47:05 +00:00
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if ((p = readLine(r,&len)) != NULL) {
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if (cur->type == REDIS_REPLY_INTEGER) {
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createInteger(cur,strtoll(p,NULL,10));
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2010-05-18 15:11:09 +00:00
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} else {
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createString(cur,p,len);
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2010-05-18 15:11:09 +00:00
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}
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2010-09-19 16:47:05 +00:00
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2010-09-20 16:02:28 +00:00
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/* If there is no root yet, register this object as root. */
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if (r->reply == NULL)
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r->reply = obj;
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2010-09-19 16:47:05 +00:00
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r->rpos++;
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return 0;
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2010-05-18 15:11:09 +00:00
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}
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2010-09-19 16:47:05 +00:00
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return -1;
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2010-05-18 15:11:09 +00:00
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}
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2010-09-19 16:47:05 +00:00
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static int processBulkItem(redisReader *r) {
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2010-09-20 16:02:28 +00:00
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redisReadTask *cur = &(r->rlist[r->rpos]);
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void *obj = NULL;
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char *p, *s;
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long len;
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unsigned long bytelen;
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p = r->buf+r->pos;
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s = strstr(p,"\r\n");
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if (s != NULL) {
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p = r->buf+r->pos;
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bytelen = s-(r->buf+r->pos)+2; /* include \r\n */
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len = strtol(p,NULL,10);
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2010-05-18 15:11:09 +00:00
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2010-09-20 16:02:28 +00:00
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if (len < 0) {
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/* The nil object can always be created. */
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createNil(cur);
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2010-09-19 16:47:05 +00:00
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} else {
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2010-09-20 16:02:28 +00:00
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/* Only continue when the buffer contains the entire bulk item. */
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bytelen += len+2; /* include \r\n */
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if (r->pos+bytelen <= sdslen(r->buf)) {
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createString(cur,s+2,len);
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2010-09-20 16:02:28 +00:00
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}
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2010-09-19 16:47:05 +00:00
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}
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2010-05-18 15:11:09 +00:00
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2010-09-20 16:02:28 +00:00
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/* Proceed when obj was created. */
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if (obj != NULL) {
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r->pos += bytelen;
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if (r->reply == NULL)
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r->reply = obj;
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r->rpos++;
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return 0;
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}
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2010-08-30 13:42:24 +00:00
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}
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2010-09-19 16:47:05 +00:00
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return -1;
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2010-05-18 15:11:09 +00:00
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}
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2010-09-19 16:47:05 +00:00
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static int processMultiBulkItem(redisReader *r) {
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2010-09-20 16:02:28 +00:00
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redisReadTask *cur = &(r->rlist[r->rpos]);
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void *obj;
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2010-09-19 16:47:05 +00:00
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char *p;
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2010-09-20 16:02:28 +00:00
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long elements, j;
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2010-05-18 15:11:09 +00:00
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2010-09-19 16:47:05 +00:00
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if ((p = readLine(r,NULL)) != NULL) {
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2010-09-20 16:02:28 +00:00
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elements = strtol(p,NULL,10);
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2010-09-19 16:47:05 +00:00
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if (elements == -1) {
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createNil(cur);
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2010-09-20 16:02:28 +00:00
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} else {
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2010-09-20 20:04:35 +00:00
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obj = r->fn->createArray(cur,elements);
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2010-09-20 16:02:28 +00:00
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/* Modify read list when there are more than 0 elements. */
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if (elements > 0) {
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/* Append elements to the read list. */
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r->rlen += elements;
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if ((r->rlist = realloc(r->rlist,sizeof(redisReadTask)*r->rlen)) == NULL)
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redisOOM();
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/* Move existing items backwards. */
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memmove(&(r->rlist[r->rpos+1+elements]),
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&(r->rlist[r->rpos+1]),
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(r->rlen-(r->rpos+1+elements))*sizeof(redisReadTask));
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/* Populate new read items. */
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redisReadTask *t;
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for (j = 0; j < elements; j++) {
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t = &(r->rlist[r->rpos+1+j]);
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t->type = -1;
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t->parent = obj;
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t->idx = j;
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}
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|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (obj != NULL) {
|
|
|
|
if (r->reply == NULL)
|
|
|
|
r->reply = obj;
|
2010-09-19 16:47:05 +00:00
|
|
|
r->rpos++;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
2010-09-20 16:02:28 +00:00
|
|
|
return -1;
|
2010-05-18 15:11:09 +00:00
|
|
|
}
|
|
|
|
|
2010-09-19 16:47:05 +00:00
|
|
|
static int processItem(redisReader *r) {
|
2010-09-20 16:02:28 +00:00
|
|
|
redisReadTask *cur = &(r->rlist[r->rpos]);
|
2010-09-19 16:47:05 +00:00
|
|
|
char *p;
|
2010-09-20 12:05:23 +00:00
|
|
|
sds byte;
|
2010-09-19 16:47:05 +00:00
|
|
|
|
|
|
|
/* check if we need to read type */
|
|
|
|
if (cur->type < 0) {
|
|
|
|
if ((p = readBytes(r,1)) != NULL) {
|
|
|
|
switch (p[0]) {
|
|
|
|
case '-':
|
|
|
|
cur->type = REDIS_REPLY_ERROR;
|
|
|
|
break;
|
|
|
|
case '+':
|
|
|
|
cur->type = REDIS_REPLY_STATUS;
|
|
|
|
break;
|
|
|
|
case ':':
|
|
|
|
cur->type = REDIS_REPLY_INTEGER;
|
|
|
|
break;
|
|
|
|
case '$':
|
|
|
|
cur->type = REDIS_REPLY_STRING;
|
|
|
|
break;
|
|
|
|
case '*':
|
|
|
|
cur->type = REDIS_REPLY_ARRAY;
|
|
|
|
break;
|
|
|
|
default:
|
2010-09-20 12:05:23 +00:00
|
|
|
byte = sdscatrepr(sdsempty(),p,1);
|
2010-09-20 16:18:25 +00:00
|
|
|
redisSetReplyReaderError(r,createErrorObject(r,
|
2010-09-20 12:05:23 +00:00
|
|
|
"protocol error, got %s as reply type byte", byte));
|
|
|
|
sdsfree(byte);
|
|
|
|
return -1;
|
2010-09-19 16:47:05 +00:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* could not consume 1 byte */
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* process typed item */
|
|
|
|
switch(cur->type) {
|
|
|
|
case REDIS_REPLY_ERROR:
|
|
|
|
case REDIS_REPLY_STATUS:
|
|
|
|
case REDIS_REPLY_INTEGER:
|
|
|
|
return processLineItem(r);
|
|
|
|
case REDIS_REPLY_STRING:
|
|
|
|
return processBulkItem(r);
|
|
|
|
case REDIS_REPLY_ARRAY:
|
|
|
|
return processMultiBulkItem(r);
|
2010-05-18 15:11:09 +00:00
|
|
|
default:
|
2010-09-20 16:18:25 +00:00
|
|
|
redisSetReplyReaderError(r,createErrorObject(r,
|
2010-09-20 12:05:23 +00:00
|
|
|
"unknown item type '%d'", cur->type));
|
|
|
|
return -1;
|
2010-05-18 15:11:09 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-09-19 16:47:05 +00:00
|
|
|
#define READ_BUFFER_SIZE 2048
|
|
|
|
static redisReply *redisReadReply(int fd) {
|
2010-09-20 20:04:35 +00:00
|
|
|
void *reader = redisCreateReplyReader(&defaultFunctions);
|
2010-09-19 18:41:03 +00:00
|
|
|
redisReply *reply;
|
2010-09-20 07:50:19 +00:00
|
|
|
char buf[1024];
|
|
|
|
int nread;
|
|
|
|
|
|
|
|
do {
|
|
|
|
if ((nread = read(fd,buf,sizeof(buf))) <= 0) {
|
2010-09-20 16:18:25 +00:00
|
|
|
reply = createErrorObject(reader,"I/O error");
|
2010-09-20 07:50:19 +00:00
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
reply = redisFeedReplyReader(reader,buf,nread);
|
2010-09-19 16:47:05 +00:00
|
|
|
}
|
2010-09-20 07:50:19 +00:00
|
|
|
} while (reply == NULL);
|
|
|
|
|
|
|
|
redisFreeReplyReader(reader);
|
|
|
|
return reply;
|
|
|
|
}
|
|
|
|
|
2010-09-20 20:04:35 +00:00
|
|
|
void *redisCreateReplyReader(redisReplyFunctions *fn) {
|
2010-09-20 07:50:19 +00:00
|
|
|
redisReader *r = calloc(sizeof(redisReader),1);
|
2010-09-20 20:04:35 +00:00
|
|
|
r->fn = fn == NULL ? &defaultFunctions : fn;
|
2010-09-20 07:50:19 +00:00
|
|
|
r->buf = sdsempty();
|
2010-09-20 16:02:28 +00:00
|
|
|
r->rlist = malloc(sizeof(redisReadTask)*1);
|
2010-09-20 07:50:19 +00:00
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
2010-09-20 20:04:35 +00:00
|
|
|
/* External libraries wrapping hiredis might need access to the temporary
|
|
|
|
* variable while the reply is built up. When the reader contains an
|
|
|
|
* object in between receiving some bytes to parse, this object might
|
|
|
|
* otherwise be free'd by garbage collection. */
|
|
|
|
void *redisGetReplyObjectFromReplyReader(void *reader) {
|
|
|
|
redisReader *r = reader;
|
|
|
|
return r->reply;
|
|
|
|
}
|
|
|
|
|
2010-09-20 07:50:19 +00:00
|
|
|
void redisFreeReplyReader(void *reader) {
|
|
|
|
redisReader *r = reader;
|
2010-09-20 16:02:28 +00:00
|
|
|
if (r->reply != NULL)
|
2010-09-20 20:04:35 +00:00
|
|
|
r->fn->freeObject(r->reply);
|
2010-09-20 16:02:28 +00:00
|
|
|
if (r->buf != NULL)
|
2010-09-20 07:50:19 +00:00
|
|
|
sdsfree(r->buf);
|
2010-09-20 16:02:28 +00:00
|
|
|
if (r->rlist != NULL)
|
2010-09-20 07:50:19 +00:00
|
|
|
free(r->rlist);
|
|
|
|
free(r);
|
|
|
|
}
|
|
|
|
|
2010-09-20 13:26:18 +00:00
|
|
|
int redisIsReplyReaderEmpty(void *reader) {
|
|
|
|
redisReader *r = reader;
|
2010-09-20 16:02:28 +00:00
|
|
|
if ((r->buf != NULL && sdslen(r->buf) > 0) ||
|
|
|
|
(r->rpos < r->rlen)) return 0;
|
2010-09-20 13:26:18 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2010-09-20 16:18:25 +00:00
|
|
|
static void redisSetReplyReaderError(redisReader *r, void *obj) {
|
2010-09-20 16:02:28 +00:00
|
|
|
if (r->reply != NULL)
|
2010-09-20 20:04:35 +00:00
|
|
|
r->fn->freeObject(r->reply);
|
2010-09-20 16:02:28 +00:00
|
|
|
|
2010-09-20 12:05:23 +00:00
|
|
|
/* Clear remaining buffer when we see a protocol error. */
|
|
|
|
if (r->buf != NULL) {
|
|
|
|
sdsfree(r->buf);
|
|
|
|
r->buf = sdsempty();
|
|
|
|
r->pos = 0;
|
|
|
|
}
|
2010-09-20 16:02:28 +00:00
|
|
|
r->rlen = r->rpos = 0;
|
2010-09-20 16:18:25 +00:00
|
|
|
r->reply = obj;
|
2010-09-20 12:05:23 +00:00
|
|
|
}
|
|
|
|
|
2010-09-20 07:50:19 +00:00
|
|
|
void *redisFeedReplyReader(void *reader, char *buf, int len) {
|
|
|
|
redisReader *r = reader;
|
|
|
|
|
|
|
|
/* Check if we are able to do *something*. */
|
|
|
|
if (sdslen(r->buf) == 0 && (buf == NULL || len <= 0))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/* Copy the provided buffer. */
|
|
|
|
if (buf != NULL && len >= 1)
|
|
|
|
r->buf = sdscatlen(r->buf,buf,len);
|
|
|
|
|
|
|
|
/* Create first item to process when the item list is empty. */
|
|
|
|
if (r->rlen == 0) {
|
2010-09-20 16:02:28 +00:00
|
|
|
r->rlist = realloc(r->rlist,sizeof(redisReadTask)*1);
|
|
|
|
r->rlist[0].type = -1;
|
|
|
|
r->rlist[0].parent = NULL;
|
|
|
|
r->rlist[0].idx = -1;
|
2010-09-20 07:50:19 +00:00
|
|
|
r->rlen = 1;
|
|
|
|
r->rpos = 0;
|
|
|
|
}
|
2010-09-19 16:47:05 +00:00
|
|
|
|
2010-09-20 07:50:19 +00:00
|
|
|
/* Process items in reply. */
|
|
|
|
while (r->rpos < r->rlen)
|
|
|
|
if (processItem(r) < 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* Discard the consumed part of the buffer. */
|
|
|
|
if (r->pos > 0) {
|
|
|
|
if (r->pos == sdslen(r->buf)) {
|
|
|
|
/* sdsrange has a quirck on this edge case. */
|
|
|
|
sdsfree(r->buf);
|
|
|
|
r->buf = sdsempty();
|
|
|
|
} else {
|
|
|
|
r->buf = sdsrange(r->buf,r->pos,sdslen(r->buf));
|
2010-09-19 16:47:05 +00:00
|
|
|
}
|
2010-09-20 07:50:19 +00:00
|
|
|
r->pos = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Emit a reply when there is one. */
|
|
|
|
if (r->rpos == r->rlen) {
|
2010-09-20 16:02:28 +00:00
|
|
|
void *reply = r->reply;
|
|
|
|
r->reply = NULL;
|
2010-09-19 16:47:05 +00:00
|
|
|
|
2010-09-20 07:50:19 +00:00
|
|
|
/* Destroy the buffer when it is empty and is quite large. */
|
|
|
|
if (sdslen(r->buf) == 0 && sdsavail(r->buf) > 16*1024) {
|
|
|
|
sdsfree(r->buf);
|
|
|
|
r->buf = sdsempty();
|
|
|
|
r->pos = 0;
|
2010-09-19 17:01:31 +00:00
|
|
|
}
|
2010-09-19 16:47:05 +00:00
|
|
|
|
2010-09-20 16:02:28 +00:00
|
|
|
/* Set list of items to read to be empty. */
|
2010-09-20 07:50:19 +00:00
|
|
|
r->rlen = r->rpos = 0;
|
|
|
|
return reply;
|
|
|
|
} else {
|
|
|
|
return NULL;
|
2010-09-19 16:47:05 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-05-18 15:11:09 +00:00
|
|
|
/* Helper function for redisCommand(). It's used to append the next argument
|
|
|
|
* to the argument vector. */
|
|
|
|
static void addArgument(sds a, char ***argv, int *argc) {
|
|
|
|
(*argc)++;
|
|
|
|
if ((*argv = realloc(*argv, sizeof(char*)*(*argc))) == NULL) redisOOM();
|
|
|
|
(*argv)[(*argc)-1] = a;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Execute a command. This function is printf alike:
|
|
|
|
*
|
|
|
|
* %s represents a C nul terminated string you want to interpolate
|
|
|
|
* %b represents a binary safe string
|
|
|
|
*
|
|
|
|
* When using %b you need to provide both the pointer to the string
|
|
|
|
* and the length in bytes. Examples:
|
|
|
|
*
|
|
|
|
* redisCommand("GET %s", mykey);
|
|
|
|
* redisCommand("SET %s %b", mykey, somevalue, somevalue_len);
|
|
|
|
*
|
|
|
|
* RETURN VALUE:
|
|
|
|
*
|
|
|
|
* The returned value is a redisReply object that must be freed using the
|
|
|
|
* redisFreeReply() function.
|
|
|
|
*
|
|
|
|
* given a redisReply "reply" you can test if there was an error in this way:
|
|
|
|
*
|
|
|
|
* if (reply->type == REDIS_REPLY_ERROR) {
|
|
|
|
* printf("Error in request: %s\n", reply->reply);
|
|
|
|
* }
|
|
|
|
*
|
|
|
|
* The replied string itself is in reply->reply if the reply type is
|
|
|
|
* a REDIS_REPLY_STRING. If the reply is a multi bulk reply then
|
|
|
|
* reply->type is REDIS_REPLY_ARRAY and you can access all the elements
|
|
|
|
* in this way:
|
|
|
|
*
|
|
|
|
* for (i = 0; i < reply->elements; i++)
|
|
|
|
* printf("%d: %s\n", i, reply->element[i]);
|
|
|
|
*
|
|
|
|
* Finally when type is REDIS_REPLY_INTEGER the long long integer is
|
|
|
|
* stored at reply->integer.
|
|
|
|
*/
|
2010-05-25 11:56:18 +00:00
|
|
|
redisReply *redisCommand(int fd, const char *format, ...) {
|
2010-05-18 15:11:09 +00:00
|
|
|
va_list ap;
|
|
|
|
size_t size;
|
2010-05-25 11:56:18 +00:00
|
|
|
const char *arg, *c = format;
|
2010-05-18 15:11:09 +00:00
|
|
|
sds cmd = sdsempty(); /* whole command buffer */
|
|
|
|
sds current = sdsempty(); /* current argument */
|
|
|
|
char **argv = NULL;
|
|
|
|
int argc = 0, j;
|
|
|
|
|
|
|
|
/* Build the command string accordingly to protocol */
|
|
|
|
va_start(ap,format);
|
|
|
|
while(*c != '\0') {
|
|
|
|
if (*c != '%' || c[1] == '\0') {
|
|
|
|
if (*c == ' ') {
|
|
|
|
if (sdslen(current) != 0) {
|
|
|
|
addArgument(current, &argv, &argc);
|
|
|
|
current = sdsempty();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
current = sdscatlen(current,c,1);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
switch(c[1]) {
|
|
|
|
case 's':
|
|
|
|
arg = va_arg(ap,char*);
|
|
|
|
current = sdscat(current,arg);
|
|
|
|
break;
|
|
|
|
case 'b':
|
|
|
|
arg = va_arg(ap,char*);
|
|
|
|
size = va_arg(ap,size_t);
|
|
|
|
current = sdscatlen(current,arg,size);
|
|
|
|
break;
|
|
|
|
case '%':
|
|
|
|
cmd = sdscat(cmd,"%");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
c++;
|
|
|
|
}
|
|
|
|
c++;
|
|
|
|
}
|
|
|
|
va_end(ap);
|
|
|
|
|
|
|
|
/* Add the last argument if needed */
|
|
|
|
if (sdslen(current) != 0)
|
|
|
|
addArgument(current, &argv, &argc);
|
|
|
|
else
|
|
|
|
sdsfree(current);
|
|
|
|
|
|
|
|
/* Build the command at protocol level */
|
|
|
|
cmd = sdscatprintf(cmd,"*%d\r\n",argc);
|
|
|
|
for (j = 0; j < argc; j++) {
|
|
|
|
cmd = sdscatprintf(cmd,"$%zu\r\n",sdslen(argv[j]));
|
|
|
|
cmd = sdscatlen(cmd,argv[j],sdslen(argv[j]));
|
|
|
|
cmd = sdscatlen(cmd,"\r\n",2);
|
|
|
|
sdsfree(argv[j]);
|
|
|
|
}
|
|
|
|
free(argv);
|
|
|
|
|
|
|
|
/* Send the command via socket */
|
|
|
|
anetWrite(fd,cmd,sdslen(cmd));
|
|
|
|
sdsfree(cmd);
|
|
|
|
return redisReadReply(fd);
|
|
|
|
}
|