1213 lines
34 KiB
C
1213 lines
34 KiB
C
/*
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* Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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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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#include "fmacros.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 <assert.h>
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#include <errno.h>
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#include <ctype.h>
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#include "hiredis.h"
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#include "net.h"
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#include "sds.h"
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#include "util.h"
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static redisReply *createReplyObject(int type);
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static void *createStringObject(const redisReadTask *task, char *str, size_t len);
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static void *createArrayObject(const redisReadTask *task, int elements);
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static void *createIntegerObject(const redisReadTask *task, long long value);
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static void *createNilObject(const redisReadTask *task);
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/* Default set of functions to build the reply. Keep in mind that such a
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* function returning NULL is interpreted as OOM. */
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static redisReplyObjectFunctions 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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/* Create a reply object */
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static redisReply *createReplyObject(int type) {
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redisReply *r = calloc(1,sizeof(*r));
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if (r == NULL)
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return NULL;
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r->type = type;
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return r;
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}
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/* Free a reply object */
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void freeReplyObject(void *reply) {
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redisReply *r = reply;
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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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if (r->elements > 0 && r->element != NULL) {
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for (j = 0; j < r->elements; j++)
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if (r->element[j] != NULL)
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freeReplyObject(r->element[j]);
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free(r->element);
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}
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break;
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case REDIS_REPLY_ERROR:
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case REDIS_REPLY_STATUS:
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case REDIS_REPLY_STRING:
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if (r->str != NULL)
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free(r->str);
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break;
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}
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free(r);
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}
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static void *createStringObject(const redisReadTask *task, char *str, size_t len) {
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redisReply *r, *parent;
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char *buf;
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r = createReplyObject(task->type);
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if (r == NULL)
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return NULL;
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buf = malloc(len+1);
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if (buf == NULL) {
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freeReplyObject(r);
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return NULL;
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}
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assert(task->type == REDIS_REPLY_ERROR ||
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task->type == REDIS_REPLY_STATUS ||
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task->type == REDIS_REPLY_STRING);
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/* Copy string value */
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memcpy(buf,str,len);
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buf[len] = '\0';
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r->str = buf;
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r->len = len;
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if (task->parent) {
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parent = task->parent->obj;
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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(const redisReadTask *task, int elements) {
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redisReply *r, *parent;
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r = createReplyObject(REDIS_REPLY_ARRAY);
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if (r == NULL)
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return NULL;
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r->element = calloc(elements,sizeof(redisReply*));
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if (r->element == NULL) {
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freeReplyObject(r);
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return NULL;
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}
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r->elements = elements;
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if (task->parent) {
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parent = task->parent->obj;
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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(const redisReadTask *task, long long value) {
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redisReply *r, *parent;
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r = createReplyObject(REDIS_REPLY_INTEGER);
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if (r == NULL)
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return NULL;
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r->integer = value;
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if (task->parent) {
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parent = task->parent->obj;
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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(const redisReadTask *task) {
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redisReply *r, *parent;
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r = createReplyObject(REDIS_REPLY_NIL);
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if (r == NULL)
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return NULL;
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if (task->parent) {
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parent = task->parent->obj;
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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 __redisReaderSetError(redisReader *r, int type, const char *str) {
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size_t len;
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if (r->reply != NULL && r->fn && r->fn->freeObject) {
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r->fn->freeObject(r->reply);
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r->reply = NULL;
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}
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/* Clear input buffer on errors. */
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if (r->buf != NULL) {
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sdsfree(r->buf);
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r->buf = NULL;
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r->pos = r->len = 0;
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}
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/* Reset task stack. */
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r->ridx = -1;
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/* Set error. */
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r->err = type;
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len = strlen(str);
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len = len < (sizeof(r->errstr)-1) ? len : (sizeof(r->errstr)-1);
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memcpy(r->errstr,str,len);
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r->errstr[len] = '\0';
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}
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static void __redisReaderSetErrorProtocolByte(redisReader *r, char byte) {
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char cbuf[8], sbuf[128];
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chrtos(cbuf,sizeof(cbuf),byte);
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snprintf(sbuf,sizeof(sbuf),
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"Protocol error, got %s as reply type byte", cbuf);
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,sbuf);
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}
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static void __redisReaderSetErrorOOM(redisReader *r) {
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__redisReaderSetError(r,REDIS_ERR_OOM,"Out of memory");
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}
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static char *readBytes(redisReader *r, unsigned int bytes) {
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char *p;
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if (r->len-r->pos >= bytes) {
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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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/* Find pointer to \r\n. */
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static char *seekNewline(char *s, size_t len) {
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int pos = 0;
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int _len = len-1;
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/* Position should be < len-1 because the character at "pos" should be
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* followed by a \n. Note that strchr cannot be used because it doesn't
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* allow to search a limited length and the buffer that is being searched
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* might not have a trailing NULL character. */
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while (pos < _len) {
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while(pos < _len && s[pos] != '\r') pos++;
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if (s[pos] != '\r') {
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/* Not found. */
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return NULL;
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} else {
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if (s[pos+1] == '\n') {
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/* Found. */
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return s+pos;
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} else {
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/* Continue searching. */
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pos++;
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}
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}
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}
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return NULL;
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}
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/* Read a long long value starting at *s, under the assumption that it will be
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* terminated by \r\n. Ambiguously returns -1 for unexpected input. */
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static long long readLongLong(char *s) {
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long long v = 0;
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int dec, mult = 1;
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char c;
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if (*s == '-') {
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mult = -1;
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s++;
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} else if (*s == '+') {
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mult = 1;
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s++;
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}
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while ((c = *(s++)) != '\r') {
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dec = c - '0';
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if (dec >= 0 && dec < 10) {
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v *= 10;
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v += dec;
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} else {
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/* Should not happen... */
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return -1;
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}
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}
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return mult*v;
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}
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static char *readLine(redisReader *r, int *_len) {
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char *p, *s;
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int len;
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p = r->buf+r->pos;
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s = seekNewline(p,(r->len-r->pos));
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if (s != NULL) {
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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 void moveToNextTask(redisReader *r) {
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redisReadTask *cur, *prv;
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while (r->ridx >= 0) {
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/* Return a.s.a.p. when the stack is now empty. */
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if (r->ridx == 0) {
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r->ridx--;
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return;
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}
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cur = &(r->rstack[r->ridx]);
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prv = &(r->rstack[r->ridx-1]);
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assert(prv->type == REDIS_REPLY_ARRAY);
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if (cur->idx == prv->elements-1) {
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r->ridx--;
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} else {
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/* Reset the type because the next item can be anything */
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assert(cur->idx < prv->elements);
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cur->type = -1;
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cur->elements = -1;
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cur->idx++;
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return;
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}
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}
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}
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static int processLineItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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void *obj;
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char *p;
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int len;
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if ((p = readLine(r,&len)) != NULL) {
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if (cur->type == REDIS_REPLY_INTEGER) {
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if (r->fn && r->fn->createInteger)
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obj = r->fn->createInteger(cur,readLongLong(p));
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else
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obj = (void*)REDIS_REPLY_INTEGER;
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} else {
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/* Type will be error or status. */
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if (r->fn && r->fn->createString)
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obj = r->fn->createString(cur,p,len);
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else
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obj = (void*)(size_t)(cur->type);
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}
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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/* Set reply if this is the root object. */
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if (r->ridx == 0) r->reply = obj;
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moveToNextTask(r);
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return REDIS_OK;
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}
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return REDIS_ERR;
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}
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static int processBulkItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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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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int success = 0;
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p = r->buf+r->pos;
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s = seekNewline(p,r->len-r->pos);
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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 = readLongLong(p);
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if (len < 0) {
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/* The nil object can always be created. */
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if (r->fn && r->fn->createNil)
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obj = r->fn->createNil(cur);
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else
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obj = (void*)REDIS_REPLY_NIL;
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success = 1;
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} else {
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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 <= r->len) {
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if (r->fn && r->fn->createString)
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obj = r->fn->createString(cur,s+2,len);
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else
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obj = (void*)REDIS_REPLY_STRING;
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success = 1;
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}
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}
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/* Proceed when obj was created. */
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if (success) {
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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r->pos += bytelen;
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/* Set reply if this is the root object. */
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if (r->ridx == 0) r->reply = obj;
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moveToNextTask(r);
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return REDIS_OK;
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}
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}
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return REDIS_ERR;
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}
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static int processMultiBulkItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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void *obj;
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char *p;
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long elements;
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int root = 0;
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/* Set error for nested multi bulks with depth > 1 */
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if (r->ridx == 2) {
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__redisReaderSetError(r,REDIS_ERR_PROTOCOL,
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"No support for nested multi bulk replies with depth > 1");
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return REDIS_ERR;
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}
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if ((p = readLine(r,NULL)) != NULL) {
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elements = readLongLong(p);
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root = (r->ridx == 0);
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if (elements == -1) {
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if (r->fn && r->fn->createNil)
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obj = r->fn->createNil(cur);
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else
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obj = (void*)REDIS_REPLY_NIL;
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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moveToNextTask(r);
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} else {
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if (r->fn && r->fn->createArray)
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obj = r->fn->createArray(cur,elements);
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else
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obj = (void*)REDIS_REPLY_ARRAY;
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if (obj == NULL) {
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__redisReaderSetErrorOOM(r);
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return REDIS_ERR;
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}
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/* Modify task stack when there are more than 0 elements. */
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if (elements > 0) {
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cur->elements = elements;
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cur->obj = obj;
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r->ridx++;
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r->rstack[r->ridx].type = -1;
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r->rstack[r->ridx].elements = -1;
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r->rstack[r->ridx].idx = 0;
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r->rstack[r->ridx].obj = NULL;
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r->rstack[r->ridx].parent = cur;
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r->rstack[r->ridx].privdata = r->privdata;
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} else {
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moveToNextTask(r);
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}
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}
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/* Set reply if this is the root object. */
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if (root) r->reply = obj;
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return REDIS_OK;
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}
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return REDIS_ERR;
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}
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static int processItem(redisReader *r) {
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redisReadTask *cur = &(r->rstack[r->ridx]);
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char *p;
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/* check if we need to read type */
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if (cur->type < 0) {
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if ((p = readBytes(r,1)) != NULL) {
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switch (p[0]) {
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case '-':
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cur->type = REDIS_REPLY_ERROR;
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break;
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case '+':
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cur->type = REDIS_REPLY_STATUS;
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break;
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case ':':
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cur->type = REDIS_REPLY_INTEGER;
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break;
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case '$':
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cur->type = REDIS_REPLY_STRING;
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break;
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case '*':
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cur->type = REDIS_REPLY_ARRAY;
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break;
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default:
|
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__redisReaderSetErrorProtocolByte(r,*p);
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return REDIS_ERR;
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}
|
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} else {
|
|
/* could not consume 1 byte */
|
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return REDIS_ERR;
|
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}
|
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}
|
|
|
|
/* process typed item */
|
|
switch(cur->type) {
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case REDIS_REPLY_ERROR:
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case REDIS_REPLY_STATUS:
|
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case REDIS_REPLY_INTEGER:
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return processLineItem(r);
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case REDIS_REPLY_STRING:
|
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return processBulkItem(r);
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case REDIS_REPLY_ARRAY:
|
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return processMultiBulkItem(r);
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|
default:
|
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assert(NULL);
|
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return REDIS_ERR; /* Avoid warning. */
|
|
}
|
|
}
|
|
|
|
redisReader *redisReaderCreate(void) {
|
|
redisReader *r;
|
|
|
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r = calloc(sizeof(redisReader),1);
|
|
if (r == NULL)
|
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return NULL;
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|
|
r->err = 0;
|
|
r->errstr[0] = '\0';
|
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r->fn = &defaultFunctions;
|
|
r->buf = sdsempty();
|
|
if (r->buf == NULL) {
|
|
free(r);
|
|
return NULL;
|
|
}
|
|
|
|
r->ridx = -1;
|
|
return r;
|
|
}
|
|
|
|
void redisReaderFree(redisReader *r) {
|
|
if (r->reply != NULL && r->fn && r->fn->freeObject)
|
|
r->fn->freeObject(r->reply);
|
|
if (r->buf != NULL)
|
|
sdsfree(r->buf);
|
|
free(r);
|
|
}
|
|
|
|
int redisReaderFeed(redisReader *r, const char *buf, size_t len) {
|
|
sds newbuf;
|
|
|
|
/* Return early when this reader is in an erroneous state. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* Copy the provided buffer. */
|
|
if (buf != NULL && len >= 1) {
|
|
/* Destroy internal buffer when it is empty and is quite large. */
|
|
if (r->len == 0 && sdsavail(r->buf) > 16*1024) {
|
|
sdsfree(r->buf);
|
|
r->buf = sdsempty();
|
|
r->pos = 0;
|
|
|
|
/* r->buf should not be NULL since we just free'd a larger one. */
|
|
assert(r->buf != NULL);
|
|
}
|
|
|
|
newbuf = sdscatlen(r->buf,buf,len);
|
|
if (newbuf == NULL) {
|
|
__redisReaderSetErrorOOM(r);
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
r->buf = newbuf;
|
|
r->len = sdslen(r->buf);
|
|
}
|
|
|
|
return REDIS_OK;
|
|
}
|
|
|
|
int redisReaderGetReply(redisReader *r, void **reply) {
|
|
/* Default target pointer to NULL. */
|
|
if (reply != NULL)
|
|
*reply = NULL;
|
|
|
|
/* Return early when this reader is in an erroneous state. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* When the buffer is empty, there will never be a reply. */
|
|
if (r->len == 0)
|
|
return REDIS_OK;
|
|
|
|
/* Set first item to process when the stack is empty. */
|
|
if (r->ridx == -1) {
|
|
r->rstack[0].type = -1;
|
|
r->rstack[0].elements = -1;
|
|
r->rstack[0].idx = -1;
|
|
r->rstack[0].obj = NULL;
|
|
r->rstack[0].parent = NULL;
|
|
r->rstack[0].privdata = r->privdata;
|
|
r->ridx = 0;
|
|
}
|
|
|
|
/* Process items in reply. */
|
|
while (r->ridx >= 0)
|
|
if (processItem(r) != REDIS_OK)
|
|
break;
|
|
|
|
/* Return ASAP when an error occurred. */
|
|
if (r->err)
|
|
return REDIS_ERR;
|
|
|
|
/* Discard part of the buffer when we've consumed at least 1k, to avoid
|
|
* doing unnecessary calls to memmove() in sds.c. */
|
|
if (r->pos >= 1024) {
|
|
r->buf = sdsrange(r->buf,r->pos,-1);
|
|
r->pos = 0;
|
|
r->len = sdslen(r->buf);
|
|
}
|
|
|
|
/* Emit a reply when there is one. */
|
|
if (r->ridx == -1) {
|
|
if (reply != NULL)
|
|
*reply = r->reply;
|
|
r->reply = NULL;
|
|
}
|
|
return REDIS_OK;
|
|
}
|
|
|
|
/* Calculate the number of bytes needed to represent an integer as string. */
|
|
static int intlen(int i) {
|
|
int len = 0;
|
|
if (i < 0) {
|
|
len++;
|
|
i = -i;
|
|
}
|
|
do {
|
|
len++;
|
|
i /= 10;
|
|
} while(i);
|
|
return len;
|
|
}
|
|
|
|
/* Helper that calculates the bulk length given a certain string length. */
|
|
static size_t bulklen(size_t len) {
|
|
return 1+intlen(len)+2+len+2;
|
|
}
|
|
|
|
int redisvFormatCommand(char **target, const char *format, va_list ap) {
|
|
const char *c = format;
|
|
char *cmd = NULL; /* final command */
|
|
int pos; /* position in final command */
|
|
sds curarg, newarg; /* current argument */
|
|
int touched = 0; /* was the current argument touched? */
|
|
char **curargv = NULL, **newargv = NULL;
|
|
int argc = 0;
|
|
int totlen = 0;
|
|
int j;
|
|
|
|
/* Abort if there is not target to set */
|
|
if (target == NULL)
|
|
return -1;
|
|
|
|
/* Build the command string accordingly to protocol */
|
|
curarg = sdsempty();
|
|
if (curarg == NULL)
|
|
return -1;
|
|
|
|
while(*c != '\0') {
|
|
if (*c != '%' || c[1] == '\0') {
|
|
if (*c == ' ') {
|
|
if (touched) {
|
|
newargv = realloc(curargv,sizeof(char*)*(argc+1));
|
|
if (newargv == NULL) goto err;
|
|
curargv = newargv;
|
|
curargv[argc++] = curarg;
|
|
totlen += bulklen(sdslen(curarg));
|
|
|
|
/* curarg is put in argv so it can be overwritten. */
|
|
curarg = sdsempty();
|
|
if (curarg == NULL) goto err;
|
|
touched = 0;
|
|
}
|
|
} else {
|
|
newarg = sdscatlen(curarg,c,1);
|
|
if (newarg == NULL) goto err;
|
|
curarg = newarg;
|
|
touched = 1;
|
|
}
|
|
} else {
|
|
char *arg;
|
|
size_t size;
|
|
|
|
/* Set newarg so it can be checked even if it is not touched. */
|
|
newarg = curarg;
|
|
|
|
switch(c[1]) {
|
|
case 's':
|
|
arg = va_arg(ap,char*);
|
|
size = strlen(arg);
|
|
if (size > 0)
|
|
newarg = sdscatlen(curarg,arg,size);
|
|
break;
|
|
case 'b':
|
|
arg = va_arg(ap,char*);
|
|
size = va_arg(ap,size_t);
|
|
if (size > 0)
|
|
newarg = sdscatlen(curarg,arg,size);
|
|
break;
|
|
case '%':
|
|
newarg = sdscat(curarg,"%");
|
|
break;
|
|
default:
|
|
/* Try to detect printf format */
|
|
{
|
|
char _format[16];
|
|
const char *_p = c+1;
|
|
size_t _l = 0;
|
|
va_list _cpy;
|
|
|
|
/* Flags */
|
|
if (*_p != '\0' && *_p == '#') _p++;
|
|
if (*_p != '\0' && *_p == '0') _p++;
|
|
if (*_p != '\0' && *_p == '-') _p++;
|
|
if (*_p != '\0' && *_p == ' ') _p++;
|
|
if (*_p != '\0' && *_p == '+') _p++;
|
|
|
|
/* Field width */
|
|
while (*_p != '\0' && isdigit(*_p)) _p++;
|
|
|
|
/* Precision */
|
|
if (*_p == '.') {
|
|
_p++;
|
|
while (*_p != '\0' && isdigit(*_p)) _p++;
|
|
}
|
|
|
|
/* Modifiers */
|
|
if (*_p != '\0') {
|
|
if (*_p == 'h' || *_p == 'l') {
|
|
/* Allow a single repetition for these modifiers */
|
|
if (_p[0] == _p[1]) _p++;
|
|
_p++;
|
|
}
|
|
}
|
|
|
|
/* Conversion specifier */
|
|
if (*_p != '\0' && strchr("diouxXeEfFgGaA",*_p) != NULL) {
|
|
_l = (_p+1)-c;
|
|
if (_l < sizeof(_format)-2) {
|
|
memcpy(_format,c,_l);
|
|
_format[_l] = '\0';
|
|
va_copy(_cpy,ap);
|
|
newarg = sdscatvprintf(curarg,_format,_cpy);
|
|
va_end(_cpy);
|
|
|
|
/* Update current position (note: outer blocks
|
|
* increment c twice so compensate here) */
|
|
c = _p-1;
|
|
}
|
|
}
|
|
|
|
/* Consume and discard vararg */
|
|
va_arg(ap,void);
|
|
}
|
|
}
|
|
|
|
if (newarg == NULL) goto err;
|
|
curarg = newarg;
|
|
|
|
touched = 1;
|
|
c++;
|
|
}
|
|
c++;
|
|
}
|
|
|
|
/* Add the last argument if needed */
|
|
if (touched) {
|
|
newargv = realloc(curargv,sizeof(char*)*(argc+1));
|
|
if (newargv == NULL) goto err;
|
|
curargv = newargv;
|
|
curargv[argc++] = curarg;
|
|
totlen += bulklen(sdslen(curarg));
|
|
} else {
|
|
sdsfree(curarg);
|
|
}
|
|
|
|
/* Clear curarg because it was put in curargv or was free'd. */
|
|
curarg = NULL;
|
|
|
|
/* Add bytes needed to hold multi bulk count */
|
|
totlen += 1+intlen(argc)+2;
|
|
|
|
/* Build the command at protocol level */
|
|
cmd = malloc(totlen+1);
|
|
if (cmd == NULL) goto err;
|
|
|
|
pos = sprintf(cmd,"*%d\r\n",argc);
|
|
for (j = 0; j < argc; j++) {
|
|
pos += sprintf(cmd+pos,"$%zu\r\n",sdslen(curargv[j]));
|
|
memcpy(cmd+pos,curargv[j],sdslen(curargv[j]));
|
|
pos += sdslen(curargv[j]);
|
|
sdsfree(curargv[j]);
|
|
cmd[pos++] = '\r';
|
|
cmd[pos++] = '\n';
|
|
}
|
|
assert(pos == totlen);
|
|
cmd[pos] = '\0';
|
|
|
|
free(curargv);
|
|
*target = cmd;
|
|
return totlen;
|
|
|
|
err:
|
|
while(argc--)
|
|
sdsfree(curargv[argc]);
|
|
free(curargv);
|
|
|
|
if (curarg != NULL)
|
|
sdsfree(curarg);
|
|
|
|
/* No need to check cmd since it is the last statement that can fail,
|
|
* but do it anyway to be as defensive as possible. */
|
|
if (cmd != NULL)
|
|
free(cmd);
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Format a command according to the Redis protocol. This function
|
|
* takes a format similar to printf:
|
|
*
|
|
* %s represents a C null 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:
|
|
*
|
|
* len = redisFormatCommand(target, "GET %s", mykey);
|
|
* len = redisFormatCommand(target, "SET %s %b", mykey, myval, myvallen);
|
|
*/
|
|
int redisFormatCommand(char **target, const char *format, ...) {
|
|
va_list ap;
|
|
int len;
|
|
va_start(ap,format);
|
|
len = redisvFormatCommand(target,format,ap);
|
|
va_end(ap);
|
|
return len;
|
|
}
|
|
|
|
/* Format a command according to the Redis protocol. This function takes the
|
|
* number of arguments, an array with arguments and an array with their
|
|
* lengths. If the latter is set to NULL, strlen will be used to compute the
|
|
* argument lengths.
|
|
*/
|
|
int redisFormatCommandArgv(char **target, int argc, const char **argv, const size_t *argvlen) {
|
|
char *cmd = NULL; /* final command */
|
|
int pos; /* position in final command */
|
|
size_t len;
|
|
int totlen, j;
|
|
|
|
/* Calculate number of bytes needed for the command */
|
|
totlen = 1+intlen(argc)+2;
|
|
for (j = 0; j < argc; j++) {
|
|
len = argvlen ? argvlen[j] : strlen(argv[j]);
|
|
totlen += bulklen(len);
|
|
}
|
|
|
|
/* Build the command at protocol level */
|
|
cmd = malloc(totlen+1);
|
|
if (cmd == NULL)
|
|
return -1;
|
|
|
|
pos = sprintf(cmd,"*%d\r\n",argc);
|
|
for (j = 0; j < argc; j++) {
|
|
len = argvlen ? argvlen[j] : strlen(argv[j]);
|
|
pos += sprintf(cmd+pos,"$%zu\r\n",len);
|
|
memcpy(cmd+pos,argv[j],len);
|
|
pos += len;
|
|
cmd[pos++] = '\r';
|
|
cmd[pos++] = '\n';
|
|
}
|
|
assert(pos == totlen);
|
|
cmd[pos] = '\0';
|
|
|
|
*target = cmd;
|
|
return totlen;
|
|
}
|
|
|
|
void __redisSetError(redisContext *c, int type, const char *str) {
|
|
size_t len;
|
|
|
|
c->err = type;
|
|
if (str != NULL) {
|
|
len = strlen(str);
|
|
len = len < (sizeof(c->errstr)-1) ? len : (sizeof(c->errstr)-1);
|
|
memcpy(c->errstr,str,len);
|
|
c->errstr[len] = '\0';
|
|
} else {
|
|
/* Only REDIS_ERR_IO may lack a description! */
|
|
assert(type == REDIS_ERR_IO);
|
|
strerror_r(errno,c->errstr,sizeof(c->errstr));
|
|
}
|
|
}
|
|
|
|
static redisContext *redisContextInit(void) {
|
|
redisContext *c;
|
|
|
|
c = calloc(1,sizeof(redisContext));
|
|
if (c == NULL)
|
|
return NULL;
|
|
|
|
c->err = 0;
|
|
c->errstr[0] = '\0';
|
|
c->obuf = sdsempty();
|
|
c->reader = redisReaderCreate();
|
|
return c;
|
|
}
|
|
|
|
void redisFree(redisContext *c) {
|
|
if (c->fd > 0)
|
|
close(c->fd);
|
|
if (c->obuf != NULL)
|
|
sdsfree(c->obuf);
|
|
if (c->reader != NULL)
|
|
redisReaderFree(c->reader);
|
|
free(c);
|
|
}
|
|
|
|
/* Connect to a Redis instance. On error the field error in the returned
|
|
* context will be set to the return value of the error function.
|
|
* When no set of reply functions is given, the default set will be used. */
|
|
redisContext *redisConnect(const char *ip, int port) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags |= REDIS_BLOCK;
|
|
redisContextConnectTcp(c,ip,port,NULL);
|
|
return c;
|
|
}
|
|
|
|
redisContext *redisConnectWithTimeout(const char *ip, int port, struct timeval tv) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags |= REDIS_BLOCK;
|
|
redisContextConnectTcp(c,ip,port,&tv);
|
|
return c;
|
|
}
|
|
|
|
redisContext *redisConnectNonBlock(const char *ip, int port) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags &= ~REDIS_BLOCK;
|
|
redisContextConnectTcp(c,ip,port,NULL);
|
|
return c;
|
|
}
|
|
|
|
redisContext *redisConnectUnix(const char *path) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags |= REDIS_BLOCK;
|
|
redisContextConnectUnix(c,path,NULL);
|
|
return c;
|
|
}
|
|
|
|
redisContext *redisConnectUnixWithTimeout(const char *path, struct timeval tv) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags |= REDIS_BLOCK;
|
|
redisContextConnectUnix(c,path,&tv);
|
|
return c;
|
|
}
|
|
|
|
redisContext *redisConnectUnixNonBlock(const char *path) {
|
|
redisContext *c = redisContextInit();
|
|
c->flags &= ~REDIS_BLOCK;
|
|
redisContextConnectUnix(c,path,NULL);
|
|
return c;
|
|
}
|
|
|
|
/* Set read/write timeout on a blocking socket. */
|
|
int redisSetTimeout(redisContext *c, struct timeval tv) {
|
|
if (c->flags & REDIS_BLOCK)
|
|
return redisContextSetTimeout(c,tv);
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
/* Use this function to handle a read event on the descriptor. It will try
|
|
* and read some bytes from the socket and feed them to the reply parser.
|
|
*
|
|
* After this function is called, you may use redisContextReadReply to
|
|
* see if there is a reply available. */
|
|
int redisBufferRead(redisContext *c) {
|
|
char buf[2048];
|
|
int nread;
|
|
|
|
/* Return early when the context has seen an error. */
|
|
if (c->err)
|
|
return REDIS_ERR;
|
|
|
|
nread = read(c->fd,buf,sizeof(buf));
|
|
if (nread == -1) {
|
|
if (errno == EAGAIN && !(c->flags & REDIS_BLOCK)) {
|
|
/* Try again later */
|
|
} else {
|
|
__redisSetError(c,REDIS_ERR_IO,NULL);
|
|
return REDIS_ERR;
|
|
}
|
|
} else if (nread == 0) {
|
|
__redisSetError(c,REDIS_ERR_EOF,"Server closed the connection");
|
|
return REDIS_ERR;
|
|
} else {
|
|
if (redisReaderFeed(c->reader,buf,nread) != REDIS_OK) {
|
|
__redisSetError(c,c->reader->err,c->reader->errstr);
|
|
return REDIS_ERR;
|
|
}
|
|
}
|
|
return REDIS_OK;
|
|
}
|
|
|
|
/* Write the output buffer to the socket.
|
|
*
|
|
* Returns REDIS_OK when the buffer is empty, or (a part of) the buffer was
|
|
* succesfully written to the socket. When the buffer is empty after the
|
|
* write operation, "wdone" is set to 1 (if given).
|
|
*
|
|
* Returns REDIS_ERR if an error occured trying to write and sets
|
|
* c->error to hold the appropriate error string.
|
|
*/
|
|
int redisBufferWrite(redisContext *c, int *done) {
|
|
int nwritten;
|
|
|
|
/* Return early when the context has seen an error. */
|
|
if (c->err)
|
|
return REDIS_ERR;
|
|
|
|
if (sdslen(c->obuf) > 0) {
|
|
nwritten = write(c->fd,c->obuf,sdslen(c->obuf));
|
|
if (nwritten == -1) {
|
|
if (errno == EAGAIN && !(c->flags & REDIS_BLOCK)) {
|
|
/* Try again later */
|
|
} else {
|
|
__redisSetError(c,REDIS_ERR_IO,NULL);
|
|
return REDIS_ERR;
|
|
}
|
|
} else if (nwritten > 0) {
|
|
if (nwritten == (signed)sdslen(c->obuf)) {
|
|
sdsfree(c->obuf);
|
|
c->obuf = sdsempty();
|
|
} else {
|
|
c->obuf = sdsrange(c->obuf,nwritten,-1);
|
|
}
|
|
}
|
|
}
|
|
if (done != NULL) *done = (sdslen(c->obuf) == 0);
|
|
return REDIS_OK;
|
|
}
|
|
|
|
/* Internal helper function to try and get a reply from the reader,
|
|
* or set an error in the context otherwise. */
|
|
int redisGetReplyFromReader(redisContext *c, void **reply) {
|
|
if (redisReaderGetReply(c->reader,reply) == REDIS_ERR) {
|
|
__redisSetError(c,c->reader->err,c->reader->errstr);
|
|
return REDIS_ERR;
|
|
}
|
|
return REDIS_OK;
|
|
}
|
|
|
|
int redisGetReply(redisContext *c, void **reply) {
|
|
int wdone = 0;
|
|
void *aux = NULL;
|
|
|
|
/* Try to read pending replies */
|
|
if (redisGetReplyFromReader(c,&aux) == REDIS_ERR)
|
|
return REDIS_ERR;
|
|
|
|
/* For the blocking context, flush output buffer and read reply */
|
|
if (aux == NULL && c->flags & REDIS_BLOCK) {
|
|
/* Write until done */
|
|
do {
|
|
if (redisBufferWrite(c,&wdone) == REDIS_ERR)
|
|
return REDIS_ERR;
|
|
} while (!wdone);
|
|
|
|
/* Read until there is a reply */
|
|
do {
|
|
if (redisBufferRead(c) == REDIS_ERR)
|
|
return REDIS_ERR;
|
|
if (redisGetReplyFromReader(c,&aux) == REDIS_ERR)
|
|
return REDIS_ERR;
|
|
} while (aux == NULL);
|
|
}
|
|
|
|
/* Set reply object */
|
|
if (reply != NULL) *reply = aux;
|
|
return REDIS_OK;
|
|
}
|
|
|
|
|
|
/* Helper function for the redisAppendCommand* family of functions.
|
|
*
|
|
* Write a formatted command to the output buffer. When this family
|
|
* is used, you need to call redisGetReply yourself to retrieve
|
|
* the reply (or replies in pub/sub).
|
|
*/
|
|
int __redisAppendCommand(redisContext *c, char *cmd, size_t len) {
|
|
sds newbuf;
|
|
|
|
newbuf = sdscatlen(c->obuf,cmd,len);
|
|
if (newbuf == NULL) {
|
|
__redisSetError(c,REDIS_ERR_OOM,"Out of memory");
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
c->obuf = newbuf;
|
|
return REDIS_OK;
|
|
}
|
|
|
|
int redisvAppendCommand(redisContext *c, const char *format, va_list ap) {
|
|
char *cmd;
|
|
int len;
|
|
|
|
len = redisvFormatCommand(&cmd,format,ap);
|
|
if (len == -1) {
|
|
__redisSetError(c,REDIS_ERR_OOM,"Out of memory");
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
if (__redisAppendCommand(c,cmd,len) != REDIS_OK) {
|
|
free(cmd);
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
free(cmd);
|
|
return REDIS_OK;
|
|
}
|
|
|
|
int redisAppendCommand(redisContext *c, const char *format, ...) {
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap,format);
|
|
ret = redisvAppendCommand(c,format,ap);
|
|
va_end(ap);
|
|
return ret;
|
|
}
|
|
|
|
int redisAppendCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen) {
|
|
char *cmd;
|
|
int len;
|
|
|
|
len = redisFormatCommandArgv(&cmd,argc,argv,argvlen);
|
|
if (len == -1) {
|
|
__redisSetError(c,REDIS_ERR_OOM,"Out of memory");
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
if (__redisAppendCommand(c,cmd,len) != REDIS_OK) {
|
|
free(cmd);
|
|
return REDIS_ERR;
|
|
}
|
|
|
|
free(cmd);
|
|
return REDIS_OK;
|
|
}
|
|
|
|
/* Helper function for the redisCommand* family of functions.
|
|
*
|
|
* Write a formatted command to the output buffer. If the given context is
|
|
* blocking, immediately read the reply into the "reply" pointer. When the
|
|
* context is non-blocking, the "reply" pointer will not be used and the
|
|
* command is simply appended to the write buffer.
|
|
*
|
|
* Returns the reply when a reply was succesfully retrieved. Returns NULL
|
|
* otherwise. When NULL is returned in a blocking context, the error field
|
|
* in the context will be set.
|
|
*/
|
|
static void *__redisBlockForReply(redisContext *c) {
|
|
void *reply;
|
|
|
|
if (c->flags & REDIS_BLOCK) {
|
|
if (redisGetReply(c,&reply) != REDIS_OK)
|
|
return NULL;
|
|
return reply;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void *redisvCommand(redisContext *c, const char *format, va_list ap) {
|
|
if (redisvAppendCommand(c,format,ap) != REDIS_OK)
|
|
return NULL;
|
|
return __redisBlockForReply(c);
|
|
}
|
|
|
|
void *redisCommand(redisContext *c, const char *format, ...) {
|
|
va_list ap;
|
|
void *reply = NULL;
|
|
va_start(ap,format);
|
|
reply = redisvCommand(c,format,ap);
|
|
va_end(ap);
|
|
return reply;
|
|
}
|
|
|
|
void *redisCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen) {
|
|
if (redisAppendCommandArgv(c,argc,argv,argvlen) != REDIS_OK)
|
|
return NULL;
|
|
return __redisBlockForReply(c);
|
|
}
|