Permalink
1021 lines (861 sloc) 28.7 KB
/*
* Copyright (c) 2009-2011, Salvatore Sanfilippo <antirez at gmail dot com>
* Copyright (c) 2010-2014, Pieter Noordhuis <pcnoordhuis at gmail dot com>
* Copyright (c) 2015, Matt Stancliff <matt at genges dot com>,
* Jan-Erik Rediger <janerik at fnordig dot com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "fmacros.h"
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include "hiredis.h"
#include "net.h"
#include "sds.h"
static redisReply *createReplyObject(int type);
static void *createStringObject(const redisReadTask *task, char *str, size_t len);
static void *createArrayObject(const redisReadTask *task, int elements);
static void *createIntegerObject(const redisReadTask *task, long long value);
static void *createNilObject(const redisReadTask *task);
/* Default set of functions to build the reply. Keep in mind that such a
* function returning NULL is interpreted as OOM. */
static redisReplyObjectFunctions defaultFunctions = {
createStringObject,
createArrayObject,
createIntegerObject,
createNilObject,
freeReplyObject
};
/* Create a reply object */
static redisReply *createReplyObject(int type) {
redisReply *r = calloc(1,sizeof(*r));
if (r == NULL)
return NULL;
r->type = type;
return r;
}
/* Free a reply object */
void freeReplyObject(void *reply) {
redisReply *r = reply;
size_t j;
if (r == NULL)
return;
switch(r->type) {
case REDIS_REPLY_INTEGER:
break; /* Nothing to free */
case REDIS_REPLY_ARRAY:
if (r->element != NULL) {
for (j = 0; j < r->elements; j++)
if (r->element[j] != NULL)
freeReplyObject(r->element[j]);
free(r->element);
}
break;
case REDIS_REPLY_ERROR:
case REDIS_REPLY_STATUS:
case REDIS_REPLY_STRING:
if (r->str != NULL)
free(r->str);
break;
}
free(r);
}
static void *createStringObject(const redisReadTask *task, char *str, size_t len) {
redisReply *r, *parent;
char *buf;
r = createReplyObject(task->type);
if (r == NULL)
return NULL;
buf = malloc(len+1);
if (buf == NULL) {
freeReplyObject(r);
return NULL;
}
assert(task->type == REDIS_REPLY_ERROR ||
task->type == REDIS_REPLY_STATUS ||
task->type == REDIS_REPLY_STRING);
/* Copy string value */
memcpy(buf,str,len);
buf[len] = '\0';
r->str = buf;
r->len = len;
if (task->parent) {
parent = task->parent->obj;
assert(parent->type == REDIS_REPLY_ARRAY);
parent->element[task->idx] = r;
}
return r;
}
static void *createArrayObject(const redisReadTask *task, int elements) {
redisReply *r, *parent;
r = createReplyObject(REDIS_REPLY_ARRAY);
if (r == NULL)
return NULL;
if (elements > 0) {
r->element = calloc(elements,sizeof(redisReply*));
if (r->element == NULL) {
freeReplyObject(r);
return NULL;
}
}
r->elements = elements;
if (task->parent) {
parent = task->parent->obj;
assert(parent->type == REDIS_REPLY_ARRAY);
parent->element[task->idx] = r;
}
return r;
}
static void *createIntegerObject(const redisReadTask *task, long long value) {
redisReply *r, *parent;
r = createReplyObject(REDIS_REPLY_INTEGER);
if (r == NULL)
return NULL;
r->integer = value;
if (task->parent) {
parent = task->parent->obj;
assert(parent->type == REDIS_REPLY_ARRAY);
parent->element[task->idx] = r;
}
return r;
}
static void *createNilObject(const redisReadTask *task) {
redisReply *r, *parent;
r = createReplyObject(REDIS_REPLY_NIL);
if (r == NULL)
return NULL;
if (task->parent) {
parent = task->parent->obj;
assert(parent->type == REDIS_REPLY_ARRAY);
parent->element[task->idx] = r;
}
return r;
}
/* Return the number of digits of 'v' when converted to string in radix 10.
* Implementation borrowed from link in redis/src/util.c:string2ll(). */
static uint32_t countDigits(uint64_t v) {
uint32_t result = 1;
for (;;) {
if (v < 10) return result;
if (v < 100) return result + 1;
if (v < 1000) return result + 2;
if (v < 10000) return result + 3;
v /= 10000U;
result += 4;
}
}
/* Helper that calculates the bulk length given a certain string length. */
static size_t bulklen(size_t len) {
return 1+countDigits(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 error_type = 0; /* 0 = no error; -1 = memory error; -2 = format error */
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 memory_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 memory_err;
touched = 0;
}
} else {
newarg = sdscatlen(curarg,c,1);
if (newarg == NULL) goto memory_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 */
{
static const char intfmts[] = "diouxX";
static const char flags[] = "#0-+ ";
char _format[16];
const char *_p = c+1;
size_t _l = 0;
va_list _cpy;
/* Flags */
while (*_p != '\0' && strchr(flags,*_p) != NULL) _p++;
/* Field width */
while (*_p != '\0' && isdigit(*_p)) _p++;
/* Precision */
if (*_p == '.') {
_p++;
while (*_p != '\0' && isdigit(*_p)) _p++;
}
/* Copy va_list before consuming with va_arg */
va_copy(_cpy,ap);
/* Integer conversion (without modifiers) */
if (strchr(intfmts,*_p) != NULL) {
va_arg(ap,int);
goto fmt_valid;
}
/* Double conversion (without modifiers) */
if (strchr("eEfFgGaA",*_p) != NULL) {
va_arg(ap,double);
goto fmt_valid;
}
/* Size: char */
if (_p[0] == 'h' && _p[1] == 'h') {
_p += 2;
if (*_p != '\0' && strchr(intfmts,*_p) != NULL) {
va_arg(ap,int); /* char gets promoted to int */
goto fmt_valid;
}
goto fmt_invalid;
}
/* Size: short */
if (_p[0] == 'h') {
_p += 1;
if (*_p != '\0' && strchr(intfmts,*_p) != NULL) {
va_arg(ap,int); /* short gets promoted to int */
goto fmt_valid;
}
goto fmt_invalid;
}
/* Size: long long */
if (_p[0] == 'l' && _p[1] == 'l') {
_p += 2;
if (*_p != '\0' && strchr(intfmts,*_p) != NULL) {
va_arg(ap,long long);
goto fmt_valid;
}
goto fmt_invalid;
}
/* Size: long */
if (_p[0] == 'l') {
_p += 1;
if (*_p != '\0' && strchr(intfmts,*_p) != NULL) {
va_arg(ap,long);
goto fmt_valid;
}
goto fmt_invalid;
}
fmt_invalid:
va_end(_cpy);
goto format_err;
fmt_valid:
_l = (_p+1)-c;
if (_l < sizeof(_format)-2) {
memcpy(_format,c,_l);
_format[_l] = '\0';
newarg = sdscatvprintf(curarg,_format,_cpy);
/* Update current position (note: outer blocks
* increment c twice so compensate here) */
c = _p-1;
}
va_end(_cpy);
break;
}
}
if (newarg == NULL) goto memory_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 memory_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+countDigits(argc)+2;
/* Build the command at protocol level */
cmd = malloc(totlen+1);
if (cmd == NULL) goto memory_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;
format_err:
error_type = -2;
goto cleanup;
memory_err:
error_type = -1;
goto cleanup;
cleanup:
if (curargv) {
while(argc--)
sdsfree(curargv[argc]);
free(curargv);
}
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 error_type;
}
/* 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 as a size_t. 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);
/* The API says "-1" means bad result, but we now also return "-2" in some
* cases. Force the return value to always be -1. */
if (len < 0)
len = -1;
return len;
}
/* Format a command according to the Redis protocol using an sds string and
* sdscatfmt for the processing of arguments. 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 redisFormatSdsCommandArgv(sds *target, int argc, const char **argv,
const size_t *argvlen)
{
sds cmd;
unsigned long long totlen;
int j;
size_t len;
/* Abort on a NULL target */
if (target == NULL)
return -1;
/* Calculate our total size */
totlen = 1+countDigits(argc)+2;
for (j = 0; j < argc; j++) {
len = argvlen ? argvlen[j] : strlen(argv[j]);
totlen += bulklen(len);
}
/* Use an SDS string for command construction */
cmd = sdsempty();
if (cmd == NULL)
return -1;
/* We already know how much storage we need */
cmd = sdsMakeRoomFor(cmd, totlen);
if (cmd == NULL)
return -1;
/* Construct command */
cmd = sdscatfmt(cmd, "*%i\r\n", argc);
for (j=0; j < argc; j++) {
len = argvlen ? argvlen[j] : strlen(argv[j]);
cmd = sdscatfmt(cmd, "$%u\r\n", len);
cmd = sdscatlen(cmd, argv[j], len);
cmd = sdscatlen(cmd, "\r\n", sizeof("\r\n")-1);
}
assert(sdslen(cmd)==totlen);
*target = cmd;
return totlen;
}
void redisFreeSdsCommand(sds cmd) {
sdsfree(cmd);
}
/* 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;
/* Abort on a NULL target */
if (target == NULL)
return -1;
/* Calculate number of bytes needed for the command */
totlen = 1+countDigits(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 redisFreeCommand(char *cmd) {
free(cmd);
}
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);
__redis_strerror_r(errno, c->errstr, sizeof(c->errstr));
}
}
redisReader *redisReaderCreate(void) {
return redisReaderCreateWithFunctions(&defaultFunctions);
}
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();
c->tcp.host = NULL;
c->tcp.source_addr = NULL;
c->unix_sock.path = NULL;
c->timeout = NULL;
if (c->obuf == NULL || c->reader == NULL) {
redisFree(c);
return NULL;
}
return c;
}
void redisFree(redisContext *c) {
if (c == NULL)
return;
if (c->fd > 0)
close(c->fd);
if (c->obuf != NULL)
sdsfree(c->obuf);
if (c->reader != NULL)
redisReaderFree(c->reader);
if (c->tcp.host)
free(c->tcp.host);
if (c->tcp.source_addr)
free(c->tcp.source_addr);
if (c->unix_sock.path)
free(c->unix_sock.path);
if (c->timeout)
free(c->timeout);
free(c);
}
int redisFreeKeepFd(redisContext *c) {
int fd = c->fd;
c->fd = -1;
redisFree(c);
return fd;
}
int redisReconnect(redisContext *c) {
c->err = 0;
memset(c->errstr, '\0', strlen(c->errstr));
if (c->fd > 0) {
close(c->fd);
}
sdsfree(c->obuf);
redisReaderFree(c->reader);
c->obuf = sdsempty();
c->reader = redisReaderCreate();
if (c->connection_type == REDIS_CONN_TCP) {
return redisContextConnectBindTcp(c, c->tcp.host, c->tcp.port,
c->timeout, c->tcp.source_addr);
} else if (c->connection_type == REDIS_CONN_UNIX) {
return redisContextConnectUnix(c, c->unix_sock.path, c->timeout);
} else {
/* Something bad happened here and shouldn't have. There isn't
enough information in the context to reconnect. */
__redisSetError(c,REDIS_ERR_OTHER,"Not enough information to reconnect");
}
return REDIS_ERR;
}
/* 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;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags |= REDIS_BLOCK;
redisContextConnectTcp(c,ip,port,NULL);
return c;
}
redisContext *redisConnectWithTimeout(const char *ip, int port, const struct timeval tv) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags |= REDIS_BLOCK;
redisContextConnectTcp(c,ip,port,&tv);
return c;
}
redisContext *redisConnectNonBlock(const char *ip, int port) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags &= ~REDIS_BLOCK;
redisContextConnectTcp(c,ip,port,NULL);
return c;
}
redisContext *redisConnectBindNonBlock(const char *ip, int port,
const char *source_addr) {
redisContext *c = redisContextInit();
c->flags &= ~REDIS_BLOCK;
redisContextConnectBindTcp(c,ip,port,NULL,source_addr);
return c;
}
redisContext *redisConnectBindNonBlockWithReuse(const char *ip, int port,
const char *source_addr) {
redisContext *c = redisContextInit();
c->flags &= ~REDIS_BLOCK;
c->flags |= REDIS_REUSEADDR;
redisContextConnectBindTcp(c,ip,port,NULL,source_addr);
return c;
}
redisContext *redisConnectUnix(const char *path) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags |= REDIS_BLOCK;
redisContextConnectUnix(c,path,NULL);
return c;
}
redisContext *redisConnectUnixWithTimeout(const char *path, const struct timeval tv) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags |= REDIS_BLOCK;
redisContextConnectUnix(c,path,&tv);
return c;
}
redisContext *redisConnectUnixNonBlock(const char *path) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->flags &= ~REDIS_BLOCK;
redisContextConnectUnix(c,path,NULL);
return c;
}
redisContext *redisConnectFd(int fd) {
redisContext *c;
c = redisContextInit();
if (c == NULL)
return NULL;
c->fd = fd;
c->flags |= REDIS_BLOCK | REDIS_CONNECTED;
return c;
}
/* Set read/write timeout on a blocking socket. */
int redisSetTimeout(redisContext *c, const struct timeval tv) {
if (c->flags & REDIS_BLOCK)
return redisContextSetTimeout(c,tv);
return REDIS_ERR;
}
/* Enable connection KeepAlive. */
int redisEnableKeepAlive(redisContext *c) {
if (redisKeepAlive(c, REDIS_KEEPALIVE_INTERVAL) != REDIS_OK)
return REDIS_ERR;
return REDIS_OK;
}
/* 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[1024*16];
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)) || (errno == EINTR)) {
/* 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
* successfully written to the socket. When the buffer is empty after the
* write operation, "done" is set to 1 (if given).
*
* Returns REDIS_ERR if an error occurred trying to write and sets
* c->errstr 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)) || (errno == EINTR)) {
/* 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 {
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, const 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 redisAppendFormattedCommand(redisContext *c, const char *cmd, size_t len) {
if (__redisAppendCommand(c, cmd, len) != REDIS_OK) {
return REDIS_ERR;
}
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;
} else if (len == -2) {
__redisSetError(c,REDIS_ERR_OTHER,"Invalid format string");
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) {
sds cmd;
int len;
len = redisFormatSdsCommandArgv(&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) {
sdsfree(cmd);
return REDIS_ERR;
}
sdsfree(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 successfully 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;
va_start(ap,format);
void *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);
}