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Diffstat (limited to 'contrib/hiredis/hiredis.c')
| -rw-r--r-- | contrib/hiredis/hiredis.c | 1237 |
1 files changed, 1237 insertions, 0 deletions
diff --git a/contrib/hiredis/hiredis.c b/contrib/hiredis/hiredis.c new file mode 100644 index 000000000..9ea998ace --- /dev/null +++ b/contrib/hiredis/hiredis.c @@ -0,0 +1,1237 @@ +/* + * Copyright (c) 2009-2011, Salvatore Sanfilippo <antirez at gmail dot com> + * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Redis nor the names of its contributors may be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include "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; + + 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; +} + +static void __redisReaderSetError(redisReader *r, int type, const char *str) { + size_t len; + + if (r->reply != NULL && r->fn && r->fn->freeObject) { + r->fn->freeObject(r->reply); + r->reply = NULL; + } + + /* Clear input buffer on errors. */ + if (r->buf != NULL) { + sdsfree(r->buf); + r->buf = NULL; + r->pos = r->len = 0; + } + + /* Reset task stack. */ + r->ridx = -1; + + /* Set error. */ + r->err = type; + len = strlen(str); + len = len < (sizeof(r->errstr)-1) ? len : (sizeof(r->errstr)-1); + memcpy(r->errstr,str,len); + r->errstr[len] = '\0'; +} + +static size_t chrtos(char *buf, size_t size, char byte) { + size_t len = 0; + + switch(byte) { + case '\\': + case '"': + len = snprintf(buf,size,"\"\\%c\"",byte); + break; + case '\n': len = snprintf(buf,size,"\"\\n\""); break; + case '\r': len = snprintf(buf,size,"\"\\r\""); break; + case '\t': len = snprintf(buf,size,"\"\\t\""); break; + case '\a': len = snprintf(buf,size,"\"\\a\""); break; + case '\b': len = snprintf(buf,size,"\"\\b\""); break; + default: + if (isprint(byte)) + len = snprintf(buf,size,"\"%c\"",byte); + else + len = snprintf(buf,size,"\"\\x%02x\"",(unsigned char)byte); + break; + } + + return len; +} + +static void __redisReaderSetErrorProtocolByte(redisReader *r, char byte) { + char cbuf[8], sbuf[128]; + + chrtos(cbuf,sizeof(cbuf),byte); + snprintf(sbuf,sizeof(sbuf), + "Protocol error, got %s as reply type byte", cbuf); + __redisReaderSetError(r,REDIS_ERR_PROTOCOL,sbuf); +} + +static void __redisReaderSetErrorOOM(redisReader *r) { + __redisReaderSetError(r,REDIS_ERR_OOM,"Out of memory"); +} + +static char *readBytes(redisReader *r, unsigned int bytes) { + char *p; + if (r->len-r->pos >= bytes) { + p = r->buf+r->pos; + r->pos += bytes; + return p; + } + return NULL; +} + +/* Find pointer to \r\n. */ +static char *seekNewline(char *s, size_t len) { + int pos = 0; + int _len = len-1; + + /* Position should be < len-1 because the character at "pos" should be + * followed by a \n. Note that strchr cannot be used because it doesn't + * allow to search a limited length and the buffer that is being searched + * might not have a trailing NULL character. */ + while (pos < _len) { + while(pos < _len && s[pos] != '\r') pos++; + if (s[pos] != '\r') { + /* Not found. */ + return NULL; + } else { + if (s[pos+1] == '\n') { + /* Found. */ + return s+pos; + } else { + /* Continue searching. */ + pos++; + } + } + } + return NULL; +} + +/* Read a long long value starting at *s, under the assumption that it will be + * terminated by \r\n. Ambiguously returns -1 for unexpected input. */ +static long long readLongLong(char *s) { + long long v = 0; + int dec, mult = 1; + char c; + + if (*s == '-') { + mult = -1; + s++; + } else if (*s == '+') { + mult = 1; + s++; + } + + while ((c = *(s++)) != '\r') { + dec = c - '0'; + if (dec >= 0 && dec < 10) { + v *= 10; + v += dec; + } else { + /* Should not happen... */ + return -1; + } + } + + return mult*v; +} + +static char *readLine(redisReader *r, int *_len) { + char *p, *s; + int len; + + p = r->buf+r->pos; + s = seekNewline(p,(r->len-r->pos)); + if (s != NULL) { + len = s-(r->buf+r->pos); + r->pos += len+2; /* skip \r\n */ + if (_len) *_len = len; + return p; + } + return NULL; +} + +static void moveToNextTask(redisReader *r) { + redisReadTask *cur, *prv; + while (r->ridx >= 0) { + /* Return a.s.a.p. when the stack is now empty. */ + if (r->ridx == 0) { + r->ridx--; + return; + } + + cur = &(r->rstack[r->ridx]); + prv = &(r->rstack[r->ridx-1]); + assert(prv->type == REDIS_REPLY_ARRAY); + if (cur->idx == prv->elements-1) { + r->ridx--; + } else { + /* Reset the type because the next item can be anything */ + assert(cur->idx < prv->elements); + cur->type = -1; + cur->elements = -1; + cur->idx++; + return; + } + } +} + +static int processLineItem(redisReader *r) { + redisReadTask *cur = &(r->rstack[r->ridx]); + void *obj; + char *p; + int len; + + if ((p = readLine(r,&len)) != NULL) { + if (cur->type == REDIS_REPLY_INTEGER) { + if (r->fn && r->fn->createInteger) + obj = r->fn->createInteger(cur,readLongLong(p)); + else + obj = (void*)REDIS_REPLY_INTEGER; + } else { + /* Type will be error or status. */ + if (r->fn && r->fn->createString) + obj = r->fn->createString(cur,p,len); + else + obj = (void*)(size_t)(cur->type); + } + + if (obj == NULL) { + __redisReaderSetErrorOOM(r); + return REDIS_ERR; + } + + /* Set reply if this is the root object. */ + if (r->ridx == 0) r->reply = obj; + moveToNextTask(r); + return REDIS_OK; + } + + return REDIS_ERR; +} + +static int processBulkItem(redisReader *r) { + redisReadTask *cur = &(r->rstack[r->ridx]); + void *obj = NULL; + char *p, *s; + long len; + unsigned long bytelen; + int success = 0; + + p = r->buf+r->pos; + s = seekNewline(p,r->len-r->pos); + if (s != NULL) { + p = r->buf+r->pos; + bytelen = s-(r->buf+r->pos)+2; /* include \r\n */ + len = readLongLong(p); + + if (len < 0) { + /* The nil object can always be created. */ + if (r->fn && r->fn->createNil) + obj = r->fn->createNil(cur); + else + obj = (void*)REDIS_REPLY_NIL; + success = 1; + } else { + /* Only continue when the buffer contains the entire bulk item. */ + bytelen += len+2; /* include \r\n */ + if (r->pos+bytelen <= r->len) { + if (r->fn && r->fn->createString) + obj = r->fn->createString(cur,s+2,len); + else + obj = (void*)REDIS_REPLY_STRING; + success = 1; + } + } + + /* Proceed when obj was created. */ + if (success) { + if (obj == NULL) { + __redisReaderSetErrorOOM(r); + return REDIS_ERR; + } + + r->pos += bytelen; + + /* Set reply if this is the root object. */ + if (r->ridx == 0) r->reply = obj; + moveToNextTask(r); + return REDIS_OK; + } + } + + return REDIS_ERR; +} + +static int processMultiBulkItem(redisReader *r) { + redisReadTask *cur = &(r->rstack[r->ridx]); + void *obj; + char *p; + long elements; + int root = 0; + + /* Set error for nested multi bulks with depth > 1 */ + if (r->ridx == 2) { + __redisReaderSetError(r,REDIS_ERR_PROTOCOL, + "No support for nested multi bulk replies with depth > 1"); + return REDIS_ERR; + } + + if ((p = readLine(r,NULL)) != NULL) { + elements = readLongLong(p); + root = (r->ridx == 0); + + if (elements == -1) { + if (r->fn && r->fn->createNil) + obj = r->fn->createNil(cur); + else + obj = (void*)REDIS_REPLY_NIL; + + if (obj == NULL) { + __redisReaderSetErrorOOM(r); + return REDIS_ERR; + } + + moveToNextTask(r); + } else { + if (r->fn && r->fn->createArray) + obj = r->fn->createArray(cur,elements); + else + obj = (void*)REDIS_REPLY_ARRAY; + + if (obj == NULL) { + __redisReaderSetErrorOOM(r); + return REDIS_ERR; + } + + /* Modify task stack when there are more than 0 elements. */ + if (elements > 0) { + cur->elements = elements; + cur->obj = obj; + r->ridx++; + r->rstack[r->ridx].type = -1; + r->rstack[r->ridx].elements = -1; + r->rstack[r->ridx].idx = 0; + r->rstack[r->ridx].obj = NULL; + r->rstack[r->ridx].parent = cur; + r->rstack[r->ridx].privdata = r->privdata; + } else { + moveToNextTask(r); + } + } + + /* Set reply if this is the root object. */ + if (root) r->reply = obj; + return REDIS_OK; + } + + return REDIS_ERR; +} + +static int processItem(redisReader *r) { + redisReadTask *cur = &(r->rstack[r->ridx]); + char *p; + + /* 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: + __redisReaderSetErrorProtocolByte(r,*p); + return REDIS_ERR; + } + } else { + /* could not consume 1 byte */ + return REDIS_ERR; + } + } + + /* 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); + default: + assert(NULL); + return REDIS_ERR; /* Avoid warning. */ + } +} + +redisReader *redisReaderCreate(void) { + redisReader *r; + + r = calloc(sizeof(redisReader),1); + if (r == NULL) + return NULL; + + r->err = 0; + r->errstr[0] = '\0'; + 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); +} |