X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/a15742a41b30b742d58f4ed260a4a36f02bdd9ac..af0b220756571bc8faf57a0c7b7389dd86a60376:/src/t_string.c diff --git a/src/t_string.c b/src/t_string.c index bb6b4ece..00510c71 100644 --- a/src/t_string.c +++ b/src/t_string.c @@ -1,54 +1,88 @@ +/* + * Copyright (c) 2009-2012, Salvatore Sanfilippo + * 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 "redis.h" +#include /* isnan(), isinf() */ /*----------------------------------------------------------------------------- * String Commands *----------------------------------------------------------------------------*/ -void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) { - int retval; - long seconds = 0; /* initialized to avoid an harmness warning */ +static int checkStringLength(redisClient *c, long long size) { + if (size > 512*1024*1024) { + addReplyError(c,"string exceeds maximum allowed size (512MB)"); + return REDIS_ERR; + } + return REDIS_OK; +} + +void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire, int unit) { + long long milliseconds = 0; /* initialized to avoid an harmness warning */ if (expire) { - if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK) + if (getLongLongFromObjectOrReply(c, expire, &milliseconds, NULL) != REDIS_OK) return; - if (seconds <= 0) { + if (milliseconds <= 0) { addReplyError(c,"invalid expire time in SETEX"); return; } + if (unit == UNIT_SECONDS) milliseconds *= 1000; } - retval = dbAdd(c->db,key,val); - if (retval == REDIS_ERR) { - if (!nx) { - dbReplace(c->db,key,val); - incrRefCount(val); - } else { - addReply(c,shared.czero); - return; - } - } else { - incrRefCount(val); + if (nx && lookupKeyWrite(c->db,key) != NULL) { + addReply(c,shared.czero); + return; } - touchWatchedKey(c->db,key); + setKey(c->db,key,val); server.dirty++; - removeExpire(c->db,key); - if (expire) setExpire(c->db,key,time(NULL)+seconds); + if (expire) setExpire(c->db,key,mstime()+milliseconds); addReply(c, nx ? shared.cone : shared.ok); } void setCommand(redisClient *c) { c->argv[2] = tryObjectEncoding(c->argv[2]); - setGenericCommand(c,0,c->argv[1],c->argv[2],NULL); + setGenericCommand(c,0,c->argv[1],c->argv[2],NULL,0); } void setnxCommand(redisClient *c) { c->argv[2] = tryObjectEncoding(c->argv[2]); - setGenericCommand(c,1,c->argv[1],c->argv[2],NULL); + setGenericCommand(c,1,c->argv[1],c->argv[2],NULL,0); } void setexCommand(redisClient *c) { c->argv[3] = tryObjectEncoding(c->argv[3]); - setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]); + setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2],UNIT_SECONDS); +} + +void psetexCommand(redisClient *c) { + c->argv[3] = tryObjectEncoding(c->argv[3]); + setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2],UNIT_MILLISECONDS); } int getGenericCommand(redisClient *c) { @@ -73,11 +107,108 @@ void getCommand(redisClient *c) { void getsetCommand(redisClient *c) { if (getGenericCommand(c) == REDIS_ERR) return; c->argv[2] = tryObjectEncoding(c->argv[2]); - dbReplace(c->db,c->argv[1],c->argv[2]); - incrRefCount(c->argv[2]); - touchWatchedKey(c->db,c->argv[1]); + setKey(c->db,c->argv[1],c->argv[2]); server.dirty++; - removeExpire(c->db,c->argv[1]); +} + +void setrangeCommand(redisClient *c) { + robj *o; + long offset; + sds value = c->argv[3]->ptr; + + if (getLongFromObjectOrReply(c,c->argv[2],&offset,NULL) != REDIS_OK) + return; + + if (offset < 0) { + addReplyError(c,"offset is out of range"); + return; + } + + o = lookupKeyWrite(c->db,c->argv[1]); + if (o == NULL) { + /* Return 0 when setting nothing on a non-existing string */ + if (sdslen(value) == 0) { + addReply(c,shared.czero); + return; + } + + /* Return when the resulting string exceeds allowed size */ + if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK) + return; + + o = createObject(REDIS_STRING,sdsempty()); + dbAdd(c->db,c->argv[1],o); + } else { + size_t olen; + + /* Key exists, check type */ + if (checkType(c,o,REDIS_STRING)) + return; + + /* Return existing string length when setting nothing */ + olen = stringObjectLen(o); + if (sdslen(value) == 0) { + addReplyLongLong(c,olen); + return; + } + + /* Return when the resulting string exceeds allowed size */ + if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK) + return; + + /* Create a copy when the object is shared or encoded. */ + if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) { + robj *decoded = getDecodedObject(o); + o = createStringObject(decoded->ptr, sdslen(decoded->ptr)); + decrRefCount(decoded); + dbOverwrite(c->db,c->argv[1],o); + } + } + + if (sdslen(value) > 0) { + o->ptr = sdsgrowzero(o->ptr,offset+sdslen(value)); + memcpy((char*)o->ptr+offset,value,sdslen(value)); + signalModifiedKey(c->db,c->argv[1]); + server.dirty++; + } + addReplyLongLong(c,sdslen(o->ptr)); +} + +void getrangeCommand(redisClient *c) { + robj *o; + long start, end; + char *str, llbuf[32]; + size_t strlen; + + if (getLongFromObjectOrReply(c,c->argv[2],&start,NULL) != REDIS_OK) + return; + if (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != REDIS_OK) + return; + if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.emptybulk)) == NULL || + checkType(c,o,REDIS_STRING)) return; + + if (o->encoding == REDIS_ENCODING_INT) { + str = llbuf; + strlen = ll2string(llbuf,sizeof(llbuf),(long)o->ptr); + } else { + str = o->ptr; + strlen = sdslen(str); + } + + /* Convert negative indexes */ + if (start < 0) start = strlen+start; + if (end < 0) end = strlen+end; + if (start < 0) start = 0; + if (end < 0) end = 0; + if ((unsigned)end >= strlen) end = strlen-1; + + /* Precondition: end >= 0 && end < strlen, so the only condition where + * nothing can be returned is: start > end. */ + if (start > end) { + addReply(c,shared.emptybulk); + } else { + addReplyBulkCBuffer(c,(char*)str+start,end-start+1); + } } void mgetCommand(redisClient *c) { @@ -113,18 +244,15 @@ void msetGenericCommand(redisClient *c, int nx) { busykeys++; } } - } - if (busykeys) { - addReply(c, shared.czero); - return; + if (busykeys) { + addReply(c, shared.czero); + return; + } } for (j = 1; j < c->argc; j += 2) { c->argv[j+1] = tryObjectEncoding(c->argv[j+1]); - dbReplace(c->db,c->argv[j],c->argv[j+1]); - incrRefCount(c->argv[j+1]); - removeExpire(c->db,c->argv[j]); - touchWatchedKey(c->db,c->argv[j]); + setKey(c->db,c->argv[j],c->argv[j+1]); } server.dirty += (c->argc-1)/2; addReply(c, nx ? shared.cone : shared.ok); @@ -139,36 +267,29 @@ void msetnxCommand(redisClient *c) { } void incrDecrCommand(redisClient *c, long long incr) { - long long value; - robj *o; + long long value, oldvalue; + robj *o, *new; o = lookupKeyWrite(c->db,c->argv[1]); if (o != NULL && checkType(c,o,REDIS_STRING)) return; + if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return; - /* Fast path if the object is integer encoded and is not shared. */ - if (o && o->refcount == 1 && o->encoding == REDIS_ENCODING_INT) { - long long newval = ((long)o->ptr) + incr; - - if (newval < 0 && newval >= REDIS_SHARED_INTEGERS && - newval >= LONG_MIN && newval <= LONG_MAX) { - o->ptr = (void*) (long) newval; - touchWatchedKey(c->db,c->argv[1]); - server.dirty++; - addReplyLongLong(c,newval); - return; - } - /* ... else take the usual safe path */ + oldvalue = value; + if ((incr < 0 && oldvalue < 0 && incr < (LLONG_MIN-oldvalue)) || + (incr > 0 && oldvalue > 0 && incr > (LLONG_MAX-oldvalue))) { + addReplyError(c,"increment or decrement would overflow"); + return; } - - /* Otherwise we create a new object and replace the old one. */ - if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return; value += incr; - o = createStringObjectFromLongLong(value); - dbReplace(c->db,c->argv[1],o); - touchWatchedKey(c->db,c->argv[1]); + new = createStringObjectFromLongLong(value); + if (o) + dbOverwrite(c->db,c->argv[1],new); + else + dbAdd(c->db,c->argv[1],new); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; addReply(c,shared.colon); - addReply(c,o); + addReply(c,new); addReply(c,shared.crlf); } @@ -194,91 +315,81 @@ void decrbyCommand(redisClient *c) { incrDecrCommand(c,-incr); } +void incrbyfloatCommand(redisClient *c) { + long double incr, value; + robj *o, *new, *aux; + + o = lookupKeyWrite(c->db,c->argv[1]); + if (o != NULL && checkType(c,o,REDIS_STRING)) return; + if (getLongDoubleFromObjectOrReply(c,o,&value,NULL) != REDIS_OK || + getLongDoubleFromObjectOrReply(c,c->argv[2],&incr,NULL) != REDIS_OK) + return; + + value += incr; + if (isnan(value) || isinf(value)) { + addReplyError(c,"increment would produce NaN or Infinity"); + return; + } + new = createStringObjectFromLongDouble(value); + if (o) + dbOverwrite(c->db,c->argv[1],new); + else + dbAdd(c->db,c->argv[1],new); + signalModifiedKey(c->db,c->argv[1]); + server.dirty++; + addReplyBulk(c,new); + + /* Always replicate INCRBYFLOAT as a SET command with the final value + * in order to make sure that differences in float pricision or formatting + * will not create differences in replicas or after an AOF restart. */ + aux = createStringObject("SET",3); + rewriteClientCommandArgument(c,0,aux); + decrRefCount(aux); + rewriteClientCommandArgument(c,2,new); +} + void appendCommand(redisClient *c) { - int retval; size_t totlen; - robj *o; + robj *o, *append; o = lookupKeyWrite(c->db,c->argv[1]); - c->argv[2] = tryObjectEncoding(c->argv[2]); if (o == NULL) { /* Create the key */ - retval = dbAdd(c->db,c->argv[1],c->argv[2]); + c->argv[2] = tryObjectEncoding(c->argv[2]); + dbAdd(c->db,c->argv[1],c->argv[2]); incrRefCount(c->argv[2]); totlen = stringObjectLen(c->argv[2]); } else { - if (o->type != REDIS_STRING) { - addReply(c,shared.wrongtypeerr); + /* Key exists, check type */ + if (checkType(c,o,REDIS_STRING)) return; - } - /* If the object is specially encoded or shared we have to make - * a copy */ + + /* "append" is an argument, so always an sds */ + append = c->argv[2]; + totlen = stringObjectLen(o)+sdslen(append->ptr); + if (checkStringLength(c,totlen) != REDIS_OK) + return; + + /* If the object is shared or encoded, we have to make a copy */ if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) { robj *decoded = getDecodedObject(o); - o = createStringObject(decoded->ptr, sdslen(decoded->ptr)); decrRefCount(decoded); - dbReplace(c->db,c->argv[1],o); - } - /* APPEND! */ - if (c->argv[2]->encoding == REDIS_ENCODING_RAW) { - o->ptr = sdscatlen(o->ptr, - c->argv[2]->ptr, sdslen(c->argv[2]->ptr)); - } else { - o->ptr = sdscatprintf(o->ptr, "%ld", - (unsigned long) c->argv[2]->ptr); + dbOverwrite(c->db,c->argv[1],o); } + + /* Append the value */ + o->ptr = sdscatlen(o->ptr,append->ptr,sdslen(append->ptr)); totlen = sdslen(o->ptr); } - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; addReplyLongLong(c,totlen); } -void substrCommand(redisClient *c) { - robj *o; - long start = atoi(c->argv[2]->ptr); - long end = atoi(c->argv[3]->ptr); - size_t rangelen, strlen; - sds range; - - if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL || - checkType(c,o,REDIS_STRING)) return; - - o = getDecodedObject(o); - strlen = sdslen(o->ptr); - - /* convert negative indexes */ - if (start < 0) start = strlen+start; - if (end < 0) end = strlen+end; - if (start < 0) start = 0; - if (end < 0) end = 0; - - /* indexes sanity checks */ - if (start > end || (size_t)start >= strlen) { - /* Out of range start or start > end result in null reply */ - addReply(c,shared.nullbulk); - decrRefCount(o); - return; - } - if ((size_t)end >= strlen) end = strlen-1; - rangelen = (end-start)+1; - - /* Return the result */ - addReplySds(c,sdscatprintf(sdsempty(),"$%zu\r\n",rangelen)); - range = sdsnewlen((char*)o->ptr+start,rangelen); - addReplySds(c,range); - addReply(c,shared.crlf); - decrRefCount(o); -} - void strlenCommand(redisClient *c) { robj *o; - if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL || checkType(c,o,REDIS_STRING)) return; - - o = getDecodedObject(o); - addReplyLongLong(c,sdslen(o->ptr)); - decrRefCount(o); + addReplyLongLong(c,stringObjectLen(o)); }