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/*
* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez 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 "redis.h"
#include <math.h> /* isnan(), isinf() */
/* 方法 API */
static int checkStringLength(redisClient *c, long long size) /* 检查字符串长度是否超出限制最大长度，512*1024*1024个字节长度 */
void setGenericCommand(redisClient *c, int flags, robj *key, robj *val, robj *expire, int unit, robj *ok_reply, robj *abort_reply) /* 设置的泛型指令操作 */
void setCommand(redisClient *c) /* 设置的综合方法，设置都是根据Client中的参数而定 */
void setnxCommand(redisClient *c) /* key不存在的时候才设置值，flag为REDIS_SET_NX时 */
void setexCommand(redisClient *c) /* key存在的时候才设置值，flag为REDIS_SET_NO_FLAGS，命令到期时间单位为秒 */
void psetexCommand(redisClient *c) /* key存在的时候才设置值，flag为REDIS_SET_NO_FLAGS，命令到期时间单位为毫秒 */
int getGenericCommand(redisClient *c) /* 获取命令的泛型命令 */
void getCommand(redisClient *c) /* 获取命令的操作 */
void getsetCommand(redisClient *c) /* 获取set命令的操作 */
void setrangeCommand(redisClient *c) /* 设置rangge命令的操作 */
void getrangeCommand(redisClient *c) /* 获取range命令的操作 */
void mgetCommand(redisClient *c) /* 执行多次getCommand指令 */
void msetGenericCommand(redisClient *c, int nx) /* 一次运行多个设置操作泛型命令 */
void msetCommand(redisClient *c) /* 多次设置指令的非NX模式 */
void msetnxCommand(redisClient *c) /* 多次设置指令的NX模式,即只在不存在的时候才设置 */
void incrDecrCommand(redisClient *c, long long incr) /* 增加或减少固定值的操作，减少其实就是增加-1 */
void incrCommand(redisClient *c) /* 递增1操作，incr递增设置为1 */
void decrCommand(redisClient *c) /* 递减1操作，incr递增设置为-1 */
void incrbyCommand(redisClient *c) /* 增加指令，从Client中获取递增值 */
void decrbyCommand(redisClient *c) /* 减少指令，从Client中获取减少值 */
void incrbyfloatCommand(redisClient *c) /* 增加float类型值的操作命令，在获取原始值的时候，获取的方法不一样，为getLongDoubleFromObjectOrReply*/
void appendCommand(redisClient *c) /* 追加命令操作，其实也是key:value的形式 */
void strlenCommand(redisClient *c) /* 获取命令长度 */
/*-----------------------------------------------------------------------------
* String Commands
*----------------------------------------------------------------------------*/
/* 检查字符串长度是否超出限制最大长度，512*1024*1024个字节长度 */
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;
}
/* The setGenericCommand() function implements the SET operation with different
* options and variants. This function is called in order to implement the
* following commands: SET, SETEX, PSETEX, SETNX.
*
* 'flags' changes the behavior of the command (NX or XX, see belove).
*
* 'expire' represents an expire to set in form of a Redis object as passed
* by the user. It is interpreted according to the specified 'unit'.
*
* 'ok_reply' and 'abort_reply' is what the function will reply to the client
* if the operation is performed, or when it is not because of NX or
* XX flags.
*
* If ok_reply is NULL "+OK" is used.
* If abort_reply is NULL, "$-1" is used. */
/* SET操作的一些FLAG */
#define REDIS_SET_NO_FLAGS 0
#define REDIS_SET_NX (1<<0) /* Set if key not exists. */
#define REDIS_SET_XX (1<<1) /* Set if key exists. */
/* 设置命令的泛型命令 */
void setGenericCommand(redisClient *c, int flags, robj *key, robj *val, robj *expire, int unit, robj *ok_reply, robj *abort_reply) {
long long milliseconds = 0; /* initialized to avoid any harmness warning */
if (expire) {
if (getLongLongFromObjectOrReply(c, expire, &milliseconds, NULL) != REDIS_OK)
return;
if (milliseconds <= 0) {
addReplyErrorFormat(c,"invalid expire time in %s",c->cmd->name);
return;
}
if (unit == UNIT_SECONDS) milliseconds *= 1000;
}
if ((flags & REDIS_SET_NX && lookupKeyWrite(c->db,key) != NULL) ||
(flags & REDIS_SET_XX && lookupKeyWrite(c->db,key) == NULL))
{
addReply(c, abort_reply ? abort_reply : shared.nullbulk);
return;
}
setKey(c->db,key,val);
server.dirty++;
if (expire) setExpire(c->db,key,mstime()+milliseconds);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"set",key,c->db->id);
if (expire) notifyKeyspaceEvent(REDIS_NOTIFY_GENERIC,
"expire",key,c->db->id);
addReply(c, ok_reply ? ok_reply : shared.ok);
}
/* SET key value [NX] [XX] [EX <seconds>] [PX <milliseconds>] */
void setCommand(redisClient *c) {
int j;
robj *expire = NULL;
int unit = UNIT_SECONDS;
int flags = REDIS_SET_NO_FLAGS;
for (j = 3; j < c->argc; j++) {
char *a = c->argv[j]->ptr;
robj *next = (j == c->argc-1) ? NULL : c->argv[j+1];
/* 通过参数，判断是哪种SET命令操作 */
if ((a[0] == 'n' || a[0] == 'N') &&
(a[1] == 'x' || a[1] == 'X') && a[2] == '\0') {
flags |= REDIS_SET_NX;
} else if ((a[0] == 'x' || a[0] == 'X') &&
(a[1] == 'x' || a[1] == 'X') && a[2] == '\0') {
flags |= REDIS_SET_XX;
} else if ((a[0] == 'e' || a[0] == 'E') &&
(a[1] == 'x' || a[1] == 'X') && a[2] == '\0' && next) {
unit = UNIT_SECONDS;
expire = next;
j++;
} else if ((a[0] == 'p' || a[0] == 'P') &&
(a[1] == 'x' || a[1] == 'X') && a[2] == '\0' && next) {
unit = UNIT_MILLISECONDS;
expire = next;
j++;
} else {
addReply(c,shared.syntaxerr);
return;
}
}
//实际调用设置泛型指令方法
c->argv[2] = tryObjectEncoding(c->argv[2]);
setGenericCommand(c,flags,c->argv[1],c->argv[2],expire,unit,NULL,NULL);
}
/* key不存在的时候才设置值，flag为REDIS_SET_NX时 */
void setnxCommand(redisClient *c) {
c->argv[2] = tryObjectEncoding(c->argv[2]);
setGenericCommand(c,REDIS_SET_NX,c->argv[1],c->argv[2],NULL,0,shared.cone,shared.czero);
}
/* key存在的时候才设置值，flag为REDIS_SET_NO_FLAGS，命令到期时间单位为秒 */
void setexCommand(redisClient *c) {
c->argv[3] = tryObjectEncoding(c->argv[3]);
setGenericCommand(c,REDIS_SET_NO_FLAGS,c->argv[1],c->argv[3],c->argv[2],UNIT_SECONDS,NULL,NULL);
}
/* key存在的时候才设置值，flag为REDIS_SET_NO_FLAGS，命令到期时间单位为毫秒 */
void psetexCommand(redisClient *c) {
c->argv[3] = tryObjectEncoding(c->argv[3]);
setGenericCommand(c,REDIS_SET_NO_FLAGS,c->argv[1],c->argv[3],c->argv[2],UNIT_MILLISECONDS,NULL,NULL);
}
int getGenericCommand(redisClient *c) {
robj *o;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL)
return REDIS_OK;
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
return REDIS_ERR;
} else {
addReplyBulk(c,o);
return REDIS_OK;
}
}
void getCommand(redisClient *c) {
getGenericCommand(c);
}
void getsetCommand(redisClient *c) {
if (getGenericCommand(c) == REDIS_ERR) return;
c->argv[2] = tryObjectEncoding(c->argv[2]);
//获取到命令后会调用到set操作
setKey(c->db,c->argv[1],c->argv[2]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"set",c->argv[1],c->db->id);
server.dirty++;
}
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. */
o = dbUnshareStringValue(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]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,
"setrange",c->argv[1],c->db->id);
server.dirty++;
}
addReplyLongLong(c,sdslen(o->ptr));
}
void getrangeCommand(redisClient *c) {
robj *o;
long long start, end;
char *str, llbuf[32];
size_t strlen;
if (getLongLongFromObjectOrReply(c,c->argv[2],&start,NULL) != REDIS_OK)
return;
if (getLongLongFromObjectOrReply(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 long long)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 || strlen == 0) {
addReply(c,shared.emptybulk);
} else {
addReplyBulkCBuffer(c,(char*)str+start,end-start+1);
}
}
/* 执行多次getCommand指令 */
void mgetCommand(redisClient *c) {
int j;
addReplyMultiBulkLen(c,c->argc-1);
for (j = 1; j < c->argc; j++) {
robj *o = lookupKeyRead(c->db,c->argv[j]);
if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
if (o->type != REDIS_STRING) {
addReply(c,shared.nullbulk);
} else {
addReplyBulk(c,o);
}
}
}
}
/* 一次运行多个设置操作泛型命令 */
void msetGenericCommand(redisClient *c, int nx) {
int j, busykeys = 0;
/* 设置操作一定是成对出现的 */
if ((c->argc % 2) == 0) {
addReplyError(c,"wrong number of arguments for MSET");
return;
}
/* Handle the NX flag. The MSETNX semantic is to return zero and don't
* set nothing at all if at least one already key exists. */
if (nx) {
for (j = 1; j < c->argc; j += 2) {
if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
busykeys++;
}
}
//如果key存在，返回0
if (busykeys) {
addReply(c, shared.czero);
return;
}
}
//隔2个执行设置key操作指令一次
for (j = 1; j < c->argc; j += 2) {
c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
setKey(c->db,c->argv[j],c->argv[j+1]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"set",c->argv[j],c->db->id);
}
server.dirty += (c->argc-1)/2;
addReply(c, nx ? shared.cone : shared.ok);
}
/* 多次设置指令的非NX模式 */
void msetCommand(redisClient *c) {
msetGenericCommand(c,0);
}
/* 多次设置指令的NX模式,即只在不存在的时候才设置 */
void msetnxCommand(redisClient *c) {
msetGenericCommand(c,1);
}
/* 增加或减少固定值的操作，减少其实就是增加-1 */
void incrDecrCommand(redisClient *c, long long incr) {
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;
//将原始值赋值为旧值
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;
}
//将值实现递增操作
value += incr;
new = createStringObjectFromLongLong(value);
//将值存入数据库中
if (o)
dbOverwrite(c->db,c->argv[1],new);
else
dbAdd(c->db,c->argv[1],new);
//添加返回消息
signalModifiedKey(c->db,c->argv[1]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"incrby",c->argv[1],c->db->id);
server.dirty++;
addReply(c,shared.colon);
addReply(c,new);
addReply(c,shared.crlf);
}
/* 递增1操作，incr递增设置为1 */
void incrCommand(redisClient *c) {
incrDecrCommand(c,1);
}
/* 递减1操作，incr递增设置为-1 */
void decrCommand(redisClient *c) {
incrDecrCommand(c,-1);
}
/* 增加指令，从Client中获取递增值 */
void incrbyCommand(redisClient *c) {
long long incr;
if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
incrDecrCommand(c,incr);
}
/* 减少指令，从Client中获取减少值 */
void decrbyCommand(redisClient *c) {
long long incr;
if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
incrDecrCommand(c,-incr);
}
/* 增加float类型值的操作命令，在获取原始值的时候，获取的方法不一样，为getLongDoubleFromObjectOrReply*/
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;
/* 在获取原始值的时候，获取的方法不一样，为getLongDoubleFromObjectOrReply */
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]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"incrbyfloat",c->argv[1],c->db->id);
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 precision 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);
}
/* 追加命令操作，其实也是字符串的形式，以参数的形式的添加 */
void appendCommand(redisClient *c) {
size_t totlen;
robj *o, *append;
o = lookupKeyWrite(c->db,c->argv[1]);
if (o == NULL) {
/* Create the key */
//如果不存在key的值
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 {
/* Key exists, check type */
if (checkType(c,o,REDIS_STRING))
return;
/* "append" is an argument, so always an sds */
//赋值命令字符串
append = c->argv[2];
totlen = stringObjectLen(o)+sdslen(append->ptr);
if (checkStringLength(c,totlen) != REDIS_OK)
return;
/* Append the value */
//追加命令字符串
o = dbUnshareStringValue(c->db,c->argv[1],o);
o->ptr = sdscatlen(o->ptr,append->ptr,sdslen(append->ptr));
totlen = sdslen(o->ptr);
}
//获取回复
signalModifiedKey(c->db,c->argv[1]);
notifyKeyspaceEvent(REDIS_NOTIFY_STRING,"append",c->argv[1],c->db->id);
server.dirty++;
addReplyLongLong(c,totlen);
}
/* 获取命令长度 */
void strlenCommand(redisClient *c) {
robj *o;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,o,REDIS_STRING)) return;
addReplyLongLong(c,stringObjectLen(o));
}