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server.c
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server.c
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/*
* Copyright (c) 2009-2016, 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 "server.h"
#include "cluster.h"
#include "slowlog.h"
#include "bio.h"
#include "latency.h"
#include "atomicvar.h"
#include <time.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <limits.h>
#include <float.h>
#include <math.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <locale.h>
#include <sys/socket.h>
/* Our shared "common" objects */
struct sharedObjectsStruct shared;
/* Global vars that are actually used as constants. The following double
* values are used for double on-disk serialization, and are initialized
* at runtime to avoid strange compiler optimizations. */
double R_Zero, R_PosInf, R_NegInf, R_Nan;
/*================================= Globals ================================= */
/* Global vars */
struct redisServer server; /* Server global state */
volatile unsigned long lru_clock; /* Server global current LRU time. */
/* Our command table.
*
* Every entry is composed of the following fields:
*
* name: a string representing the command name.
* function: pointer to the C function implementing the command.
* arity: number of arguments, it is possible to use -N to say >= N
* sflags: command flags as string. See below for a table of flags.
* flags: flags as bitmask. Computed by Redis using the 'sflags' field.
* get_keys_proc: an optional function to get key arguments from a command.
* This is only used when the following three fields are not
* enough to specify what arguments are keys.
* first_key_index: first argument that is a key
* last_key_index: last argument that is a key
* key_step: step to get all the keys from first to last argument. For instance
* in MSET the step is two since arguments are key,val,key,val,...
* microseconds: microseconds of total execution time for this command.
* calls: total number of calls of this command.
*
* The flags, microseconds and calls fields are computed by Redis and should
* always be set to zero.
*
* Command flags are expressed using strings where every character represents
* a flag. Later the populateCommandTable() function will take care of
* populating the real 'flags' field using this characters.
*
* This is the meaning of the flags:
*
* w: write command (may modify the key space).
* r: read command (will never modify the key space).
* m: may increase memory usage once called. Don't allow if out of memory.
* a: admin command, like SAVE or SHUTDOWN.
* p: Pub/Sub related command.
* f: force replication of this command, regardless of server.dirty.
* s: command not allowed in scripts.
* R: random command. Command is not deterministic, that is, the same command
* with the same arguments, with the same key space, may have different
* results. For instance SPOP and RANDOMKEY are two random commands.
* S: Sort command output array if called from script, so that the output
* is deterministic.
* l: Allow command while loading the database.
* t: Allow command while a slave has stale data but is not allowed to
* server this data. Normally no command is accepted in this condition
* but just a few.
* M: Do not automatically propagate the command on MONITOR.
* k: Perform an implicit ASKING for this command, so the command will be
* accepted in cluster mode if the slot is marked as 'importing'.
* F: Fast command: O(1) or O(log(N)) command that should never delay
* its execution as long as the kernel scheduler is giving us time.
* Note that commands that may trigger a DEL as a side effect (like SET)
* are not fast commands.
*/
struct redisCommand redisCommandTable[] = {
{"module",moduleCommand,-2,"as",0,NULL,0,0,0,0,0},
{"get",getCommand,2,"rF",0,NULL,1,1,1,0,0},
{"set",setCommand,-3,"wm",0,NULL,1,1,1,0,0},
{"setnx",setnxCommand,3,"wmF",0,NULL,1,1,1,0,0},
{"setex",setexCommand,4,"wm",0,NULL,1,1,1,0,0},
{"psetex",psetexCommand,4,"wm",0,NULL,1,1,1,0,0},
{"append",appendCommand,3,"wm",0,NULL,1,1,1,0,0},
{"strlen",strlenCommand,2,"rF",0,NULL,1,1,1,0,0},
{"del",delCommand,-2,"w",0,NULL,1,-1,1,0,0},
{"unlink",unlinkCommand,-2,"wF",0,NULL,1,-1,1,0,0},
{"exists",existsCommand,-2,"rF",0,NULL,1,-1,1,0,0},
{"setbit",setbitCommand,4,"wm",0,NULL,1,1,1,0,0},
{"getbit",getbitCommand,3,"rF",0,NULL,1,1,1,0,0},
{"bitfield",bitfieldCommand,-2,"wm",0,NULL,1,1,1,0,0},
{"setrange",setrangeCommand,4,"wm",0,NULL,1,1,1,0,0},
{"getrange",getrangeCommand,4,"r",0,NULL,1,1,1,0,0},
{"substr",getrangeCommand,4,"r",0,NULL,1,1,1,0,0},
{"incr",incrCommand,2,"wmF",0,NULL,1,1,1,0,0},
{"decr",decrCommand,2,"wmF",0,NULL,1,1,1,0,0},
{"mget",mgetCommand,-2,"rF",0,NULL,1,-1,1,0,0},
{"rpush",rpushCommand,-3,"wmF",0,NULL,1,1,1,0,0},
{"lpush",lpushCommand,-3,"wmF",0,NULL,1,1,1,0,0},
{"rpushx",rpushxCommand,-3,"wmF",0,NULL,1,1,1,0,0},
{"lpushx",lpushxCommand,-3,"wmF",0,NULL,1,1,1,0,0},
{"linsert",linsertCommand,5,"wm",0,NULL,1,1,1,0,0},
{"rpop",rpopCommand,2,"wF",0,NULL,1,1,1,0,0},
{"lpop",lpopCommand,2,"wF",0,NULL,1,1,1,0,0},
{"brpop",brpopCommand,-3,"ws",0,NULL,1,-2,1,0,0},
{"brpoplpush",brpoplpushCommand,4,"wms",0,NULL,1,2,1,0,0},
{"blpop",blpopCommand,-3,"ws",0,NULL,1,-2,1,0,0},
{"llen",llenCommand,2,"rF",0,NULL,1,1,1,0,0},
{"lindex",lindexCommand,3,"r",0,NULL,1,1,1,0,0},
{"lset",lsetCommand,4,"wm",0,NULL,1,1,1,0,0},
{"lrange",lrangeCommand,4,"r",0,NULL,1,1,1,0,0},
{"ltrim",ltrimCommand,4,"w",0,NULL,1,1,1,0,0},
{"lrem",lremCommand,4,"w",0,NULL,1,1,1,0,0},
{"rpoplpush",rpoplpushCommand,3,"wm",0,NULL,1,2,1,0,0},
{"sadd",saddCommand,-3,"wmF",0,NULL,1,1,1,0,0},
{"srem",sremCommand,-3,"wF",0,NULL,1,1,1,0,0},
{"smove",smoveCommand,4,"wF",0,NULL,1,2,1,0,0},
{"sismember",sismemberCommand,3,"rF",0,NULL,1,1,1,0,0},
{"scard",scardCommand,2,"rF",0,NULL,1,1,1,0,0},
{"spop",spopCommand,-2,"wRF",0,NULL,1,1,1,0,0},
{"srandmember",srandmemberCommand,-2,"rR",0,NULL,1,1,1,0,0},
{"sinter",sinterCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sinterstore",sinterstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
{"sunion",sunionCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sunionstore",sunionstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
{"sdiff",sdiffCommand,-2,"rS",0,NULL,1,-1,1,0,0},
{"sdiffstore",sdiffstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
{"smembers",sinterCommand,2,"rS",0,NULL,1,1,1,0,0},
{"sscan",sscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
{"zadd",zaddCommand,-4,"wmF",0,NULL,1,1,1,0,0},
{"zincrby",zincrbyCommand,4,"wmF",0,NULL,1,1,1,0,0},
{"zrem",zremCommand,-3,"wF",0,NULL,1,1,1,0,0},
{"zremrangebyscore",zremrangebyscoreCommand,4,"w",0,NULL,1,1,1,0,0},
{"zremrangebyrank",zremrangebyrankCommand,4,"w",0,NULL,1,1,1,0,0},
{"zremrangebylex",zremrangebylexCommand,4,"w",0,NULL,1,1,1,0,0},
{"zunionstore",zunionstoreCommand,-4,"wm",0,zunionInterGetKeys,0,0,0,0,0},
{"zinterstore",zinterstoreCommand,-4,"wm",0,zunionInterGetKeys,0,0,0,0,0},
{"zrange",zrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zrangebyscore",zrangebyscoreCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zrevrangebyscore",zrevrangebyscoreCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zrangebylex",zrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zrevrangebylex",zrevrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zcount",zcountCommand,4,"rF",0,NULL,1,1,1,0,0},
{"zlexcount",zlexcountCommand,4,"rF",0,NULL,1,1,1,0,0},
{"zrevrange",zrevrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"zcard",zcardCommand,2,"rF",0,NULL,1,1,1,0,0},
{"zscore",zscoreCommand,3,"rF",0,NULL,1,1,1,0,0},
{"zrank",zrankCommand,3,"rF",0,NULL,1,1,1,0,0},
{"zrevrank",zrevrankCommand,3,"rF",0,NULL,1,1,1,0,0},
{"zscan",zscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
{"zpopmin",zpopminCommand,-2,"wF",0,NULL,1,1,1,0,0},
{"zpopmax",zpopmaxCommand,-2,"wF",0,NULL,1,1,1,0,0},
{"bzpopmin",bzpopminCommand,-3,"wsF",0,NULL,1,-2,1,0,0},
{"bzpopmax",bzpopmaxCommand,-3,"wsF",0,NULL,1,-2,1,0,0},
{"hset",hsetCommand,-4,"wmF",0,NULL,1,1,1,0,0},
{"hsetnx",hsetnxCommand,4,"wmF",0,NULL,1,1,1,0,0},
{"hget",hgetCommand,3,"rF",0,NULL,1,1,1,0,0},
{"hmset",hsetCommand,-4,"wmF",0,NULL,1,1,1,0,0},
{"hmget",hmgetCommand,-3,"rF",0,NULL,1,1,1,0,0},
{"hincrby",hincrbyCommand,4,"wmF",0,NULL,1,1,1,0,0},
{"hincrbyfloat",hincrbyfloatCommand,4,"wmF",0,NULL,1,1,1,0,0},
{"hdel",hdelCommand,-3,"wF",0,NULL,1,1,1,0,0},
{"hlen",hlenCommand,2,"rF",0,NULL,1,1,1,0,0},
{"hstrlen",hstrlenCommand,3,"rF",0,NULL,1,1,1,0,0},
{"hkeys",hkeysCommand,2,"rS",0,NULL,1,1,1,0,0},
{"hvals",hvalsCommand,2,"rS",0,NULL,1,1,1,0,0},
{"hgetall",hgetallCommand,2,"rR",0,NULL,1,1,1,0,0},
{"hexists",hexistsCommand,3,"rF",0,NULL,1,1,1,0,0},
{"hscan",hscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
{"incrby",incrbyCommand,3,"wmF",0,NULL,1,1,1,0,0},
{"decrby",decrbyCommand,3,"wmF",0,NULL,1,1,1,0,0},
{"incrbyfloat",incrbyfloatCommand,3,"wmF",0,NULL,1,1,1,0,0},
{"getset",getsetCommand,3,"wm",0,NULL,1,1,1,0,0},
{"mset",msetCommand,-3,"wm",0,NULL,1,-1,2,0,0},
{"msetnx",msetnxCommand,-3,"wm",0,NULL,1,-1,2,0,0},
{"randomkey",randomkeyCommand,1,"rR",0,NULL,0,0,0,0,0},
{"select",selectCommand,2,"lF",0,NULL,0,0,0,0,0},
{"swapdb",swapdbCommand,3,"wF",0,NULL,0,0,0,0,0},
{"move",moveCommand,3,"wF",0,NULL,1,1,1,0,0},
{"rename",renameCommand,3,"w",0,NULL,1,2,1,0,0},
{"renamenx",renamenxCommand,3,"wF",0,NULL,1,2,1,0,0},
{"expire",expireCommand,3,"wF",0,NULL,1,1,1,0,0},
{"expireat",expireatCommand,3,"wF",0,NULL,1,1,1,0,0},
{"pexpire",pexpireCommand,3,"wF",0,NULL,1,1,1,0,0},
{"pexpireat",pexpireatCommand,3,"wF",0,NULL,1,1,1,0,0},
{"keys",keysCommand,2,"rS",0,NULL,0,0,0,0,0},
{"scan",scanCommand,-2,"rR",0,NULL,0,0,0,0,0},
{"dbsize",dbsizeCommand,1,"rF",0,NULL,0,0,0,0,0},
{"auth",authCommand,2,"sltF",0,NULL,0,0,0,0,0},
{"ping",pingCommand,-1,"tF",0,NULL,0,0,0,0,0},
{"echo",echoCommand,2,"F",0,NULL,0,0,0,0,0},
{"save",saveCommand,1,"as",0,NULL,0,0,0,0,0},
{"bgsave",bgsaveCommand,-1,"as",0,NULL,0,0,0,0,0},
{"bgrewriteaof",bgrewriteaofCommand,1,"as",0,NULL,0,0,0,0,0},
{"shutdown",shutdownCommand,-1,"aslt",0,NULL,0,0,0,0,0},
{"lastsave",lastsaveCommand,1,"RF",0,NULL,0,0,0,0,0},
{"type",typeCommand,2,"rF",0,NULL,1,1,1,0,0},
{"multi",multiCommand,1,"sF",0,NULL,0,0,0,0,0},
{"exec",execCommand,1,"sM",0,NULL,0,0,0,0,0},
{"discard",discardCommand,1,"sF",0,NULL,0,0,0,0,0},
{"sync",syncCommand,1,"ars",0,NULL,0,0,0,0,0},
{"psync",syncCommand,3,"ars",0,NULL,0,0,0,0,0},
{"replconf",replconfCommand,-1,"aslt",0,NULL,0,0,0,0,0},
{"flushdb",flushdbCommand,-1,"w",0,NULL,0,0,0,0,0},
{"flushall",flushallCommand,-1,"w",0,NULL,0,0,0,0,0},
{"sort",sortCommand,-2,"wm",0,sortGetKeys,1,1,1,0,0},
{"info",infoCommand,-1,"ltR",0,NULL,0,0,0,0,0},
{"monitor",monitorCommand,1,"as",0,NULL,0,0,0,0,0},
{"ttl",ttlCommand,2,"rFR",0,NULL,1,1,1,0,0},
{"touch",touchCommand,-2,"rF",0,NULL,1,1,1,0,0},
{"pttl",pttlCommand,2,"rFR",0,NULL,1,1,1,0,0},
{"persist",persistCommand,2,"wF",0,NULL,1,1,1,0,0},
{"slaveof",replicaofCommand,3,"ast",0,NULL,0,0,0,0,0},
{"replicaof",replicaofCommand,3,"ast",0,NULL,0,0,0,0,0},
{"role",roleCommand,1,"lst",0,NULL,0,0,0,0,0},
{"debug",debugCommand,-2,"as",0,NULL,0,0,0,0,0},
{"config",configCommand,-2,"last",0,NULL,0,0,0,0,0},
{"subscribe",subscribeCommand,-2,"pslt",0,NULL,0,0,0,0,0},
{"unsubscribe",unsubscribeCommand,-1,"pslt",0,NULL,0,0,0,0,0},
{"psubscribe",psubscribeCommand,-2,"pslt",0,NULL,0,0,0,0,0},
{"punsubscribe",punsubscribeCommand,-1,"pslt",0,NULL,0,0,0,0,0},
{"publish",publishCommand,3,"pltF",0,NULL,0,0,0,0,0},
{"pubsub",pubsubCommand,-2,"pltR",0,NULL,0,0,0,0,0},
{"watch",watchCommand,-2,"sF",0,NULL,1,-1,1,0,0},
{"unwatch",unwatchCommand,1,"sF",0,NULL,0,0,0,0,0},
{"cluster",clusterCommand,-2,"a",0,NULL,0,0,0,0,0},
{"restore",restoreCommand,-4,"wm",0,NULL,1,1,1,0,0},
{"restore-asking",restoreCommand,-4,"wmk",0,NULL,1,1,1,0,0},
{"migrate",migrateCommand,-6,"wR",0,migrateGetKeys,0,0,0,0,0},
{"asking",askingCommand,1,"F",0,NULL,0,0,0,0,0},
{"readonly",readonlyCommand,1,"F",0,NULL,0,0,0,0,0},
{"readwrite",readwriteCommand,1,"F",0,NULL,0,0,0,0,0},
{"dump",dumpCommand,2,"rR",0,NULL,1,1,1,0,0},
{"object",objectCommand,-2,"rR",0,NULL,2,2,1,0,0},
{"memory",memoryCommand,-2,"rR",0,NULL,0,0,0,0,0},
{"client",clientCommand,-2,"as",0,NULL,0,0,0,0,0},
{"eval",evalCommand,-3,"s",0,evalGetKeys,0,0,0,0,0},
{"evalsha",evalShaCommand,-3,"s",0,evalGetKeys,0,0,0,0,0},
{"slowlog",slowlogCommand,-2,"aR",0,NULL,0,0,0,0,0},
{"script",scriptCommand,-2,"s",0,NULL,0,0,0,0,0},
{"time",timeCommand,1,"RF",0,NULL,0,0,0,0,0},
{"bitop",bitopCommand,-4,"wm",0,NULL,2,-1,1,0,0},
{"bitcount",bitcountCommand,-2,"r",0,NULL,1,1,1,0,0},
{"bitpos",bitposCommand,-3,"r",0,NULL,1,1,1,0,0},
{"wait",waitCommand,3,"s",0,NULL,0,0,0,0,0},
{"command",commandCommand,0,"ltR",0,NULL,0,0,0,0,0},
{"geoadd",geoaddCommand,-5,"wm",0,NULL,1,1,1,0,0},
{"georadius",georadiusCommand,-6,"w",0,georadiusGetKeys,1,1,1,0,0},
{"georadius_ro",georadiusroCommand,-6,"r",0,georadiusGetKeys,1,1,1,0,0},
{"georadiusbymember",georadiusbymemberCommand,-5,"w",0,georadiusGetKeys,1,1,1,0,0},
{"georadiusbymember_ro",georadiusbymemberroCommand,-5,"r",0,georadiusGetKeys,1,1,1,0,0},
{"geohash",geohashCommand,-2,"r",0,NULL,1,1,1,0,0},
{"geopos",geoposCommand,-2,"r",0,NULL,1,1,1,0,0},
{"geodist",geodistCommand,-4,"r",0,NULL,1,1,1,0,0},
{"pfselftest",pfselftestCommand,1,"a",0,NULL,0,0,0,0,0},
{"pfadd",pfaddCommand,-2,"wmF",0,NULL,1,1,1,0,0},
{"pfcount",pfcountCommand,-2,"r",0,NULL,1,-1,1,0,0},
{"pfmerge",pfmergeCommand,-2,"wm",0,NULL,1,-1,1,0,0},
{"pfdebug",pfdebugCommand,-3,"w",0,NULL,0,0,0,0,0},
{"xadd",xaddCommand,-5,"wmFR",0,NULL,1,1,1,0,0},
{"xrange",xrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"xrevrange",xrevrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"xlen",xlenCommand,2,"rF",0,NULL,1,1,1,0,0},
{"xread",xreadCommand,-4,"rs",0,xreadGetKeys,1,1,1,0,0},
{"xreadgroup",xreadCommand,-7,"ws",0,xreadGetKeys,1,1,1,0,0},
{"xgroup",xgroupCommand,-2,"wm",0,NULL,2,2,1,0,0},
{"xsetid",xsetidCommand,3,"wmF",0,NULL,1,1,1,0,0},
{"xack",xackCommand,-4,"wF",0,NULL,1,1,1,0,0},
{"xpending",xpendingCommand,-3,"rR",0,NULL,1,1,1,0,0},
{"xclaim",xclaimCommand,-6,"wRF",0,NULL,1,1,1,0,0},
{"xinfo",xinfoCommand,-2,"rR",0,NULL,2,2,1,0,0},
{"xdel",xdelCommand,-3,"wF",0,NULL,1,1,1,0,0},
{"xtrim",xtrimCommand,-2,"wFR",0,NULL,1,1,1,0,0},
{"post",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
{"host:",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
{"latency",latencyCommand,-2,"aslt",0,NULL,0,0,0,0,0},
{"lolwut",lolwutCommand,-1,"r",0,NULL,0,0,0,0,0}
};
/*============================ Utility functions ============================ */
/* We use a private localtime implementation which is fork-safe. The logging
* function of Redis may be called from other threads. */
void nolocks_localtime(struct tm *tmp, time_t t, time_t tz, int dst);
/* Low level logging. To use only for very big messages, otherwise
* serverLog() is to prefer. */
void serverLogRaw(int level, const char *msg) {
const int syslogLevelMap[] = { LOG_DEBUG, LOG_INFO, LOG_NOTICE, LOG_WARNING };
const char *c = ".-*#";
FILE *fp;
char buf[64];
int rawmode = (level & LL_RAW);
int log_to_stdout = server.logfile[0] == '\0';
level &= 0xff; /* clear flags */
if (level < server.verbosity) return;
fp = log_to_stdout ? stdout : fopen(server.logfile,"a");
if (!fp) return;
if (rawmode) {
fprintf(fp,"%s",msg);
} else {
int off;
struct timeval tv;
int role_char;
pid_t pid = getpid();
gettimeofday(&tv,NULL);
struct tm tm;
nolocks_localtime(&tm,tv.tv_sec,server.timezone,server.daylight_active);
off = strftime(buf,sizeof(buf),"%d %b %Y %H:%M:%S.",&tm);
snprintf(buf+off,sizeof(buf)-off,"%03d",(int)tv.tv_usec/1000);
if (server.sentinel_mode) {
role_char = 'X'; /* Sentinel. */
} else if (pid != server.pid) {
role_char = 'C'; /* RDB / AOF writing child. */
} else {
role_char = (server.masterhost ? 'S':'M'); /* Slave or Master. */
}
fprintf(fp,"%d:%c %s %c %s\n",
(int)getpid(),role_char, buf,c[level],msg);
}
fflush(fp);
if (!log_to_stdout) fclose(fp);
if (server.syslog_enabled) syslog(syslogLevelMap[level], "%s", msg);
}
/* Like serverLogRaw() but with printf-alike support. This is the function that
* is used across the code. The raw version is only used in order to dump
* the INFO output on crash. */
void serverLog(int level, const char *fmt, ...) {
va_list ap;
char msg[LOG_MAX_LEN];
if ((level&0xff) < server.verbosity) return;
va_start(ap, fmt);
vsnprintf(msg, sizeof(msg), fmt, ap);
va_end(ap);
serverLogRaw(level,msg);
}
/* Log a fixed message without printf-alike capabilities, in a way that is
* safe to call from a signal handler.
*
* We actually use this only for signals that are not fatal from the point
* of view of Redis. Signals that are going to kill the server anyway and
* where we need printf-alike features are served by serverLog(). */
void serverLogFromHandler(int level, const char *msg) {
int fd;
int log_to_stdout = server.logfile[0] == '\0';
char buf[64];
if ((level&0xff) < server.verbosity || (log_to_stdout && server.daemonize))
return;
fd = log_to_stdout ? STDOUT_FILENO :
open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644);
if (fd == -1) return;
ll2string(buf,sizeof(buf),getpid());
if (write(fd,buf,strlen(buf)) == -1) goto err;
if (write(fd,":signal-handler (",17) == -1) goto err;
ll2string(buf,sizeof(buf),time(NULL));
if (write(fd,buf,strlen(buf)) == -1) goto err;
if (write(fd,") ",2) == -1) goto err;
if (write(fd,msg,strlen(msg)) == -1) goto err;
if (write(fd,"\n",1) == -1) goto err;
err:
if (!log_to_stdout) close(fd);
}
/* Return the UNIX time in microseconds */
long long ustime(void) {
struct timeval tv;
long long ust;
gettimeofday(&tv, NULL);
ust = ((long long)tv.tv_sec)*1000000;
ust += tv.tv_usec;
return ust;
}
/* Return the UNIX time in milliseconds */
mstime_t mstime(void) {
return ustime()/1000;
}
/* After an RDB dump or AOF rewrite we exit from children using _exit() instead of
* exit(), because the latter may interact with the same file objects used by
* the parent process. However if we are testing the coverage normal exit() is
* used in order to obtain the right coverage information. */
void exitFromChild(int retcode) {
#ifdef COVERAGE_TEST
exit(retcode);
#else
_exit(retcode);
#endif
}
/*====================== Hash table type implementation ==================== */
/* This is a hash table type that uses the SDS dynamic strings library as
* keys and redis objects as values (objects can hold SDS strings,
* lists, sets). */
void dictVanillaFree(void *privdata, void *val)
{
DICT_NOTUSED(privdata);
zfree(val);
}
void dictListDestructor(void *privdata, void *val)
{
DICT_NOTUSED(privdata);
listRelease((list*)val);
}
int dictSdsKeyCompare(void *privdata, const void *key1,
const void *key2)
{
int l1,l2;
DICT_NOTUSED(privdata);
l1 = sdslen((sds)key1);
l2 = sdslen((sds)key2);
if (l1 != l2) return 0;
return memcmp(key1, key2, l1) == 0;
}
/* A case insensitive version used for the command lookup table and other
* places where case insensitive non binary-safe comparison is needed. */
int dictSdsKeyCaseCompare(void *privdata, const void *key1,
const void *key2)
{
DICT_NOTUSED(privdata);
return strcasecmp(key1, key2) == 0;
}
void dictObjectDestructor(void *privdata, void *val)
{
DICT_NOTUSED(privdata);
if (val == NULL) return; /* Lazy freeing will set value to NULL. */
decrRefCount(val);
}
void dictSdsDestructor(void *privdata, void *val)
{
DICT_NOTUSED(privdata);
sdsfree(val);
}
int dictObjKeyCompare(void *privdata, const void *key1,
const void *key2)
{
const robj *o1 = key1, *o2 = key2;
return dictSdsKeyCompare(privdata,o1->ptr,o2->ptr);
}
uint64_t dictObjHash(const void *key) {
const robj *o = key;
return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
}
uint64_t dictSdsHash(const void *key) {
return dictGenHashFunction((unsigned char*)key, sdslen((char*)key));
}
uint64_t dictSdsCaseHash(const void *key) {
return dictGenCaseHashFunction((unsigned char*)key, sdslen((char*)key));
}
int dictEncObjKeyCompare(void *privdata, const void *key1,
const void *key2)
{
robj *o1 = (robj*) key1, *o2 = (robj*) key2;
int cmp;
if (o1->encoding == OBJ_ENCODING_INT &&
o2->encoding == OBJ_ENCODING_INT)
return o1->ptr == o2->ptr;
o1 = getDecodedObject(o1);
o2 = getDecodedObject(o2);
cmp = dictSdsKeyCompare(privdata,o1->ptr,o2->ptr);
decrRefCount(o1);
decrRefCount(o2);
return cmp;
}
uint64_t dictEncObjHash(const void *key) {
robj *o = (robj*) key;
if (sdsEncodedObject(o)) {
return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
} else {
if (o->encoding == OBJ_ENCODING_INT) {
char buf[32];
int len;
len = ll2string(buf,32,(long)o->ptr);
return dictGenHashFunction((unsigned char*)buf, len);
} else {
uint64_t hash;
o = getDecodedObject(o);
hash = dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
decrRefCount(o);
return hash;
}
}
}
/* Generic hash table type where keys are Redis Objects, Values
* dummy pointers. */
dictType objectKeyPointerValueDictType = {
dictEncObjHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictEncObjKeyCompare, /* key compare */
dictObjectDestructor, /* key destructor */
NULL /* val destructor */
};
/* Like objectKeyPointerValueDictType(), but values can be destroyed, if
* not NULL, calling zfree(). */
dictType objectKeyHeapPointerValueDictType = {
dictEncObjHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictEncObjKeyCompare, /* key compare */
dictObjectDestructor, /* key destructor */
dictVanillaFree /* val destructor */
};
/* Set dictionary type. Keys are SDS strings, values are ot used. */
dictType setDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Sorted sets hash (note: a skiplist is used in addition to the hash table) */
dictType zsetDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
NULL, /* Note: SDS string shared & freed by skiplist */
NULL /* val destructor */
};
/* Db->dict, keys are sds strings, vals are Redis objects. */
dictType dbDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictSdsDestructor, /* key destructor */
dictObjectDestructor /* val destructor */
};
/* server.lua_scripts sha (as sds string) -> scripts (as robj) cache. */
dictType shaScriptObjectDictType = {
dictSdsCaseHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCaseCompare, /* key compare */
dictSdsDestructor, /* key destructor */
dictObjectDestructor /* val destructor */
};
/* Db->expires */
dictType keyptrDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
NULL, /* key destructor */
NULL /* val destructor */
};
/* Command table. sds string -> command struct pointer. */
dictType commandTableDictType = {
dictSdsCaseHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCaseCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Hash type hash table (note that small hashes are represented with ziplists) */
dictType hashDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictSdsDestructor, /* key destructor */
dictSdsDestructor /* val destructor */
};
/* Keylist hash table type has unencoded redis objects as keys and
* lists as values. It's used for blocking operations (BLPOP) and to
* map swapped keys to a list of clients waiting for this keys to be loaded. */
dictType keylistDictType = {
dictObjHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictObjKeyCompare, /* key compare */
dictObjectDestructor, /* key destructor */
dictListDestructor /* val destructor */
};
/* Cluster nodes hash table, mapping nodes addresses 1.2.3.4:6379 to
* clusterNode structures. */
dictType clusterNodesDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Cluster re-addition blacklist. This maps node IDs to the time
* we can re-add this node. The goal is to avoid readding a removed
* node for some time. */
dictType clusterNodesBlackListDictType = {
dictSdsCaseHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCaseCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Cluster re-addition blacklist. This maps node IDs to the time
* we can re-add this node. The goal is to avoid readding a removed
* node for some time. */
dictType modulesDictType = {
dictSdsCaseHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCaseCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Migrate cache dict type. */
dictType migrateCacheDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
/* Replication cached script dict (server.repl_scriptcache_dict).
* Keys are sds SHA1 strings, while values are not used at all in the current
* implementation. */
dictType replScriptCacheDictType = {
dictSdsCaseHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCaseCompare, /* key compare */
dictSdsDestructor, /* key destructor */
NULL /* val destructor */
};
int htNeedsResize(dict *dict) {
long long size, used;
size = dictSlots(dict);
used = dictSize(dict);
return (size > DICT_HT_INITIAL_SIZE &&
(used*100/size < HASHTABLE_MIN_FILL));
}
/* If the percentage of used slots in the HT reaches HASHTABLE_MIN_FILL
* we resize the hash table to save memory */
void tryResizeHashTables(int dbid) {
if (htNeedsResize(server.db[dbid].dict))
dictResize(server.db[dbid].dict);
if (htNeedsResize(server.db[dbid].expires))
dictResize(server.db[dbid].expires);
}
/* Our hash table implementation performs rehashing incrementally while
* we write/read from the hash table. Still if the server is idle, the hash
* table will use two tables for a long time. So we try to use 1 millisecond
* of CPU time at every call of this function to perform some rehahsing.
*
* The function returns 1 if some rehashing was performed, otherwise 0
* is returned. */
int incrementallyRehash(int dbid) {
/* Keys dictionary */
if (dictIsRehashing(server.db[dbid].dict)) {
dictRehashMilliseconds(server.db[dbid].dict,1);
return 1; /* already used our millisecond for this loop... */
}
/* Expires */
if (dictIsRehashing(server.db[dbid].expires)) {
dictRehashMilliseconds(server.db[dbid].expires,1);
return 1; /* already used our millisecond for this loop... */
}
return 0;
}
/* This function is called once a background process of some kind terminates,
* as we want to avoid resizing the hash tables when there is a child in order
* to play well with copy-on-write (otherwise when a resize happens lots of
* memory pages are copied). The goal of this function is to update the ability
* for dict.c to resize the hash tables accordingly to the fact we have o not
* running childs. */
void updateDictResizePolicy(void) {
if (server.rdb_child_pid == -1 && server.aof_child_pid == -1)
dictEnableResize();
else
dictDisableResize();
}
int hasActiveChildProcess() {
return server.rdb_child_pid != -1 ||
server.aof_child_pid != -1;
}
/* ======================= Cron: called every 100 ms ======================== */
/* Add a sample to the operations per second array of samples. */
void trackInstantaneousMetric(int metric, long long current_reading) {
long long t = mstime() - server.inst_metric[metric].last_sample_time;
long long ops = current_reading -
server.inst_metric[metric].last_sample_count;
long long ops_sec;
ops_sec = t > 0 ? (ops*1000/t) : 0;
server.inst_metric[metric].samples[server.inst_metric[metric].idx] =
ops_sec;
server.inst_metric[metric].idx++;
server.inst_metric[metric].idx %= STATS_METRIC_SAMPLES;
server.inst_metric[metric].last_sample_time = mstime();
server.inst_metric[metric].last_sample_count = current_reading;
}
/* Return the mean of all the samples. */
long long getInstantaneousMetric(int metric) {
int j;
long long sum = 0;
for (j = 0; j < STATS_METRIC_SAMPLES; j++)
sum += server.inst_metric[metric].samples[j];
return sum / STATS_METRIC_SAMPLES;
}
/* Check for timeouts. Returns non-zero if the client was terminated.
* The function gets the current time in milliseconds as argument since
* it gets called multiple times in a loop, so calling gettimeofday() for
* each iteration would be costly without any actual gain. */
int clientsCronHandleTimeout(client *c, mstime_t now_ms) {
time_t now = now_ms/1000;
if (server.maxidletime &&
!(c->flags & CLIENT_SLAVE) && /* no timeout for slaves */
!(c->flags & CLIENT_MASTER) && /* no timeout for masters */
!(c->flags & CLIENT_BLOCKED) && /* no timeout for BLPOP */
!(c->flags & CLIENT_PUBSUB) && /* no timeout for Pub/Sub clients */
(now - c->lastinteraction > server.maxidletime))
{
serverLog(LL_VERBOSE,"Closing idle client");
freeClient(c);
return 1;
} else if (c->flags & CLIENT_BLOCKED) {
/* Blocked OPS timeout is handled with milliseconds resolution.
* However note that the actual resolution is limited by
* server.hz. */
if (c->bpop.timeout != 0 && c->bpop.timeout < now_ms) {
/* Handle blocking operation specific timeout. */
replyToBlockedClientTimedOut(c);
unblockClient(c);
} else if (server.cluster_enabled) {
/* Cluster: handle unblock & redirect of clients blocked
* into keys no longer served by this server. */
if (clusterRedirectBlockedClientIfNeeded(c))
unblockClient(c);
}
}
return 0;
}
/* The client query buffer is an sds.c string that can end with a lot of
* free space not used, this function reclaims space if needed.
*
* The function always returns 0 as it never terminates the client. */
int clientsCronResizeQueryBuffer(client *c) {
size_t querybuf_size = sdsAllocSize(c->querybuf);
time_t idletime = server.unixtime - c->lastinteraction;
/* There are two conditions to resize the query buffer:
* 1) Query buffer is > BIG_ARG and too big for latest peak.
* 2) Query buffer is > BIG_ARG and client is idle. */
if (querybuf_size > PROTO_MBULK_BIG_ARG &&
((querybuf_size/(c->querybuf_peak+1)) > 2 ||
idletime > 2))
{
/* Only resize the query buffer if it is actually wasting
* at least a few kbytes. */
if (sdsavail(c->querybuf) > 1024*4) {
c->querybuf = sdsRemoveFreeSpace(c->querybuf);
}
}
/* Reset the peak again to capture the peak memory usage in the next
* cycle. */
c->querybuf_peak = 0;
/* Clients representing masters also use a "pending query buffer" that
* is the yet not applied part of the stream we are reading. Such buffer
* also needs resizing from time to time, otherwise after a very large
* transfer (a huge value or a big MIGRATE operation) it will keep using
* a lot of memory. */
if (c->flags & CLIENT_MASTER) {
/* There are two conditions to resize the pending query buffer:
* 1) Pending Query buffer is > LIMIT_PENDING_QUERYBUF.
* 2) Used length is smaller than pending_querybuf_size/2 */
size_t pending_querybuf_size = sdsAllocSize(c->pending_querybuf);
if(pending_querybuf_size > LIMIT_PENDING_QUERYBUF &&
sdslen(c->pending_querybuf) < (pending_querybuf_size/2))
{
c->pending_querybuf = sdsRemoveFreeSpace(c->pending_querybuf);
}
}
return 0;
}
/* This function is used in order to track clients using the biggest amount
* of memory in the latest few seconds. This way we can provide such information
* in the INFO output (clients section), without having to do an O(N) scan for
* all the clients.
*
* This is how it works. We have an array of CLIENTS_PEAK_MEM_USAGE_SLOTS slots
* where we track, for each, the biggest client output and input buffers we
* saw in that slot. Every slot correspond to one of the latest seconds, since
* the array is indexed by doing UNIXTIME % CLIENTS_PEAK_MEM_USAGE_SLOTS.
*
* When we want to know what was recently the peak memory usage, we just scan
* such few slots searching for the maximum value. */
#define CLIENTS_PEAK_MEM_USAGE_SLOTS 8
size_t ClientsPeakMemInput[CLIENTS_PEAK_MEM_USAGE_SLOTS];
size_t ClientsPeakMemOutput[CLIENTS_PEAK_MEM_USAGE_SLOTS];
int clientsCronTrackExpansiveClients(client *c) {
size_t in_usage = sdsAllocSize(c->querybuf);
size_t out_usage = getClientOutputBufferMemoryUsage(c);
int i = server.unixtime % CLIENTS_PEAK_MEM_USAGE_SLOTS;
int zeroidx = (i+1) % CLIENTS_PEAK_MEM_USAGE_SLOTS;
/* Always zero the next sample, so that when we switch to that second, we'll
* only register samples that are greater in that second without considering
* the history of such slot.
*
* Note: our index may jump to any random position if serverCron() is not
* called for some reason with the normal frequency, for instance because
* some slow command is called taking multiple seconds to execute. In that
* case our array may end containing data which is potentially older
* than CLIENTS_PEAK_MEM_USAGE_SLOTS seconds: however this is not a problem
* since here we want just to track if "recently" there were very expansive
* clients from the POV of memory usage. */
ClientsPeakMemInput[zeroidx] = 0;
ClientsPeakMemOutput[zeroidx] = 0;
/* Track the biggest values observed so far in this slot. */
if (in_usage > ClientsPeakMemInput[i]) ClientsPeakMemInput[i] = in_usage;
if (out_usage > ClientsPeakMemOutput[i]) ClientsPeakMemOutput[i] = out_usage;
return 0; /* This function never terminates the client. */
}
/* Return the max samples in the memory usage of clients tracked by
* the function clientsCronTrackExpansiveClients(). */
void getExpansiveClientsInfo(size_t *in_usage, size_t *out_usage) {
size_t i = 0, o = 0;
for (int j = 0; j < CLIENTS_PEAK_MEM_USAGE_SLOTS; j++) {
if (ClientsPeakMemInput[j] > i) i = ClientsPeakMemInput[j];
if (ClientsPeakMemOutput[j] > o) o = ClientsPeakMemOutput[j];
}
*in_usage = i;
*out_usage = o;
}
/* This function is called by serverCron() and is used in order to perform
* operations on clients that are important to perform constantly. For instance
* we use this function in order to disconnect clients after a timeout, including
* clients blocked in some blocking command with a non-zero timeout.
*
* The function makes some effort to process all the clients every second, even
* if this cannot be strictly guaranteed, since serverCron() may be called with
* an actual frequency lower than server.hz in case of latency events like slow
* commands.
*
* It is very important for this function, and the functions it calls, to be
* very fast: sometimes Redis has tens of hundreds of connected clients, and the
* default server.hz value is 10, so sometimes here we need to process thousands
* of clients per second, turning this function into a source of latency.
*/
#define CLIENTS_CRON_MIN_ITERATIONS 5
void clientsCron(void) {
/* Try to process at least numclients/server.hz of clients
* per call. Since normally (if there are no big latency events) this
* function is called server.hz times per second, in the average case we
* process all the clients in 1 second. */
int numclients = listLength(server.clients);
int iterations = numclients/server.hz;
mstime_t now = mstime();
/* Process at least a few clients while we are at it, even if we need
* to process less than CLIENTS_CRON_MIN_ITERATIONS to meet our contract
* of processing each client once per second. */
if (iterations < CLIENTS_CRON_MIN_ITERATIONS)
iterations = (numclients < CLIENTS_CRON_MIN_ITERATIONS) ?
numclients : CLIENTS_CRON_MIN_ITERATIONS;
while(listLength(server.clients) && iterations--) {
client *c;
listNode *head;
/* Rotate the list, take the current head, process.
* This way if the client must be removed from the list it's the
* first element and we don't incur into O(N) computation. */
listRotate(server.clients);
head = listFirst(server.clients);
c = listNodeValue(head);
/* The following functions do different service checks on the client.
* The protocol is that they return non-zero if the client was
* terminated. */
if (clientsCronHandleTimeout(c,now)) continue;
if (clientsCronResizeQueryBuffer(c)) continue;
if (clientsCronTrackExpansiveClients(c)) continue;
}
}