【redis6.0.6】redis源码慢慢学,慢慢看 -- 第四天:提纲掣领main函数(server)
【摘要】
文章目录
前言:
Redis MakefileCopyright (C) 2009 Salvatore Sanfilippo This file is released under the BSD license, see the COPYING file探索main函数第一块第二块第三块第四块第五块 第六块第七块
前言:
先附上人家的...
前言:
先附上人家的版权:
Redis Makefile
Copyright © 2009 Salvatore Sanfilippo
This file is released under the BSD license, see the COPYING file
redis和STL不同,这是一个完整项目,有头有尾,STL是一套组件,开箱即用。而阅读一个项目的源码,是不是应该从main函数入手,尽管大部分函数不知道怎么实现的,那又如何?字面意思不是很明显嘛,高内聚。
所以我决定,从main入手,全面铺开。
探索main函数
函数全貌我就不放出来了,太大块
一块一块来。
第一块
#ifdef REDIS_TEST if (argc == 3 && !strcasecmp(argv[1], "test")) { if (!strcasecmp(argv[2], "ziplist")) { return ziplistTest(argc, argv); } else if (!strcasecmp(argv[2], "quicklist")) { quicklistTest(argc, argv); } else if (!strcasecmp(argv[2], "intset")) { return intsetTest(argc, argv); } else if (!strcasecmp(argv[2], "zipmap")) { return zipmapTest(argc, argv); } else if (!strcasecmp(argv[2], "sha1test")) { return sha1Test(argc, argv); } else if (!strcasecmp(argv[2], "util")) { return utilTest(argc, argv); } else if (!strcasecmp(argv[2], "endianconv")) { return endianconvTest(argc, argv); } else if (!strcasecmp(argv[2], "crc64")) { return crc64Test(argc, argv); } else if (!strcasecmp(argv[2], "zmalloc")) { return zmalloc_test(argc, argv); } return -1; /* test not found */ }
#endif
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明眼人都知道它是干嘛用的吧,我就不多说啦。
第二块
#ifdef INIT_SETPROCTITLE_REPLACEMENT spt_init(argc, argv);
#endif
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初始化库
第三块
setlocale(LC_COLLATE,""); //更改字符编码 tzset(); /* Populates 'timezone' global. */ zmalloc_set_oom_handler(redisOutOfMemoryHandler); //oom时的处理,主要是内存不足时,将需要的memory的值打印出来 srand(time(NULL)^getpid()); // 根据当前时间和pid获取随机值的 gettimeofday(&tv,NULL); // 1970年1月1日到现在的时间 crc64_init();
//哈希种子
uint8_t hashseed[16]; getRandomBytes(hashseed,sizeof(hashseed)); dictSetHashFunctionSeed(hashseed); // 检查服务器是否以 Sentinel 模式启动 server.sentinel_mode = checkForSentinelMode(argc,argv);
// 初始化服务器 initServerConfig(); ACLInit(); /* The ACL subsystem must be initialized ASAP because the basic networking code and client creation depends on it. */ moduleInitModulesSystem(); tlsInit();
/* Store the executable path and arguments in a safe place in order * to be able to restart the server later. */ server.executable = getAbsolutePath(argv[0]); server.exec_argv = zmalloc(sizeof(char*)*(argc+1)); server.exec_argv[argc] = NULL; for (j = 0; j < argc; j++) server.exec_argv[j] = zstrdup(argv[j]);
// 如果服务器以 Sentinel 模式启动,那么进行 Sentinel 功能相关的初始化 // 并为要监视的主服务器创建一些相应的数据结构 if (server.sentinel_mode) { initSentinelConfig(); initSentinel(); }
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诸位都亲眼目睹咯,一堆的初始化工作。
第四块
检查是否要以redis-check-rdb/aof方式启动
if (strstr(argv[0],"redis-check-rdb") != NULL) redis_check_rdb_main(argc,argv,NULL); else if (strstr(argv[0],"redis-check-aof") != NULL) redis_check_aof_main(argc,argv); //检查用户是否指定了配置文件,或者配置选项
if (argc >= 2) { j = 1; /* First option to parse in argv[] */ sds options = sdsempty(); char *configfile = NULL;
//处理特殊选项 -h 、-v 和 --test-memory /* Handle special options --help and --version */ if (strcmp(argv[1], "-v") == 0 || strcmp(argv[1], "--version") == 0) version(); if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) usage(); if (strcmp(argv[1], "--test-memory") == 0) { if (argc == 3) { memtest(atoi(argv[2]),50); exit(0); } else { fprintf(stderr,"Please specify the amount of memory to test in megabytes.\n"); fprintf(stderr,"Example: ./redis-server --test-memory 4096\n\n"); exit(1); } }
// 如果第一个参数(argv[1])不是以 "--" 开头,那么它应该是一个配置文件 if (argv[j][0] != '-' || argv[j][1] != '-') { configfile = argv[j]; server.configfile = getAbsolutePath(configfile); /* Replace the config file in server.exec_argv with * its absolute path. */ zfree(server.exec_argv[j]); server.exec_argv[j] = zstrdup(server.configfile); j++; } // 对用户给定的其余选项进行分析,并将分析所得的字符串追加稍后载入的配置文件的内容之后
// 比如 --port 6380 会被分析为 "port 6380\n"
while(j != argc) { if (argv[j][0] == '-' && argv[j][1] == '-') { /* Option name */ if (!strcmp(argv[j], "--check-rdb")) { /* Argument has no options, need to skip for parsing. */ j++; continue; } if (sdslen(options)) options = sdscat(options,"\n"); options = sdscat(options,argv[j]+2); options = sdscat(options," "); } else { /* Option argument */ options = sdscatrepr(options,argv[j],strlen(argv[j])); options = sdscat(options," "); } j++; } if (server.sentinel_mode && configfile && *configfile == '-') { serverLog(LL_WARNING, "Sentinel config from STDIN not allowed."); serverLog(LL_WARNING, "Sentinel needs config file on disk to save state. Exiting..."); exit(1); } resetServerSaveParams(); // 重置保存条件 loadServerConfig(configfile,options); // 载入配置文件, options 是前面分析出的给定选项 sdsfree(options); }
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可以看出,是一些开机自选项的配置
第五块
serverLog(LL_WARNING, "oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo"); serverLog(LL_WARNING, "Redis version=%s, bits=%d, commit=%s, modified=%d, pid=%d, just started", REDIS_VERSION, (sizeof(long) == 8) ? 64 : 32, redisGitSHA1(), strtol(redisGitDirty(),NULL,10) > 0, (int)getpid()); if (argc == 1) { serverLog(LL_WARNING, "Warning: no config file specified, using the default config. In order to specify a config file use %s /path/to/%s.conf", argv[0], server.sentinel_mode ? "sentinel" : "redis"); } else { serverLog(LL_WARNING, "Configuration loaded"); } server.supervised = redisIsSupervised(server.supervised_mode); int background = server.daemonize && !server.supervised; if (background) daemonize();
server.supervised = redisIsSupervised(server.supervised_mode); int background = server.daemonize && !server.supervised; if (background) daemonize(); //sever端的初始化 initServer(); // 设置进程的title if (background || server.pidfile) createPidFile(); redisSetProcTitle(argv[0]); redisAsciiArt(); checkTcpBacklogSettings();
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第六块
// 如果服务器不是运行在 SENTINEL 模式,那么执行以下代码
if (!server.sentinel_mode) { /* Things not needed when running in Sentinel mode. */ serverLog(LL_WARNING,"Server initialized"); #ifdef __linux__ linuxMemoryWarnings(); // 打印内存警告 #endif moduleLoadFromQueue(); ACLLoadUsersAtStartup(); InitServerLast(); loadDataFromDisk(); // 从 AOF 文件或者 RDB 文件中载入数据 if (server.cluster_enabled) { // 启动集群? if (verifyClusterConfigWithData() == C_ERR) { serverLog(LL_WARNING, "You can't have keys in a DB different than DB 0 when in " "Cluster mode. Exiting."); exit(1); } } if (server.ipfd_count > 0 || server.tlsfd_count > 0) serverLog(LL_NOTICE,"Ready to accept connections"); if (server.sofd > 0) serverLog(LL_NOTICE,"The server is now ready to accept connections at %s", server.unixsocket); if (server.supervised_mode == SUPERVISED_SYSTEMD) { if (!server.masterhost) { redisCommunicateSystemd("STATUS=Ready to accept connections\n"); redisCommunicateSystemd("READY=1\n"); } else { redisCommunicateSystemd("STATUS=Waiting for MASTER <-> REPLICA sync\n"); } } } else { InitServerLast(); sentinelIsRunning(); // 检测sentinel的配置是否有效 if (server.supervised_mode == SUPERVISED_SYSTEMD) { redisCommunicateSystemd("STATUS=Ready to accept connections\n"); redisCommunicateSystemd("READY=1\n"); } }
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第七块
// 检查不正常的 maxmemory 配置 if (server.maxmemory > 0 && server.maxmemory < 1024*1024) { serverLog(LL_WARNING,"WARNING: You specified a maxmemory value that is less than 1MB (current value is %llu bytes). Are you sure this is what you really want?", server.maxmemory); }
// 运行事件处理器,一直到服务器关闭为止 redisSetCpuAffinity(server.server_cpulist); aeMain(server.el); aeDeleteEventLoop(server.el); // 服务器关闭,停止事件循环 return 0;
}
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喔,累,这两天忙着回学校加复习,两天没更了。
如果觉得还阔以,阔以来个赞评关注哦!
文章来源: lion-wu.blog.csdn.net,作者:看,未来,版权归原作者所有,如需转载,请联系作者。
原文链接:lion-wu.blog.csdn.net/article/details/108327262
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