{"id":201164,"date":"2025-05-10T08:01:06","date_gmt":"2025-05-10T00:01:06","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201164\/"},"modified":"2025-05-10T08:01:06","modified_gmt":"2025-05-10T00:01:06","slug":"redis%e5%91%bd%e4%bb%a4%e5%a4%84%e7%90%86%e8%bf%87%e7%a8%8b%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201164\/","title":{"rendered":"Redis\u547d\u4ee4\u5904\u7406\u8fc7\u7a0b\u6e90\u7801\u89e3\u6790"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u547d\u4ee4\u5904\u7406\u8fc7\u7a0b\u6e90\u7801\u89e3\u6790<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300aRedis\u547d\u4ee4\u5904\u7406\u8fc7\u7a0b\u6e90\u7801\u89e3\u6790\u300b\uff0c\u4e3b\u8981\u5305\u62ecRedis\u547d\u4ee4\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n

\u672c\u6587\u57fa\u4e8e\u793e\u533a\u7248Redis 4.0.8<\/p>\n

<\/p>\n

1\u3001\u547d\u4ee4\u89e3\u6790<\/h2>\n

Redis\u670d\u52a1\u5668\u63a5\u6536\u5230\u7684\u547d\u4ee4\u8bf7\u6c42\u9996\u5148\u5b58\u50a8\u5728\u5ba2\u6237\u7aef\u5bf9\u8c61\u7684querybuf\u8f93\u5165\u7f13\u51b2\u533a\uff0c\u7136\u540e\u89e3\u6790\u547d\u4ee4\u8bf7\u6c42\u7684\u5404\u4e2a\u53c2\u6570\uff0c\u5e76\u5b58\u50a8\u5728\u5ba2\u6237\u7aef\u5bf9\u8c61\u7684argv\u548cargc\u5b57\u6bb5\u3002<\/p>\n

\u5ba2\u6237\u7aef\u89e3\u6790\u547d\u4ee4\u8bf7\u6c42\u7684\u5165\u53e3\u51fd\u6570\u4e3areadQueryFromClient\uff0c\u4f1a\u8bfb\u53d6socket\u6570\u636e\u5b58\u50a8\u5230\u5ba2\u6237\u7aef\u5bf9\u8c61\u7684\u8f93\u5165\u7f13\u51b2\u533a\uff0c\u5e76\u8c03\u7528\u51fd\u6570processInputBuffer\u89e3\u6790\u547d\u4ee4\u8bf7\u6c42\u3002<\/p>\n

\u6ce8\uff1a\u5185\u8054\u547d\u4ee4\uff1a\u4f7f\u7528telnet\u4f1a\u8bdd\u8f93\u5165\u547d\u4ee4\u7684\u65b9\u5f0f<\/p>\n

void processInputBuffer(client *c) {\n    ......\n    \/\/\u5faa\u73af\u904d\u5386\u8f93\u5165\u7f13\u51b2\u533a\uff0c\u83b7\u53d6\u547d\u4ee4\u53c2\u6570,\u8c03\u7528processMultibulkBuffer\u89e3\u6790\u547d\u4ee4\u53c2\u6570\u548c\u957f\u5ea6\n    while(sdslen(c->querybuf)) {\n        if (c->reqtype == PROTO_REQ_INLINE) {\n            if (processInlineBuffer(c) != C_OK) break;\/\/\u5904\u7406telnet\u65b9\u5f0f\u7684\u5185\u8054\u547d\u4ee4\n        } else if (c->reqtype == PROTO_REQ_MULTIBULK) {\n            if (processMultibulkBuffer(c) != C_OK) break; \/\/\u89e3\u6790\u547d\u4ee4\u53c2\u6570\u548c\u957f\u5ea6\u6682\u5b58\u5230\u5ba2\u6237\u7aef\u7ed3\u6784\u4f53\u4e2d\n        } else {\n            serverPanic(\"Unknown request type\");\n        }\n    }    \n}\n\n\/\/\u89e3\u6790\u547d\u4ee4\u53c2\u6570\u548c\u957f\u5ea6\u6682\u5b58\u5230\u5ba2\u6237\u7aef\u7ed3\u6784\u4f53\u4e2d\nint processMultibulkBuffer(client *c) {\n    \/\/\u5b9a\u4f4d\u5230\u884c\u5c3e\n    newline = strchr(c->querybuf,'\\r');\n    \/\/\u89e3\u6790\u547d\u4ee4\u8bf7\u6c42\u53c2\u6570\u6570\u76ee\uff0c\u5e76\u5b58\u50a8\u5728\u5ba2\u6237\u7aef\u5bf9\u8c61\u7684c->multibulklen\u5b57\u6bb5\n    serverAssertWithInfo(c,NULL,c->querybuf[0] == '*');\n    ok = string2ll(c->querybuf+1,newline-(c->querybuf+1),&ll);\n    c->multibulklen = ll;\n    pos = (newline-c->querybuf)+2;\/\/\u8bb0\u5f55\u5df2\u89e3\u6790\u547d\u4ee4\u7684\u8bf7\u6c42\u957f\u5ea6resp\u7684\u957f\u5ea6\n    \/* Setup argv array on client structure *\/\n    \/\/\u5206\u914d\u8bf7\u6c42\u53c2\u6570\u5b58\u50a8\u7a7a\u95f4\n    c->argv = zmalloc(sizeof(robj*)*c->multibulklen);\n    \n    \/\/ \u5f00\u59cb\u5faa\u73af\u89e3\u6790\u6bcf\u4e2a\u8bf7\u6c42\u53c2\u6570\n    while(c->multibulklen) {\n        ......\n        newline = strchr(c->querybuf+pos,'\\r');\n        if (c->querybuf[pos] != '$') {\n            return C_ERR;\n        ok = string2ll(c->querybuf+pos+1,newline-(c->querybuf+pos+1),&ll);\n        pos += newline-(c->querybuf+pos)+2;\n        c->bulklen = ll;\/\/\u5b57\u7b26\u4e32\u53c2\u6570\u957f\u5ea6\u6682\u5b58\u5728\u5ba2\u6237\u7aef\u5bf9\u8c61\u7684bulklen\u5b57\u6bb5\n        \n        \/\/\u8bfb\u53d6\u8be5\u957f\u5ea6\u7684\u53c2\u6570\u5185\u5bb9\uff0c\u5e76\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u540c\u65f6\u66f4\u65b0\u5f85\u89e3\u6790\u53c2\u6570multibulklen\n        c->argv[c->argc++] =createStringObject(c->querybuf+pos,c->bulklen);\n        pos += c->bulklen+2;\n        c->multibulklen--;\n    }<\/pre>\n
2\u3001\u547d\u4ee4\u8c03\u7528<\/h2>\n
\u5f53multibulklen\u7684\u503c\u66f4\u65b0\u4e3a0\u65f6\uff0c\u8868\u793a\u53c2\u6570\u89e3\u6790\u5b8c\u6210\uff0c\u5f00\u59cb\u8c03\u7528processCommand\u6765\u5904\u7406\u547d\u4ee4\uff0c\u5904\u7406\u547d\u4ee4\u524d\u6709\u5f88\u591a\u6821\u9a8c\u903b\u8f91\uff0c\u5982\u4e0b\uff1a<\/p>\n
void processInputBuffer(client *c) {\n    \n    ......\n     \/\/\u8c03\u7528processCommand\u6765\u5904\u7406\u547d\u4ee4\n     if (processCommand(c) == C_OK) {\n         ......\n     }\n}\n\n\/\/\u5904\u7406\u547d\u4ee4\u51fd\u6570\nint processCommand(client *c) {\n    \/\/\u6821\u9a8c\u662f\u5426\u662fquit\u547d\u4ee4\n    if (!strcasecmp(c->argv[0]->ptr,\"quit\")) {\n        addReply(c,shared.ok);\n        c->flags |= CLIENT_CLOSE_AFTER_REPLY;\n        return C_ERR;\n    }\n    \/\/\u8c03\u7528lookupCommand\uff0c\u67e5\u770b\u8be5\u547d\u4ee4\u662f\u5426\u5b58\u5728\n    c->cmd = c->lastcmd = lookupCommand(c->argv[0]->ptr);\n    if (!c->cmd) {\n        flagTransaction(c);\n        addReplyErrorFormat(c,\"unknown command '%s'\",\n            (char*)c->argv[0]->ptr);\n        return C_OK;\n    \/\/\u68c0\u67e5\u7528\u6237\u6743\u9650\n    if (server.requirepass && !c->authenticated && c->cmd->proc != authCommand)\n    {\n        addReply(c,shared.noautherr);\n    \/\/\u8fd8\u6709\u5f88\u591a\u68c0\u67e5\uff0c\u4e0d\u4e00\u4e00\u5217\u4e3e\uff0c\u6bd4\u5982\u96c6\u7fa4\/\u6301\u4e45\u5316\/\u590d\u5236\u7b49\n    \/* \u771f\u6b63\u6267\u884c\u547d\u4ee4 *\/\n    if (c->flags & CLIENT_MULTI &&\n        c->cmd->proc != execCommand && c->cmd->proc != discardCommand &&\n        c->cmd->proc != multiCommand && c->cmd->proc != watchCommand)\n        queueMultiCommand(c);\n        \/\/\u5c06\u7ed3\u679c\u5199\u5165outbuffer\n        addReply(c,shared.queued);\n    } \n\/\/ \u8c03\u7528execCommand\u6267\u884c\u547d\u4ee4\nvoid execCommand(client *c) {\n    call(c,CMD_CALL_FULL);\/\/\u8c03\u7528call\u6267\u884c\u547d\u4ee4\n\/\/\u8c03\u7528execCommand\u8c03\u7528call\u6267\u884c\u547d\u4ee4\nvoid call(client *c, int flags) {\n    start = ustime();\n    c->cmd->proc(c);\/\/\u6267\u884c\u547d\u4ee4\n    duration = ustime()-start;\n    \/\/\u5982\u679c\u662f\u6162\u67e5\u8be2\uff0c\u8bb0\u5f55\u6162\u67e5\u8be2\n    if (flags & CMD_CALL_SLOWLOG && c->cmd->proc != execCommand) {\n        char *latency_event = (c->cmd->flags & CMD_FAST) ?\n                              \"fast-command\" : \"command\";\n        latencyAddSampleIfNeeded(latency_event,duration\/1000);\n        \/\/\u8bb0\u5f55\u5230\u6162\u65e5\u5fd7\u4e2d\n        slowlogPushEntryIfNeeded(c,c->argv,c->argc,duration);\n    \/\/\u66f4\u65b0\u7edf\u8ba1\u4fe1\u606f\uff1a\u5f53\u524d\u547d\u4ee4\u6267\u884c\u65f6\u95f4\u548c\u8c03\u7528\u6b21\u6570\n    if (flags & CMD_CALL_STATS) {\n        c->lastcmd->microseconds += duration;\n        c->lastcmd->calls++;<\/pre>\n
3\u3001\u8fd4\u56de\u7ed3\u679c<\/h2>\n
Redis\u8fd4\u56de\u7ed3\u679c\u5e76\u4e0d\u662f\u76f4\u63a5\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\uff0c\u800c\u662f\u5148\u5199\u5165\u5230\u8f93\u51fa\u7f13\u51b2\u533a(buf\u5b57\u6bb5)\u6216\u8005\u8f93\u51fa\u94fe\u8868(reply\u5b57\u6bb5)<\/p>\n
int processCommand(client *c) {\n    ......\n    \/\/\u5c06\u7ed3\u679c\u5199\u5165outbuffer\n    addReply(c,shared.queued);\n    ......\n    \n}\n\/\/\u5c06\u7ed3\u679c\u5199\u5165outbuffer\nvoid addReply(client *c, robj *obj) {\n    \/\/\u8c03\u7528listAddNodeHead\u5c06\u5ba2\u6237\u7aef\u6dfb\u52a0\u5230\u670d\u52a1\u7aef\u7ed3\u6784\u4f53\u7684client_pending_write\u94fe\u8868\uff0c\u4ee5\u4fbf\u540e\u7eed\u80fd\u5feb\u901f\u67e5\u627e\u51fa\u54ea\u4e9b\u5ba2\u6237\u7aef\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\n    if (prepareClientToWrite(c) != C_OK) return;\n    \n    \/\/\u7136\u540e\u6dfb\u52a0\u5b57\u7b26\u4e32\u5230\u8f93\u51fa\u7f13\u51b2\u533a\n    if (_addReplyToBuffer(c,obj->ptr,sdslen(obj->ptr)) != C_OK)\n        \/\/\u5982\u679c\u6dfb\u52a0\u5931\u8d25\uff0c\u5219\u6dfb\u52a0\u5230\u8f93\u51fa\u94fe\u8868\u4e2d\n        _addReplyObjectToList(c,obj); \n}<\/pre>\n
addReply\u51fd\u6570\u53ea\u662f\u5c06\u5f85\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u7684\u6570\u636e\u6682\u5b58\u5728\u8f93\u51fa\u94fe\u8868\u6216\u8005\u8f93\u51fa\u7f13\u51b2\u533a\uff0c\u90a3\u4e48\u4ec0\u4e48\u65f6\u5019\u5c06\u8fd9\u4e9b\u6570\u636e\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u5462\uff1f\u7b54\u6848\u662f\u5f00\u542f\u4e8b\u4ef6\u5faa\u73af\u65f6\uff0c\u8c03\u7528\u7684beforesleep\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4e13\u95e8\u6267\u884c\u4e00\u4e9b\u4e0d\u662f\u5f88\u8d39\u65f6\u7684\u64cd\u4f5c\uff0c\u5982\u8fc7\u671f\u952e\u5220\u9664\uff0c\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u547d\u4ee4\u56de\u590d\u7b49<\/p>\n
void beforeSleep(struct aeEventLoop *eventLoop) {\n    ......\n     \/* Handle writes with pending output buffers. *\/\n    handleClientsWithPendingWrites();\n}\n\n\/\/\u56de\u590d\u5ba2\u6237\u7aef\u547d\u4ee4\u51fd\u6570\nint handleClientsWithPendingWrites(void) {\n    listIter li;\n    listNode *ln;\n    int processed = listLength(server.clients_pending_write);\n    listRewind(server.clients_pending_write,&li);\n    while((ln = listNext(&li))) {\n        client *c = listNodeValue(ln);\n        c->flags &= ~CLIENT_PENDING_WRITE;\n        listDelNode(server.clients_pending_write,ln);\n        \/* \u53d1\u9001\u5ba2\u6237\u7aef\u6570\u636e *\/\n        if (writeToClient(c->fd,c,0) == C_ERR) continue;\n        \/* If there is nothing left, do nothing. Otherwise install\n         * the write handler. *\/\n         \/\/\u5982\u679c\u6570\u636e\u91cf\u5f88\u5927\uff0c\u4e00\u6b21\u6027\u6ca1\u6709\u53d1\u9001\u5b8c\u6210\uff0c\u5219\u8fdb\u884c\u6dfb\u52a0\u6587\u4ef6\u4e8b\u4ef6\uff0c\u76d1\u542c\u5f53\u524d\u5ba2\u6237\u7aefsocket\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u53ef\u5199\u4e8b\u4ef6\u5373\u53ef\n        if (clientHasPendingReplies(c) &&\n            aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,\n                sendReplyToClient, c) == AE_ERR)\n        {\n            freeClientAsync(c);\n        }\n    }\n    return processed;<\/pre>\n
\u5230\u8fd9\u91cc\uff0c\u547d\u4ee4\u8bf7\u6c42\u624d\u7b97\u771f\u6b63\u5904\u7406\u5b8c\u6210\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Redis\u547d\u4ee4\u5904\u7406\u8fc7\u7a0b\u6e90\u7801\u89e3\u6790 ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201164","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201164"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201164\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}