{"id":201315,"date":"2025-05-10T09:24:21","date_gmt":"2025-05-10T01:24:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201315\/"},"modified":"2025-05-10T09:24:21","modified_gmt":"2025-05-10T01:24:21","slug":"redis%e6%ba%90%e7%a0%81%e4%b8%8e%e8%ae%be%e8%ae%a1%e5%89%96%e6%9e%90%e4%b9%8b%e7%bd%91%e7%bb%9c%e8%bf%9e%e6%8e%a5%e5%ba%93","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201315\/","title":{"rendered":"Redis\u6e90\u7801\u4e0e\u8bbe\u8ba1\u5256\u6790\u4e4b\u7f51\u7edc\u8fde\u63a5\u5e93"},"content":{"rendered":"

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

Redis\u6e90\u7801\u4e0e\u8bbe\u8ba1\u5256\u6790\u4e4b\u7f51\u7edc\u8fde\u63a5\u5e93<\/h1>\n

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

\u6765\u5230golang\u5b66\u4e60\u7f51\u7684\u5927\u5bb6\uff0c\u76f8\u4fe1\u90fd\u662f\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5e0c\u671b\u5728\u8fd9\u91cc\u5b66\u4e60\u6570\u636e\u5e93\u76f8\u5173\u7f16\u7a0b\u77e5\u8bc6\u3002\u4e0b\u9762\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u5e26\u5927\u5bb6\u804a\u804a\u300aRedis\u6e90\u7801\u4e0e\u8bbe\u8ba1\u5256\u6790\u4e4b\u7f51\u7edc\u8fde\u63a5\u5e93\u300b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\u6e90\u7801\u3001Redis\u7f51\u7edc\u8fde\u63a5\u5e93\u3001\u8bbe\u8ba1\u5256\u6790\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n

Redis \u7f51\u7edc\u8fde\u63a5\u5e93\u5206\u6790<\/h2>\n

1. Redis\u7f51\u7edc\u8fde\u63a5\u5e93\u4ecb\u7ecd<\/h3>\n

Redis\u7f51\u7edc\u8fde\u63a5\u5e93\u5bf9\u5e94\u7684\u6587\u4ef6\u662fnetworking.c<\/code>\uff0c\u8fd9\u4e2a\u6587\u4ef6\u4e3b\u8981\u8d1f\u8d23\uff1a<\/p>\n

    \n
  • \u5ba2\u6237\u7aef\u7684\u521b\u5efa\u4e0e\u91ca\u653e.<\/li>\n
  • \u547d\u4ee4\u63a5\u6536\u4e0e\u547d\u4ee4\u56de\u590d.<\/li>\n
  • Redis\u901a\u4fe1\u534f\u8bae\u5206\u6790.<\/li>\n
  • CLIENT \u547d\u4ee4\u7684\u5b9e\u73b0.<\/li>\n<\/ul>\n

    2. \u5ba2\u6237\u7aef\u7684\u521b\u5efa\u4e0e\u91ca\u653e<\/h3>\n

    2.1 \u5ba2\u6237\u7aef\u7684\u521b\u5efa<\/h4>\n

    Redis\u670d\u52a1\u5668\u662f\u4e00\u4e2a\u540c\u65f6\u4e0e\u591a\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u7a0b\u5e8f. \u5f53\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u670d\u52a1\u5668\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u5efa\u7acb\u4e00\u4e2aserver.h\/client<\/code>\u7ed3\u6784\u6765\u4fdd\u5b58\u5ba2\u6237\u7aef\u7684\u72b6\u6001\u4fe1\u606f. server.h\/client<\/code>\u7ed3\u6784\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

    typedef struct client {\n    \/\/ client\u72ec\u4e00\u65e0\u4e8c\u7684ID\n    uint64_t id;            \/* Client incremental unique ID. *\/\n    \/\/ client\u7684\u5957\u63a5\u5b57\n    int fd;                 \/* Client socket. *\/\n    \/\/ \u6307\u5411\u5f53\u524d\u7684\u6570\u636e\u5e93\n    redisDb *db;            \/* Pointer to currently SELECTed DB. *\/\n    \/\/ \u4fdd\u5b58\u6307\u5411\u6570\u636e\u5e93\u7684ID\n    int dictid;             \/* ID of the currently SELECTed DB. *\/\n    \/\/ client\u7684\u540d\u5b57\n    robj *name;             \/* As set by CLIENT SETNAME. *\/\n    \/\/ \u8f93\u5165\u7f13\u51b2\u533a\n    sds querybuf;           \/* Buffer we use to accumulate client queries. *\/\n    \/\/ \u8f93\u5165\u7f13\u5b58\u7684\u5cf0\u503c\n    size_t querybuf_peak;   \/* Recent (100ms or more) peak of querybuf size. *\/\n    \/\/ client\u8f93\u5165\u547d\u4ee4\u65f6\uff0c\u53c2\u6570\u7684\u6570\u91cf\n    int argc;               \/* Num of arguments of current command. *\/\n    \/\/ client\u8f93\u5165\u547d\u4ee4\u7684\u53c2\u6570\u5217\u8868\n    robj **argv;            \/* Arguments of current command. *\/\n    \/\/ \u4fdd\u5b58\u5ba2\u6237\u7aef\u6267\u884c\u547d\u4ee4\u7684\u5386\u53f2\u8bb0\u5f55\n    struct redisCommand *cmd, *lastcmd;  \/* Last command executed. *\/\n    \/\/ \u8bf7\u6c42\u534f\u8bae\u7c7b\u578b\uff0c\u5185\u8054\u6216\u8005\u591a\u6761\u547d\u4ee4\n    int reqtype;            \/* Request protocol type: PROTO_REQ_* *\/\n    \/\/ \u53c2\u6570\u5217\u8868\u4e2d\u672a\u8bfb\u53d6\u547d\u4ee4\u53c2\u6570\u7684\u6570\u91cf\uff0c\u8bfb\u53d6\u4e00\u4e2a\uff0c\u8be5\u503c\u51cf1\n    int multibulklen;       \/* Number of multi bulk arguments left to read. *\/\n    \/\/ \u547d\u4ee4\u5185\u5bb9\u7684\u957f\u5ea6\n    long bulklen;           \/* Length of bulk argument in multi bulk request. *\/\n    \/\/ \u56de\u590d\u7f13\u5b58\u5217\u8868\uff0c\u7528\u4e8e\u53d1\u9001\u5927\u4e8e\u56fa\u5b9a\u56de\u590d\u7f13\u51b2\u533a\u7684\u56de\u590d\n    list *reply;            \/* List of reply objects to send to the client. *\/\n    \/\/ \u56de\u590d\u7f13\u5b58\u5217\u8868\u5bf9\u8c61\u7684\u603b\u5b57\u8282\u6570\n    unsigned long long reply_bytes; \/* Tot bytes of objects in reply list. *\/\n    \/\/ \u5df2\u53d1\u9001\u7684\u5b57\u8282\u6570\u6216\u5bf9\u8c61\u7684\u5b57\u8282\u6570\n    size_t sentlen;         \/* Amount of bytes already sent in the current\n                               buffer or object being sent. *\/\n    \/\/ client\u521b\u5efa\u6240\u9700\u65f6\u95f4\n    time_t ctime;           \/* Client creation time. *\/\n    \/\/ \u6700\u540e\u4e00\u6b21\u548c\u670d\u52a1\u5668\u4ea4\u4e92\u7684\u65f6\u95f4\n    time_t lastinteraction; \/* Time of the last interaction, used for timeout *\/\n    \/\/ \u5ba2\u6237\u7aef\u7684\u8f93\u51fa\u7f13\u51b2\u533a\u8d85\u8fc7\u8f6f\u6027\u9650\u5236\u7684\u65f6\u95f4\uff0c\u8bb0\u5f55\u8f93\u51fa\u7f13\u51b2\u533a\u7b2c\u4e00\u6b21\u5230\u8fbe\u8f6f\u6027\u9650\u5236\u7684\u65f6\u95f4\n    time_t obuf_soft_limit_reached_time;\n    \/\/ client\u72b6\u6001\u7684\u6807\u5fd7\n    int flags;              \/* Client flags: CLIENT_* macros. *\/\n    \/\/ \u8ba4\u8bc1\u6807\u5fd7\uff0c0\u8868\u793a\u672a\u8ba4\u8bc1\uff0c1\u8868\u793a\u5df2\u8ba4\u8bc1\n    int authenticated;      \/* When requirepass is non-NULL. *\/\n    \/\/ \u4ece\u8282\u70b9\u7684\u590d\u5236\u72b6\u6001\n    int replstate;          \/* Replication state if this is a slave. *\/\n    \/\/ \u5728ack\u4e0a\u8bbe\u7f6e\u4ece\u8282\u70b9\u7684\u5199\u5904\u7406\u5668\uff0c\u662f\u5426\u5728slave\u5411master\u53d1\u9001ack\uff0c\n    int repl_put_online_on_ack; \/* Install slave write handler on ACK. *\/\n    \/\/ \u4fdd\u5b58\u4e3b\u670d\u52a1\u5668\u4f20\u6765\u7684RDB\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n    int repldbfd;           \/* Replication DB file descriptor. *\/\n    \/\/ \u8bfb\u53d6\u4e3b\u670d\u52a1\u5668\u4f20\u6765\u7684RDB\u6587\u4ef6\u7684\u504f\u79fb\u91cf\n    off_t repldboff;        \/* Replication DB file offset. *\/\n    \/\/ \u4e3b\u670d\u52a1\u5668\u4f20\u6765\u7684RDB\u6587\u4ef6\u7684\u5927\u5c0f\n    off_t repldbsize;       \/* Replication DB file size. *\/\n    \/\/ \u4e3b\u670d\u52a1\u5668\u4f20\u6765\u7684RDB\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u7b26\u5408\u534f\u8bae\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\n    sds replpreamble;       \/* Replication DB preamble. *\/\n    \/\/ replication\u590d\u5236\u7684\u504f\u79fb\u91cf\n    long long reploff;      \/* Replication offset if this is our master. *\/\n    \/\/ \u901a\u8fc7ack\u547d\u4ee4\u63a5\u6536\u5230\u7684\u504f\u79fb\u91cf\n    long long repl_ack_off; \/* Replication ack offset, if this is a slave. *\/\n    \/\/ \u901a\u8fc7ack\u547d\u4ee4\u63a5\u6536\u5230\u7684\u504f\u79fb\u91cf\u6240\u7528\u7684\u65f6\u95f4\n    long long repl_ack_time;\/* Replication ack time, if this is a slave. *\/\n    \/\/ FULLRESYNC\u56de\u590d\u7ed9\u4ece\u8282\u70b9\u7684offset\n    long long psync_initial_offset; \/* FULLRESYNC reply offset other slaves\n                                       copying this slave output buffer\n                                       should use. *\/\n    char replrunid[CONFIG_RUN_ID_SIZE+1]; \/* Master run id if is a master. *\/\n    \/\/ \u4ece\u8282\u70b9\u7684\u7aef\u53e3\u53f7\n    int slave_listening_port; \/* As configured with: REPLCONF listening-port *\/\n    \/\/ \u4ece\u8282\u70b9IP\u5730\u5740\n    char slave_ip[NET_IP_STR_LEN]; \/* Optionally given by REPLCONF ip-address *\/\n    \/\/ \u4ece\u8282\u70b9\u7684\u529f\u80fd\n    int slave_capa;         \/* Slave capabilities: SLAVE_CAPA_* bitwise OR. *\/\n    \/\/ \u4e8b\u7269\u72b6\u6001\n    multiState mstate;      \/* MULTI\/EXEC state *\/\n    \/\/ \u963b\u585e\u7c7b\u578b\n    int btype;              \/* Type of blocking op if CLIENT_BLOCKED. *\/\n    \/\/ \u963b\u585e\u7684\u72b6\u6001\n    blockingState bpop;     \/* blocking state *\/\n    \/\/ \u6700\u8fd1\u4e00\u4e2a\u5199\u5168\u5c40\u7684\u590d\u5236\u504f\u79fb\u91cf\n    long long woff;         \/* Last write global replication offset. *\/\n    \/\/ \u76d1\u63a7\u5217\u8868\n    list *watched_keys;     \/* Keys WATCHED for MULTI\/EXEC CAS *\/\n    \/\/ \u8ba2\u9605\u9891\u9053\n    dict *pubsub_channels;  \/* channels a client is interested in (SUBSCRIBE) *\/\n    \/\/ \u8ba2\u9605\u7684\u6a21\u5f0f\n    list *pubsub_patterns;  \/* patterns a client is interested in (SUBSCRIBE) *\/\n    \/\/ \u88ab\u7f13\u5b58\u7684ID\n    sds peerid;             \/* Cached peer ID. *\/\n    \/* Response buffer *\/\n    \/\/ \u56de\u590d\u56fa\u5b9a\u7f13\u51b2\u533a\u7684\u504f\u79fb\u91cf\n    int bufpos;\n    \/\/ \u56de\u590d\u56fa\u5b9a\u7f13\u51b2\u533a\n    char buf[PROTO_REPLY_CHUNK_BYTES];\n} client;\n<\/pre>\n
    \u521b\u5efa\u5ba2\u6237\u7aef\u7684\u6e90\u7801\uff1a<\/p>\n
    \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684client\nclient *createClient(int fd) {\n    client *c = zmalloc(sizeof(client));    \/\/\u5206\u914d\u7a7a\u95f4\n    \/\/ \u5982\u679cfd\u4e3a-1\uff0c\u8868\u793a\u521b\u5efa\u7684\u662f\u4e00\u4e2a\u65e0\u7f51\u7edc\u8fde\u63a5\u7684\u4f2a\u5ba2\u6237\u7aef\uff0c\u7528\u4e8e\u6267\u884clua\u811a\u672c\u7684\u65f6\u5019\n    \/\/ \u5982\u679cfd\u4e0d\u7b49\u4e8e-1\uff0c\u8868\u793a\u521b\u5efa\u4e00\u4e2a\u6709\u7f51\u7edc\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\n    if (fd != -1) {\n        \/\/ \u8bbe\u7f6efd\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\n        anetNonBlock(NULL,fd);\n        \/\/ \u7981\u6b62\u4f7f\u7528 Nagle \u7b97\u6cd5\uff0cclient\u5411\u5185\u6838\u9012\u4ea4\u7684\u6bcf\u4e2a\u6570\u636e\u5305\u90fd\u4f1a\u7acb\u5373\u53d1\u9001\u7ed9server\u51fa\u53bb\uff0cTCP_NODELAY\n        anetEnableTcpNoDelay(NULL,fd);\n        \/\/ \u5982\u679c\u5f00\u542f\u4e86tcpkeepalive\uff0c\u5219\u8bbe\u7f6e SO_KEEPALIVE\n        if (server.tcpkeepalive)\n            \/\/ \u8bbe\u7f6etcp\u8fde\u63a5\u7684keep alive\u9009\u9879\n            anetKeepAlive(NULL,fd,server.tcpkeepalive);\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u4e8b\u4ef6\u72b6\u6001el\uff0c\u4e14\u76d1\u542c\u8bfb\u4e8b\u4ef6\uff0c\u5f00\u59cb\u63a5\u53d7\u547d\u4ee4\u7684\u8f93\u5165\n        if (aeCreateFileEvent(server.el,fd,AE_READABLE,\n            readQueryFromClient, c) == AE_ERR)\n        {\n            close(fd);\n            zfree(c);\n            return NULL;\n        }\n    }\n    \/\/ \u9ed8\u8ba4\u90090\u53f7\u6570\u636e\u5e93\n    selectDb(c,0);\n    \/\/ \u8bbe\u7f6eclient\u7684ID\n    c->id = server.next_client_id++;\n    \/\/ client\u7684\u5957\u63a5\u5b57\n    c->fd = fd;\n    \/\/ client\u7684\u540d\u5b57\n    c->name = NULL;\n    \/\/ \u56de\u590d\u56fa\u5b9a(\u9759\u6001)\u7f13\u51b2\u533a\u7684\u504f\u79fb\u91cf\n    c->bufpos = 0;\n    \/\/ \u8f93\u5165\u7f13\u5b58\u533a\n    c->querybuf = sdsempty();\n    \/\/ \u8f93\u5165\u7f13\u5b58\u533a\u7684\u5cf0\u503c\n    c->querybuf_peak = 0;\n    \/\/ \u8bf7\u6c42\u534f\u8bae\u7c7b\u578b\uff0c\u5185\u8054\u6216\u8005\u591a\u6761\u547d\u4ee4\uff0c\u521d\u59cb\u5316\u4e3a0\n    c->reqtype = 0;\n    \/\/ \u53c2\u6570\u4e2a\u6570\n    c->argc = 0;\n    \/\/ \u53c2\u6570\u5217\u8868\n    c->argv = NULL;\n    \/\/ \u5f53\u524d\u6267\u884c\u7684\u547d\u4ee4\u548c\u6700\u8fd1\u4e00\u6b21\u6267\u884c\u7684\u547d\u4ee4\n    c->cmd = c->lastcmd = NULL;\n    \/\/ \u67e5\u8be2\u7f13\u51b2\u533a\u5269\u4f59\u672a\u8bfb\u53d6\u547d\u4ee4\u7684\u6570\u91cf\n    c->multibulklen = 0;\n    \/\/ \u8bfb\u5165\u53c2\u6570\u7684\u957f\u5ea6\n    c->bulklen = -1;\n    \/\/ \u5df2\u53d1\u7684\u5b57\u8282\u6570\n    c->sentlen = 0;\n    \/\/ client\u7684\u72b6\u6001\n    c->flags = 0;\n    \/\/ \u8bbe\u7f6e\u521b\u5efaclient\u7684\u65f6\u95f4\u548c\u6700\u540e\u4e00\u6b21\u4e92\u52a8\u7684\u65f6\u95f4\n    c->ctime = c->lastinteraction = server.unixtime;\n    \/\/ \u8ba4\u8bc1\u72b6\u6001\n    c->authenticated = 0;\n    \/\/ replication\u590d\u5236\u7684\u72b6\u6001\uff0c\u521d\u59cb\u4e3a\u65e0\n    c->replstate = REPL_STATE_NONE;\n    \/\/ \u8bbe\u7f6e\u4ece\u8282\u70b9\u7684\u5199\u5904\u7406\u5668\u4e3aack\uff0c\u662f\u5426\u5728slave\u5411master\u53d1\u9001ack\n    c->repl_put_online_on_ack = 0;\n    \/\/ replication\u590d\u5236\u7684\u504f\u79fb\u91cf\n    c->reploff = 0;\n    \/\/ \u901a\u8fc7ack\u547d\u4ee4\u63a5\u6536\u5230\u7684\u504f\u79fb\u91cf\n    c->repl_ack_off = 0;\n    \/\/ \u901a\u8fc7ack\u547d\u4ee4\u63a5\u6536\u5230\u7684\u504f\u79fb\u91cf\u6240\u7528\u7684\u65f6\u95f4\n    c->repl_ack_time = 0;\n    \/\/ \u4ece\u8282\u70b9\u7684\u7aef\u53e3\u53f7\n    c->slave_listening_port = 0;\n    \/\/ \u4ece\u8282\u70b9IP\u5730\u5740\n    c->slave_ip[0] = '\\0';\n    \/\/ \u4ece\u8282\u70b9\u7684\u529f\u80fd\n    c->slave_capa = SLAVE_CAPA_NONE;\n    \/\/ \u56de\u590d\u94fe\u8868\n    c->reply = listCreate();\n    \/\/ \u56de\u590d\u94fe\u8868\u7684\u5b57\u8282\u6570\n    c->reply_bytes = 0;\n    \/\/ \u56de\u590d\u7f13\u51b2\u533a\u7684\u5185\u5b58\u5927\u5c0f\u8f6f\u9650\u5236\n    c->obuf_soft_limit_reached_time = 0;\n    \/\/ \u56de\u590d\u94fe\u8868\u7684\u91ca\u653e\u548c\u590d\u5236\u65b9\u6cd5\n    listSetFreeMethod(c->reply,decrRefCountVoid);\n    listSetDupMethod(c->reply,dupClientReplyValue);\n    \/\/ \u963b\u585e\u7c7b\u578b\n    c->btype = BLOCKED_NONE;\n    \/\/ \u963b\u585e\u8d85\u8fc7\u65f6\u95f4\n    c->bpop.timeout = 0;\n    \/\/ \u9020\u6210\u963b\u585e\u7684\u952e\u5b57\u5178\n    c->bpop.keys = dictCreate(&setDictType,NULL);\n    \/\/ \u5b58\u50a8\u89e3\u9664\u963b\u585e\u7684\u952e\uff0c\u7528\u4e8e\u4fdd\u5b58PUSH\u5165\u5143\u7d20\u7684\u952e\uff0c\u4e5f\u5c31\u662fdstkey\n    c->bpop.target = NULL;\n    \/\/ \u963b\u585e\u72b6\u6001\n    c->bpop.numreplicas = 0;\n    \/\/ \u8981\u8fbe\u5230\u7684\u590d\u5236\u504f\u79fb\u91cf\n    c->bpop.reploffset = 0;\n    \/\/ \u5168\u5c40\u7684\u590d\u5236\u504f\u79fb\u91cf\n    c->woff = 0;\n    \/\/ \u76d1\u63a7\u7684\u952e\n    c->watched_keys = listCreate();\n    \/\/ \u8ba2\u9605\u9891\u9053\n    c->pubsub_channels = dictCreate(&setDictType,NULL);\n    \/\/ \u8ba2\u9605\u6a21\u5f0f\n    c->pubsub_patterns = listCreate();\n    \/\/ \u88ab\u7f13\u5b58\u7684peerid\uff0cpeerid\u5c31\u662f ip:port\n    c->peerid = NULL;\n    \/\/ \u8ba2\u9605\u53d1\u5e03\u6a21\u5f0f\u7684\u91ca\u653e\u548c\u6bd4\u8f83\u65b9\u6cd5\n    listSetFreeMethod(c->pubsub_patterns,decrRefCountVoid);\n    listSetMatchMethod(c->pubsub_patterns,listMatchObjects);\n    \/\/ \u5c06\u771f\u6b63\u7684client\u653e\u5728\u670d\u52a1\u5668\u7684\u5ba2\u6237\u7aef\u94fe\u8868\u4e2d\n    if (fd != -1) listAddNodeTail(server.clients,c);\n    \/\/ \u521d\u59cb\u5316client\u7684\u4e8b\u7269\u72b6\u6001\n    initClientMultiState(c);\n    return c;\n}\n<\/pre>\n
    \u6839\u636e\u521b\u5efa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/code>\uff0c\u53ef\u4ee5\u521b\u5efa\u7528\u4e8e\u4e0d\u540c\u573a\u666f\u4e0b\u7684client<\/code>. \u8fd9\u4e2afd<\/code>\u5c31\u662f\u670d\u52a1\u5668\u63a5\u6536\u5ba2\u6237\u7aefconnect<\/code>\u540e\u6240\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26.<\/p>\n
      \n
    • fd == -1<\/code>\uff0c\u8868\u793a\u521b\u5efa\u4e00\u4e2a\u65e0\u7f51\u7edc\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u3002\u4e3b\u8981\u7528\u4e8e\u6267\u884c lua \u811a\u672c\u65f6.<\/li>\n
    • fd != -1<\/code>\uff0c\u8868\u793a\u63a5\u6536\u5230\u4e00\u4e2a\u6b63\u5e38\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u5219\u4f1a\u521b\u5efa\u4e00\u4e2a\u6709\u7f51\u7edc\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\uff0c\u4e5f\u5c31\u662f\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u4e8b\u4ef6\uff0c\u6765\u76d1\u542c\u8fd9\u4e2afd\u662f\u5426\u53ef\u8bfb\uff0c\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\uff0c\u5219\u4e8b\u4ef6\u88ab\u89e6\u53d1.<\/li>\n<\/ul>\n
      \u521b\u5efa\u5ba2\u6237\u7aef\u7684\u8fc7\u7a0b\uff0c\u4f1a\u5c06server.h\/client<\/code>\u7ed3\u6784\u7684\u6240\u6709\u6210\u5458\u521d\u59cb\u5316\uff0c\u63a5\u4e0b\u91cc\u4f1a\u4ecb\u7ecd\u90e8\u5206\u91cd\u70b9\u7684\u6210\u5458.<\/p>\n
      int id<\/code>\uff1a\u670d\u52a1\u5668\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u8fde\u63a5\u8fdb\u6765\u7684\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2aID\uff0c\u5ba2\u6237\u7aef\u7684ID\u4ece1\u5f00\u59cb\u3002\u6bcf\u6b21\u91cd\u542f\u670d\u52a1\u5668\u4f1a\u5237\u65b0. int fd<\/code>\uff1a\u5f53\u524d\u5ba2\u6237\u7aef\u72b6\u6001\u63cf\u8ff0\u7b26\u3002\u5206\u4e3a\u65e0\u7f51\u7edc\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u548c\u6709\u7f51\u7edc\u8fde\u63a5\u7684\u5ba2\u6237\u7aef. int flags<\/code>\uff1a\u5ba2\u6237\u7aef\u72b6\u6001\u7684\u6807\u5fd7. robj *name<\/code>\uff1a\u9ed8\u8ba4\u521b\u5efa\u7684\u5ba2\u6237\u7aef\u662f\u6ca1\u6709\u540d\u5b57\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7CLIENT SETNAME<\/code>\u547d\u4ee4\u8bbe\u7f6e\u540d\u5b57. \u540e\u9762\u4f1a\u4ecb\u7ecd\u8be5\u547d\u4ee4\u7684\u5b9e\u73b0. int reqtype<\/code>\uff1a\u8bf7\u6c42\u534f\u8bae\u7684\u7c7b\u578b. \u56e0\u4e3aRedis\u670d\u52a1\u5668\u652f\u6301Telnet<\/code>\u7684\u8fde\u63a5\uff0c\u56e0\u6b64Telnet\u547d\u4ee4\u8bf7\u6c42\u534f\u8bae\u7c7b\u578b\u662fPROTO_REQ_INLINE<\/code>\uff0c\u800credis-cli<\/code>\u547d\u4ee4\u8bf7\u6c42\u7684\u534f\u8bae\u7c7b\u578b\u662fPROTO_REQ_MULTIBULK<\/code>.<\/p>\n
      \u7528\u4e8e\u4fdd\u5b58\u670d\u52a1\u5668\u63a5\u53d7\u5ba2\u6237\u7aef\u547d\u4ee4\u7684\u6210\u5458\uff1a<\/p>\n
      sds querybuf<\/code>\uff1a\u4fdd\u5b58\u5ba2\u6237\u7aef\u53d1\u6765\u547d\u4ee4\u8bf7\u6c42\u7684\u8f93\u5165\u7f13\u51b2\u533a. \u4ee5Redis\u901a\u4fe1\u534f\u8bae\u7684\u65b9\u5f0f\u4fdd\u5b58. size_t querybuf_peak<\/code>\uff1a\u4fdd\u5b58\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5cf0\u503c. int argc<\/code>\uff1a\u547d\u4ee4\u53c2\u6570\u4e2a\u6570. robj *argv<\/code>\uff1a\u547d\u4ee4\u53c2\u6570\u5217\u8868.<\/p>\n
      \u7528\u4e8e\u4fdd\u5b58\u670d\u52a1\u5668\u7ed9\u5ba2\u6237\u7aef\u56de\u590d\u7684\u6210\u5458\uff1a<\/p>\n
      char buf[16*1024]<\/code>\uff1a\u4fdd\u5b58\u6267\u884c\u5b8c\u547d\u4ee4\u6240\u5f97\u547d\u4ee4\u56de\u590d\u4fe1\u606f\u7684\u9759\u6001\u7f13\u51b2\u533a\uff0c\u5b83\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u6240\u4ee5\u4e3b\u8981\u4fdd\u5b58\u7684\u662f\u4e00\u4e9b\u6bd4\u8f83\u77ed\u7684\u56de\u590d. \u5206\u914dclient<\/code>\u7ed3\u6784\u7a7a\u95f4\u65f6\uff0c\u5c31\u4f1a\u5206\u914d\u4e00\u4e2a16K<\/code>\u7684\u5927\u5c0f. int bufpos<\/code>\uff1a\u8bb0\u5f55\u9759\u6001\u7f13\u51b2\u533a\u7684\u504f\u79fb\u91cf\uff0c\u4e5f\u5c31\u662fbuf\u6570\u7ec4\u5df2\u7ecf\u4f7f\u7528\u7684\u5b57\u8282\u6570. list *reply<\/code>\uff1a\u4fdd\u5b58\u547d\u4ee4\u56de\u590d\u7684\u94fe\u8868. \u56e0\u4e3a\u9759\u6001\u7f13\u51b2\u533a\u5927\u5c0f\u56fa\u5b9a\uff0c\u4e3b\u8981\u4fdd\u5b58\u56fa\u5b9a\u957f\u5ea6\u7684\u547d\u4ee4\u56de\u590d\uff0c\u5f53\u5904\u7406\u4e00\u4e9b\u8fd4\u56de\u5927\u91cf\u56de\u590d\u7684\u547d\u4ee4\uff0c\u5219\u4f1a\u5c06\u547d\u4ee4\u56de\u590d\u4ee5\u94fe\u8868\u7684\u5f62\u5f0f\u8fde\u63a5\u8d77\u6765. unsigned long long reply_bytes<\/code>\uff1a\u4fdd\u5b58\u56de\u590d\u94fe\u8868\u7684\u5b57\u8282\u6570. size_t sentlen<\/code>\uff1a\u5df2\u53d1\u9001\u56de\u590d\u7684\u5b57\u8282\u6570.<\/p>\n
      2.2 \u5ba2\u6237\u7aef\u7684\u91ca\u653e<\/h4>\n
      \u5ba2\u6237\u7aef\u91ca\u653e\u7684\u51fd\u6570\u662ffreeClient()<\/code>\uff0c\u4e3b\u8981\u5c31\u662f\u91ca\u653e\u5404\u79cd\u6570\u636e\u7ed3\u6784\u548c\u6e05\u7a7a\u4e00\u4e9b\u7f13\u51b2\u533a\u7b49\u64cd\u4f5c\uff0c\u8fd9\u91cc\u5c31\u4e0d\u518d\u5217\u51fa\u6e90\u7801.<\/p>\n
      \u6211\u4eec\u53ef\u4ee5\u91cd\u70b9\u5173\u6ce8\u4e00\u4e0b\u5f02\u6b65\u91ca\u653e\u5ba2\u6237\u7aef\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n
      \/\/ \u5f02\u6b65\u91ca\u653eclient\nvoid freeClientAsync(client *c) {\n    \/\/ \u5982\u679c\u662f\u5df2\u7ecf\u5373\u5c06\u5173\u95ed\u6216\u8005\u662flua\u811a\u672c\u7684\u4f2aclient\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\n    if (c->flags & CLIENT_CLOSE_ASAP || c->flags & CLIENT_LUA) return;\n    c->flags |= CLIENT_CLOSE_ASAP;\n    \/\/ \u5c06client\u52a0\u5165\u5230\u5373\u5c06\u5173\u95ed\u7684client\u94fe\u8868\u4e2d\n    \/\/ server.clients_to_close \u4e2d\u4fdd\u5b58\u7740\u670d\u52a1\u5668\u4e2d\u6240\u6709\u5f85\u5173\u95ed\u7684\u94fe\u8868\n    listAddNodeTail(server.clients_to_close,c);\n}\n<\/pre>\n
      \u8bbe\u7f6e\u5f02\u6b65\u91ca\u653e\u5ba2\u6237\u7aef\u7684\u76ee\u7684\u4e3b\u8981\u662f\uff1a\u9632\u6b62\u5e95\u5c42\u51fd\u6570\u6b63\u5728\u5411\u5ba2\u6237\u7aef\u7684\u8f93\u51fa\u7f13\u51b2\u533a\u5199\u6570\u636e\u7684\u65f6\u5019\uff0c\u5173\u95ed\u5ba2\u6237\u7aef\uff0c\u8fd9\u6837\u662f\u4e0d\u5b89\u5168\u7684. Redis\u4f1a\u5b89\u6392\u5ba2\u6237\u7aef\u5728serverCron()<\/code>\u51fd\u6570\u7684\u5b89\u5168\u65f6\u95f4\u91ca\u653e\u5b83.<\/p>\n
      \u5f53\u7136\u4e5f\u53ef\u4ee5\u53d6\u6d88\u5f02\u6b65\u91ca\u653e\uff0c\u90a3\u4e48\u5c31\u4f1a\u8c03\u7528freeClient()<\/code>\u51fd\u6570\u7acb\u5373\u91ca\u653e\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n
      \/\/ \u53d6\u6d88\u8bbe\u7f6e\u5f02\u6b65\u91ca\u653e\u7684client\nvoid freeClientsInAsyncFreeQueue(void) {\n    \/\/ \u904d\u5386\u6240\u6709\u5373\u5c06\u5173\u95ed\u7684client\n    while (listLength(server.clients_to_close)) {\n        listNode *ln = listFirst(server.clients_to_close);\n        client *c = listNodeValue(ln);\n        \/\/ \u53d6\u6d88\u7acb\u5373\u5173\u95ed\u7684\u6807\u5fd7\n        c->flags &= ~CLIENT_CLOSE_ASAP;\n        freeClient(c);\n        \/\/ \u4ece\u5373\u5c06\u5173\u95ed\u7684client\u94fe\u8868\u4e2d\u5220\u9664\n        listDelNode(server.clients_to_close,ln);\n    }\n}\n<\/pre>\n
      3. \u547d\u4ee4\u63a5\u6536\u4e0e\u547d\u4ee4\u56de\u590d<\/h3>\n
      3.1 \u547d\u4ee4\u63a5\u6536<\/h4>\n
      \u5f53\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0aRedis\u670d\u52a1\u5668\u540e\uff0c\u670d\u52a1\u5668\u4f1a\u5f97\u5230\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/code>\uff0c\u800c\u4e14\u670d\u52a1\u5668\u4f1a\u76d1\u542c\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\uff0c\u8fd9\u4e9b\u5728createClient()<\/code>\u51fd\u6570\u4e2d. \u90a3\u4e48\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u4e86\u547d\u4ee4\uff0c\u89e6\u53d1\u4e86AE_READABLE<\/code>\u4e8b\u4ef6\uff0c\u90a3\u4e48\u5c31\u4f1a\u8c03\u7528\u56de\u8c03\u51fd\u6570readQueryFromClient()<\/code>\u6765\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u4e2d\u8bfb\u53d1\u6765\u7684\u547d\u4ee4\uff0c\u5e76\u4fdd\u5b58\u5728\u8f93\u5165\u7f13\u51b2\u533aquerybuf<\/code>\u4e2d. \u800c\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\u5c31\u662f\u6211\u4eec\u5728Redis\u4e8b\u4ef6\u5904\u7406\u4e00\u6587\u4e2d\u6240\u63d0\u5230\u7684\u6307\u5411\u56de\u8c03\u51fd\u6570\u7684\u6307\u9488rfileProc<\/code>\u548cwfileProc<\/code>. \u90a3\u4e48\uff0c\u6211\u4eec\u5148\u6765\u5206\u6790readQueryFromClient<\/code>\u51fd\u6570.<\/p>\n
      \/\/ \u8bfb\u53d6client\u7684\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5185\u5bb9\nvoid readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {\n    client *c = (client*) privdata;\n    int nread, readlen;\n    size_t qblen;\n    UNUSED(el);\n    UNUSED(mask);\n    \/\/ \u8bfb\u5165\u7684\u957f\u5ea6\uff0c\u9ed8\u8ba416MB\n    readlen = PROTO_IOBUF_LEN;\n    \/\/ \u5982\u679c\u662f\u591a\u6761\u8bf7\u6c42\uff0c\u6839\u636e\u8bf7\u6c42\u7684\u5927\u5c0f\uff0c\u8bbe\u7f6e\u8bfb\u5165\u7684\u957f\u5ea6readlen\n    if (c->reqtype == PROTO_REQ_MULTIBULK && c->multibulklen && c->bulklen != -1\n        && c->bulklen >= PROTO_MBULK_BIG_ARG)\n    {\n        int remaining = (unsigned)(c->bulklen+2)-sdslen(c->querybuf);\n        if (remaining querybuf);\n    \/\/ \u66f4\u65b0\u7f13\u51b2\u533a\u7684\u5cf0\u503c\n    if (c->querybuf_peak querybuf_peak = qblen;\n    \/\/ \u6269\u5c55\u7f13\u51b2\u533a\u7684\u5927\u5c0f\n    c->querybuf = sdsMakeRoomFor(c->querybuf, readlen);\n    \/\/ \u5c06client\u53d1\u6765\u7684\u547d\u4ee4\uff0c\u8bfb\u5165\u5230\u8f93\u5165\u7f13\u51b2\u533a\u4e2d\n    nread = read(fd, c->querybuf+qblen, readlen);\n    \/\/ \u8bfb\u64cd\u4f5c\u51fa\u9519\n    if (nread == -1) {\n        if (errno == EAGAIN) {\n            return;\n        } else {\n            serverLog(LL_VERBOSE, \"Reading from client: %s\",strerror(errno));\n            freeClient(c);\n            return;\n        }\n    \/\/ \u8bfb\u64cd\u4f5c\u5b8c\u6210\n    } else if (nread == 0) {\n        serverLog(LL_VERBOSE, \"Client closed connection\");\n        freeClient(c);\n        return;\n    }\n    \/\/ \u66f4\u65b0\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5df2\u7528\u5927\u5c0f\u548c\u672a\u7528\u5927\u5c0f\u3002\n    sdsIncrLen(c->querybuf,nread);\n    \/\/ \u8bbe\u7f6e\u6700\u540e\u4e00\u6b21\u670d\u52a1\u5668\u548cclient\u4ea4\u4e92\u7684\u65f6\u95f4\n    c->lastinteraction = server.unixtime;\n    \/\/ \u5982\u679c\u662f\u4e3b\u8282\u70b9\uff0c\u5219\u66f4\u65b0\u590d\u5236\u64cd\u4f5c\u7684\u504f\u79fb\u91cf\n    if (c->flags & CLIENT_MASTER) c->reploff += nread;\n    \/\/ \u66f4\u65b0\u4ece\u7f51\u7edc\u8f93\u5165\u7684\u5b57\u8282\u6570\n    server.stat_net_input_bytes += nread;\n    \/\/ \u5982\u679c\u8f93\u5165\u7f13\u51b2\u533a\u957f\u5ea6\u8d85\u8fc7\u670d\u52a1\u5668\u8bbe\u7f6e\u7684\u6700\u5927\u7f13\u51b2\u533a\u957f\u5ea6\n    if (sdslen(c->querybuf) > server.client_max_querybuf_len) {\n        \/\/ \u5c06client\u4fe1\u606f\u8f6c\u6362\u4e3asds\n        sds ci = catClientInfoString(sdsempty(),c), bytes = sdsempty();\n        \/\/ \u8f93\u5165\u7f13\u51b2\u533a\u4fdd\u5b58\u5728bytes\u4e2d\n        bytes = sdscatrepr(bytes,c->querybuf,64);\n        \/\/ \u6253\u5370\u5230\u65e5\u5fd7\n        serverLog(LL_WARNING,\"Closing client that reached max query buffer length: %s (qbuf initial bytes: %s)\", ci, bytes);\n        \/\/ \u91ca\u653e\u7a7a\u95f4\n        sdsfree(ci);\n        sdsfree(bytes);\n        freeClient(c);\n        return;\n    }\n    \/\/ \u5904\u7406client\u8f93\u5165\u7684\u547d\u4ee4\u5185\u5bb9\n    processInputBuffer(c);\n}\n<\/pre>\n
      \u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2areadQueryFromClient()<\/code>\u51fd\u6570\u662fread\u51fd\u6570\u7684\u5c01\u88c5\uff0c\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/code>\u4e2d\u8bfb\u51fa\u6570\u636e\u5230\u8f93\u5165\u7f13\u51b2\u533aquerybuf<\/code>\u4e2d\uff0c\u5e76\u66f4\u65b0\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5cf0\u503cquerybuf_peak<\/code>\uff0c\u800c\u4e14\u4f1a\u68c0\u67e5\u8bfb\u7684\u957f\u5ea6\uff0c\u5982\u679c\u5927\u4e8e\u4e86server.client_max_querybuf_len<\/code>\u5219\u4f1a\u9000\u51fa\uff0c\u800c\u8fd9\u4e2a\u9600\u503c\u5728\u670d\u52a1\u5668\u521d\u59cb\u5316\u4e3aPROTO_MAX_QUERYBUF_LEN (1024*1024*1024)<\/code>\u4e5f\u5c31\u662f1G<\/code>\u5927\u5c0f.<\/p>\n
      \u56de\u5fc6\u4e4b\u524d\u7684\u5404\u79cd\u547d\u4ee4\u5b9e\u73b0\uff0c\u90fd\u662f\u901a\u8fc7client\u7684argv\u548cargc\u8fd9\u4e24\u4e2a\u6210\u5458\u6765\u5904\u7406\u7684. \u56e0\u6b64\uff0c\u670d\u52a1\u5668\u8fd8\u9700\u8981\u5c06\u8f93\u5165\u7f13\u51b2\u533aquerybuf<\/code>\u4e2d\u7684\u6570\u636e\uff0c\u5904\u7406\u6210\u53c2\u6570\u5217\u8868\u7684\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u4e0a\u9762\u7684processInputBuffer()<\/code>\u51fd\u6570. \u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n
      \/\/ \u5904\u7406client\u8f93\u5165\u7684\u547d\u4ee4\u5185\u5bb9\nvoid processInputBuffer(client *c) {\n    server.current_client = c;\n    \/\/ \u4e00\u76f4\u8bfb\u8f93\u5165\u7f13\u51b2\u533a\u7684\u5185\u5bb9\n    while(sdslen(c->querybuf)) {\n        \/\/ \u5982\u679c\u5904\u4e8e\u6682\u505c\u72b6\u6001\uff0c\u76f4\u63a5\u8fd4\u56de\n        if (!(c->flags & CLIENT_SLAVE) && clientsArePaused()) break;\n        \/\/ \u5982\u679cclient\u5904\u4e8e\u88ab\u963b\u585e\u72b6\u6001\uff0c\u76f4\u63a5\u8fd4\u56de\n        if (c->flags & CLIENT_BLOCKED) break;\n        \/\/ \u5982\u679cclient\u5904\u4e8e\u5173\u95ed\u72b6\u6001\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\n        if (c->flags & (CLIENT_CLOSE_AFTER_REPLY|CLIENT_CLOSE_ASAP)) break;\n        \/\/ \u5982\u679c\u662f\u672a\u77e5\u7684\u8bf7\u6c42\u7c7b\u578b\uff0c\u5219\u5224\u5b9a\u8bf7\u6c42\u7c7b\u578b\n        if (!c->reqtype) {\n            \/\/ \u5982\u679c\u662f\"*\"\u5f00\u5934\uff0c\u5219\u662f\u591a\u6761\u8bf7\u6c42\uff0c\u662fclient\u53d1\u6765\u7684\n            if (c->querybuf[0] == '*') {\n                c->reqtype = PROTO_REQ_MULTIBULK;\n            \/\/ \u5426\u5219\u5c31\u662f\u5185\u8054\u8bf7\u6c42\uff0c\u662fTelnet\u53d1\u6765\u7684\n            } else {\n                c->reqtype = PROTO_REQ_INLINE;\n            }\n        }\n        \/\/ \u5982\u679c\u662f\u5185\u8054\u8bf7\u6c42\n        if (c->reqtype == PROTO_REQ_INLINE) {\n            \/\/ \u5904\u7406Telnet\u53d1\u6765\u7684\u5185\u8054\u547d\u4ee4\uff0c\u5e76\u521b\u5efa\u6210\u5bf9\u8c61\uff0c\u4fdd\u5b58\u5728client\u7684\u53c2\u6570\u5217\u8868\u4e2d\n            if (processInlineBuffer(c) != C_OK) break;\n        \/\/ \u5982\u679c\u662f\u591a\u6761\u8bf7\u6c42\n        } else if (c->reqtype == PROTO_REQ_MULTIBULK) {\n            \/\/ \u5c06client\u7684querybuf\u4e2d\u7684\u534f\u8bae\u5185\u5bb9\u8f6c\u6362\u4e3aclient\u7684\u53c2\u6570\u5217\u8868\u4e2d\u7684\u5bf9\u8c61\n            if (processMultibulkBuffer(c) != C_OK) break;\n        } else {\n            serverPanic(\"Unknown request type\");\n        }\n        \/\/ \u5982\u679c\u53c2\u6570\u4e3a0\uff0c\u5219\u91cd\u7f6eclient\n        if (c->argc == 0) {\n            resetClient(c);\n        } else {\n            \/* Only reset the client when the command was executed. *\/\n            \/\/ \u6267\u884c\u547d\u4ee4\u6210\u529f\u540e\u91cd\u7f6eclient\n            if (processCommand(c) == C_OK)\n                resetClient(c);\n            if (server.current_client == NULL) break;\n        }\n    }\n    \/\/ \u6267\u884c\u6210\u529f\uff0c\u5219\u5c06\u7528\u4e8e\u5d29\u6e83\u62a5\u544a\u7684client\u8bbe\u7f6e\u4e3aNULL\n    server.current_client = NULL;\n}\n<\/pre>\n
      redis-cli<\/code>\u547d\u4ee4\u8bf7\u6c42\u7684\u534f\u8bae\u7c7b\u578b\u662fPROTO_REQ_MULTIBULK<\/code>\uff0c\u8fdb\u800c\u8c03\u7528processMultibulkBuffer()<\/code>\u51fd\u6570\u6765\u5904\u7406\uff1a<\/p>\n
      \/\/ \u5c06client\u7684querybuf\u4e2d\u7684\u534f\u8bae\u5185\u5bb9\u8f6c\u6362\u4e3aclient\u7684\u53c2\u6570\u5217\u8868\u4e2d\u7684\u5bf9\u8c61\nint processMultibulkBuffer(client *c) {\n    char *newline = NULL;\n    int pos = 0, ok;\n    long long ll;\n    \/\/ \u53c2\u6570\u5217\u8868\u4e2d\u547d\u4ee4\u6570\u91cf\u4e3a0\uff0c\u56e0\u6b64\u5148\u5206\u914d\u7a7a\u95f4\n    if (c->multibulklen == 0) {\n        \/* The client should have been reset *\/\n        serverAssertWithInfo(c,NULL,c->argc == 0);\n        \/* Multi bulk length cannot be read without a \\r\\n *\/\n        \/\/ \u67e5\u8be2\u7b2c\u4e00\u4e2a\u6362\u884c\u7b26\n        newline = strchr(c->querybuf,'\\r');\n        \/\/ \u6ca1\u6709\u627e\u5230\\r\\n\uff0c\u8868\u793a\u4e0d\u7b26\u5408\u534f\u8bae\uff0c\u8fd4\u56de\u9519\u8bef\n        if (newline == NULL) {\n            if (sdslen(c->querybuf) > PROTO_INLINE_MAX_SIZE) {\n                addReplyError(c,\"Protocol error: too big mbulk count string\");\n                setProtocolError(c,0);\n            }\n            return C_ERR;\n        }\n        \/* Buffer should also contain \\n *\/\n        \/\/ \u68c0\u67e5\u683c\u5f0f\n        if (newline-(c->querybuf) > ((signed)sdslen(c->querybuf)-2))\n            return C_ERR;\n        \/* We know for sure there is a whole line since newline != NULL,\n         * so go ahead and find out the multi bulk length. *\/\n        \/\/ \u4fdd\u8bc1\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4e3a'*'\n        serverAssertWithInfo(c,NULL,c->querybuf[0] == '*');\n        \/\/ \u5c06'*'\u4e4b\u540e\u7684\u6570\u5b57\u8f6c\u6362\u4e3a\u6574\u6570\u3002*3\\r\\n\n        ok = string2ll(c->querybuf+1,newline-(c->querybuf+1),&ll);\n        if (!ok || ll > 1024*1024) {\n            addReplyError(c,\"Protocol error: invalid multibulk length\");\n            setProtocolError(c,pos);\n            return C_ERR;\n        }\n        \/\/ \u6307\u5411\"*3\\r\\n\"\u7684\"\\r\\n\"\u4e4b\u540e\u7684\u4f4d\u7f6e\n        pos = (newline-c->querybuf)+2;\n        \/\/ \u7a7a\u767d\u547d\u4ee4\uff0c\u5219\u5c06\u4e4b\u524d\u7684\u5220\u9664\uff0c\u4fdd\u7559\u672a\u9605\u8bfb\u7684\u90e8\u5206\n        if (ll querybuf,pos,-1);\n            return C_OK;\n        }\n        \/\/ \u53c2\u6570\u6570\u91cf\n        c->multibulklen = ll;\n        \/* Setup argv array on client structure *\/\n        \/\/ \u5206\u914dclient\u53c2\u6570\u5217\u8868\u7684\u7a7a\u95f4\n        if (c->argv) zfree(c->argv);\n        c->argv = zmalloc(sizeof(robj*)*c->multibulklen);\n    }\n    serverAssertWithInfo(c,NULL,c->multibulklen > 0);\n    \/\/ \u8bfb\u5165multibulklen\u4e2a\u53c2\u6570\uff0c\u5e76\u521b\u5efa\u5bf9\u8c61\u4fdd\u5b58\u5728\u53c2\u6570\u5217\u8868\u4e2d\n    while(c->multibulklen) {\n        \/* Read bulk length if unknown *\/\n        \/\/ \u8bfb\u5165\u53c2\u6570\u7684\u957f\u5ea6\n        if (c->bulklen == -1) {\n            \/\/ \u627e\u5230\u6362\u884c\u7b26\uff0c\u786e\u4fdd\"\\r\\n\"\u5b58\u5728\n            newline = strchr(c->querybuf+pos,'\\r');\n            if (newline == NULL) {\n                if (sdslen(c->querybuf) > PROTO_INLINE_MAX_SIZE) {\n                    addReplyError(c,\n                        \"Protocol error: too big bulk count string\");\n                    setProtocolError(c,0);\n                    return C_ERR;\n                }\n                break;\n            }\n            \/* Buffer should also contain \\n *\/\n            \/\/ \u68c0\u67e5\u683c\u5f0f\n            if (newline-(c->querybuf) > ((signed)sdslen(c->querybuf)-2))\n                break;\n            \/\/ $3\\r\\nSET\\r\\n...\uff0c\u786e\u4fdd\u662f'$'\u5b57\u7b26\uff0c\u4fdd\u8bc1\u683c\u5f0f\n            if (c->querybuf[pos] != '$') {\n                addReplyErrorFormat(c,\n                    \"Protocol error: expected '$', got '%c'\",\n                    c->querybuf[pos]);\n                setProtocolError(c,pos);\n                return C_ERR;\n            }\n            \/\/ \u5c06\u53c2\u6570\u957f\u5ea6\u4fdd\u5b58\u5230ll\u3002\n            ok = string2ll(c->querybuf+pos+1,newline-(c->querybuf+pos+1),&ll);\n            if (!ok || ll  512*1024*1024) {\n                addReplyError(c,\"Protocol error: invalid bulk length\");\n                setProtocolError(c,pos);\n                return C_ERR;\n            }\n            \/\/ \u5b9a\u4f4d\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662fSET\u7684S\n            pos += newline-(c->querybuf+pos)+2;\n            \/\/ \u53c2\u6570\u957f\u5ea6\u592a\u957f\uff0c\u8fdb\u884c\u4f18\u5316\n            if (ll >= PROTO_MBULK_BIG_ARG) {\n                size_t qblen;\n                \/* If we are going to read a large object from network\n                 * try to make it likely that it will start at c->querybuf\n                 * boundary so that we can optimize object creation\n                 * avoiding a large copy of data. *\/\n                \/\/ \u5982\u679c\u6211\u4eec\u8981\u4ece\u7f51\u7edc\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u5927\u7684\u5bf9\u8c61\uff0c\u5c1d\u8bd5\u4f7f\u5b83\u53ef\u80fd\u4ecec-> querybuf\u8fb9\u754c\u5f00\u59cb\uff0c\u4ee5\u4fbf\u6211\u4eec\u53ef\u4ee5\u4f18\u5316\u5bf9\u8c61\u521b\u5efa\uff0c\u907f\u514d\u5927\u91cf\u7684\u6570\u636e\u526f\u672c\n                \/\/ \u4fdd\u5b58\u672a\u8bfb\u53d6\u7684\u90e8\u5206\n                sdsrange(c->querybuf,pos,-1);\n                \/\/ \u91cd\u7f6e\u504f\u79fb\u91cf\n                pos = 0;\n                \/\/ \u83b7\u53d6querybuf\u4e2d\u5df2\u4f7f\u7528\u7684\u957f\u5ea6\n                qblen = sdslen(c->querybuf);\n                \/* Hint the sds library about the amount of bytes this string is\n                 * going to contain. *\/\n                \/\/ \u6269\u5c55querybuf\u7684\u5927\u5c0f\n                if (qblen querybuf = sdsMakeRoomFor(c->querybuf,ll+2-qblen);\n            }\n            \/\/ \u4fdd\u5b58\u53c2\u6570\u7684\u957f\u5ea6\n            c->bulklen = ll;\n        }\n        \/* Read bulk argument *\/\n        \/\/ \u56e0\u4e3a\u53ea\u8bfb\u4e86multibulklen\u5b57\u8282\u7684\u6570\u636e\uff0c\u8bfb\u5230\u7684\u6570\u636e\u4e0d\u591f\uff0c\u5219\u76f4\u63a5\u8df3\u51fa\u5faa\u73af\uff0c\u6267\u884cprocessInputBuffer()\u51fd\u6570\u5faa\u73af\u8bfb\u53d6\n        if (sdslen(c->querybuf)-pos bulklen+2)) {\n            \/* Not enough data (+2 == trailing \\r\\n) *\/\n            break;\n        \/\/ \u4e3a\u53c2\u6570\u521b\u5efa\u4e86\u5bf9\u8c61\n        } else {\n            \/* Optimization: if the buffer contains JUST our bulk element\n             * instead of creating a new object by *copying* the sds we\n             * just use the current sds string. *\/\n            \/\/ \u5982\u679c\u8bfb\u5165\u7684\u957f\u5ea6\u5927\u4e8e32k\n            if (pos == 0 &&\n                c->bulklen >= PROTO_MBULK_BIG_ARG &&\n                (signed) sdslen(c->querybuf) == c->bulklen+2)\n            {\n                c->argv[c->argc++] = createObject(OBJ_STRING,c->querybuf);\n                \/\/ \u8df3\u8fc7\u6362\u884c\n                sdsIncrLen(c->querybuf,-2); \/* remove CRLF *\/\n                \/* Assume that if we saw a fat argument we'll see another one\n                 * likely... *\/\n                \/\/ \u8bbe\u7f6e\u4e00\u4e2a\u65b0\u957f\u5ea6\n                c->querybuf = sdsnewlen(NULL,c->bulklen+2);\n                sdsclear(c->querybuf);\n                pos = 0;\n            \/\/ \u521b\u5efa\u5bf9\u8c61\u4fdd\u5b58\u5728client\u7684\u53c2\u6570\u5217\u8868\u4e2d\n            } else {\n                c->argv[c->argc++] =\n                    createStringObject(c->querybuf+pos,c->bulklen);\n                pos += c->bulklen+2;\n            }\n            \/\/ \u6e05\u7a7a\u547d\u4ee4\u5185\u5bb9\u7684\u957f\u5ea6\n            c->bulklen = -1;\n            \/\/ \u672a\u8bfb\u53d6\u547d\u4ee4\u53c2\u6570\u7684\u6570\u91cf\uff0c\u8bfb\u53d6\u4e00\u4e2a\uff0c\u8be5\u503c\u51cf1\n            c->multibulklen--;\n        }\n    }\n    \/* Trim to pos *\/\n    \/\/ \u5220\u9664\u5df2\u7ecf\u8bfb\u53d6\u7684\uff0c\u4fdd\u7559\u672a\u8bfb\u53d6\u7684\n    if (pos) sdsrange(c->querybuf,pos,-1);\n    \/* We're done when c->multibulk == 0 *\/\n    \/\/ \u547d\u4ee4\u7684\u53c2\u6570\u5168\u90e8\u88ab\u8bfb\u53d6\u5b8c\n    if (c->multibulklen == 0) return C_OK;\n    \/* Still not read to process the command *\/\n    return C_ERR;\n}\n<\/pre>\n
      \u6211\u4eec\u7ed3\u5408\u4e00\u4e2a\u591a\u6761\u6279\u91cf\u56de\u590d\u8fdb\u884c\u5206\u6790\u3002\u4e00\u4e2a\u591a\u6761\u6279\u91cf\u56de\u590d\u4ee5 * \\r\\n <\/code>\u4e3a\u524d\u7f00\uff0c\u540e\u8ddf\u591a\u6761\u4e0d\u540c\u7684\u6279\u91cf\u56de\u590d\uff0c\u5176\u4e2d argc<\/code>\u4e3a\u8fd9\u4e9b\u6279\u91cf\u56de\u590d\u7684\u6570\u91cf. \u90a3\u4e48SET nmykey nmyvalue<\/code>\u547d\u4ee4\u8f6c\u6362\u4e3aRedis\u534f\u8bae\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n
      \"*3\\r\\n$3\\r\\nSET\\r\\n$5\\r\\nmykey\\r\\n$7\\r\\nmyvalue\\r\\n\"\n<\/pre>\n
      \u5f53\u8fdb\u5165processMultibulkBuffer()<\/code>\u51fd\u6570\u4e4b\u540e\uff0c\u5982\u679c\u662f\u7b2c\u4e00\u6b21\u6267\u884c\u8be5\u51fd\u6570\uff0c\u90a3\u4e48argv<\/code>\u4e2d\u672a\u8bfb\u53d6\u7684\u547d\u4ee4\u6570\u91cf\u4e3a0\uff0c\u4e5f\u5c31\u662f\u8bf4\u53c2\u6570\u5217\u8868\u4e3a\u7a7a\uff0c\u90a3\u4e48\u4f1a\u6267\u884cif (c->multibulklen == 0)<\/code>\u7684\u4ee3\u7801\uff0c\u8fd9\u91cc\u7684\u4ee3\u7801\u4f1a\u89e3\u6790*3\\r\\n<\/code>\uff0c\u5c063<\/code>\u4fdd\u5b58\u5230multibulklen<\/code>\u4e2d\uff0c\u8868\u793a\u540e\u9762\u7684\u53c2\u6570\u4e2a\u6570\uff0c\u7136\u540e\u6839\u636e\u53c2\u6570\u4e2a\u6570\uff0c\u4e3aargv<\/code>\u5206\u914d\u7a7a\u95f4.<\/p>\n
      \u63a5\u7740\uff0c\u6267\u884cmultibulklen<\/code>\u6b21while\u5faa\u73af\uff0c\u6bcf\u6b21\u8bfb\u4e00\u4e2a\u53c2\u6570\uff0c\u4f8b\u5982$3\\r\\nSET\\r\\n<\/code>\uff0c\u4e5f\u662f\u5148\u8bfb\u51fa\u53c2\u6570\u957f\u5ea6\uff0c\u4fdd\u5b58\u5728bulklen<\/code>\u4e2d\uff0c\u7136\u540e\u5c06\u53c2\u6570SET<\/code>\u4fdd\u5b58\u6784\u5efa\u6210\u5bf9\u8c61\u4fdd\u5b58\u5230\u53c2\u6570\u5217\u8868\u4e2d. \u6bcf\u6b21\u8bfb\u4e00\u4e2a\u53c2\u6570\uff0cmultibulklen<\/code>\u5c31\u4f1a\u51cf1\uff0c\u5f53\u7b49\u4e8e0\u65f6\uff0c\u5c31\u8868\u793a\u547d\u4ee4\u7684\u53c2\u6570\u5168\u90e8\u8bfb\u53d6\u5230\u53c2\u6570\u5217\u8868\u5b8c\u6bd5.<\/p>\n
      \u4e8e\u662f\u547d\u4ee4\u63a5\u6536\u7684\u6574\u4e2a\u8fc7\u7a0b\u5b8c\u6210.<\/p>\n
      3.2 \u547d\u4ee4\u56de\u590d<\/h4>\n
      \u547d\u4ee4\u56de\u590d\u7684\u51fd\u6570\uff0c\u4e5f\u662f\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u7684\u56de\u8c03\u51fd\u6570\u4e4b\u4e00. \u5f53\u670d\u52a1\u5668\u7684client\u7684\u56de\u590d\u7f13\u51b2\u533a\u6709\u6570\u636e\uff0c\u90a3\u4e48\u5c31\u4f1a\u8c03\u7528aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,sendReplyToClient, c)<\/code>\u51fd\u6570\uff0c\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/code>\u548cAE_WRITABLE<\/code>\u4e8b\u4ef6\u5173\u8054\u8d77\u6765\uff0c\u5f53\u5ba2\u6237\u7aef\u53ef\u5199\u65f6\uff0c\u5c31\u4f1a\u89e6\u53d1\u4e8b\u4ef6\uff0c\u8c03\u7528sendReplyToClient()<\/code>\u51fd\u6570\uff0c\u6267\u884c\u5199\u4e8b\u4ef6. \u6211\u4eec\u91cd\u70b9\u770b\u8fd9\u4e2a\u51fd\u6570\u7684\u4ee3\u7801\uff1a<\/p>\n
      \/\/ \u5199\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff0c\u53ea\u662f\u53d1\u9001\u56de\u590d\u7ed9client\nvoid sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {\n    UNUSED(el);\n    UNUSED(mask);\n    \/\/ \u53d1\u9001\u5b8c\u6570\u636e\u4f1a\u5220\u9664fd\u7684\u53ef\u8bfb\u4e8b\u4ef6\n    writeToClient(fd,privdata,1);\n}\n<\/pre>\n
      \u8fd9\u4e2a\u51fd\u6570\u76f4\u63a5\u8c03\u7528\u4e86writeToClient()<\/code>\u51fd\u6570\uff1a<\/p>\n
      \/\/ \u5c06\u8f93\u51fa\u7f13\u51b2\u533a\u7684\u6570\u636e\u5199\u7ed9client\uff0c\u5982\u679cclient\u88ab\u91ca\u653e\u5219\u8fd4\u56deC_ERR\uff0c\u6ca1\u88ab\u91ca\u653e\u5219\u8fd4\u56deC_OK\nint writeToClient(int fd, client *c, int handler_installed) {\n    ssize_t nwritten = 0, totwritten = 0;\n    size_t objlen;\n    size_t objmem;\n    robj *o;\n    \/\/ \u5982\u679c\u6307\u5b9a\u7684client\u7684\u56de\u590d\u7f13\u51b2\u533a\u4e2d\u8fd8\u6709\u6570\u636e\uff0c\u5219\u8fd4\u56de\u771f\uff0c\u8868\u793a\u53ef\u4ee5\u5199socket\n    while(clientHasPendingReplies(c)) {\n        \/\/ \u56fa\u5b9a\u7f13\u51b2\u533a\u53d1\u9001\u672a\u5b8c\u6210\n        if (c->bufpos > 0) {\n            \/\/ \u5c06\u7f13\u51b2\u533a\u7684\u6570\u636e\u5199\u5230fd\u4e2d\n            nwritten = write(fd,c->buf+c->sentlen,c->bufpos-c->sentlen);\n            \/\/ \u5199\u5931\u8d25\u8df3\u51fa\u5faa\u73af\n            if (nwritten sentlen += nwritten;\n            totwritten += nwritten;\n            \/\/ \u5982\u679c\u53d1\u9001\u7684\u6570\u636e\u7b49\u4e8ebuf\u7684\u504f\u79fb\u91cf\uff0c\u8868\u793a\u53d1\u9001\u5b8c\u6210\n            if ((int)c->sentlen == c->bufpos) {\n                \/\/ \u5219\u5c06\u5176\u91cd\u7f6e\n                c->bufpos = 0;\n                c->sentlen = 0;\n            }\n        \/\/ \u56fa\u5b9a\u7f13\u51b2\u533a\u53d1\u9001\u5b8c\u6210\uff0c\u53d1\u9001\u56de\u590d\u94fe\u8868\u7684\u5185\u5bb9\n        } else {\n            \/\/ \u56de\u590d\u94fe\u8868\u7684\u7b2c\u4e00\u6761\u56de\u590d\u5bf9\u8c61\uff0c\u548c\u5bf9\u8c61\u503c\u7684\u957f\u5ea6\u548c\u6240\u5360\u7684\u5185\u5b58\n            o = listNodeValue(listFirst(c->reply));\n            objlen = sdslen(o->ptr);\n            objmem = getStringObjectSdsUsedMemory(o);\n            \/\/ \u8df3\u8fc7\u7a7a\u5bf9\u8c61\uff0c\u5e76\u5220\u9664\u8fd9\u4e2a\u5bf9\u8c61\n            if (objlen == 0) {\n                listDelNode(c->reply,listFirst(c->reply));\n                c->reply_bytes -= objmem;\n                continue;\n            }\n            \/\/ \u5c06\u5f53\u524d\u8282\u70b9\u7684\u503c\u5199\u5230fd\u4e2d\n            nwritten = write(fd, ((char*)o->ptr)+c->sentlen,objlen-c->sentlen);\n            \/\/ \u5199\u5931\u8d25\u8df3\u51fa\u5faa\u73af\n            if (nwritten sentlen += nwritten;\n            totwritten += nwritten;\n            \/\/ \u53d1\u9001\u5b8c\u6210\uff0c\u5219\u5220\u9664\u8be5\u8282\u70b9\uff0c\u91cd\u7f6e\u53d1\u9001\u7684\u6570\u636e\u957f\u5ea6\uff0c\u66f4\u65b0\u56de\u590d\u94fe\u8868\u7684\u603b\u5b57\u8282\u6570\n            if (c->sentlen == objlen) {\n                listDelNode(c->reply,listFirst(c->reply));\n                c->sentlen = 0;\n                c->reply_bytes -= objmem;\n            }\n        }\n        \/\/ \u66f4\u65b0\u5199\u5230\u7f51\u7edc\u7684\u5b57\u8282\u6570\n        server.stat_net_output_bytes += totwritten;\n        \/\/ \u5982\u679c\u8fd9\u6b21\u5199\u7684\u603b\u91cf\u5927\u4e8eNET_MAX_WRITES_PER_EVENT\u7684\u9650\u5236\uff0c\u5219\u4f1a\u4e2d\u65ad\u672c\u6b21\u7684\u5199\u64cd\u4f5c\uff0c\u5c06\u5904\u7406\u65f6\u95f4\u8ba9\u7ed9\u5176\u4ed6\u7684client\uff0c\u4ee5\u514d\u4e00\u4e2a\u975e\u5e38\u7684\u56de\u590d\u72ec\u5360\u670d\u52a1\u5668\uff0c\u5269\u4f59\u7684\u6570\u636e\u4e0b\u6b21\u7ee7\u7eed\u5728\u5199\n        \/\/ \u4f46\u662f\uff0c\u5982\u679c\u5f53\u670d\u52a1\u5668\u7684\u5185\u5b58\u6570\u5df2\u7ecf\u8d85\u8fc7maxmemory\uff0c\u5373\u4f7f\u8d85\u8fc7\u6700\u5927\u5199NET_MAX_WRITES_PER_EVENT\u7684\u9650\u5236\uff0c\u4e5f\u4f1a\u7ee7\u7eed\u6267\u884c\u5199\u5165\u64cd\u4f5c\uff0c\u662f\u4e3a\u4e86\u5c3d\u5feb\u5199\u5165\u7ed9\u5ba2\u6237\u7aef\n        if (totwritten > NET_MAX_WRITES_PER_EVENT &&\n            (server.maxmemory == 0 ||\n             zmalloc_used_memory()  0) {\n        \/\/ \u5982\u679c\u4e0d\u662f\u4e3b\u8282\u70b9\u670d\u52a1\u5668\uff0c\u5219\u66f4\u65b0\u6700\u8fd1\u548c\u670d\u52a1\u5668\u4ea4\u4e92\u7684\u65f6\u95f4\n        if (!(c->flags & CLIENT_MASTER)) c->lastinteraction = server.unixtime;\n    }\n    \/\/ \u5982\u679c\u6307\u5b9a\u7684client\u7684\u56de\u590d\u7f13\u51b2\u533a\u4e2d\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\uff0c\u53d1\u9001\u5b8c\u6210\n    if (!clientHasPendingReplies(c)) {\n        c->sentlen = 0;\n        \/\/ \u5220\u9664\u5f53\u524dclient\u7684\u53ef\u8bfb\u4e8b\u4ef6\u7684\u76d1\u542c\n        if (handler_installed) aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);\n        \/* Close connection after entire reply has been sent. *\/\n        \/\/ \u5982\u679c\u6307\u5b9a\u4e86\u5199\u5165\u6309\u6210\u4e4b\u540e\u7acb\u5373\u5173\u95ed\u7684\u6807\u5fd7\uff0c\u5219\u91ca\u653eclient\n        if (c->flags & CLIENT_CLOSE_AFTER_REPLY) {\n            freeClient(c);\n            return C_ERR;\n        }\n    }\n    return C_OK;\n}\n<\/pre>\n
      \u8fd9\u4e2a\u51fd\u6570\u5b9e\u9645\u4e0a\u662f\u5bf9write()<\/code>\u51fd\u6570\u7684\u5c01\u88c5\uff0c\u5c06\u9759\u6001\u56de\u590d\u7f13\u51b2\u533abuf<\/code>\u6216\u56de\u590d\u94fe\u8868reply<\/code>\u4e2d\u7684\u6570\u636e\u5faa\u73af\u5199\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/code>\u4e2d. \u5982\u679c\u5199\u5b8c\u4e86\uff0c\u5219\u5c06\u5f53\u524d\u5ba2\u6237\u7aef\u7684AE_WRITABLE<\/code>\u4e8b\u4ef6\u5220\u9664.<\/p>\n
      4. CLIENT\u547d\u4ee4\u7684\u5b9e\u73b0<\/h3>\n
      CLIENT<\/code>\u76f8\u5173\u7684\u547d\u4ee4\u5927\u81f4\u67096\u6761\uff1a<\/p>\n
      CLIENT KILL [ip:port] [ID client-id] [TYPE normal|master|slave|pubsub] [ADDR ip:port] [SKIPME yes\/no] \nCLIENT GETNAME\nCLIENT LIST\nCLIENT PAUSE timeout \nCLIENT REPLY ON|OFF|SKIP \nCLIENT SETNAME connection-name \n<\/pre>\n
      \u4e0b\u9762\u662fclient<\/code>\u547d\u4ee4\u7684\u5b9e\u73b0\uff1a<\/p>\n
      \/\/ client \u547d\u4ee4\u7684\u5b9e\u73b0\nvoid clientCommand(client *c) {\n    listNode *ln;\n    listIter li;\n    client *client;\n    \/\/  CLIENT LIST \u7684\u5b9e\u73b0\n    if (!strcasecmp(c->argv[1]->ptr,\"list\") && c->argc == 2) {\n        \/* CLIENT LIST *\/\n        \/\/ \u83b7\u53d6\u6240\u6709\u7684client\u4fe1\u606f\n        sds o = getAllClientsInfoString();\n        \/\/ \u6dfb\u52a0\u5230\u5230\u8f93\u5165\u7f13\u51b2\u533a\u4e2d\n        addReplyBulkCBuffer(c,o,sdslen(o));\n        sdsfree(o);\n    \/\/ CLIENT REPLY ON|OFF|SKIP \u547d\u4ee4\u5b9e\u73b0\n    } else if (!strcasecmp(c->argv[1]->ptr,\"reply\") && c->argc == 3) {\n        \/* CLIENT REPLY ON|OFF|SKIP *\/\n        \/\/ \u5982\u679c\u662f ON\n        if (!strcasecmp(c->argv[2]->ptr,\"on\")) {\n            \/\/ \u53d6\u6d88 off \u548c skip \u7684\u6807\u5fd7\n            c->flags &= ~(CLIENT_REPLY_SKIP|CLIENT_REPLY_OFF);\n            \/\/ \u56de\u590d +OK\n            addReply(c,shared.ok);\n        \/\/ \u5982\u679c\u662f OFF\n        } else if (!strcasecmp(c->argv[2]->ptr,\"off\")) {\n            \/\/ \u6253\u5f00 OFF\u6807\u5fd7\n            c->flags |= CLIENT_REPLY_OFF;\n        \/\/ \u5982\u679c\u662f SKIP\n        } else if (!strcasecmp(c->argv[2]->ptr,\"skip\")) {\n            \/\/ \u6ca1\u6709\u8bbe\u7f6e OFF \u5219\u8bbe\u7f6e SKIP \u6807\u5fd7\n            if (!(c->flags & CLIENT_REPLY_OFF))\n                c->flags |= CLIENT_REPLY_SKIP_NEXT;\n        } else {\n            addReply(c,shared.syntaxerr);\n            return;\n        }\n    \/\/  CLIENT KILL [ip:port] [ID client-id] [TYPE normal | master | slave | pubsub] [ADDR ip:port] [SKIPME yes \/ no]\n    } else if (!strcasecmp(c->argv[1]->ptr,\"kill\")) {\n        \/* CLIENT KILL \n   \n    \n         * CLIENT KILL \n     [value] ... \n     [value] *\/ char *addr = NULL; int type = -1; uint64_t id = 0; int skipme = 1; int killed = 0, close_this_client = 0; \/\/ CLIENT KILL addr:port\u53ea\u80fd\u901a\u8fc7\u5730\u5740\u6740\u6b7bclient\uff0c\u65e7\u7248\u672c\u517c\u5bb9 if (c->argc == 3) { \/* Old style syntax: CLIENT KILL \n     \n       *\/ addr = c->argv[2]->ptr; skipme = 0; \/* With the old form, you can kill yourself. *\/ \/\/ \u65b0\u7248\u672c\u53ef\u4ee5\u6839\u636e[ID client-id] [master|normal|slave|pubsub] [ADDR ip:port] [SKIPME yes\/no]\u6740\u6b7bclient } else if (c->argc > 3) { int i = 2; \/* Next option index. *\/ \/* New style syntax: parse options. *\/ \/\/ \u89e3\u6790\u8bed\u6cd5 while(i argc) { int moreargs = c->argc > i+1; \/\/ CLIENT KILL [ID client-id] if (!strcasecmp(c->argv[i]->ptr,\"id\") && moreargs) { long long tmp; \/\/ \u83b7\u53d6client\u7684ID if (getLongLongFromObjectOrReply(c,c->argv[i+1],&tmp,NULL) != C_OK) return; id = tmp; \/\/ CLIENT KILL TYPE type, \u8fd9\u91cc\u7684 type \u53ef\u4ee5\u662f [master|normal|slave|pubsub] } else if (!strcasecmp(c->argv[i]->ptr,\"type\") && moreargs) { \/\/ \u83b7\u53d6client\u7684\u7c7b\u578b\uff0c[master|normal|slave|pubsub]\u56db\u79cd\u4e4b\u4e00 type = getClientTypeByName(c->argv[i+1]->ptr); if (type == -1) { addReplyErrorFormat(c,\"Unknown client type '%s'\", (char*) c->argv[i+1]->ptr); return; } \/\/ CLIENT KILL [ADDR ip:port] } else if (!strcasecmp(c->argv[i]->ptr,\"addr\") && moreargs) { \/\/ \u83b7\u53d6ip:port addr = c->argv[i+1]->ptr; \/\/ CLIENT KILL [SKIPME yes\/no] } else if (!strcasecmp(c->argv[i]->ptr,\"skipme\") && moreargs) { \/\/ \u5982\u679c\u662fyes\uff0c\u8bbe\u7f6e\u8bbe\u7f6eskipme\uff0c\u8c03\u7528\u8be5\u547d\u4ee4\u7684\u5ba2\u6237\u7aef\u5c06\u4e0d\u4f1a\u88ab\u6740\u6b7b if (!strcasecmp(c->argv[i+1]->ptr,\"yes\")) { skipme = 1; \/\/ \u8bbe\u7f6e\u4e3ano\u4f1a\u5f71\u54cd\u5230\u8fd8\u4f1a\u6740\u6b7b\u8c03\u7528\u8be5\u547d\u4ee4\u7684\u5ba2\u6237\u7aef\u3002 } else if (!strcasecmp(c->argv[i+1]->ptr,\"no\")) { skipme = 0; } else { addReply(c,shared.syntaxerr); return; } } else { addReply(c,shared.syntaxerr); return; } i += 2; } } else { addReply(c,shared.syntaxerr); return; } \/* Iterate clients killing all the matching clients. *\/ listRewind(server.clients,&li); \/\/ \u8fed\u4ee3\u6240\u6709\u7684client\u8282\u70b9 while ((ln = listNext(&li)) != NULL) { client = listNodeValue(ln); \/\/ \u6bd4\u8f83\u5f53\u524dclient\u548c\u8fd9\u56db\u7c7b\u4fe1\u606f\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u4e0d\u7b26\u5408\u5c31\u8df3\u8fc7\u672c\u5c42\u5faa\u73af\uff0c\u5426\u5219\u5c31\u6bd4\u8f83\u4e0b\u4e00\u4e2a\u4fe1\u606f if (addr && strcmp(getClientPeerId(client),addr) != 0) continue; if (type != -1 && getClientType(client) != type) continue; if (id != 0 && client->id != id) continue; if (c == client && skipme) continue; \/* Kill it. *\/ \/\/ \u6740\u6b7b\u5f53\u524d\u7684client if (c == client) { close_this_client = 1; } else { freeClient(client); } \/\/ \u8ba1\u7b97\u6740\u6b7bclient\u7684\u4e2a\u6570 killed++; } \/* Reply according to old\/new format. *\/ \/\/ \u56de\u590dclient\u4fe1\u606f if (c->argc == 3) { \/\/ \u6ca1\u627e\u5230\u7b26\u5408\u4fe1\u606f\u7684 if (killed == 0) addReplyError(c,\"No such client\"); else addReply(c,shared.ok); } else { \/\/ \u53d1\u9001\u6740\u6b7b\u7684\u4e2a\u6570 addReplyLongLong(c,killed); } \/* If this client has to be closed, flag it as CLOSE_AFTER_REPLY * only after we queued the reply to its output buffers. *\/ if (close_this_client) c->flags |= CLIENT_CLOSE_AFTER_REPLY; \/\/ CLIENT SETNAME connection-name } else if (!strcasecmp(c->argv[1]->ptr,\"setname\") && c->argc == 3) { int j, len = sdslen(c->argv[2]->ptr); char *p = c->argv[2]->ptr; \/* Setting the client name to an empty string actually removes * the current name. *\/ \/\/ \u8bbe\u7f6e\u540d\u5b57\u4e3a\u7a7a if (len == 0) { \/\/ \u5148\u91ca\u653e\u6389\u539f\u6765\u7684\u540d\u5b57 if (c->name) decrRefCount(c->name); c->name = NULL; addReply(c,shared.ok); return; } \/* Otherwise check if the charset is ok. We need to do this otherwise * CLIENT LIST format will break. You should always be able to * split by space to get the different fields. *\/ \/\/ \u68c0\u67e5\u540d\u5b57\u683c\u5f0f\u662f\u5426\u6b63\u786e for (j = 0; j '~') { \/* ASCII is assumed. *\/ addReplyError(c, \"Client names cannot contain spaces, \" \"newlines or special characters.\"); return; } } \/\/ \u91ca\u653e\u539f\u6765\u7684\u540d\u5b57 if (c->name) decrRefCount(c->name); \/\/ \u8bbe\u7f6e\u65b0\u540d\u5b57 c->name = c->argv[2]; incrRefCount(c->name); addReply(c,shared.ok); \/\/ CLIENT GETNAME } else if (!strcasecmp(c->argv[1]->ptr,\"getname\") && c->argc == 2) { \/\/ \u56de\u590d\u540d\u5b57 if (c->name) addReplyBulk(c,c->name); else addReply(c,shared.nullbulk); \/\/ CLIENT PAUSE timeout } else if (!strcasecmp(c->argv[1]->ptr,\"pause\") && c->argc == 3) { long long duration; \/\/ \u4ee5\u6beb\u79d2\u4e3a\u5355\u4f4d\u5c06\u7b49\u5f85\u65f6\u95f4\u4fdd\u5b58\u5728duration\u4e2d if (getTimeoutFromObjectOrReply(c,c->argv[2],&duration,UNIT_MILLISECONDS) != C_OK) return; \/\/ \u6682\u505cclient pauseClients(duration); addReply(c,shared.ok); } else { addReplyError(c, \"Syntax error, try CLIENT (LIST | KILL | GETNAME | SETNAME | PAUSE | REPLY)\"); } }\n     \n   <\/pre>\n","protected":false},"excerpt":{"rendered":"
      Redis\u6e90\u7801\u4e0e\u8bbe\u8ba1\u5256\u6790\u4e4b\u7f51\u7edc\u8fde...<\/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-201315","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201315","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=201315"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201315\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201315"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201315"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}