typedef struct redisClient {
uint64_t id; /* Client incremental unique ID. */
int fd;//套接字描述符，-1表示伪客户端（AOF文件载入、lua脚本）
redisDb *db;
int dictid;
robj *name; /* 名字，默认为空 */
sds querybuf; //用户保存客户端发送的命令请求
size_t querybuf_peak; /* Recent (100ms or more) peak of querybuf size */
int argc; //命令参数的个数
robj **argv; //命令参数
struct redisCommand *cmd, *lastcmd; //命令的实现函数
int reqtype;
int multibulklen; /* number of multi bulk arguments left to read */
long bulklen; /* length of bulk argument in multi bulk request */
unsigned long reply_bytes; /* Tot bytes of objects in reply list */
int sentlen; /* Amount of bytes already sent in the current
buffer or object being sent. */
time_t ctime; /*创建客户端的时间 */
time_t lastinteraction; /* 客户端与服务器最后一次进行互动的时间 */
time_t obuf_soft_limit_reached_time; //输出缓冲区第一次到达软性限制的时间
int flags; /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ...角色以及状态 */
int authenticated; /* 客户端是否通过了身份验证 */
int replstate; /* replication state if this is a slave */
int repl_put_online_on_ack; /* Install slave write handler on ACK. */
int repldbfd; /* replication DB file descriptor */
off_t repldboff; /* replication DB file offset */
off_t repldbsize; /* replication DB file size */
sds replpreamble; /* replication DB preamble. */
long long reploff; /* replication offset if this is our master */
long long repl_ack_off; /* replication ack offset, if this is a slave */
long long repl_ack_time;/* replication ack time, if this is a slave */
long long psync_initial_offset; /* FULLRESYNC reply offset other slaves
copying this slave output buffer
should use. */
char replrunid[REDIS_RUN_ID_SIZE+1]; /* master run id if this is a master */
int slave_listening_port; /* 从服务器的监听端口 */
int slave_capa; /* Slave capabilities: SLAVE_CAPA_* bitwise OR. */
multiState mstate; /* MULTI/EXEC state */
blockingState bpop; /* blocking state */
list *watched_keys; /* Keys WATCHED for MULTI/EXEC CAS */
dict *pubsub_channels; /* channels a client is interested in (SUBSCRIBE) */
list *pubsub_patterns; /* patterns a client is interested in (SUBSCRIBE) */
sds peerid; /* Cached peer ID. */
/*保存命令回复内容 */
list *reply; //可变大小缓冲区
int bufpos; //固定缓冲区，字节数组（默认16KB）
char buf[REDIS_REPLY_CHUNK_BYTES]; //已使用的字节数
} redisClient;
/* Client flags */
#define REDIS_SLAVE (1<<0) /* This client is a slave server */
#define REDIS_MASTER (1<<1) /* This client is a master server */
#define REDIS_MONITOR (1<<2) /* This client is a slave monitor, see MONITOR */
#define REDIS_MULTI (1<<3) /* This client is in a MULTI context */
#define REDIS_BLOCKED (1<<4) /* The client is waiting in a blocking operation */
#define REDIS_DIRTY_CAS (1<<5) /* Watched keys modified. EXEC will fail. */
#define REDIS_CLOSE_AFTER_REPLY (1<<6) /* Close after writing entire reply. */
#define REDIS_UNBLOCKED (1<<7) /* This client was unblocked and is stored in
server.unblocked_clients */
#define REDIS_LUA_CLIENT (1<<8) /* This is a non connected client used by Lua */
#define REDIS_ASKING (1<<9) /* Client issued the ASKING command */
#define REDIS_CLOSE_ASAP (1<<10)/* Close this client ASAP */
#define REDIS_UNIX_SOCKET (1<<11) /* Client connected via Unix domain socket */
#define REDIS_DIRTY_EXEC (1<<12) /* EXEC will fail for errors while queueing */
#define REDIS_MASTER_FORCE_REPLY (1<<13) /* Queue replies even if is master */
#define REDIS_FORCE_AOF (1<<14) /* Force AOF propagation of current cmd. */
#define REDIS_FORCE_REPL (1<<15) /* Force replication of current cmd. */
#define REDIS_PRE_PSYNC (1<<16) /* Instance don't understand PSYNC. */
#define REDIS_READONLY (1<<17) /* Cluster client is in read-only state. */
#define REDIS_PUBSUB (1<<18) /* Client is in Pub/Sub mode. */
