Redis 源码之常用数据结构和函数

typedef struct redisObject {    unsigned type:4;    unsigned encoding:4;    unsigned lru:LRU_BITS; /* lru time (relative to server.lruclock) */    int refcount;    void *ptr;} robj;

#define OBJ_STRING 0#define OBJ_LIST 1#define OBJ_SET 2#define OBJ_ZSET 3#define OBJ_HASH 4


void typeCommand(client *c) {
    robj *o;
    char *type;

    o = lookupKeyReadWithFlags(c->db,c->argv[1],LOOKUP_NOTOUCH);
    if (o == NULL) {
        type = "none";
    } else {
        switch(o->type) {
        case OBJ_STRING: type = "string"; break;
        case OBJ_LIST: type = "list"; break;
        case OBJ_SET: type = "set"; break;
        case OBJ_ZSET: type = "zset"; break;
        case OBJ_HASH: type = "hash"; break;
        default: type = "unknown"; break;
        }
    }
    addReplyStatus(c,type);
}

int isObjectRepresentableAsLongLong(robj *o, long long *llval) {    serverAssertWithInfo(NULL,o,o->type == OBJ_STRING);    if (o->encoding == OBJ_ENCODING_INT) {        if (llval) *llval = (long) o->ptr;        return C_OK;    } else {        return string2ll(o->ptr,sdslen(o->ptr),llval) ? C_OK : C_ERR;    }}

typedef struct client {
    uint64_t id;            /* Client incremental unique ID. */
    int fd;                 /* Client socket. */
    redisDb *db;            /* Pointer to currently SELECTed DB. */
    int dictid;             /* ID of the currently SELECTed DB. */
    robj *name;             /* As set by CLIENT SETNAME. */
    sds querybuf;           /* Buffer we use to accumulate client queries. */
    size_t querybuf_peak;   /* Recent (100ms or more) peak of querybuf size. */
    int argc;               /* Num of arguments of current command. */
    robj **argv;            /* Arguments of current command. */
    struct redisCommand *cmd, *lastcmd;  /* Last command executed. */
    int reqtype;            /* Request protocol type: PROTO_REQ_* */
    int multibulklen;       /* Number of multi bulk arguments left to read. */
    long bulklen;           /* Length of bulk argument in multi bulk request. */
    list *reply;            /* List of reply objects to send to the client. */
    unsigned long long reply_bytes; /* Tot bytes of objects in reply list. */
    size_t sentlen;         /* Amount of bytes already sent in the current
                               buffer or object being sent. */
    time_t ctime;           /* Client creation time. */
    time_t lastinteraction; /* Time of the last interaction, used for timeout */
    time_t obuf_soft_limit_reached_time;
    int flags;              /* Client flags: CLIENT_* macros. */
    int authenticated;      /* When requirepass is non-NULL. */
    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[CONFIG_RUN_ID_SIZE+1]; /* Master run id if is a master. */
    int slave_listening_port; /* As configured with: REPLCONF listening-port */
    char slave_ip[NET_IP_STR_LEN]; /* Optionally given by REPLCONF ip-address */
    int slave_capa;         /* Slave capabilities: SLAVE_CAPA_* bitwise OR. */
    multiState mstate;      /* MULTI/EXEC state */
    int btype;              /* Type of blocking op if CLIENT_BLOCKED. */
    blockingState bpop;     /* blocking state */
    long long woff;         /* Last write global replication offset. */
    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. */

    /* Response buffer */
    int bufpos;
    char buf[PROTO_REPLY_CHUNK_BYTES];
} client;

addReplyError(c,"increxpire command maxNum param must bigger or equal than 0");

addReply(c,shared.colon);addReply(c, o);addReply(c,shared.crlf);