漫话Redis源码之一百二十二

在看redis源码时，心中要时刻有rediscontext这个结构体，你可以看到，这个context几乎到处都有，其后的注释是比较明确的：

typedef struct _client {
    redisContext *context;
    sds obuf;
    char **randptr;         /* Pointers to :rand: strings inside the command buf */
    size_t randlen;         /* Number of pointers in client->randptr */
    size_t randfree;        /* Number of unused pointers in client->randptr */
    char **stagptr;         /* Pointers to slot hashtags (cluster mode only) */
    size_t staglen;         /* Number of pointers in client->stagptr */
    size_t stagfree;        /* Number of unused pointers in client->stagptr */
    size_t written;         /* Bytes of 'obuf' already written */
    long long start;        /* Start time of a request */
    long long latency;      /* Request latency */
    int pending;            /* Number of pending requests (replies to consume) */
    int prefix_pending;     /* If non-zero, number of pending prefix commands. Commands
                               such as auth and select are prefixed to the pipeline of
                               benchmark commands and discarded after the first send. */
    int prefixlen;          /* Size in bytes of the pending prefix commands */
    int thread_id;
    struct clusterNode *cluster_node;
    int slots_last_update;
} *client;

看多了，就自然眼熟了，也不要求死记硬背。