聊聊 Redis 集群 Gosisp 协议与节点通信

union clusterMsgData {
    /* PING, MEET and PONG */
    struct {
        /* Array of N clusterMsgDataGossip structures */
        clusterMsgDataGossip gossip[1];
        /* Extension data that can optionally be sent for ping/meet/pong
         * messages. We can't explicitly define them here though, since
         * the gossip array isn't the real length of the gossip data. */
    } ping;

    /* FAIL */
    struct {
        clusterMsgDataFail about;
    } fail;

    /* PUBLISH */
    struct {
        clusterMsgDataPublish msg;
    } publish;

    /* UPDATE */
    struct {
        clusterMsgDataUpdate nodecfg;
    } update;

    /* MODULE */
    struct {
        clusterMsgModule msg;
    } module;
};

typedef struct {
    char nodename[CLUSTER_NAMELEN];
    uint32_t ping_sent;
    uint32_t pong_received;
    char ip[NET_IP_STR_LEN];  /* IP address last time it was seen */
    uint16_t port;              /* base port last time it was seen */
    uint16_t cport;             /* cluster port last time it was seen */
    uint16_t flags;             /* node->flags copy */
    uint16_t pport;             /* plaintext-port, when base port is TLS */
    uint16_t notused1;
} clusterMsgDataGossip;