Function freeClient

app/redis-6.2.6/src/networking.c:1305–1442

}

void freeClient(client *c) {
    listNode *ln;

    /* If a client is protected, yet we need to free it right now, make sure
     * to at least use asynchronous freeing. */
    if (c->flags & CLIENT_PROTECTED) {
        freeClientAsync(c);
        return;
    }

    /* For connected clients, call the disconnection event of modules hooks. */
    if (c->conn) {
        moduleFireServerEvent(REDISMODULE_EVENT_CLIENT_CHANGE,
                              REDISMODULE_SUBEVENT_CLIENT_CHANGE_DISCONNECTED,
                              c);
    }

    /* Notify module system that this client auth status changed. */
    moduleNotifyUserChanged(c);

    /* If this client was scheduled for async freeing we need to remove it
     * from the queue. Note that we need to do this here, because later
     * we may call replicationCacheMaster() and the client should already
     * be removed from the list of clients to free. */
    if (c->flags & CLIENT_CLOSE_ASAP) {
        ln = listSearchKey(server.clients_to_close,c);
        serverAssert(ln != NULL);
        listDelNode(server.clients_to_close,ln);
    }

    /* If it is our master that's being disconnected we should make sure
     * to cache the state to try a partial resynchronization later.
     *
     * Note that before doing this we make sure that the client is not in
     * some unexpected state, by checking its flags. */
    if (server.master && c->flags & CLIENT_MASTER) {
        serverLog(LL_WARNING,"Connection with master lost.");
        if (!(c->flags & (CLIENT_PROTOCOL_ERROR|CLIENT_BLOCKED))) {
            c->flags &= ~(CLIENT_CLOSE_ASAP|CLIENT_CLOSE_AFTER_REPLY);
            replicationCacheMaster(c);
            return;
        }
    }

    /* Log link disconnection with slave */
    if (getClientType(c) == CLIENT_TYPE_SLAVE) {
        serverLog(LL_WARNING,"Connection with replica %s lost.",
            replicationGetSlaveName(c));
    }

    /* Free the query buffer */
    sdsfree(c->querybuf);
    sdsfree(c->pending_querybuf);
    c->querybuf = NULL;

    /* Deallocate structures used to block on blocking ops. */
    if (c->flags & CLIENT_BLOCKED) unblockClient(c);
    dictRelease(c->bpop.keys);