Function processCommandAndResetClient

src/networking.cpp:2512–2534

This function calls processCommand(), but also performs a few sub tasks * for the client that are useful in that context: * * 1. It sets the current client to the client 'c'. * 2. calls commandProcessed() if the command was handled. * * The function returns C_ERR in case the client was freed as a side effect * of processing the command, otherwise C_OK is returned. */

 * The function returns C_ERR in case the client was freed as a side effect
 * of processing the command, otherwise C_OK is returned. */
int processCommandAndResetClient(client *c, int flags) {
    int deadclient = 0;
    client *old_client = serverTL->current_client;
    serverTL->current_client = c;
    serverAssert((flags & CMD_CALL_ASYNC) || GlobalLocksAcquired());
    
    if (processCommand(c, flags) == C_OK) {
        commandProcessed(c, flags);
    }
    if (serverTL->current_client == NULL) deadclient = 1;
    /*
     * Restore the old client, this is needed because when a script
     * times out, we will get into this code from processEventsWhileBlocked.
     * Which will cause to set the server.current_client. If not restored
     * we will return 1 to our caller which will falsely indicate the client
     * is dead and will stop reading from its buffer.
     */
    serverTL->current_client = old_client;
    /* performEvictions may flush slave output buffers. This may
     * result in a replica, that may be the active client, to be
     * freed. */
    return deadclient ? C_ERR : C_OK;
}

/* This function will execute any fully parsed commands pending on
 * the client. Returns C_ERR if the client is no longer valid after executing