Function clusterSendModuleMessageToTarget

app/redis-6.2.6/src/cluster.c:2818–2829

This function gets a cluster node ID string as target, the same way the nodes * addresses are represented in the modules side, resolves the node, and sends * the message. If the target is NULL the message is broadcasted. * * The function returns C_OK if the target is valid, otherwise C_ERR is * returned. */

 * The function returns C_OK if the target is valid, otherwise C_ERR is
 * returned. */
int clusterSendModuleMessageToTarget(const char *target, uint64_t module_id, uint8_t type, unsigned char *payload, uint32_t len) {
    clusterNode *node = NULL;

    if (target != NULL) {
        node = clusterLookupNode(target);
        if (node == NULL || node->link == NULL) return C_ERR;
    }

    clusterSendModule(target ? node->link : NULL,
                      module_id, type, payload, len);
    return C_OK;
}

/* -----------------------------------------------------------------------------
 * CLUSTER Pub/Sub support