Function unblockClientFromModule

app/redis-6.2.6/src/module.c:5226–5261

This is called from blocked.c in order to unblock a client: may be called * for multiple reasons while the client is in the middle of being blocked * because the client is terminated, but is also called for cleanup when a * client is unblocked in a clean way after replaying. * * What we do here is just to set the client to NULL in the redis module * blocked client handle. This way if the cli

 * The structure RedisModuleBlockedClient will be always deallocated when
 * running the list of clients blocked by a module that need to be unblocked. */
void unblockClientFromModule(client *c) {
    RedisModuleBlockedClient *bc = c->bpop.module_blocked_handle;

    /* Call the disconnection callback if any. Note that
     * bc->disconnect_callback is set to NULL if the client gets disconnected
     * by the module itself or because of a timeout, so the callback will NOT
     * get called if this is not an actual disconnection event. */
    if (bc->disconnect_callback) {
        RedisModuleCtx ctx = REDISMODULE_CTX_INIT;
        ctx.blocked_privdata = bc->privdata;
        ctx.module = bc->module;
        ctx.client = bc->client;
        bc->disconnect_callback(&ctx,bc);
        moduleFreeContext(&ctx);
    }

    /* If we made it here and client is still blocked it means that the command
     * timed-out, client was killed or disconnected and disconnect_callback was
     * not implemented (or it was, but RM_UnblockClient was not called from
     * within it, as it should).
     * We must call moduleUnblockClient in order to free privdata and
     * RedisModuleBlockedClient.
     *
     * Note that we only do that for clients that are blocked on keys, for which
     * the contract is that the module should not call RM_UnblockClient under
     * normal circumstances.
     * Clients implementing threads and working with private data should be
     * aware that calling RM_UnblockClient for every blocked client is their
     * responsibility, and if they fail to do so memory may leak. Ideally they
     * should implement the disconnect and timeout callbacks and call
     * RM_UnblockClient, but any other way is also acceptable. */
    if (bc->blocked_on_keys && !bc->unblocked)
        moduleUnblockClient(c);

    bc->client = NULL;
}

/* Block a client in the context of a module: this function implements both
 * RM_BlockClient() and RM_BlockClientOnKeys() depending on the fact the