tsocket: add tdgram_sendto_queue_send/recv()
[ira/wip.git] / lib / tsocket / tsocket.c
index 922429a1c1cf2c6fb6b0d442a6cb66b95b231382..a8f3a3909b5d6797ea54713e52322d71e7e98638 100644 (file)
@@ -493,3 +493,133 @@ int tdgram_disconnect_recv(struct tevent_req *req,
        return ret;
 }
 
+struct tdgram_sendto_queue_state {
+       /* this structs are owned by the caller */
+       struct {
+               struct tevent_context *ev;
+               struct tdgram_context *dgram;
+               const uint8_t *buf;
+               size_t len;
+               const struct tsocket_address *dst;
+       } caller;
+       ssize_t ret;
+};
+
+static void tdgram_sendto_queue_trigger(struct tevent_req *req,
+                                        void *private_data);
+static void tdgram_sendto_queue_done(struct tevent_req *subreq);
+
+/**
+ * @brief Queue a dgram blob for sending through the socket
+ * @param[in] mem_ctx  The memory context for the result
+ * @param[in] ev       The event context the operation should work on
+ * @param[in] dgram    The tdgram_context to send the message buffer
+ * @param[in] queue    The existing dgram queue
+ * @param[in] buf      The message buffer
+ * @param[in] len      The message length
+ * @param[in] dst      The destination socket address
+ * @retval             The async request handle
+ *
+ * This function queues a blob for sending to destination through an existing
+ * dgram socket. The async callback is triggered when the whole blob is
+ * delivered to the underlying system socket.
+ *
+ * The caller needs to make sure that all non-scalar input parameters hang
+ * arround for the whole lifetime of the request.
+ */
+struct tevent_req *tdgram_sendto_queue_send(TALLOC_CTX *mem_ctx,
+                                           struct tevent_context *ev,
+                                           struct tdgram_context *dgram,
+                                           struct tevent_queue *queue,
+                                           const uint8_t *buf,
+                                           size_t len,
+                                           struct tsocket_address *dst)
+{
+       struct tevent_req *req;
+       struct tdgram_sendto_queue_state *state;
+       bool ok;
+
+       req = tevent_req_create(mem_ctx, &state,
+                               struct tdgram_sendto_queue_state);
+       if (!req) {
+               return NULL;
+       }
+
+       state->caller.ev        = ev;
+       state->caller.dgram     = dgram;
+       state->caller.buf       = buf;
+       state->caller.len       = len;
+       state->caller.dst       = dst;
+       state->ret              = -1;
+
+       ok = tevent_queue_add(queue,
+                             ev,
+                             req,
+                             tdgram_sendto_queue_trigger,
+                             NULL);
+       if (!ok) {
+               tevent_req_nomem(NULL, req);
+               goto post;
+       }
+
+       return req;
+
+ post:
+       tevent_req_post(req, ev);
+       return req;
+}
+
+static void tdgram_sendto_queue_trigger(struct tevent_req *req,
+                                        void *private_data)
+{
+       struct tdgram_sendto_queue_state *state = tevent_req_data(req,
+                                       struct tdgram_sendto_queue_state);
+       struct tevent_req *subreq;
+
+       subreq = tdgram_sendto_send(state,
+                                   state->caller.ev,
+                                   state->caller.dgram,
+                                   state->caller.buf,
+                                   state->caller.len,
+                                   state->caller.dst);
+       if (tevent_req_nomem(subreq, req)) {
+               return;
+       }
+       tevent_req_set_callback(subreq, tdgram_sendto_queue_done, req);
+}
+
+static void tdgram_sendto_queue_done(struct tevent_req *subreq)
+{
+       struct tevent_req *req = tevent_req_callback_data(subreq,
+                                struct tevent_req);
+       struct tdgram_sendto_queue_state *state = tevent_req_data(req,
+                                       struct tdgram_sendto_queue_state);
+       ssize_t ret;
+       int sys_errno;
+
+       ret = tdgram_sendto_recv(subreq, &sys_errno);
+       talloc_free(subreq);
+       if (ret == -1) {
+               tevent_req_error(req, sys_errno);
+               return;
+       }
+       state->ret = ret;
+
+       tevent_req_done(req);
+}
+
+ssize_t tdgram_sendto_queue_recv(struct tevent_req *req, int *perrno)
+{
+       struct tdgram_sendto_queue_state *state = tevent_req_data(req,
+                                       struct tdgram_sendto_queue_state);
+       ssize_t ret;
+
+       ret = tsocket_simple_int_recv(req, perrno);
+       if (ret == 0) {
+               ret = state->ret;
+       }
+
+       tevent_req_received(req);
+       return ret;
+}
+