tsocket: add tstream_writev_queue_send/recv()

metze

1 files changed, 124 insertions, 0 deletions

diff --git a/lib/tsocket/tsocket_helpers.c b/lib/tsocket/tsocket_helpers.c
index 1b9a9bf670..99cb25b396 100644
--- a/lib/tsocket/tsocket_helpers.c
+++ b/lib/tsocket/tsocket_helpers.c
@@ -320,3 +320,127 @@ int tstream_readv_pdu_recv(struct tevent_req *req, int *perrno)
 	return ret;
 }
 
+struct tstream_writev_queue_state {
+	/* this structs are owned by the caller */
+	struct {
+		struct tevent_context *ev;
+		struct tstream_context *stream;
+		const struct iovec *vector;
+		size_t count;
+	} caller;
+	int ret;
+};
+
+static void tstream_writev_queue_trigger(struct tevent_req *req,
+					 void *private_data);
+static void tstream_writev_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 tevent_context to run on
+ * @param[in] stream	The stream to send data through
+ * @param[in] queue	The existing send queue
+ * @param[in] vector	The iovec vector so write
+ * @param[in] count	The size of the vector
+ * @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 *tstream_writev_queue_send(TALLOC_CTX *mem_ctx,
+					     struct tevent_context *ev,
+					     struct tstream_context *stream,
+					     struct tevent_queue *queue,
+					     const struct iovec *vector,
+					     size_t count)
+{
+	struct tevent_req *req;
+	struct tstream_writev_queue_state *state;
+	bool ok;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tstream_writev_queue_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->caller.ev	= ev;
+	state->caller.stream	= stream;
+	state->caller.vector	= vector;
+	state->caller.count	= count;
+	state->ret		= -1;
+
+	ok = tevent_queue_add(queue,
+			      ev,
+			      req,
+			      tstream_writev_queue_trigger,
+			      NULL);
+	if (!ok) {
+		tevent_req_nomem(NULL, req);
+		goto post;
+	}
+
+	return req;
+
+ post:
+	return tevent_req_post(req, ev);
+}
+
+static void tstream_writev_queue_trigger(struct tevent_req *req,
+					 void *private_data)
+{
+	struct tstream_writev_queue_state *state = tevent_req_data(req,
+					struct tstream_writev_queue_state);
+	struct tevent_req *subreq;
+
+	subreq = tstream_writev_send(state,
+				     state->caller.ev,
+				     state->caller.stream,
+				     state->caller.vector,
+				     state->caller.count);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, tstream_writev_queue_done ,req);
+}
+
+static void tstream_writev_queue_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	struct tstream_writev_queue_state *state = tevent_req_data(req,
+					struct tstream_writev_queue_state);
+	int ret;
+	int sys_errno;
+
+	ret = tstream_writev_recv(subreq, &sys_errno);
+	talloc_free(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+	state->ret = ret;
+
+	tevent_req_done(req);
+}
+
+int tstream_writev_queue_recv(struct tevent_req *req, int *perrno)
+{
+	struct tstream_writev_queue_state *state = tevent_req_data(req,
+					struct tstream_writev_queue_state);
+	int ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+	if (ret == 0) {
+		ret = state->ret;
+	}
+
+	tevent_req_received(req);
+	return ret;
+}
+