mirror of
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90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
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/*
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*
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* Copyright 2016 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include <grpc/grpc.h>
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#include <node.h>
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#include <uv.h>
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#include <v8.h>
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#include "call.h"
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#include "completion_queue.h"
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namespace grpc {
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namespace node {
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using v8::Local;
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using v8::Object;
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using v8::Value;
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grpc_completion_queue *queue;
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uv_prepare_t prepare;
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int pending_batches;
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static void drain_completion_queue(uv_prepare_t *handle) {
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Nan::HandleScope scope;
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grpc_event event;
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(void)handle;
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do {
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event = grpc_completion_queue_next(queue, gpr_inf_past(GPR_CLOCK_MONOTONIC),
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NULL);
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if (event.type == GRPC_OP_COMPLETE) {
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const char *error_message;
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if (event.success) {
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error_message = NULL;
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} else {
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error_message = "The async function encountered an error";
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}
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CompleteTag(event.tag, error_message);
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grpc::node::DestroyTag(event.tag);
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pending_batches--;
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}
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if (pending_batches == 0) {
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uv_prepare_stop(&prepare);
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}
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} while (event.type != GRPC_QUEUE_TIMEOUT);
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}
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grpc_completion_queue *GetCompletionQueue() { return queue; }
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void CompletionQueueNext() {
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if (pending_batches == 0) {
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uv_prepare_start(&prepare, drain_completion_queue);
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}
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pending_batches++;
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}
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void CompletionQueueInit(Local<Object> exports) {
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queue = grpc_completion_queue_create_for_next(NULL);
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uv_prepare_init(uv_default_loop(), &prepare);
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pending_batches = 0;
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}
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void CompletionQueueForcePoll() {
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/* This sets the prepare object to poll on the completion queue the next time
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* Node polls for IO. But it doesn't increment the number of pending batches,
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* so it will immediately stop polling after that unless there is an
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* intervening CompletionQueueNext call */
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if (pending_batches == 0) {
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uv_prepare_start(&prepare, drain_completion_queue);
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}
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}
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} // namespace node
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} // namespace grpc
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