mirror of https://github.com/grpc/grpc-dart.git
85 lines
2.5 KiB
Dart
85 lines
2.5 KiB
Dart
// Copyright (c) 2017, the gRPC project authors. Please see the AUTHORS file
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// for details. All rights reserved.
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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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import 'dart:async';
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import 'package:grpc/grpc.dart' as grpc;
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import 'generated/metadata.pbgrpc.dart';
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class MetadataService extends MetadataServiceBase {
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int callCount = 0;
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@override
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Future<Record> echo(grpc.ServiceCall call, Record request) async {
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final peer = call.clientMetadata['peer'];
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final count = callCount++;
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print('Echo: Call #$count: Peer: $peer, request: ${request.value}');
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call.headers['count'] = '${count}';
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call.trailers['hello'] = request.value;
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final delay = call.clientMetadata['delay'];
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if (delay != null) {
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await new Future.delayed(new Duration(seconds: int.parse(delay)));
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}
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return new Record()..value = peer;
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}
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@override
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Stream<Number> addOne(grpc.ServiceCall call, Stream<Number> request) async* {
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int lastNumber = -1;
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try {
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await for (var number in request) {
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lastNumber = number.value;
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yield new Number()..value = number.value + 1;
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}
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} catch (error) {
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print('Caught: $error, last number = $lastNumber');
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} finally {
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if (call.isCanceled) {
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print('AddOne: Call canceled');
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}
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}
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}
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/// Streams a Fibonacci number every 500ms until the call is canceled.
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Stream<Number> fibonacci(grpc.ServiceCall call, Empty request) async* {
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int previous = 0;
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int current = 1;
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try {
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while (true) {
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await new Future.delayed(new Duration(milliseconds: 500));
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yield new Number()..value = current;
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final next = current + previous;
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previous = current;
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current = next;
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}
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} finally {
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if (call.isCanceled) {
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print('Fibonacci: Canceled.');
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}
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}
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}
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}
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class Server {
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Future<void> main(List<String> args) async {
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final server = new grpc.Server([new MetadataService()]);
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await server.serve(port: 8080);
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print('Server listening on port ${server.port}...');
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}
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}
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