mirror of https://github.com/grpc/grpc-node.git
113 lines
3.0 KiB
JavaScript
113 lines
3.0 KiB
JavaScript
/*
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*
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* Copyright 2023 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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const grpc = require('@grpc/grpc-js');
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const protoLoader = require('@grpc/proto-loader');
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const parseArgs = require('minimist');
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const PROTO_PATH = __dirname + '/../protos/echo.proto';
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const packageDefinition = protoLoader.loadSync(
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PROTO_PATH,
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{keepCase: true,
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longs: String,
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enums: String,
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defaults: true,
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oneofs: true
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});
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const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo;
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const PROPAGATE_PREFIX = '[propagate me]';
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let client;
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function unaryEcho(call, callback) {
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const message = call.request.message;
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if (message.startsWith(PROPAGATE_PREFIX)) {
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setTimeout(() => {
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client.unaryEcho({message: message.slice(PROPAGATE_PREFIX.length)}, {parent: call}, callback);
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}, 800);
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return;
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} else if (message === 'delay') {
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setTimeout(() => {
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callback(null, call.request);
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}, 1500);
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} else {
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callback(null, call.request);
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}
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}
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function bidirectionalStreamingEcho(call) {
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let lastMessage = null;
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call.on('data', value => {
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const message = value.message;
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lastMessage = message;
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call.pause();
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if (message.startsWith(PROPAGATE_PREFIX)) {
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setTimeout(() => {
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client.unaryEcho({message: message.slice(PROPAGATE_PREFIX.length)}, {parent: call}, (error, response) => {
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call.resume();
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if (error) {
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call.emit(error);
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return;
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}
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call.write(response);
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});
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}, 800);
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return;
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} else if (message === 'delay') {
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setTimeout(() => {
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call.write(value);
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call.resume();
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}, 1500);
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} else {
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call.write(value);
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call.resume();
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}
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});
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call.on('end', () => {
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if (lastMessage === null) {
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call.emit('error', {code: grpc.status.INVALID_ARGUMENT, details: 'request message not received'});
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}
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call.end();
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});
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}
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const serviceImplementation = {
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unaryEcho,
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bidirectionalStreamingEcho
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}
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function main() {
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const argv = parseArgs(process.argv.slice(2), {
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string: 'port',
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default: {port: '50052'}
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});
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const server = new grpc.Server();
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server.addService(echoProto.Echo.service, serviceImplementation);
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server.bindAsync(`0.0.0.0:${argv.port}`, grpc.ServerCredentials.createInsecure(), (err, port) => {
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if (err != null) {
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return console.error(err);
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}
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console.log(`gRPC listening on ${port}`)
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});
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client = new echoProto.Echo(`localhost:${argv.port}`, grpc.credentials.createInsecure());
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}
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main();
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