mirror of https://github.com/grpc/grpc-node.git
76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
/*
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*
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* Copyright 2025 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 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 addressString = 'ipv4:///127.0.0.1:50051,127.0.0.1:50052';
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function callUnaryEcho(client, message) {
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return new Promise((resolve, reject) => {
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const deadline = new Date();
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deadline.setSeconds(deadline.getSeconds() + 1);
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client.unaryEcho({message}, {deadline}, (error, response) => {
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if (error) {
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reject(error);
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} else {
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console.log(response.message);
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resolve(response);
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}
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});
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});
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}
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async function makeRPCs(client, count) {
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for (let i = 0; i < count; i++) {
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await callUnaryEcho(client, "this is examples/load_balancing");
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}
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}
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async function main() {
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// "pick_first" is the default, so there's no need to set the load balancing policy.
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const pickFirstClient = new echoProto.Echo(addressString, grpc.credentials.createInsecure());
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console.log("--- calling helloworld.Greeter/SayHello with pick_first ---");
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await makeRPCs(pickFirstClient, 10);
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console.log();
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const roundRobinServiceConfig = {
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methodConfig: [],
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loadBalancingConfig: [{ round_robin: {} }]
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};
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const roundRobinClient = new echoProto.Echo(addressString, grpc.credentials.createInsecure(), {'grpc.service_config': JSON.stringify(roundRobinServiceConfig)});
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console.log("--- calling helloworld.Greeter/SayHello with round_robin ---");
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await makeRPCs(roundRobinClient, 10);
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pickFirstClient.close();
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roundRobinClient.close();
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}
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main();
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