grpc-node/examples/metadata/client.js

263 lines
8.4 KiB
JavaScript

/*
*
* Copyright 2023 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');
const parseArgs = require('minimist');
const PROTO_PATH = __dirname + '/../protos/echo.proto';
const packageDefinition = protoLoader.loadSync(
PROTO_PATH,
{keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true
});
const echoProto = grpc.loadPackageDefinition(packageDefinition).grpc.examples.echo;
const STREAMING_COUNT = 10;
function unaryCallWithMetadata(client, message) {
return new Promise((resolve, reject) => {
console.log('--- unary ---');
const requestMetadata = new grpc.Metadata();
requestMetadata.set('timestamp', new Date().toISOString());
const call = client.unaryEcho({message}, requestMetadata, (error, value) => {
if (error) {
console.log(`Received error ${error}`);
return;
}
console.log('Response:');
console.log(`- ${JSON.stringify(value)}`);
});
call.on('metadata', metadata => {
const timestamps = metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from header:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in header");
}
const locations = metadata.get('location');
if (locations.length > 0) {
console.log('location from header:');
for (const [index, value] of locations.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("location expected but doesn't exist in header");
}
});
call.on('status', status => {
const timestamps = status.metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from trailer:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in trailer");
}
resolve();
});
});
}
function serverStreamingWithMetadata(client, message) {
return new Promise((resolve, reject) => {
console.log('--- server streaming ---');
const requestMetadata = new grpc.Metadata();
requestMetadata.set('timestamp', new Date().toISOString());
const call = client.serverStreamingEcho({message}, requestMetadata);
call.on('metadata', metadata => {
const timestamps = metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from header:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in header");
}
const locations = metadata.get('location');
if (locations.length > 0) {
console.log('location from header:');
for (const [index, value] of locations.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("location expected but doesn't exist in header");
}
});
call.on('data', value => {
console.log(`Received response ${JSON.stringify(value)}`);
});
call.on('status', status => {
const timestamps = status.metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from trailer:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in trailer");
}
resolve();
});
call.on('error', error => {
console.log(`Received error ${error}`);
});
});
}
function clientStreamingWithMetadata(client, message) {
return new Promise((resolve, reject) => {
console.log('--- client streaming ---');
const requestMetadata = new grpc.Metadata();
requestMetadata.set('timestamp', new Date().toISOString());
const call = client.clientStreamingEcho(requestMetadata, (error, value) => {
if (error) {
console.log(`Received error ${error}`);
return;
}
console.log('Response:');
console.log(`- ${JSON.stringify(value)}`);
});
call.on('metadata', metadata => {
const timestamps = metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from header:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in header");
}
const locations = metadata.get('location');
if (locations.length > 0) {
console.log('location from header:');
for (const [index, value] of locations.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("location expected but doesn't exist in header");
}
});
call.on('status', status => {
const timestamps = status.metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from trailer:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in trailer");
}
resolve();
});
for (let i = 0; i < STREAMING_COUNT; i++) {
call.write({message});
}
call.end();
});
}
function bidirectionalWithMetadata(client, message) {
return new Promise((resolve, reject) => {
console.log('--- bidirectional ---');
const requestMetadata = new grpc.Metadata();
requestMetadata.set('timestamp', new Date().toISOString());
const call = client.bidirectionalStreamingEcho(requestMetadata);
call.on('metadata', metadata => {
const timestamps = metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from header:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in header");
}
const locations = metadata.get('location');
if (locations.length > 0) {
console.log('location from header:');
for (const [index, value] of locations.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("location expected but doesn't exist in header");
}
});
call.on('data', value => {
console.log(`Received response ${JSON.stringify(value)}`);
});
call.on('status', status => {
const timestamps = status.metadata.get('timestamp');
if (timestamps.length > 0) {
console.log('timestamp from trailer:');
for (const [index, value] of timestamps.entries()) {
console.log(` ${index}. ${value}`);
}
} else {
console.error("timestamp expected but doesn't exist in trailer");
}
resolve();
});
call.on('error', error => {
console.log(`Received error ${error}`);
});
for (let i = 0; i < STREAMING_COUNT; i++) {
call.write({message});
}
call.end();
});
}
function asyncWait(ms) {
return new Promise((resolve, reject) => {
setTimeout(resolve, ms);
});
}
const message = 'this is examples/metadata';
async function main() {
let argv = parseArgs(process.argv.slice(2), {
string: 'target',
default: {target: 'localhost:50052'}
});
const client = new echoProto.Echo(argv.target, grpc.credentials.createInsecure());
await unaryCallWithMetadata(client, message);
await asyncWait(1000);
await serverStreamingWithMetadata(client, message);
await asyncWait(1000);
await clientStreamingWithMetadata(client, message);
await asyncWait(1000);
await bidirectionalWithMetadata(client, message);
client.close();
}
main();