HowTo/gRPC/Linux/Node/Node 18 LTS/Server/express-grpc/app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;


/**
 **************************** gRPC Server *************************
 */

var PROTO_PATH = __dirname + '/protos/helloworld.proto';


var grpc = require('@grpc/grpc-js');
var protoLoader = require('@grpc/proto-loader');
var packageDefinition = protoLoader.loadSync(
    PROTO_PATH,
    {
        keepCase: true,
        longs: String,
        enums: String,
        defaults: true,
        oneofs: true
    });
var hello_proto = grpc.loadPackageDefinition(packageDefinition).helloworld;

var portgRPC = process.env.HTTP20_ONLY_PORT || 8585

/**
 * Implements the SayHello RPC method.
 */
function sayHello(call, callback) {
    callback(null, { message: 'Hello ' + call.request.name });
}

/**
 * Starts an RPC server that receives requests for the Greeter service at the
 * sample server port
 */
function main() {
    var server = new grpc.Server();
    server.addService(hello_proto.Greeter.service, { sayHello: sayHello });
    server.bindAsync(`0.0.0.0:${portgRPC}`, grpc.ServerCredentials.createInsecure(), () => {
        console.log(`gRPC server listening on ${portgRPC}`)
        server.start();

    });

}

main();