code of subgraph converted to graphQl without testing

.env

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+NODE_MODE=developement
+DATABASE_URL_LOCAL=mongodb://localhost:27017/V2-graphQL
+DATABASE_URL_ONLINE=mongodb+srv://admin:[email protected]/V2-graphQL?retryWrites=true&w=majority
+FACTORY_ADDRESS=hash-0000000000000000000000000000000000000000000000000000000000000000
+token0=hash-0000000000000000000000000000000000000000000000000000000000000000
+token1=hash-0000000000000000000000000000000000000000000000000000000000000000
+pair=hash-0000000000000000000000000000000000000000000000000000000000000000

.gitignore

@@ -0,0 +1 @@
+/node_modules

app.js

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+var createError = require('http-errors');
+var express = require('express');
+var path = require('path');
+var cookieParser = require('cookie-parser');
+var logger = require('morgan');
+
+var app = express();
+const mongoose = require("mongoose");
+require("dotenv").config();
+const { graphqlHTTP } = require("express-graphql");
+const schema = require("./graphql/schema");
+
+// view engine setup
+app.set('views', path.join(__dirname, 'views'));
+app.set('view engine', 'jade');
+
+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')));
+
+var DB_URL;
+
+if (process.env.NODE_MODE == "deployed") {
+  DB_URL = process.env.DATABASE_URL_ONLINE;
+} else {
+  DB_URL = process.env.DATABASE_URL_LOCAL;
+}
+
+console.log("DB_URL : " + DB_URL);
+
+const connectionParams = {
+  useNewUrlParser: true,
+  useUnifiedTopology: true,
+  autoIndex: false,
+};
+const connect = mongoose.connect(DB_URL, connectionParams);
+// connecting to the database
+connect.then(
+  (db) => {
+    console.log("Connected to the MongoDB server\n\n");
+  },
+  (err) => {
+    console.log(err);
+  }
+);
+
+app.get("/", (req, res) => {
+  res.json({ msg: "GraphQL Demo Server" });
+});
+
+app.use('/graphql', graphqlHTTP({
+  schema: schema,
+  graphiql: true,
+}));
+
+// 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;

bin/www

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('graphql:server');
+var http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app);
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  var addr = server.address();
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}