load settings from evn vars

app.js

@@ -2,13 +2,11 @@ import fetch from "node-fetch"
 import express from "express"
 
 const app = express();
-const port = 3000;
 
-//TODO load these values from setting or env
-
-const IROHA_API_HOST = "http://localhost";
-const IROHA_API_PORT = 5000;
-const IROHA_DOMAIN = "test";
+const CHAIN4ALL_SERVICE_PORT = process.env.CHAIN4ALL_SERVICE_PORT || 3000;
+const IROHA_API_HOST = process.env.IROHA_API_HOST || "http://localhost";
+const IROHA_API_PORT = process.env.IROHA_API_PORT || 5000;
+const IROHA_DOMAIN = process.env.IROHA_DOMAIN || "test";
 
 app.post("/price", (req, res) => {
     //TODO implement price calculation depending on extent area
@@ -71,8 +69,8 @@ app.post("/buy", (req, res) => {
     res.status(201);
 });
 
-app.listen(port, () => {
-    console.log(`Listening at http://localhost:${port}`)
+app.listen(CHAIN4ALL_SERVICE_PORT, () => {
+    console.log(`Listening at http://localhost:${CHAIN4ALL_SERVICE_PORT}`)
 });
 
 async function fetchUsersAssets(userId){