Convert backend code to ES modules

Bundling code now with Rollup for its flat bundling and tree shaking
support. Front end code still goes through Webpack for browser support.

lib/cwmp.js

@@ -18,20 +18,20 @@
  */
 "use strict";
 
-const zlib = require("zlib");
-const crypto = require("crypto");
-const fs = require("fs");
-const config = require("./config");
-const common = require("./common");
-const soap = require("./soap");
-const session = require("./session");
-const query = require("./query");
-const device = require("./device");
-const cache = require("./cache");
-const localCache = require("./local-cache");
-const db = require("./db");
-const logger = require("./logger");
-const scheduling = require("./scheduling");
+import zlib from "zlib";
+import crypto from "crypto";
+import fs from "fs";
+import * as config from "./config";
+import * as common from "./common";
+import * as soap from "./soap";
+import * as session from "./session";
+import * as query from "./query";
+import * as device from "./device";
+import * as cache from "./cache";
+import * as localCache from "./local-cache";
+import * as db from "./db";
+import * as logger from "./logger";
+import * as scheduling from "./scheduling";
 
 const MAX_CYCLES = 4;
 const MAX_CONCURRENT_REQUESTS = config.get("MAX_CONCURRENT_REQUESTS");
@@ -771,7 +771,7 @@ function getSession(connection, sessionId, callback) {
 const currentSessions = new WeakMap();
 
 // When socket closes, store active sessions in cache
-function onConnection(socket) {
+export function onConnection(socket) {
   // The property remoteAddress may be undefined after the connection is
   // closed, unless we read it at least once (caching?)
   socket.remoteAddress;
@@ -996,7 +996,7 @@ function processRequest(sessionContext, rpc) {
   }
 }
 
-function listener(httpRequest, httpResponse) {
+export function listener(httpRequest, httpResponse) {
   stats.totalRequests += 1;
 
   if (httpRequest.method !== "POST") {
@@ -1243,6 +1243,3 @@ function listener(httpRequest, httpResponse) {
     });
   });
 }
-
-exports.listener = listener;
-exports.onConnection = onConnection;