Bug 1494615 - Update adb-addon module to expose a singleton;r=ladybenko

Depends on D7403
The getADBAddon/forgetADBAddon is not removing listeners or doing
anything useful since the next call to getADBADdon will just recreate an
instance of ADBAddon. We can expose a singleton and use lazy requires to
achieve the same effect

Differential Revision: https://phabricator.services.mozilla.com/D7404

--HG--
extra : moz-landing-system : lando

devtools/client/aboutdebugging-new/src/modules/usb-runtimes.js

@@ -5,7 +5,7 @@
 "use strict";
 
 const { ADBScanner } = require("devtools/shared/adb/adb-scanner");
-const { getADBAddon } = require("devtools/shared/adb/adb-addon");
+loader.lazyRequireGetter(this, "adbAddon", "devtools/shared/adb/adb-addon", true);
 
 /**
  * This module provides a collection of helper methods to detect USB runtimes whom Firefox
@@ -22,7 +22,6 @@ function disableUSBRuntimes() {
 exports.disableUSBRuntimes = disableUSBRuntimes;
 
 async function enableUSBRuntimes() {
-  const adbAddon = getADBAddon();
   if (adbAddon.status !== "installed") {
     console.error("ADB extension is not installed");
     return;

devtools/client/webide/content/addons.js

@@ -2,16 +2,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
+const {loader, require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
 
 const Services = require("Services");
 const Strings = Services.strings.createBundle("chrome://devtools/locale/webide.properties");
 
 const {gDevTools} = require("devtools/client/framework/devtools");
-const {getADBAddon, forgetADBAddon} = require("devtools/shared/adb/adb-addon");
 const {ADBScanner} = require("devtools/shared/adb/adb-scanner");
 const {RuntimeScanners} = require("devtools/client/webide/modules/runtimes");
 
+loader.lazyRequireGetter(this, "adbAddon", "devtools/shared/adb/adb-addon", true);
+
 window.addEventListener("load", function() {
   document.querySelector("#aboutaddons").onclick = function() {
     const browserWin = Services.wm.getMostRecentWindow(gDevTools.chromeWindowType);
@@ -23,24 +24,18 @@ window.addEventListener("load", function() {
   BuildUI();
 }, {capture: true, once: true});
 
-window.addEventListener("unload", function() {
-  forgetADBAddon();
-}, {capture: true, once: true});
-
 function CloseUI() {
   window.parent.UI.openProject();
 }
 
 function BuildUI() {
-  const addon = getADBAddon();
-
   function onAddonUpdate(arg) {
     progress.removeAttribute("value");
-    li.setAttribute("status", addon.status);
+    li.setAttribute("status", adbAddon.status);
-    status.textContent = Strings.GetStringFromName("addons_status_" + addon.status);
+    status.textContent = Strings.GetStringFromName("addons_status_" + adbAddon.status);
-    if (addon.status == "installed") {
+    if (adbAddon.status == "installed") {
       RuntimeScanners.add(ADBScanner);
-    } else if (addon.status == "uninstalled") {
+    } else if (adbAddon.status == "uninstalled") {
       RuntimeScanners.remove(ADBScanner);
     }
   }
@@ -57,18 +52,18 @@ function BuildUI() {
     }
   }
 
-  addon.on("update", onAddonUpdate);
+  adbAddon.on("update", onAddonUpdate);
-  addon.on("failure", onAddonFailure);
+  adbAddon.on("failure", onAddonFailure);
-  addon.on("progress", onAddonProgress);
+  adbAddon.on("progress", onAddonProgress);
 
   window.addEventListener("unload", function() {
-    addon.off("update", onAddonUpdate);
+    adbAddon.off("update", onAddonUpdate);
-    addon.off("failure", onAddonFailure);
+    adbAddon.off("failure", onAddonFailure);
-    addon.off("progress", onAddonProgress);
+    adbAddon.off("progress", onAddonProgress);
   }, {once: true});
 
   const li = document.createElement("li");
-  li.setAttribute("status", addon.status);
+  li.setAttribute("status", adbAddon.status);
 
   const name = document.createElement("span");
   name.className = "name";
@@ -80,18 +75,18 @@ function BuildUI() {
 
   const status = document.createElement("span");
   status.className = "status";
-  status.textContent = Strings.GetStringFromName("addons_status_" + addon.status);
+  status.textContent = Strings.GetStringFromName("addons_status_" + adbAddon.status);
   li.appendChild(status);
 
   const installButton = document.createElement("button");
   installButton.className = "install-button";
-  installButton.onclick = () => addon.install();
+  installButton.onclick = () => adbAddon.install();
   installButton.textContent = Strings.GetStringFromName("addons_install_button");
   li.appendChild(installButton);
 
   const uninstallButton = document.createElement("button");
   uninstallButton.className = "uninstall-button";
-  uninstallButton.onclick = () => addon.uninstall();
+  uninstallButton.onclick = () => adbAddon.uninstall();
   uninstallButton.textContent = Strings.GetStringFromName("addons_uninstall_button");
   li.appendChild(uninstallButton);
 

devtools/client/webide/content/webide.js

@@ -6,7 +6,7 @@
 /* import-globals-from project-panel.js */
 /* import-globals-from runtime-panel.js */
 
-const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
+const {loader, require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
 const {gDevTools} = require("devtools/client/framework/devtools");
 const {gDevToolsBrowser} = require("devtools/client/framework/devtools-browser");
 const {Toolbox} = require("devtools/client/framework/toolbox");
@@ -16,12 +16,13 @@ const {Connection} = require("devtools/shared/client/connection-manager");
 const {AppManager} = require("devtools/client/webide/modules/app-manager");
 const EventEmitter = require("devtools/shared/event-emitter");
 const promise = require("promise");
-const {getADBAddon} = require("devtools/shared/adb/adb-addon");
 const {getJSON} = require("devtools/client/shared/getjson");
 const Telemetry = require("devtools/client/shared/telemetry");
 const {RuntimeScanners} = require("devtools/client/webide/modules/runtimes");
 const {openContentLink} = require("devtools/client/shared/link");
 
+loader.lazyRequireGetter(this, "adbAddon", "devtools/shared/adb/adb-addon", true);
+
 const Strings =
   Services.strings.createBundle("chrome://devtools/locale/webide.properties");
 
@@ -86,7 +87,6 @@ var UI = {
     // If the user decides to uninstall any of this addon, we won't install it again.
     const autoinstallADBExtension = Services.prefs.getBoolPref("devtools.webide.autoinstallADBExtension");
     if (autoinstallADBExtension) {
-      const adbAddon = getADBAddon();
       adbAddon.install();
     }
 

devtools/shared/adb/adb-addon.js

@@ -5,7 +5,6 @@
 "use strict";
 
 const {AddonManager} = require("resource://gre/modules/AddonManager.jsm");
-const {Devices} = require("resource://devtools/shared/apps/Devices.jsm");
 const Services = require("Services");
 const EventEmitter = require("devtools/shared/event-emitter");
 
@@ -29,32 +28,11 @@ if (platform.includes("Win")) {
   }
 }
 
-const addonsListener = {};
-addonsListener.onEnabled =
-addonsListener.onDisabled =
-addonsListener.onInstalled =
-addonsListener.onUninstalled = (updatedAddon) => {
-  getADBAddon().updateInstallStatus();
-};
-AddonManager.addAddonListener(addonsListener);
-
-// adbAddon is the exposed singleton for ADBAddon.
-let adbAddon = null;
-function getADBAddon() {
-  if (!adbAddon) {
-    adbAddon = new ADBAddon();
-  }
-  return adbAddon;
-}
-exports.getADBAddon = getADBAddon;
-
-exports.forgetADBAddon = function() {
-  adbAddon = null;
-};
-
 function ADBAddon() {
   EventEmitter.decorate(this);
 
+  this._status = "unknown";
+
   // This addon uses the string "linux" for "linux32"
   const fixedOS = OS == "linux32" ? "linux" : OS;
   this.xpiLink = ADB_LINK.replace(/#OS#/g, fixedOS);
@@ -63,10 +41,16 @@ function ADBAddon() {
   this.uninstallOldExtension();
 
   this.updateInstallStatus();
+
+  const addonsListener = {};
+  addonsListener.onEnabled =
+  addonsListener.onDisabled =
+  addonsListener.onInstalled =
+  addonsListener.onUninstalled = () => this.updateInstallStatus();
+  AddonManager.addAddonListener(addonsListener);
 }
 
 ADBAddon.prototype = {
-  _status: "unknown",
   set status(value) {
     Devices.adbExtensionInstalled = (value == "installed");
     if (this._status != value) {
@@ -74,6 +58,7 @@ ADBAddon.prototype = {
       this.emit("update");
     }
   },
+
   get status() {
     return this._status;
   },
@@ -158,3 +143,5 @@ ADBAddon.prototype = {
     this.installFailureHandler(install, "Install failed");
   },
 };
+
+exports.adbAddon = new ADBAddon();