Jared Hirsch jaredhirsch

These notes are based on the 2016? Mozilla C++ and Gecko onboarding presentation by froydnj: https://mozilla.hosted.panopto.com/Panopto/Pages/Embed.aspx?id=65922cea-26e0-4d3b-a5da-ac1600012f45

The original slides are still available, which link off to some historical MDN pages (you can find them on the internet archive in many cases): https://docs.google.com/presentation/d/1ZHUkNzZK2TrF5_4MWd_lqEq7Ph5B6CDbNsizIkBxbnQ/edit#slide=id.p

Basic topics to cover:

Subsystems in Gecko
XPCOM strings and datatypes

(Note: I moved this info into the main FxA readme at https://github.com/mozilla/fxa.)

Attaching a debugger to a running node process, sadly, requires running google chrome (AFAIK).

How to do it:

Start google chrome and open up chrome://inspect.
Run a node process using the --inspect or --inspect-brk flags (see specific command-line incantations below)

this is webpack require 8 in studyutils.jsm, beautified:

module.exports = {
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "study setup",
    "type": "object",
    "definitions": {
        "idString": {
            "description": "between 1,100 chars, no spaces, unicode ok.",

I got pinged on bug 1387598, some Windows-only crashes in a Talos test that deliberately prevents the sessionstore-windows-restored event from firing. Screenshots 10.10 seemed to cause the regression. (As a reminder, 10.10 includes a fix to synchronize startup and shutdown, see discussion in screenshots pull request #3260.)

Looking at the Talos test definition on dxr, it appears that the test causes the event to never fire:

# inside mozilla-central/testing/talos/talos/test.py, revision 4c5fbf493763, line 181:

@register_test()
class sessionrestore_no_auto_restore(sessionrestore):
    """

	state.PCH {
	control.1 {
	iface MIXER
	name 'Headphone Playback Volume'
	value.0 0
	value.1 0
	comment {
	access 'read write'
	type INTEGER
	count 2

	[15:51:37 mozilla-fxa (mozilla-master) ]$ npm install

	> [email protected] postinstall /Users/jh/codez/github/mozilla-fxa
	> _scripts/postinstall.sh

	+ '[' '' = true ']'
	+ _scripts/install_all.sh
	+ _scripts/check.sh
	++ which rustup
	+ [[ ! -n /Users/jh/.cargo/bin/rustup ]]

	[15:15:11 fxa-auth-server (mozilla-master) ]$ npm install

	> @newrelic/[email protected] install /Users/jh/codez/github/mozilla-fxa/packages/fxa-auth-server/node_modules/@newrelic/native-metrics
	> node ./lib/pre-build.js install native_metrics

	> /usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js clean configure
	> /usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build -j 6 native_metrics
	CXX(target) Release/obj.target/native_metrics/src/native_metrics.o
	CXX(target) Release/obj.target/native_metrics/src/GCBinder.o
	CXX(target) Release/obj.target/native_metrics/src/LoopChecker.o

	[09:00:49 fxa-js-client (mozilla-master) ]$ npm run test

	> [email protected] test /Users/jh/codez/github/mozilla-fxa/packages/fxa-js-client
	> grunt test

	Running "intern:node" (intern) task
	DEBUG: 'failed to load resource (/Users/jh/codez/github/mozilla-fxa/packages/fxa-js-client/node_modules/intern-geezer/node_modules/dojo/_base/array.js)'
	DEBUG: { Error: ENOENT: no such file or directory, open '/Users/jh/codez/github/mozilla-fxa/packages/fxa-js-client/node_modules/intern-geezer/node_modules/dojo/_base/array.js'
	at Object.openSync (fs.js:443:3)
	at Object.readFileSync (fs.js:343:35)

	commit d67700eadc05178d275d526bd696f2dacaf83221
	Author: Jared Hirsch <[email protected]>
	Date: Tue Jan 22 16:21:23 2019 -0800

	Add Logins API utility method to get domain name, minus TLD, from a URL

	diff --git a/src/experiments/logins/api.js b/src/experiments/logins/api.js
	index 15dbf53..71412a2 100644
	--- a/src/experiments/logins/api.js
	+++ b/src/experiments/logins/api.js