OpenGlucose: Again

September 8th, 2014 by xclaesse

Made progress this weekend on OpenGlucose. The GUI is still ugly but it has the info I want.

Important things on my wish-list, when I have time:

  1. Handling the units. My only device is mg/dl but other countries uses mmol/L. Since I’m living in Canada where they use mmol/L I should grab a new device with those units, so I’ll be able to compare logs and see how to know in which unit the device is configured.
  2. Make printable report, I’ve heard doctors like that. OTOH, I shouldn’t encourage using unofficial app for medical purpose.
  3. Support other FreeStyle devices. I’m pretty sure they all have the same kind of format so most of the parser should be reusable, I hope. I should be able to get a spare FreeStyle Freedom Lite in a few weeks.
  4. Publish an ubuntu package on a PPA.
  5. CSV export.
  6. Ideas?

I’m curious, does someone else own an InsuLinx and tried OpenGlucose yet? Or even tried to support another device?



OpenGlucose: continued

August 26th, 2014 by xclaesse

I started working on the UI to display the results:

openglucoseIt is made using a GtkApplicationWindow containing a WebkitWebView, the content is made with HTML/CSS/JS with jquery and the chart is made using jqplot.

To make testing easier, I also added a dummy device that has random data, it can be enabled by setting OPENGLUCOSE_DUMMY_DEVICE=1 in your env.

A lot more work is needed, but that’s a start.

New project: OpenGlucose

August 17th, 2014 by xclaesse

Hello there,

I recently got diagnosed with a diabetes type 1. Like all diabetics, I got a glucometer device that comes with a windows/mac closed-source application. That’s clearly not acceptable for a freedom lover! So here is my new challenge: reverse-engineer the USB protocol of my Abbott FreeStyle InsuLinx device, and write an open source Linux application for it.

And here it is:

So far it only fetch the bare minimum information from the device and print them in the terminal. More GUI/features will come later.

If you’re a geek diabetic, your help is welcome!

OTR in Empathy

May 4th, 2014 by xclaesse

It was a really popular Empathy feature request, it even has a bounty on it, and today I just did it! The patches are available in bugzilla, apply on telepathy-gabble and empathy master.

Here is a screencast of OTR in action between Empathy and Pidgin:

I hacked it on my free time, let’s see if crowd funded projects really works. If you like that feature feel free to make a donation on the bounty:

Folks2 progress

November 24th, 2013 by xclaesse

I am working on Folks2 when I have a bit of free time. In short it is a rewrite from scratch of Folks in C with a daemon/db to remember who is merged with who. The goal is to be faster and being able to load individuals separately instead of having to load them all.

Recently, I’ve been writing libfolks2-roster, a GTK library providing widgets to display a contact list and contact details. It is using awesome GTK 3.10 GtkListBox, GtkStack and GtkSearchBar. The main issue I’m facing now is GtkListBox slowness, it really needs a model to create only visible widgets.

(Yes it is ubuntu theme, I’m usually using unity but video recording didn’t work)

Catch leaks in your unit tests

October 29th, 2013 by xclaesse

Let’s blog about my little trick that should be useful to everyone: Not everyone runs unit tests in valgrind, and even if they do it’s hard to see leaks from false-positive. Fortunately there is an easy way to catch GObject leaks in a unit test without using valgrind:

foo = my_object_new ();
g_object_add_weak_pointer (G_OBJECT (foo), (gpointer) &foo);
g_object_unref (foo);
g_assert (foo == NULL);

Do that on every object in your unit tests, it’s amazing what you can find…

Problems with Windows Live’s XMPP server

June 20th, 2012 by xclaesse

As you probably know (see here and there), it is possible to connect to MSN using the XMPP protocol with GNOME 3.4.

However, since last week, I think nobody can connect anymore. The reason is that MS server started using see-other-host, which is perfectly standard (part of XMPP CORE), but not implemented into telepathy-gabble. I can’t really blame them for this since they warned developers twice, and even then, it became effective much later than they announced.

The problem is described and patches are available in bug #51033, it should hit telepathy-gabble master soon. I’ll also consider backporting to stable branch, but patches are a bit intrusive…

There is a 2nd problem with WLM’s XMPP server that sometimes prevent us to connect. This time it is really a server issue out of our control. I’ve sent all needed logs and MS devs are actively working on the issue. However, retrying to connect multiple times (which we do by default) eventually succeed after some attempts.

Last but not least, it is possible to ADD (not REMOVE, wondering why their server does not accept that…) contacts in your MSN account. But WLM server uses a non-standard trick for that, to convert a Live account (e.g. to a jid (e.g. The non-standard iq are described here, and telepathy-gabble patches are available in bug #50341 to make it work.

I’m happy this is not useless work, since we have now over 10 000 monthly unique users connecting to MSN with XMPP through gnome-online-account (I’m app key owner, so I get usage stats).

Edit: telepathy-gabble 0.16.1 now released with a fix for the see-other-host issue.

Did you know g_clear_object/pointer() ?

April 27th, 2012 by xclaesse

g_clear_object() has been in glib since 2.28, and now g_clear_pointer() has landed in glib master (see bug #674634).
Their typical usage is to implement GObject::dispose, or “goto out” pattern, previously you would write:

void my_dispose (GObject *obj)
  MyObject *self = (MyObject *) obj;
  if (self->priv->object != NULL)
      g_object_unref (self->priv->object);
      self->priv->object = NULL;
  if (self->priv->hash != NULL)
      g_hash_table_unref (self->priv->hash);
      self->priv->my_hash = NULL;


void some_func ()
  GHashTable *tmp = NULL;

  if (error)
    goto out;

  tmp = g_hash_table_new();

  if (tmp != NULL)
    g_hash_table_unref (tmp);

But now those becomes:

void my_dispose (GObject *obj)
  MyObject *self = (MyObject *) obj;

  g_clear_object (&self->priv->object);
  g_clear_pointer (&self->priv->hash, g_hash_table_unref);


void some_func ()
  GHashTable *tmp = NULL;

  if (error)
    goto out;

  tmp = g_hash_table_new();

  g_clear_pointer (&tmp, g_hash_table_unref);

As extra bonus, g_clear_object() and g_clear_pointer() are thread-safe. That means that 2 threads can clear the same pointer at the same time and it will be freed only once. I’ve heard some code needs thread-safe dispose…

Thanks to Simon McVittie for the original idea in telepathy-glib where we had tp_clear_object/pointer for years.

GTestDBus – test your DBus app

April 26th, 2012 by xclaesse

Recently, I’ve been working on making GDBus’ unit test helpers as public API on libgio (see bug #672985). Thanks to the help from David Zeuthen, it landed in gio master as GTestDBus object.

The basic idea is simple: g_test_dbus_up() starts a dbus-daemon and sets DBUS_SESSION_BUS_ADDRESS env variable. That means that your tests will then be using that private session bus instead of messing with user’s. When the unit test is done, call g_test_dbus_down() which will kill the dbus-daemon. Of course in the case you unit test fails and crash, it still make sure the dbus-daemon will be cleaned.

And finally, thanks to Alexander Larsson, it even works on win32.

Enjoy :D

git fork – quickly publish your git branches

April 24th, 2012 by xclaesse

When working with a new git project, I like to publish my patches in git branches on my public git server. I usually use the collabora git server, but some people also have account on freedesktop, etc. But it’s a bit long just to publish a branch:

  1. locally: git clone ssh://
  2. locally: ssh
  3. collabora: cd public_html/git && git init --bare git://
  4. locally: git remote add xclaesse git+ssh://

Note how GNOME urls are different in 1) and 3), not only the ssh:// VS git:// but also the extra /git/ and it’s different with freedesktop.

So my first step to simplify this is to define insteadOf URLs in ~/.gitconfig both locally and on server:


[url "ssh://"]
    insteadof = gnome:
[url "git+ssh://"]
    insteadof = collabora:

on server:

[url "git://"]
    insteadof = gnome:

Now the steps are:

  1. locally: git clone gnome:empathy
  2. locally: ssh
  3. collabora: cd public_html/git && git init --bare gnome:empathy
  4. locally: git remote add xclaesse collabora:empathy

Still I’m lazy so I don’t like sshing the server manually, so the final step is to add this git alias in your local ~/.gitconfig:

    fork = !git config --get remote.origin.url | xargs -n 1 ssh \"cd ~/public_html/git && git init --bare\"

That will create a public repository for the project you’re currently in, just by typing “git fork”! Steps are now:

  1. locally: git clone gnome:empathy
  2. locally: git fork
  3. locally: git remote add xclaesse collabora:empathy

Update: It’s more flexible with a python script, save it as “git-fork”, put it somewhere in your PATH and chmod +x


import subprocess

remote_host = ""
git_remote_prefix = "collabora:"
git_remote_name = "zdra"

# Get current git repository's name
remote = subprocess.check_output(["git", "config", "--get", "remote.origin.url"]).strip()
name = remote[max (remote.rfind("/"), remote.rfind(":")) + 1:]
if not name.endswith(".git"):
    name = name + ".git"

# Create a remote repository
remote_cmd = "cd ~/public_html/git && git init --bare " + name (["ssh", remote_host, remote_cmd])

# Add the remote repository to git remotes and push master (["git", "remote", "add", git_remote_name, git_remote_prefix + name]) (["git", "push", git_remote_name, "master"])