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…I've moved. Free Software-related stuff lives on my GNOME blog, and entertaining pictures of animals live on my tumblog.

Nov. 26th, 2010

lens

Today, in “ridiculous specification I've come across in the course of entirely legitimate work” …

In case just typing a status message wasn't good enough, XEP-0108: User Activity defines an XMPP extension for telling your contacts precisely what you're up to in a machine-readable form … as long as it's one of a rigidly-defined taxonomy of activities. Buying groceries is a kind of chore, whereas shopping is supposedly a form of relaxation; I think some might disagree that you're inactive while praying.

RFC 4480: Rich Presence Extensions to the Presence Information Data Format goes a step further and allows you to specify that you're in a location that's too dark for video, too noisy for audio, and inappropriate for IM. Your mood can be “invincible”, but—distressingly—neither “quixotic” nor “apathetic” are permitted. I think I'll stick to LiveJournal.

(Oh, the title of this post is valid per RFC 4480. Edit: or it would be if it weren't mangled. Time to migrate.)

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MeeGo Conference: Telepathy 1.0 roadmap

lens

The queue for registration

Along with something like 15 other Collaborans, I'm at the MeeGo Conference 2010 in Dublin. I've somehow managed never to visit Ireland before, so I'm hoping to find some time to explore a bit while I'm here.

I'm giving a talk titled The Road to Telepathy 1.0 tomorrow at 9am (yerk!) in the Vavasour Suite. I'll be sketching out a rough roadmap, or rather collection of related goals and schedules; also, there'll be an update on ongoing feature development. Right afterwards, at 9.30, the inimitable Mikhail Zabaluev is speaking on Developing Communication Protocol Implementations in Telepathy, based on Nokia's experience developing SIP, cellular and Skype backends for Telepathy over the past years.

Also, at the Collabora stand we're demoing DSP-accelerated video calls on an OMAP board using GStreamer, and integration with various services in MeeGo Netbook via Telepathy. Collabora folks working on all kinds of projects will be around; see you there!

lens

I just released Bustle 0.2.3. The notable improvement is that you can now view a pair of D-Bus traffic logs side-by-side on the same chart. So if you've taken a trace of the session bus and the system bus, and want to see how the bus traffic matches up on the two, this is the release you've been waiting for! (If not, well, I made the ugly pink lines a more tasteful grey, and fixed some bugs you never noticed.)

While I was refactoring to support the second log, I would have liked to have been able to run Bustle in a “batch” mode to render straight to a file, and then run some kind of visual diff tool to compare the output of the branch versus the last release. Coincidentally, when I opened my inbox, I found a mail requesting the same feature! I imagine that this could come in handy for producing automated reports: maybe you'd have a weekly cron job that produces some stats about the traffic using bustle-count and, if it goes significantly up or down, sends an email to tick off or congratulate the relevant team as appropriate with an attached diagram. ;-) If anyone fancied having a crack at this, it shouldn't be too hard.

lens

Early last month, Lassi Syrjälä released Telepathy-Ring, Nokia’s Telepathy connection manager for GSM telephony, under the LGPL. The version used on the N900 talks to a proprietary daemon to drive the cellular hardware, but this new 2.x.y series has been ported to oFono, Intel and Nokia’s Free cellular modem daemon. I was trying out Ring using oFono’s phone simulator backend, until it was pointed out that oFono also supports my laptop's built-in GSM chip. Oh really? Let’s see…

A few minutes of tweaking later, and I was looking at an apparently-unremarkable Empathy conversation window:

Screenshot of an SMS conversation in Empathy

Ring needed a few little hacks to get this going, mostly because laptops’ GSM chips don’t generally support making GSM calls, which Ring expects to be able to do. But I didn’t have to touch any other Telepathy components’ source: I installed my Ring branch, opened the Empathy accounts dialog, created a new “tel” account, and here we are. +447771██████ in that screenshot is my real actual phone, and this conversation looks just how you’d expect.

Of course, right now this is a proof-of-concept; it’s not really ready for non-developers. I’m planning to clean up my Ring patches for submission upstream over the next few weeks, and will try to trick someone into writing a custom account configuration UI for Empathy; hopefully we can get this working properly pretty soon! Thanks to Lassi, Pekka Pessi (Ring’s original author), and others at Maemo; the oFono team; and other Telepathy and Empathy hackers for making this so straightforward!

lens

Hello internet! I am at FOSDEM 2010 in Brussels. I tried the fosdem-maemo schedule application for my Nokia N900, and decided to write an alternative app which is easier to use with my fingers, and looks more like a Maemo application.

screenshot of foschart

The result is foschart. It's just something I knocked together in a few hours yesterday, but it's pretty usable already. It supports showing talks grouped by track, by room, and just in chronological order, and a list of favourites. It's all happily kinetic-scrollable, etc., and is very snappy once it's started.

There's no proper release or package yet; if you want to package it up properly, please do! But for now, apt-get install python-hildon, then copy foschart.py and schedule.xml to /opt/foschart, and foschart.desktop to /usr/share/applications/hildon. Then it should show up in your application list, and away you go. As ever, patches welcome. Enjoy!

Update:

The illustrious Jonny Lamb has made a package!

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lens

The camera/photo viewer on the N900 has a pretty nice tag cloud widget, which lets you quickly label your photos before you upload them to Flickr. (The novelty hasn't yet worn off!) But an autocompletion accident left me with a tag in the widget that I'd really prefer not to be there when I'm showing off my nice new phone to people.

I spent a happy¹ few hours trying to figure out where it gets the set of tags from. The viewer asks Tracker for the most commonly-used tags, but this tag wasn't used on any of my photos, so wasn't coming from there. In fact, it didn't appear in any of Tracker's database files! After a bit of investigation, I discovered that the photo viewer keeps its own independent set of recently-used tags, not in Tracker, but in GConf, at /apps/osso/image-viewer/recent_tags. Lest you should find yourself in my position, a quick

gconftool --set --type list --list-type=string /apps/osso/image-viewer/recent_tags '[]'

will expunged your undesired utterances from the cloud. Bug report time. Next stop: finding a tool that lets the user remove typos from the autocompletion database …

1. Grr.

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Bustle 0.2.1

lens

A couple of days ago, I released version 0.2.1 of Bustle, someone's favourite D-Bus profiler. As the version number suggests, there aren't really any big new features; most of the changes just make it a bit nicer to use, like showing you all the bus names a service owns, ellipsizing strings, a slightly less spartan UI, etc. Having finally gotten around to cutting a release, I've started wondering what to work on next. There are various small things I have in mind, such as searching, filtering, integrating the various statistic tools (bustle-time and friends) into the UI, and so on, but it'd be nice to have a larger goal to work towards.

One recurring feature request is the ability to see messages' arguments. This isn't currently possible because the simple plain-text logs produced by the monitor (which is a variation on the theme of dbus-monitor --profile) only includes the message header. I've thought for a while that the right thing to do would be to log the raw dbus messages, together with a timestamp, but wasn't sure what the files would look like. (Maybe shove the timestamps into the message headers?) Rob had a nice idea: why not log to pcap files? This avoids inventing a new format—the UI would just use libpcap and feed each message through the dbus parser—and would also let you look at the logs in WireShark, if you're into that kind of thing. I'm hoping to find some time to give this a shot soon. (Maybe on a cold Christmas evening, in front of a fire?)

In the meantime, have a peek at what your D-Bus-using applications are up to, and let me know what's missing!

Telepathy BOF at the Boston Summit

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Jason's hands were tired after typing two days of excellent notes on sessions at the Gnome Summit, so I took over writing up the Telepathy BOF (which was largely about Telepathy integration in Gnome Games).

Gnome Games's tubes code is broken because of Empathy moving to Mission Control 5, which broke the contact chooser they were using (which used Mission Control 4). A Canonical person (your scribe did not catch who it was) has written a contact selector in C which just uses telepathy-glib, which Gnome Games will use and then start working again. This widget could form the basis of the long-anticipated telepathy-gtk.

Rob pointed out that it's currently a bit of pain to request a channel for yourself: you can't just call one D-Bus method and get a channel back, you also have to implement a Client.Handler object on which MC will call the HandleChannels() method. Sjoerd noted that Empathy has helper code for doing this in simple cases, which could be moved to tp-glib (it's under the LGPL).

Jason wants a way to share high scores with your contacts. (Digression about a gnome-games high score server on gnome.org ensued, the notes of which your scribe lost in a kernel panic. One main point is that global high scores end up just featuring incredibly good scores and people setting their name to obscenities.) Jason wonders if g-g could publish your high scores to your contacts in the background?

  • Rob and Will suggested that in principle this could use PEP on XMPP, which allows you to publish a blob of information to your XMPP server and be notified when your contacts' blobs change. (This is how Geolocation works in Empathy, for instance.) Unfortunately Google's server doesn't support PEP, so most people wouldn't be able to use this; plus, it would need an extension in Gabble.
  • Another way to do it would be to initiate file transfers behind the scenes.
  • Rob suggested using tubes. Gnome Games would come with a tiny daemon that handles tubes for the "org.gnome.games.highscores" service, serving up your high scores to anyone who asks. Then, when you open a high scores table, it would use ContactCapabilities to discover which of your online contacts support that service, and then ask them for their latest high scores (with a cache and a rate limit, obviously). It could show a throbber while it's doing this. Jason thinks this sounds like a good idea. Prerequisites: you need the latest MC and Gabble 0.9 in order for ContactCapabilities to work, but that's it.

J5 wondered if any g-g people are documenting how they're using tubes, because he was always confused by them, and he reckons this is a very important thing for app developers. Rob suggested pushing this into tp-book, and Sjoerd noted that Danielle has a helper which lets you say "give me a stream to this person" and get a GIOChannel back branch with methods to convert between telepathy address GValues and GSocketAddresses, which could conceivably be extended to set up a socket automatically. J5 thinks that if patterns for using tubes were really well documented, people would jump on the chance to use them.

Jason mentioned that people were discussing having a help option which jumps you to #gnome-games-$lang. J5 said that Ximian tried that, but found that people would just end up in empty chatrooms or paste goatse at each other. Integration with DevHelp would be nice to let people post examples etc.

J5 suggested that another good way to improve documentation is to make writing it a requirement for SoC. Rob noted that Telepathy hackers know that you need to use, eg., a Handler and a Tube, but it's hard for people really immersed in the stack to remember which prerequisites people need to learn in order to understand that stuff. Sandy said they'd been discussing documenting requirements and standards for SoC students, and thinks it's a great idea to ask students to blog stream-of-consciousness "this is what i did" updates. People have to make sure that they do this as they go along, because you forget the learning process after a few weeks.

Advantage of peer-to-peer high scores: you don't get the problem of one incredibly good person dominating. ajaxxx suggested that you could make high scores decay over time, or once you reach a particular level, to address this problem.

Tetrinet is latency-sensitive: will that be a problem with Telepathy, particularly using MUC tubes? Rob said just try it and if it's too slow it'll get faster as the implementation of Tubes improves. Sjoerd noted that for tetrinet you probably want to just export the Tetrinet server over a multi-user stream tube, rather than using d-tubes.

Telepathy should use UPnP to make FT and tubes fast in more cases. This is on the TODO list.

Boston Gnome Summit and Maemo Summit

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I'm just getting ready to fly away to Boston for the Gnome Summit. I'm looking forward to meeting people and seeing MIT, as well as getting the chance to spend more than a few hours in Boston (unlike every other time I've been there).

Inevitably, I haven't been organised enough to propose a Telepathy- or Empathy-related session, but Rob McQueen, Sjoerd Simons, Andres Salomon, Dafydd Harries, Shaun McCance (when he's not busy running a pair of interesting-sounding documentation sessions!) and myself will be around if people are interested; maybe something will coalesce. If window manager theming is more your kind of bag, Thomas Thurman's running a session on CSS in Metacity/Mutter. It'd be great to talk about integrating IM with the Gnome Shell; Moblin's people panel and many parts of Maemo make interesting use of Telepathy, and it'd be nice to have something similar on the desktop.

Speaking of Maemo, going to Boston means I'm not at the Maemo Summit in Amsterdam, which is a real shame: I'd love to meet more of the Maemo community, hear what people have up their sleeves for the N900, and discuss how Telepathy could help. Happily, Marco Barisione's giving a talk about how Telepathy's used on Maemo, and how you can use it too; relatedly, Travis Reitter and Mathias Hasselmann will speak about the address book, one of the heaviest users of Telepathy. Also, Marc Ordinas i Llopis is hosting a BoF on extending the (frankly stunning) Hildon desktop, and Ian Monroe is giving a talk with Sergiy Dubovik about preparing Qt4 applications for Fremantle and Harmattan. I hear Philippe Kalaf is also floating around somewhere. ☺

See you in (the wrong) Cambridge!

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