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SYLVAIN WALLEZ

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Random musings of a busy geek
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GETTING MEANINGFUL STACK TRACES FROM RUST TESTS RETURNING A RESULT

I was recently writing a test for a side project in Rust (more on that in a
future post) and was frustrated by the lack of information reported when the
test fails. I ended up with an interesting hack to report the precise location
and error that caused a test to fail.

Posted on Sun 08 January 2023 — Comments

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GO: THE GOOD, THE BAD AND THE UGLY

This is an additional post in the “Go is not good” series. Go does have some
nice features, hence the “The Good” part in this post, but overall I find it
cumbersome and painful to use when we go beyond API or network servers (which is
what it was designed ...

Posted on Tue 10 April 2018 — Comments

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LOCAL DATE TIME CALCULATIONS IN GO

For a side project I'm writing in Go, I needed to send an email to each
registered user during the night. Their night actually, according to each user's
time zone. More precisely at a random time between 3am and 4am to spread email
sending and avoid any rate ...

Posted on Thu 22 March 2018 — Comments

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MICRO BENCHMARKS CAN MAKE YOU SHORT-SIGHTED

In the last 24 hours, two articles related to code benchmarking showed up on my
Twitter timeline, where the authors describe the optimization of a tiny bit of
code via successive benchmarks. Both articles immediately triggered the same
reaction in my head: "WTF, this is wrong! Why did they wrote ...

Posted on Sat 26 November 2016 — Comments

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AFTERNOON HACK: A USB FOOT KEYBOARD

This post explains a quick afternoon hack to turn a foot pedal controller for
music synthesizers into a programmable USB foot keyboard. A couple of weeks ago,
for a personal project, my wife needed to manually transcribe many hours of
interview recordings. Text-to-speech software were failing miserably both
because of ...

Posted on Fri 29 July 2016 — Comments

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BLOG.REBOOT()

This blog is now a static website powered by the Pelican generator. It's the 3rd
major change since I started blogging in 2002. It began with Movable Type, a
Perl blogging tool. There wasn't much choice at that time, and it did the job
even if I did ...

Posted on Sat 18 June 2016 — Comments

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EFFICIENT STORAGE OF NON-PERIODIC TIME SERIES WITH MONGODB

TL;DR: this post explains the MongoDB storage structure we use at Actoboard to
efficiently store non periodic time series. Storing one Mongo document for each
data point is woefully inefficient, so we store them in fixed-size segments,
which speeds things up by more than an order of magnitude. MongoDB ...

Posted on Wed 21 January 2015 — Comments

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GITHUB HACK: A COMMON SECURITY FLAW IN WEBAPP FRAMEWORKS

GitHub has faced a spectacular hack: a disappointed developer has exploited a
weakness in Ruby on Rails to gain commit access to the Rails master branch and
create issues in the future. As a result, GitHub asks us to confirm our ssh
keys, but this can have been used to ...

Posted on Thu 08 March 2012 — Comments

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MY 2011: A YEAR LIKE NO OTHER

This blog has been mostly silent in 2011. Blame both Twitter that makes
capturing quick thoughts so easy and a busy year as I started my freelance
business. But a new year is starting, and along with the traditional wishes I
owe an update to the people that still look ...

Posted on Sun 01 January 2012 — Comments

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HOW OFTEN DO YOU REDEPLOY YOUR J2EE APPLICATION?

The guys at ZeroTurnaround have published an interesting report on the
development habits from over 1300 Java developers. One of the questions that
really struck me was "how often do you redeploy?" My answer to this question is
"on my development machine, never". I use Jetty which is really easy ...

Posted on Tue 11 January 2011 — Comments

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Copyright © Sylvain Wallez