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Steve Vinoski's Blog

Ask forgiveness, not permission.


New Year’s Integration ResolutionsToday

My first Internet Computing column of 2009 is now available. It’s entitled “New Year’s Integration Resolutions” and it offers advice pertaining to areas of integration and distributed systems where over the years I’ve seen various companies and individuals, including myself at times, repeat the same common mistakes. I give the advice in the form of some suggested new year’s resolutions, hence the title.

Something to note about this column is that it completes 7 years of “Toward Integration.” That’s a long time, trust me. :-) Two years ago I stopped working on middleware and integration as a full-time role, so it doesn’t really feel right anymore for me to still be doling out advice on those topics, and I’ve definitely used up all the residual topics I had left. What this means is that this is the final “Toward Integration” column you’ll ever see.

Whether that’s good news or bad news depends, of course, on whether you liked or disliked “Toward Integration.” :-) I generally received positive feedback over the years on all the columns, but I know there are some out there who disagreed with some of them. That’s perfectly normal, of course. Regardless of which camp you fall in, if you ever sent me considered feedback on any of the columns, I really appreciate it.

But then again, I should be clear that it’s not truly the end; I’ll be startin

Sendfile for YawsJanuary 5

A few months back Klacke gave me committer rights for Yaws. I’ve made a few fixes here and there, including adding support for passing “*” as the request URI for OPTIONS, enabling OPTIONS requests to be dispatched to appmods and yapps, and completing a previously-submitted patch for configuring the listen backlog. Klacke has just started putting a test framework into the codebase and build system so that contributors can include tests with any patches or new code they submit, and I’ve contributed to that as well.

The biggest feature I’ve added to date, though, is a new linked-in driver that allows Yaws to use the sendfile system call on Linux, OS X, and FreeBSD. I never wrote a linked-in driver before, so I was happy and fortunate to have an Erlang expert like Klacke providing hints and reviewing my code.

I did some preliminary testing that showed that sendfile definitely improves CPU usage across the board but depending on file size, sometimes does so at the cost of increasing request times. I used my otherwise idle 2-core 2.4GHz Ubuntu

More SHA in ErlangJanuary 3

Yesterday I posted a SHA-256 Erlang module, but I figured since other SHA algorithms are similar, I might as well finish the job. I grabbed the Secure Hash Standard and went to work.

The resulting new module is named sha2 and it implements SHA-224, SHA-256, SHA-384, and SHA-512.

I hope you find it useful.

SHA-256 in ErlangJanuary 2

Sriram Krishnan was recently lamenting the lack of SHA-256 support in Erlang’s crypto module, so just for fun I wrote a simple sha256 module based on the pseudocode in Wikipedia. The tests use the test data from this C implementation.

[Update: I've posted a new module that implements more SHA digest variants and so renders this module obsolete.]

mimeparse in PerlDecember 21 2008

Following quickly on the heels of mimeparse in JavaScript, we now also have mimeparse in Perl, thanks to Stanis Trendelenburg.