When using happstack, I find it really annoying to get a Prelude.head:
null list error (or similar) in my web browser window because
somewhere, some library used something unsafe -- and of course, since
this is haskell, no stack trace.
if c-m-e can offer benefits around this, I would be very interested in
adopting it.
thomas.
2009/11/3 Henning Thielemann
Jose Iborra schrieb:
Folks,
I'm happy to announce a new release of control-monad-exception with monadic call traces, available in Hackage. Grab it now while it is still online!
Monadic stack traces are described in detail in a blog post [1].
In short, what this means for your code is the ability to generate errors like this:
500 Internal Server Error The CGI server failed with the following error: DeleteException (BmPK 2009-10-26 19:39:51.031297 UTC "Testing RPO") in deleteBenchmarkFromPK, NarradarBenchmarkDB(src/NarradarBenchmarkDB.hs): (186, 44) deleteBenchmarkFromPK, NarradarBenchmarkDB(src/NarradarBenchmarkDB.hs): (186, 25) deleteBenchmarkFromPK, NarradarBenchmarkDB(src/NarradarBenchmarkDB.hs): (184, 17) deleteBenchmarkFromPK, NarradarBenchmarkDB(src/NarradarBenchmarkDB.hs): (180, 90) deleteTests, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (108, 3) deleteTests, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (106, 20) cgiMain, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (52, 33) cgiMain, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (52, 30) cgiMain, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (50, 9) cgiMain, NarradarBenchmarkCGI(src/NarradarBenchmarkCGI.hs): (46, 11)
Sure, this is a nice functionality. But isn't it about debugging, not exception handling? Internal Server Error means to me, the server has a bug, thus we want to know, how to reproduce it, thus the stack trace. For handling expected irregularites, what exceptions are, you would not need that, right?
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