Need examples of Action.warn etc. about lithoxyl HOT 4 OPEN

Hey Tom, thanks for your interest! You're spot on. For intermediate results, I am generally adding to the Action data map. Otherwise, I create new Actions (nested actions are fine). Actions keep a reference to their parent, though this is contingent on your concurrency model, I have only really leveraged that for indentation.

Warnings have not been fully fleshed out, and I wouldn't recommend them for successful intermediate results anyways. A while back I looked at supporting multiple Action completions, but decided that a single completion had more useful semantics, especially since Actions can be nested.

Have you considered a single-line action? Something like:

log.debug('dbg_action', res='intermediate').success('{res} intermediate result')

Compared to the built-in logging expressions, it's a bit noisier, but it's also a lot more structured.

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Thanks for the extra details @mahmoud.

I agree, you don't want multiple completions, that doesn't really make sense.

Nesting using a single-line action produces clean enough code that I'd be happy with, but I'm using a variant of the SyslogEmitter that only outputs the end_event, so the log entry for the intermediate result looks a bit odd, e.g. before I had output roughly like:

INFO starting some process
DEBUG intermediate result a
DEBUG another intermediate result b
INFO complete

And now I get:

DEBUG "intermediate result a"
DEBUG "another intermediate result b"
INFO "process succeeded"

It would be very instructive to see how you'd refactor some real-world code that has fairly extensive usage of logging.getLogger using lithoxyl.

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Sure! So, for sure this is one of the most immediate friction points one would hit, especially coming from logging. I've yet to have project that didn't have some long-running task that I wanted some confirmation of having started. Lithoxyl has begin events, the question is when to emit them. There's not really a way where a parent can know it will have a nested event, or that it will be a long-running task, so we have to compromise and be able to mark these ourself.

There are two approaches I use:

1. Emit begin events for transactions marked as verbose.
2. Emit begin events for transactions with above a certain level (e.g., >debug in your case)

You can see the first approach in action in Chert. Note the separate complete format (fmt) and begin format (begin_fmt). This gives an output like:

b+0.277090 --------------    "render site beginning"
F+0.277154 -    0.008ms -       "no pre_render hook defined"
b+0.278630 --------------       "render published entry content beginning"
S+1.213840 -  935.210ms -       "render published entry content succeeded - ({'verbose': True})"
b+1.214119 --------------       "render draft entry content beginning"
S+2.776296 - 1562.177ms -       "render draft entry content succeeded - ({'verbose': True})"
b+2.776552 --------------       "render special entry content beginning"
S+2.787829 -   11.277ms -       "render special entry content succeeded - ({'verbose': True})"
S+2.826007 -   37.902ms -       "render entry html succeeded"
S+2.891567 -   65.425ms -       "render feed and tag lists succeeded"
S+2.892354 - 2615.264ms -    "render site succeeded - ({'verbose': True})"

I'm not super happy about the ({'verbose': True}), but it works pretty well thus far. Enough so that I've made verbose a special part of SensibleFilter.

How's that sounding?

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Yes, that's pretty good, thanks. Real-world example code is always helpful.

Agreed re verbose, maybe there's a way to filter that out of SensibleFormatter/SensibleMessageFormatter?

It seems to me there's room for lithoxyl to get a bit more opinionated about the "sensible" setup too - e.g. with a couple of pre-built sinks for stderr, syslog etc. that can be added to a Logger with a line or two of code to reduce the friction when getting started. I had a question on StackOverflow about creating an emitter that outputs to the logging module, similar to the SyslogEmitter, that may fit into that pre-rolled sink category too.

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