[erlang-questions] Architecture question: logging inside library

Max Lapshin <>
Mon Jan 11 08:34:22 CET 2016


Hi.

As we know, it is good when library doesn't have any hardcoded dependencies
at all.

I don't understand what is a good way to remove lager (or any other logging
library) from library dependencies.


For example, we have an mpegts decoder/encoder library. This library takes
binary and unpacks it to list of frames or packs back:

mpegts_decoder:decode(Binary,  mpegts_decoder:init(Options)) ->  {ok,
Frames, State}


There are calls to lager in some places of code that are used for
indicating some statuses:

dump_psi(Decoder, NewPMT),
lager:info("PMT: ~p", [Descriptors]),
...


What is the proper way to refuse from adding logger as a dependency for
such pure library?
Pass a callback into  initialisation options?
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