co-log

Composable and configurable logging framework. The idea of the approach is described in the following blog post:

• co-log: Composable Contravariant Combinatorial Comonadic Configurable Convenient Logging

The repository contains two packages:

• co-log-core: lightweight package with basic data types and general idea.
• co-log: implementation of logging library based on co-log-core.

See How to start using co-log? for simple example of the co-log library usage.

Benchmarks

co-log is compared with basic functions like putStrLn. Since IO overhead is big enough, every benchmark dumps 10K messages to output. If benchmark name doesn't contain Message then this benchmark simply dumps string "message" to output, othwerwise it works with Message data type from the co-log library.

Benchmarks	Time
Prelude.putStrLn	5.358ms
Text.putStrLn	9.255ms
ByteString.putStrLn	2.970ms
mempty	1.229ms
logStringStdout	5.127ms
logPrint	5.163ms
logTextStdout	5.140ms
logByteStringStdout	3.931ms
logByteStringStderr	17.503ms
ByteString > (stdout <> stderr)	17.612ms
Message > format > stdout	9.367ms
Message > format > ByteString > stdout	2.994ms
Message{callstack} > format > stdout	9.367ms
Message{callstack:5} > format > stdout	9.441ms
Message{callstack:50} > format > stdout	9.305ms
Message{Time,ThreadId} > format > stdout	154.880ms