18 Logging
| (require koyo/logging) | package: koyo-lib |
This module provides utilities for displaying log messages.
procedure
(start-logger #:levels levels [ #:color? color? #:parent parent #:place-id place-id #:output-port out]) → (-> void?) levels : (listof (cons/c symbol? log-level/c)) color? : boolean? = #t parent : logger? = (current-logger) place-id : #f = (or/c #f exact-nonnegative-integer?) out : port? = (current-error-port)
Starts a background thread that receives logs based on levels
and writes them to out in the following format:
[<timestamp>] [<process-id>] [<level>] <topic>: <message>
When a #:place-id argument is provided, the format changes to:
[<timestamp>] [<process-id>] [<place-id>] [<level>] <topic>: <message>
The levels argument is a list of topic and level pairs. The debug, info, warning and error <level>s are colored using ANSI escape sequences unless #:color? is #f.
The return value is a procedure that will stop the background thread when called. Calling the stopper procedure after the thread has been stopped has no effect.
Changed in version 0.31 of package koyo-lib: Added the #:place-id argument.