How to use the logger ? (solved)

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#How to use the logger ? (solved)

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kaxori 07/28/2023 08:01 AM

Where can I find an example or doc to learn the correct usage of the logging ?
The lib doc (https://libs.toit.io/log/library-summary) contains no application example.

What should be done to suppress all the info logs in an application ?

kaxori 07/28/2023 09:38 AM

A small example:

`import log

class Component:

logger /log.Logger

constructor
--logger /log.Logger = log.default:

logger
= logger

logger.debug "Component constructed"

use:
logger.debug "debug"
logger.info "info"
logger.warn "warning"
logger.error "error"
//logger.fatal "fatal" // exeption !

main:
5.repeat:
print "\nlog level: $it $(log.level_name it)"
logger ::= log.Logger it log.DefaultTarget --name="test"

component := Component --logger=logger
component.use

print "done"`

(edited)

kaxori 07/28/2023 09:39 AM

generates the output:

log level: 0 DEBUG [test] DEBUG: Component constructed [test] DEBUG: debug [test] INFO: info [test] WARN: warning [test] ERROR: error log level: 1 INFO [test] INFO: info [test] WARN: warning [test] ERROR: error log level: 2 WARN [test] WARN: warning [test] ERROR: error log level: 3 ERROR [test] ERROR: error log level: 4 FATAL done

(edited)

kaxori 07/28/2023 09:42 AM

my Conclusion:

the application defines the wanted log.level

logger ::= log.Logger logLevel

the logger is then chained to the used 'logging components'(edited)

floitsch 07/28/2023 10:16 AM

You can also set the default logger:

import log

main:
  log.set_default (log.default.with_level log.FATAL_LEVEL)

I will update the library documentation.

kaxori 07/28/2023 12:14 PM

Can I use a specific name in components for logging ?

floitsch 07/28/2023 12:32 PM

Yes.
https://github.com/toitlang/toit/pull/1717/files

Add comments to the logger library. by floitsch · Pull Request #171...

floitsch 07/28/2023 12:36 PM

Wait. There are a few mistakes

Fixing them right now.

floitsch 07/28/2023 12:37 PM

fixed.

kaxori 07/28/2023 02:34 PM

Thank you,
my logging example.

floitsch 07/28/2023 03:47 PM

looks good.

12 messages in total