postfinance / flash

Configures an opinionated zap logger.

flash

Creates an opinionated zap logger.

Adapting it as a logr.Logger instance

Shall you at some point need to pass a logr.Logger instance in your code, e.g. while writing code that uses the Kubernetes client library etc., you can use go-logr/zapr to wrap the logger, as follows:

package main

import (
	"github.com/go-logr/zapr"
	"github.com/postfinance/flash"
)

func main() {
	l := flash.New()
	z := zapr.NewLogger(l.Desugar())
        z.V(0).Info("I'm a zap logger complying with logr.Logger interface !")
}

Logger Without Stacktrace

New Logger

Debug / Info / Error

2020-10-09T09:29:06.363+0200    INFO    test/main.go:26 message {"StackTrace": "off", "debug": false}
2020-10-09T09:29:06.364+0200    ERROR   test/main.go:27 message {"StackTrace": "off", "debug": false}

Enable Debug

Debug / Info / Error

2020-10-09T09:29:06.364+0200    DEBUG   test/main.go:33 message {"StackTrace": "off", "debug": true}
2020-10-09T09:29:06.364+0200    INFO    test/main.go:34 message {"StackTrace": "off", "debug": true}
2020-10-09T09:29:06.364+0200    ERROR   test/main.go:35 message {"StackTrace": "off", "debug": true}

Disable Debug

Debug / Info / Error

2020-10-09T09:29:06.364+0200    INFO    test/main.go:42 message {"StackTrace": "off", "debug": false}
2020-10-09T09:29:06.364+0200    ERROR   test/main.go:43 message {"StackTrace": "off", "debug": false}

Fatal

2020-10-09T09:29:06.364+0200    FATAL   test/main.go:47 message {"StackTrace": "on", "debug": false}
exit status 1

Logger With Stacktrace

New Logger

Debug / Info / Error

2020-10-09T09:29:11.889+0200    INFO    test/main.go:26 message {"StackTrace": "off", "debug": false}
2020-10-09T09:29:11.889+0200    ERROR   test/main.go:27 message {"StackTrace": "off", "debug": false}

Enable Debug (Stacktrace on Error or above)

Debug / Info / Error

2020-10-09T09:29:11.889+0200    DEBUG   test/main.go:33 message {"StackTrace": "off", "debug": true}
2020-10-09T09:29:11.889+0200    INFO    test/main.go:34 message {"StackTrace": "off", "debug": true}
2020-10-09T09:29:11.889+0200    ERROR   test/main.go:35 message {"StackTrace": "off", "debug": true}
main.main
        /export/home/sauterm/tmp/test/main.go:35
runtime.main
        /export/home/sauterm/.gimme/versions/go1.15.2.linux.amd64/src/runtime/proc.go:204

Disable Debug (Stacktrace on Fatal only)

Debug / Info / Error

2020-10-09T09:29:11.889+0200    INFO    test/main.go:42 message {"StackTrace": "off", "debug": false}
2020-10-09T09:29:11.889+0200    ERROR   test/main.go:43 message {"StackTrace": "off", "debug": false}

Fatal

2020-10-09T09:29:11.889+0200    FATAL   test/main.go:47 message {"StackTrace": "on", "debug": false}
main.main
        /export/home/sauterm/tmp/test/main.go:47
runtime.main
        /export/home/sauterm/.gimme/versions/go1.15.2.linux.amd64/src/runtime/proc.go:204
exit status 1