File size: 2,007 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | // Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package slog_test
import (
"log"
"log/slog"
"os"
)
// This example shows how to use slog.SetLogLoggerLevel to change the minimal level
// of the internal default handler for slog package before calling slog.SetDefault.
func ExampleSetLogLoggerLevel_log() {
defer log.SetFlags(log.Flags()) // revert changes after the example
log.SetFlags(0)
defer log.SetOutput(log.Writer()) // revert changes after the example
log.SetOutput(os.Stdout)
// Default logging level is slog.LevelInfo.
log.Print("log debug") // log debug
slog.Debug("debug") // no output
slog.Info("info") // INFO info
// Set the default logging level to slog.LevelDebug.
currentLogLevel := slog.SetLogLoggerLevel(slog.LevelDebug)
defer slog.SetLogLoggerLevel(currentLogLevel) // revert changes after the example
log.Print("log debug") // log debug
slog.Debug("debug") // DEBUG debug
slog.Info("info") // INFO info
// Output:
// log debug
// INFO info
// log debug
// DEBUG debug
// INFO info
}
// This example shows how to use slog.SetLogLoggerLevel to change the minimal level
// of the internal writer that uses the custom handler for log package after
// calling slog.SetDefault.
func ExampleSetLogLoggerLevel_slog() {
// Set the default logging level to slog.LevelError.
currentLogLevel := slog.SetLogLoggerLevel(slog.LevelError)
defer slog.SetLogLoggerLevel(currentLogLevel) // revert changes after the example
defer slog.SetDefault(slog.Default()) // revert changes after the example
removeTime := func(groups []string, a slog.Attr) slog.Attr {
if a.Key == slog.TimeKey && len(groups) == 0 {
return slog.Attr{}
}
return a
}
slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{ReplaceAttr: removeTime})))
log.Print("error") // level=ERROR msg=error
// Output:
// level=ERROR msg=error
}
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