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levels.go
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levels.go
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// Initially from https://github.com/fortio/logc/blob/v1.1.0/levelsDemo/levels.go
package main
import (
"fmt"
"fortio.org/log"
)
func main() {
log.SetLogLevelQuiet(log.Debug)
log.Config.LogFileAndLine = false
log.Config.LogPrefix = ""
log.Config.GoroutineID = false
log.Debugf("This is a debug message without goroutine id, file:line nor prefix (cli style)")
log.Config = log.DefaultConfig()
// So log fatal doesn't panic nor exit (so we can print the non-JSON last line).
log.Config.FatalPanics = false
log.Config.FatalExit = func(int) {}
// Meat of the example: (some of these are reproducing fixed issues in `logc` JSON->console attributes detection)
log.Debugf("Back to default (server) logging style with a debug message ending with backslash \\")
log.LogVf("This is a verbose message")
log.Printf("This an always printed, file:line omitted message (and no level in console)")
log.Infof("This is an info message with no attributes but with \"quotes\"...")
log.S(log.Info, "This is multi line\n\tstructured info message with 3 attributes",
log.Str("attr1", "value1"), log.Attr("attr2", 42), log.Str("attr3", "\"quoted\nvalue\""))
log.Warnf("This is a warning message")
log.Errf("This is an error message")
log.Critf("This is a critical message")
log.Fatalf("This is a fatal message") //nolint:revive // we disabled exit for this demo
fmt.Println("This is a non-JSON output, will get prefixed with a exclamation point with logc")
}