mirror of https://github.com/hashicorp/consul
37 lines
1000 B
Markdown
37 lines
1000 B
Markdown
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# logutils
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logutils is a Go package that augments the standard library "log" package
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to make logging a bit more modern, without fragmenting the Go ecosystem
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with new logging packages.
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## The simplest thing that could possibly work
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Presumably your application already uses the default `log` package. To switch, you'll want your code to look like the following:
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```go
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package main
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import (
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"log"
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"os"
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"github.com/hashicorp/logutils"
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)
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func main() {
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filter := &logutils.LevelFilter{
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Levels: []logutils.LogLevel{"DEBUG", "WARN", "ERROR"},
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MinLevel: logutils.LogLevel("WARN"),
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Writer: os.Stderr,
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}
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log.SetOutput(filter)
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log.Print("[DEBUG] Debugging") // this will not print
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log.Print("[WARN] Warning") // this will
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log.Print("[ERROR] Erring") // and so will this
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log.Print("Message I haven't updated") // and so will this
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}
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```
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This logs to standard error exactly like go's standard logger. Any log messages you haven't converted to have a level will continue to print as before.
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