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