/
slogger.go
65 lines (59 loc) · 1.45 KB
/
slogger.go
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package slogger
import (
"io"
"log/slog"
"os"
"testing"
"time"
"github.com/lmittmann/tint"
"github.com/mattn/go-isatty"
slogotel "github.com/remychantenay/slog-otel"
)
// Config holds package configuration.
type Config struct {
Debug bool `long:"debug" description:"Show debug info"`
Destination string `long:"dest" description:"Log destination (default: STDERR)"`
}
// Setup creates slog default logger.
func Setup(cfg Config, out io.Writer) error {
if out == nil {
if cfg.Destination == "" {
out = os.Stderr
} else {
var err error
out, err = os.OpenFile(cfg.Destination, os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
return err
}
}
}
var handler slog.Handler
if cfg.Debug {
if f, ok := out.(*os.File); ok && (isatty.IsTerminal(f.Fd()) || testing.Testing()) {
handler = tint.NewHandler(out, &tint.Options{
AddSource: true,
Level: slog.LevelDebug,
TimeFormat: time.Kitchen,
})
} else {
// out JSON if not inTerminal
handler = slog.NewJSONHandler(out, &slog.HandlerOptions{
AddSource: true,
Level: slog.LevelDebug,
})
}
} else {
handler = slog.NewJSONHandler(out, nil)
}
// Work when OTEL_EXPORTER_OTLP_ENDPOINT is set
handler = slogotel.OtelHandler{Next: handler}
slog.SetDefault(slog.New(handler))
return nil
}
// ErrAttr returns slog.Attr for err value.
func ErrAttr(err error) slog.Attr {
return slog.Attr{
Key: "error",
Value: slog.StringValue(err.Error()),
}
}