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// Copyright 2021 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 gokit provides a go-kit logger for events.
package gokit
import (
"context"
"fmt"
"github.com/go-kit/kit/log"
"golang.org/x/exp/event"
)
type logger struct {
}
// NewLogger returns a logger.
func NewLogger() log.Logger {
return &logger{}
}
// Log writes a structured log message.
// If the first argument is a context.Context, it is used
// to find the exporter to which to deliver the message.
// Otherwise, the default exporter is used.
func (l *logger) Log(keyvals ...interface{}) error {
ctx := context.Background()
if len(keyvals) > 0 {
if c, ok := keyvals[0].(context.Context); ok {
ctx = c
keyvals = keyvals[1:]
}
}
ev := event.New(ctx, event.LogKind)
if ev == nil {
return nil
}
var msg string
for i := 0; i < len(keyvals); i += 2 {
key := keyvals[i].(string)
value := keyvals[i+1]
if key == "msg" || key == "message" {
msg = fmt.Sprint(value)
} else {
ev.Labels = append(ev.Labels, event.Value(key, value))
}
}
ev.Labels = append(ev.Labels, event.String("msg", msg))
ev.Deliver()
return nil
}
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