hnyLogger.go

package log

import (
	"io"

	libhoney "github.com/honeycombio/libhoney"
)

type hnyLogger struct {
}

// NewJSONLogger returns a Logger that encodes keyvals to the Writer as a
// single JSON object. Each log event produces no more than one call to
// w.Write. The passed Writer must be safe for concurrent use by multiple
// goroutines if the returned Logger will be used concurrently.
func NewHoneycombLogger(w io.Writer) Logger {
	return &hnyLogger{}
}

func (l *jsonLogger) Log(keyvals ...interface{}) error {
	ev := libhoney.NewEvent()
	defer ev.Send()
	n := (len(keyvals) + 1) / 2 // +1 to handle case when len is odd
	m := make(map[string]interface{}, n)
	for i := 0; i < len(keyvals); i += 2 {
		k := keyvals[i]
		var v interface{} = ErrMissingValue
		if i+1 < len(keyvals) {
			v = keyvals[i+1]
		}

		ev.AddField(k, v)
	}
	return nil
}