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raven.go
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raven.go
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// Copyright 2014 Simon Zimmermann. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package log
import (
"errors"
"log"
"os"
"github.com/simonz05/util/raven"
)
type ravenLogger struct {
l *log.Logger
sev Level
dsn string
}
func (r *ravenLogger) Output(calldepth int, s string, sev Level) error {
if r.sev < sev {
return nil
}
if r.l == nil {
r.init()
}
return r.l.Output(calldepth, s)
}
func (r *ravenLogger) init() {
c, err := raven.NewClient(r.dsn, "")
if err != nil {
os.Stderr.Write([]byte(err.Error()))
os.Exit(1)
}
r.l = log.New(newRavenWriter(c), "", log.Lshortfile)
}
type ravenWriter struct {
c *raven.Client
in chan []byte
}
func newRavenWriter(c *raven.Client) *ravenWriter {
w := &ravenWriter{
in: make(chan []byte, 32),
c: c,
}
go func() {
w.process()
}()
return w
}
func (w *ravenWriter) process() {
for {
select {
case buf, ok := <-w.in:
if !ok {
return
}
err := w.c.Error(string(buf))
if err != nil {
os.Stderr.Write([]byte(err.Error()))
}
}
}
}
// Write implements the io.Writer interface
func (w *ravenWriter) Write(p []byte) (int, error) {
select {
case w.in <- p:
return len(p), nil
default:
return 0, errors.New("err chan is full")
}
}