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statter.go
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/
statter.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
"time"
"github.com/cactus/go-statsd-client/statsd"
)
// fileSender is an adapter from io.WriteCloser to statsd.Sender
type fileSender struct {
bufWriter *bufio.Writer
closer io.Closer
}
// Send implements the statsd.Sender interface
func (fs *fileSender) Send(data []byte) (int, error) {
line := fmt.Sprintf("%s: %s\n", time.Now().UTC().Format(time.RFC3339Nano), data)
_, err := fs.bufWriter.Write([]byte(line))
// Because we're changing the underlying bytes sent, make sure:
// written == len(data) on success
// written < len(data) on error
if err != nil {
return 0, err
}
return len(data), nil
}
// Close implements the statsd.Sender interface
func (fs *fileSender) Close() error {
err := fs.bufWriter.Flush()
fs.closer.Close()
return err
}
// newFileSender returns a new fileSender
func newFileSender(wc io.WriteCloser) *fileSender {
return &fileSender{
bufWriter: bufio.NewWriter(wc),
closer: wc}
}
// NewFileStatsd returns a statsd.Statter that writes to file. Each entry is
// prefixed by a date/time with nanosecond resolution on it's own line
func NewFileStatsd(name string) (statsd.Statter, error) {
f, err := os.Create(name)
if err != nil {
return nil, err
}
fileSender := newFileSender(f)
c, err := statsd.NewClientWithSender(fileSender, "")
if err != nil {
return nil, err
}
return c, nil
}