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// Copyright (c) 2012-2016 Eli Janssen
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package statsd
import (
"errors"
"net"
)
// The Sender interface wraps a Send and Close
type Sender interface {
Send(data []byte) (int, error)
Close() error
}
// SimpleSender provides a socket send interface.
type SimpleSender struct {
// underlying connection
c net.PacketConn
// resolved udp address
ra *net.UDPAddr
}
// Send sends the data to the server endpoint.
func (s *SimpleSender) Send(data []byte) (int, error) {
// no need for locking here, as the underlying fdNet
// already serialized writes
n, err := s.c.(*net.UDPConn).WriteToUDP(data, s.ra)
if err != nil {
return 0, err
}
if n == 0 {
return n, errors.New("Wrote no bytes")
}
return n, nil
}
// Close closes the SimpleSender and cleans up.
func (s *SimpleSender) Close() error {
err := s.c.Close()
return err
}
// NewSimpleSender returns a new SimpleSender for sending to the supplied
// addresss.
//
// addr is a string of the format "hostname:port", and must be parsable by
// net.ResolveUDPAddr.
func NewSimpleSender(addr string) (Sender, error) {
c, err := net.ListenPacket("udp", ":0")
if err != nil {
return nil, err
}
ra, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
c.Close()
return nil, err
}
sender := &SimpleSender{
c: c,
ra: ra,
}
return sender, nil
}
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