mirror of https://github.com/status-im/consul.git
74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package statsd
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
autoHostEnvName = "DD_AGENT_HOST"
|
|
autoPortEnvName = "DD_DOGSTATSD_PORT"
|
|
defaultUDPPort = "8125"
|
|
)
|
|
|
|
// udpWriter is an internal class wrapping around management of UDP connection
|
|
type udpWriter struct {
|
|
conn net.Conn
|
|
}
|
|
|
|
// New returns a pointer to a new udpWriter given an addr in the format "hostname:port".
|
|
func newUDPWriter(addr string) (*udpWriter, error) {
|
|
if addr == "" {
|
|
addr = addressFromEnvironment()
|
|
}
|
|
if addr == "" {
|
|
return nil, errors.New("No address passed and autodetection from environment failed")
|
|
}
|
|
|
|
udpAddr, err := net.ResolveUDPAddr("udp", addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
conn, err := net.DialUDP("udp", nil, udpAddr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
writer := &udpWriter{conn: conn}
|
|
return writer, nil
|
|
}
|
|
|
|
// SetWriteTimeout is not needed for UDP, returns error
|
|
func (w *udpWriter) SetWriteTimeout(d time.Duration) error {
|
|
return errors.New("SetWriteTimeout: not supported for UDP connections")
|
|
}
|
|
|
|
// Write data to the UDP connection with no error handling
|
|
func (w *udpWriter) Write(data []byte) (int, error) {
|
|
return w.conn.Write(data)
|
|
}
|
|
|
|
func (w *udpWriter) Close() error {
|
|
return w.conn.Close()
|
|
}
|
|
|
|
func (w *udpWriter) remoteAddr() net.Addr {
|
|
return w.conn.RemoteAddr()
|
|
}
|
|
|
|
func addressFromEnvironment() string {
|
|
autoHost := os.Getenv(autoHostEnvName)
|
|
if autoHost == "" {
|
|
return ""
|
|
}
|
|
|
|
autoPort := os.Getenv(autoPortEnvName)
|
|
if autoPort == "" {
|
|
autoPort = defaultUDPPort
|
|
}
|
|
|
|
return fmt.Sprintf("%s:%s", autoHost, autoPort)
|
|
}
|