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