/
uds_stream.go
104 lines (89 loc) · 2.95 KB
/
uds_stream.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
package listeners
import (
"fmt"
"net"
"strings"
"time"
"github.com/DataDog/datadog-agent/comp/core/workloadmeta"
"github.com/DataDog/datadog-agent/comp/dogstatsd/packets"
"github.com/DataDog/datadog-agent/comp/dogstatsd/pidmap"
"github.com/DataDog/datadog-agent/comp/dogstatsd/replay"
"github.com/DataDog/datadog-agent/pkg/config"
"github.com/DataDog/datadog-agent/pkg/util/log"
"github.com/DataDog/datadog-agent/pkg/util/optional"
)
// UDSStreamListener implements the StatsdListener interface for Unix Domain (streams)
type UDSStreamListener struct {
UDSListener
connTracker *ConnectionTracker
conn *net.UnixListener
}
// NewUDSStreamListener returns an idle UDS datagram Statsd listener
func NewUDSStreamListener(packetOut chan packets.Packets, sharedPacketPoolManager *packets.PoolManager, sharedOobPacketPoolManager *packets.PoolManager, cfg config.Reader, capture replay.Component, wmeta optional.Option[workloadmeta.Component], pidMap pidmap.Component) (*UDSStreamListener, error) {
socketPath := cfg.GetString("dogstatsd_stream_socket")
transport := "unix"
address, err := setupSocketBeforeListen(socketPath, transport)
if err != nil {
return nil, err
}
conn, err := net.ListenUnix(transport, address)
if err != nil {
return nil, fmt.Errorf("can't listen: %s", err)
}
err = setSocketWriteOnly(socketPath)
if err != nil {
return nil, err
}
l, err := NewUDSListener(packetOut, sharedPacketPoolManager, sharedOobPacketPoolManager, cfg, capture, transport, wmeta, pidMap)
if err != nil {
return nil, err
}
listener := &UDSStreamListener{
UDSListener: *l,
connTracker: NewConnectionTracker(transport, 1*time.Second),
conn: conn,
}
log.Infof("dogstatsd-uds-stream: %s successfully initialized", conn.Addr())
return listener, nil
}
// Listen runs the intake loop. Should be called in its own goroutine
func (l *UDSStreamListener) Listen() {
l.listenWg.Add(1)
go func() {
defer l.listenWg.Done()
l.listen()
}()
}
func (l *UDSStreamListener) listen() {
l.connTracker.Start()
log.Infof("dogstatsd-uds-stream: starting to listen on %s", l.conn.Addr())
for {
conn, err := l.conn.AcceptUnix()
if err != nil {
if !strings.HasSuffix(err.Error(), " use of closed network connection") {
log.Errorf("dogstatsd-uds: error accepting connection: %v", err)
}
break
}
go func() {
l.connTracker.Track(conn)
_ = l.handleConnection(conn, func(c *net.UnixConn) error {
l.connTracker.Close(c)
return nil
})
if err != nil {
log.Errorf("dogstatsd-uds-stream: error handling connection: %v", err)
}
}()
}
}
// Stop closes the UDS connection and stops listening
func (l *UDSStreamListener) Stop() {
_ = l.conn.Close()
l.connTracker.Stop()
l.UDSListener.Stop()
}