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uds_datagram.go
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/
uds_datagram.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"
"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"
)
// UDSDatagramListener implements the StatsdListener interface for Unix Domain (datagrams)
type UDSDatagramListener struct {
UDSListener
conn *net.UnixConn
}
// NewUDSDatagramListener returns an idle UDS datagram Statsd listener
func NewUDSDatagramListener(packetOut chan packets.Packets, sharedPacketPoolManager *packets.PoolManager, sharedOobPoolManager *packets.PoolManager, cfg config.Reader, capture replay.Component, wmeta optional.Option[workloadmeta.Component], pidMap pidmap.Component) (*UDSDatagramListener, error) {
socketPath := cfg.GetString("dogstatsd_socket")
transport := "unixgram"
address, err := setupSocketBeforeListen(socketPath, transport)
if err != nil {
return nil, err
}
conn, err := net.ListenUnixgram(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, sharedOobPoolManager, cfg, capture, transport, wmeta, pidMap)
if err != nil {
return nil, err
}
listener := &UDSDatagramListener{
UDSListener: *l,
conn: conn,
}
// Setup origin detection early
l.OriginDetection, err = setupUnixConn(conn, l.OriginDetection, l.config)
if err != nil {
return nil, err
}
log.Infof("dogstatsd-uds: %s successfully initialized", conn.LocalAddr())
return listener, nil
}
// Listen runs the intake loop. Should be called in its own goroutine
func (l *UDSDatagramListener) Listen() {
l.listenWg.Add(1)
go func() {
defer l.listenWg.Done()
l.listen()
}()
}
func (l *UDSDatagramListener) listen() {
log.Infof("dogstatsd-uds: starting to listen on %s", l.conn.LocalAddr())
_ = l.handleConnection(l.conn, func(conn *net.UnixConn) error {
return conn.Close()
})
}
// Stop closes the UDS connection and stops listening
func (l *UDSDatagramListener) Stop() {
err := l.conn.Close()
if err != nil {
log.Errorf("dogstatsd-uds: error closing connection: %s", err)
}
l.UDSListener.Stop()
}