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listener.go
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listener.go
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// Copyright 2013 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package listener
import (
"bufio"
"io"
"net"
"os"
"strings"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/statsd_exporter/pkg/event"
)
type Parser interface {
LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger log.Logger) event.Events
}
type StatsDUDPListener struct {
Conn *net.UDPConn
EventHandler event.EventHandler
Logger log.Logger
LineParser Parser
UDPPackets prometheus.Counter
LinesReceived prometheus.Counter
EventsFlushed prometheus.Counter
SampleErrors prometheus.CounterVec
SamplesReceived prometheus.Counter
TagErrors prometheus.Counter
TagsReceived prometheus.Counter
}
func (l *StatsDUDPListener) SetEventHandler(eh event.EventHandler) {
l.EventHandler = eh
}
func (l *StatsDUDPListener) Listen() {
buf := make([]byte, 65535)
for {
n, _, err := l.Conn.ReadFromUDP(buf)
if err != nil {
// https://github.com/golang/go/issues/4373
// ignore net: errClosing error as it will occur during shutdown
if strings.HasSuffix(err.Error(), "use of closed network connection") {
return
}
level.Error(l.Logger).Log("error", err)
return
}
l.HandlePacket(buf[0:n])
}
}
func (l *StatsDUDPListener) HandlePacket(packet []byte) {
l.UDPPackets.Inc()
lines := strings.Split(string(packet), "\n")
for _, line := range lines {
level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "udp", "line", line)
l.LinesReceived.Inc()
l.EventHandler.Queue(l.LineParser.LineToEvents(line, l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
}
}
type StatsDTCPListener struct {
Conn *net.TCPListener
EventHandler event.EventHandler
Logger log.Logger
LineParser Parser
LinesReceived prometheus.Counter
EventsFlushed prometheus.Counter
SampleErrors prometheus.CounterVec
SamplesReceived prometheus.Counter
TagErrors prometheus.Counter
TagsReceived prometheus.Counter
TCPConnections prometheus.Counter
TCPErrors prometheus.Counter
TCPLineTooLong prometheus.Counter
}
func (l *StatsDTCPListener) SetEventHandler(eh event.EventHandler) {
l.EventHandler = eh
}
func (l *StatsDTCPListener) Listen() {
for {
c, err := l.Conn.AcceptTCP()
if err != nil {
// https://github.com/golang/go/issues/4373
// ignore net: errClosing error as it will occur during shutdown
if strings.HasSuffix(err.Error(), "use of closed network connection") {
return
}
level.Error(l.Logger).Log("msg", "AcceptTCP failed", "error", err)
os.Exit(1)
}
go l.HandleConn(c)
}
}
func (l *StatsDTCPListener) HandleConn(c *net.TCPConn) {
defer c.Close()
l.TCPConnections.Inc()
r := bufio.NewReader(c)
for {
line, isPrefix, err := r.ReadLine()
if err != nil {
if err != io.EOF {
l.TCPErrors.Inc()
level.Debug(l.Logger).Log("msg", "Read failed", "addr", c.RemoteAddr(), "error", err)
}
break
}
level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "tcp", "line", line)
if isPrefix {
l.TCPLineTooLong.Inc()
level.Debug(l.Logger).Log("msg", "Read failed: line too long", "addr", c.RemoteAddr())
break
}
l.LinesReceived.Inc()
l.EventHandler.Queue(l.LineParser.LineToEvents(string(line), l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
}
}
type StatsDUnixgramListener struct {
Conn *net.UnixConn
EventHandler event.EventHandler
Logger log.Logger
LineParser Parser
UnixgramPackets prometheus.Counter
LinesReceived prometheus.Counter
EventsFlushed prometheus.Counter
SampleErrors prometheus.CounterVec
SamplesReceived prometheus.Counter
TagErrors prometheus.Counter
TagsReceived prometheus.Counter
}
func (l *StatsDUnixgramListener) SetEventHandler(eh event.EventHandler) {
l.EventHandler = eh
}
func (l *StatsDUnixgramListener) Listen() {
buf := make([]byte, 65535)
for {
n, _, err := l.Conn.ReadFromUnix(buf)
if err != nil {
// https://github.com/golang/go/issues/4373
// ignore net: errClosing error as it will occur during shutdown
if strings.HasSuffix(err.Error(), "use of closed network connection") {
return
}
level.Error(l.Logger).Log(err)
os.Exit(1)
}
l.HandlePacket(buf[:n])
}
}
func (l *StatsDUnixgramListener) HandlePacket(packet []byte) {
l.UnixgramPackets.Inc()
lines := strings.Split(string(packet), "\n")
for _, line := range lines {
level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "unixgram", "line", line)
l.LinesReceived.Inc()
l.EventHandler.Queue(l.LineParser.LineToEvents(line, l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
}
}