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tcp.go
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tcp.go
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package receiver
import (
"bufio"
"encoding/binary"
"io"
"net"
"strings"
"sync/atomic"
"time"
"github.com/signal18/replication-manager/graphite/helper"
"github.com/signal18/replication-manager/graphite/helper/framing"
"github.com/signal18/replication-manager/graphite/points"
"github.com/sirupsen/logrus"
)
// TCP receive metrics from TCP connections
type TCP struct {
helper.Stoppable
out func(*points.Points)
name string // name for store metrics
maxPickleMessageSize uint32
metricsReceived uint32
errors uint32
active int32 // counter
listener *net.TCPListener
isPickle bool
buffer chan *points.Points
}
// Name returns receiver name (for store internal metrics)
func (rcv *TCP) Name() string {
return rcv.name
}
// Addr returns binded socket address. For bind port 0 in tests
func (rcv *TCP) Addr() net.Addr {
if rcv.listener == nil {
return nil
}
return rcv.listener.Addr()
}
func (rcv *TCP) HandleConnection(conn net.Conn) {
atomic.AddInt32(&rcv.active, 1)
defer atomic.AddInt32(&rcv.active, -1)
defer conn.Close()
reader := bufio.NewReader(conn)
finished := make(chan bool)
defer close(finished)
rcv.Go(func(exit chan bool) {
select {
case <-finished:
return
case <-exit:
conn.Close()
return
}
})
for {
conn.SetReadDeadline(time.Now().Add(2 * time.Minute))
line, err := reader.ReadBytes('\n')
if err != nil {
if err == io.EOF {
if len(line) > 0 {
logrus.Warningf("[tcp] Unfinished line: %#v", line)
}
} else {
atomic.AddUint32(&rcv.errors, 1)
logrus.Error(err)
}
break
}
if len(line) > 0 { // skip empty lines
if msg, err := points.ParseText(string(line)); err != nil {
atomic.AddUint32(&rcv.errors, 1)
logrus.Info(err)
} else {
atomic.AddUint32(&rcv.metricsReceived, 1)
rcv.out(msg)
}
}
}
}
func (rcv *TCP) handlePickle(conn net.Conn) {
framedConn, _ := framing.NewConn(conn, byte(4), binary.BigEndian)
defer func() {
if r := recover(); r != nil {
logrus.Errorf("[pickle] Unknown error recovered: %s", r)
}
}()
atomic.AddInt32(&rcv.active, 1)
defer atomic.AddInt32(&rcv.active, -1)
defer conn.Close()
finished := make(chan bool)
defer close(finished)
rcv.Go(func(exit chan bool) {
select {
case <-finished:
return
case <-exit:
conn.Close()
return
}
})
framedConn.MaxFrameSize = uint(rcv.maxPickleMessageSize)
for {
conn.SetReadDeadline(time.Now().Add(2 * time.Minute))
data, err := framedConn.ReadFrame()
if err == framing.ErrPrefixLength {
atomic.AddUint32(&rcv.errors, 1)
logrus.Warningf("[pickle] Bad message size")
return
} else if err != nil {
atomic.AddUint32(&rcv.errors, 1)
logrus.Warningf("[pickle] Can't read message body: %s", err.Error())
return
}
msgs, err := points.ParsePickle(data)
if err != nil {
atomic.AddUint32(&rcv.errors, 1)
logrus.Infof("[pickle] Can't unpickle message: %s", err.Error())
logrus.Debugf("[pickle] Bad message: %#v", string(data))
return
}
for _, msg := range msgs {
atomic.AddUint32(&rcv.metricsReceived, uint32(len(msg.Data)))
rcv.out(msg)
}
}
}
func (rcv *TCP) Stat(send helper.StatCallback) {
metricsReceived := atomic.LoadUint32(&rcv.metricsReceived)
atomic.AddUint32(&rcv.metricsReceived, -metricsReceived)
send("metricsReceived", float64(metricsReceived))
active := float64(atomic.LoadInt32(&rcv.active))
send("active", active)
errors := atomic.LoadUint32(&rcv.errors)
atomic.AddUint32(&rcv.errors, -errors)
send("errors", float64(errors))
if rcv.buffer != nil {
send("bufferLen", float64(len(rcv.buffer)))
send("bufferCap", float64(cap(rcv.buffer)))
}
}
// Listen bind port. Receive messages and send to out channel
func (rcv *TCP) Listen(addr *net.TCPAddr) error {
return rcv.StartFunc(func() error {
tcpListener, err := net.ListenTCP("tcp", addr)
if err != nil {
return err
}
rcv.Go(func(exit chan bool) {
<-exit
tcpListener.Close()
})
handler := rcv.HandleConnection
if rcv.isPickle {
handler = rcv.handlePickle
}
if rcv.buffer != nil {
originalOut := rcv.out
rcv.Go(func(exit chan bool) {
for {
select {
case <-exit:
return
case p := <-rcv.buffer:
originalOut(p)
}
}
})
rcv.out = func(p *points.Points) {
rcv.buffer <- p
}
}
rcv.Go(func(exit chan bool) {
defer tcpListener.Close()
for {
conn, err := tcpListener.Accept()
if err != nil {
if strings.Contains(err.Error(), "use of closed network connection") {
break
}
logrus.Warningf("[tcp] Failed to accept connection: %s", err)
continue
}
rcv.Go(func(exit chan bool) {
handler(conn)
})
}
})
rcv.listener = tcpListener
return nil
})
}