forked from signal18/replication-manager
/
udp.go
243 lines (205 loc) · 5.12 KB
/
udp.go
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package receiver
import (
"bytes"
"io"
"net"
"strings"
"sync/atomic"
"time"
"github.com/signal18/replication-manager/graphite/helper"
"github.com/signal18/replication-manager/graphite/points"
"github.com/sirupsen/logrus"
)
// UDP receive metrics from UDP socket
type UDP struct {
helper.Stoppable
out func(*points.Points)
name string
metricsReceived uint32
incompleteReceived uint32
errors uint32
logIncomplete bool
conn *net.UDPConn
buffer chan *points.Points
}
// Name returns receiver name (for store internal metrics)
func (rcv *UDP) Name() string {
return rcv.name
}
type incompleteRecord struct {
deadline time.Time
data []byte
}
// incompleteStorage store incomplete lines
type incompleteStorage struct {
Records map[string]*incompleteRecord
Expires time.Duration
NextPurge time.Time
MaxSize int
}
func newIncompleteStorage() *incompleteStorage {
return &incompleteStorage{
Records: make(map[string]*incompleteRecord, 0),
Expires: 5 * time.Second,
MaxSize: 10000,
NextPurge: time.Now().Add(time.Second),
}
}
func (storage *incompleteStorage) store(addr string, data []byte) {
storage.Records[addr] = &incompleteRecord{
deadline: time.Now().Add(storage.Expires),
data: data,
}
storage.checkAndClear()
}
func (storage *incompleteStorage) pop(addr string) []byte {
if record, ok := storage.Records[addr]; ok {
delete(storage.Records, addr)
if record.deadline.Before(time.Now()) {
return nil
}
return record.data
}
return nil
}
func (storage *incompleteStorage) purge() {
now := time.Now()
for key, record := range storage.Records {
if record.deadline.Before(now) {
delete(storage.Records, key)
}
}
storage.NextPurge = time.Now().Add(time.Second)
}
func (storage *incompleteStorage) checkAndClear() {
if len(storage.Records) < storage.MaxSize {
return
}
if storage.NextPurge.After(time.Now()) {
return
}
storage.purge()
}
// Addr returns binded socket address. For bind port 0 in tests
func (rcv *UDP) Addr() net.Addr {
if rcv.conn == nil {
return nil
}
return rcv.conn.LocalAddr()
}
func logIncomplete(peer *net.UDPAddr, message []byte, lastLine []byte) {
p1 := bytes.IndexByte(message, 0xa) // find first "\n"
if p1 != -1 && p1+len(lastLine) < len(message)-10 { // print short version
logrus.Warningf(
"[udp] incomplete message from %s: \"%s\\n...(%d bytes)...\\n%s\"",
peer.String(),
string(message[:p1]),
len(message)-p1-len(lastLine)-2,
string(lastLine),
)
} else { // print full
logrus.Warningf(
"[udp] incomplete message from %s: %#v",
peer.String(),
string(message),
)
}
}
func (rcv *UDP) Stat(send helper.StatCallback) {
metricsReceived := atomic.LoadUint32(&rcv.metricsReceived)
atomic.AddUint32(&rcv.metricsReceived, -metricsReceived)
send("metricsReceived", float64(metricsReceived))
incompleteReceived := atomic.LoadUint32(&rcv.incompleteReceived)
atomic.AddUint32(&rcv.incompleteReceived, -incompleteReceived)
send("incompleteReceived", float64(incompleteReceived))
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)))
}
}
func (rcv *UDP) receiveWorker(exit chan bool) {
defer rcv.conn.Close()
var buf [65535]byte
var data *bytes.Buffer
lines := newIncompleteStorage()
for {
rlen, peer, err := rcv.conn.ReadFromUDP(buf[:])
if err != nil {
if strings.Contains(err.Error(), "use of closed network connection") {
break
}
atomic.AddUint32(&rcv.errors, 1)
logrus.Error(err)
continue
}
prev := lines.pop(peer.String())
if prev != nil {
data = bytes.NewBuffer(prev)
data.Write(buf[:rlen])
} else {
data = bytes.NewBuffer(buf[:rlen])
}
for {
line, err := data.ReadBytes('\n')
if err != nil {
if err == io.EOF {
if len(line) > 0 { // incomplete line received
if rcv.logIncomplete {
logIncomplete(peer, buf[:rlen], line)
}
lines.store(peer.String(), line)
atomic.AddUint32(&rcv.incompleteReceived, 1)
}
} 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)
}
}
}
}
}
// Listen bind port. Receive messages and send to out channel
func (rcv *UDP) Listen(addr *net.UDPAddr) error {
return rcv.StartFunc(func() error {
var err error
rcv.conn, err = net.ListenUDP("udp", addr)
if err != nil {
return err
}
rcv.Go(func(exit chan bool) {
<-exit
rcv.conn.Close()
})
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(rcv.receiveWorker)
return nil
})
}