forked from go-graphite/go-carbon
/
udp.go
239 lines (200 loc) · 5.09 KB
/
udp.go
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package udp
import (
"bytes"
"fmt"
"io"
"net"
"strings"
"sync/atomic"
"go.uber.org/zap"
"github.com/lomik/go-carbon/helper"
"github.com/lomik/go-carbon/points"
"github.com/lomik/go-carbon/receiver"
"github.com/lomik/go-carbon/receiver/parse"
"github.com/lomik/zapwriter"
)
func init() {
receiver.Register(
"udp",
func() interface{} { return NewOptions() },
func(name string, options interface{}, store func(*points.Points)) (receiver.Receiver, error) {
return newUDP(name, options.(*Options), store)
},
)
}
type Options struct {
Listen string `toml:"listen"`
Enabled bool `toml:"enabled"`
LogIncomplete bool `toml:"log-incomplete"`
BufferSize int `toml:"buffer-size"`
}
// 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
logger *zap.Logger
}
func NewOptions() *Options {
return &Options{
Listen: ":2003",
Enabled: true,
LogIncomplete: false,
BufferSize: 0,
}
}
// 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 newUDP(name string, options *Options, store func(*points.Points)) (*UDP, error) {
if !options.Enabled {
return nil, nil
}
addr, err := net.ResolveUDPAddr("udp", options.Listen)
if err != nil {
return nil, err
}
r := &UDP{
out: store,
name: name,
logIncomplete: options.LogIncomplete,
logger: zapwriter.Logger(name),
}
if options.BufferSize > 0 {
r.buffer = make(chan *points.Points, options.BufferSize)
}
err = r.Listen(addr)
if err != nil {
return nil, err
}
return r, err
}
func logIncomplete(logger *zap.Logger, peer *net.UDPAddr, message []byte, lastLine []byte) {
p1 := bytes.IndexByte(message, 0xa) // find first "\n"
var m string
if p1 != -1 && p1+len(lastLine) < len(message)-10 { // print short version
m = fmt.Sprintf("%s\\n...(%d bytes)...\\n%s",
string(message[:p1]),
len(message)-p1-len(lastLine)-2,
string(lastLine),
)
} else { // print full
m = string(message)
}
logger.Warn("incomplete message",
zap.String("peer", peer.String()),
zap.String("message", m),
)
}
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)
rcv.logger.Error("read error", zap.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(rcv.logger, peer, buf[:rlen], line)
}
lines.store(peer.String(), line)
atomic.AddUint32(&rcv.incompleteReceived, 1)
}
} else {
atomic.AddUint32(&rcv.errors, 1)
rcv.logger.Error("read error", zap.Error(err))
}
break
}
if len(line) > 0 { // skip empty lines
name, value, timestamp, err := parse.PlainLine(line)
if err != nil {
atomic.AddUint32(&rcv.errors, 1)
rcv.logger.Info("parse failed",
zap.Error(err),
zap.String("peer", peer.String()),
)
} else {
atomic.AddUint32(&rcv.metricsReceived, 1)
rcv.out(points.OnePoint(string(name), value, timestamp))
}
}
}
}
}
// 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
})
}