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tcp.go
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tcp.go
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package tcp
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"net"
"strings"
"sync/atomic"
"time"
"go.uber.org/zap"
"github.com/klauspost/compress/gzip"
"github.com/klauspost/compress/snappy"
"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/graphite-pickle/framing"
"github.com/lomik/zapwriter"
)
func init() {
receiver.Register(
"tcp",
func() interface{} { return NewOptions() },
func(name string, options interface{}, store func(*points.Points)) (receiver.Receiver, error) {
return newTCP(name, options.(*Options), store)
},
)
receiver.Register(
"pickle",
func() interface{} { return NewFramingOptions() },
func(name string, options interface{}, store func(*points.Points)) (receiver.Receiver, error) {
return newFraming("pickle", name, options.(*FramingOptions), store)
},
)
receiver.Register(
"protobuf",
func() interface{} { return NewFramingOptions() },
func(name string, options interface{}, store func(*points.Points)) (receiver.Receiver, error) {
return newFraming("protobuf", name, options.(*FramingOptions), store)
},
)
}
type Options struct {
Listen string `toml:"listen"`
Enabled bool `toml:"enabled"`
BufferSize int `toml:"buffer-size"`
Compression string `toml:"compression"`
}
func NewOptions() *Options {
return &Options{
Listen: ":2003",
Enabled: true,
BufferSize: 0,
}
}
type FramingOptions struct {
Listen string `toml:"listen"`
MaxMessageSize uint32 `toml:"max-message-size"`
Enabled bool `toml:"enabled"`
BufferSize int `toml:"buffer-size"`
}
func NewFramingOptions() *FramingOptions {
return &FramingOptions{
Listen: ":2004",
MaxMessageSize: 67108864, // 64 Mb
Enabled: true,
BufferSize: 0,
}
}
// TCP receive metrics from TCP connections
type TCP struct {
helper.Stoppable
out func(*points.Points)
name string // name for store metrics
maxMessageSize uint32
metricsReceived uint32
errors uint32
active int32 // counter
listener *net.TCPListener
isFraming bool
frameParser func(body []byte) ([]*points.Points, error)
buffer chan *points.Points
logger *zap.Logger
decompressor decompressor
}
// 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 newTCP(name string, options *Options, store func(*points.Points)) (*TCP, error) {
if !options.Enabled {
return nil, nil
}
addr, err := net.ResolveTCPAddr("tcp", options.Listen)
if err != nil {
return nil, err
}
r := &TCP{
out: store,
name: name,
logger: zapwriter.Logger(name),
}
if options.BufferSize > 0 {
r.buffer = make(chan *points.Points, options.BufferSize)
}
r.decompressor = newDecompressor(options.Compression)
err = r.Listen(addr)
if err != nil {
return nil, err
}
return r, err
}
func newFraming(parser string, name string, options *FramingOptions, store func(*points.Points)) (*TCP, error) {
if !options.Enabled {
return nil, nil
}
addr, err := net.ResolveTCPAddr("tcp", options.Listen)
if err != nil {
return nil, err
}
r := &TCP{
out: store,
name: name,
logger: zapwriter.Logger(name),
maxMessageSize: options.MaxMessageSize,
isFraming: true,
}
switch parser {
case "pickle":
r.frameParser = parse.Pickle
case "protobuf":
r.frameParser = parse.Protobuf
default:
return nil, fmt.Errorf("unknown frame parser %#v", parser)
}
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 (rcv *TCP) HandleConnection(conn net.Conn) {
atomic.AddInt32(&rcv.active, 1)
defer atomic.AddInt32(&rcv.active, -1)
defer conn.Close()
bconn, err := rcv.decompressor(conn)
if err != nil {
rcv.logger.Error("failed init decompressor", zap.Error(err))
return
}
reader := bufio.NewReader(bconn)
finished := make(chan bool)
defer close(finished)
rcv.Go(func(exit chan bool) {
select {
case <-finished:
return
case <-exit:
conn.Close()
return
}
})
lastDeadline := time.Now()
readTimeout := 2 * time.Minute
conn.SetReadDeadline(lastDeadline.Add(readTimeout))
for {
now := time.Now()
if now.Sub(lastDeadline) > (readTimeout / 4) {
conn.SetReadDeadline(now.Add(readTimeout))
lastDeadline = now
}
line, err := reader.ReadBytes('\n')
if err != nil {
if err == io.EOF {
if len(line) > 0 {
rcv.logger.Warn("unfinished line", zap.String("line", string(line)))
}
} 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", conn.RemoteAddr().String()),
)
} else {
atomic.AddUint32(&rcv.metricsReceived, 1)
rcv.out(points.OnePoint(string(name), value, timestamp))
}
}
}
}
func (rcv *TCP) handleFraming(conn net.Conn) {
framedConn, _ := framing.NewConn(conn, byte(4), binary.BigEndian)
defer func() {
if r := recover(); r != nil {
rcv.logger.Error("panic recovered", zap.String("traceback", fmt.Sprint(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.maxMessageSize)
for {
conn.SetReadDeadline(time.Now().Add(2 * time.Minute))
data, err := framedConn.ReadFrame()
if err == io.EOF {
return
} else if err == framing.ErrPrefixLength {
atomic.AddUint32(&rcv.errors, 1)
rcv.logger.Warn("bad message size")
return
} else if err != nil {
atomic.AddUint32(&rcv.errors, 1)
rcv.logger.Warn("can't read message body", zap.Error(err))
return
}
msgs, err := rcv.frameParser(data)
if err != nil {
atomic.AddUint32(&rcv.errors, 1)
rcv.logger.Info("can't parse message",
zap.String("data", string(data)),
zap.Error(err),
)
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.isFraming {
handler = rcv.handleFraming
}
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
}
rcv.logger.Warn("failed to accept connection",
zap.Error(err),
)
continue
}
rcv.Go(func(exit chan bool) {
handler(conn)
})
}
})
rcv.listener = tcpListener
return nil
})
}
type decompressor func(net.Conn) (io.Reader, error)
func newDecompressor(typ string) decompressor {
switch typ {
case "snappy":
return func(c net.Conn) (io.Reader, error) {
return snappy.NewReader(c), nil
}
case "gzip":
return func(c net.Conn) (io.Reader, error) {
return gzip.NewReader(c)
}
default:
return func(c net.Conn) (io.Reader, error) {
return c, nil
}
}
}