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graphite_pickle.go
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graphite_pickle.go
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//
// Copyright 2015 Gregory Trubetskoy. All Rights Reserved.
//
// 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 daemon
import (
"bytes"
"encoding/binary"
"fmt"
"log"
"net"
"os"
"strings"
"sync/atomic"
"time"
pickle "github.com/hydrogen18/stalecucumber"
"github.com/tgres/tgres/graceful"
"github.com/tgres/tgres/receiver"
"github.com/tgres/tgres/serde"
)
type graphitePickleServiceManager struct {
rcvr *receiver.Receiver
listener *graceful.Listener
listenSpec string
stop int32
}
func (g *graphitePickleServiceManager) File() *os.File {
if g.listener != nil {
return g.listener.File()
}
return nil
}
func (g *graphitePickleServiceManager) Stop() {
if g.stopped() {
return
}
if g.listener != nil {
log.Printf("Closing listener %s\n", g.listenSpec)
g.listener.Close()
}
atomic.StoreInt32(&(g.stop), 1)
}
func (g *graphitePickleServiceManager) stopped() bool {
return atomic.LoadInt32(&(g.stop)) != 0
}
func (g *graphitePickleServiceManager) Start(file *os.File) error {
var (
gl net.Listener
err error
)
if g.listenSpec != "" {
if file != nil {
gl, err = net.FileListener(file)
} else {
gl, err = net.Listen("tcp", processListenSpec(g.listenSpec))
}
} else {
log.Printf("Not starting Graphite Pickle Protocol because graphite-pickle-listen-spec is blank.")
return nil
}
if err != nil {
return fmt.Errorf("Error starting Graphite Pickle Protocol serviceManager: %v", err)
}
g.listener = graceful.NewListener(gl)
log.Printf("Graphite Pickle protocol Listening on %s\n", processListenSpec(g.listenSpec))
go g.graphitePickleServer()
return nil
}
func (g *graphitePickleServiceManager) graphitePickleServer() error {
var tempDelay time.Duration
for {
conn, err := g.listener.Accept()
// This code comes from the golang http lib, it attempts to
// retry accepting a connection when too many files are open
// under heavy load.
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
log.Printf("Accept error: %v; retrying in %v", err, tempDelay)
time.Sleep(tempDelay)
continue
}
return err
}
tempDelay = 0
go g.handleGraphitePickleProtocol(conn, 30)
}
}
func (g *graphitePickleServiceManager) handleGraphitePickleProtocol(conn net.Conn, timeout int) {
defer conn.Close() // decrements graceful.TcpWg
if timeout != 0 {
conn.SetDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
}
// We use the Scanner, becase it has a MaxScanTokenSize of 64K
var (
name string
tstamp int64
int_value int64
value float64
err error
item interface{}
items, itemSlice, dp []interface{}
)
for {
var (
length uint32
nRead int
)
if g.stopped() {
return
}
if err = binary.Read(conn, binary.BigEndian, &length); err != nil {
break
}
buff := make([]byte, length)
if nRead, err = conn.Read(buff); err != nil {
break
}
if nRead != int(length) {
err = fmt.Errorf("Icomplete read. length: %v nRead: %v", length, nRead)
break
}
if items, err = pickle.ListOrTuple(pickle.Unpickle(bytes.NewBuffer(buff))); err != nil {
break
}
for _, item = range items {
itemSlice, err = pickle.ListOrTuple(item, err)
if len(itemSlice) == 2 {
name, err = pickle.String(itemSlice[0], err)
dp, err = pickle.ListOrTuple(itemSlice[1], err)
if len(dp) == 2 {
tstamp, err = pickle.Int(dp[0], err)
if value, err = pickle.Float(dp[1], err); err != nil {
if _, ok := err.(pickle.WrongTypeError); ok {
if int_value, err = pickle.Int(dp[1], nil); err == nil {
value = float64(int_value)
}
}
}
g.rcvr.QueueDataPoint(serde.Ident{"name": name}, time.Unix(tstamp, 0), value)
} else {
err = fmt.Errorf("dp wrong length: %d", len(dp))
break
}
} else {
err = fmt.Errorf("item wrong length: %d", len(itemSlice))
break
}
}
if err != nil {
break
}
}
if timeout != 0 {
conn.SetDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
}
if err != nil {
if !strings.Contains(err.Error(), "use of closed") {
log.Printf("handleGraphitePickleProtocol(): Error reading: %v", err)
}
}
}