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Added dynamic load balancing feature #1

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Added dynamic load balancing feature #1

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1 change: 1 addition & 0 deletions .gitignore
View file
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Original file line number Diff line number Diff line change
@@ -1,2 +1,3 @@
tcpsplice
monitor.go
tcpsplice.conf
13 changes: 9 additions & 4 deletions monitor.html
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,7 @@
{
background-color: #f0f0f0;
}
.session:nth-child(odd)
.session:nth-child(odd)
{
background-color: #f8f8f8;
}
Expand Down Expand Up @@ -115,6 +115,10 @@
{
width: 230px;
}
.xxlarge
{
width: 300px;
}
.large
{
width: 170px;
Expand Down Expand Up @@ -190,7 +194,7 @@
if (ids.length > 0)
{
services += '<div class="session"><span class="large">source address</span><span class="large">target address</span>' +
'<span class="medium">duration</span><span class="xlarge">uplink &#9650;</span>' +
'<span class="xxlarge">target name</span><span class="small">duration</span><span class="xlarge">uplink &#9650;</span>' +
'<span class="xlarge">downlink &#9660;</span><span class="large">metadata</span><span class="small">abort</span></div>';
}
else
Expand All @@ -201,14 +205,15 @@
{
info = sessions[session[0]];
services += sprintf('<div class="session%s">' +
'<span class="large">%s</span><span class="large">%s</span><span class="medium">%s</span>' +
'<span class="large">%s</span><span class="large">%s</span><span class="xxlarge">%s</span>' +
'<span class="small">%s</span>' +
'<span class="xlarge">%s - %.1fMbps - %.1fMbps</span>' +
'<span class="xlarge">%s - %.1fMbps - %.1fMbps</span>' +
'<span class="large">%s</span>' +
'<span class="small"><a href="#" onclick="return terminate(\'%s\');">&#10060;</a></span>' +
'</div>',
info.done ? " done" : "",
info.source, info.target, age(info.duration),
info.source, info.target, info.targetName, age(info.duration),
size(info.bytes[0]), info.mean[0], info.last[0],
size(info.bytes[1]), info.mean[1], info.last[1],
info.meta, session[0]);
Expand Down
129 changes: 102 additions & 27 deletions tcpsplice.go
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Original file line number Diff line number Diff line change
@@ -1,28 +1,31 @@
package main

import (
"bytes"
"crypto/md5"
"encoding/json"
"fmt"
"github.com/pyke369/golang-support/uconfig"
"github.com/pyke369/golang-support/ulog"
"io/ioutil"
"math"
"math/rand"
"net"
"net/http"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"sync"
"time"
)

const progname = "tcpsplice"
const version = "1.0.2"
const version = "1.0.3"

type Session struct {
id, service, source, target, meta string
id, service, source, target, meta, targetName string
started, active, last time.Time
sourceRead, targetWritten, targetRead, sourceWritten int64
sourceMeanThroughput, targetMeanThroughput float64
Expand All @@ -31,22 +34,61 @@ type Session struct {
abort chan bool
}

type Backend struct {
Fqdn string
Port int
}

var (
config *uconfig.UConfig
logger *ulog.ULog
start time.Time
statistics chan *Session
sessions map[string]*Session
sessionsLock sync.RWMutex
backendsURL bytes.Buffer
)

func serviceHandler(service string, listener *net.TCPListener) {
//Init service
remotes := make([]string, 0)
listenPort := listener.Addr().(*net.TCPAddr).Port
backendUrl := config.GetString(fmt.Sprintf("services.%s.backend_url", service), "")
static := true
if strings.EqualFold(config.GetString(fmt.Sprintf("services.%s.remote_type", service), "static"), "dynamic") {
logger.Info("%s Service : Dynamic backends are defined", service)
//Initializing backends
remotes = backendHandler(backendUrl, service, listenPort)
if len(remotes) == 0 {
logger.Warn("%s Service : Error while initializing Dynamic Backend, switching in static mode", service)
} else {
// Consider dynamic configuration is working so disabling static mode
static = false
backendTicker := time.NewTicker(time.Millisecond * 1000)
go func() {
for {
select {
case <-backendTicker.C:
tmpRemotes := make([]string, 0)
tmpRemotes = backendHandler(backendUrl, service, listenPort)
if len(tmpRemotes) > 0 {
remotes = tmpRemotes
}
}
}
}()
}
}
if static {
logger.Info("%s Service : Static backends will be used", service)
remotes = config.GetPaths(fmt.Sprintf("services.%s.remote", service))
}
for {
if source, err := listener.AcceptTCP(); err == nil {
remotes := config.GetPaths(fmt.Sprintf("services.%s.remote", service))
logger.Info("%s Service : Start Listening on port %v", service, listenPort)
if len(remotes) > 0 {
go func() {
remote := config.GetString(remotes[rand.Int31n(int32(len(remotes)))], "")
remote := remotes[rand.Int31n(int32(len(remotes)))]
if target, err := net.DialTimeout("tcp", remote,
time.Second*time.Duration(config.GetDurationBounds(fmt.Sprintf("services.%s.connect_timeout", service), 10, 2, 60))); err == nil {
incomingSize := config.GetSizeBounds(fmt.Sprintf("services.%s.incoming_buffer_size", service), 64*1024, 4*1024, 512*1024)
Expand All @@ -62,19 +104,20 @@ func serviceHandler(service string, listener *net.TCPListener) {
target.(*net.TCPConn).SetReadBuffer(int(outgoingSize))
target.(*net.TCPConn).SetWriteBuffer(int(outgoingSize))
session := &Session{
id: fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("%s%s", source.RemoteAddr(), target.RemoteAddr())))),
service: service,
source: fmt.Sprintf("%s", source.RemoteAddr()),
target: fmt.Sprintf("%s", target.RemoteAddr()),
started: time.Now(),
active: time.Now(),
last: time.Time{},
meta: "-",
abort: make(chan bool, 1),
id: fmt.Sprintf("%x", md5.Sum([]byte(fmt.Sprintf("%s%s", source.RemoteAddr(), target.RemoteAddr())))),
service: service,
source: fmt.Sprintf("%s", source.RemoteAddr()),
target: fmt.Sprintf("%s", target.RemoteAddr()),
targetName: strings.Split(remote, ":")[0],
started: time.Now(),
active: time.Now(),
last: time.Time{},
meta: "-",
abort: make(chan bool, 1),
}
if logMinimumSize == 0 {
session.loggued = true
logger.Info(map[string]interface{}{"type": "splice", "id": session.id, "service": service, "source": session.source, "target": session.target})
logger.Info(map[string]interface{}{"type": "splice", "id": session.id, "service": service, "source": session.source, "target": session.target, "targetName": session.targetName})
}
if sessionMinimumSize == 0 {
statistics <- session
Expand Down Expand Up @@ -106,7 +149,7 @@ func serviceHandler(service string, listener *net.TCPListener) {
session.targetWritten += int64(written)
}
if err != nil {
logger.Warn(map[string]interface{}{"type": "error", "id": session.id, "service": service, "source": session.source, "target": session.target, "error": "target write timeout"})
logger.Warn(map[string]interface{}{"type": "error", "id": session.id, "service": service, "source": session.source, "target": session.target, "targetName": session.targetName, "error": "target write timeout"})
break
}
}
Expand Down Expand Up @@ -156,7 +199,7 @@ func serviceHandler(service string, listener *net.TCPListener) {
}
if !session.loggued && (session.targetWritten >= logMinimumSize || session.sourceWritten >= logMinimumSize) {
session.loggued = true
logger.Info(map[string]interface{}{"type": "splice", "id": session.id, "service": service, "source": session.source, "target": session.target})
logger.Info(map[string]interface{}{"type": "splice", "id": session.id, "service": service, "source": session.source, "target": session.target, "targetName": session.targetName})
}
if (session.targetWritten >= sessionMinimumSize || session.sourceWritten >= sessionMinimumSize) && time.Now().Sub(session.last) >= time.Second*2 {
session.last = time.Now()
Expand Down Expand Up @@ -212,15 +255,16 @@ func monitorHandler(response http.ResponseWriter, request *http.Request) {
sessionsLock.RLock()
for id, session := range sessions {
s[id] = map[string]interface{}{
"started": session.started.Unix(),
"duration": time.Now().Sub(session.started) / time.Second,
"source": session.source,
"target": session.target,
"bytes": [2]int64{session.sourceRead, session.targetRead},
"mean": [2]float64{session.sourceMeanThroughput, session.targetMeanThroughput},
"last": [2]float64{session.sourceLastThroughput, session.targetLastThroughput},
"meta": session.meta,
"done": session.done,
"started": session.started.Unix(),
"duration": time.Now().Sub(session.started) / time.Second,
"source": session.source,
"target": session.target,
"targetName": session.targetName,
"bytes": [2]int64{session.sourceRead, session.targetRead},
"mean": [2]float64{session.sourceMeanThroughput, session.targetMeanThroughput},
"last": [2]float64{session.sourceLastThroughput, session.targetLastThroughput},
"meta": session.meta,
"done": session.done,
}
}
sessionsLock.RUnlock()
Expand All @@ -244,7 +288,8 @@ func monitorHandler(response http.ResponseWriter, request *http.Request) {
sessionsLock.RUnlock()
} else {
response.Header().Set("Content-Type", "text/html; charset=utf-8")
response.Write(monitorContent)
monitorFile, _ := ioutil.ReadFile("monitor.html")
response.Write(monitorFile)
}
}

Expand Down Expand Up @@ -296,6 +341,36 @@ func baseHandler(next http.Handler) http.Handler {
})
}

func backendHandler(backendUrl string, service string, port int) []string {
backends := make([]Backend, 0)
backendArray := make([]string, 0)
//Makes HTTP request
resp, err := http.Get(backendUrl)
defer resp.Body.Close()
if err != nil {
logger.Warn("%s Service : %s", service, err)
return backendArray
}
// Parses JSON response into
err = json.NewDecoder(resp.Body).Decode(&backends)
if err != nil {
logger.Warn("%s Service : %s", service, err)
return backendArray
}
// Converts Backend Array to String Array Containing URLs
for _, backend := range backends {
if backend.Port == 0 {
backend.Port = port
}
var backendRTMPUrl bytes.Buffer
backendRTMPUrl.WriteString(backend.Fqdn)
backendRTMPUrl.WriteString(":")
backendRTMPUrl.WriteString(strconv.Itoa(backend.Port))
backendArray = append(backendArray, backendRTMPUrl.String())
}
return backendArray
}

func main() {
var err error

Expand Down Expand Up @@ -349,7 +424,7 @@ func main() {
case session := <-statistics:
sessionsLock.Lock()
if sessions[session.id] == nil {
sessions[session.id] = &Session{service: session.service, source: session.source, target: session.target, started: session.started, abort: session.abort}
sessions[session.id] = &Session{service: session.service, source: session.source, target: session.target, targetName: session.targetName, started: session.started, abort: session.abort}
}
sessionsLock.Unlock()
duration := math.Max(float64(time.Now().Sub(session.started))/float64(time.Second), 0.001)
Expand Down