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proc.go
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proc.go
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package main
import (
"fmt"
"time"
"net"
"strconv"
"math/rand"
msg "./message"
"./graph"
)
var DEBUG_OUTPUT = false
func ManageConn(Conn *net.UDPConn,
dataCh chan msg.Message,
timeoutCh chan time.Duration,
quitCh chan struct{}) {
var buffer = make([]byte, 4096)
var m msg.Message
//var data string
var timeout time.Duration
timeout = time.Duration(0)
for {
select {
case timeout = <-timeoutCh: {}
case _ = <-quitCh: {return}
default: {
if timeout != 0 {
Conn.SetReadDeadline(time.Now().Add(timeout))
}
n,addr,err := Conn.ReadFromUDP(buffer)
_ = addr
if err != nil {
if e, ok := err.(net.Error); !ok || !e.Timeout() {
// not a timeout
panic(err)
} else {
m = msg.Message{ID_: 0, Type_: "timeout", Sender_: 0, Origin_: 0, Data_: ""}
}
} else {
//data := string(buffer[0:n])
//fmt.Println(data)
m = msg.FromJsonMsg(buffer[0:n])
}
dataCh <- m
}
}
}
}
type Task struct {
Msg msg.Message
Dst *net.UDPAddr
}
func ManageSendQueue(MyConn *net.UDPConn,
taskCh chan Task,
SendInterval time.Duration,
quitCh chan struct{}) {
var t Task
var buffer = make([]byte, 4096)
for {
select {
case _ = <-quitCh: return
case t = <- taskCh: {
time.Sleep(SendInterval)
buffer = t.Msg.ToJsonMsg()
_, err := MyConn.WriteToUDP(buffer, t.Dst)
msg.CheckError(err)
}
}
}
}
func InitGossip(MyID int, NeigAmt int, NeigAddrArr []*net.UDPAddr, taskCh chan Task, ttl int){
for i := 0; i < ttl; i++ {
Dst := rand.Intn(NeigAmt)
SendAddr := NeigAddrArr[Dst]
m := Task{msg.Message{ID_: MyID, Type_: "msg", Sender_: 0, Origin_: 0, Data_: "kek"}, SendAddr}
if DEBUG_OUTPUT {
fmt.Println(MyID, "sending", m, "to", SendAddr)
}
taskCh <- m
}
}
func UpdateTtl(TtlMap map[int]int, BaseTtl int, TtlVal int){
_, ok := TtlMap[TtlVal]
if !ok {
TtlMap[TtlVal] = BaseTtl
}
}
func ProcessMsg(MyID int,
m msg.Message,
NeigAddrArr []*net.UDPAddr,
NeigAmt int,
BaseTtl int,
TtlMap map[int]int,
BaseConfID int,
taskCh chan Task){
UpdateTtl(TtlMap, BaseTtl, m.ID_)
if TtlMap[m.ID_] > 0 {
for ; TtlMap[m.ID_] > 0; {
Dst := rand.Intn(NeigAmt)
//Dst := TtlMap[m.ID_] % NeigAmt
//fmt.Println(Dst)
SendAddr := NeigAddrArr[Dst]
m.Sender_ = MyID
// pass further
if DEBUG_OUTPUT {
fmt.Println(MyID, "sending", m, "to", SendAddr)
}
taskCh <- Task{m, SendAddr}
TtlMap[m.ID_] -= 1
}
// ID of confirmation message
confID := m.ID_+BaseConfID+MyID
UpdateTtl(TtlMap, BaseTtl, confID)
// confirmation msg
m := msg.Message{ID_: confID, Type_: "conf", Sender_: MyID, Origin_: m.Origin_, Data_: strconv.Itoa(MyID)}
for ; TtlMap[confID] > 0; {
Dst := rand.Intn(NeigAmt)
//Dst := TtlMap[confID] % NeigAmt
SendAddr := NeigAddrArr[Dst]
// send conf
if DEBUG_OUTPUT {
fmt.Println(MyID, "sending", m, "to", SendAddr)
}
taskCh <- Task{m, SendAddr}
TtlMap[confID] -= 1
}
} else if DEBUG_OUTPUT {
fmt.Println(MyID, "discarded", m)
}
}
func ProcessConfirmationMsg(m msg.Message,
MyID int,
NeigAddrArr []*net.UDPAddr,
NeigAmt int,
AllGot []bool,
TtlMap map[int]int,
BaseTtl int,
taskCh chan Task) bool{
if m.Origin_ == MyID {
// confurmed message
confID, err := strconv.Atoi(m.Data_)
msg.CheckError(err)
AllGot[confID] = true
if DEBUG_OUTPUT{
fmt.Println(AllGot)
}
all := true
for i := range AllGot {
if AllGot[i] == false {
all = false
break
}
}
if all {
return true
}
} else {
//pass further
UpdateTtl(TtlMap, BaseTtl, m.ID_)
if TtlMap[m.ID_] > 0 {
for ; TtlMap[m.ID_] > 0; {
Dst := rand.Intn(NeigAmt)
//Dst := TtlMap[m.ID_] % NeigAmt
SendAddr := NeigAddrArr[Dst]
m.Sender_ = MyID
// pass further
if DEBUG_OUTPUT {
fmt.Println(MyID, "sending", m, "to", SendAddr)
}
taskCh <- Task{m, SendAddr}
TtlMap[m.ID_] -= 1
}
} else if DEBUG_OUTPUT {
fmt.Println(MyID, "discarded", m)
}
}
return false
}
func proc(MyID int,
gr graph.Graph,
quitCh chan struct{},
killCh chan struct{},
BaseTtl int,
needInit bool) {
Neig, _ := gr.Neighbors(MyID)
NeigAmt := len(Neig)
MyNode, _ := gr.GetNode(MyID)
MyPort := MyNode.Port()
NeigPortArr := make([]int, NeigAmt)
NeigIdArr := make([]int, NeigAmt)
NeigAddrArr := make([]*net.UDPAddr, NeigAmt)
for i := 0; i < NeigAmt; i++ {
NeigPortArr[i] = Neig[i].Port()
var err error
NeigIdArr[i], err = strconv.Atoi(Neig[i].String())
msg.CheckError(err)
NeigAddrArr[i], err = net.ResolveUDPAddr("udp","127.0.0.1:"+strconv.Itoa(NeigPortArr[i]))
msg.CheckError(err)
}
MyAddr,err := net.ResolveUDPAddr("udp","127.0.0.1:"+strconv.Itoa(MyPort))
msg.CheckError(err)
if DEBUG_OUTPUT {
fmt.Println(MyID, MyAddr, NeigAddrArr)
}
MyConn, err := net.ListenUDP("udp", MyAddr)
msg.CheckError(err)
dataCh := make(chan msg.Message)
taskCh := make(chan Task, 4096)
timeoutCh := make(chan time.Duration, 1)
timeoutCh <- time.Duration(0) //time.Millisecond * 50)
AllGot := make([]bool, len(gr))
TtlMap := make(map[int]int)
BaseConfID := 5000
qCh1 := make(chan struct{}, 1)
qCh2 := make(chan struct{}, 1)
go ManageConn(MyConn, dataCh, timeoutCh, qCh1)
go ManageSendQueue(MyConn, taskCh, time.Microsecond * 10, qCh2)
time.Sleep(time.Millisecond*10)
// init gossip
if needInit {
InitGossip(MyID, NeigAmt, NeigAddrArr, taskCh, BaseTtl)
for index, _ := range AllGot {
AllGot[index] = false
}
AllGot[MyID] = true
}
var m msg.Message
ticks := 0
MainLoop:
for ;; ticks++ {
select {
case m = <- dataCh: {
select {
case <-killCh:{}
default: {
if m.Type_ != "timeout" && DEBUG_OUTPUT {
fmt.Println(MyID, "got msg:", m)
}
if m.Type_ == "msg" {
ProcessMsg(MyID, m, NeigAddrArr, NeigAmt, BaseTtl, TtlMap, BaseConfID, taskCh)
} else if m.Type_ == "conf" {
isFinished := ProcessConfirmationMsg(m, MyID, NeigAddrArr, NeigAmt, AllGot, TtlMap, BaseTtl, taskCh)
if (isFinished) {
fmt.Println("Finished in", ticks, "ticks")
break MainLoop
}
} else if m.Type_ == "timeout" {
//break MainLoop
} else {
panic("Unknown message type"+m.Type_)
}
}
}
}
}
}
qCh1 <- struct{}{}
qCh2 <- struct{}{}
//fmt.Println(MyID, "exited")
quitCh <- struct{}{}
}