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ResourceServer.go
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ResourceServer.go
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package main
import (
"bufio"
"encoding/binary"
"errors"
"fmt"
"log"
"math/rand"
"net"
"net/http"
"net/rpc"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"sync"
"time"
)
const (
MsgTypeStart = 4
MsgTypeStop = 5
RPCPORT = "9999"
NumerOfCars = 4
DirNotOnBridge = 0
DirLeftToRight = 1
DirRightToLeft = 2
OuterLane = 0
InnerLane = 1
EMPTYLANE = " "
)
//Car view structure to display car information in console
type carView struct {
posX, posY int
name string
lane int
lanePos int
}
//Point to store coordinates of lanes
type P struct {
x, y int
}
var myCars [5]carView
var track [15]string
var lanes [2][]P
//Message interface to communicate with Cars
type Message struct { //11 bytes total = MessageLEN
CarId uint8 //Car number
MsgType uint8 //MsgTypeRequest, MsgTypeReply, MsgTypeRelease
Timestamp uint64 //logical time
Dir uint8 //Direction to go
}
var localMutex sync.Mutex
func (m *Message) toString() string {
return strconv.FormatUint(uint64(m.CarId), 10) + ":" + strconv.FormatUint(uint64(m.MsgType), 10) + ":" + strconv.FormatUint(uint64(m.Timestamp), 10)
}
func (m *Message) toBytes() []byte {
byteArr := []byte{m.CarId, m.MsgType}
tsBytes := make([]byte, 8)
binary.BigEndian.PutUint64(tsBytes, m.Timestamp)
byteArr = append(byteArr, tsBytes...)
byteArr = append(byteArr, m.Dir)
return byteArr
}
//RPC Server interface
type Server struct {
rpcPort string
carPorts []string
logFileP *os.File
isServing bool
}
//Method to move the car throughout the lane, called via RPC Clients (Cars)
//text = carID:stepsToMove:shouldChangeCity
//currState = isDecisionPos:dirToMove
func (s *Server) MoveCar(text string, currState *string) error { //String format carId:text
//log.Println(msg.toString())
moveErr := errors.New("Move Failed!!")
parts := strings.Split(text, ":")
if len(parts) < 3 {
return moveErr
}
carID, err := strconv.Atoi(parts[0])
if err != nil {
return moveErr
}
//stepsToMove, err := strconv.Atoi(parts[1])
_, err = strconv.Atoi(parts[1])
if err != nil {
return moveErr
}
shouldChangeCity, err := strconv.Atoi(parts[2])
if err != nil {
return moveErr
}
//writeLog(fmt.Sprintf("text = %s\n", text), s.logFileP)
isDecisionPos, dirToMove := moveCar(&myCars[carID], shouldChangeCity != 0)
dB := '0'
if isDecisionPos == 1 {
dB = '1'
}
dirB := '0'
if dirToMove == DirLeftToRight {
dirB = '1'
} else if dirToMove == DirRightToLeft {
dirB = '2'
}
ss := string([]byte{byte(dB), byte(':'), byte(dirB)})
//writeLog(fmt.Sprintf("reply ss = %s\n", ss), s.logFileP)
*currState = ss
//}
return nil
}
//Method to clear the console screen to draw the current track
func clearScreen() {
if runtime.GOOS == "linux" {
cmd := exec.Command("clear")
cmd.Stdout = os.Stdout
cmd.Run()
} else if runtime.GOOS == "windows" {
cmd := exec.Command("cmd", "/c", "cls")
cmd.Stdout = os.Stdout
cmd.Run()
} else {
fmt.Println("Clear method undefined!!")
}
}
//Method to Draw the track
func drawTrack() {
track[0] = "---------------------------- ----------------------------"
track[1] = "| | | |"
track[2] = "| | | |"
track[3] = "| |------------| | | |------------| |"
track[4] = "| |------------| | | |------------| |"
track[5] = "| |------------| | | |------------| |"
track[6] = "| |------------| ============================= |------------| |"
track[7] = "| |------------| |------------| |"
track[8] = "| |------------| ============================= |------------| |"
track[9] = "| |------------| | | |------------| |"
track[10] = "| |------------| | | |------------| |"
track[11] = "| |------------| | | |------------| |"
track[12] = "| | | |"
track[13] = "| | | |"
track[14] = "---------------------------- ----------------------------"
}
//Method to get random int between range
func random(min, max int) int {
return rand.Intn(max-min) + min
}
//Method to initialize the lane paths and Cars
func initCarsAndLanes() {
drawTrack()
lanes[OuterLane] = []P{P{24, 6}, P{24, 5}, P{24, 4}, P{24, 3}, P{24, 2}, P{24, 1}, //Count #6
P{22, 1}, P{20, 1}, P{18, 1}, P{16, 1}, P{14, 1}, P{12, 1}, P{10, 1}, P{8, 1}, P{6, 1}, P{4, 1}, P{2, 1}, //Count #17
P{2, 2}, P{2, 3}, P{2, 4}, P{2, 5}, P{2, 6}, P{2, 7}, P{2, 8}, P{2, 9}, P{2, 10}, P{2, 11}, P{2, 12}, P{2, 13}, //Count #29
P{4, 13}, P{6, 13}, P{8, 13}, P{10, 13}, P{12, 13}, P{14, 13}, P{16, 13}, P{18, 13}, P{20, 13}, P{22, 13}, P{24, 13}, //Count #40
P{24, 12}, P{24, 11}, P{24, 10}, P{24, 9}, P{24, 8}, /*End of Left*/ //Count #45
P{26, 7}, P{28, 7}, P{30, 7}, P{32, 7}, P{34, 7}, P{36, 7}, P{38, 7}, P{40, 7}, P{42, 7}, P{44, 7}, P{46, 7}, P{48, 7}, P{50, 7}, P{52, 7}, P{54, 7}, /*End of bridge*/ //Count #60
P{57, 8}, P{57, 9}, P{57, 10}, P{57, 11}, P{57, 12}, P{57, 13}, //Count #66
P{59, 13}, P{61, 13}, P{63, 13}, P{65, 13}, P{67, 13}, P{69, 13}, P{71, 13}, P{73, 13}, P{75, 13}, P{77, 13}, P{79, 13}, //Count #77
P{79, 12}, P{79, 11}, P{79, 10}, P{79, 9}, P{79, 8}, P{79, 7}, P{79, 6}, P{79, 5}, P{79, 4}, P{79, 3}, P{79, 2}, P{79, 1}, //Count #89
P{77, 1}, P{75, 1}, P{73, 1}, P{71, 1}, P{69, 1}, P{67, 1}, P{65, 1}, P{63, 1}, P{61, 1}, P{59, 1}, P{57, 1}, //Count #100
P{57, 2}, P{57, 3}, P{57, 4}, P{57, 5}, P{57, 6}, /*End of Right*/ //Count #105
P{54, 7}, P{52, 7}, P{50, 7}, P{48, 7}, P{46, 7}, P{44, 7}, P{42, 7}, P{40, 7}, P{38, 7}, P{36, 7}, P{34, 7}, P{32, 7}, P{30, 7}, P{28, 7}, P{26, 7} /*End of bridge*/} //Count #120
lanes[InnerLane] = []P{P{22, 7}, P{22, 6}, P{22, 5}, P{22, 4}, P{22, 3}, P{22, 2}, //Count #6
P{20, 2}, P{18, 2}, P{16, 2}, P{14, 2}, P{12, 2}, P{10, 2}, P{8, 2}, P{6, 2}, P{4, 2}, //Count #15
P{4, 3}, P{4, 4}, P{4, 5}, P{4, 6}, P{4, 7}, P{4, 8}, P{4, 9}, P{4, 10}, P{4, 11}, P{4, 12}, //Count #25
P{6, 12}, P{8, 12}, P{10, 12}, P{12, 12}, P{14, 12}, P{16, 12}, P{18, 12}, P{20, 12}, P{22, 12}, //Count #34
P{22, 11}, P{22, 10}, P{22, 9}, P{22, 8}, /*End of Left*/ //Count #38
P{22, 7}, P{24, 7}, P{26, 7}, P{28, 7}, P{30, 7}, P{32, 7}, P{34, 7}, P{36, 7}, P{38, 7}, P{40, 7}, P{42, 7}, P{44, 7}, P{46, 7}, P{48, 7}, P{50, 7}, P{52, 7}, P{54, 7}, P{56, 7}, P{58, 7}, /*End of bridge*/ //Count #57
P{59, 7}, P{59, 8}, P{59, 9}, P{59, 10}, P{59, 11}, P{59, 12}, //Count #63
P{61, 12}, P{63, 12}, P{65, 12}, P{67, 12}, P{69, 12}, P{71, 12}, P{73, 12}, P{75, 12}, P{77, 12}, //Count #72
P{77, 11}, P{77, 10}, P{77, 9}, P{77, 8}, P{77, 7}, P{77, 6}, P{77, 5}, P{77, 4}, P{77, 3}, P{77, 2}, //Count #82
P{75, 2}, P{73, 2}, P{71, 2}, P{69, 2}, P{67, 2}, P{65, 2}, P{63, 2}, P{61, 2}, P{59, 2}, //Count #91
P{59, 3}, P{59, 4}, P{59, 5}, P{59, 6}, /*End of Right*/ //Count #95
P{59, 7}, P{56, 7}, P{54, 7}, P{52, 7}, P{50, 7}, P{48, 7}, P{46, 7}, P{44, 7}, P{42, 7}, P{40, 7}, P{38, 7}, P{36, 7}, P{34, 7}, P{32, 7}, P{30, 7}, P{28, 7}, P{26, 7}, P{24, 7} /*End of bridge*/} //Count #113
myCars[1].name = "R1"
myCars[1].lane = OuterLane
myCars[1].lanePos = 0
myCars[1].posX = lanes[myCars[1].lane][myCars[1].lanePos].x
myCars[1].posY = lanes[myCars[1].lane][myCars[1].lanePos].y
myCars[2].name = "R2"
myCars[2].lane = InnerLane
myCars[2].lanePos = 0
myCars[2].posX = lanes[myCars[2].lane][myCars[2].lanePos].x
myCars[2].posY = lanes[myCars[2].lane][myCars[2].lanePos].y
myCars[3].name = "B1"
myCars[3].lane = OuterLane
myCars[3].lanePos = 60
myCars[3].posX = lanes[myCars[3].lane][myCars[3].lanePos].x
myCars[3].posY = lanes[myCars[3].lane][myCars[3].lanePos].y
myCars[4].name = "B2"
myCars[4].lane = InnerLane
myCars[4].lanePos = 57
myCars[4].posX = lanes[myCars[4].lane][myCars[4].lanePos].x
myCars[4].posY = lanes[myCars[4].lane][myCars[4].lanePos].y
}
//Method to move the car internally
func moveCar(myCar *carView, shouldChangeCity bool) (int, int) {
localMutex.Lock()
dirToMove := DirNotOnBridge
carLane := myCar.lane
switch carLane {
case OuterLane:
if myCar.lanePos >= 45 && myCar.lanePos < 60 {
dirToMove = DirLeftToRight
} else if myCar.lanePos >= 105 && myCar.lanePos < 120 {
dirToMove = DirRightToLeft
} else {
dirToMove = DirNotOnBridge
}
if myCar.posX == 24 && myCar.posY == 8 && !shouldChangeCity {
myCar.lanePos = -1
dirToMove = DirLeftToRight
} else if myCar.posX == 57 && myCar.posY == 6 && !shouldChangeCity {
myCar.lanePos = 59
dirToMove = DirRightToLeft
}
break
case InnerLane:
if myCar.lanePos >= 38 && myCar.lanePos < 57 {
dirToMove = DirLeftToRight
} else if myCar.lanePos >= 95 && myCar.lanePos < 113 {
dirToMove = DirRightToLeft
} else {
dirToMove = DirNotOnBridge
}
if myCar.posX == 22 && myCar.posY == 8 && !shouldChangeCity {
myCar.lanePos = -1
dirToMove = DirLeftToRight
} else if myCar.posX == 59 && myCar.posY == 6 && !shouldChangeCity {
myCar.lanePos = 56
dirToMove = DirRightToLeft
}
break
default:
fmt.Println("Invalid Lane Info!!")
break
}
if myCar.lanePos+1 >= len(lanes[carLane]) {
myCar.lanePos = 0
} else {
myCar.lanePos++
}
carChars := []byte(EMPTYLANE)
trackChars := []byte(track[myCar.posY])
for k := 0; k < len(carChars); k++ {
trackChars[myCar.posX+k] = carChars[k]
}
track[myCar.posY] = string(trackChars)
myCar.posX = lanes[carLane][myCar.lanePos].x
myCar.posY = lanes[carLane][myCar.lanePos].y
carChars = []byte(myCar.name)
trackChars = []byte(track[myCar.posY])
for k := 0; k < len(carChars); k++ {
trackChars[myCar.posX+k] = carChars[k]
}
track[myCar.posY] = string(trackChars)
isDecisionPos := 0
if ((myCar.posX == 24 && myCar.posY == 8) || (myCar.posX == 57 && myCar.posY == 6)) || ((myCar.posX == 22 && myCar.posY == 8) || (myCar.posX == 59 && myCar.posY == 6)) {
isDecisionPos = 1
}
if isDecisionPos == 1 {
if myCar.lane == OuterLane {
if myCar.posX == 24 && myCar.posY == 8 {
dirToMove = DirLeftToRight
} else if myCar.posX == 57 && myCar.posY == 6 {
dirToMove = DirRightToLeft
}
} else {
if myCar.posX == 22 && myCar.posY == 8 {
dirToMove = DirLeftToRight
} else if myCar.posX == 59 && myCar.posY == 6 {
dirToMove = DirRightToLeft
}
}
}
localMutex.Unlock()
return isDecisionPos, dirToMove
}
//To get interface IP automatically, while connected to internet
func getInterfaceIPv4() string {
conn, err := net.Dial("udp", "8.8.8.8:80")
if err != nil {
log.Println(err)
return ""
}
localAddr := conn.LocalAddr().(*net.UDPAddr)
ip := localAddr.IP.To4()
if ip == nil {
conn.Close()
log.Println("Not connected to a IPv4 network!!")
return ""
}
conn.Close()
return ip.String()
}
//Mthod to start the RPC Server
func startServer(a *Server) {
rpc.Register(a)
rpc.HandleHTTP()
ip := getInterfaceIPv4()
if ip == "" {
ip = "localhost"
fmt.Println("Using localhost instead")
}
l, e := net.Listen("tcp", ip+":"+a.rpcPort)
if e != nil {
log.Fatal("listen error:", e)
}
fmt.Printf("Server started at port %s:%s\n", ip, a.rpcPort)
e = http.Serve(l, nil)
if e != nil {
log.Fatal("Error serving %q", e)
}
}
//Method to send messages to all the Cars, to start and stop the processes
func sendMessageToCars(portList []string, msg Message) {
//log.Println(msg.toString())
for i := 1; i < len(portList); i++ {
ua, err := net.ResolveUDPAddr("udp4", "255.255.255.255:"+portList[i])
uc, err := net.DialUDP("udp4", nil, ua)
if err != nil {
fmt.Printf("Failed to connect to server %s\n", portList[i])
fmt.Println(err)
return
}
//defer uc.Close()
data := msg.toBytes()
//log.Printf(">> udp: %s\n", portList[i])
//log.Println(data)
_, err = uc.Write(data)
if err != nil {
fmt.Printf("Failed to send reply to %s\n", portList[i])
fmt.Println(err)
return
}
defer uc.Close()
//uc.SetDeadline(time.Now().Add(3 * time.Second))
}
//log.Println("SENT")
}
//nodeID == 0 for RPC Server
func readNetworkConfig(txtFileName string, nodeID string) ([]string, string, error) { //Returns []carPorts and selfPort
carportList := make([]string, NumerOfCars+1)
var selfPort string
nodeNum, err := strconv.Atoi(nodeID)
if err != nil {
fmt.Println("Invalid config")
return carportList, selfPort, err
}
file, err := os.Open(txtFileName)
if err != nil {
log.Println(err)
return carportList, selfPort, err
}
defer file.Close()
i := 1
scanner := bufio.NewScanner(file)
for i <= NumerOfCars && scanner.Scan() {
line := strings.Trim(scanner.Text(), " ")
if line != "" {
carportList[i] = line
}
i++
}
if nodeNum > 0 {
selfPort = carportList[nodeNum]
}
if err := scanner.Err(); err != nil {
log.Println(err)
return carportList, selfPort, err
}
fmt.Printf("%v\n", carportList)
return carportList, selfPort, err
}
//Method to write log in log file
func writeLog(data string, file *os.File) int {
//fmt.Print(data)
if file == nil {
return -1
}
n, err := file.WriteString(data)
if isError(err) {
return -1
}
file.Sync()
return n
}
//Method to update the console display, every 200ms
func rasterDisplay() {
initCarsAndLanes()
for {
time.Sleep(200 * time.Duration(time.Millisecond))
localMutex.Lock()
clearScreen()
for i := 0; i < len(track); i++ {
fmt.Println(track[i])
}
localMutex.Unlock()
}
}
func main() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
s := new(Server)
s.rpcPort = RPCPORT
filePath := "LogFile.txt"
s.isServing = false
var err error
var timeout int
args := os.Args
if len(args) != 3 {
fn := strings.Split(args[0], "\\")
fmt.Printf("Usage:\n\t%q [rpcPort] [timeoutInSec]\n", fn[len(fn)-1])
return
} else {
port, err := strconv.Atoi(args[1])
if err == nil && port > 1000 && port < 65536 {
s.rpcPort = args[1]
} else {
fmt.Println("Invalid port!!")
return
}
timeout, err = strconv.Atoi(args[2])
if err != nil {
fmt.Println("Invalid timeout!!")
return
}
}
s.carPorts, _, err = readNetworkConfig("config.txt", "0")
if err != nil {
fmt.Println("Failed to read config!!")
return
}
os.Create(filePath)
s.logFileP, err = os.OpenFile(filePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, os.ModeAppend)
if err != nil {
log.Println(err)
s.logFileP = nil
return
}
//fmt.Println("Getting Car Info.....!!")
go func() {
time.Sleep(time.Duration(time.Second))
sendMessageToCars(s.carPorts, Message{0, MsgTypeStart, 0, 0})
}()
//fmt.Println("Wait %d sec .....!!", timeout)
go func() {
time.Sleep(time.Duration(time.Duration(timeout) * time.Second))
sendMessageToCars(s.carPorts, Message{0, MsgTypeStop, 0, 0})
time.Sleep(time.Duration(2 * time.Second))
//rasterDisplay()
if s.logFileP != nil {
s.logFileP.Close()
}
os.Exit(0)
}()
go startServer(s)
rasterDisplay()
}
func isError(err error) bool {
if err != nil {
log.Println(err.Error())
}
return (err != nil)
}