134 lines
2.2 KiB
Go
134 lines
2.2 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"log"
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"net"
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"time"
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)
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type client struct {
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_chan chan <- string
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name string
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}
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var (
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entering = make(chan client)
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leaving = make(chan client)
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messages = make(chan string)
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cancel = make(chan time.Time)
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)
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func handleConn(conn net.Conn) {
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defer conn.Close()
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ch := make(chan string)
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go clientWriter(conn,ch)
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who := conn.RemoteAddr().String()
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client := client{
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_chan: ch,
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name: who,
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}
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ch <- "You " + who
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messages <- who + " connected"
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entering <- client
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inputChan := make(chan string)
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timeout := time.NewTimer(40*time.Second)
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defer timeout.Stop()
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input := bufio.NewScanner(conn)
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go func() {
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log.Println("inside of goroutine")
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for input.Scan() {
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log.Println("inside of Scan for loop")
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inputChan <- client.name + ": " + input.Text()
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}
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if err := input.Err(); err != nil {
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log.Printf("Scanner error: %v", err)
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} else {
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log.Println("Scanner reached EOF (connection closed)")
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}
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log.Println("Closing input channel")
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close(inputChan)
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}()
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loop:
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for {
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select {
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case text,ok := <- inputChan:
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if !ok {
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leaving <- client
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messages <- who + " disconnected"
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break loop
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}
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if !timeout.Stop() {
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<- timeout.C
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}
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timeout.Reset(40*time.Second)
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messages <- text
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case <- timeout.C:
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ch <- "Connection timed out due to inactivity"
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leaving <- client
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messages <- who + " disconnected (timeout)"
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break loop
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}
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}
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}
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func clientWriter(conn net.Conn, ch <- chan string) {
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for msg := range ch {
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fmt.Fprintln(conn,msg)
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}
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}
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func broadcaster() {
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clients := make(map[client]bool)
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for {
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select {
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case msg := <- messages:
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log.Println("Got a msg")
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for cli := range clients {
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cli._chan <- msg
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}
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case cli := <- entering:
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cli._chan <- "List of connected clients"
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for i := range clients {
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cli._chan <- i.name
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}
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clients[cli] = true
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case cli := <- leaving:
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log.Printf("Deleting client %s")
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delete(clients,cli)
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close(cli._chan)
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}
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}
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}
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func main() {
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listener,err := net.Listen("tcp",":9090")
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if err != nil {
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log.Fatalf("Error in Lister %v",err)
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}
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go broadcaster()
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for {
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conn,err := listener.Accept()
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if err != nil {
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log.Fatalf("Error in Accept %v",err)
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continue
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}
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go handleConn(conn)
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}
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}
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