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server.go
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server.go
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package main
import (
"fmt"
"io"
"net"
)
// ConnHandler is a type representing TCP connection handlers
type ConnHandler func(net.Conn)
// Pipe is an abstraction for a pipe with reader and writer
type Pipe struct {
REnd *io.PipeReader
WEnd *io.PipeWriter
}
// NewPipe creates a new Pipe instance
func NewPipe() *Pipe {
r, w := io.Pipe()
return &Pipe{REnd: r, WEnd: w}
}
func connect(inPipe, outPipe *Pipe, conn net.Conn) chan bool {
finish := make(chan bool, 1)
go func() {
io.Copy(conn, inPipe.REnd)
finish <- true
}()
go func() {
io.Copy(outPipe.WEnd, conn)
finish <- true
}()
return finish
}
func startListener(addr string, h ConnHandler) chan bool {
ready := make(chan bool, 1)
go func() {
ln, err := net.Listen("tcp", addr)
if err != nil {
fmt.Println("ERROR:", err)
ready <- true
return
}
ready <- true
for {
conn, err := ln.Accept()
if err != nil {
fmt.Println("ERROR:", err)
}
go h(conn)
}
}()
return ready
}
func serve(host string, sharePort int, joinPort int) {
// sharePipe := NewPipe()
// joinPipe := NewPipe()
shareAddr := fmt.Sprintf("%s:%d", host, sharePort)
joinAddr := fmt.Sprintf("%s:%d", host, joinPort)
<-startListener(shareAddr, func(conn net.Conn) {
token, err := readToken(conn)
if err != nil {
return
}
session := NewSession(conn)
saveSession(token, session)
<-connect(session.JoinPipe, session.SharePipe, conn)
})
<-startListener(joinAddr, func(conn net.Conn) {
token, err := readToken(conn)
if err != nil {
return
}
session, err := lookup(token)
if err != nil {
conn.Close()
return
}
<-connect(session.SharePipe, session.JoinPipe, conn)
})
}