From 6c552b607e8c1a175ae26e90b9637836dc571ee9 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Wed, 11 Jan 2017 21:55:56 +0100
Subject: nop-tcp client seems to be working now


diff --git a/src/rhctl/noptcp.go b/src/rhctl/noptcp.go
index 66495ec..6dc8165 100644
--- a/src/rhctl/noptcp.go
+++ b/src/rhctl/noptcp.go
@@ -25,14 +25,66 @@ import (
 	"net"
 )
 
+const (
+	CLIENT_MAX_DATA_BYTES = 64 * 1024 // close connection if the client sends more then 64k of data
+)
+
 type NopTCPInterface struct {
 	ln   net.Listener
 	ctrl *SwitchControl
 }
 
+type Close bool
+
+func readData(con net.Conn, ch chan<- interface{}) {
+	defer func() {
+		ch <- Close(false)
+	}()
+	bytesRead := 0
+	for {
+		var null [1024]byte
+		n, err := con.Read(null[:])
+		if err != nil {
+			return
+		}
+		bytesRead = bytesRead + n
+		if bytesRead > CLIENT_MAX_DATA_BYTES {
+			rhdl.Printf("NopTCP: client(%s) sent too many bytes", con.RemoteAddr())
+			return
+		}
+	}
+}
+
 func handleClient(con net.Conn, ctrl *SwitchControl) {
-	con.Write([]byte("hello world"))
-	con.Close()
+	defer func() {
+		con.Close()
+		rhdl.Printf("NopTCP: client(%s) disconnected", con.RemoteAddr())
+	}()
+
+	var ch = ctrl.Updates.Sub()
+	defer ctrl.Updates.Unsub(ch)
+	go readData(con, ch)
+
+	ctrl.Updates.AddSub(ch, "state")
+	ctrl.Commands <- &Command{Type: CmdState, Response: ch}
+	for {
+		data, ok := <-ch
+		if !ok {
+			return
+		}
+		switch data.(type) {
+		case State:
+			state := data.(State)
+			if state.ActiveServer == "" {
+				state.ActiveServer = "none"
+			}
+			if _, err := con.Write([]byte(state.ActiveServer + "\n")); err != nil {
+				break
+			}
+		case Close:
+			return
+		}
+	}
 }
 
 func (nop *NopTCPInterface) Run() {
@@ -52,6 +104,7 @@ func (nop *NopTCPInterface) Run() {
 				return
 			}
 		}
+		rhdl.Printf("NopTCP: client(%s) connected", con.RemoteAddr())
 		go handleClient(con, nop.ctrl)
 	}
 }
-- 
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