From 6b947ff616b31d44b601ad027f92f34faafaad9a Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Fri, 18 Dec 2015 19:22:25 +0100
Subject: telnet client quit command is implemented


diff --git a/src/helsinki.at/rhimportd/ctrlTelnet.go b/src/helsinki.at/rhimportd/ctrlTelnet.go
index bcad22c..1e0a00e 100644
--- a/src/helsinki.at/rhimportd/ctrlTelnet.go
+++ b/src/helsinki.at/rhimportd/ctrlTelnet.go
@@ -25,14 +25,70 @@
 package main
 
 import (
+	"bufio"
+	"fmt"
 	"helsinki.at/rhimport"
 	"net"
+	"strings"
 )
 
-func client_handler(conn net.Conn) {
-	defer conn.Close()
-	rhdl.Println("telnet-ctrl: new client from:", conn.RemoteAddr())
+const (
+	prompt = "rhimportd> "
+)
+
+type TelnetClient struct {
+	conn    net.Conn
+	scanner *bufio.Scanner
+	writer  *bufio.Writer
+}
+
+func (c *TelnetClient) write_string(text string) (err error) {
+	if _, err = c.writer.WriteString(text); err != nil {
+		return
+	}
+	return c.writer.Flush()
+}
+
+func (c *TelnetClient) handle_command(cmd string) bool {
+	if cmd == "quit" {
+		return true
+	} else if strings.HasPrefix(cmd, "help") {
+		c.write_string(fmt.Sprintf("usage: tba...\n"))
+	} else {
+		c.write_string("unknown command\n")
+	}
+	return false
+}
+
+func (c *TelnetClient) handle() {
+	defer c.conn.Close()
+
+	if err := c.write_string(prompt); err != nil {
+		return
+	}
+	for c.scanner.Scan() {
+		if exit := c.handle_command(c.scanner.Text()); exit {
+			return
+		}
+
+		if err := c.write_string(prompt); err != nil {
+			return
+		}
+	}
+	if err := c.scanner.Err(); err != nil {
+		rhdl.Printf("telnet-ctrl(%s): read command error: %s", c.conn.RemoteAddr(), err)
+	} else {
+		rhdl.Printf("telnet-ctrl(%s): connection closed", c.conn.RemoteAddr())
+	}
+}
 
+func newTelnetClient(conn net.Conn) (c *TelnetClient) {
+	rhl.Println("telnet-ctrl: new client from:", conn.RemoteAddr())
+	c = &TelnetClient{}
+	c.conn = conn
+	c.scanner = bufio.NewScanner(conn)
+	c.writer = bufio.NewWriter(conn)
+	return c
 }
 
 func StartControlTelnet(addr_s string, conf *rhimport.Config, rddb *rhimport.RdDb) {
@@ -51,6 +107,7 @@ func StartControlTelnet(addr_s string, conf *rhimport.Config, rddb *rhimport.RdD
 			return
 		}
 
-		go client_handler(conn)
+		c := newTelnetClient(conn)
+		go c.handle()
 	}
 }
-- 
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