gomud/cmd/echo/telnet.go

package main

import (
	"bufio"
	"context"
	"log"
	"net"

	"github.com/ThreeDotsLabs/watermill"
	"github.com/ThreeDotsLabs/watermill/message"
)

type TELNETParser struct {
	s message.Subscriber
	c context.Context
}

func (tp *TELNETParser) Handle() {
	messages, err := tp.s.Subscribe(tp.c, "telnet.raw")
	if err != nil {
		log.Fatalln("couldn't subscribe to telnet.raw")
	}

	for message := range messages {
		log.Printf("%#+v\n", message)
		message.Ack()
	}

}

func NewTELNETParser(c context.Context, s message.Subscriber) *TELNETParser {
	return &TELNETParser{
		c: c,
		s: s,
	}
}

type TELNETServer struct {
	l net.Listener
	p message.Publisher
	c context.Context
}

func NewTELNETServer(c context.Context, l net.Listener, p message.Publisher) *TELNETServer {
	ts := TELNETServer{
		c: c,
		l: l,
		p: p,
	}

	return &ts
}

func (ts *TELNETServer) Handle(conn net.Conn) {
	s := bufio.NewScanner(conn)
	defer conn.Close()

	for s.Scan() {
		t := s.Text()
		err := ts.p.Publish("telnet.raw", message.NewMessage(watermill.NewUUID(), []byte(t)))
		if err != nil {
			log.Fatalln("couldn't write to telnet.raw")
		}
		log.Printf("Received user input: %q\n", t)
	}
}