From 849408dda60fe32d7abb78d103b09ca0bc7b5a60 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Thu, 9 Jan 2014 23:15:51 +0100
Subject: [PATCH] Peer handling

---
 peer.go   | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 server.go | 20 ++++++++++--
 2 files changed, 111 insertions(+), 2 deletions(-)
 create mode 100644 peer.go

diff --git a/peer.go b/peer.go
new file mode 100644
index 000000000..0c8d38772
--- /dev/null
+++ b/peer.go
@@ -0,0 +1,93 @@
+package main
+
+import (
+  "net"
+  "errors"
+  "log"
+)
+
+type InMsg struct {
+  msgType   string  // Specifies how the encoded data should be interpreted
+  data      []byte  // RLP encoded data
+}
+
+func ReadMessage(conn net.Conn) (*InMsg, error) {
+  buff := make([]byte, 4069)
+
+  // Wait for a message from this peer
+  n, err := conn.Read(buff)
+  if err != nil {
+    return nil, err
+  } else if n == 0 {
+    return nil, errors.New("Empty message received")
+  }
+
+  // Read the header (MAX n)
+  decoder := NewRlpDecoder(buff[:n])
+  t := decoder.Get(0).AsString()
+  if t == "" {
+    return nil, errors.New("Data contained no data type")
+  }
+
+  return &InMsg{msgType: t, data: decoder.Get(1).AsBytes()}, nil
+}
+
+type OutMsg struct {
+  data      []byte
+}
+
+type Peer struct {
+  server      *Server
+  conn        net.Conn
+  outputQueue chan OutMsg
+  quit        chan bool
+}
+
+func NewPeer(conn net.Conn, server *Server) *Peer {
+  return &Peer{
+    outputQueue:       make(chan OutMsg, 1),  // Buffered chan of 1 is enough
+    quit:              make(chan bool),
+
+    server:            server,
+    conn:              conn,
+  }
+}
+
+// Outputs any RLP encoded data to the peer
+func (p *Peer) QueueMessage(data []byte) {
+  p.outputQueue <- OutMsg{data: data}
+}
+
+func (p *Peer) HandleOutbound() {
+out:
+  for {
+    switch {
+    case <- p.quit:
+      break out
+    }
+  }
+}
+
+func (p *Peer) HandleInbound() {
+  defer p.conn.Close()
+
+out:
+  for {
+    msg, err := ReadMessage(p.conn)
+    if err != nil {
+      log.Println(err)
+
+      break out
+    }
+
+    log.Println(msg)
+  }
+
+  // Notify the out handler we're quiting
+  p.quit <- true
+}
+
+func (p *Peer) Start() {
+  go p.HandleOutbound()
+  go p.HandleInbound()
+}
diff --git a/server.go b/server.go
index d7718a8a6..feaf61076 100644
--- a/server.go
+++ b/server.go
@@ -2,7 +2,8 @@ package main
 
 import (
   "container/list"
-  "time"
+  "net"
+  "log"
 )
 
 var Db *LDBDatabase
@@ -36,12 +37,27 @@ func NewServer() (*Server, error) {
   return server, nil
 }
 
+func (s *Server) AddPeer(conn net.Conn) {
+  s.peers.PushBack(NewPeer(conn, s))
+}
+
 // Start the server
 func (s *Server) Start() {
   // For now this function just blocks the main thread
+  ln, err := net.Listen("tcp", ":12345")
+  if err != nil {
+    log.Fatal(err)
+  }
+
   go func() {
     for {
-      time.Sleep( time.Second )
+      conn, err := ln.Accept()
+      if err != nil {
+        log.Println(err)
+        continue
+      }
+
+      go s.AddPeer(conn)
     }
   }()
 }