132 lines
3.0 KiB
Go
132 lines
3.0 KiB
Go
package main
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import (
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"net"
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"errors"
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"log"
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)
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type InMsg struct {
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msgType string // Specifies how the encoded data should be interpreted
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data []byte // RLP encoded data
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}
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type OutMsg struct {
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msgType string
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data []byte
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}
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func ReadMessage(conn net.Conn) (*InMsg, error) {
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buff := make([]byte, 4069)
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// Wait for a message from this peer
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n, err := conn.Read(buff)
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if err != nil {
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return nil, err
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} else if n == 0 {
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return nil, errors.New("Empty message received")
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}
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// Read the header (MAX n)
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// XXX The data specification is made up. This will change once more details have been released on the specification of the format
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decoder := NewRlpDecoder(buff[:n])
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t := decoder.Get(0).AsString()
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// If the msgdata contains no data we throw an error and disconnect the peer
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if t == "" {
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return nil, errors.New("Data contained no data type")
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}
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return &InMsg{msgType: t, data: decoder.Get(1).AsBytes()}, nil
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}
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type Peer struct {
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// Server interface
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server *Server
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// Net connection
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conn net.Conn
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// Output queue which is used to communicate and handle messages
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outputQueue chan OutMsg
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// Quit channel
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quit chan bool
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}
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func NewPeer(conn net.Conn, server *Server) *Peer {
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return &Peer{
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outputQueue: make(chan OutMsg, 1), // Buffered chan of 1 is enough
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quit: make(chan bool),
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server: server,
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conn: conn,
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}
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}
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// Outputs any RLP encoded data to the peer
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func (p *Peer) QueueMessage(msgType string, data []byte) {
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p.outputQueue <- OutMsg{msgType: msgType, data: data}
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}
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// Outbound message handler. Outbound messages are handled here
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func (p *Peer) HandleOutbound() {
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out:
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for {
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select {
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// Main message queue. All outbound messages are processed through here
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case msg := <-p.outputQueue:
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// TODO Message checking and handle accordingly
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p.WriteMessage(msg)
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// Break out of the for loop if a quit message is posted
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case <- p.quit:
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break out
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}
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}
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}
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// Write a message to the peer.
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func (p *Peer) WriteMessage(msg OutMsg) {
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// Encode the type and the (RLP encoded) data for sending over the wire
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encoded := Encode([]interface{}{ msg.msgType, msg.data })
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// Write to the connection
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_, err := p.conn.Write(encoded)
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if err != nil {
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log.Println(err)
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p.Stop()
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}
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}
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// Inbound handler. Inbound messages are received here and passed to the appropriate methods
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func (p *Peer) HandleInbound() {
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defer p.Stop()
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out:
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for {
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// Wait for a message from the peer
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msg, err := ReadMessage(p.conn)
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if err != nil {
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log.Println(err)
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break out
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}
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// TODO
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data, _ := Decode(msg.data, 0)
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log.Printf("%s, %s\n", msg.msgType, data)
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}
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// Notify the out handler we're quiting
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p.quit <- true
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}
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func (p *Peer) Start() {
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// Run the outbound handler in a new goroutine
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go p.HandleOutbound()
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// Run the inbound handler in a new goroutine
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go p.HandleInbound()
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}
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func (p *Peer) Stop() {
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defer p.conn.Close()
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p.quit <- true
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}
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