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173 lines
3.8 KiB
173 lines
3.8 KiB
package peer
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import (
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. "github.com/tendermint/tendermint/common"
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. "github.com/tendermint/tendermint/binary"
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"atomic"
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"sync"
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"net"
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"runtime"
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"fmt"
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"time"
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)
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const (
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OUT_QUEUE_SIZE = 50
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IDLE_TIMEOUT_MINUTES = 5
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PING_TIMEOUT_MINUTES = 2
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)
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/* Connnection */
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type Connection struct {
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ioStats IOStats
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outQueue chan ByteSlice // never closes.
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conn net.Conn
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quit chan struct{}
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stopped int32
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pingDebouncer *Debouncer
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pong chan struct{}
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}
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var (
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PACKET_TYPE_PING = UInt8(0x00)
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PACKET_TYPE_PONG = UInt8(0x01)
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PACKET_TYPE_MSG = UInt8(0x10)
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)
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func NewConnection(conn net.Conn) *Connection {
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return &Connection{
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outQueue: make(chan ByteSlice, OUT_QUEUE_SIZE),
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conn: conn,
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quit: make(chan struct{}),
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pingDebouncer: NewDebouncer(PING_TIMEOUT_MINUTES * time.Minute),
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pong: make(chan struct{}),
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}
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}
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// returns true if successfully queued,
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// returns false if connection was closed.
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// blocks.
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func (c *Connection) QueueOut(msg ByteSlice) bool {
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select {
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case c.outQueue <- msg:
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return true
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case <-c.quit:
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return false
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}
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}
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func (c *Connection) Start() {
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go c.outHandler()
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go c.inHandler()
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}
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func (c *Connection) Stop() {
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if atomic.SwapAndCompare(&c.stopped, 0, 1) {
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close(c.quit)
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c.conn.Close()
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c.pingDebouncer.Stop()
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// We can't close pong safely here because
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// inHandler may write to it after we've stopped.
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// Though it doesn't need to get closed at all,
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// we close it @ inHandler.
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// close(c.pong)
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}
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}
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func (c *Connection) LocalAddress() *NetAddress {
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return NewNetAddress(c.conn.LocalAddr())
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}
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func (c *Connection) RemoteAddress() *NetAddress {
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return NewNetAddress(c.conn.RemoteAddr())
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}
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func (c *Connection) flush() {
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// TODO flush? (turn off nagel, turn back on, etc)
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}
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func (c *Connection) outHandler() {
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FOR_LOOP:
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for {
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var err error
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select {
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case <-c.pingDebouncer.Ch:
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_, err = PACKET_TYPE_PING.WriteTo(c.conn)
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case outMsg := <-c.outQueue:
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_, err = outMsg.WriteTo(c.conn)
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case <-c.pong:
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_, err = PACKET_TYPE_PONG.WriteTo(c.conn)
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case <-c.quit:
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break FOR_LOOP
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}
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if err != nil {
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log.Infof("Connection %v failed @ outHandler:\n%v", c, err)
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c.Stop()
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break FOR_LOOP
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}
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c.flush()
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}
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}
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func (c *Connection) inHandler() {
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FOR_LOOP:
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for {
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msgType, err := ReadUInt8Safe(c.conn)
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if err != nil {
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if atomic.LoadUint32(&c.stopped) != 1 {
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log.Infof("Connection %v failed @ inHandler", c)
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c.Stop()
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}
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break FOR_LOOP
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}
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switch msgType {
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case PACKET_TYPE_PING:
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c.pong <- struct{}{}
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case PACKET_TYPE_PONG:
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// do nothing
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case PACKET_TYPE_MSG:
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msg, err := ReadByteSliceSafe(c.conn)
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if err != nil {
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if atomic.LoadUint32(&c.stopped) != 1 {
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log.Infof("Connection %v failed @ inHandler", c)
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c.Stop()
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}
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break FOR_LOOP
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}
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// What to do?
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// TODO
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default:
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Panicf("Unknown message type %v", msgType)
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}
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c.pingDebouncer.Reset()
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}
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// cleanup
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close(c.pong)
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for _ = range c.pong {
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// drain
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}
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}
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/* IOStats */
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type IOStats struct {
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TimeConnected Time
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LastSent Time
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LastRecv Time
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BytesRecv UInt64
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BytesSent UInt64
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MsgsRecv UInt64
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MsgsSent UInt64
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}
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