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171 lines
4.2 KiB
171 lines
4.2 KiB
package peer
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import (
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. "github.com/tendermint/tendermint/binary"
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"github.com/tendermint/tendermint/merkle"
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"atomic"
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"sync"
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"io"
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"errors"
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)
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/* Client
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A client is half of a p2p system.
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It can reach out to the network and establish connections with servers.
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A client doesn't listen for incoming connections -- that's done by the server.
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newPeerCb is a factory method for generating new peers from new *Connections.
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newPeerCb(nil) must return a prototypical peer that represents the self "peer".
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XXX what about peer disconnects?
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*/
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type Client struct {
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addrBook AddrBook
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targetNumPeers int
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newPeerCb func(*Connection) *Peer
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self *Peer
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inQueues map[String]chan *InboundMsg
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mtx sync.Mutex
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peers merkle.Tree // addr -> *Peer
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quit chan struct{}
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stopped uint32
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}
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var (
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CLIENT_STOPPED_ERROR = errors.New("Client already stopped")
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CLIENT_DUPLICATE_PEER_ERROR = errors.New("Duplicate peer")
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)
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func NewClient(newPeerCb func(*Connect) *Peer) *Client {
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self := newPeerCb(nil)
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if self == nil {
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Panicf("newPeerCb(nil) must return a prototypical peer for self")
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}
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inQueues := make(map[String]chan *InboundMsg)
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for chName, channel := peer.channels {
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inQueues[chName] = make(chan *InboundMsg)
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}
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c := &Client{
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newPeerCb: newPeerCb,
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peers: merkle.NewIAVLTree(nil),
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self: self,
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inQueues: inQueues,
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}
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return c
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}
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func (c *Client) Stop() {
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// lock
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c.mtx.Lock()
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if atomic.CompareAndSwapUint32(&c.stopped, 0, 1) {
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close(c.quit)
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// stop each peer.
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for peerValue := range c.peers.Values() {
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peer := peerValue.(*Peer)
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peer.Stop()
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}
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// empty tree.
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c.peers = merkle.NewIAVLTree(nil)
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}
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c.mtx.Unlock()
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// unlock
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}
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func (c *Client) AddPeerWithConnection(conn *Connection, outgoing bool) (*Peer, error) {
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if atomic.LoadUint32(&c.stopped) == 1 { return nil, CLIENT_STOPPED_ERROR }
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peer := c.newPeerCb(conn)
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peer.outgoing = outgoing
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err := c.addPeer(peer)
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if err != nil { return nil, err }
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go peer.Start(c.inQueues)
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return peer, nil
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}
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func (c *Client) Broadcast(chName String, msg Msg) {
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if atomic.LoadUint32(&c.stopped) == 1 { return }
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for v := range c.peersCopy().Values() {
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peer := v.(*Peer)
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success := peer.TryQueueOut(chName , msg)
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if !success {
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// TODO: notify the peer
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}
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}
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}
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func (c *Client) PopMessage(chName String) *InboundMsg {
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if atomic.LoadUint32(&c.stopped) == 1 { return nil }
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channel := c.Channel(chName)
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q := c.inQueues[chName]
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if q == nil { Panicf("Expected inQueues[%f], found none", chName) }
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for {
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select {
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case <-quit:
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return nil
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case msg := <-q:
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// skip if known.
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if channel.Filter().Has(msg) {
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continue
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}
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return msg
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}
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}
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}
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// Updates self's filter for a channel & broadcasts it.
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// TODO: maybe don't expose this
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func (c *Client) UpdateFilter(chName String, filter Filter) {
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if atomic.LoadUint32(&c.stopped) == 1 { return }
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c.self.Channel(chName).UpdateFilter(filter)
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c.Broadcast("", &NewFilterMsg{
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Channel: chName,
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Filter: filter,
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})
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}
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func (c *Client) StopPeer(peer *Peer) {
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// lock
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c.mtx.Lock()
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p, _ := c.peers.Remove(peer.RemoteAddress())
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c.mtx.Unlock()
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// unlock
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if p != nil {
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p.Stop()
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}
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}
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func (c *Client) addPeer(peer *Peer) error {
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addr := peer.RemoteAddress()
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// lock & defer
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c.mtx.Lock(); defer c.mtx.Unlock()
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if c.stopped == 1 { return CLIENT_STOPPED_ERROR }
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if !c.peers.Has(addr) {
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c.peers.Put(addr, peer)
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return nil
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} else {
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// ignore duplicate peer for addr.
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log.Infof("Ignoring duplicate peer for addr %v", addr)
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return CLIENT_DUPLICATE_PEER_ERROR
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}
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// unlock deferred
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}
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func (c *Client) peersCopy() merkle.Tree {
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// lock & defer
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c.mtx.Lock(); defer c.mtx.Unlock()
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return c.peers.Copy()
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// unlock deferred
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}
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