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notifications.go
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notifications.go
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// Copyright (c) 2013-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
// NOTE: THIS API IS UNSTABLE RIGHT NOW.
package neutrino
import (
"errors"
"github.com/gcash/bchd/addrmgr"
"github.com/gcash/bchd/connmgr"
)
type getConnCountMsg struct {
reply chan int32
}
type getPeersMsg struct {
reply chan []*ServerPeer
}
type getOutboundGroup struct {
key string
reply chan int
}
type getAddedNodesMsg struct {
reply chan []*ServerPeer
}
type disconnectNodeMsg struct {
cmp func(*ServerPeer) bool
reply chan error
}
type connectNodeMsg struct {
addr string
permanent bool
reply chan error
}
type removeNodeMsg struct {
cmp func(*ServerPeer) bool
reply chan error
}
type forAllPeersMsg struct {
closure func(*ServerPeer)
}
// TODO: General - abstract out more of blockmanager into queries. It'll make
// this way more maintainable and usable.
// handleQuery is the central handler for all queries and commands from other
// goroutines related to peer state.
func (s *ChainService) handleQuery(state *peerState, querymsg interface{}) {
switch msg := querymsg.(type) {
case getConnCountMsg:
nconnected := int32(0)
state.forAllPeers(func(sp *ServerPeer) {
if sp.Connected() {
nconnected++
}
})
msg.reply <- nconnected
case getPeersMsg:
peers := make([]*ServerPeer, 0, state.Count())
state.forAllPeers(func(sp *ServerPeer) {
if !sp.Connected() {
return
}
peers = append(peers, sp)
})
msg.reply <- peers
case connectNodeMsg:
// TODO: duplicate oneshots?
// Limit max number of total peers.
if state.Count() >= MaxPeers {
msg.reply <- errors.New("max peers reached")
return
}
for _, peer := range state.persistentPeers {
if peer.Addr() == msg.addr {
if msg.permanent {
msg.reply <- errors.New("peer already connected")
} else {
msg.reply <- errors.New("peer exists as a permanent peer")
}
return
}
}
netAddr, err := s.addrStringToNetAddr(msg.addr)
if err != nil {
msg.reply <- err
return
}
// TODO: if too many, nuke a non-perm peer.
go s.connManager.Connect(&connmgr.ConnReq{
Addr: netAddr,
Permanent: msg.permanent,
})
msg.reply <- nil
case removeNodeMsg:
found := disconnectPeer(state.persistentPeers, msg.cmp, func(sp *ServerPeer) {
// Keep group counts ok since we remove from
// the list now.
state.outboundGroups[addrmgr.GroupKey(sp.NA())]--
})
if found {
msg.reply <- nil
} else {
msg.reply <- errors.New("peer not found")
}
case getOutboundGroup:
count, ok := state.outboundGroups[msg.key]
if ok {
msg.reply <- count
} else {
msg.reply <- 0
}
// Request a list of the persistent (added) peers.
case getAddedNodesMsg:
// Respond with a slice of the relavent peers.
peers := make([]*ServerPeer, 0, len(state.persistentPeers))
for _, sp := range state.persistentPeers {
peers = append(peers, sp)
}
msg.reply <- peers
case disconnectNodeMsg:
// Check outbound peers.
found := disconnectPeer(state.outboundPeers, msg.cmp, func(sp *ServerPeer) {
// Keep group counts ok since we remove from
// the list now.
state.outboundGroups[addrmgr.GroupKey(sp.NA())]--
})
if found {
// If there are multiple outbound connections to the same
// ip:port, continue disconnecting them all until no such
// peers are found.
for found {
found = disconnectPeer(state.outboundPeers, msg.cmp, func(sp *ServerPeer) {
state.outboundGroups[addrmgr.GroupKey(sp.NA())]--
})
}
msg.reply <- nil
return
}
msg.reply <- errors.New("peer not found")
case forAllPeersMsg:
// TODO: Remove this when it's unnecessary due to wider use of
// queryPeers.
// Run the closure on all peers in the passed state.
state.forAllPeers(msg.closure)
// Even though this is a query, there's no reply channel as the
// forAllPeers method doesn't return anything. An error might be
// useful in the future.
}
}
// ConnectedCount returns the number of currently connected peers.
func (s *ChainService) ConnectedCount() int32 {
replyChan := make(chan int32)
select {
case s.query <- getConnCountMsg{reply: replyChan}:
return <-replyChan
case <-s.quit:
return 0
}
}
// OutboundGroupCount returns the number of peers connected to the given
// outbound group key.
func (s *ChainService) OutboundGroupCount(key string) int {
replyChan := make(chan int)
select {
case s.query <- getOutboundGroup{key: key, reply: replyChan}:
return <-replyChan
case <-s.quit:
return 0
}
}
// AddedNodeInfo returns an array of btcjson.GetAddedNodeInfoResult structures
// describing the persistent (added) nodes.
func (s *ChainService) AddedNodeInfo() []*ServerPeer {
replyChan := make(chan []*ServerPeer)
select {
case s.query <- getAddedNodesMsg{reply: replyChan}:
return <-replyChan
case <-s.quit:
return nil
}
}
// Peers returns an array of all connected peers.
func (s *ChainService) Peers() []*ServerPeer {
replyChan := make(chan []*ServerPeer)
select {
case s.query <- getPeersMsg{reply: replyChan}:
return <-replyChan
case <-s.quit:
return nil
}
}
// DisconnectNodeByAddr disconnects a peer by target address. Both outbound and
// inbound nodes will be searched for the target node. An error message will
// be returned if the peer was not found.
func (s *ChainService) DisconnectNodeByAddr(addr string) error {
replyChan := make(chan error)
select {
case s.query <- disconnectNodeMsg{
cmp: func(sp *ServerPeer) bool { return sp.Addr() == addr },
reply: replyChan,
}:
return <-replyChan
case <-s.quit:
return nil
}
}
// DisconnectNodeByID disconnects a peer by target node id. Both outbound and
// inbound nodes will be searched for the target node. An error message will be
// returned if the peer was not found.
func (s *ChainService) DisconnectNodeByID(id int32) error {
replyChan := make(chan error)
select {
case s.query <- disconnectNodeMsg{
cmp: func(sp *ServerPeer) bool { return sp.ID() == id },
reply: replyChan,
}:
return <-replyChan
case <-s.quit:
return nil
}
}
// RemoveNodeByAddr removes a peer from the list of persistent peers if
// present. An error will be returned if the peer was not found.
func (s *ChainService) RemoveNodeByAddr(addr string) error {
replyChan := make(chan error)
select {
case s.query <- removeNodeMsg{
cmp: func(sp *ServerPeer) bool { return sp.Addr() == addr },
reply: replyChan,
}:
return <-replyChan
case <-s.quit:
return nil
}
}
// RemoveNodeByID removes a peer by node ID from the list of persistent peers
// if present. An error will be returned if the peer was not found.
func (s *ChainService) RemoveNodeByID(id int32) error {
replyChan := make(chan error)
select {
case s.query <- removeNodeMsg{
cmp: func(sp *ServerPeer) bool { return sp.ID() == id },
reply: replyChan,
}:
return <-replyChan
case <-s.quit:
return nil
}
}
// ConnectNode adds `addr' as a new outbound peer. If permanent is true then the
// peer will be persistent and reconnect if the connection is lost.
// It is an error to call this with an already existing peer.
func (s *ChainService) ConnectNode(addr string, permanent bool) error {
replyChan := make(chan error)
select {
case s.query <- connectNodeMsg{
addr: addr,
permanent: permanent,
reply: replyChan,
}:
return <-replyChan
case <-s.quit:
return nil
}
}
// ForAllPeers runs a closure over all peers (outbound and persistent) to which
// the ChainService is connected. Nothing is returned because the peerState's
// ForAllPeers method doesn't return anything as the closure passed to it
// doesn't return anything.
func (s *ChainService) ForAllPeers(closure func(sp *ServerPeer)) {
select {
case s.query <- forAllPeersMsg{closure: closure}:
case <-s.quit:
}
}