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peermanager.go
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peermanager.go
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package peermanager
import (
"context"
bsmsg "github.com/ipfs/go-bitswap/message"
wantlist "github.com/ipfs/go-bitswap/wantlist"
logging "github.com/ipfs/go-log"
peer "github.com/libp2p/go-libp2p-peer"
)
var log = logging.Logger("bitswap")
var (
metricsBuckets = []float64{1 << 6, 1 << 10, 1 << 14, 1 << 18, 1<<18 + 15, 1 << 22}
)
// PeerQueue provides a queer of messages to be sent for a single peer.
type PeerQueue interface {
RefIncrement()
RefDecrement() bool
AddMessage(entries []*bsmsg.Entry, ses uint64)
Startup(ctx context.Context, initialEntries []*wantlist.Entry)
Shutdown()
}
// PeerQueueFactory provides a function that will create a PeerQueue.
type PeerQueueFactory func(p peer.ID) PeerQueue
type peerMessage interface {
handle(pm *PeerManager)
}
// PeerManager manages a pool of peers and sends messages to peers in the pool.
type PeerManager struct {
// sync channel for Run loop
peerMessages chan peerMessage
// synchronized by Run loop, only touch inside there
peerQueues map[peer.ID]PeerQueue
createPeerQueue PeerQueueFactory
ctx context.Context
cancel func()
}
// New creates a new PeerManager, given a context and a peerQueueFactory.
func New(ctx context.Context, createPeerQueue PeerQueueFactory) *PeerManager {
ctx, cancel := context.WithCancel(ctx)
return &PeerManager{
peerMessages: make(chan peerMessage, 10),
peerQueues: make(map[peer.ID]PeerQueue),
createPeerQueue: createPeerQueue,
ctx: ctx,
cancel: cancel,
}
}
// ConnectedPeers returns a list of peers this PeerManager is managing.
func (pm *PeerManager) ConnectedPeers() []peer.ID {
resp := make(chan []peer.ID)
pm.peerMessages <- &getPeersMessage{resp}
return <-resp
}
// Connected is called to add a new peer to the pool, and send it an initial set
// of wants.
func (pm *PeerManager) Connected(p peer.ID, initialEntries []*wantlist.Entry) {
select {
case pm.peerMessages <- &connectPeerMessage{p, initialEntries}:
case <-pm.ctx.Done():
}
}
// Disconnected is called to remove a peer from the pool.
func (pm *PeerManager) Disconnected(p peer.ID) {
select {
case pm.peerMessages <- &disconnectPeerMessage{p}:
case <-pm.ctx.Done():
}
}
// SendMessage is called to send a message to all or some peers in the pool;
// if targets is nil, it sends to all.
func (pm *PeerManager) SendMessage(entries []*bsmsg.Entry, targets []peer.ID, from uint64) {
select {
case pm.peerMessages <- &sendPeerMessage{entries: entries, targets: targets, from: from}:
case <-pm.ctx.Done():
}
}
// Startup enables the run loop for the PeerManager - no processing will occur
// if startup is not called.
func (pm *PeerManager) Startup() {
go pm.run()
}
// Shutdown shutsdown processing for the PeerManager.
func (pm *PeerManager) Shutdown() {
pm.cancel()
}
func (pm *PeerManager) run() {
for {
select {
case message := <-pm.peerMessages:
message.handle(pm)
case <-pm.ctx.Done():
return
}
}
}
type sendPeerMessage struct {
entries []*bsmsg.Entry
targets []peer.ID
from uint64
}
func (s *sendPeerMessage) handle(pm *PeerManager) {
pm.sendMessage(s)
}
type connectPeerMessage struct {
p peer.ID
initialEntries []*wantlist.Entry
}
func (c *connectPeerMessage) handle(pm *PeerManager) {
pm.startPeerHandler(c.p, c.initialEntries)
}
type disconnectPeerMessage struct {
p peer.ID
}
func (dc *disconnectPeerMessage) handle(pm *PeerManager) {
pm.stopPeerHandler(dc.p)
}
type getPeersMessage struct {
peerResp chan<- []peer.ID
}
func (gp *getPeersMessage) handle(pm *PeerManager) {
pm.getPeers(gp.peerResp)
}
func (pm *PeerManager) getPeers(peerResp chan<- []peer.ID) {
peers := make([]peer.ID, 0, len(pm.peerQueues))
for p := range pm.peerQueues {
peers = append(peers, p)
}
peerResp <- peers
}
func (pm *PeerManager) startPeerHandler(p peer.ID, initialEntries []*wantlist.Entry) PeerQueue {
mq, ok := pm.peerQueues[p]
if ok {
mq.RefIncrement()
return nil
}
mq = pm.createPeerQueue(p)
pm.peerQueues[p] = mq
mq.Startup(pm.ctx, initialEntries)
return mq
}
func (pm *PeerManager) stopPeerHandler(p peer.ID) {
pq, ok := pm.peerQueues[p]
if !ok {
// TODO: log error?
return
}
if pq.RefDecrement() {
return
}
pq.Shutdown()
delete(pm.peerQueues, p)
}
func (pm *PeerManager) sendMessage(ms *sendPeerMessage) {
if len(ms.targets) == 0 {
for _, p := range pm.peerQueues {
p.AddMessage(ms.entries, ms.from)
}
} else {
for _, t := range ms.targets {
p, ok := pm.peerQueues[t]
if !ok {
log.Infof("tried sending wantlist change to non-partner peer: %s", t)
continue
}
p.AddMessage(ms.entries, ms.from)
}
}
}