mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-29 18:05:18 +00:00
726 lines
19 KiB
Go
726 lines
19 KiB
Go
package connmgr
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import (
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"context"
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"sort"
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"sync"
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"sync/atomic"
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"time"
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"github.com/benbjohnson/clock"
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"github.com/libp2p/go-libp2p/core/connmgr"
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"github.com/libp2p/go-libp2p/core/network"
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"github.com/libp2p/go-libp2p/core/peer"
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logging "github.com/ipfs/go-log/v2"
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ma "github.com/multiformats/go-multiaddr"
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)
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var log = logging.Logger("connmgr")
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// BasicConnMgr is a ConnManager that trims connections whenever the count exceeds the
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// high watermark. New connections are given a grace period before they're subject
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// to trimming. Trims are automatically run on demand, only if the time from the
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// previous trim is higher than 10 seconds. Furthermore, trims can be explicitly
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// requested through the public interface of this struct (see TrimOpenConns).
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//
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// See configuration parameters in NewConnManager.
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type BasicConnMgr struct {
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*decayer
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clock clock.Clock
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cfg *config
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segments segments
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plk sync.RWMutex
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protected map[peer.ID]map[string]struct{}
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// channel-based semaphore that enforces only a single trim is in progress
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trimMutex sync.Mutex
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connCount atomic.Int32
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// to be accessed atomically. This is mimicking the implementation of a sync.Once.
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// Take care of correct alignment when modifying this struct.
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trimCount uint64
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lastTrimMu sync.RWMutex
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lastTrim time.Time
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refCount sync.WaitGroup
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ctx context.Context
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cancel func()
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unregisterMemoryWatcher func()
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}
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var (
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_ connmgr.ConnManager = (*BasicConnMgr)(nil)
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_ connmgr.Decayer = (*BasicConnMgr)(nil)
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)
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type segment struct {
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sync.Mutex
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peers map[peer.ID]*peerInfo
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}
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type segments struct {
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// bucketsMu is used to prevent deadlocks when concurrent processes try to
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// grab multiple segment locks at once. If you need multiple segment locks
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// at once, you should grab this lock first. You may release this lock once
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// you have the segment locks.
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bucketsMu sync.Mutex
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buckets [256]*segment
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}
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func (ss *segments) get(p peer.ID) *segment {
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return ss.buckets[byte(p[len(p)-1])]
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}
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func (ss *segments) countPeers() (count int) {
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for _, seg := range ss.buckets {
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seg.Lock()
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count += len(seg.peers)
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seg.Unlock()
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}
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return count
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}
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func (s *segment) tagInfoFor(p peer.ID, now time.Time) *peerInfo {
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pi, ok := s.peers[p]
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if ok {
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return pi
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}
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// create a temporary peer to buffer early tags before the Connected notification arrives.
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pi = &peerInfo{
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id: p,
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firstSeen: now, // this timestamp will be updated when the first Connected notification arrives.
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temp: true,
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tags: make(map[string]int),
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decaying: make(map[*decayingTag]*connmgr.DecayingValue),
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conns: make(map[network.Conn]time.Time),
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}
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s.peers[p] = pi
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return pi
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}
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// NewConnManager creates a new BasicConnMgr with the provided params:
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// lo and hi are watermarks governing the number of connections that'll be maintained.
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// When the peer count exceeds the 'high watermark', as many peers will be pruned (and
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// their connections terminated) until 'low watermark' peers remain.
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func NewConnManager(low, hi int, opts ...Option) (*BasicConnMgr, error) {
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cfg := &config{
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highWater: hi,
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lowWater: low,
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gracePeriod: time.Minute,
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silencePeriod: 10 * time.Second,
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clock: clock.New(),
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}
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for _, o := range opts {
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if err := o(cfg); err != nil {
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return nil, err
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}
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}
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if cfg.decayer == nil {
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// Set the default decayer config.
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cfg.decayer = (&DecayerCfg{}).WithDefaults()
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}
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cm := &BasicConnMgr{
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cfg: cfg,
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clock: cfg.clock,
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protected: make(map[peer.ID]map[string]struct{}, 16),
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segments: segments{},
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}
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for i := range cm.segments.buckets {
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cm.segments.buckets[i] = &segment{
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peers: make(map[peer.ID]*peerInfo),
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}
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}
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cm.ctx, cm.cancel = context.WithCancel(context.Background())
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if cfg.emergencyTrim {
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// When we're running low on memory, immediately trigger a trim.
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cm.unregisterMemoryWatcher = registerWatchdog(cm.memoryEmergency)
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}
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decay, _ := NewDecayer(cfg.decayer, cm)
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cm.decayer = decay
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cm.refCount.Add(1)
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go cm.background()
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return cm, nil
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}
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// memoryEmergency is run when we run low on memory.
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// Close connections until we right the low watermark.
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// We don't pay attention to the silence period or the grace period.
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// We try to not kill protected connections, but if that turns out to be necessary, not connection is safe!
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func (cm *BasicConnMgr) memoryEmergency() {
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connCount := int(cm.connCount.Load())
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target := connCount - cm.cfg.lowWater
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if target < 0 {
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log.Warnw("Low on memory, but we only have a few connections", "num", connCount, "low watermark", cm.cfg.lowWater)
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return
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} else {
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log.Warnf("Low on memory. Closing %d connections.", target)
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}
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cm.trimMutex.Lock()
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defer atomic.AddUint64(&cm.trimCount, 1)
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defer cm.trimMutex.Unlock()
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// Trim connections without paying attention to the silence period.
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for _, c := range cm.getConnsToCloseEmergency(target) {
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log.Infow("low on memory. closing conn", "peer", c.RemotePeer())
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c.Close()
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}
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// finally, update the last trim time.
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cm.lastTrimMu.Lock()
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cm.lastTrim = cm.clock.Now()
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cm.lastTrimMu.Unlock()
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}
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func (cm *BasicConnMgr) Close() error {
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cm.cancel()
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if cm.unregisterMemoryWatcher != nil {
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cm.unregisterMemoryWatcher()
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}
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if err := cm.decayer.Close(); err != nil {
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return err
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}
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cm.refCount.Wait()
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return nil
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}
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func (cm *BasicConnMgr) Protect(id peer.ID, tag string) {
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cm.plk.Lock()
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defer cm.plk.Unlock()
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tags, ok := cm.protected[id]
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if !ok {
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tags = make(map[string]struct{}, 2)
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cm.protected[id] = tags
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}
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tags[tag] = struct{}{}
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}
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func (cm *BasicConnMgr) Unprotect(id peer.ID, tag string) (protected bool) {
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cm.plk.Lock()
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defer cm.plk.Unlock()
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tags, ok := cm.protected[id]
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if !ok {
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return false
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}
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if delete(tags, tag); len(tags) == 0 {
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delete(cm.protected, id)
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return false
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}
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return true
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}
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func (cm *BasicConnMgr) IsProtected(id peer.ID, tag string) (protected bool) {
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cm.plk.Lock()
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defer cm.plk.Unlock()
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tags, ok := cm.protected[id]
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if !ok {
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return false
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}
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if tag == "" {
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return true
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}
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_, protected = tags[tag]
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return protected
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}
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// peerInfo stores metadata for a given peer.
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type peerInfo struct {
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id peer.ID
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tags map[string]int // value for each tag
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decaying map[*decayingTag]*connmgr.DecayingValue // decaying tags
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value int // cached sum of all tag values
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temp bool // this is a temporary entry holding early tags, and awaiting connections
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conns map[network.Conn]time.Time // start time of each connection
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firstSeen time.Time // timestamp when we began tracking this peer.
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}
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type peerInfos []*peerInfo
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// SortByValueAndStreams sorts peerInfos by their value and stream count. It
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// will sort peers with no streams before those with streams (all else being
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// equal). If `sortByMoreStreams` is true it will sort peers with more streams
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// before those with fewer streams. This is useful to prioritize freeing memory.
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func (p peerInfos) SortByValueAndStreams(segments *segments, sortByMoreStreams bool) {
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sort.Slice(p, func(i, j int) bool {
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left, right := p[i], p[j]
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// Grab this lock so that we can grab both segment locks below without deadlocking.
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segments.bucketsMu.Lock()
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// lock this to protect from concurrent modifications from connect/disconnect events
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leftSegment := segments.get(left.id)
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leftSegment.Lock()
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defer leftSegment.Unlock()
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rightSegment := segments.get(right.id)
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if leftSegment != rightSegment {
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// These two peers are not in the same segment, lets get the lock
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rightSegment.Lock()
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defer rightSegment.Unlock()
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}
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segments.bucketsMu.Unlock()
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// temporary peers are preferred for pruning.
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if left.temp != right.temp {
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return left.temp
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}
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// otherwise, compare by value.
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if left.value != right.value {
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return left.value < right.value
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}
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incomingAndStreams := func(m map[network.Conn]time.Time) (incoming bool, numStreams int) {
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for c := range m {
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stat := c.Stat()
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if stat.Direction == network.DirInbound {
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incoming = true
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}
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numStreams += stat.NumStreams
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}
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return
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}
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leftIncoming, leftStreams := incomingAndStreams(left.conns)
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rightIncoming, rightStreams := incomingAndStreams(right.conns)
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// prefer closing inactive connections (no streams open)
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if rightStreams != leftStreams && (leftStreams == 0 || rightStreams == 0) {
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return leftStreams < rightStreams
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}
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// incoming connections are preferred for pruning
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if leftIncoming != rightIncoming {
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return leftIncoming
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}
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if sortByMoreStreams {
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// prune connections with a higher number of streams first
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return rightStreams < leftStreams
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} else {
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return leftStreams < rightStreams
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}
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})
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}
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// TrimOpenConns closes the connections of as many peers as needed to make the peer count
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// equal the low watermark. Peers are sorted in ascending order based on their total value,
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// pruning those peers with the lowest scores first, as long as they are not within their
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// grace period.
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//
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// This function blocks until a trim is completed. If a trim is underway, a new
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// one won't be started, and instead it'll wait until that one is completed before
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// returning.
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func (cm *BasicConnMgr) TrimOpenConns(_ context.Context) {
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// TODO: error return value so we can cleanly signal we are aborting because:
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// (a) there's another trim in progress, or (b) the silence period is in effect.
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cm.doTrim()
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}
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func (cm *BasicConnMgr) background() {
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defer cm.refCount.Done()
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interval := cm.cfg.gracePeriod / 2
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if cm.cfg.silencePeriod != 0 {
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interval = cm.cfg.silencePeriod
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}
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ticker := cm.clock.Ticker(interval)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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if cm.connCount.Load() < int32(cm.cfg.highWater) {
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// Below high water, skip.
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continue
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}
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case <-cm.ctx.Done():
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return
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}
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cm.trim()
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}
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}
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func (cm *BasicConnMgr) doTrim() {
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// This logic is mimicking the implementation of sync.Once in the standard library.
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count := atomic.LoadUint64(&cm.trimCount)
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cm.trimMutex.Lock()
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defer cm.trimMutex.Unlock()
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if count == atomic.LoadUint64(&cm.trimCount) {
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cm.trim()
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cm.lastTrimMu.Lock()
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cm.lastTrim = cm.clock.Now()
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cm.lastTrimMu.Unlock()
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atomic.AddUint64(&cm.trimCount, 1)
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}
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}
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// trim starts the trim, if the last trim happened before the configured silence period.
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func (cm *BasicConnMgr) trim() {
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// do the actual trim.
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for _, c := range cm.getConnsToClose() {
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log.Debugw("closing conn", "peer", c.RemotePeer())
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c.Close()
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}
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}
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func (cm *BasicConnMgr) getConnsToCloseEmergency(target int) []network.Conn {
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candidates := make(peerInfos, 0, cm.segments.countPeers())
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cm.plk.RLock()
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for _, s := range cm.segments.buckets {
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s.Lock()
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for id, inf := range s.peers {
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if _, ok := cm.protected[id]; ok {
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// skip over protected peer.
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continue
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}
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candidates = append(candidates, inf)
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}
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s.Unlock()
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}
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cm.plk.RUnlock()
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// Sort peers according to their value.
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candidates.SortByValueAndStreams(&cm.segments, true)
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selected := make([]network.Conn, 0, target+10)
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for _, inf := range candidates {
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if target <= 0 {
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break
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}
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s := cm.segments.get(inf.id)
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s.Lock()
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for c := range inf.conns {
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selected = append(selected, c)
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}
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target -= len(inf.conns)
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s.Unlock()
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}
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if len(selected) >= target {
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// We found enough connections that were not protected.
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return selected
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}
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// We didn't find enough unprotected connections.
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// We have no choice but to kill some protected connections.
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candidates = candidates[:0]
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cm.plk.RLock()
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for _, s := range cm.segments.buckets {
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s.Lock()
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for _, inf := range s.peers {
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candidates = append(candidates, inf)
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}
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s.Unlock()
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}
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cm.plk.RUnlock()
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candidates.SortByValueAndStreams(&cm.segments, true)
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for _, inf := range candidates {
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if target <= 0 {
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break
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}
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// lock this to protect from concurrent modifications from connect/disconnect events
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s := cm.segments.get(inf.id)
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s.Lock()
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for c := range inf.conns {
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selected = append(selected, c)
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}
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target -= len(inf.conns)
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s.Unlock()
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}
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return selected
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}
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// getConnsToClose runs the heuristics described in TrimOpenConns and returns the
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// connections to close.
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func (cm *BasicConnMgr) getConnsToClose() []network.Conn {
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if cm.cfg.lowWater == 0 || cm.cfg.highWater == 0 {
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// disabled
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return nil
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}
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if int(cm.connCount.Load()) <= cm.cfg.lowWater {
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log.Info("open connection count below limit")
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return nil
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}
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candidates := make(peerInfos, 0, cm.segments.countPeers())
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var ncandidates int
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gracePeriodStart := cm.clock.Now().Add(-cm.cfg.gracePeriod)
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cm.plk.RLock()
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for _, s := range cm.segments.buckets {
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s.Lock()
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for id, inf := range s.peers {
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if _, ok := cm.protected[id]; ok {
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// skip over protected peer.
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continue
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}
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if inf.firstSeen.After(gracePeriodStart) {
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// skip peers in the grace period.
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continue
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}
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// note that we're copying the entry here,
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// but since inf.conns is a map, it will still point to the original object
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candidates = append(candidates, inf)
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ncandidates += len(inf.conns)
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}
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s.Unlock()
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}
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cm.plk.RUnlock()
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if ncandidates < cm.cfg.lowWater {
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log.Info("open connection count above limit but too many are in the grace period")
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// We have too many connections but fewer than lowWater
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// connections out of the grace period.
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//
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// If we trimmed now, we'd kill potentially useful connections.
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return nil
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}
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// Sort peers according to their value.
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candidates.SortByValueAndStreams(&cm.segments, false)
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target := ncandidates - cm.cfg.lowWater
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// slightly overallocate because we may have more than one conns per peer
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selected := make([]network.Conn, 0, target+10)
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for _, inf := range candidates {
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if target <= 0 {
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break
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}
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// lock this to protect from concurrent modifications from connect/disconnect events
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s := cm.segments.get(inf.id)
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s.Lock()
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if len(inf.conns) == 0 && inf.temp {
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// handle temporary entries for early tags -- this entry has gone past the grace period
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// and still holds no connections, so prune it.
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delete(s.peers, inf.id)
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} else {
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for c := range inf.conns {
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selected = append(selected, c)
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}
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target -= len(inf.conns)
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}
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s.Unlock()
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}
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return selected
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}
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// GetTagInfo is called to fetch the tag information associated with a given
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// peer, nil is returned if p refers to an unknown peer.
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func (cm *BasicConnMgr) GetTagInfo(p peer.ID) *connmgr.TagInfo {
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s := cm.segments.get(p)
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s.Lock()
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defer s.Unlock()
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pi, ok := s.peers[p]
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if !ok {
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return nil
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}
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out := &connmgr.TagInfo{
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FirstSeen: pi.firstSeen,
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Value: pi.value,
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Tags: make(map[string]int),
|
|
Conns: make(map[string]time.Time),
|
|
}
|
|
|
|
for t, v := range pi.tags {
|
|
out.Tags[t] = v
|
|
}
|
|
for t, v := range pi.decaying {
|
|
out.Tags[t.name] = v.Value
|
|
}
|
|
for c, t := range pi.conns {
|
|
out.Conns[c.RemoteMultiaddr().String()] = t
|
|
}
|
|
|
|
return out
|
|
}
|
|
|
|
// TagPeer is called to associate a string and integer with a given peer.
|
|
func (cm *BasicConnMgr) TagPeer(p peer.ID, tag string, val int) {
|
|
s := cm.segments.get(p)
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
pi := s.tagInfoFor(p, cm.clock.Now())
|
|
|
|
// Update the total value of the peer.
|
|
pi.value += val - pi.tags[tag]
|
|
pi.tags[tag] = val
|
|
}
|
|
|
|
// UntagPeer is called to disassociate a string and integer from a given peer.
|
|
func (cm *BasicConnMgr) UntagPeer(p peer.ID, tag string) {
|
|
s := cm.segments.get(p)
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
pi, ok := s.peers[p]
|
|
if !ok {
|
|
log.Info("tried to remove tag from untracked peer: ", p)
|
|
return
|
|
}
|
|
|
|
// Update the total value of the peer.
|
|
pi.value -= pi.tags[tag]
|
|
delete(pi.tags, tag)
|
|
}
|
|
|
|
// UpsertTag is called to insert/update a peer tag
|
|
func (cm *BasicConnMgr) UpsertTag(p peer.ID, tag string, upsert func(int) int) {
|
|
s := cm.segments.get(p)
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
pi := s.tagInfoFor(p, cm.clock.Now())
|
|
|
|
oldval := pi.tags[tag]
|
|
newval := upsert(oldval)
|
|
pi.value += newval - oldval
|
|
pi.tags[tag] = newval
|
|
}
|
|
|
|
// CMInfo holds the configuration for BasicConnMgr, as well as status data.
|
|
type CMInfo struct {
|
|
// The low watermark, as described in NewConnManager.
|
|
LowWater int
|
|
|
|
// The high watermark, as described in NewConnManager.
|
|
HighWater int
|
|
|
|
// The timestamp when the last trim was triggered.
|
|
LastTrim time.Time
|
|
|
|
// The configured grace period, as described in NewConnManager.
|
|
GracePeriod time.Duration
|
|
|
|
// The current connection count.
|
|
ConnCount int
|
|
}
|
|
|
|
// GetInfo returns the configuration and status data for this connection manager.
|
|
func (cm *BasicConnMgr) GetInfo() CMInfo {
|
|
cm.lastTrimMu.RLock()
|
|
lastTrim := cm.lastTrim
|
|
cm.lastTrimMu.RUnlock()
|
|
|
|
return CMInfo{
|
|
HighWater: cm.cfg.highWater,
|
|
LowWater: cm.cfg.lowWater,
|
|
LastTrim: lastTrim,
|
|
GracePeriod: cm.cfg.gracePeriod,
|
|
ConnCount: int(cm.connCount.Load()),
|
|
}
|
|
}
|
|
|
|
// Notifee returns a sink through which Notifiers can inform the BasicConnMgr when
|
|
// events occur. Currently, the notifee only reacts upon connection events
|
|
// {Connected, Disconnected}.
|
|
func (cm *BasicConnMgr) Notifee() network.Notifiee {
|
|
return (*cmNotifee)(cm)
|
|
}
|
|
|
|
type cmNotifee BasicConnMgr
|
|
|
|
func (nn *cmNotifee) cm() *BasicConnMgr {
|
|
return (*BasicConnMgr)(nn)
|
|
}
|
|
|
|
// Connected is called by notifiers to inform that a new connection has been established.
|
|
// The notifee updates the BasicConnMgr to start tracking the connection. If the new connection
|
|
// count exceeds the high watermark, a trim may be triggered.
|
|
func (nn *cmNotifee) Connected(n network.Network, c network.Conn) {
|
|
cm := nn.cm()
|
|
|
|
p := c.RemotePeer()
|
|
s := cm.segments.get(p)
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
id := c.RemotePeer()
|
|
pinfo, ok := s.peers[id]
|
|
if !ok {
|
|
pinfo = &peerInfo{
|
|
id: id,
|
|
firstSeen: cm.clock.Now(),
|
|
tags: make(map[string]int),
|
|
decaying: make(map[*decayingTag]*connmgr.DecayingValue),
|
|
conns: make(map[network.Conn]time.Time),
|
|
}
|
|
s.peers[id] = pinfo
|
|
} else if pinfo.temp {
|
|
// we had created a temporary entry for this peer to buffer early tags before the
|
|
// Connected notification arrived: flip the temporary flag, and update the firstSeen
|
|
// timestamp to the real one.
|
|
pinfo.temp = false
|
|
pinfo.firstSeen = cm.clock.Now()
|
|
}
|
|
|
|
_, ok = pinfo.conns[c]
|
|
if ok {
|
|
log.Error("received connected notification for conn we are already tracking: ", p)
|
|
return
|
|
}
|
|
|
|
pinfo.conns[c] = cm.clock.Now()
|
|
cm.connCount.Add(1)
|
|
}
|
|
|
|
// Disconnected is called by notifiers to inform that an existing connection has been closed or terminated.
|
|
// The notifee updates the BasicConnMgr accordingly to stop tracking the connection, and performs housekeeping.
|
|
func (nn *cmNotifee) Disconnected(n network.Network, c network.Conn) {
|
|
cm := nn.cm()
|
|
|
|
p := c.RemotePeer()
|
|
s := cm.segments.get(p)
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
cinf, ok := s.peers[p]
|
|
if !ok {
|
|
log.Error("received disconnected notification for peer we are not tracking: ", p)
|
|
return
|
|
}
|
|
|
|
_, ok = cinf.conns[c]
|
|
if !ok {
|
|
log.Error("received disconnected notification for conn we are not tracking: ", p)
|
|
return
|
|
}
|
|
|
|
delete(cinf.conns, c)
|
|
if len(cinf.conns) == 0 {
|
|
delete(s.peers, p)
|
|
}
|
|
cm.connCount.Add(-1)
|
|
}
|
|
|
|
// Listen is no-op in this implementation.
|
|
func (nn *cmNotifee) Listen(n network.Network, addr ma.Multiaddr) {}
|
|
|
|
// ListenClose is no-op in this implementation.
|
|
func (nn *cmNotifee) ListenClose(n network.Network, addr ma.Multiaddr) {}
|