156 lines
3.3 KiB
Go
156 lines
3.3 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//go:generate mockgen -destination peer_manager_mock.go -source peer_manager.go -package resource
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package resource
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import (
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"sync"
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"time"
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pkggc "d7y.io/dragonfly/v2/pkg/gc"
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"d7y.io/dragonfly/v2/scheduler/config"
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)
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const (
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// GC peer id
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GCPeerID = "peer"
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)
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type PeerManager interface {
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// Load return peer for a key
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Load(string) (*Peer, bool)
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// Store set peer
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Store(*Peer)
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// LoadOrStore returns peer the key if present.
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// Otherwise, it stores and returns the given peer.
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// The loaded result is true if the peer was loaded, false if stored.
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LoadOrStore(*Peer) (*Peer, bool)
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// Delete deletes peer for a key
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Delete(string)
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// Try to reclaim peer
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RunGC() error
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}
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type peerManager struct {
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// Peer sync map
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*sync.Map
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// Peer time to live
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ttl time.Duration
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// Peer mutex
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mu *sync.Mutex
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}
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// New peer manager interface
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func newPeerManager(cfg *config.GCConfig, gc pkggc.GC) (PeerManager, error) {
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p := &peerManager{
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Map: &sync.Map{},
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ttl: cfg.PeerTTL,
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mu: &sync.Mutex{},
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}
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if err := gc.Add(pkggc.Task{
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ID: GCPeerID,
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Interval: cfg.PeerGCInterval,
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Timeout: cfg.PeerGCInterval,
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Runner: p,
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}); err != nil {
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return nil, err
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}
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return p, nil
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}
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func (p *peerManager) Load(key string) (*Peer, bool) {
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rawPeer, ok := p.Map.Load(key)
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if !ok {
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return nil, false
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}
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return rawPeer.(*Peer), ok
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}
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func (p *peerManager) Store(peer *Peer) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.Map.Store(peer.ID, peer)
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peer.Host.LoadOrStorePeer(peer)
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peer.Task.LoadOrStorePeer(peer)
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}
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func (p *peerManager) LoadOrStore(peer *Peer) (*Peer, bool) {
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p.mu.Lock()
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defer p.mu.Unlock()
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rawPeer, loaded := p.Map.LoadOrStore(peer.ID, peer)
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if !loaded {
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peer.Host.LoadOrStorePeer(peer)
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peer.Task.LoadOrStorePeer(peer)
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}
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return rawPeer.(*Peer), loaded
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}
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func (p *peerManager) Delete(key string) {
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p.mu.Lock()
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defer p.mu.Unlock()
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if peer, ok := p.Load(key); ok {
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p.Map.Delete(key)
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peer.Host.DeletePeer(key)
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peer.Task.DeletePeer(key)
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}
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}
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func (p *peerManager) RunGC() error {
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p.Map.Range(func(_, value interface{}) bool {
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peer := value.(*Peer)
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elapsed := time.Since(peer.UpdateAt.Load())
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if elapsed > p.ttl && peer.ChildCount.Load() == 0 {
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// If the status is PeerStateLeave,
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// clear peer information
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if peer.FSM.Is(PeerStateLeave) {
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peer.DeleteParent()
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p.Delete(peer.ID)
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peer.Log.Info("peer has been reclaimed")
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return true
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}
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// If the peer is not leave,
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// first change the state to PeerEventLeave
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if err := peer.FSM.Event(PeerEventLeave); err != nil {
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peer.Log.Errorf("peer fsm event failed: %v", err)
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}
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peer.Log.Info("gc causes the peer to leave")
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return true
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}
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return true
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})
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return nil
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}
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