11170835610

Committed 03 Oct 2024 10:41PM UTC coverage: 49.188% (-9.6%) from 58.738%

Build # 11170835610

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web-flow

Commit Message

Merge pull request #9154 from ziggie1984/master

multi: bump btcd version.

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/chanfitness/chaneventstore.go

// Package chanfitness monitors the behaviour of channels to provide insight
// into the health and performance of a channel. This is achieved by maintaining
// an event store which tracks events for each channel.
//
// Lifespan: the period that the channel has been known to the scoring system.
// Note that lifespan may not equal the channel's full lifetime because data is
// not currently persisted.
//
// Uptime: the total time within a given period that the channel's remote peer
// has been online.
package chanfitness

import (
        "errors"
        "fmt"
        "sync"
        "sync/atomic"
        "time"

        "github.com/btcsuite/btcd/wire"
        "github.com/lightningnetwork/lnd/channeldb"
        "github.com/lightningnetwork/lnd/channelnotifier"
        "github.com/lightningnetwork/lnd/clock"
        "github.com/lightningnetwork/lnd/peernotifier"
        "github.com/lightningnetwork/lnd/routing/route"
        "github.com/lightningnetwork/lnd/subscribe"
        "github.com/lightningnetwork/lnd/ticker"
)

const (
        // FlapCountFlushRate determines how often we write peer total flap
        // count to disk.
        FlapCountFlushRate = time.Hour
)

var (
        // errShuttingDown is returned when the store cannot respond to a query
        // because it has received the shutdown signal.
        errShuttingDown = errors.New("channel event store shutting down")

        // ErrChannelNotFound is returned when a query is made for a channel
        // that the event store does not have knowledge of.
        ErrChannelNotFound = errors.New("channel not found in event store")

        // ErrPeerNotFound is returned when a query is made for a channel
        // that has a peer that the event store is not currently tracking.
        ErrPeerNotFound = errors.New("peer not found in event store")
)

// ChannelEventStore maintains a set of event logs for the node's channels to
// provide insight into the performance and health of channels.
type ChannelEventStore struct {
        started atomic.Bool
        stopped atomic.Bool

        cfg *Config

        // peers tracks all of our currently monitored peers and their channels.
        peers map[route.Vertex]peerMonitor

        // chanInfoRequests serves requests for information about our channel.
        chanInfoRequests chan channelInfoRequest

        // peerRequests serves requests for information about a peer.
        peerRequests chan peerRequest

        quit chan struct{}

        wg sync.WaitGroup
}

// Config provides the event store with functions required to monitor channel
// activity. All elements of the config must be non-nil for the event store to
// operate.
type Config struct {
        // SubscribeChannelEvents provides a subscription client which provides
        // a stream of channel events.
        SubscribeChannelEvents func() (subscribe.Subscription, error)

        // SubscribePeerEvents provides a subscription client which provides a
        // stream of peer online/offline events.
        SubscribePeerEvents func() (subscribe.Subscription, error)

        // GetOpenChannels provides a list of existing open channels which is
        // used to populate the ChannelEventStore with a set of channels on
        // startup.
        GetOpenChannels func() ([]*channeldb.OpenChannel, error)

        // Clock is the time source that the subsystem uses, provided here
        // for ease of testing.
        Clock clock.Clock

        // WriteFlapCount records the flap count for a set of peers on disk.
        WriteFlapCount func(map[route.Vertex]*channeldb.FlapCount) error

        // ReadFlapCount gets the flap count for a peer on disk.
        ReadFlapCount func(route.Vertex) (*channeldb.FlapCount, error)

        // FlapCountTicker is a ticker which controls how often we flush our
        // peer's flap count to disk.
        FlapCountTicker ticker.Ticker
}

// peerFlapCountMap is the map used to map peers to flap counts, declared here
// to allow shorter function signatures.
type peerFlapCountMap map[route.Vertex]*channeldb.FlapCount

type channelInfoRequest struct {
        peer         route.Vertex
        channelPoint wire.OutPoint
        responseChan chan channelInfoResponse
}

type channelInfoResponse struct {
        info *ChannelInfo
        err  error
}

type peerRequest struct {
        peer         route.Vertex
        responseChan chan peerResponse
}

type peerResponse struct {
        flapCount int
        ts        *time.Time
        err       error
}

// NewChannelEventStore initializes an event store with the config provided.
// Note that this function does not start the main event loop, Start() must be
// called.
func NewChannelEventStore(config *Config) *ChannelEventStore {
        store := &ChannelEventStore{
                cfg:              config,
                peers:            make(map[route.Vertex]peerMonitor),
                chanInfoRequests: make(chan channelInfoRequest),
                peerRequests:     make(chan peerRequest),
                quit:             make(chan struct{}),
        }

        return store
}

// Start adds all existing open channels to the event store and starts the main
// loop which records channel and peer events, and serves requests for
// information from the store. If this function fails, it cancels its existing
// subscriptions and returns an error.
func (c *ChannelEventStore) Start() error {
        log.Info("ChannelEventStore starting...")

        if c.started.Swap(true) {
                return fmt.Errorf("ChannelEventStore started more than once")
        }

        // Create a subscription to channel events.
        channelClient, err := c.cfg.SubscribeChannelEvents()
        if err != nil {
                return err
        }

        // Create a subscription to peer events. If an error occurs, cancel the
        // existing subscription to channel events and return.
        peerClient, err := c.cfg.SubscribePeerEvents()
        if err != nil {
                channelClient.Cancel()
                return err
        }

        // cancel should be called to cancel all subscriptions if an error
        // occurs.
        cancel := func() {
                channelClient.Cancel()
                peerClient.Cancel()
        }

        // Add the existing set of channels to the event store. This is required
        // because channel events will not be triggered for channels that exist
        // at startup time.
        channels, err := c.cfg.GetOpenChannels()
        if err != nil {
                cancel()
                return err
        }

        log.Infof("Adding %v channels to event store", len(channels))

        for _, ch := range channels {
                peerKey, err := route.NewVertexFromBytes(
                        ch.IdentityPub.SerializeCompressed(),
                )
                if err != nil {
                        cancel()
                        return err
                }

                // Add existing channels to the channel store with an initial
                // peer online or offline event.
                c.addChannel(ch.FundingOutpoint, peerKey)
        }

        // Start a goroutine that consumes events from all subscriptions.
        c.wg.Add(1)
        go c.consume(&subscriptions{
                channelUpdates: channelClient.Updates(),
                peerUpdates:    peerClient.Updates(),
                cancel:         cancel,
        })

        log.Debug("ChannelEventStore started")

        return nil
}

// Stop terminates all goroutines started by the event store.
func (c *ChannelEventStore) Stop() error {
        log.Info("ChannelEventStore shutting down...")

        if c.stopped.Swap(true) {
                return fmt.Errorf("ChannelEventStore stopped more than once")
        }

        // Stop the consume goroutine.
        close(c.quit)
        c.wg.Wait()

        // Stop the ticker after the goroutine reading from it has exited, to
        // avoid a race.
        var err error
        if c.cfg.FlapCountTicker == nil {
                err = fmt.Errorf("ChannelEventStore FlapCountTicker not " +
                        "initialized")
        } else {
                c.cfg.FlapCountTicker.Stop()
        }

        log.Debugf("ChannelEventStore shutdown complete")

        return err
}

// addChannel checks whether we are already tracking a channel's peer, creates a
// new peer log to track it if we are not yet monitoring it, and adds the
// channel.
func (c *ChannelEventStore) addChannel(channelPoint wire.OutPoint,
        peer route.Vertex) {

        peerMonitor, err := c.getPeerMonitor(peer)
        if err != nil {
                log.Error("could not create monitor: %v", err)
                return
        }

        if err := peerMonitor.addChannel(channelPoint); err != nil {
                log.Errorf("could not add channel: %v", err)
        }
}

// getPeerMonitor tries to get an existing peer monitor from our in memory list,
// and falls back to creating a new monitor if it is not currently known.
func (c *ChannelEventStore) getPeerMonitor(peer route.Vertex) (peerMonitor,
        error) {

        peerMonitor, ok := c.peers[peer]
        if ok {
                return peerMonitor, nil
        }

        var (
                flapCount int
                lastFlap  *time.Time
        )

        historicalFlap, err := c.cfg.ReadFlapCount(peer)
        switch err {
        // If we do not have any records for this peer we set a 0 flap count
        // and timestamp.
        case channeldb.ErrNoPeerBucket:

        case nil:
                flapCount = int(historicalFlap.Count)
                lastFlap = &historicalFlap.LastFlap

        // Return if we get an unexpected error.
        default:
                return nil, err
        }

        peerMonitor = newPeerLog(c.cfg.Clock, flapCount, lastFlap)
        c.peers[peer] = peerMonitor

        return peerMonitor, nil
}

// closeChannel records a closed time for a channel, and returns early is the
// channel is not known to the event store. We log warnings (rather than errors)
// when we cannot find a peer/channel because channels that we restore from a
// static channel backup do not have their open notified, so the event store
// never learns about them, but they are closed using the regular flow so we
// will try to remove them on close. At present, we cannot easily distinguish
// between these closes and others.
func (c *ChannelEventStore) closeChannel(channelPoint wire.OutPoint,
        peer route.Vertex) {

        peerMonitor, ok := c.peers[peer]
        if !ok {
                log.Warnf("peer not known to store: %v", peer)
                return
        }

        if err := peerMonitor.removeChannel(channelPoint); err != nil {
                log.Warnf("could not remove channel: %v", err)
        }
}

// peerEvent creates a peer monitor for a peer if we do not currently have
// one, and adds an online event to it.
func (c *ChannelEventStore) peerEvent(peer route.Vertex, online bool) {
        peerMonitor, err := c.getPeerMonitor(peer)
        if err != nil {
                log.Error("could not create monitor: %v", err)
                return
        }

        peerMonitor.onlineEvent(online)
}

// subscriptions abstracts away from subscription clients to allow for mocking.
type subscriptions struct {
        channelUpdates <-chan interface{}
        peerUpdates    <-chan interface{}
        cancel         func()
}

// consume is the event store's main loop. It consumes subscriptions to update
// the event store with channel and peer events, and serves requests for channel
// uptime and lifespan.
func (c *ChannelEventStore) consume(subscriptions *subscriptions) {
        // Start our flap count ticker.
        c.cfg.FlapCountTicker.Resume()

        // On exit, we will cancel our subscriptions and write our most recent
        // flap counts to disk. This ensures that we have consistent data in
        // the case of a graceful shutdown. If we do not shutdown gracefully,
        // our worst case is data from our last flap count tick (1H).
        defer func() {
                subscriptions.cancel()

                if err := c.recordFlapCount(); err != nil {
                        log.Errorf("error recording flap on shutdown: %v", err)
                }

                c.wg.Done()
        }()

        // Consume events until the channel is closed.
        for {
                select {
                // Process channel opened and closed events.
                case e := <-subscriptions.channelUpdates:
                        switch event := e.(type) {
                        // A new channel has been opened, we must add the
                        // channel to the store and record a channel open event.
                        case channelnotifier.OpenChannelEvent:
                                compressed := event.Channel.IdentityPub.SerializeCompressed()
                                peerKey, err := route.NewVertexFromBytes(
                                        compressed,
                                )
                                if err != nil {
                                        log.Errorf("Could not get vertex "+
                                                "from: %v", compressed)
                                }

                                c.addChannel(
                                        event.Channel.FundingOutpoint, peerKey,
                                )

                        // A channel has been closed, we must remove the channel
                        // from the store and record a channel closed event.
                        case channelnotifier.ClosedChannelEvent:
                                compressed := event.CloseSummary.RemotePub.SerializeCompressed()
                                peerKey, err := route.NewVertexFromBytes(
                                        compressed,
                                )
                                if err != nil {
                                        log.Errorf("Could not get vertex "+
                                                "from: %v", compressed)
                                        continue
                                }

                                c.closeChannel(
                                        event.CloseSummary.ChanPoint, peerKey,
                                )
                        }

                // Process peer online and offline events.
                case e := <-subscriptions.peerUpdates:
                        switch event := e.(type) {
                        // We have reestablished a connection with our peer,
                        // and should record an online event for any channels
                        // with that peer.
                        case peernotifier.PeerOnlineEvent:
                                c.peerEvent(event.PubKey, true)

                        // We have lost a connection with our peer, and should
                        // record an offline event for any channels with that
                        // peer.
                        case peernotifier.PeerOfflineEvent:
                                c.peerEvent(event.PubKey, false)
                        }

                // Serve all requests for channel lifetime.
                case req := <-c.chanInfoRequests:
                        var resp channelInfoResponse

                        resp.info, resp.err = c.getChanInfo(req)
                        req.responseChan <- resp

                // Serve all requests for information about our peer.
                case req := <-c.peerRequests:
                        var resp peerResponse

                        resp.flapCount, resp.ts, resp.err = c.flapCount(
                                req.peer,
                        )
                        req.responseChan <- resp

                case <-c.cfg.FlapCountTicker.Ticks():
                        if err := c.recordFlapCount(); err != nil {
                                log.Errorf("could not record flap "+
                                        "count: %v", err)
                        }

                // Exit if the store receives the signal to shutdown.
                case <-c.quit:
                        return
                }
        }
}

// ChannelInfo provides the set of information that the event store has recorded
// for a channel.
type ChannelInfo struct {
        // Lifetime is the total amount of time we have monitored the channel
        // for.
        Lifetime time.Duration

        // Uptime is the total amount of time that the channel peer has been
        // observed as online during the monitored lifespan.
        Uptime time.Duration
}

// GetChanInfo gets all the information we have on a channel in the event store.
func (c *ChannelEventStore) GetChanInfo(channelPoint wire.OutPoint,
        peer route.Vertex) (*ChannelInfo, error) {

        request := channelInfoRequest{
                peer:         peer,
                channelPoint: channelPoint,
                responseChan: make(chan channelInfoResponse),
        }

        // Send a request for the channel's information to the main event loop,
        // or return early with an error if the store has already received a
        // shutdown signal.
        select {
        case c.chanInfoRequests <- request:
        case <-c.quit:
                return nil, errShuttingDown
        }

        // Return the response we receive on the response channel or exit early
        // if the store is instructed to exit.
        select {
        case resp := <-request.responseChan:
                return resp.info, resp.err

        case <-c.quit:
                return nil, errShuttingDown
        }
}

// getChanInfo collects channel information for a channel. It gets uptime over
// the full lifetime of the channel.
func (c *ChannelEventStore) getChanInfo(req channelInfoRequest) (*ChannelInfo,
        error) {

        peerMonitor, ok := c.peers[req.peer]
        if !ok {
                return nil, ErrPeerNotFound
        }

        lifetime, uptime, err := peerMonitor.channelUptime(req.channelPoint)
        if err != nil {
                return nil, err
        }

        return &ChannelInfo{
                Lifetime: lifetime,
                Uptime:   uptime,
        }, nil
}

// FlapCount returns the flap count we have for a peer and the timestamp of its
// last flap. If we do not have any flaps recorded for the peer, the last flap
// timestamp will be nil.
func (c *ChannelEventStore) FlapCount(peer route.Vertex) (int, *time.Time,
        error) {

        request := peerRequest{
                peer:         peer,
                responseChan: make(chan peerResponse),
        }

        // Send a request for the peer's information to the main event loop,
        // or return early with an error if the store has already received a
        // shutdown signal.
        select {
        case c.peerRequests <- request:
        case <-c.quit:
                return 0, nil, errShuttingDown
        }

        // Return the response we receive on the response channel or exit early
        // if the store is instructed to exit.
        select {
        case resp := <-request.responseChan:
                return resp.flapCount, resp.ts, resp.err

        case <-c.quit:
                return 0, nil, errShuttingDown
        }
}

// flapCount gets our peer flap count and last flap timestamp from our in memory
// record of a peer, falling back to on disk if we are not currently tracking
// the peer. If we have no flap count recorded for the peer, a nil last flap
// time will be returned.
func (c *ChannelEventStore) flapCount(peer route.Vertex) (int, *time.Time,
        error) {

        // First check whether we are tracking this peer in memory, because this
        // record will have the most accurate flap count. We do not fail if we
        // can't find the peer in memory, because we may have previously
        // recorded its flap count on disk.
        peerMonitor, ok := c.peers[peer]
        if ok {
                count, ts := peerMonitor.getFlapCount()
                return count, ts, nil
        }

        // Try to get our flap count from the database. If this value is not
        // recorded, we return a nil last flap time to indicate that we have no
        // record of the peer's flap count.
        flapCount, err := c.cfg.ReadFlapCount(peer)
        switch err {
        case channeldb.ErrNoPeerBucket:
                return 0, nil, nil

        case nil:
                return int(flapCount.Count), &flapCount.LastFlap, nil

        default:
                return 0, nil, err
        }
}

// recordFlapCount will record our flap count for each peer that we are
// currently tracking, skipping peers that have a 0 flap count.
func (c *ChannelEventStore) recordFlapCount() error {
        updates := make(peerFlapCountMap)

        for peer, monitor := range c.peers {
                flapCount, lastFlap := monitor.getFlapCount()
                if lastFlap == nil {
                        continue
                }

                updates[peer] = &channeldb.FlapCount{
                        Count:    uint32(flapCount),
                        LastFlap: *lastFlap,
                }
        }

        log.Debugf("recording flap count for: %v peers", len(updates))

        return c.cfg.WriteFlapCount(updates)
}

1	// Package chanfitness monitors the behaviour of channels to provide insight
2	// into the health and performance of a channel. This is achieved by maintaining
3	// an event store which tracks events for each channel.
4	//
5	// Lifespan: the period that the channel has been known to the scoring system.
6	// Note that lifespan may not equal the channel's full lifetime because data is
7	// not currently persisted.
8	//
9	// Uptime: the total time within a given period that the channel's remote peer
10	// has been online.
11	package chanfitness
12
13	import (
14	"errors"
15	"fmt"
16	"sync"
17	"sync/atomic"
18	"time"
19
20	"github.com/btcsuite/btcd/wire"
21	"github.com/lightningnetwork/lnd/channeldb"
22	"github.com/lightningnetwork/lnd/channelnotifier"
23	"github.com/lightningnetwork/lnd/clock"
24	"github.com/lightningnetwork/lnd/peernotifier"
25	"github.com/lightningnetwork/lnd/routing/route"
26	"github.com/lightningnetwork/lnd/subscribe"
27	"github.com/lightningnetwork/lnd/ticker"
28	)
29
30	const (
31	// FlapCountFlushRate determines how often we write peer total flap
32	// count to disk.
33	FlapCountFlushRate = time.Hour
34	)
35
36	var (
37	// errShuttingDown is returned when the store cannot respond to a query
38	// because it has received the shutdown signal.
39	errShuttingDown = errors.New("channel event store shutting down")
40
41	// ErrChannelNotFound is returned when a query is made for a channel
42	// that the event store does not have knowledge of.
43	ErrChannelNotFound = errors.New("channel not found in event store")
44
45	// ErrPeerNotFound is returned when a query is made for a channel
46	// that has a peer that the event store is not currently tracking.
47	ErrPeerNotFound = errors.New("peer not found in event store")
48	)
49
50	// ChannelEventStore maintains a set of event logs for the node's channels to
51	// provide insight into the performance and health of channels.
52	type ChannelEventStore struct {
53	started atomic.Bool
54	stopped atomic.Bool
55
56	cfg *Config
57
58	// peers tracks all of our currently monitored peers and their channels.
59	peers map[route.Vertex]peerMonitor
60
61	// chanInfoRequests serves requests for information about our channel.
62	chanInfoRequests chan channelInfoRequest
63
64	// peerRequests serves requests for information about a peer.
65	peerRequests chan peerRequest
66
67	quit chan struct{}
68
69	wg sync.WaitGroup
70	}
71
72	// Config provides the event store with functions required to monitor channel
73	// activity. All elements of the config must be non-nil for the event store to
74	// operate.
75	type Config struct {
76	// SubscribeChannelEvents provides a subscription client which provides
77	// a stream of channel events.
78	SubscribeChannelEvents func() (subscribe.Subscription, error)
79
80	// SubscribePeerEvents provides a subscription client which provides a
81	// stream of peer online/offline events.
82	SubscribePeerEvents func() (subscribe.Subscription, error)
83
84	// GetOpenChannels provides a list of existing open channels which is
85	// used to populate the ChannelEventStore with a set of channels on
86	// startup.
87	GetOpenChannels func() ([]*channeldb.OpenChannel, error)
88
89	// Clock is the time source that the subsystem uses, provided here
90	// for ease of testing.
91	Clock clock.Clock
92
93	// WriteFlapCount records the flap count for a set of peers on disk.
94	WriteFlapCount func(map[route.Vertex]*channeldb.FlapCount) error
95
96	// ReadFlapCount gets the flap count for a peer on disk.
97	ReadFlapCount func(route.Vertex) (*channeldb.FlapCount, error)
98
99	// FlapCountTicker is a ticker which controls how often we flush our
100	// peer's flap count to disk.
101	FlapCountTicker ticker.Ticker
102	}
103
104	// peerFlapCountMap is the map used to map peers to flap counts, declared here
105	// to allow shorter function signatures.
106	type peerFlapCountMap map[route.Vertex]*channeldb.FlapCount
107
108	type channelInfoRequest struct {
109	peer route.Vertex
110	channelPoint wire.OutPoint
111	responseChan chan channelInfoResponse
112	}
113
114	type channelInfoResponse struct {
115	info *ChannelInfo
116	err error
117	}
118
119	type peerRequest struct {
120	peer route.Vertex
121	responseChan chan peerResponse
122	}
123
124	type peerResponse struct {
125	flapCount int
126	ts *time.Time
127	err error
128	}
129
130	// NewChannelEventStore initializes an event store with the config provided.
131	// Note that this function does not start the main event loop, Start() must be
132	// called.
133	func NewChannelEventStore(config Config) ChannelEventStore {	2✔
134	store := &ChannelEventStore{	2✔
135	cfg: config,	2✔
136	peers: make(map[route.Vertex]peerMonitor),	2✔
137	chanInfoRequests: make(chan channelInfoRequest),	2✔
138	peerRequests: make(chan peerRequest),	2✔
139	quit: make(chan struct{}),	2✔
140	}	2✔
141		2✔
142	return store	2✔
143	}	2✔
144
145	// Start adds all existing open channels to the event store and starts the main
146	// loop which records channel and peer events, and serves requests for
147	// information from the store. If this function fails, it cancels its existing
148	// subscriptions and returns an error.
149	func (c *ChannelEventStore) Start() error {	2✔
150	log.Info("ChannelEventStore starting...")	2✔
151		2✔
152	if c.started.Swap(true) {	2✔
153	return fmt.Errorf("ChannelEventStore started more than once")	×
154	}	×
155
156	// Create a subscription to channel events.
157	channelClient, err := c.cfg.SubscribeChannelEvents()	2✔
158	if err != nil {	2✔
UNCOV 159	return err	×
UNCOV 160	}	×
161
162	// Create a subscription to peer events. If an error occurs, cancel the
163	// existing subscription to channel events and return.
164	peerClient, err := c.cfg.SubscribePeerEvents()	2✔
165	if err != nil {	2✔
UNCOV 166	channelClient.Cancel()	×
UNCOV 167	return err	×
UNCOV 168	}	×
169
170	// cancel should be called to cancel all subscriptions if an error
171	// occurs.
172	cancel := func() {	4✔
173	channelClient.Cancel()	2✔
174	peerClient.Cancel()	2✔
175	}	2✔
176
177	// Add the existing set of channels to the event store. This is required
178	// because channel events will not be triggered for channels that exist
179	// at startup time.
180	channels, err := c.cfg.GetOpenChannels()	2✔
181	if err != nil {	2✔
UNCOV 182	cancel()	×
UNCOV 183	return err	×
UNCOV 184	}	×
185
186	log.Infof("Adding %v channels to event store", len(channels))	2✔
187		2✔
188	for _, ch := range channels {	4✔
189	peerKey, err := route.NewVertexFromBytes(	2✔
190	ch.IdentityPub.SerializeCompressed(),	2✔
191	)	2✔
192	if err != nil {	2✔
193	cancel()	×
194	return err	×
195	}	×
196
197	// Add existing channels to the channel store with an initial
198	// peer online or offline event.
199	c.addChannel(ch.FundingOutpoint, peerKey)	2✔
200	}
201
202	// Start a goroutine that consumes events from all subscriptions.
203	c.wg.Add(1)	2✔
204	go c.consume(&subscriptions{	2✔
205	channelUpdates: channelClient.Updates(),	2✔
206	peerUpdates: peerClient.Updates(),	2✔
207	cancel: cancel,	2✔
208	})	2✔
209		2✔
210	log.Debug("ChannelEventStore started")	2✔
211		2✔
212	return nil	2✔
213	}
214
215	// Stop terminates all goroutines started by the event store.
216	func (c *ChannelEventStore) Stop() error {	2✔
217	log.Info("ChannelEventStore shutting down...")	2✔
218		2✔
219	if c.stopped.Swap(true) {	2✔
220	return fmt.Errorf("ChannelEventStore stopped more than once")	×
221	}	×
222
223	// Stop the consume goroutine.
224	close(c.quit)	2✔
225	c.wg.Wait()	2✔
226		2✔
227	// Stop the ticker after the goroutine reading from it has exited, to	2✔
228	// avoid a race.	2✔
229	var err error	2✔
230	if c.cfg.FlapCountTicker == nil {	2✔
231	err = fmt.Errorf("ChannelEventStore FlapCountTicker not " +	×
232	"initialized")	×
233	} else {	2✔
234	c.cfg.FlapCountTicker.Stop()	2✔
235	}	2✔
236
237	log.Debugf("ChannelEventStore shutdown complete")	2✔
238		2✔
239	return err	2✔
240	}
241
242	// addChannel checks whether we are already tracking a channel's peer, creates a
243	// new peer log to track it if we are not yet monitoring it, and adds the
244	// channel.
245	func (c *ChannelEventStore) addChannel(channelPoint wire.OutPoint,
246	peer route.Vertex) {	2✔
247		2✔
248	peerMonitor, err := c.getPeerMonitor(peer)	2✔
249	if err != nil {	2✔
250	log.Error("could not create monitor: %v", err)	×
251	return	×
252	}	×
253
254	if err := peerMonitor.addChannel(channelPoint); err != nil {	2✔
UNCOV 255	log.Errorf("could not add channel: %v", err)	×
UNCOV 256	}	×
257	}
258
259	// getPeerMonitor tries to get an existing peer monitor from our in memory list,
260	// and falls back to creating a new monitor if it is not currently known.
261	func (c *ChannelEventStore) getPeerMonitor(peer route.Vertex) (peerMonitor,
262	error) {	2✔
263		2✔
264	peerMonitor, ok := c.peers[peer]	2✔
265	if ok {	4✔
266	return peerMonitor, nil	2✔
267	}	2✔
268
269	var (	2✔
270	flapCount int	2✔
271	lastFlap *time.Time	2✔
272	)	2✔
273		2✔
274	historicalFlap, err := c.cfg.ReadFlapCount(peer)	2✔
275	switch err {	2✔
276	// If we do not have any records for this peer we set a 0 flap count
277	// and timestamp.
278	case channeldb.ErrNoPeerBucket:	2✔
279
280	case nil:	2✔
281	flapCount = int(historicalFlap.Count)	2✔
282	lastFlap = &historicalFlap.LastFlap	2✔
283
284	// Return if we get an unexpected error.
285	default:	×
286	return nil, err	×
287	}
288
289	peerMonitor = newPeerLog(c.cfg.Clock, flapCount, lastFlap)	2✔
290	c.peers[peer] = peerMonitor	2✔
291		2✔
292	return peerMonitor, nil	2✔
293	}
294
295	// closeChannel records a closed time for a channel, and returns early is the
296	// channel is not known to the event store. We log warnings (rather than errors)
297	// when we cannot find a peer/channel because channels that we restore from a
298	// static channel backup do not have their open notified, so the event store
299	// never learns about them, but they are closed using the regular flow so we
300	// will try to remove them on close. At present, we cannot easily distinguish
301	// between these closes and others.
302	func (c *ChannelEventStore) closeChannel(channelPoint wire.OutPoint,
303	peer route.Vertex) {	2✔
304		2✔
305	peerMonitor, ok := c.peers[peer]	2✔
306	if !ok {	4✔
307	log.Warnf("peer not known to store: %v", peer)	2✔
308	return	2✔
309	}	2✔
310
311	if err := peerMonitor.removeChannel(channelPoint); err != nil {	4✔
312	log.Warnf("could not remove channel: %v", err)	2✔
313	}	2✔
314	}
315
316	// peerEvent creates a peer monitor for a peer if we do not currently have
317	// one, and adds an online event to it.
318	func (c *ChannelEventStore) peerEvent(peer route.Vertex, online bool) {	2✔
319	peerMonitor, err := c.getPeerMonitor(peer)	2✔
320	if err != nil {	2✔
321	log.Error("could not create monitor: %v", err)	×
322	return	×
323	}	×
324
325	peerMonitor.onlineEvent(online)	2✔
326	}
327
328	// subscriptions abstracts away from subscription clients to allow for mocking.
329	type subscriptions struct {
330	channelUpdates <-chan interface{}
331	peerUpdates <-chan interface{}
332	cancel func()
333	}
334
335	// consume is the event store's main loop. It consumes subscriptions to update
336	// the event store with channel and peer events, and serves requests for channel
337	// uptime and lifespan.
338	func (c ChannelEventStore) consume(subscriptions subscriptions) {	2✔
339	// Start our flap count ticker.	2✔
340	c.cfg.FlapCountTicker.Resume()	2✔
341		2✔
342	// On exit, we will cancel our subscriptions and write our most recent	2✔
343	// flap counts to disk. This ensures that we have consistent data in	2✔
344	// the case of a graceful shutdown. If we do not shutdown gracefully,	2✔
345	// our worst case is data from our last flap count tick (1H).	2✔
346	defer func() {	4✔
347	subscriptions.cancel()	2✔
348		2✔
349	if err := c.recordFlapCount(); err != nil {	2✔
350	log.Errorf("error recording flap on shutdown: %v", err)	×
351	}	×
352
353	c.wg.Done()	2✔
354	}()
355
356	// Consume events until the channel is closed.
357	for {	4✔
358	select {	2✔
359	// Process channel opened and closed events.
360	case e := <-subscriptions.channelUpdates:	2✔
361	switch event := e.(type) {	2✔
362	// A new channel has been opened, we must add the
363	// channel to the store and record a channel open event.
364	case channelnotifier.OpenChannelEvent:	2✔
365	compressed := event.Channel.IdentityPub.SerializeCompressed()	2✔
366	peerKey, err := route.NewVertexFromBytes(	2✔
367	compressed,	2✔
368	)	2✔
369	if err != nil {	2✔
370	log.Errorf("Could not get vertex "+	×
371	"from: %v", compressed)	×
372	}	×
373
374	c.addChannel(	2✔
375	event.Channel.FundingOutpoint, peerKey,	2✔
376	)	2✔
377
378	// A channel has been closed, we must remove the channel
379	// from the store and record a channel closed event.
380	case channelnotifier.ClosedChannelEvent:	2✔
381	compressed := event.CloseSummary.RemotePub.SerializeCompressed()	2✔
382	peerKey, err := route.NewVertexFromBytes(	2✔
383	compressed,	2✔
384	)	2✔
385	if err != nil {	2✔
386	log.Errorf("Could not get vertex "+	×
387	"from: %v", compressed)	×
388	continue	×
389	}
390
391	c.closeChannel(	2✔
392	event.CloseSummary.ChanPoint, peerKey,	2✔
393	)	2✔
394	}
395
396	// Process peer online and offline events.
397	case e := <-subscriptions.peerUpdates:	2✔
398	switch event := e.(type) {	2✔
399	// We have reestablished a connection with our peer,
400	// and should record an online event for any channels
401	// with that peer.
402	case peernotifier.PeerOnlineEvent:	2✔
403	c.peerEvent(event.PubKey, true)	2✔
404
405	// We have lost a connection with our peer, and should
406	// record an offline event for any channels with that
407	// peer.
408	case peernotifier.PeerOfflineEvent:	2✔
409	c.peerEvent(event.PubKey, false)	2✔
410	}
411
412	// Serve all requests for channel lifetime.
413	case req := <-c.chanInfoRequests:	2✔
414	var resp channelInfoResponse	2✔
415		2✔
416	resp.info, resp.err = c.getChanInfo(req)	2✔
417	req.responseChan <- resp	2✔
418
419	// Serve all requests for information about our peer.
420	case req := <-c.peerRequests:	2✔
421	var resp peerResponse	2✔
422		2✔
423	resp.flapCount, resp.ts, resp.err = c.flapCount(	2✔
424	req.peer,	2✔
425	)	2✔
426	req.responseChan <- resp	2✔
427
UNCOV 428	case <-c.cfg.FlapCountTicker.Ticks():	×
UNCOV 429	if err := c.recordFlapCount(); err != nil {	×
430	log.Errorf("could not record flap "+	×
431	"count: %v", err)	×
432	}	×
433
434	// Exit if the store receives the signal to shutdown.
435	case <-c.quit:	2✔
436	return	2✔
437	}
438	}
439	}
440
441	// ChannelInfo provides the set of information that the event store has recorded
442	// for a channel.
443	type ChannelInfo struct {
444	// Lifetime is the total amount of time we have monitored the channel
445	// for.
446	Lifetime time.Duration
447
448	// Uptime is the total amount of time that the channel peer has been
449	// observed as online during the monitored lifespan.
450	Uptime time.Duration
451	}
452
453	// GetChanInfo gets all the information we have on a channel in the event store.
454	func (c *ChannelEventStore) GetChanInfo(channelPoint wire.OutPoint,
455	peer route.Vertex) (*ChannelInfo, error) {	2✔
456		2✔
457	request := channelInfoRequest{	2✔
458	peer: peer,	2✔
459	channelPoint: channelPoint,	2✔
460	responseChan: make(chan channelInfoResponse),	2✔
461	}	2✔
462		2✔
463	// Send a request for the channel's information to the main event loop,	2✔
464	// or return early with an error if the store has already received a	2✔
465	// shutdown signal.	2✔
466	select {	2✔
467	case c.chanInfoRequests <- request:	2✔
468	case <-c.quit:	×
469	return nil, errShuttingDown	×
470	}
471
472	// Return the response we receive on the response channel or exit early
473	// if the store is instructed to exit.
474	select {	2✔
475	case resp := <-request.responseChan:	2✔
476	return resp.info, resp.err	2✔
477
478	case <-c.quit:	×
479	return nil, errShuttingDown	×
480	}
481	}
482
483	// getChanInfo collects channel information for a channel. It gets uptime over
484	// the full lifetime of the channel.
485	func (c ChannelEventStore) getChanInfo(req channelInfoRequest) (ChannelInfo,
486	error) {	2✔
487		2✔
488	peerMonitor, ok := c.peers[req.peer]	2✔
489	if !ok {	2✔
490	return nil, ErrPeerNotFound	×
491	}	×
492
493	lifetime, uptime, err := peerMonitor.channelUptime(req.channelPoint)	2✔
494	if err != nil {	4✔
495	return nil, err	2✔
496	}	2✔
497
498	return &ChannelInfo{	2✔
499	Lifetime: lifetime,	2✔
500	Uptime: uptime,	2✔
501	}, nil	2✔
502	}
503
504	// FlapCount returns the flap count we have for a peer and the timestamp of its
505	// last flap. If we do not have any flaps recorded for the peer, the last flap
506	// timestamp will be nil.
507	func (c ChannelEventStore) FlapCount(peer route.Vertex) (int, time.Time,
508	error) {	2✔
509		2✔
510	request := peerRequest{	2✔
511	peer: peer,	2✔
512	responseChan: make(chan peerResponse),	2✔
513	}	2✔
514		2✔
515	// Send a request for the peer's information to the main event loop,	2✔
516	// or return early with an error if the store has already received a	2✔
517	// shutdown signal.	2✔
518	select {	2✔
519	case c.peerRequests <- request:	2✔
520	case <-c.quit:	×
521	return 0, nil, errShuttingDown	×
522	}
523
524	// Return the response we receive on the response channel or exit early
525	// if the store is instructed to exit.
526	select {	2✔
527	case resp := <-request.responseChan:	2✔
528	return resp.flapCount, resp.ts, resp.err	2✔
529
530	case <-c.quit:	×
531	return 0, nil, errShuttingDown	×
532	}
533	}
534
535	// flapCount gets our peer flap count and last flap timestamp from our in memory
536	// record of a peer, falling back to on disk if we are not currently tracking
537	// the peer. If we have no flap count recorded for the peer, a nil last flap
538	// time will be returned.
539	func (c ChannelEventStore) flapCount(peer route.Vertex) (int, time.Time,
540	error) {	2✔
541		2✔
542	// First check whether we are tracking this peer in memory, because this	2✔
543	// record will have the most accurate flap count. We do not fail if we	2✔
544	// can't find the peer in memory, because we may have previously	2✔
545	// recorded its flap count on disk.	2✔
546	peerMonitor, ok := c.peers[peer]	2✔
547	if ok {	4✔
548	count, ts := peerMonitor.getFlapCount()	2✔
549	return count, ts, nil	2✔
550	}	2✔
551
552	// Try to get our flap count from the database. If this value is not
553	// recorded, we return a nil last flap time to indicate that we have no
554	// record of the peer's flap count.
UNCOV 555	flapCount, err := c.cfg.ReadFlapCount(peer)	×
UNCOV 556	switch err {	×
UNCOV 557	case channeldb.ErrNoPeerBucket:	×
UNCOV 558	return 0, nil, nil	×
559
UNCOV 560	case nil:	×
UNCOV 561	return int(flapCount.Count), &flapCount.LastFlap, nil	×
562
563	default:	×
564	return 0, nil, err	×
565	}
566	}
567
568	// recordFlapCount will record our flap count for each peer that we are
569	// currently tracking, skipping peers that have a 0 flap count.
570	func (c *ChannelEventStore) recordFlapCount() error {	2✔
571	updates := make(peerFlapCountMap)	2✔
572		2✔
573	for peer, monitor := range c.peers {	4✔
574	flapCount, lastFlap := monitor.getFlapCount()	2✔
575	if lastFlap == nil {	2✔
576	continue	×
577	}
578
579	updates[peer] = &channeldb.FlapCount{	2✔
580	Count: uint32(flapCount),	2✔
581	LastFlap: *lastFlap,	2✔
582	}	2✔
583	}
584
585	log.Debugf("recording flap count for: %v peers", len(updates))	2✔
586		2✔
587	return c.cfg.WriteFlapCount(updates)	2✔
588	}

lightningnetwork / lnd / 11170835610

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