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How to use Timeout method of wait Package

Best Testcontainers-go code snippet using wait.Timeout

serverpool.go

Source:serverpool.go

...31	"github.com/ethereum/go-ethereum/p2p/nodestate"32	"github.com/ethereum/go-ethereum/rlp"33)34const (35	minTimeout          = time.Millisecond * 500 // minimum request timeout suggested by the server pool36	timeoutRefresh      = time.Second * 5        // recalculate timeout if older than this37	dialCost            = 10000                  // cost of a TCP dial (used for known node selection weight calculation)38	dialWaitStep        = 1.5                    // exponential multiplier of redial wait time when no value was provided by the server39	queryCost           = 500                    // cost of a UDP pre-negotiation query40	queryWaitStep       = 1.02                   // exponential multiplier of redial wait time when no value was provided by the server41	waitThreshold       = time.Hour * 2000       // drop node if waiting time is over the threshold42	nodeWeightMul       = 1000000                // multiplier constant for node weight calculation43	nodeWeightThreshold = 100                    // minimum weight for keeping a node in the the known (valuable) set44	minRedialWait       = 10                     // minimum redial wait time in seconds45	preNegLimit         = 5                      // maximum number of simultaneous pre-negotiation queries46	maxQueryFails       = 100                    // number of consecutive UDP query failures before we print a warning47)48// serverPool provides a node iterator for dial candidates. The output is a mix of newly discovered49// nodes, a weighted random selection of known (previously valuable) nodes and trusted/paid nodes.50type serverPool struct {51	clock    mclock.Clock52	unixTime func() int6453	db       ethdb.KeyValueStore54	ns           *nodestate.NodeStateMachine55	vt           *lpc.ValueTracker56	mixer        *enode.FairMix57	mixSources   []enode.Iterator58	dialIterator enode.Iterator59	validSchemes enr.IdentityScheme60	trustedURLs  []string61	fillSet      *lpc.FillSet62	queryFails   uint3263	timeoutLock      sync.RWMutex64	timeout          time.Duration65	timeWeights      lpc.ResponseTimeWeights66	timeoutRefreshed mclock.AbsTime67}68// nodeHistory keeps track of dial costs which determine node weight together with the69// service value calculated by lpc.ValueTracker.70type nodeHistory struct {71	dialCost                       utils.ExpiredValue72	redialWaitStart, redialWaitEnd int64 // unix time (seconds)73}74type nodeHistoryEnc struct {75	DialCost                       utils.ExpiredValue76	RedialWaitStart, RedialWaitEnd uint6477}78// queryFunc sends a pre-negotiation query and blocks until a response arrives or timeout occurs.79// It returns 1 if the remote node has confirmed that connection is possible, 0 if not80// possible and -1 if no response arrived (timeout).81type queryFunc func(*enode.Node) int82var (83	serverPoolSetup    = &nodestate.Setup{Version: 1}84	sfHasValue         = serverPoolSetup.NewPersistentFlag("hasValue")85	sfQueried          = serverPoolSetup.NewFlag("queried")86	sfCanDial          = serverPoolSetup.NewFlag("canDial")87	sfDialing          = serverPoolSetup.NewFlag("dialed")88	sfWaitDialTimeout  = serverPoolSetup.NewFlag("dialTimeout")89	sfConnected        = serverPoolSetup.NewFlag("connected")90	sfRedialWait       = serverPoolSetup.NewFlag("redialWait")91	sfAlwaysConnect    = serverPoolSetup.NewFlag("alwaysConnect")92	sfDisableSelection = nodestate.MergeFlags(sfQueried, sfCanDial, sfDialing, sfConnected, sfRedialWait)93	sfiNodeHistory = serverPoolSetup.NewPersistentField("nodeHistory", reflect.TypeOf(nodeHistory{}),94		func(field interface{}) ([]byte, error) {95			if n, ok := field.(nodeHistory); ok {96				ne := nodeHistoryEnc{97					DialCost:        n.dialCost,98					RedialWaitStart: uint64(n.redialWaitStart),99					RedialWaitEnd:   uint64(n.redialWaitEnd),100				}101				enc, err := rlp.EncodeToBytes(&ne)102				return enc, err103			} else {104				return nil, errors.New("invalid field type")105			}106		},107		func(enc []byte) (interface{}, error) {108			var ne nodeHistoryEnc109			err := rlp.DecodeBytes(enc, &ne)110			n := nodeHistory{111				dialCost:        ne.DialCost,112				redialWaitStart: int64(ne.RedialWaitStart),113				redialWaitEnd:   int64(ne.RedialWaitEnd),114			}115			return n, err116		},117	)118	sfiNodeWeight     = serverPoolSetup.NewField("nodeWeight", reflect.TypeOf(uint64(0)))119	sfiConnectedStats = serverPoolSetup.NewField("connectedStats", reflect.TypeOf(lpc.ResponseTimeStats{}))120)121// newServerPool creates a new server pool122func newServerPool(db ethdb.KeyValueStore, dbKey []byte, vt *lpc.ValueTracker, discovery enode.Iterator, mixTimeout time.Duration, query queryFunc, clock mclock.Clock, trustedURLs []string) *serverPool {123	s := &serverPool{124		db:           db,125		clock:        clock,126		unixTime:     func() int64 { return time.Now().Unix() },127		validSchemes: enode.ValidSchemes,128		trustedURLs:  trustedURLs,129		vt:           vt,130		ns:           nodestate.NewNodeStateMachine(db, []byte(string(dbKey)+"ns:"), clock, serverPoolSetup),131	}132	s.recalTimeout()133	s.mixer = enode.NewFairMix(mixTimeout)134	knownSelector := lpc.NewWrsIterator(s.ns, sfHasValue, sfDisableSelection, sfiNodeWeight)135	alwaysConnect := lpc.NewQueueIterator(s.ns, sfAlwaysConnect, sfDisableSelection, true, nil)136	s.mixSources = append(s.mixSources, knownSelector)137	s.mixSources = append(s.mixSources, alwaysConnect)138	if discovery != nil {139		s.mixSources = append(s.mixSources, discovery)140	}141	iter := enode.Iterator(s.mixer)142	if query != nil {143		iter = s.addPreNegFilter(iter, query)144	}145	s.dialIterator = enode.Filter(iter, func(node *enode.Node) bool {146		s.ns.SetState(node, sfDialing, sfCanDial, 0)147		s.ns.SetState(node, sfWaitDialTimeout, nodestate.Flags{}, time.Second*10)148		return true149	})150	s.ns.SubscribeState(nodestate.MergeFlags(sfWaitDialTimeout, sfConnected), func(n *enode.Node, oldState, newState nodestate.Flags) {151		if oldState.Equals(sfWaitDialTimeout) && newState.IsEmpty() {152			// dial timeout, no connection153			s.setRedialWait(n, dialCost, dialWaitStep)154			s.ns.SetState(n, nodestate.Flags{}, sfDialing, 0)155		}156	})157	s.ns.AddLogMetrics(sfHasValue, sfDisableSelection, "selectable", nil, nil, serverSelectableGauge)158	s.ns.AddLogMetrics(sfDialing, nodestate.Flags{}, "dialed", serverDialedMeter, nil, nil)159	s.ns.AddLogMetrics(sfConnected, nodestate.Flags{}, "connected", nil, nil, serverConnectedGauge)160	return s161}162// addPreNegFilter installs a node filter mechanism that performs a pre-negotiation query.163// Nodes that are filtered out and does not appear on the output iterator are put back164// into redialWait state.165func (s *serverPool) addPreNegFilter(input enode.Iterator, query queryFunc) enode.Iterator {166	s.fillSet = lpc.NewFillSet(s.ns, input, sfQueried)167	s.ns.SubscribeState(sfQueried, func(n *enode.Node, oldState, newState nodestate.Flags) {168		if newState.Equals(sfQueried) {169			fails := atomic.LoadUint32(&s.queryFails)170			if fails == maxQueryFails {171				log.Warn("UDP pre-negotiation query does not seem to work")172			}173			if fails > maxQueryFails {174				fails = maxQueryFails175			}176			if rand.Intn(maxQueryFails*2) < int(fails) {177				// skip pre-negotiation with increasing chance, max 50%178				// this ensures that the client can operate even if UDP is not working at all179				s.ns.SetState(n, sfCanDial, nodestate.Flags{}, time.Second*10)180				// set canDial before resetting queried so that FillSet will not read more181				// candidates unnecessarily182				s.ns.SetState(n, nodestate.Flags{}, sfQueried, 0)183				return184			}185			go func() {186				q := query(n)187				if q == -1 {188					atomic.AddUint32(&s.queryFails, 1)189				} else {190					atomic.StoreUint32(&s.queryFails, 0)191				}192				if q == 1 {193					s.ns.SetState(n, sfCanDial, nodestate.Flags{}, time.Second*10)194				} else {195					s.setRedialWait(n, queryCost, queryWaitStep)196				}197				s.ns.SetState(n, nodestate.Flags{}, sfQueried, 0)198			}()199		}200	})201	return lpc.NewQueueIterator(s.ns, sfCanDial, nodestate.Flags{}, false, func(waiting bool) {202		if waiting {203			s.fillSet.SetTarget(preNegLimit)204		} else {205			s.fillSet.SetTarget(0)206		}207	})208}209// start starts the server pool. Note that NodeStateMachine should be started first.210func (s *serverPool) start() {211	s.ns.Start()212	for _, iter := range s.mixSources {213		// add sources to mixer at startup because the mixer instantly tries to read them214		// which should only happen after NodeStateMachine has been started215		s.mixer.AddSource(iter)216	}217	for _, url := range s.trustedURLs {218		if node, err := enode.Parse(s.validSchemes, url); err == nil {219			s.ns.SetState(node, sfAlwaysConnect, nodestate.Flags{}, 0)220		} else {221			log.Error("Invalid trusted server URL", "url", url, "error", err)222		}223	}224	unixTime := s.unixTime()225	s.ns.ForEach(sfHasValue, nodestate.Flags{}, func(node *enode.Node, state nodestate.Flags) {226		s.calculateWeight(node)227		if n, ok := s.ns.GetField(node, sfiNodeHistory).(nodeHistory); ok && n.redialWaitEnd > unixTime {228			wait := n.redialWaitEnd - unixTime229			lastWait := n.redialWaitEnd - n.redialWaitStart230			if wait > lastWait {231				// if the time until expiration is larger than the last suggested232				// waiting time then the system clock was probably adjusted233				wait = lastWait234			}235			s.ns.SetState(node, sfRedialWait, nodestate.Flags{}, time.Duration(wait)*time.Second)236		}237	})238}239// stop stops the server pool240func (s *serverPool) stop() {241	s.dialIterator.Close()242	if s.fillSet != nil {243		s.fillSet.Close()244	}245	s.ns.ForEach(sfConnected, nodestate.Flags{}, func(n *enode.Node, state nodestate.Flags) {246		// recalculate weight of connected nodes in order to update hasValue flag if necessary247		s.calculateWeight(n)248	})249	s.ns.Stop()250}251// registerPeer implements serverPeerSubscriber252func (s *serverPool) registerPeer(p *serverPeer) {253	s.ns.SetState(p.Node(), sfConnected, sfDialing.Or(sfWaitDialTimeout), 0)254	nvt := s.vt.Register(p.ID())255	s.ns.SetField(p.Node(), sfiConnectedStats, nvt.RtStats())256	p.setValueTracker(s.vt, nvt)257	p.updateVtParams()258}259// unregisterPeer implements serverPeerSubscriber260func (s *serverPool) unregisterPeer(p *serverPeer) {261	s.setRedialWait(p.Node(), dialCost, dialWaitStep)262	s.ns.SetState(p.Node(), nodestate.Flags{}, sfConnected, 0)263	s.ns.SetField(p.Node(), sfiConnectedStats, nil)264	s.vt.Unregister(p.ID())265	p.setValueTracker(nil, nil)266}267// recalTimeout calculates the current recommended timeout. This value is used by268// the client as a "soft timeout" value. It also affects the service value calculation269// of individual nodes.270func (s *serverPool) recalTimeout() {271	// Use cached result if possible, avoid recalculating too frequently.272	s.timeoutLock.RLock()273	refreshed := s.timeoutRefreshed274	s.timeoutLock.RUnlock()275	now := s.clock.Now()276	if refreshed != 0 && time.Duration(now-refreshed) < timeoutRefresh {277		return278	}279	// Cached result is stale, recalculate a new one.280	rts := s.vt.RtStats()281	// Add a fake statistic here. It is an easy way to initialize with some282	// conservative values when the database is new. As soon as we have a283	// considerable amount of real stats this small value won't matter.284	rts.Add(time.Second*2, 10, s.vt.StatsExpFactor())285	// Use either 10% failure rate timeout or twice the median response time286	// as the recommended timeout.287	timeout := minTimeout288	if t := rts.Timeout(0.1); t > timeout {289		timeout = t290	}291	if t := rts.Timeout(0.5) * 2; t > timeout {292		timeout = t293	}294	s.timeoutLock.Lock()295	if s.timeout != timeout {296		s.timeout = timeout297		s.timeWeights = lpc.TimeoutWeights(s.timeout)298		suggestedTimeoutGauge.Update(int64(s.timeout / time.Millisecond))299		totalValueGauge.Update(int64(rts.Value(s.timeWeights, s.vt.StatsExpFactor())))300	}301	s.timeoutRefreshed = now302	s.timeoutLock.Unlock()303}304// getTimeout returns the recommended request timeout.305func (s *serverPool) getTimeout() time.Duration {306	s.recalTimeout()307	s.timeoutLock.RLock()308	defer s.timeoutLock.RUnlock()309	return s.timeout310}311// getTimeoutAndWeight returns the recommended request timeout as well as the312// response time weight which is necessary to calculate service value.313func (s *serverPool) getTimeoutAndWeight() (time.Duration, lpc.ResponseTimeWeights) {314	s.recalTimeout()315	s.timeoutLock.RLock()316	defer s.timeoutLock.RUnlock()317	return s.timeout, s.timeWeights318}319// addDialCost adds the given amount of dial cost to the node history and returns the current320// amount of total dial cost321func (s *serverPool) addDialCost(n *nodeHistory, amount int64) uint64 {322	logOffset := s.vt.StatsExpirer().LogOffset(s.clock.Now())323	if amount > 0 {324		n.dialCost.Add(amount, logOffset)325	}326	totalDialCost := n.dialCost.Value(logOffset)327	if totalDialCost < dialCost {328		totalDialCost = dialCost329	}330	return totalDialCost331}332// serviceValue returns the service value accumulated in this session and in total333func (s *serverPool) serviceValue(node *enode.Node) (sessionValue, totalValue float64) {334	nvt := s.vt.GetNode(node.ID())335	if nvt == nil {336		return 0, 0337	}338	currentStats := nvt.RtStats()339	_, timeWeights := s.getTimeoutAndWeight()340	expFactor := s.vt.StatsExpFactor()341	totalValue = currentStats.Value(timeWeights, expFactor)342	if connStats, ok := s.ns.GetField(node, sfiConnectedStats).(lpc.ResponseTimeStats); ok {343		diff := currentStats344		diff.SubStats(&connStats)345		sessionValue = diff.Value(timeWeights, expFactor)346		sessionValueMeter.Mark(int64(sessionValue))347	}348	return349}350// updateWeight calculates the node weight and updates the nodeWeight field and the351// hasValue flag. It also saves the node state if necessary.352func (s *serverPool) updateWeight(node *enode.Node, totalValue float64, totalDialCost uint64) {353	weight := uint64(totalValue * nodeWeightMul / float64(totalDialCost))354	if weight >= nodeWeightThreshold {355		s.ns.SetState(node, sfHasValue, nodestate.Flags{}, 0)356		s.ns.SetField(node, sfiNodeWeight, weight)357	} else {358		s.ns.SetState(node, nodestate.Flags{}, sfHasValue, 0)359		s.ns.SetField(node, sfiNodeWeight, nil)360	}361	s.ns.Persist(node) // saved if node history or hasValue changed362}363// setRedialWait calculates and sets the redialWait timeout based on the service value364// and dial cost accumulated during the last session/attempt and in total.365// The waiting time is raised exponentially if no service value has been received in order366// to prevent dialing an unresponsive node frequently for a very long time just because it367// was useful in the past. It can still be occasionally dialed though and once it provides368// a significant amount of service value again its waiting time is quickly reduced or reset369// to the minimum.370// Note: node weight is also recalculated and updated by this function.371func (s *serverPool) setRedialWait(node *enode.Node, addDialCost int64, waitStep float64) {372	n, _ := s.ns.GetField(node, sfiNodeHistory).(nodeHistory)373	sessionValue, totalValue := s.serviceValue(node)374	totalDialCost := s.addDialCost(&n, addDialCost)375	// if the current dial session has yielded at least the average value/dial cost ratio376	// then the waiting time should be reset to the minimum. If the session value377	// is below average but still positive then timeout is limited to the ratio of378	// average / current service value multiplied by the minimum timeout. If the attempt379	// was unsuccessful then timeout is raised exponentially without limitation.380	// Note: dialCost is used in the formula below even if dial was not attempted at all381	// because the pre-negotiation query did not return a positive result. In this case382	// the ratio has no meaning anyway and waitFactor is always raised, though in smaller383	// steps because queries are cheaper and therefore we can allow more failed attempts.384	unixTime := s.unixTime()385	plannedTimeout := float64(n.redialWaitEnd - n.redialWaitStart) // last planned redialWait timeout386	var actualWait float64                                         // actual waiting time elapsed387	if unixTime > n.redialWaitEnd {388		// the planned timeout has elapsed389		actualWait = plannedTimeout390	} else {391		// if the node was redialed earlier then we do not raise the planned timeout392		// exponentially because that could lead to the timeout rising very high in393		// a short amount of time394		// Note that in case of an early redial actualWait also includes the dial395		// timeout or connection time of the last attempt but it still serves its396		// purpose of preventing the timeout rising quicker than linearly as a function397		// of total time elapsed without a successful connection.398		actualWait = float64(unixTime - n.redialWaitStart)399	}400	// raise timeout exponentially if the last planned timeout has elapsed401	// (use at least the last planned timeout otherwise)402	nextTimeout := actualWait * waitStep403	if plannedTimeout > nextTimeout {404		nextTimeout = plannedTimeout405	}406	// we reduce the waiting time if the server has provided service value during the407	// connection (but never under the minimum)408	a := totalValue * dialCost * float64(minRedialWait)409	b := float64(totalDialCost) * sessionValue410	if a < b*nextTimeout {411		nextTimeout = a / b412	}413	if nextTimeout < minRedialWait {414		nextTimeout = minRedialWait415	}416	wait := time.Duration(float64(time.Second) * nextTimeout)417	if wait < waitThreshold {418		n.redialWaitStart = unixTime419		n.redialWaitEnd = unixTime + int64(nextTimeout)420		s.ns.SetField(node, sfiNodeHistory, n)421		s.ns.SetState(node, sfRedialWait, nodestate.Flags{}, wait)422		s.updateWeight(node, totalValue, totalDialCost)423	} else {424		// discard known node statistics if waiting time is very long because the node425		// hasn't been responsive for a very long time426		s.ns.SetField(node, sfiNodeHistory, nil)427		s.ns.SetField(node, sfiNodeWeight, nil)428		s.ns.SetState(node, nodestate.Flags{}, sfHasValue, 0)429	}430}431// calculateWeight calculates and sets the node weight without altering the node history.432// This function should be called during startup and shutdown only, otherwise setRedialWait433// will keep the weights updated as the underlying statistics are adjusted....

cond_test.go

Source:cond_test.go

...4	"testing"5	"time"6	"github.com/stretchr/testify/assert"7)8func TestTimeoutCondWait(t *testing.T) {9	var wait sync.WaitGroup10	cond := NewCond()11	wait.Add(2)12	go func() {13		cond.Wait()14		wait.Done()15	}()16	time.Sleep(time.Duration(50) * time.Millisecond)17	go func() {18		cond.Signal()19		wait.Done()20	}()21	wait.Wait()22}23func TestTimeoutCondWaitTimeout(t *testing.T) {24	var wait sync.WaitGroup25	cond := NewCond()26	wait.Add(1)27	go func() {28		cond.WaitWithTimeout(time.Duration(500) * time.Millisecond)29		wait.Done()30	}()31	wait.Wait()32}33func TestTimeoutCondWaitTimeoutRemain(t *testing.T) {34	var wait sync.WaitGroup35	cond := NewCond()36	wait.Add(2)37	ch := make(chan time.Duration, 1)38	defer close(ch)39	timeout := time.Duration(2000) * time.Millisecond40	go func() {41		remainTimeout, _ := cond.WaitWithTimeout(timeout)42		ch <- remainTimeout43		wait.Done()44	}()45	sleep(200)46	go func() {47		cond.Signal()48		wait.Done()49	}()50	wait.Wait()51	remainTimeout := <-ch52	assert.True(t, remainTimeout < timeout, "expect remainTimeout %v < %v", remainTimeout, timeout)53	assert.True(t, remainTimeout >= time.Duration(200)*time.Millisecond,54		"expect remainTimeout %v >= 200 millisecond", remainTimeout)55}56func TestSignalNoWait(t *testing.T) {57	cond := NewCond()58	cond.Signal()59}60func sleep(millisecond int) {61	time.Sleep(time.Duration(millisecond) * time.Millisecond)62}...

Timeout

Using AI Code Generation

1import (2func main() {3	c1 := make(chan string, 1)4	go func() {5		time.Sleep(time.Second * 2)6	}()7	select {8		fmt.Println(res)9	case <-time.After(time.Second * 1):10		fmt.Println("timeout 1")11	}12	c2 := make(chan string, 1)13	go func() {14		time.Sleep(time.Second * 2)15	}()16	select {17		fmt.Println(res)18	case <-time.After(time.Second * 3):19		fmt.Println("timeout 2")20	}21}

Timeout

Using AI Code Generation

1import (2func main() {3    c1 := make(chan string, 1)4    go func() {5        time.Sleep(time.Second * 2)6    }()7    select {8        fmt.Println(res)9    case <-time.After(time.Second * 1):10        fmt.Println("timeout 1")11    }12    c2 := make(chan string, 1)13    go func() {14        time.Sleep(time.Second * 2)15    }()16    select {17        fmt.Println(res)18    case <-time.After(time.Second * 3):19        fmt.Println("timeout 2")20    }21}22import (23func main() {24    d := time.Now().Add(50 * time.Millisecond)25    ctx, cancel := context.WithDeadline(context.Background(), d)26    defer cancel()27    select {28    case <-time.After(1 * time.Second):29        fmt.Println("overslept")30    case <-ctx.Done():31        fmt.Println(ctx.Err())32    }33}34import (35func main() {36    ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*50)37    defer cancel()38    select {39    case <-time.After(1 * time.Second):40        fmt.Println("overslept")41    case <-ctx.Done():42        fmt.Println(ctx.Err())43    }44}45import (46func main() {47    ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*50)48    defer cancel()49    select {50    case <-time.After(5 * time.Second):51        fmt.Println("overslept")52    case <-ctx.Done():53        fmt.Println(ctx.Err())54    }55}56import (

Timeout

Using AI Code Generation

1import (2func main() {3    wg.Add(1)4    go func() {5        time.Sleep(2 * time.Second)6        wg.Done()7    }()8    ch := make(chan struct{})9    go func() {10        wg.Wait()11        close(ch)12    }()13    select {14        fmt.Println("Wait completed")15    case <-time.After(1 * time.Second):16        fmt.Println("Wait timed out")17    }18}19import (20func main() {21    wg.Add(1)22    go func() {23        time.Sleep(2 * time.Second)24        wg.Done()25    }()26    ch := make(chan struct{})27    go func() {28        wg.Wait()29        close(ch)30    }()31    select {32        fmt.Println("Wait completed")33    case <-time.After(3 * time.Second):34        fmt.Println("Wait timed out")35    }36}37import (38func main() {39    wg.Add(1)40    go func() {41        time.Sleep(2 * time.Second)42        wg.Done()43    }()44    ch := make(chan struct{})45    go func() {46        wg.Wait()47        close(ch)48    }()49    select {50        fmt.Println("Wait completed")51    case <-time.After(1 * time.Second):52        fmt.Println("Wait timed out")53    }54}55import (56func main() {57    wg.Add(1)58    go func() {59        time.Sleep(2 * time.Second)60        wg.Done()61    }()62    ch := make(chan struct{})63    go func() {64        wg.Wait()65        close(ch)66    }()67    select {68        fmt.Println("Wait completed

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