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-rw-r--r--vendor/github.com/uber/jaeger-client-go/sampler.go446
1 files changed, 189 insertions, 257 deletions
diff --git a/vendor/github.com/uber/jaeger-client-go/sampler.go b/vendor/github.com/uber/jaeger-client-go/sampler.go
index ea6984e02..6195d59c5 100644
--- a/vendor/github.com/uber/jaeger-client-go/sampler.go
+++ b/vendor/github.com/uber/jaeger-client-go/sampler.go
@@ -17,19 +17,14 @@ package jaeger
import (
"fmt"
"math"
- "net/url"
"sync"
- "sync/atomic"
- "time"
- "github.com/uber/jaeger-client-go/log"
"github.com/uber/jaeger-client-go/thrift-gen/sampling"
"github.com/uber/jaeger-client-go/utils"
)
const (
- defaultSamplingRefreshInterval = time.Minute
- defaultMaxOperations = 2000
+ defaultMaxOperations = 2000
)
// Sampler decides whether a new trace should be sampled or not.
@@ -47,9 +42,7 @@ type Sampler interface {
// Equal checks if the `other` sampler is functionally equivalent
// to this sampler.
- // TODO remove this function. This function is used to determine if 2 samplers are equivalent
- // which does not bode well with the adaptive sampler which has to create all the composite samplers
- // for the comparison to occur. This is expensive to do if only one sampler has changed.
+ // TODO (breaking change) remove this function. See PerOperationSampler.Equals for explanation.
Equal(other Sampler) bool
}
@@ -57,17 +50,23 @@ type Sampler interface {
// ConstSampler is a sampler that always makes the same decision.
type ConstSampler struct {
+ legacySamplerV1Base
Decision bool
tags []Tag
}
// NewConstSampler creates a ConstSampler.
-func NewConstSampler(sample bool) Sampler {
+func NewConstSampler(sample bool) *ConstSampler {
tags := []Tag{
{key: SamplerTypeTagKey, value: SamplerTypeConst},
{key: SamplerParamTagKey, value: sample},
}
- return &ConstSampler{Decision: sample, tags: tags}
+ s := &ConstSampler{
+ Decision: sample,
+ tags: tags,
+ }
+ s.delegate = s.IsSampled
+ return s
}
// IsSampled implements IsSampled() of Sampler.
@@ -88,11 +87,17 @@ func (s *ConstSampler) Equal(other Sampler) bool {
return false
}
+// String is used to log sampler details.
+func (s *ConstSampler) String() string {
+ return fmt.Sprintf("ConstSampler(decision=%t)", s.Decision)
+}
+
// -----------------------
// ProbabilisticSampler is a sampler that randomly samples a certain percentage
// of traces.
type ProbabilisticSampler struct {
+ legacySamplerV1Base
samplingRate float64
samplingBoundary uint64
tags []Tag
@@ -114,16 +119,19 @@ func NewProbabilisticSampler(samplingRate float64) (*ProbabilisticSampler, error
}
func newProbabilisticSampler(samplingRate float64) *ProbabilisticSampler {
- samplingRate = math.Max(0.0, math.Min(samplingRate, 1.0))
- tags := []Tag{
+ s := new(ProbabilisticSampler)
+ s.delegate = s.IsSampled
+ return s.init(samplingRate)
+}
+
+func (s *ProbabilisticSampler) init(samplingRate float64) *ProbabilisticSampler {
+ s.samplingRate = math.Max(0.0, math.Min(samplingRate, 1.0))
+ s.samplingBoundary = uint64(float64(maxRandomNumber) * s.samplingRate)
+ s.tags = []Tag{
{key: SamplerTypeTagKey, value: SamplerTypeProbabilistic},
- {key: SamplerParamTagKey, value: samplingRate},
- }
- return &ProbabilisticSampler{
- samplingRate: samplingRate,
- samplingBoundary: uint64(float64(maxRandomNumber) * samplingRate),
- tags: tags,
+ {key: SamplerParamTagKey, value: s.samplingRate},
}
+ return s
}
// SamplingRate returns the sampling probability this sampled was constructed with.
@@ -149,65 +157,104 @@ func (s *ProbabilisticSampler) Equal(other Sampler) bool {
return false
}
+// Update modifies in-place the sampling rate. Locking must be done externally.
+func (s *ProbabilisticSampler) Update(samplingRate float64) error {
+ if samplingRate < 0.0 || samplingRate > 1.0 {
+ return fmt.Errorf("Sampling Rate must be between 0.0 and 1.0, received %f", samplingRate)
+ }
+ s.init(samplingRate)
+ return nil
+}
+
+// String is used to log sampler details.
+func (s *ProbabilisticSampler) String() string {
+ return fmt.Sprintf("ProbabilisticSampler(samplingRate=%v)", s.samplingRate)
+}
+
// -----------------------
-type rateLimitingSampler struct {
+// RateLimitingSampler samples at most maxTracesPerSecond. The distribution of sampled traces follows
+// burstiness of the service, i.e. a service with uniformly distributed requests will have those
+// requests sampled uniformly as well, but if requests are bursty, especially sub-second, then a
+// number of sequential requests can be sampled each second.
+type RateLimitingSampler struct {
+ legacySamplerV1Base
maxTracesPerSecond float64
- rateLimiter utils.RateLimiter
+ rateLimiter *utils.ReconfigurableRateLimiter
tags []Tag
}
-// NewRateLimitingSampler creates a sampler that samples at most maxTracesPerSecond. The distribution of sampled
-// traces follows burstiness of the service, i.e. a service with uniformly distributed requests will have those
-// requests sampled uniformly as well, but if requests are bursty, especially sub-second, then a number of
-// sequential requests can be sampled each second.
-func NewRateLimitingSampler(maxTracesPerSecond float64) Sampler {
- tags := []Tag{
+// NewRateLimitingSampler creates new RateLimitingSampler.
+func NewRateLimitingSampler(maxTracesPerSecond float64) *RateLimitingSampler {
+ s := new(RateLimitingSampler)
+ s.delegate = s.IsSampled
+ return s.init(maxTracesPerSecond)
+}
+
+func (s *RateLimitingSampler) init(maxTracesPerSecond float64) *RateLimitingSampler {
+ if s.rateLimiter == nil {
+ s.rateLimiter = utils.NewRateLimiter(maxTracesPerSecond, math.Max(maxTracesPerSecond, 1.0))
+ } else {
+ s.rateLimiter.Update(maxTracesPerSecond, math.Max(maxTracesPerSecond, 1.0))
+ }
+ s.maxTracesPerSecond = maxTracesPerSecond
+ s.tags = []Tag{
{key: SamplerTypeTagKey, value: SamplerTypeRateLimiting},
{key: SamplerParamTagKey, value: maxTracesPerSecond},
}
- return &rateLimitingSampler{
- maxTracesPerSecond: maxTracesPerSecond,
- rateLimiter: utils.NewRateLimiter(maxTracesPerSecond, math.Max(maxTracesPerSecond, 1.0)),
- tags: tags,
- }
+ return s
}
// IsSampled implements IsSampled() of Sampler.
-func (s *rateLimitingSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+func (s *RateLimitingSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
return s.rateLimiter.CheckCredit(1.0), s.tags
}
-func (s *rateLimitingSampler) Close() {
+// Update reconfigures the rate limiter, while preserving its accumulated balance.
+// Locking must be done externally.
+func (s *RateLimitingSampler) Update(maxTracesPerSecond float64) {
+ if s.maxTracesPerSecond != maxTracesPerSecond {
+ s.init(maxTracesPerSecond)
+ }
+}
+
+// Close does nothing.
+func (s *RateLimitingSampler) Close() {
// nothing to do
}
-func (s *rateLimitingSampler) Equal(other Sampler) bool {
- if o, ok := other.(*rateLimitingSampler); ok {
+// Equal compares with another sampler.
+func (s *RateLimitingSampler) Equal(other Sampler) bool {
+ if o, ok := other.(*RateLimitingSampler); ok {
return s.maxTracesPerSecond == o.maxTracesPerSecond
}
return false
}
+// String is used to log sampler details.
+func (s *RateLimitingSampler) String() string {
+ return fmt.Sprintf("RateLimitingSampler(maxTracesPerSecond=%v)", s.maxTracesPerSecond)
+}
+
// -----------------------
-// GuaranteedThroughputProbabilisticSampler is a sampler that leverages both probabilisticSampler and
-// rateLimitingSampler. The rateLimitingSampler is used as a guaranteed lower bound sampler such that
+// GuaranteedThroughputProbabilisticSampler is a sampler that leverages both ProbabilisticSampler and
+// RateLimitingSampler. The RateLimitingSampler is used as a guaranteed lower bound sampler such that
// every operation is sampled at least once in a time interval defined by the lowerBound. ie a lowerBound
// of 1.0 / (60 * 10) will sample an operation at least once every 10 minutes.
//
-// The probabilisticSampler is given higher priority when tags are emitted, ie. if IsSampled() for both
-// samplers return true, the tags for probabilisticSampler will be used.
+// The ProbabilisticSampler is given higher priority when tags are emitted, ie. if IsSampled() for both
+// samplers return true, the tags for ProbabilisticSampler will be used.
type GuaranteedThroughputProbabilisticSampler struct {
probabilisticSampler *ProbabilisticSampler
- lowerBoundSampler Sampler
+ lowerBoundSampler *RateLimitingSampler
tags []Tag
samplingRate float64
lowerBound float64
}
// NewGuaranteedThroughputProbabilisticSampler returns a delegating sampler that applies both
-// probabilisticSampler and rateLimitingSampler.
+// ProbabilisticSampler and RateLimitingSampler.
func NewGuaranteedThroughputProbabilisticSampler(
lowerBound, samplingRate float64,
) (*GuaranteedThroughputProbabilisticSampler, error) {
@@ -224,8 +271,14 @@ func newGuaranteedThroughputProbabilisticSampler(lowerBound, samplingRate float6
}
func (s *GuaranteedThroughputProbabilisticSampler) setProbabilisticSampler(samplingRate float64) {
- if s.probabilisticSampler == nil || s.samplingRate != samplingRate {
+ if s.probabilisticSampler == nil {
s.probabilisticSampler = newProbabilisticSampler(samplingRate)
+ } else if s.samplingRate != samplingRate {
+ s.probabilisticSampler.init(samplingRate)
+ }
+ // since we don't validate samplingRate, sampler may have clamped it to [0, 1] interval
+ samplingRate = s.probabilisticSampler.SamplingRate()
+ if s.samplingRate != samplingRate || s.tags == nil {
s.samplingRate = s.probabilisticSampler.SamplingRate()
s.tags = []Tag{
{key: SamplerTypeTagKey, value: SamplerTypeLowerBound},
@@ -252,7 +305,7 @@ func (s *GuaranteedThroughputProbabilisticSampler) Close() {
// Equal implements Equal() of Sampler.
func (s *GuaranteedThroughputProbabilisticSampler) Equal(other Sampler) bool {
- // NB The Equal() function is expensive and will be removed. See adaptiveSampler.Equal() for
+ // NB The Equal() function is expensive and will be removed. See PerOperationSampler.Equal() for
// more information.
return false
}
@@ -261,52 +314,116 @@ func (s *GuaranteedThroughputProbabilisticSampler) Equal(other Sampler) bool {
func (s *GuaranteedThroughputProbabilisticSampler) update(lowerBound, samplingRate float64) {
s.setProbabilisticSampler(samplingRate)
if s.lowerBound != lowerBound {
- s.lowerBoundSampler = NewRateLimitingSampler(lowerBound)
+ s.lowerBoundSampler.Update(lowerBound)
s.lowerBound = lowerBound
}
}
// -----------------------
-type adaptiveSampler struct {
+// PerOperationSampler is a delegating sampler that applies GuaranteedThroughputProbabilisticSampler
+// on a per-operation basis.
+type PerOperationSampler struct {
sync.RWMutex
samplers map[string]*GuaranteedThroughputProbabilisticSampler
defaultSampler *ProbabilisticSampler
lowerBound float64
maxOperations int
+
+ // see description in PerOperationSamplerParams
+ operationNameLateBinding bool
}
-// NewAdaptiveSampler returns a delegating sampler that applies both probabilisticSampler and
-// rateLimitingSampler via the guaranteedThroughputProbabilisticSampler. This sampler keeps track of all
-// operations and delegates calls to the respective guaranteedThroughputProbabilisticSampler.
-func NewAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies, maxOperations int) (Sampler, error) {
- return newAdaptiveSampler(strategies, maxOperations), nil
+// NewAdaptiveSampler returns a new PerOperationSampler.
+// Deprecated: please use NewPerOperationSampler.
+func NewAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies, maxOperations int) (*PerOperationSampler, error) {
+ return NewPerOperationSampler(PerOperationSamplerParams{
+ MaxOperations: maxOperations,
+ Strategies: strategies,
+ }), nil
}
-func newAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies, maxOperations int) Sampler {
+// PerOperationSamplerParams defines parameters when creating PerOperationSampler.
+type PerOperationSamplerParams struct {
+ // Max number of operations that will be tracked. Other operations will be given default strategy.
+ MaxOperations int
+
+ // Opt-in feature for applications that require late binding of span name via explicit call to SetOperationName.
+ // When this feature is enabled, the sampler will return retryable=true from OnCreateSpan(), thus leaving
+ // the sampling decision as non-final (and the span as writeable). This may lead to degraded performance
+ // in applications that always provide the correct span name on trace creation.
+ //
+ // For backwards compatibility this option is off by default.
+ OperationNameLateBinding bool
+
+ // Initial configuration of the sampling strategies (usually retrieved from the backend by Remote Sampler).
+ Strategies *sampling.PerOperationSamplingStrategies
+}
+
+// NewPerOperationSampler returns a new PerOperationSampler.
+func NewPerOperationSampler(params PerOperationSamplerParams) *PerOperationSampler {
samplers := make(map[string]*GuaranteedThroughputProbabilisticSampler)
- for _, strategy := range strategies.PerOperationStrategies {
+ for _, strategy := range params.Strategies.PerOperationStrategies {
sampler := newGuaranteedThroughputProbabilisticSampler(
- strategies.DefaultLowerBoundTracesPerSecond,
+ params.Strategies.DefaultLowerBoundTracesPerSecond,
strategy.ProbabilisticSampling.SamplingRate,
)
samplers[strategy.Operation] = sampler
}
- return &adaptiveSampler{
- samplers: samplers,
- defaultSampler: newProbabilisticSampler(strategies.DefaultSamplingProbability),
- lowerBound: strategies.DefaultLowerBoundTracesPerSecond,
- maxOperations: maxOperations,
+ return &PerOperationSampler{
+ samplers: samplers,
+ defaultSampler: newProbabilisticSampler(params.Strategies.DefaultSamplingProbability),
+ lowerBound: params.Strategies.DefaultLowerBoundTracesPerSecond,
+ maxOperations: params.MaxOperations,
+ operationNameLateBinding: params.OperationNameLateBinding,
}
}
-func (s *adaptiveSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+// IsSampled is not used and only exists to match Sampler V1 API.
+// TODO (breaking change) remove when upgrading everything to SamplerV2
+func (s *PerOperationSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+ return false, nil
+}
+
+func (s *PerOperationSampler) trySampling(span *Span, operationName string) (bool, []Tag) {
+ samplerV1 := s.getSamplerForOperation(operationName)
+ var sampled bool
+ var tags []Tag
+ if span.context.samplingState.isLocalRootSpan(span.context.spanID) {
+ sampled, tags = samplerV1.IsSampled(span.context.TraceID(), operationName)
+ }
+ return sampled, tags
+}
+
+// OnCreateSpan implements OnCreateSpan of SamplerV2.
+func (s *PerOperationSampler) OnCreateSpan(span *Span) SamplingDecision {
+ sampled, tags := s.trySampling(span, span.OperationName())
+ return SamplingDecision{Sample: sampled, Retryable: s.operationNameLateBinding, Tags: tags}
+}
+
+// OnSetOperationName implements OnSetOperationName of SamplerV2.
+func (s *PerOperationSampler) OnSetOperationName(span *Span, operationName string) SamplingDecision {
+ sampled, tags := s.trySampling(span, operationName)
+ return SamplingDecision{Sample: sampled, Retryable: false, Tags: tags}
+}
+
+// OnSetTag implements OnSetTag of SamplerV2.
+func (s *PerOperationSampler) OnSetTag(span *Span, key string, value interface{}) SamplingDecision {
+ return SamplingDecision{Sample: false, Retryable: true}
+}
+
+// OnFinishSpan implements OnFinishSpan of SamplerV2.
+func (s *PerOperationSampler) OnFinishSpan(span *Span) SamplingDecision {
+ return SamplingDecision{Sample: false, Retryable: true}
+}
+
+func (s *PerOperationSampler) getSamplerForOperation(operation string) Sampler {
s.RLock()
sampler, ok := s.samplers[operation]
if ok {
defer s.RUnlock()
- return sampler.IsSampled(id, operation)
+ return sampler
}
s.RUnlock()
s.Lock()
@@ -315,18 +432,19 @@ func (s *adaptiveSampler) IsSampled(id TraceID, operation string) (bool, []Tag)
// Check if sampler has already been created
sampler, ok = s.samplers[operation]
if ok {
- return sampler.IsSampled(id, operation)
+ return sampler
}
// Store only up to maxOperations of unique ops.
if len(s.samplers) >= s.maxOperations {
- return s.defaultSampler.IsSampled(id, operation)
+ return s.defaultSampler
}
newSampler := newGuaranteedThroughputProbabilisticSampler(s.lowerBound, s.defaultSampler.SamplingRate())
s.samplers[operation] = newSampler
- return newSampler.IsSampled(id, operation)
+ return newSampler
}
-func (s *adaptiveSampler) Close() {
+// Close invokes Close on all underlying samplers.
+func (s *PerOperationSampler) Close() {
s.Lock()
defer s.Unlock()
for _, sampler := range s.samplers {
@@ -335,16 +453,18 @@ func (s *adaptiveSampler) Close() {
s.defaultSampler.Close()
}
-func (s *adaptiveSampler) Equal(other Sampler) bool {
- // NB The Equal() function is overly expensive for adaptiveSampler since it's composed of multiple
+// Equal is not used.
+// TODO (breaking change) remove this in the future
+func (s *PerOperationSampler) Equal(other Sampler) bool {
+ // NB The Equal() function is overly expensive for PerOperationSampler since it's composed of multiple
// samplers which all need to be initialized before this function can be called for a comparison.
- // Therefore, adaptiveSampler uses the update() function to only alter the samplers that need
+ // Therefore, PerOperationSampler uses the update() function to only alter the samplers that need
// changing. Hence this function always returns false so that the update function can be called.
// Once the Equal() function is removed from the Sampler API, this will no longer be needed.
return false
}
-func (s *adaptiveSampler) update(strategies *sampling.PerOperationSamplingStrategies) {
+func (s *PerOperationSampler) update(strategies *sampling.PerOperationSamplingStrategies) {
s.Lock()
defer s.Unlock()
newSamplers := map[string]*GuaranteedThroughputProbabilisticSampler{}
@@ -369,191 +489,3 @@ func (s *adaptiveSampler) update(strategies *sampling.PerOperationSamplingStrate
}
s.samplers = newSamplers
}
-
-// -----------------------
-
-// RemotelyControlledSampler is a delegating sampler that polls a remote server
-// for the appropriate sampling strategy, constructs a corresponding sampler and
-// delegates to it for sampling decisions.
-type RemotelyControlledSampler struct {
- // These fields must be first in the struct because `sync/atomic` expects 64-bit alignment.
- // Cf. https://github.com/uber/jaeger-client-go/issues/155, https://goo.gl/zW7dgq
- closed int64 // 0 - not closed, 1 - closed
-
- sync.RWMutex
- samplerOptions
-
- serviceName string
- manager sampling.SamplingManager
- doneChan chan *sync.WaitGroup
-}
-
-type httpSamplingManager struct {
- serverURL string
-}
-
-func (s *httpSamplingManager) GetSamplingStrategy(serviceName string) (*sampling.SamplingStrategyResponse, error) {
- var out sampling.SamplingStrategyResponse
- v := url.Values{}
- v.Set("service", serviceName)
- if err := utils.GetJSON(s.serverURL+"?"+v.Encode(), &out); err != nil {
- return nil, err
- }
- return &out, nil
-}
-
-// NewRemotelyControlledSampler creates a sampler that periodically pulls
-// the sampling strategy from an HTTP sampling server (e.g. jaeger-agent).
-func NewRemotelyControlledSampler(
- serviceName string,
- opts ...SamplerOption,
-) *RemotelyControlledSampler {
- options := applySamplerOptions(opts...)
- sampler := &RemotelyControlledSampler{
- samplerOptions: options,
- serviceName: serviceName,
- manager: &httpSamplingManager{serverURL: options.samplingServerURL},
- doneChan: make(chan *sync.WaitGroup),
- }
- go sampler.pollController()
- return sampler
-}
-
-func applySamplerOptions(opts ...SamplerOption) samplerOptions {
- options := samplerOptions{}
- for _, option := range opts {
- option(&options)
- }
- if options.sampler == nil {
- options.sampler = newProbabilisticSampler(0.001)
- }
- if options.logger == nil {
- options.logger = log.NullLogger
- }
- if options.maxOperations <= 0 {
- options.maxOperations = defaultMaxOperations
- }
- if options.samplingServerURL == "" {
- options.samplingServerURL = DefaultSamplingServerURL
- }
- if options.metrics == nil {
- options.metrics = NewNullMetrics()
- }
- if options.samplingRefreshInterval <= 0 {
- options.samplingRefreshInterval = defaultSamplingRefreshInterval
- }
- return options
-}
-
-// IsSampled implements IsSampled() of Sampler.
-func (s *RemotelyControlledSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
- s.RLock()
- defer s.RUnlock()
- return s.sampler.IsSampled(id, operation)
-}
-
-// Close implements Close() of Sampler.
-func (s *RemotelyControlledSampler) Close() {
- if swapped := atomic.CompareAndSwapInt64(&s.closed, 0, 1); !swapped {
- s.logger.Error("Repeated attempt to close the sampler is ignored")
- return
- }
-
- var wg sync.WaitGroup
- wg.Add(1)
- s.doneChan <- &wg
- wg.Wait()
-}
-
-// Equal implements Equal() of Sampler.
-func (s *RemotelyControlledSampler) Equal(other Sampler) bool {
- // NB The Equal() function is expensive and will be removed. See adaptiveSampler.Equal() for
- // more information.
- if o, ok := other.(*RemotelyControlledSampler); ok {
- s.RLock()
- o.RLock()
- defer s.RUnlock()
- defer o.RUnlock()
- return s.sampler.Equal(o.sampler)
- }
- return false
-}
-
-func (s *RemotelyControlledSampler) pollController() {
- ticker := time.NewTicker(s.samplingRefreshInterval)
- defer ticker.Stop()
- s.pollControllerWithTicker(ticker)
-}
-
-func (s *RemotelyControlledSampler) pollControllerWithTicker(ticker *time.Ticker) {
- for {
- select {
- case <-ticker.C:
- s.updateSampler()
- case wg := <-s.doneChan:
- wg.Done()
- return
- }
- }
-}
-
-func (s *RemotelyControlledSampler) getSampler() Sampler {
- s.Lock()
- defer s.Unlock()
- return s.sampler
-}
-
-func (s *RemotelyControlledSampler) setSampler(sampler Sampler) {
- s.Lock()
- defer s.Unlock()
- s.sampler = sampler
-}
-
-func (s *RemotelyControlledSampler) updateSampler() {
- res, err := s.manager.GetSamplingStrategy(s.serviceName)
- if err != nil {
- s.metrics.SamplerQueryFailure.Inc(1)
- s.logger.Infof("Unable to query sampling strategy: %v", err)
- return
- }
- s.Lock()
- defer s.Unlock()
-
- s.metrics.SamplerRetrieved.Inc(1)
- if strategies := res.GetOperationSampling(); strategies != nil {
- s.updateAdaptiveSampler(strategies)
- } else {
- err = s.updateRateLimitingOrProbabilisticSampler(res)
- }
- if err != nil {
- s.metrics.SamplerUpdateFailure.Inc(1)
- s.logger.Infof("Unable to handle sampling strategy response %+v. Got error: %v", res, err)
- return
- }
- s.metrics.SamplerUpdated.Inc(1)
-}
-
-// NB: this function should only be called while holding a Write lock
-func (s *RemotelyControlledSampler) updateAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies) {
- if adaptiveSampler, ok := s.sampler.(*adaptiveSampler); ok {
- adaptiveSampler.update(strategies)
- } else {
- s.sampler = newAdaptiveSampler(strategies, s.maxOperations)
- }
-}
-
-// NB: this function should only be called while holding a Write lock
-func (s *RemotelyControlledSampler) updateRateLimitingOrProbabilisticSampler(res *sampling.SamplingStrategyResponse) error {
- var newSampler Sampler
- if probabilistic := res.GetProbabilisticSampling(); probabilistic != nil {
- newSampler = newProbabilisticSampler(probabilistic.SamplingRate)
- } else if rateLimiting := res.GetRateLimitingSampling(); rateLimiting != nil {
- newSampler = NewRateLimitingSampler(float64(rateLimiting.MaxTracesPerSecond))
- } else {
- return fmt.Errorf("Unsupported sampling strategy type %v", res.GetStrategyType())
- }
- if !s.sampler.Equal(newSampler) {
- s.sampler = newSampler
- }
- return nil
-}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-15 03:08:38 +0000