refactor(scrape)[PART2]: simplified scrapeLoop constructors & tests; add teststorage.Appendable mock (#17631)
* refactor(scrape): simplified scrapeLoop constructors & tests; add teststorage.Appender mock Signed-off-by: bwplotka <bwplotka@gmail.com> debug * refactor(scrape): simplified newLoop even more Signed-off-by: bwplotka <bwplotka@gmail.com> * refactor(scrape): rename sl -> app, slApp -> app Signed-off-by: bwplotka <bwplotka@gmail.com> * fix TestScrapeLoopRun flakiness Signed-off-by: bwplotka <bwplotka@gmail.com> * fix lint Signed-off-by: bwplotka <bwplotka@gmail.com> * kill unused listSeriesSet code Signed-off-by: bwplotka <bwplotka@gmail.com> * fix closing to not panic Signed-off-by: bwplotka <bwplotka@gmail.com> * added extra benchmark for scrapeAndReport Signed-off-by: bwplotka <bwplotka@gmail.com> * added extra benchmark for restartLoops Signed-off-by: bwplotka <bwplotka@gmail.com> * addressed last comments Signed-off-by: bwplotka <bwplotka@gmail.com> * fix TestConcurrentAppender_ReturnsErrAppender naming Signed-off-by: bwplotka <bwplotka@gmail.com> * addressed small comments Signed-off-by: bwplotka <bwplotka@gmail.com> * refactor(scrape): ensure scrape config is reloaded; added test Signed-off-by: bwplotka <bwplotka@gmail.com> * addressed comments. Signed-off-by: bwplotka <bwplotka@gmail.com> --------- Signed-off-by: bwplotka <bwplotka@gmail.com>pull/17727/head
Bartlomiej Plotka
4 weeks ago
committed by
GitHub
parent
e4b6d443fc
commit
17e06dbab5
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@ -0,0 +1,399 @@ |
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// Copyright The Prometheus Authors
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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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package teststorage |
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import ( |
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"context" |
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"errors" |
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"fmt" |
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"math" |
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"slices" |
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"strings" |
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"sync" |
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"github.com/prometheus/common/model" |
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"go.uber.org/atomic" |
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"github.com/prometheus/prometheus/model/exemplar" |
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"github.com/prometheus/prometheus/model/histogram" |
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"github.com/prometheus/prometheus/model/labels" |
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"github.com/prometheus/prometheus/model/metadata" |
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"github.com/prometheus/prometheus/storage" |
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) |
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// Sample represents test, combined sample for mocking storage.AppenderV2.
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type Sample struct { |
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MF string |
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L labels.Labels |
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M metadata.Metadata |
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ST, T int64 |
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V float64 |
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H *histogram.Histogram |
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FH *histogram.FloatHistogram |
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ES []exemplar.Exemplar |
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} |
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func (s Sample) String() string { |
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// Attempting to format similar to ~ OpenMetrics 2.0 for readability.
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b := strings.Builder{} |
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if s.M.Help != "" { |
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b.WriteString("HELP ") |
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b.WriteString(s.M.Help) |
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b.WriteString("\n") |
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} |
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if s.M.Type != model.MetricTypeUnknown && s.M.Type != "" { |
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b.WriteString("type@") |
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b.WriteString(string(s.M.Type)) |
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b.WriteString(" ") |
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} |
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if s.M.Unit != "" { |
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b.WriteString("unit@") |
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b.WriteString(s.M.Unit) |
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b.WriteString(" ") |
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} |
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// Print all value types on purpose, to catch bugs for appending multiple sample types at once.
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h := "" |
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if s.H != nil { |
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h = s.H.String() |
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} |
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fh := "" |
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if s.FH != nil { |
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fh = s.FH.String() |
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} |
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b.WriteString(fmt.Sprintf("%s %v%v%v st@%v t@%v\n", s.L.String(), s.V, h, fh, s.ST, s.T)) |
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return b.String() |
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} |
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func (s Sample) Equals(other Sample) bool { |
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return strings.Compare(s.MF, other.MF) == 0 && |
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labels.Equal(s.L, other.L) && |
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s.M.Equals(other.M) && |
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s.ST == other.ST && |
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s.T == other.T && |
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math.Float64bits(s.V) == math.Float64bits(other.V) && // Compare Float64bits so NaN values which are exactly the same will compare equal.
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s.H.Equals(other.H) && |
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s.FH.Equals(other.FH) && |
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slices.EqualFunc(s.ES, other.ES, exemplar.Exemplar.Equals) |
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} |
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// Appendable is a storage.Appendable mock.
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// It allows recording all samples that were added through the appender and injecting errors.
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// Appendable will panic if more than one Appender is open.
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type Appendable struct { |
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appendErrFn func(ls labels.Labels) error // If non-nil, inject appender error on every Append, AppendHistogram and ST zero calls.
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appendExemplarsError error // If non-nil, inject exemplar error.
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commitErr error // If non-nil, inject commit error.
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mtx sync.Mutex |
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openAppenders atomic.Int32 // Guard against multi-appender use.
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// Recorded results.
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pendingSamples []Sample |
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resultSamples []Sample |
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rolledbackSamples []Sample |
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// Optional chain (Appender will collect samples, then run next).
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next storage.Appendable |
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} |
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// NewAppendable returns mock Appendable.
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func NewAppendable() *Appendable { |
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return &Appendable{} |
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} |
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// Then chains another appender from the provided appendable for the Appender calls.
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func (a *Appendable) Then(appendable storage.Appendable) *Appendable { |
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a.next = appendable |
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return a |
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} |
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// WithErrs allows injecting errors to the appender.
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func (a *Appendable) WithErrs(appendErrFn func(ls labels.Labels) error, appendExemplarsError, commitErr error) *Appendable { |
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a.appendErrFn = appendErrFn |
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a.appendExemplarsError = appendExemplarsError |
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a.commitErr = commitErr |
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return a |
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} |
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// PendingSamples returns pending samples (samples appended without commit).
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func (a *Appendable) PendingSamples() []Sample { |
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a.mtx.Lock() |
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defer a.mtx.Unlock() |
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ret := make([]Sample, len(a.pendingSamples)) |
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copy(ret, a.pendingSamples) |
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return ret |
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} |
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// ResultSamples returns committed samples.
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func (a *Appendable) ResultSamples() []Sample { |
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a.mtx.Lock() |
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defer a.mtx.Unlock() |
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ret := make([]Sample, len(a.resultSamples)) |
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copy(ret, a.resultSamples) |
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return ret |
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} |
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// RolledbackSamples returns rolled back samples.
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func (a *Appendable) RolledbackSamples() []Sample { |
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a.mtx.Lock() |
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defer a.mtx.Unlock() |
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ret := make([]Sample, len(a.rolledbackSamples)) |
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copy(ret, a.rolledbackSamples) |
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return ret |
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} |
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func (a *Appendable) ResultReset() { |
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a.mtx.Lock() |
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defer a.mtx.Unlock() |
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a.pendingSamples = a.pendingSamples[:0] |
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a.resultSamples = a.resultSamples[:0] |
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a.rolledbackSamples = a.rolledbackSamples[:0] |
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} |
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// ResultMetadata returns resultSamples with samples only containing L and M.
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// This is for compatibility with tests that only focus on metadata.
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//
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// TODO: Rewrite tests to test metadata on resultSamples instead.
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func (a *Appendable) ResultMetadata() []Sample { |
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a.mtx.Lock() |
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defer a.mtx.Unlock() |
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var ret []Sample |
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for _, s := range a.resultSamples { |
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if s.M.IsEmpty() { |
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continue |
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} |
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ret = append(ret, Sample{L: s.L, M: s.M}) |
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} |
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return ret |
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} |
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func (a *Appendable) String() string { |
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var sb strings.Builder |
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sb.WriteString("committed:\n") |
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for _, s := range a.resultSamples { |
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sb.WriteString("\n") |
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sb.WriteString(s.String()) |
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} |
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sb.WriteString("pending:\n") |
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for _, s := range a.pendingSamples { |
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sb.WriteString("\n") |
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sb.WriteString(s.String()) |
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} |
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sb.WriteString("rolledback:\n") |
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for _, s := range a.rolledbackSamples { |
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sb.WriteString("\n") |
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sb.WriteString(s.String()) |
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} |
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return sb.String() |
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} |
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var errClosedAppender = errors.New("appender was already committed/rolledback") |
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type appender struct { |
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err error |
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next storage.Appender |
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a *Appendable |
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} |
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func (a *appender) checkErr() error { |
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a.a.mtx.Lock() |
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defer a.a.mtx.Unlock() |
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return a.err |
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} |
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func (a *Appendable) Appender(ctx context.Context) storage.Appender { |
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ret := &appender{a: a} |
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if a.openAppenders.Inc() > 1 { |
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ret.err = errors.New("teststorage.Appendable.Appender() concurrent use is not supported; attempted opening new Appender() without Commit/Rollback of the previous one. Extend the implementation if concurrent mock is needed") |
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} |
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if a.next != nil { |
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ret.next = a.next.Appender(ctx) |
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} |
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return ret |
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} |
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func (*appender) SetOptions(*storage.AppendOptions) {} |
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func (a *appender) Append(ref storage.SeriesRef, ls labels.Labels, t int64, v float64) (storage.SeriesRef, error) { |
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if err := a.checkErr(); err != nil { |
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return 0, err |
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} |
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if a.a.appendErrFn != nil { |
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if err := a.a.appendErrFn(ls); err != nil { |
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return 0, err |
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} |
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} |
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a.a.mtx.Lock() |
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a.a.pendingSamples = append(a.a.pendingSamples, Sample{L: ls, T: t, V: v}) |
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a.a.mtx.Unlock() |
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if a.next != nil { |
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return a.next.Append(ref, ls, t, v) |
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} |
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return computeOrCheckRef(ref, ls) |
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} |
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func computeOrCheckRef(ref storage.SeriesRef, ls labels.Labels) (storage.SeriesRef, error) { |
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h := ls.Hash() |
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if ref == 0 { |
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// Use labels hash as a stand-in for unique series reference, to avoid having to track all series.
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return storage.SeriesRef(h), nil |
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} |
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if storage.SeriesRef(h) != ref { |
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// Check for buggy ref while we at it.
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return 0, errors.New("teststorage.appender: found input ref not matching labels; potential bug in Appendable user") |
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} |
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return ref, nil |
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} |
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func (a *appender) AppendHistogram(ref storage.SeriesRef, ls labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) { |
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if err := a.checkErr(); err != nil { |
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return 0, err |
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} |
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if a.a.appendErrFn != nil { |
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if err := a.a.appendErrFn(ls); err != nil { |
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return 0, err |
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} |
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} |
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a.a.mtx.Lock() |
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a.a.pendingSamples = append(a.a.pendingSamples, Sample{L: ls, T: t, H: h, FH: fh}) |
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a.a.mtx.Unlock() |
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if a.next != nil { |
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return a.next.AppendHistogram(ref, ls, t, h, fh) |
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} |
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return computeOrCheckRef(ref, ls) |
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} |
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func (a *appender) AppendExemplar(ref storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) { |
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if err := a.checkErr(); err != nil { |
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return 0, err |
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} |
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if a.a.appendExemplarsError != nil { |
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return 0, a.a.appendExemplarsError |
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} |
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a.a.mtx.Lock() |
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// NOTE(bwplotka): Eventually exemplar has to be attached to a series and soon
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// the AppenderV2 will guarantee that for TSDB. Assume this from the mock perspective
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// with the naive attaching. See: https://github.com/prometheus/prometheus/issues/17632
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i := len(a.a.pendingSamples) - 1 |
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for ; i >= 0; i-- { // Attach exemplars to the last matching sample.
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if ref == storage.SeriesRef(a.a.pendingSamples[i].L.Hash()) { |
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a.a.pendingSamples[i].ES = append(a.a.pendingSamples[i].ES, e) |
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break |
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} |
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} |
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a.a.mtx.Unlock() |
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if i < 0 { |
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return 0, fmt.Errorf("teststorage.appender: exemplar appender without series; ref %v; l %v; exemplar: %v", ref, l, e) |
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} |
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if a.next != nil { |
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return a.next.AppendExemplar(ref, l, e) |
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} |
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return computeOrCheckRef(ref, l) |
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} |
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func (a *appender) AppendSTZeroSample(ref storage.SeriesRef, l labels.Labels, _, st int64) (storage.SeriesRef, error) { |
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return a.Append(ref, l, st, 0.0) // This will change soon with AppenderV2, but we already report ST as 0 samples.
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} |
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func (a *appender) AppendHistogramSTZeroSample(ref storage.SeriesRef, l labels.Labels, _, st int64, h *histogram.Histogram, _ *histogram.FloatHistogram) (storage.SeriesRef, error) { |
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if h != nil { |
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return a.AppendHistogram(ref, l, st, &histogram.Histogram{}, nil) |
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} |
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return a.AppendHistogram(ref, l, st, nil, &histogram.FloatHistogram{}) // This will change soon with AppenderV2, but we already report ST as 0 histograms.
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} |
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func (a *appender) UpdateMetadata(ref storage.SeriesRef, l labels.Labels, m metadata.Metadata) (storage.SeriesRef, error) { |
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if err := a.checkErr(); err != nil { |
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return 0, err |
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} |
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a.a.mtx.Lock() |
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// NOTE(bwplotka): Eventually metadata has to be attached to a series and soon
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// the AppenderV2 will guarantee that for TSDB. Assume this from the mock perspective
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// with the naive attaching. See: https://github.com/prometheus/prometheus/issues/17632
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i := len(a.a.pendingSamples) - 1 |
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for ; i >= 0; i-- { // Attach metadata to the last matching sample.
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if ref == storage.SeriesRef(a.a.pendingSamples[i].L.Hash()) { |
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a.a.pendingSamples[i].M = m |
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break |
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} |
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} |
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a.a.mtx.Unlock() |
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if i < 0 { |
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return 0, fmt.Errorf("teststorage.appender: metadata update without series; ref %v; l %v; m: %v", ref, l, m) |
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} |
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if a.next != nil { |
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return a.next.UpdateMetadata(ref, l, m) |
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} |
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return computeOrCheckRef(ref, l) |
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} |
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func (a *appender) Commit() error { |
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if err := a.checkErr(); err != nil { |
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return err |
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} |
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defer a.a.openAppenders.Dec() |
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if a.a.commitErr != nil { |
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return a.a.commitErr |
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} |
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a.a.mtx.Lock() |
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a.a.resultSamples = append(a.a.resultSamples, a.a.pendingSamples...) |
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a.a.pendingSamples = a.a.pendingSamples[:0] |
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a.err = errClosedAppender |
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a.a.mtx.Unlock() |
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if a.a.next != nil { |
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return a.next.Commit() |
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} |
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return nil |
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} |
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func (a *appender) Rollback() error { |
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if err := a.checkErr(); err != nil { |
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return err |
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} |
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defer a.a.openAppenders.Dec() |
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a.a.mtx.Lock() |
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a.a.rolledbackSamples = append(a.a.rolledbackSamples, a.a.pendingSamples...) |
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a.a.pendingSamples = a.a.pendingSamples[:0] |
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a.err = errClosedAppender |
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a.a.mtx.Unlock() |
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if a.next != nil { |
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return a.next.Rollback() |
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} |
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return nil |
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} |
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@ -0,0 +1,131 @@ |
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// Copyright The Prometheus Authors
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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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package teststorage |
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import ( |
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"errors" |
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"fmt" |
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"testing" |
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"github.com/google/go-cmp/cmp" |
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"github.com/stretchr/testify/require" |
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"github.com/prometheus/prometheus/model/exemplar" |
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"github.com/prometheus/prometheus/model/labels" |
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"github.com/prometheus/prometheus/model/metadata" |
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"github.com/prometheus/prometheus/util/testutil" |
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) |
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// TestSample_RequireEqual ensures standard testutil.RequireEqual is enough for comparisons.
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// This is thanks to the fact metadata has now Equals method.
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func TestSample_RequireEqual(t *testing.T) { |
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a := []Sample{ |
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{}, |
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{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter", Unit: "metric", Help: "some help text"}}, |
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{L: labels.FromStrings("__name__", "test_metric2", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 123.123}, |
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{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo")}}}, |
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} |
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testutil.RequireEqual(t, a, a) |
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b1 := []Sample{ |
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{}, |
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{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter", Unit: "metric", Help: "some help text"}}, |
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{L: labels.FromStrings("__name__", "test_metric2_diff", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 123.123}, // test_metric2_diff is different.
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{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo")}}}, |
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} |
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requireNotEqual(t, a, b1) |
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b2 := []Sample{ |
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{}, |
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{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter", Unit: "metric", Help: "some help text"}}, |
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{L: labels.FromStrings("__name__", "test_metric2", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 123.123}, |
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{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo2")}}}, // exemplar is different.
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} |
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requireNotEqual(t, a, b2) |
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b3 := []Sample{ |
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{}, |
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{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter", Unit: "metric", Help: "some help text"}}, |
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{L: labels.FromStrings("__name__", "test_metric2", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 123.123, T: 123}, // Timestamp is different.
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{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo")}}}, |
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} |
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requireNotEqual(t, a, b3) |
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|
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b4 := []Sample{ |
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{}, |
||||
{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter", Unit: "metric", Help: "some help text"}}, |
||||
{L: labels.FromStrings("__name__", "test_metric2", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 456.456}, // Value is different.
|
||||
{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo")}}}, |
||||
} |
||||
requireNotEqual(t, a, b4) |
||||
|
||||
b5 := []Sample{ |
||||
{}, |
||||
{L: labels.FromStrings("__name__", "test_metric_total"), M: metadata.Metadata{Type: "counter2", Unit: "metric", Help: "some help text"}}, // Different type.
|
||||
{L: labels.FromStrings("__name__", "test_metric2", "foo", "bar"), M: metadata.Metadata{Type: "gauge", Unit: "", Help: "other help text"}, V: 123.123}, |
||||
{ES: []exemplar.Exemplar{{Labels: labels.FromStrings("__name__", "yolo")}}}, |
||||
} |
||||
requireNotEqual(t, a, b5) |
||||
} |
||||
|
||||
// TODO(bwplotka): While this mimick testutil.RequireEqual just making it negative, this does not literally test
|
||||
// testutil.RequireEqual. Either build test suita that mocks `testing.TB` or get rid of testutil.RequireEqual somehow.
|
||||
func requireNotEqual(t testing.TB, a, b any) { |
||||
t.Helper() |
||||
if !cmp.Equal(a, b, cmp.Comparer(labels.Equal)) { |
||||
return |
||||
} |
||||
require.Fail(t, fmt.Sprintf("Equal, but expected not: \n"+ |
||||
"a: %s\n"+ |
||||
"b: %s", a, b)) |
||||
} |
||||
|
||||
func TestConcurrentAppender_ReturnsErrAppender(t *testing.T) { |
||||
a := NewAppendable() |
||||
|
||||
// Non-concurrent multiple use if fine.
|
||||
app := a.Appender(t.Context()) |
||||
require.Equal(t, int32(1), a.openAppenders.Load()) |
||||
require.NoError(t, app.Commit()) |
||||
// Repeated commit fails.
|
||||
require.Error(t, app.Commit()) |
||||
|
||||
app = a.Appender(t.Context()) |
||||
require.NoError(t, app.Rollback()) |
||||
// Commit after rollback fails.
|
||||
require.Error(t, app.Commit()) |
||||
|
||||
a.WithErrs( |
||||
nil, |
||||
nil, |
||||
errors.New("commit err"), |
||||
) |
||||
app = a.Appender(t.Context()) |
||||
require.Error(t, app.Commit()) |
||||
|
||||
a.WithErrs(nil, nil, nil) |
||||
app = a.Appender(t.Context()) |
||||
require.NoError(t, app.Commit()) |
||||
require.Equal(t, int32(0), a.openAppenders.Load()) |
||||
|
||||
// Concurrent use should return appender that errors.
|
||||
_ = a.Appender(t.Context()) |
||||
app = a.Appender(t.Context()) |
||||
_, err := app.Append(0, labels.EmptyLabels(), 0, 0) |
||||
require.Error(t, err) |
||||
_, err = app.AppendHistogram(0, labels.EmptyLabels(), 0, nil, nil) |
||||
require.Error(t, err) |
||||
require.Error(t, app.Commit()) |
||||
require.Error(t, app.Rollback()) |
||||
} |
||||
Loading…
Reference in new issue