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0e3f35324b
This has become a requirement for native histograms, as a single histogram sample commonly has many buckets, so that providing many exemplars makes sense. Since OM text doesn't support native histograms yet, the test had to be expanded to also support protobuf test cases. Signed-off-by: beorn7 <beorn@grafana.com>
121 lines
4.4 KiB
Go
121 lines
4.4 KiB
Go
// Copyright 2018 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 textparse
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import (
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"mime"
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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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)
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// Parser parses samples from a byte slice of samples in the official
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// Prometheus and OpenMetrics text exposition formats.
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type Parser interface {
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// Series returns the bytes of a series with a simple float64 as a
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// value, the timestamp if set, and the value of the current sample.
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Series() ([]byte, *int64, float64)
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// Histogram returns the bytes of a series with a sparse histogram as a
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// value, the timestamp if set, and the histogram in the current sample.
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// Depending on the parsed input, the function returns an (integer) Histogram
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// or a FloatHistogram, with the respective other return value being nil.
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Histogram() ([]byte, *int64, *histogram.Histogram, *histogram.FloatHistogram)
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// Help returns the metric name and help text in the current entry.
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// Must only be called after Next returned a help entry.
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// The returned byte slices become invalid after the next call to Next.
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Help() ([]byte, []byte)
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// Type returns the metric name and type in the current entry.
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// Must only be called after Next returned a type entry.
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// The returned byte slices become invalid after the next call to Next.
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Type() ([]byte, MetricType)
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// Unit returns the metric name and unit in the current entry.
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// Must only be called after Next returned a unit entry.
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// The returned byte slices become invalid after the next call to Next.
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Unit() ([]byte, []byte)
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// Comment returns the text of the current comment.
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// Must only be called after Next returned a comment entry.
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// The returned byte slice becomes invalid after the next call to Next.
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Comment() []byte
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// Metric writes the labels of the current sample into the passed labels.
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// It returns the string from which the metric was parsed.
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Metric(l *labels.Labels) string
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// Exemplar writes the exemplar of the current sample into the passed
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// exemplar. It can be called repeatedly to retrieve multiple exemplars
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// for the same sample. It returns false once all exemplars are
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// retrieved (including the case where no exemplars exist at all).
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Exemplar(l *exemplar.Exemplar) bool
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// Next advances the parser to the next sample. It returns false if no
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// more samples were read or an error occurred.
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Next() (Entry, error)
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}
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// New returns a new parser of the byte slice.
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//
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// This function always returns a valid parser, but might additionally
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// return an error if the content type cannot be parsed.
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func New(b []byte, contentType string, parseClassicHistograms bool) (Parser, error) {
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if contentType == "" {
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return NewPromParser(b), nil
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}
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mediaType, _, err := mime.ParseMediaType(contentType)
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if err != nil {
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return NewPromParser(b), err
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}
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switch mediaType {
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case "application/openmetrics-text":
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return NewOpenMetricsParser(b), nil
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case "application/vnd.google.protobuf":
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return NewProtobufParser(b, parseClassicHistograms), nil
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default:
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return NewPromParser(b), nil
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}
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}
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// Entry represents the type of a parsed entry.
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type Entry int
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const (
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EntryInvalid Entry = -1
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EntryType Entry = 0
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EntryHelp Entry = 1
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EntrySeries Entry = 2 // A series with a simple float64 as value.
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EntryComment Entry = 3
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EntryUnit Entry = 4
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EntryHistogram Entry = 5 // A series with a native histogram as a value.
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)
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// MetricType represents metric type values.
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type MetricType string
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const (
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MetricTypeCounter = MetricType("counter")
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MetricTypeGauge = MetricType("gauge")
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MetricTypeHistogram = MetricType("histogram")
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MetricTypeGaugeHistogram = MetricType("gaugehistogram")
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MetricTypeSummary = MetricType("summary")
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MetricTypeInfo = MetricType("info")
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MetricTypeStateset = MetricType("stateset")
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MetricTypeUnknown = MetricType("unknown")
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)
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