mirror of
https://github.com/prometheus/prometheus.git
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92 lines
2.9 KiB
Go
92 lines
2.9 KiB
Go
// 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 scrape
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import (
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"bytes"
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"context"
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"encoding/binary"
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"testing"
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"github.com/gogo/protobuf/proto"
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dto "github.com/prometheus/client_model/go"
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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/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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"github.com/prometheus/prometheus/util/teststorage"
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)
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// For readability.
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type sample = teststorage.Sample
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type nopAppendable struct{}
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func (nopAppendable) Appender(context.Context) storage.Appender {
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return nopAppender{}
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}
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type nopAppender struct{}
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func (nopAppender) SetOptions(*storage.AppendOptions) {}
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func (nopAppender) Append(storage.SeriesRef, labels.Labels, int64, float64) (storage.SeriesRef, error) {
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return 1, nil
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}
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func (nopAppender) AppendExemplar(storage.SeriesRef, labels.Labels, exemplar.Exemplar) (storage.SeriesRef, error) {
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return 2, nil
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}
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func (nopAppender) AppendHistogram(storage.SeriesRef, labels.Labels, int64, *histogram.Histogram, *histogram.FloatHistogram) (storage.SeriesRef, error) {
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return 3, nil
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}
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func (nopAppender) AppendHistogramSTZeroSample(storage.SeriesRef, labels.Labels, int64, int64, *histogram.Histogram, *histogram.FloatHistogram) (storage.SeriesRef, error) {
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return 0, nil
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}
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func (nopAppender) UpdateMetadata(storage.SeriesRef, labels.Labels, metadata.Metadata) (storage.SeriesRef, error) {
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return 4, nil
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}
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func (nopAppender) AppendSTZeroSample(storage.SeriesRef, labels.Labels, int64, int64) (storage.SeriesRef, error) {
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return 5, nil
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}
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func (nopAppender) Commit() error { return nil }
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func (nopAppender) Rollback() error { return nil }
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// protoMarshalDelimited marshals a MetricFamily into a delimited
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// Prometheus proto exposition format bytes (known as `encoding=delimited`)
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//
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// See also https://eli.thegreenplace.net/2011/08/02/length-prefix-framing-for-protocol-buffers
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func protoMarshalDelimited(t *testing.T, mf *dto.MetricFamily) []byte {
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t.Helper()
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protoBuf, err := proto.Marshal(mf)
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require.NoError(t, err)
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varintBuf := make([]byte, binary.MaxVarintLen32)
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varintLength := binary.PutUvarint(varintBuf, uint64(len(protoBuf)))
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buf := &bytes.Buffer{}
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buf.Write(varintBuf[:varintLength])
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buf.Write(protoBuf)
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return buf.Bytes()
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}
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