mirror of
https://github.com/prometheus/prometheus.git
synced 2025-12-04 00:51:02 +01:00
64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
// Copyright 2013 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/histogram"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/storage"
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)
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type nopAppendable struct{}
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func (nopAppendable) AppenderV2(context.Context) storage.AppenderV2 {
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return nopAppender{}
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}
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type nopAppender struct{}
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func (nopAppender) Append(ref storage.SeriesRef, ls labels.Labels, st, t int64, v float64, h *histogram.Histogram, fh *histogram.FloatHistogram, opts storage.AOptions) (storage.SeriesRef, error) {
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return 1, 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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