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84 lines
2.0 KiB
84 lines
2.0 KiB
// Copyright 2015 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 local |
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import ( |
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"math" |
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clientmodel "github.com/prometheus/client_golang/model" |
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) |
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type deltaBytes byte |
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const ( |
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d0 deltaBytes = 0 |
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d1 deltaBytes = 1 |
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d2 deltaBytes = 2 |
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d4 deltaBytes = 4 |
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d8 deltaBytes = 8 |
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) |
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func bytesNeededForUnsignedTimestampDelta(deltaT clientmodel.Timestamp) deltaBytes { |
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switch { |
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case deltaT > math.MaxUint32: |
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return d8 |
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case deltaT > math.MaxUint16: |
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return d4 |
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case deltaT > math.MaxUint8: |
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return d2 |
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default: |
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return d1 |
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} |
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} |
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func bytesNeededForSignedTimestampDelta(deltaT clientmodel.Timestamp) deltaBytes { |
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switch { |
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case deltaT > math.MaxInt32 || deltaT < math.MinInt32: |
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return d8 |
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case deltaT > math.MaxInt16 || deltaT < math.MinInt16: |
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return d4 |
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case deltaT > math.MaxInt8 || deltaT < math.MinInt8: |
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return d2 |
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default: |
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return d1 |
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} |
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} |
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func bytesNeededForIntegerSampleValueDelta(deltaV clientmodel.SampleValue) deltaBytes { |
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switch { |
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case deltaV < math.MinInt32 || deltaV > math.MaxInt32: |
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return d8 |
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case deltaV < math.MinInt16 || deltaV > math.MaxInt16: |
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return d4 |
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case deltaV < math.MinInt8 || deltaV > math.MaxInt8: |
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return d2 |
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case deltaV != 0: |
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return d1 |
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default: |
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return d0 |
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} |
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} |
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func max(a, b deltaBytes) deltaBytes { |
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if a > b { |
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return a |
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} |
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return b |
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} |
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// isInt64 returns true if v can be represented as an int64. |
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func isInt64(v clientmodel.SampleValue) bool { |
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// Note: Using math.Modf is slower than the conversion approach below. |
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return clientmodel.SampleValue(int64(v)) == v |
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}
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