mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-10 07:34:04 -08:00
85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
// Copyright 2015 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package local
|
|
|
|
import (
|
|
"math"
|
|
|
|
"github.com/prometheus/common/model"
|
|
)
|
|
|
|
type deltaBytes byte
|
|
|
|
const (
|
|
d0 deltaBytes = 0
|
|
d1 deltaBytes = 1
|
|
d2 deltaBytes = 2
|
|
d4 deltaBytes = 4
|
|
d8 deltaBytes = 8
|
|
)
|
|
|
|
func bytesNeededForUnsignedTimestampDelta(deltaT model.Time) deltaBytes {
|
|
switch {
|
|
case deltaT > math.MaxUint32:
|
|
return d8
|
|
case deltaT > math.MaxUint16:
|
|
return d4
|
|
case deltaT > math.MaxUint8:
|
|
return d2
|
|
default:
|
|
return d1
|
|
}
|
|
}
|
|
|
|
func bytesNeededForSignedTimestampDelta(deltaT model.Time) deltaBytes {
|
|
switch {
|
|
case deltaT > math.MaxInt32 || deltaT < math.MinInt32:
|
|
return d8
|
|
case deltaT > math.MaxInt16 || deltaT < math.MinInt16:
|
|
return d4
|
|
case deltaT > math.MaxInt8 || deltaT < math.MinInt8:
|
|
return d2
|
|
default:
|
|
return d1
|
|
}
|
|
}
|
|
|
|
func bytesNeededForIntegerSampleValueDelta(deltaV model.SampleValue) deltaBytes {
|
|
switch {
|
|
case deltaV < math.MinInt32 || deltaV > math.MaxInt32:
|
|
return d8
|
|
case deltaV < math.MinInt16 || deltaV > math.MaxInt16:
|
|
return d4
|
|
case deltaV < math.MinInt8 || deltaV > math.MaxInt8:
|
|
return d2
|
|
case deltaV != 0:
|
|
return d1
|
|
default:
|
|
return d0
|
|
}
|
|
}
|
|
|
|
func max(a, b deltaBytes) deltaBytes {
|
|
if a > b {
|
|
return a
|
|
}
|
|
return b
|
|
}
|
|
|
|
// isInt64 returns true if v can be represented as an int64.
|
|
func isInt64(v model.SampleValue) bool {
|
|
// Note: Using math.Modf is slower than the conversion approach below.
|
|
return model.SampleValue(int64(v)) == v
|
|
}
|