mirror of
https://github.com/prometheus/prometheus.git
synced 2025-10-31 00:11:23 +01:00
e4b87a7a2a
Export `marshalTimestamp` and `marshalValue` functions by moving them under their own util package. Signed-off-by: Miguel Ángel Ortuño <ortuman@gmail.com>
63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Copyright 2022 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 jsonutil
|
|
|
|
import (
|
|
"math"
|
|
"strconv"
|
|
|
|
jsoniter "github.com/json-iterator/go"
|
|
)
|
|
|
|
// MarshalTimestamp marshals a point timestamp using the passed jsoniter stream.
|
|
func MarshalTimestamp(t int64, stream *jsoniter.Stream) {
|
|
// Write out the timestamp as a float divided by 1000.
|
|
// This is ~3x faster than converting to a float.
|
|
if t < 0 {
|
|
stream.WriteRaw(`-`)
|
|
t = -t
|
|
}
|
|
stream.WriteInt64(t / 1000)
|
|
fraction := t % 1000
|
|
if fraction != 0 {
|
|
stream.WriteRaw(`.`)
|
|
if fraction < 100 {
|
|
stream.WriteRaw(`0`)
|
|
}
|
|
if fraction < 10 {
|
|
stream.WriteRaw(`0`)
|
|
}
|
|
stream.WriteInt64(fraction)
|
|
}
|
|
}
|
|
|
|
// MarshalValue marshals a point value using the passed jsoniter stream.
|
|
func MarshalValue(v float64, stream *jsoniter.Stream) {
|
|
stream.WriteRaw(`"`)
|
|
// Taken from https://github.com/json-iterator/go/blob/master/stream_float.go#L71 as a workaround
|
|
// to https://github.com/json-iterator/go/issues/365 (jsoniter, to follow json standard, doesn't allow inf/nan).
|
|
buf := stream.Buffer()
|
|
abs := math.Abs(v)
|
|
fmt := byte('f')
|
|
// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
|
|
if abs != 0 {
|
|
if abs < 1e-6 || abs >= 1e21 {
|
|
fmt = 'e'
|
|
}
|
|
}
|
|
buf = strconv.AppendFloat(buf, v, fmt, -1, 64)
|
|
stream.SetBuffer(buf)
|
|
stream.WriteRaw(`"`)
|
|
}
|