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Start to use json-iterator to improve marshalling of HistogramBucket
Signed-off-by: Jeanette Tan <jeanette.tan@grafana.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| // Copyright 2013 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 model | ||
|
|
||
| import ( | ||
| "math" | ||
| "strconv" | ||
|
|
||
| jsoniter "github.com/json-iterator/go" | ||
| ) | ||
|
|
||
| // from https://github.com/prometheus/prometheus/blob/main/util/jsonutil/marshal.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) | ||
| } | ||
| } | ||
|
|
||
| // adapted from https://github.com/prometheus/prometheus/blob/main/util/jsonutil/marshal.go | ||
| // MarshalValue marshals a point value using the passed jsoniter stream. | ||
| func MarshalValue(f FloatString, stream *jsoniter.Stream) { | ||
| v := float64(f) | ||
| 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(`"`) | ||
| } | ||
|
|
||
| // adapted from https://github.com/prometheus/prometheus/blob/main/web/api/v1/api.go | ||
| func MarshalHistogramBucket(b HistogramBucket, stream *jsoniter.Stream) { | ||
| stream.WriteArrayStart() | ||
| stream.WriteInt32(b.Boundaries) | ||
| stream.WriteMore() | ||
| MarshalValue(b.Lower, stream) | ||
| stream.WriteMore() | ||
| MarshalValue(b.Upper, stream) | ||
| stream.WriteMore() | ||
| MarshalValue(b.Count, stream) | ||
| stream.WriteArrayEnd() | ||
| } |