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// 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 (
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
)
type FloatString float64
func (v FloatString) String() string {
return strconv.FormatFloat(float64(v), 'f', -1, 64)
}
func (v FloatString) MarshalJSON() ([]byte, error) {
return json.Marshal(v.String())
}
func (v *FloatString) UnmarshalJSON(b []byte) error {
if len(b) < 2 || b[0] != '"' || b[len(b)-1] != '"' {
return errors.New("float value must be a quoted string")
}
f, err := strconv.ParseFloat(string(b[1:len(b)-1]), 64)
if err != nil {
return err
}
*v = FloatString(f)
return nil
}
type HistogramBucket struct {
Boundaries int32
Lower FloatString
Upper FloatString
Count FloatString
}
func (s HistogramBucket) MarshalJSON() ([]byte, error) {
b, err := json.Marshal(s.Boundaries)
if err != nil {
return nil, err
}
l, err := json.Marshal(s.Lower)
if err != nil {
return nil, err
}
u, err := json.Marshal(s.Upper)
if err != nil {
return nil, err
}
c, err := json.Marshal(s.Count)
if err != nil {
return nil, err
}
return []byte(fmt.Sprintf("[%s,%s,%s,%s]", b, l, u, c)), nil
}
func (s *HistogramBucket) UnmarshalJSON(buf []byte) error {
tmp := []interface{}{&s.Boundaries, &s.Lower, &s.Upper, &s.Count}
wantLen := len(tmp)
if err := json.Unmarshal(buf, &tmp); err != nil {
return err
}
if gotLen := len(tmp); gotLen != wantLen {
return fmt.Errorf("wrong number of fields: %d != %d", gotLen, wantLen)
}
return nil
}
func (s *HistogramBucket) Equal(o *HistogramBucket) bool {
return s == o || (s.Boundaries == o.Boundaries && s.Lower == o.Lower && s.Upper == o.Upper && s.Count == o.Count)
}
func (b HistogramBucket) String() string {
var sb strings.Builder
lowerInclusive := b.Boundaries == 1 || b.Boundaries == 3
upperInclusive := b.Boundaries == 0 || b.Boundaries == 3
if lowerInclusive {
sb.WriteRune('[')
} else {
sb.WriteRune('(')
}
fmt.Fprintf(&sb, "%g,%g", b.Lower, b.Upper)
if upperInclusive {
sb.WriteRune(']')
} else {
sb.WriteRune(')')
}
fmt.Fprintf(&sb, ":%v", b.Count)
return sb.String()
}
type HistogramBuckets []*HistogramBucket
func (s HistogramBuckets) Equal(o HistogramBuckets) bool {
if len(s) != len(o) {
return false
}
for i, bucket := range s {
if !bucket.Equal(o[i]) {
return false
}
}
return true
}
type SampleHistogram struct {
Count FloatString `json:"count"`
Sum FloatString `json:"sum"`
Buckets HistogramBuckets `json:"buckets"`
}
func (s SampleHistogram) String() string {
return fmt.Sprintf("Count: %f, Sum: %f, Buckets: %v", s.Count, s.Sum, s.Buckets)
}
func (s *SampleHistogram) Equal(o *SampleHistogram) bool {
return s == o || (s.Count == o.Count && s.Sum == o.Sum && s.Buckets.Equal(o.Buckets))
}
type SampleHistogramPair struct {
Timestamp Time
// Histogram should never be nil, it's only stored as pointer for efficiency.
Histogram *SampleHistogram
}
func (s SampleHistogramPair) MarshalJSON() ([]byte, error) {
if s.Histogram == nil {
return nil, errors.New("histogram is nil")
}
t, err := json.Marshal(s.Timestamp)
if err != nil {
return nil, err
}
v, err := json.Marshal(s.Histogram)
if err != nil {
return nil, err
}
return []byte(fmt.Sprintf("[%s,%s]", t, v)), nil
}
func (s *SampleHistogramPair) UnmarshalJSON(buf []byte) error {
tmp := []interface{}{&s.Timestamp, &s.Histogram}
wantLen := len(tmp)
if err := json.Unmarshal(buf, &tmp); err != nil {
return err
}
if gotLen := len(tmp); gotLen != wantLen {
return fmt.Errorf("wrong number of fields: %d != %d", gotLen, wantLen)
}
if s.Histogram == nil {
return errors.New("histogram is null")
}
return nil
}
func (s SampleHistogramPair) String() string {
return fmt.Sprintf("%s @[%s]", s.Histogram, s.Timestamp)
}
func (s *SampleHistogramPair) Equal(o *SampleHistogramPair) bool {
return s == o || (s.Histogram.Equal(o.Histogram) && s.Timestamp.Equal(o.Timestamp))
}
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