/usr/share/gocode/src/github.com/prometheus/common/expfmt/json_decode.go is in golang-github-prometheus-common-dev 0+git20160104.0a3005b-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | // 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 expfmt
import (
"encoding/json"
"fmt"
"io"
"sort"
"github.com/golang/protobuf/proto"
dto "github.com/prometheus/common/client_model"
"github.com/prometheus/common/model"
)
type json2Decoder struct {
dec *json.Decoder
fams []*dto.MetricFamily
}
func newJSON2Decoder(r io.Reader) Decoder {
return &json2Decoder{
dec: json.NewDecoder(r),
}
}
type histogram002 struct {
Labels model.LabelSet `json:"labels"`
Values map[string]float64 `json:"value"`
}
type counter002 struct {
Labels model.LabelSet `json:"labels"`
Value float64 `json:"value"`
}
func protoLabelSet(base, ext model.LabelSet) ([]*dto.LabelPair, error) {
labels := base.Clone().Merge(ext)
delete(labels, model.MetricNameLabel)
names := make([]string, 0, len(labels))
for ln := range labels {
names = append(names, string(ln))
}
sort.Strings(names)
pairs := make([]*dto.LabelPair, 0, len(labels))
for _, ln := range names {
if !model.LabelNameRE.MatchString(ln) {
return nil, fmt.Errorf("invalid label name %q", ln)
}
lv := labels[model.LabelName(ln)]
pairs = append(pairs, &dto.LabelPair{
Name: proto.String(ln),
Value: proto.String(string(lv)),
})
}
return pairs, nil
}
func (d *json2Decoder) more() error {
var entities []struct {
BaseLabels model.LabelSet `json:"baseLabels"`
Docstring string `json:"docstring"`
Metric struct {
Type string `json:"type"`
Values json.RawMessage `json:"value"`
} `json:"metric"`
}
if err := d.dec.Decode(&entities); err != nil {
return err
}
for _, e := range entities {
f := &dto.MetricFamily{
Name: proto.String(string(e.BaseLabels[model.MetricNameLabel])),
Help: proto.String(e.Docstring),
Type: dto.MetricType_UNTYPED.Enum(),
Metric: []*dto.Metric{},
}
d.fams = append(d.fams, f)
switch e.Metric.Type {
case "counter", "gauge":
var values []counter002
if err := json.Unmarshal(e.Metric.Values, &values); err != nil {
return fmt.Errorf("could not extract %s value: %s", e.Metric.Type, err)
}
for _, ctr := range values {
labels, err := protoLabelSet(e.BaseLabels, ctr.Labels)
if err != nil {
return err
}
f.Metric = append(f.Metric, &dto.Metric{
Label: labels,
Untyped: &dto.Untyped{
Value: proto.Float64(ctr.Value),
},
})
}
case "histogram":
var values []histogram002
if err := json.Unmarshal(e.Metric.Values, &values); err != nil {
return fmt.Errorf("could not extract %s value: %s", e.Metric.Type, err)
}
for _, hist := range values {
quants := make([]string, 0, len(values))
for q := range hist.Values {
quants = append(quants, q)
}
sort.Strings(quants)
for _, q := range quants {
value := hist.Values[q]
// The correct label is "quantile" but to not break old expressions
// this remains "percentile"
hist.Labels["percentile"] = model.LabelValue(q)
labels, err := protoLabelSet(e.BaseLabels, hist.Labels)
if err != nil {
return err
}
f.Metric = append(f.Metric, &dto.Metric{
Label: labels,
Untyped: &dto.Untyped{
Value: proto.Float64(value),
},
})
}
}
default:
return fmt.Errorf("unknown metric type %q", e.Metric.Type)
}
}
return nil
}
// Decode implements the Decoder interface.
func (d *json2Decoder) Decode(v *dto.MetricFamily) error {
if len(d.fams) == 0 {
if err := d.more(); err != nil {
return err
}
}
*v = *d.fams[0]
d.fams = d.fams[1:]
return nil
}
|