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- // Copyright 2014 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 prometheus
-
- import (
- "encoding/json"
- "expvar"
- )
-
- type expvarCollector struct {
- exports map[string]*Desc
- }
-
- // NewExpvarCollector is the obsolete version of collectors.NewExpvarCollector.
- // See there for documentation.
- //
- // Deprecated: Use collectors.NewExpvarCollector instead.
- func NewExpvarCollector(exports map[string]*Desc) Collector {
- return &expvarCollector{
- exports: exports,
- }
- }
-
- // Describe implements Collector.
- func (e *expvarCollector) Describe(ch chan<- *Desc) {
- for _, desc := range e.exports {
- ch <- desc
- }
- }
-
- // Collect implements Collector.
- func (e *expvarCollector) Collect(ch chan<- Metric) {
- for name, desc := range e.exports {
- var m Metric
- expVar := expvar.Get(name)
- if expVar == nil {
- continue
- }
- var v interface{}
- labels := make([]string, len(desc.variableLabels))
- if err := json.Unmarshal([]byte(expVar.String()), &v); err != nil {
- ch <- NewInvalidMetric(desc, err)
- continue
- }
- var processValue func(v interface{}, i int)
- processValue = func(v interface{}, i int) {
- if i >= len(labels) {
- copiedLabels := append(make([]string, 0, len(labels)), labels...)
- switch v := v.(type) {
- case float64:
- m = MustNewConstMetric(desc, UntypedValue, v, copiedLabels...)
- case bool:
- if v {
- m = MustNewConstMetric(desc, UntypedValue, 1, copiedLabels...)
- } else {
- m = MustNewConstMetric(desc, UntypedValue, 0, copiedLabels...)
- }
- default:
- return
- }
- ch <- m
- return
- }
- vm, ok := v.(map[string]interface{})
- if !ok {
- return
- }
- for lv, val := range vm {
- labels[i] = lv
- processValue(val, i+1)
- }
- }
- processValue(v, 0)
- }
- }
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