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3d78564d2f
* Prom exporter structure * update prometheus exporter with master and add example. * remove distributedcontext from prometheus example * docs and interface checker * make precommit * make precommit & remove "OnRegisterError" * coerce values to float * return register errors and maybe fix precommit? * add option to specify a prometheus.Registry * make exporter implement http.Handler interface * fix map keys bugs * remove unused const * fix modules dependencies. * add support for histogram * get metrics with labels values only instead of a labels map * make exporter implements label encoder interface * encode labels if the encoder is different. * split metrics on several files and encapsulate them in structs * make pre commit * unexport 'sanitize' * remove 'AllValues' in favor of 'Points' and change to 'NewDefaultLabelEncoder' * add prometheus tests * remove newlines on struct declaration * formatting * rewording * imports * add todo on labelValues * blame myself for todo (: * add todos on sanitize * add support for summaries. custom remove label encoder. * imports * imports * update with upstream
95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
// Copyright 2019, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package prometheus
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import (
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"github.com/prometheus/client_golang/prometheus"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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"go.opentelemetry.io/otel/sdk/export/metric/aggregator"
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)
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type gauges struct {
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registerer prometheus.Registerer
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gauges map[metricKey]prometheus.Gauge
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gaugeVecs map[*export.Descriptor]*prometheus.GaugeVec
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}
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func newGauges(registerer prometheus.Registerer) gauges {
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return gauges{
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registerer: registerer,
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gauges: make(map[metricKey]prometheus.Gauge),
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gaugeVecs: make(map[*export.Descriptor]*prometheus.GaugeVec),
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}
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}
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func (ga *gauges) export(gauge aggregator.LastValue, record export.Record, mKey metricKey) error {
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lv, _, err := gauge.LastValue()
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if err != nil {
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return err
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}
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g, err := ga.getGauge(record, mKey)
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if err != nil {
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return err
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}
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desc := record.Descriptor()
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g.Set(lv.CoerceToFloat64(desc.NumberKind()))
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return nil
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}
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func (ga *gauges) getGauge(record export.Record, mKey metricKey) (prometheus.Gauge, error) {
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if c, ok := ga.gauges[mKey]; ok {
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return c, nil
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}
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desc := record.Descriptor()
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gaugeVec, err := ga.getGaugeVec(desc, record.Labels())
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if err != nil {
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return nil, err
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}
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gauge, err := gaugeVec.GetMetricWithLabelValues(labelValues(record.Labels())...)
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if err != nil {
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return nil, err
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}
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ga.gauges[mKey] = gauge
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return gauge, nil
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}
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func (ga *gauges) getGaugeVec(desc *export.Descriptor, labels export.Labels) (*prometheus.GaugeVec, error) {
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if gv, ok := ga.gaugeVecs[desc]; ok {
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return gv, nil
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}
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g := prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: sanitize(desc.Name()),
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Help: desc.Description(),
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},
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labelsKeys(labels.Ordered()),
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)
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if err := ga.registerer.Register(g); err != nil {
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return nil, err
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}
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ga.gaugeVecs[desc] = g
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return g, nil
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}
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