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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
2.4 KiB
Go
95 lines
2.4 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 counters struct {
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registerer prometheus.Registerer
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counters map[metricKey]prometheus.Counter
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counterVecs map[*export.Descriptor]*prometheus.CounterVec
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}
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func newCounters(registerer prometheus.Registerer) counters {
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return counters{
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registerer: registerer,
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counters: make(map[metricKey]prometheus.Counter),
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counterVecs: make(map[*export.Descriptor]*prometheus.CounterVec),
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}
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}
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func (co *counters) export(sum aggregator.Sum, record export.Record, mKey metricKey) error {
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value, err := sum.Sum()
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if err != nil {
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return err
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}
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c, err := co.getCounter(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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c.Add(value.CoerceToFloat64(desc.NumberKind()))
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return nil
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}
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func (co *counters) getCounter(record export.Record, mKey metricKey) (prometheus.Counter, error) {
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if c, ok := co.counters[mKey]; ok {
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return c, nil
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}
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desc := record.Descriptor()
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counterVec, err := co.getCounterVec(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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counter, err := counterVec.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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co.counters[mKey] = counter
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return counter, nil
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}
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func (co *counters) getCounterVec(desc *export.Descriptor, labels export.Labels) (*prometheus.CounterVec, error) {
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if c, ok := co.counterVecs[desc]; ok {
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return c, nil
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}
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c := prometheus.NewCounterVec(
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prometheus.CounterOpts{
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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 := co.registerer.Register(c); err != nil {
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return nil, err
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}
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co.counterVecs[desc] = c
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return c, nil
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}
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