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104 changes: 104 additions & 0 deletions
104
experimental/packages/shim-opencensus/src/OpenCensusMetricProducer.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * Copyright 2018, OpenCensus Authors | ||
| * Copyright The OpenTelemetry 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
|
|
||
| import * as oc from '@opencensus/core'; | ||
| import { Resource } from '@opentelemetry/resources'; | ||
| import { | ||
| CollectionResult, | ||
| MetricData, | ||
| MetricProducer, | ||
| ScopeMetrics, | ||
| } from '@opentelemetry/sdk-metrics'; | ||
| import { mapOcMetric } from './metric-transform'; | ||
| import { VERSION } from './version'; | ||
|
|
||
| const SCOPE = { | ||
| name: '@opentelemetry/shim-opencensus', | ||
| version: VERSION, | ||
| } as const; | ||
|
|
||
| interface OpenCensusMetricProducerOptions { | ||
| /** | ||
| * An instance of OpenCensus MetricProducerManager. If not provided, | ||
| * `oc.Metrics.getMetricProducerManager()` will be used. | ||
| */ | ||
| openCensusMetricProducerManager?: oc.MetricProducerManager; | ||
| } | ||
|
|
||
| /** | ||
| * A {@link MetricProducer} which collects metrics from OpenCensus. Provide an instance to your | ||
| * {@link MetricReader} when you create it to include all OpenCensus metrics in the collection | ||
| * result: | ||
| * | ||
| * @example | ||
| * ``` | ||
| * const meterProvider = new MeterProvider(); | ||
| * const reader = new PeriodicExportingMetricReader({ | ||
| * metricProducers: [new OpenCensusMetricProducer()], | ||
| * exporter: exporter, | ||
| * }); | ||
| * meterProvider.addMetricReader(reader); | ||
| * ``` | ||
| */ | ||
| export class OpenCensusMetricProducer implements MetricProducer { | ||
| private _openCensusMetricProducerManager: oc.MetricProducerManager; | ||
|
|
||
| constructor(options?: OpenCensusMetricProducerOptions) { | ||
| this._openCensusMetricProducerManager = | ||
| options?.openCensusMetricProducerManager ?? | ||
| oc.Metrics.getMetricProducerManager(); | ||
| } | ||
|
|
||
| async collect(): Promise<CollectionResult> { | ||
| const metrics = await this._collectOpenCensus(); | ||
| const scopeMetrics: ScopeMetrics[] = | ||
| metrics.length === 0 | ||
| ? [] | ||
| : [ | ||
| { | ||
| scope: SCOPE, | ||
| metrics, | ||
| }, | ||
| ]; | ||
|
|
||
| return { | ||
| errors: [], | ||
| resourceMetrics: { | ||
| // Resource is ignored by the SDK, it just uses the SDK's resource | ||
| resource: Resource.EMPTY, | ||
| scopeMetrics, | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| private async _collectOpenCensus(): Promise<MetricData[]> { | ||
| const metrics: MetricData[] = []; | ||
|
|
||
| // The use of oc.Metrics.getMetricProducerManager() was adapted from | ||
| // https://github.com/census-instrumentation/opencensus-node/blob/d46c8891b15783803d724b717db9a8c22cb73d6a/packages/opencensus-exporter-stackdriver/src/stackdriver-monitoring.ts#L122 | ||
| for (const metricProducer of this._openCensusMetricProducerManager.getAllMetricProducer()) { | ||
| for (const metric of metricProducer.getMetrics()) { | ||
| const metricData = mapOcMetric(metric); | ||
| if (metricData !== null) { | ||
| metrics.push(metricData); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return metrics; | ||
| } | ||
| } |
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