@opentelemetry/sdk-metrics
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116 lines • 5.51 kB
JavaScript
/*
* 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 { createInstrumentDescriptorWithView, } from '../InstrumentDescriptor';
import { Meter } from '../Meter';
import { isNotNullish } from '../utils';
import { AsyncMetricStorage } from './AsyncMetricStorage';
import { MetricStorageRegistry } from './MetricStorageRegistry';
import { MultiMetricStorage } from './MultiWritableMetricStorage';
import { ObservableRegistry } from './ObservableRegistry';
import { SyncMetricStorage } from './SyncMetricStorage';
import { createNoopAttributesProcessor, } from '../view/AttributesProcessor';
/**
* An internal record for shared meter provider states.
*/
export class MeterSharedState {
_meterProviderSharedState;
_instrumentationScope;
metricStorageRegistry = new MetricStorageRegistry();
observableRegistry = new ObservableRegistry();
meter;
constructor(_meterProviderSharedState, _instrumentationScope) {
this._meterProviderSharedState = _meterProviderSharedState;
this._instrumentationScope = _instrumentationScope;
this.meter = new Meter(this);
}
registerMetricStorage(descriptor) {
const storages = this._registerMetricStorage(descriptor, SyncMetricStorage);
if (storages.length === 1) {
return storages[0];
}
return new MultiMetricStorage(storages);
}
registerAsyncMetricStorage(descriptor) {
const storages = this._registerMetricStorage(descriptor, AsyncMetricStorage);
return storages;
}
/**
* @param collector opaque handle of {@link MetricCollector} which initiated the collection.
* @param collectionTime the HrTime at which the collection was initiated.
* @param options options for collection.
* @returns the list of metric data collected.
*/
async collect(collector, collectionTime, options) {
/**
* 1. Call all observable callbacks first.
* 2. Collect metric result for the collector.
*/
const errors = await this.observableRegistry.observe(collectionTime, options?.timeoutMillis);
const storages = this.metricStorageRegistry.getStorages(collector);
// prevent more allocations if there are no storages.
if (storages.length === 0) {
return null;
}
const metricDataList = storages
.map(metricStorage => {
return metricStorage.collect(collector, collectionTime);
})
.filter(isNotNullish);
// skip this scope if no data was collected (storage created, but no data observed)
if (metricDataList.length === 0) {
return { errors };
}
return {
scopeMetrics: {
scope: this._instrumentationScope,
metrics: metricDataList,
},
errors,
};
}
_registerMetricStorage(descriptor, MetricStorageType) {
const views = this._meterProviderSharedState.viewRegistry.findViews(descriptor, this._instrumentationScope);
let storages = views.map(view => {
const viewDescriptor = createInstrumentDescriptorWithView(view, descriptor);
const compatibleStorage = this.metricStorageRegistry.findOrUpdateCompatibleStorage(viewDescriptor);
if (compatibleStorage != null) {
return compatibleStorage;
}
const aggregator = view.aggregation.createAggregator(viewDescriptor);
const viewStorage = new MetricStorageType(viewDescriptor, aggregator, view.attributesProcessor, this._meterProviderSharedState.metricCollectors, view.aggregationCardinalityLimit);
this.metricStorageRegistry.register(viewStorage);
return viewStorage;
});
// Fallback to the per-collector aggregations if no view is configured for the instrument.
if (storages.length === 0) {
const perCollectorAggregations = this._meterProviderSharedState.selectAggregations(descriptor.type);
const collectorStorages = perCollectorAggregations.map(([collector, aggregation]) => {
const compatibleStorage = this.metricStorageRegistry.findOrUpdateCompatibleCollectorStorage(collector, descriptor);
if (compatibleStorage != null) {
return compatibleStorage;
}
const aggregator = aggregation.createAggregator(descriptor);
const cardinalityLimit = collector.selectCardinalityLimit(descriptor.type);
const storage = new MetricStorageType(descriptor, aggregator, createNoopAttributesProcessor(), [collector], cardinalityLimit);
this.metricStorageRegistry.registerForCollector(collector, storage);
return storage;
});
storages = storages.concat(collectorStorages);
}
return storages;
}
}
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