@opentelemetry/sdk-trace-base
Version:
65 lines • 3.18 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 { isSpanContextValid, TraceFlags, trace, } from '@opentelemetry/api';
import { globalErrorHandler } from '@opentelemetry/core';
import { AlwaysOffSampler } from './AlwaysOffSampler';
import { AlwaysOnSampler } from './AlwaysOnSampler';
/**
* A composite sampler that either respects the parent span's sampling decision
* or delegates to `delegateSampler` for root spans.
*/
export class ParentBasedSampler {
_root;
_remoteParentSampled;
_remoteParentNotSampled;
_localParentSampled;
_localParentNotSampled;
constructor(config) {
this._root = config.root;
if (!this._root) {
globalErrorHandler(new Error('ParentBasedSampler must have a root sampler configured'));
this._root = new AlwaysOnSampler();
}
this._remoteParentSampled =
config.remoteParentSampled ?? new AlwaysOnSampler();
this._remoteParentNotSampled =
config.remoteParentNotSampled ?? new AlwaysOffSampler();
this._localParentSampled =
config.localParentSampled ?? new AlwaysOnSampler();
this._localParentNotSampled =
config.localParentNotSampled ?? new AlwaysOffSampler();
}
shouldSample(context, traceId, spanName, spanKind, attributes, links) {
const parentContext = trace.getSpanContext(context);
if (!parentContext || !isSpanContextValid(parentContext)) {
return this._root.shouldSample(context, traceId, spanName, spanKind, attributes, links);
}
if (parentContext.isRemote) {
if (parentContext.traceFlags & TraceFlags.SAMPLED) {
return this._remoteParentSampled.shouldSample(context, traceId, spanName, spanKind, attributes, links);
}
return this._remoteParentNotSampled.shouldSample(context, traceId, spanName, spanKind, attributes, links);
}
if (parentContext.traceFlags & TraceFlags.SAMPLED) {
return this._localParentSampled.shouldSample(context, traceId, spanName, spanKind, attributes, links);
}
return this._localParentNotSampled.shouldSample(context, traceId, spanName, spanKind, attributes, links);
}
toString() {
return `ParentBased{root=${this._root.toString()}, remoteParentSampled=${this._remoteParentSampled.toString()}, remoteParentNotSampled=${this._remoteParentNotSampled.toString()}, localParentSampled=${this._localParentSampled.toString()}, localParentNotSampled=${this._localParentNotSampled.toString()}}`;
}
}
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