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* Copyright The OpenTelemetry Authors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n context,\n diag,\n propagation,\n TextMapPropagator,\n trace,\n TracerProvider,\n} from '@opentelemetry/api';\nimport {\n CompositePropagator,\n W3CBaggagePropagator,\n W3CTraceContextPropagator,\n getEnv,\n merge,\n} from '@opentelemetry/core';\nimport { IResource, Resource } from '@opentelemetry/resources';\nimport { SpanProcessor, Tracer } from '.';\nimport { loadDefaultConfig } from './config';\nimport { MultiSpanProcessor } from './MultiSpanProcessor';\nimport { NoopSpanProcessor } from './export/NoopSpanProcessor';\nimport { SDKRegistrationConfig, TracerConfig } from './types';\nimport { SpanExporter } from './export/SpanExporter';\nimport { BatchSpanProcessor } from './platform';\nimport { reconfigureLimits } from './utility';\n\nexport type PROPAGATOR_FACTORY = () => TextMapPropagator;\nexport type EXPORTER_FACTORY = () => SpanExporter;\n\nexport enum ForceFlushState {\n 'resolved',\n 'timeout',\n 'error',\n 'unresolved',\n}\n\n/**\n * This class represents a basic tracer provider which platform libraries can extend\n */\nexport class BasicTracerProvider implements TracerProvider {\n protected static readonly _registeredPropagators = new Map<\n string,\n PROPAGATOR_FACTORY\n >([\n ['tracecontext', () => new W3CTraceContextPropagator()],\n ['baggage', () => new W3CBaggagePropagator()],\n ]);\n\n protected static readonly _registeredExporters = new Map<\n string,\n EXPORTER_FACTORY\n >();\n\n private readonly _config: TracerConfig;\n private readonly _registeredSpanProcessors: SpanProcessor[] = [];\n private readonly _tracers: Map<string, Tracer> = new Map();\n\n activeSpanProcessor: SpanProcessor;\n readonly resource: IResource;\n\n constructor(config: TracerConfig = {}) {\n const mergedConfig = merge(\n {},\n loadDefaultConfig(),\n reconfigureLimits(config)\n );\n this.resource = mergedConfig.resource ?? Resource.empty();\n this.resource = Resource.default().merge(this.resource);\n this._config = Object.assign({}, mergedConfig, {\n resource: this.resource,\n });\n\n const defaultExporter = this._buildExporterFromEnv();\n if (defaultExporter !== undefined) {\n const batchProcessor = new BatchSpanProcessor(defaultExporter);\n this.activeSpanProcessor = batchProcessor;\n } else {\n this.activeSpanProcessor = new NoopSpanProcessor();\n }\n }\n\n getTracer(\n name: string,\n version?: string,\n options?: { schemaUrl?: string }\n ): Tracer {\n const key = `${name}@${version || ''}:${options?.schemaUrl || ''}`;\n if (!this._tracers.has(key)) {\n this._tracers.set(\n key,\n new Tracer(\n { name, version, schemaUrl: options?.schemaUrl },\n this._config,\n this\n )\n );\n }\n\n // eslint-disable-next-line @typescript-eslint/no-non-null-assertion\n return this._tracers.get(key)!;\n }\n\n /**\n * Adds a new {@link SpanProcessor} to this tracer.\n * @param spanProcessor the new SpanProcessor to be added.\n */\n addSpanProcessor(spanProcessor: SpanProcessor): void {\n if (this._registeredSpanProcessors.length === 0) {\n // since we might have enabled by default a batchProcessor, we disable it\n // before adding the new one\n this.activeSpanProcessor\n .shutdown()\n .catch(err =>\n diag.error(\n 'Error while trying to shutdown current span processor',\n err\n )\n );\n }\n this._registeredSpanProcessors.push(spanProcessor);\n this.activeSpanProcessor = new MultiSpanProcessor(\n this._registeredSpanProcessors\n );\n }\n\n getActiveSpanProcessor(): SpanProcessor {\n return this.activeSpanProcessor;\n }\n\n /**\n * Register this TracerProvider for use with the OpenTelemetry API.\n * Undefined values may be replaced with defaults, and\n * null values will be skipped.\n *\n * @param config Configuration object for SDK registration\n */\n register(config: SDKRegistrationConfig = {}): void {\n trace.setGlobalTracerProvider(this);\n if (config.propagator === undefined) {\n config.propagator = this._buildPropagatorFromEnv();\n }\n\n if (config.contextManager) {\n context.setGlobalContextManager(config.contextManager);\n }\n\n if (config.propagator) {\n propagation.setGlobalPropagator(config.propagator);\n }\n }\n\n forceFlush(): Promise<void> {\n const timeout = this._config.forceFlushTimeoutMillis;\n const promises = this._registeredSpanProcessors.map(\n (spanProcessor: SpanProcessor) => {\n return new Promise(resolve => {\n let state: ForceFlushState;\n const timeoutInterval = setTimeout(() => {\n resolve(\n new Error(\n `Span processor did not completed within timeout period of ${timeout} ms`\n )\n );\n state = ForceFlushState.timeout;\n }, timeout);\n\n spanProcessor\n .forceFlush()\n .then(() => {\n clearTimeout(timeoutInterval);\n if (state !== ForceFlushState.timeout) {\n state = ForceFlushState.resolved;\n resolve(state);\n }\n })\n .catch(error => {\n clearTimeout(timeoutInterval);\n state = ForceFlushState.error;\n resolve(error);\n });\n });\n }\n );\n\n return new Promise<void>((resolve, reject) => {\n Promise.all(promises)\n .then(results => {\n const errors = results.filter(\n result => result !== ForceFlushState.resolved\n );\n if (errors.length > 0) {\n reject(errors);\n } else {\n resolve();\n }\n })\n .catch(error => reject([error]));\n });\n }\n\n shutdown(): Promise<void> {\n return this.activeSpanProcessor.shutdown();\n }\n\n /**\n * TS cannot yet infer the type of this.constructor:\n * https://github.com/Microsoft/TypeScript/issues/3841#issuecomment-337560146\n * There is no need to override either of the getters in your child class.\n * The type of the registered component maps should be the same across all\n * classes in the inheritance tree.\n */\n protected _getPropagator(name: string): TextMapPropagator | undefined {\n return (\n this.constructor as typeof BasicTracerProvider\n )._registeredPropagators.get(name)?.();\n }\n\n protected _getSpanExporter(name: string): SpanExporter | undefined {\n return (\n this.constructor as typeof BasicTracerProvider\n )._registeredExporters.get(name)?.();\n }\n\n protected _buildPropagatorFromEnv(): TextMapPropagator | undefined {\n // per spec, propagators from env must be deduplicated\n const uniquePropagatorNames = Array.from(\n new Set(getEnv().OTEL_PROPAGATORS)\n );\n\n const propagators = uniquePropagatorNames.map(name => {\n const propagator = this._getPropagator(name);\n if (!propagator) {\n diag.warn(\n `Propagator \"${name}\" requested through environment variable is unavailable.`\n );\n }\n\n return propagator;\n });\n const validPropagators = propagators.reduce<TextMapPropagator[]>(\n (list, item) => {\n if (item) {\n list.push(item);\n }\n return list;\n },\n []\n );\n\n if (validPropagators.length === 0) {\n return;\n } else if (uniquePropagatorNames.length === 1) {\n return validPropagators[0];\n } else {\n return new CompositePropagator({\n propagators: validPropagators,\n });\n }\n }\n\n protected _buildExporterFromEnv(): SpanExporter 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