Marc Mintel
5397309103
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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 * as api from '@opentelemetry/api';\nimport {\n InstrumentationScope,\n sanitizeAttributes,\n isTracingSuppressed,\n} from '@opentelemetry/core';\nimport { SpanImpl } from './Span';\nimport { GeneralLimits, SpanLimits, TracerConfig } from './types';\nimport { mergeConfig } from './utility';\nimport { SpanProcessor } from './SpanProcessor';\nimport { Sampler } from './Sampler';\nimport { IdGenerator } from './IdGenerator';\nimport { RandomIdGenerator } from './platform';\nimport { Resource } from '@opentelemetry/resources';\n\n/**\n * This class represents a basic tracer.\n */\nexport class Tracer implements api.Tracer {\n private readonly _sampler: Sampler;\n private readonly _generalLimits: GeneralLimits;\n private readonly _spanLimits: SpanLimits;\n private readonly _idGenerator: IdGenerator;\n readonly instrumentationScope: InstrumentationScope;\n\n private readonly _resource: Resource;\n private readonly _spanProcessor: SpanProcessor;\n\n /**\n * Constructs a new Tracer instance.\n */\n constructor(\n instrumentationScope: InstrumentationScope,\n config: TracerConfig,\n resource: Resource,\n spanProcessor: SpanProcessor\n ) {\n const localConfig = mergeConfig(config);\n this._sampler = localConfig.sampler;\n this._generalLimits = localConfig.generalLimits;\n this._spanLimits = localConfig.spanLimits;\n this._idGenerator = config.idGenerator || new RandomIdGenerator();\n this._resource = resource;\n this._spanProcessor = spanProcessor;\n this.instrumentationScope = instrumentationScope;\n }\n\n /**\n * Starts a new Span or returns the default NoopSpan based on the sampling\n * decision.\n */\n startSpan(\n name: string,\n options: api.SpanOptions = {},\n context = api.context.active()\n ): api.Span {\n // remove span from context in case a root span is requested via options\n if (options.root) {\n context = api.trace.deleteSpan(context);\n }\n const parentSpan = api.trace.getSpan(context);\n\n if (isTracingSuppressed(context)) {\n api.diag.debug('Instrumentation suppressed, returning Noop Span');\n const nonRecordingSpan = api.trace.wrapSpanContext(\n api.INVALID_SPAN_CONTEXT\n );\n return nonRecordingSpan;\n }\n\n const parentSpanContext = parentSpan?.spanContext();\n const spanId = this._idGenerator.generateSpanId();\n let validParentSpanContext;\n let traceId;\n let traceState;\n if (\n !parentSpanContext ||\n !api.trace.isSpanContextValid(parentSpanContext)\n ) {\n // New root span.\n traceId = this._idGenerator.generateTraceId();\n } else {\n // New child span.\n traceId = parentSpanContext.traceId;\n traceState = parentSpanContext.traceState;\n validParentSpanContext = parentSpanContext;\n }\n\n const spanKind = options.kind ?? api.SpanKind.INTERNAL;\n const links = (options.links ?? []).map(link => {\n return {\n context: link.context,\n attributes: sanitizeAttributes(link.attributes),\n };\n });\n const attributes = sanitizeAttributes(options.attributes);\n // make sampling decision\n const samplingResult = this._sampler.shouldSample(\n context,\n traceId,\n name,\n spanKind,\n attributes,\n links\n );\n\n traceState = samplingResult.traceState ?? traceState;\n\n const traceFlags =\n samplingResult.decision === api.SamplingDecision.RECORD_AND_SAMPLED\n ? api.TraceFlags.SAMPLED\n : api.TraceFlags.NONE;\n const spanContext = { traceId, spanId, traceFlags, traceState };\n if (samplingResult.decision === api.SamplingDecision.NOT_RECORD) {\n api.diag.debug(\n 'Recording is off, propagating context in a non-recording span'\n );\n const nonRecordingSpan = api.trace.wrapSpanContext(spanContext);\n return nonRecordingSpan;\n }\n\n // Set initial span attributes. The attributes object may have been mutated\n // by the sampler, so we sanitize the merged attributes before setting them.\n const initAttributes = sanitizeAttributes(\n Object.assign(attributes, samplingResult.attributes)\n );\n\n const span = new SpanImpl({\n resource: this._resource,\n scope: this.instrumentationScope,\n context,\n spanContext,\n name,\n kind: spanKind,\n links,\n parentSpanContext: validParentSpanContext,\n attributes: initAttributes,\n startTime: options.startTime,\n spanProcessor: this._spanProcessor,\n spanLimits: this._spanLimits,\n });\n return span;\n }\n\n /**\n * Starts a new {@link Span} and calls the given function passing it the\n * created span as first argument.\n * Additionally the new span gets set in context and this context is activated\n * for the duration of the function call.\n *\n * @param name The name of the span\n * @param [options] SpanOptions used for span creation\n * @param [context] Context to use to extract parent\n * @param fn function called in the context of the span and receives the newly created span as an argument\n * @returns return value of fn\n * @example\n * const something = tracer.startActiveSpan('op', span => {\n * try {\n * do some work\n * span.setStatus({code: SpanStatusCode.OK});\n * return something;\n * } catch (err) {\n * span.setStatus({\n * code: SpanStatusCode.ERROR,\n * message: err.message,\n * });\n * throw err;\n * } finally {\n * span.end();\n * }\n * });\n * @example\n * const span = tracer.startActiveSpan('op', span => {\n * try {\n * do some work\n * return span;\n * } catch (err) {\n * span.setStatus({\n * code: SpanStatusCode.ERROR,\n * message: err.message,\n * });\n * throw err;\n * }\n * });\n * do some more work\n * span.end();\n */\n startActiveSpan<F extends (span: api.Span) => ReturnType<F>>(\n name: string,\n fn: F\n ): ReturnType<F>;\n startActiveSpan<F extends (span: api.Span) => ReturnType<F>>(\n name: string,\n opts: api.SpanOptions,\n fn: F\n ): ReturnType<F>;\n startActiveSpan<F extends (span: api.Span) => ReturnType<F>>(\n name: string,\n opts: api.SpanOptions,\n ctx: api.Context,\n fn: F\n ): ReturnType<F>;\n startActiveSpan<F extends (span: api.Span) => ReturnType<F>>(\n name: string,\n arg2?: F | api.SpanOptions,\n arg3?: F | api.Context,\n arg4?: F\n ): ReturnType<F> | undefined {\n let opts: api.SpanOptions | undefined;\n let ctx: api.Context | undefined;\n let fn: F;\n\n if (arguments.length < 2) {\n return;\n } else if (arguments.length === 2) {\n fn = arg2 as F;\n } else if (arguments.length === 3) {\n opts = arg2 as api.SpanOptions | undefined;\n fn = arg3 as F;\n } else {\n opts = arg2 as api.SpanOptions | undefined;\n ctx = arg3 as api.Context | undefined;\n fn = arg4 as F;\n }\n\n const parentContext = ctx ?? api.context.active();\n const span = this.startSpan(name, opts, parentContext);\n const contextWithSpanSet = api.trace.setSpan(parentContext, span);\n\n return api.context.with(contextWithSpanSet, fn, undefined, span);\n }\n\n /** Returns the active {@link GeneralLimits}. */\n getGeneralLimits(): GeneralLimits {\n return this._generalLimits;\n }\n\n /** Returns the active {@link SpanLimits}. */\n getSpanLimits(): SpanLimits {\n return this._spanLimits;\n }\n}\n"]} |