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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/utils/telemetry</a> instrumentation.ts</h1>
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<span class="strong">3.4% </span>
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<span class='fraction'>6/176</span>
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<span class="strong">3.4% </span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* @fileoverview OpenTelemetry SDK initialization and lifecycle management.
* Provides runtime-aware initialization with graceful degradation for Worker/Edge environments.
* Supports both Node.js (full NodeSDK) and serverless runtimes (lightweight telemetry).
* @module src/utils/telemetry/instrumentation
*/
import { config } from '@/config/index.js';
import { DiagConsoleLogger, DiagLogLevel, diag } from '@opentelemetry/api';
import type { NodeSDK } from '@opentelemetry/sdk-node';
import { runtimeCaps } from '@/utils/internal/runtime.js';
// Node-specific imports are lazy-loaded to avoid Worker crashes
// SDK instance is exported for internal access if needed
export let sdk: NodeSDK | null = null;
// Initialization state management
let isOtelInitialized = false;
let initializationPromise: Promise<void> | null = null;
/**
* Determines if the NodeSDK can be used in the current runtime.
* Returns false in Worker/Edge environments where Node modules are unavailable.
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function canUseNodeSDK(): boolean {</span></span>
<span class="cstat-no" title="statement not covered" > return (</span>
<span class="cstat-no" title="statement not covered" > runtimeCaps.isNode &&</span>
<span class="cstat-no" title="statement not covered" > typeof process?.versions?.node === 'string' &&</span>
<span class="cstat-no" title="statement not covered" > typeof process.env === 'object'</span>
);
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Detects cloud platform and provider for resource attributes.
* Enriches telemetry with deployment environment metadata.
*
* @returns Record of cloud-related resource attributes
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function detectCloudResource(): Record<string, string> {</span></span>
<span class="cstat-no" title="statement not covered" > const attrs: Record<string, string> = {};</span>
// Cloudflare Workers
<span class="cstat-no" title="statement not covered" > if (runtimeCaps.isWorkerLike) {</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.provider'] = 'cloudflare';</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.platform'] = 'cloudflare_workers';</span>
<span class="cstat-no" title="statement not covered" > }</span>
// AWS Lambda
<span class="cstat-no" title="statement not covered" > if (typeof process !== 'undefined' && process.env?.AWS_LAMBDA_FUNCTION_NAME) {</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.provider'] = 'aws';</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.platform'] = 'aws_lambda';</span>
<span class="cstat-no" title="statement not covered" > if (process.env.AWS_REGION) {</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.region'] = process.env.AWS_REGION;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > }</span>
// GCP Cloud Functions/Cloud Run
<span class="cstat-no" title="statement not covered" > if (</span>
<span class="cstat-no" title="statement not covered" > typeof process !== 'undefined' &&</span>
<span class="cstat-no" title="statement not covered" > (process.env?.FUNCTION_TARGET || process.env?.K_SERVICE)</span>
<span class="cstat-no" title="statement not covered" > ) {</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.provider'] = 'gcp';</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.platform'] = process.env.FUNCTION_TARGET</span>
<span class="cstat-no" title="statement not covered" > ? 'gcp_cloud_functions'</span>
<span class="cstat-no" title="statement not covered" > : 'gcp_cloud_run';</span>
<span class="cstat-no" title="statement not covered" > if (process.env.GCP_REGION) {</span>
<span class="cstat-no" title="statement not covered" > attrs['cloud.region'] = process.env.GCP_REGION;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > attrs['deployment.environment.name'] = config.environment;</span>
<span class="cstat-no" title="statement not covered" > return attrs;</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Initializes OpenTelemetry SDK with runtime-appropriate configuration.
* This function is idempotent and safe to call multiple times.
* Completes successfully even if telemetry is disabled or runtime is incompatible.
*
* @returns Promise that resolves when initialization is complete
*
* @example
* ```typescript
* // In application entry point (src/index.ts)
* await initializeOpenTelemetry();
* ```
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >export async function initializeOpenTelemetry(): Promise<void> {</span></span>
// Return existing promise if initialization in progress
<span class="cstat-no" title="statement not covered" > if (initializationPromise) {</span>
<span class="cstat-no" title="statement not covered" > return initializationPromise;</span>
<span class="cstat-no" title="statement not covered" > }</span>
// Already initialized
<span class="cstat-no" title="statement not covered" > if (isOtelInitialized) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > initializationPromise = (async () => {</span>
<span class="cstat-no" title="statement not covered" > if (!config.openTelemetry.enabled) {</span>
<span class="cstat-no" title="statement not covered" > diag.info('OpenTelemetry disabled via configuration.');</span>
<span class="cstat-no" title="statement not covered" > isOtelInitialized = true;</span>
<span class="cstat-no" title="statement not covered" > return;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > if (!canUseNodeSDK()) {</span>
<span class="cstat-no" title="statement not covered" > diag.info(</span>
<span class="cstat-no" title="statement not covered" > 'NodeSDK unavailable in this runtime. Using lightweight telemetry mode.',</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > isOtelInitialized = true;</span>
<span class="cstat-no" title="statement not covered" > return;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > isOtelInitialized = true;</span>
<span class="cstat-no" title="statement not covered" > try {</span>
// Lazy-load Node-specific modules
<span class="cstat-no" title="statement not covered" > const [</span>
<span class="cstat-no" title="statement not covered" > { getNodeAutoInstrumentations },</span>
<span class="cstat-no" title="statement not covered" > { OTLPMetricExporter },</span>
<span class="cstat-no" title="statement not covered" > { OTLPTraceExporter },</span>
<span class="cstat-no" title="statement not covered" > { PinoInstrumentation },</span>
<span class="cstat-no" title="statement not covered" > { resourceFromAttributes },</span>
<span class="cstat-no" title="statement not covered" > { PeriodicExportingMetricReader },</span>
<span class="cstat-no" title="statement not covered" > { NodeSDK },</span>
<span class="cstat-no" title="statement not covered" > { BatchSpanProcessor, TraceIdRatioBasedSampler },</span>
<span class="cstat-no" title="statement not covered" > { ATTR_SERVICE_NAME, ATTR_SERVICE_VERSION },</span>
<span class="cstat-no" title="statement not covered" > ] = await Promise.all([</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/auto-instrumentations-node'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/exporter-metrics-otlp-http'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/exporter-trace-otlp-http'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/instrumentation-pino'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/resources'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/sdk-metrics'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/sdk-node'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/sdk-trace-node'),</span>
<span class="cstat-no" title="statement not covered" > import('@opentelemetry/semantic-conventions/incubating'),</span>
<span class="cstat-no" title="statement not covered" > ]);</span>
<span class="cstat-no" title="statement not covered" > const otelLogLevelString =</span>
<span class="cstat-no" title="statement not covered" > config.openTelemetry.logLevel.toUpperCase() as keyof typeof DiagLogLevel;</span>
<span class="cstat-no" title="statement not covered" > const otelLogLevel =</span>
<span class="cstat-no" title="statement not covered" > DiagLogLevel[otelLogLevelString] ?? DiagLogLevel.INFO;</span>
<span class="cstat-no" title="statement not covered" > diag.setLogger(new DiagConsoleLogger(), otelLogLevel);</span>
<span class="cstat-no" title="statement not covered" > const tracesEndpoint = config.openTelemetry.tracesEndpoint;</span>
<span class="cstat-no" title="statement not covered" > const metricsEndpoint = config.openTelemetry.metricsEndpoint;</span>
<span class="cstat-no" title="statement not covered" > if (!tracesEndpoint && !metricsEndpoint) {</span>
<span class="cstat-no" title="statement not covered" > diag.warn(</span>
<span class="cstat-no" title="statement not covered" > 'OTEL_ENABLED is true, but no OTLP endpoint for traces or metrics is configured. OpenTelemetry will not export any telemetry.',</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > const resource = resourceFromAttributes({</span>
<span class="cstat-no" title="statement not covered" > [ATTR_SERVICE_NAME]: config.openTelemetry.serviceName,</span>
<span class="cstat-no" title="statement not covered" > [ATTR_SERVICE_VERSION]: config.openTelemetry.serviceVersion,</span>
<span class="cstat-no" title="statement not covered" > ...detectCloudResource(),</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > const spanProcessors: InstanceType<typeof BatchSpanProcessor>[] = [];</span>
<span class="cstat-no" title="statement not covered" > if (tracesEndpoint) {</span>
<span class="cstat-no" title="statement not covered" > diag.info(</span>
<span class="cstat-no" title="statement not covered" > `Using OTLP exporter for traces, endpoint: ${tracesEndpoint}`,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > const traceExporter = new OTLPTraceExporter({ url: tracesEndpoint });</span>
<span class="cstat-no" title="statement not covered" > spanProcessors.push(new BatchSpanProcessor(traceExporter));</span>
<span class="cstat-no" title="statement not covered" > } else {</span>
<span class="cstat-no" title="statement not covered" > diag.info(</span>
<span class="cstat-no" title="statement not covered" > 'No OTLP traces endpoint configured. Traces will not be exported.',</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > const metricReader = metricsEndpoint</span>
<span class="cstat-no" title="statement not covered" > ? new PeriodicExportingMetricReader({</span>
<span class="cstat-no" title="statement not covered" > exporter: new OTLPMetricExporter({ url: metricsEndpoint }),</span>
<span class="cstat-no" title="statement not covered" > exportIntervalMillis: 15000,</span>
<span class="cstat-no" title="statement not covered" > })</span>
<span class="cstat-no" title="statement not covered" > : undefined;</span>
<span class="cstat-no" title="statement not covered" > sdk = new NodeSDK({</span>
<span class="cstat-no" title="statement not covered" > resource,</span>
<span class="cstat-no" title="statement not covered" > spanProcessors,</span>
<span class="cstat-no" title="statement not covered" > ...(metricReader && { metricReader }),</span>
<span class="cstat-no" title="statement not covered" > sampler: new TraceIdRatioBasedSampler(</span>
<span class="cstat-no" title="statement not covered" > config.openTelemetry.samplingRatio,</span>
<span class="cstat-no" title="statement not covered" > ),</span>
<span class="cstat-no" title="statement not covered" > instrumentations: [</span>
<span class="cstat-no" title="statement not covered" > getNodeAutoInstrumentations({</span>
<span class="cstat-no" title="statement not covered" > '@opentelemetry/instrumentation-http': {</span>
<span class="cstat-no" title="statement not covered" > enabled: true,</span>
<span class="cstat-no" title="statement not covered" > ignoreIncomingRequestHook: (req) => req.url === '/healthz',</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > '@opentelemetry/instrumentation-fs': { enabled: false },</span>
<span class="cstat-no" title="statement not covered" > }),</span>
<span class="cstat-no" title="statement not covered" > new PinoInstrumentation({</span>
<span class="cstat-no" title="statement not covered" > logHook: (_span, record) => {</span>
<span class="cstat-no" title="statement not covered" > record['trace_id'] = _span.spanContext().traceId;</span>
<span class="cstat-no" title="statement not covered" > record['span_id'] = _span.spanContext().spanId;</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > }),</span>
<span class="cstat-no" title="statement not covered" > ],</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > sdk.start();</span>
<span class="cstat-no" title="statement not covered" > diag.info(</span>
<span class="cstat-no" title="statement not covered" > `OpenTelemetry NodeSDK initialized for ${config.openTelemetry.serviceName} v${config.openTelemetry.serviceVersion}`,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > } catch (error) {</span>
<span class="cstat-no" title="statement not covered" > diag.error('Error initializing OpenTelemetry', error);</span>
<span class="cstat-no" title="statement not covered" > sdk = null;</span>
<span class="cstat-no" title="statement not covered" > throw error;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > })();</span>
<span class="cstat-no" title="statement not covered" > return initializationPromise;</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Gracefully shuts down the OpenTelemetry SDK with timeout protection.
* This function is called during the application's shutdown sequence.
* Prevents hung processes by racing shutdown against a timeout.
*
* @param timeoutMs - Maximum time to wait for shutdown in milliseconds (default: 5000)
* @throws Error if shutdown times out or fails critically
*
* @example
* ```typescript
* // During application shutdown
* try {
* await shutdownOpenTelemetry();
* } catch (error) {
* console.error('Failed to shutdown telemetry:', error);
* }
* ```
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >export async function shutdownOpenTelemetry(timeoutMs = 5000): Promise<void> {</span></span>
<span class="cstat-no" title="statement not covered" > if (!sdk) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > const shutdownPromise = sdk.shutdown();</span>
<span class="cstat-no" title="statement not covered" > const timeoutPromise = new Promise<never>((_, reject) =></span>
<span class="cstat-no" title="statement not covered" > setTimeout(</span>
<span class="cstat-no" title="statement not covered" > () => reject(new Error('OpenTelemetry SDK shutdown timeout')),</span>
<span class="cstat-no" title="statement not covered" > timeoutMs,</span>
<span class="cstat-no" title="statement not covered" > ),</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > await Promise.race([shutdownPromise, timeoutPromise]);</span>
<span class="cstat-no" title="statement not covered" > diag.info('OpenTelemetry SDK terminated successfully.');</span>
<span class="cstat-no" title="statement not covered" > } catch (error) {</span>
<span class="cstat-no" title="statement not covered" > diag.error('Error terminating OpenTelemetry SDK', error);</span>
<span class="cstat-no" title="statement not covered" > throw error; // Propagate for caller handling</span>
<span class="cstat-no" title="statement not covered" > } finally {</span>
<span class="cstat-no" title="statement not covered" > sdk = null;</span>
<span class="cstat-no" title="statement not covered" > isOtelInitialized = false;</span>
<span class="cstat-no" title="statement not covered" > initializationPromise = null;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" >}</span>
</pre></td></tr></table></pre>
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