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* Tracing Utilities
*
* Helper functions for creating and managing spans in OpenTelemetry.
* Use these utilities to instrument your application code.
*/
import {
trace,
SpanStatusCode,
Span,
context,
propagation,
SpanKind,
Attributes,
} from '@opentelemetry/api';
import type { NextRequest } from 'next/server';
// Get the tracer for this service
const tracer = trace.getTracer('elite-events');
/**
* Create and execute a span for tracing an operation
*
* @example
* ```typescript
* const result = await createSpan('process-order', async (span) => {
* span.setAttribute('order.id', orderId);
* return await processOrder(orderId);
* });
* ```
*/
export async function createSpan<T>(
name: string,
fn: (span: Span) => Promise<T>,
options?: {
attributes?: Attributes;
kind?: SpanKind;
}
): Promise<T> {
return tracer.startActiveSpan(
name,
{ kind: options?.kind ?? SpanKind.INTERNAL },
async (span) => {
try {
// Set initial attributes if provided
if (options?.attributes) {
span.setAttributes(options.attributes);
}
// Execute the function
const result = await fn(span);
// Mark as successful
span.setStatus({ code: SpanStatusCode.OK });
return result;
} catch (error) {
// Mark as error and record the exception
span.setStatus({
code: SpanStatusCode.ERROR,
message: error instanceof Error ? error.message : 'Unknown error',
});
if (error instanceof Error) {
span.recordException(error);
}
throw error;
} finally {
span.end();
}
}
);
}
/**
* Create a span for a database operation
*/
export async function createDbSpan<T>(
operation: string,
table: string,
fn: (span: Span) => Promise<T>
): Promise<T> {
return createSpan(`db.${operation}`, fn, {
kind: SpanKind.CLIENT,
attributes: {
'db.system': 'mysql',
'db.operation': operation,
'db.sql.table': table,
},
});
}
/**
* Create a span for an external HTTP call
*/
export async function createHttpSpan<T>(
method: string,
url: string,
fn: (span: Span) => Promise<T>
): Promise<T> {
const parsedUrl = new URL(url);
return createSpan(`HTTP ${method} ${parsedUrl.pathname}`, fn, {
kind: SpanKind.CLIENT,
attributes: {
'http.method': method,
'http.url': url,
'http.host': parsedUrl.host,
'http.scheme': parsedUrl.protocol.replace(':', ''),
},
});
}
/**
* Extract trace context from incoming request headers
*
* Use this in API routes to continue a trace from an incoming request.
*/
export function extractTraceContext(request: NextRequest | Request) {
const carrier: Record<string, string> = {};
request.headers.forEach((value, key) => {
carrier[key.toLowerCase()] = value;
});
return propagation.extract(context.active(), carrier);
}
/**
* Inject trace context into outgoing request headers
*
* Use this when making HTTP requests to propagate the trace.
*/
export function injectTraceContext(headers: Headers): void {
const carrier: Record<string, string> = {};
propagation.inject(context.active(), carrier);
Object.entries(carrier).forEach(([key, value]) => {
headers.set(key, value);
});
}
/**
* Get the current trace ID
*
* Useful for logging correlation.
*/
export function getCurrentTraceId(): string | undefined {
const span = trace.getActiveSpan();
return span?.spanContext().traceId;
}
/**
* Get the current span ID
*/
export function getCurrentSpanId(): string | undefined {
const span = trace.getActiveSpan();
return span?.spanContext().spanId;
}
/**
* Add attributes to the current active span
*
* @example
* ```typescript
* addSpanAttributes({
* 'user.id': userId,
* 'order.total': orderTotal,
* });
* ```
*/
export function addSpanAttributes(attributes: Attributes): void {
const span = trace.getActiveSpan();
if (span) {
span.setAttributes(attributes);
}
}
/**
* Add an event to the current active span
*
* Events are used to mark points of interest within a span.
*/
export function addSpanEvent(
name: string,
attributes?: Attributes
): void {
const span = trace.getActiveSpan();
if (span) {
span.addEvent(name, attributes);
}
}
/**
* Record an exception on the current active span
*/
export function recordException(error: Error): void {
const span = trace.getActiveSpan();
if (span) {
span.recordException(error);
span.setStatus({
code: SpanStatusCode.ERROR,
message: error.message,
});
}
}
/**
* Create a wrapper for API route handlers that adds tracing
*
* @example
* ```typescript
* export const GET = withTracing('GET /api/products', async (request) => {
* // Handler code
* });
* ```
*/
export function withTracing<T>(
operationName: string,
handler: (request: NextRequest | Request, span: Span) => Promise<T>
): (request: NextRequest | Request) => Promise<T> {
return async (request: NextRequest | Request) => {
// Extract context from incoming request
const ctx = extractTraceContext(request);
return context.with(ctx, async () => {
return createSpan(
operationName,
async (span) => {
// Add request attributes
span.setAttributes({
'http.method': request.method,
'http.url': request.url,
'http.user_agent': request.headers.get('user-agent') || 'unknown',
});
return handler(request, span);
},
{ kind: SpanKind.SERVER }
);
});
};
}
/**
* Get trace context as a string for logging
*
* Returns a string like "trace_id=abc123 span_id=def456"
*/
export function getTraceContextString(): string {
const traceId = getCurrentTraceId();
const spanId = getCurrentSpanId();
if (!traceId) return '';
return `trace_id=${traceId}${spanId ? ` span_id=${spanId}` : ''}`;
}
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