@ogcio/nextjs-o11y/dist/index.js

Custom middleware for OGCIO Observability

import { trace } from "@opentelemetry/api";
export const ACCESS_CONTROL_EXPOSE_HEADERS = "access-control-expose-headers";
export const X_TRACE_ID = "x-trace-id";
export default function o11y(_req, res) {
    try {
        const traceId = trace.getActiveSpan()?.spanContext()?.traceId;
        if (traceId) {
            res.headers.set(X_TRACE_ID, traceId);
        }
        const exposedHeaders = res.headers.get(ACCESS_CONTROL_EXPOSE_HEADERS);
        if (!exposedHeaders) {
            res.headers.set(ACCESS_CONTROL_EXPOSE_HEADERS, X_TRACE_ID);
            return;
        }
        if (exposedHeaders.toString().includes(X_TRACE_ID)) {
            return;
        }
        res.headers.set(ACCESS_CONTROL_EXPOSE_HEADERS, `${X_TRACE_ID}, ${exposedHeaders}`);
    }
    catch (error) {
        console.error("Observability Middleware Error:", error);
    }
}
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