Function traceCloudMcpRequest

apps/cloud/src/server.ts:134–185

(
  request: Request,
  _env: Env,
  ctx: ExecutionContext,
  handle: (tracedRequest: Request) => Promise<Response>,
)

};

const traceCloudMcpRequest = async (
  request: Request,
  _env: Env,
  ctx: ExecutionContext,
  handle: (tracedRequest: Request) => Promise<Response>,
): Promise<Response> => {
  if (!installTracerProvider()) return handle(request);

  const url = new URL(request.url);
  const inbound = parseTraceparent(request.headers.get("traceparent"), null);
  const parentContext = inbound
    ? trace.setSpanContext(context.active(), {
        traceId: inbound.traceId,
        spanId: inbound.spanId,
        traceFlags: inbound.traceFlags,
        isRemote: true,
      })
    : context.active();

  return tracer.startActiveSpan(
    `http.server ${request.method}`,
    { kind: SpanKind.SERVER },
    parentContext,
    async (span) => {
      span.setAttribute(ATTR_HTTP_REQUEST_METHOD, request.method);
      span.setAttribute(ATTR_URL_FULL, request.url);
      span.setAttribute(ATTR_URL_PATH, url.pathname);
      span.setAttribute(ATTR_URL_SCHEME, url.protocol.replace(/:$/, ""));
      // oxlint-disable-next-line executor/no-try-catch-or-throw -- adapter boundary; observe response/error for span status, keep trace export alive after the Agents bridge resolves or rejects
      try {
        const response = await handle(withTraceparent(request, span.spanContext()));
        span.setAttribute(ATTR_HTTP_RESPONSE_STATUS_CODE, response.status);
        if (response.status >= 500) {
          span.setStatus({ code: SpanStatusCode.ERROR, message: `HTTP ${response.status}` });
        }
        return response;
      } catch (err) {
        // oxlint-disable-next-line executor/no-instanceof-error, executor/no-unknown-error-message -- adapter boundary: Cloudflare's fetch callback throws untyped; normalized only for the OTel span record, the original error is rethrown below
        const cause = err instanceof Error ? err : String(err);
        span.recordException(cause);
        // oxlint-disable-next-line executor/no-unknown-error-message -- adapter boundary: same normalization as the recordException line above
        const message = typeof cause === "string" ? cause : cause.message;
        span.setStatus({ code: SpanStatusCode.ERROR, message });
        // oxlint-disable-next-line executor/no-try-catch-or-throw -- adapter boundary; preserve original error to Cloudflare runtime
        throw err;
      } finally {
        span.end();
        ctx.waitUntil(flushTracerProvider());
      }
    },
  );
};

const mcpAgentHandler = makeCloudMcpAgentHandler();