return function zipkinRestifyMiddleware(req, res, next) {
const readHeader = (header) => headerOption(req, header);
const id = instrumentation.recordRequest(req.method, formatRequestUrl(req), readHeader);
const onCloseOrFinish = () => {
res.removeListener('close', onCloseOrFinish);
res.removeListener('finish', onCloseOrFinish);
tracer.scoped(() => {
instrumentation.recordResponse(id, res.statusCode);
});
};
res.once('close', onCloseOrFinish);
res.once('finish', onCloseOrFinish);
next();
};
tracer.scoped(() => {
instrumentation.recordResponse(id, res.statusCode);
});