module.request = function()

in src/plugins/HttpPlugin.ts [50:147]
46 lines of code
21 McCabe index (conditional complexity)

    module.request = function () {
      const url: URL | string | RequestOptions = arguments[0];

      const { host, pathname } =
        url instanceof URL
          ? url
          : typeof url === 'string'
          ? new URL(url) // TODO: this may throw invalid URL
          : {
              host: (url.host || url.hostname || 'unknown') + ':' + (url.port || 80),
              pathname: url.path || '/',
            };

      const operation = pathname.replace(/\?.*$/g, '');
      const method = arguments[url instanceof URL || typeof url === 'string' ? 1 : 0]?.method || 'GET';
      const span = ignoreHttpMethodCheck(method)
        ? DummySpan.create()
        : ContextManager.current.newExitSpan(operation, Component.HTTP);

      if (span.depth)
        // if we inherited from a higher level plugin then do nothing, higher level should do all the work and we don't duplicate here
        return _request.apply(this, arguments);

      span.start();

      try {
        span.component = Component.HTTP;
        span.layer = SpanLayer.HTTP;
        span.peer = host;

        span.tag(Tag.httpURL(protocol + '://' + host + pathname));
        span.tag(Tag.httpMethod(method));

        const copyStatusAndWrapEmit = (res: any) => {
          span.tag(Tag.httpStatusCode(res.statusCode));

          if (res.statusCode && res.statusCode >= 400) span.errored = true;

          if (res.statusMessage) span.tag(Tag.httpStatusMsg(res.statusMessage));

          wrapEmit(span, res, false);
        };

        const responseCB = function (this: any, res: any) {
          // may wrap callback instead of event because it procs first
          span.resync();

          copyStatusAndWrapEmit(res);

          try {
            if (callback) return callback.apply(this, arguments);
          } catch (err) {
            span.error(err);

            throw err;
          } finally {
            span.async();
          }
        };

        const idxCallback = typeof arguments[2] === 'function' ? 2 : typeof arguments[1] === 'function' ? 1 : 0;
        const callback = arguments[idxCallback];

        if (idxCallback) arguments[idxCallback] = responseCB;

        let arg0 = arguments[0];
        const expect = arg0.headers && (arg0.headers.Expect || arg0.headers.expect);

        if (expect === '100-continue') {
          span.inject().items.forEach((item) => {
            arg0.headers[item.key] = item.value;
          });
        }

        const req: ClientRequest = _request.apply(this, arguments);

        span
          .inject()
          .items.filter((item) => expect != '100-continue')
          .forEach((item) => req.setHeader(item.key, item.value));

        wrapEmit(span, req, true, 'close');

        req.on('timeout', () => span.log('Timeout', true));
        req.on('abort', () => span.log('Abort', (span.errored = true)));

        if (!idxCallback) req.on('response', copyStatusAndWrapEmit);

        span.async();

        return req;
      } catch (err) {
        span.error(err);
        span.stop();

        throw err;
      }
    };