middleware.py 文件源码

def _finish_span(self, response=None, exception=None):
        """ Close and finish the active span if it exists. """
        span = getattr(g, 'flask_datadog_span', None)
        if span:
            if span.sampled:
                error = 0
                code = response.status_code if response else None
                method = request.method if request else None

                # if we didn't get a response, but we did get an exception, set
                # codes accordingly.
                if not response and exception:
                    code = 500
                    # The 3 next lines might not be strictly required, since `set_traceback`
                    # also get the exception from the sys.exc_info (and fill the error meta).
                    # Since we aren't sure it always work/for insuring no BC break, keep
                    # these lines which get overridden anyway.
                    error = 1
                    span.set_tag(errors.ERROR_TYPE, type(exception))
                    span.set_tag(errors.ERROR_MSG, exception)
                    # The provided `exception` object doesn't have a stack trace attached,
                    # so attach the stack trace with `set_traceback`.
                    span.set_traceback()

                # the endpoint that matched the request is None if an exception
                # happened so we fallback to a common resource
                resource = code if not request.endpoint else request.endpoint
                span.resource = compat.to_unicode(resource).lower()
                span.set_tag(http.URL, compat.to_unicode(request.base_url or ''))
                span.set_tag(http.STATUS_CODE, code)
                span.set_tag(http.METHOD, method)
                span.error = error
            span.finish()
            # Clear our span just in case.
            g.flask_datadog_span = None

    # Request hook methods