from __future__ import print_function

from opentracing.ext import tags

from ..utils import get_logger


logger = get_logger(__name__)


class RequestHandler(object):
    def __init__(self, tracer, context=None, ignore_active_span=True):
        self.tracer = tracer
        self.context = context
        self.ignore_active_span = ignore_active_span

    def before_request(self, request, request_context):
        logger.info('Before request %s' % request)

        # If we should ignore the active Span, use any passed SpanContext
        # as the parent. Else, use the active one.
        if self.ignore_active_span:
            span = self.tracer.start_span('send',
                                          child_of=self.context,
                                          ignore_active_span=True)
        else:
            span = self.tracer.start_span('send')

        span.set_tag(tags.SPAN_KIND, tags.SPAN_KIND_RPC_CLIENT)

        request_context['span'] = span

    def after_request(self, request, request_context):
        logger.info('After request %s' % request)

        span = request_context.get('span')
        if span is not None:
            span.finish()