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# Copyright The OpenTracing Authors
# Copyright Uber Technologies, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import
from .span import Span # noqa
from .span import SpanContext # noqa
from .scope import Scope # noqa
from .scope_manager import ScopeManager # noqa
from .tracer import child_of # noqa
from .tracer import follows_from # noqa
from .tracer import Reference # noqa
from .tracer import ReferenceType # noqa
from .tracer import Tracer # noqa
from .tracer import start_child_span # noqa
from .propagation import Format # noqa
from .propagation import InvalidCarrierException # noqa
from .propagation import SpanContextCorruptedException # noqa
from .propagation import UnsupportedFormatException # noqa
# Global variable that should be initialized to an instance of real tracer.
# Note: it should be accessed via 'opentracing.tracer', not via
# 'from opentracing import tracer', the latter seems to take a copy.
# DEPRECATED, use global_tracer() and set_global_tracer() instead.
tracer = Tracer()
is_tracer_registered = False
def global_tracer():
"""Returns the global tracer.
The default value is an instance of :class:`opentracing.Tracer`
:rtype: :class:`Tracer`
:return: The global tracer instance.
"""
return tracer
def set_global_tracer(value):
"""Sets the global tracer.
It is an error to pass ``None``.
:param value: the :class:`Tracer` used as global instance.
:type value: :class:`Tracer`
"""
if value is None:
raise ValueError('The global Tracer tracer cannot be None')
global tracer, is_tracer_registered
tracer = value
is_tracer_registered = True
def is_global_tracer_registered():
"""Indicates if a global tracer has been registered.
:rtype: :value:bool
:return: True if a global tracer has been registered, otherwise False.
"""
return is_tracer_registered
def _reset_global_tracer():
"""Reset any previously registered tracer. Intended for internal usage."""
global tracer, is_tracer_registered
tracer = Tracer()
is_tracer_registered = False
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