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"""Common functions shared by both the sync and the async decorators."""
from contextlib import contextmanager
import warnings
from ._abstract_span import AbstractSpan
from ..settings import settings
try:
from typing import TYPE_CHECKING
except ImportError:
TYPE_CHECKING = False
if TYPE_CHECKING:
from typing import Any, Optional, Union, Callable, List, Type, Generator
__all__ = [
'change_context',
'with_current_context',
]
def get_function_and_class_name(func, *args):
# type: (Callable, List[Any]) -> str
"""
Given a function and its unamed arguments, returns class_name.function_name. It assumes the first argument
is `self`. If there are no arguments then it only returns the function name.
:param func: the function passed in
:type func: callable
:param args: List of arguments passed into the function
"""
try:
return func.__qualname__
except AttributeError:
if args:
return "{}.{}".format(args[0].__class__.__name__, func.__name__) # pylint: disable=protected-access
return func.__name__
[docs]@contextmanager
def change_context(span):
# type: (Optional[AbstractSpan]) -> Generator
"""Execute this block inside the given context and restore it afterwards.
This does not start and ends the span, but just make sure all code is executed within
that span.
If span is None, no-op.
:param span: A span
:type span: AbstractSpan
:rtype: contextmanager
"""
span_impl_type = settings.tracing_implementation() # type: Type[AbstractSpan]
if span_impl_type is None or span is None:
yield
else:
try:
with span_impl_type.change_context(span):
yield
except AttributeError:
# This plugin does not support "change_context"
warnings.warn('Your tracing plugin should be updated to support "change_context"', DeprecationWarning)
original_span = span_impl_type.get_current_span()
try:
span_impl_type.set_current_span(span)
yield
finally:
span_impl_type.set_current_span(original_span)
[docs]def with_current_context(func):
# type: (Callable) -> Any
"""Passes the current spans to the new context the function will be run in.
:param func: The function that will be run in the new context
:return: The func wrapped with correct context
:rtype: callable
"""
span_impl_type = settings.tracing_implementation() # type: Type[AbstractSpan]
if span_impl_type is None:
return func
return span_impl_type.with_current_context(func)