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"""The decorator to apply if you want the given function traced."""
import functools
from typing import Callable, Any, TypeVar, overload, Optional
from typing_extensions import ParamSpec
from .common import change_context, get_function_and_class_name
from . import SpanKind as _SpanKind
from ..settings import settings
P = ParamSpec("P")
T = TypeVar("T")
@overload
def distributed_trace(__func: Callable[P, T]) -> Callable[P, T]:
pass
@overload
def distributed_trace( # pylint:disable=function-redefined
**kwargs: Any, # pylint:disable=unused-argument
) -> Callable[[Callable[P, T]], Callable[P, T]]:
pass
def distributed_trace(
__func: Optional[Callable[P, T]] = None, **kwargs: Any
) -> Any: # pylint:disable=function-redefined
"""Decorator to apply to function to get traced automatically.
Span will use the func name or "name_of_span".
:param callable func: A function to decorate
:keyword name_of_span: The span name to replace func name if necessary
:paramtype name_of_span: str
:keyword kind: The kind of the span. INTERNAL by default.
:paramtype kind: ~azure.core.tracing.SpanKind
"""
name_of_span = kwargs.pop("name_of_span", None)
tracing_attributes = kwargs.pop("tracing_attributes", {})
kind = kwargs.pop("kind", _SpanKind.INTERNAL)
def decorator(func: Callable[P, T]) -> Callable[P, T]:
@functools.wraps(func)
def wrapper_use_tracer(*args: Any, **kwargs: Any) -> T:
merge_span = kwargs.pop("merge_span", False)
passed_in_parent = kwargs.pop("parent_span", None)
span_impl_type = settings.tracing_implementation()
if span_impl_type is None:
return func(*args, **kwargs)
# Merge span is parameter is set, but only if no explicit parent are passed
if merge_span and not passed_in_parent:
return func(*args, **kwargs)
with change_context(passed_in_parent):
name = name_of_span or get_function_and_class_name(func, *args)
with span_impl_type(name=name, kind=kind) as span:
for key, value in tracing_attributes.items():
span.add_attribute(key, value)
return func(*args, **kwargs)
return wrapper_use_tracer
return decorator if __func is None else decorator(__func)