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+# Copyright The OpenTelemetry Authors
+#
+# 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.
+
+"""
+The OpenTelemetry tracing API describes the classes used to generate
+distributed traces.
+
+The :class:`.Tracer` class controls access to the execution context, and
+manages span creation. Each operation in a trace is represented by a
+:class:`.Span`, which records the start, end time, and metadata associated with
+the operation.
+
+This module provides abstract (i.e. unimplemented) classes required for
+tracing, and a concrete no-op :class:`.NonRecordingSpan` that allows applications
+to use the API package alone without a supporting implementation.
+
+To get a tracer, you need to provide the package name from which you are
+calling the tracer APIs to OpenTelemetry by calling `TracerProvider.get_tracer`
+with the calling module name and the version of your package.
+
+The tracer supports creating spans that are "attached" or "detached" from the
+context. New spans are "attached" to the context in that they are
+created as children of the currently active span, and the newly-created span
+can optionally become the new active span::
+
+    from opentelemetry import trace
+
+    tracer = trace.get_tracer(__name__)
+
+    # Create a new root span, set it as the current span in context
+    with tracer.start_as_current_span("parent"):
+        # Attach a new child and update the current span
+        with tracer.start_as_current_span("child"):
+            do_work():
+        # Close child span, set parent as current
+    # Close parent span, set default span as current
+
+When creating a span that's "detached" from the context the active span doesn't
+change, and the caller is responsible for managing the span's lifetime::
+
+    # Explicit parent span assignment is done via the Context
+    from opentelemetry.trace import set_span_in_context
+
+    context = set_span_in_context(parent)
+    child = tracer.start_span("child", context=context)
+
+    try:
+        do_work(span=child)
+    finally:
+        child.end()
+
+Applications should generally use a single global TracerProvider, and use
+either implicit or explicit context propagation consistently throughout.
+
+.. versionadded:: 0.1.0
+.. versionchanged:: 0.3.0
+    `TracerProvider` was introduced and the global ``tracer`` getter was
+    replaced by ``tracer_provider``.
+.. versionchanged:: 0.5.0
+    ``tracer_provider`` was replaced by `get_tracer_provider`,
+    ``set_preferred_tracer_provider_implementation`` was replaced by
+    `set_tracer_provider`.
+"""
+
+import os
+import typing
+from abc import ABC, abstractmethod
+from enum import Enum
+from logging import getLogger
+from typing import Iterator, Optional, Sequence, cast
+
+from deprecated import deprecated
+
+from opentelemetry import context as context_api
+from opentelemetry.attributes import BoundedAttributes
+from opentelemetry.context.context import Context
+from opentelemetry.environment_variables import OTEL_PYTHON_TRACER_PROVIDER
+from opentelemetry.trace.propagation import (
+    _SPAN_KEY,
+    get_current_span,
+    set_span_in_context,
+)
+from opentelemetry.trace.span import (
+    DEFAULT_TRACE_OPTIONS,
+    DEFAULT_TRACE_STATE,
+    INVALID_SPAN,
+    INVALID_SPAN_CONTEXT,
+    INVALID_SPAN_ID,
+    INVALID_TRACE_ID,
+    NonRecordingSpan,
+    Span,
+    SpanContext,
+    TraceFlags,
+    TraceState,
+    format_span_id,
+    format_trace_id,
+)
+from opentelemetry.trace.status import Status, StatusCode
+from opentelemetry.util import types
+from opentelemetry.util._decorator import _agnosticcontextmanager
+from opentelemetry.util._once import Once
+from opentelemetry.util._providers import _load_provider
+
+logger = getLogger(__name__)
+
+
+class _LinkBase(ABC):
+    def __init__(self, context: "SpanContext") -> None:
+        self._context = context
+
+    @property
+    def context(self) -> "SpanContext":
+        return self._context
+
+    @property
+    @abstractmethod
+    def attributes(self) -> types.Attributes:
+        pass
+
+
+class Link(_LinkBase):
+    """A link to a `Span`. The attributes of a Link are immutable.
+
+    Args:
+        context: `SpanContext` of the `Span` to link to.
+        attributes: Link's attributes.
+    """
+
+    def __init__(
+        self,
+        context: "SpanContext",
+        attributes: types.Attributes = None,
+    ) -> None:
+        super().__init__(context)
+        self._attributes = attributes
+
+    @property
+    def attributes(self) -> types.Attributes:
+        return self._attributes
+
+    @property
+    def dropped_attributes(self) -> int:
+        if isinstance(self._attributes, BoundedAttributes):
+            return self._attributes.dropped
+        return 0
+
+
+_Links = Optional[Sequence[Link]]
+
+
+class SpanKind(Enum):
+    """Specifies additional details on how this span relates to its parent span.
+
+    Note that this enumeration is experimental and likely to change. See
+    https://github.com/open-telemetry/opentelemetry-specification/pull/226.
+    """
+
+    #: Default value. Indicates that the span is used internally in the
+    # application.
+    INTERNAL = 0
+
+    #: Indicates that the span describes an operation that handles a remote
+    # request.
+    SERVER = 1
+
+    #: Indicates that the span describes a request to some remote service.
+    CLIENT = 2
+
+    #: Indicates that the span describes a producer sending a message to a
+    #: broker. Unlike client and server, there is usually no direct critical
+    #: path latency relationship between producer and consumer spans.
+    PRODUCER = 3
+
+    #: Indicates that the span describes a consumer receiving a message from a
+    #: broker. Unlike client and server, there is usually no direct critical
+    #: path latency relationship between producer and consumer spans.
+    CONSUMER = 4
+
+
+class TracerProvider(ABC):
+    @abstractmethod
+    def get_tracer(
+        self,
+        instrumenting_module_name: str,
+        instrumenting_library_version: typing.Optional[str] = None,
+        schema_url: typing.Optional[str] = None,
+        attributes: typing.Optional[types.Attributes] = None,
+    ) -> "Tracer":
+        """Returns a `Tracer` for use by the given instrumentation library.
+
+        For any two calls it is undefined whether the same or different
+        `Tracer` instances are returned, even for different library names.
+
+        This function may return different `Tracer` types (e.g. a no-op tracer
+        vs.  a functional tracer).
+
+        Args:
+            instrumenting_module_name: The uniquely identifiable name for instrumentation
+                scope, such as instrumentation library, package, module or class name.
+                ``__name__`` may not be used as this can result in
+                different tracer names if the tracers are in different files.
+                It is better to use a fixed string that can be imported where
+                needed and used consistently as the name of the tracer.
+
+                This should *not* be the name of the module that is
+                instrumented but the name of the module doing the instrumentation.
+                E.g., instead of ``"requests"``, use
+                ``"opentelemetry.instrumentation.requests"``.
+
+            instrumenting_library_version: Optional. The version string of the
+                instrumenting library.  Usually this should be the same as
+                ``importlib.metadata.version(instrumenting_library_name)``.
+
+            schema_url: Optional. Specifies the Schema URL of the emitted telemetry.
+            attributes: Optional. Specifies the attributes of the emitted telemetry.
+        """
+
+
+class NoOpTracerProvider(TracerProvider):
+    """The default TracerProvider, used when no implementation is available.
+
+    All operations are no-op.
+    """
+
+    def get_tracer(
+        self,
+        instrumenting_module_name: str,
+        instrumenting_library_version: typing.Optional[str] = None,
+        schema_url: typing.Optional[str] = None,
+        attributes: typing.Optional[types.Attributes] = None,
+    ) -> "Tracer":
+        # pylint:disable=no-self-use,unused-argument
+        return NoOpTracer()
+
+
+@deprecated(version="1.9.0", reason="You should use NoOpTracerProvider")  # type: ignore
+class _DefaultTracerProvider(NoOpTracerProvider):
+    """The default TracerProvider, used when no implementation is available.
+
+    All operations are no-op.
+    """
+
+
+class ProxyTracerProvider(TracerProvider):
+    def get_tracer(
+        self,
+        instrumenting_module_name: str,
+        instrumenting_library_version: typing.Optional[str] = None,
+        schema_url: typing.Optional[str] = None,
+        attributes: typing.Optional[types.Attributes] = None,
+    ) -> "Tracer":
+        if _TRACER_PROVIDER:
+            return _TRACER_PROVIDER.get_tracer(
+                instrumenting_module_name,
+                instrumenting_library_version,
+                schema_url,
+                attributes,
+            )
+        return ProxyTracer(
+            instrumenting_module_name,
+            instrumenting_library_version,
+            schema_url,
+            attributes,
+        )
+
+
+class Tracer(ABC):
+    """Handles span creation and in-process context propagation.
+
+    This class provides methods for manipulating the context, creating spans,
+    and controlling spans' lifecycles.
+    """
+
+    @abstractmethod
+    def start_span(
+        self,
+        name: str,
+        context: Optional[Context] = None,
+        kind: SpanKind = SpanKind.INTERNAL,
+        attributes: types.Attributes = None,
+        links: _Links = None,
+        start_time: Optional[int] = None,
+        record_exception: bool = True,
+        set_status_on_exception: bool = True,
+    ) -> "Span":
+        """Starts a span.
+
+        Create a new span. Start the span without setting it as the current
+        span in the context. To start the span and use the context in a single
+        method, see :meth:`start_as_current_span`.
+
+        By default the current span in the context will be used as parent, but an
+        explicit context can also be specified, by passing in a `Context` containing
+        a current `Span`. If there is no current span in the global `Context` or in
+        the specified context, the created span will be a root span.
+
+        The span can be used as a context manager. On exiting the context manager,
+        the span's end() method will be called.
+
+        Example::
+
+            # trace.get_current_span() will be used as the implicit parent.
+            # If none is found, the created span will be a root instance.
+            with tracer.start_span("one") as child:
+                child.add_event("child's event")
+
+        Args:
+            name: The name of the span to be created.
+            context: An optional Context containing the span's parent. Defaults to the
+                global context.
+            kind: The span's kind (relationship to parent). Note that is
+                meaningful even if there is no parent.
+            attributes: The span's attributes.
+            links: Links span to other spans
+            start_time: Sets the start time of a span
+            record_exception: Whether to record any exceptions raised within the
+                context as error event on the span.
+            set_status_on_exception: Only relevant if the returned span is used
+                in a with/context manager. Defines whether the span status will
+                be automatically set to ERROR when an uncaught exception is
+                raised in the span with block. The span status won't be set by
+                this mechanism if it was previously set manually.
+
+        Returns:
+            The newly-created span.
+        """
+
+    @_agnosticcontextmanager
+    @abstractmethod
+    def start_as_current_span(
+        self,
+        name: str,
+        context: Optional[Context] = None,
+        kind: SpanKind = SpanKind.INTERNAL,
+        attributes: types.Attributes = None,
+        links: _Links = None,
+        start_time: Optional[int] = None,
+        record_exception: bool = True,
+        set_status_on_exception: bool = True,
+        end_on_exit: bool = True,
+    ) -> Iterator["Span"]:
+        """Context manager for creating a new span and set it
+        as the current span in this tracer's context.
+
+        Exiting the context manager will call the span's end method,
+        as well as return the current span to its previous value by
+        returning to the previous context.
+
+        Example::
+
+            with tracer.start_as_current_span("one") as parent:
+                parent.add_event("parent's event")
+                with tracer.start_as_current_span("two") as child:
+                    child.add_event("child's event")
+                    trace.get_current_span()  # returns child
+                trace.get_current_span()      # returns parent
+            trace.get_current_span()          # returns previously active span
+
+        This is a convenience method for creating spans attached to the
+        tracer's context. Applications that need more control over the span
+        lifetime should use :meth:`start_span` instead. For example::
+
+            with tracer.start_as_current_span(name) as span:
+                do_work()
+
+        is equivalent to::
+
+            span = tracer.start_span(name)
+            with opentelemetry.trace.use_span(span, end_on_exit=True):
+                do_work()
+
+        This can also be used as a decorator::
+
+            @tracer.start_as_current_span("name")
+            def function():
+                ...
+
+            function()
+
+        Args:
+            name: The name of the span to be created.
+            context: An optional Context containing the span's parent. Defaults to the
+                global context.
+            kind: The span's kind (relationship to parent). Note that is
+                meaningful even if there is no parent.
+            attributes: The span's attributes.
+            links: Links span to other spans
+            start_time: Sets the start time of a span
+            record_exception: Whether to record any exceptions raised within the
+                context as error event on the span.
+            set_status_on_exception: Only relevant if the returned span is used
+                in a with/context manager. Defines whether the span status will
+                be automatically set to ERROR when an uncaught exception is
+                raised in the span with block. The span status won't be set by
+                this mechanism if it was previously set manually.
+            end_on_exit: Whether to end the span automatically when leaving the
+                context manager.
+
+        Yields:
+            The newly-created span.
+        """
+
+
+class ProxyTracer(Tracer):
+    # pylint: disable=W0222,signature-differs
+    def __init__(
+        self,
+        instrumenting_module_name: str,
+        instrumenting_library_version: typing.Optional[str] = None,
+        schema_url: typing.Optional[str] = None,
+        attributes: typing.Optional[types.Attributes] = None,
+    ):
+        self._instrumenting_module_name = instrumenting_module_name
+        self._instrumenting_library_version = instrumenting_library_version
+        self._schema_url = schema_url
+        self._attributes = attributes
+        self._real_tracer: Optional[Tracer] = None
+        self._noop_tracer = NoOpTracer()
+
+    @property
+    def _tracer(self) -> Tracer:
+        if self._real_tracer:
+            return self._real_tracer
+
+        if _TRACER_PROVIDER:
+            self._real_tracer = _TRACER_PROVIDER.get_tracer(
+                self._instrumenting_module_name,
+                self._instrumenting_library_version,
+                self._schema_url,
+                self._attributes,
+            )
+            return self._real_tracer
+        return self._noop_tracer
+
+    def start_span(self, *args, **kwargs) -> Span:  # type: ignore
+        return self._tracer.start_span(*args, **kwargs)  # type: ignore
+
+    @_agnosticcontextmanager  # type: ignore
+    def start_as_current_span(self, *args, **kwargs) -> Iterator[Span]:
+        with self._tracer.start_as_current_span(*args, **kwargs) as span:  # type: ignore
+            yield span
+
+
+class NoOpTracer(Tracer):
+    """The default Tracer, used when no Tracer implementation is available.
+
+    All operations are no-op.
+    """
+
+    def start_span(
+        self,
+        name: str,
+        context: Optional[Context] = None,
+        kind: SpanKind = SpanKind.INTERNAL,
+        attributes: types.Attributes = None,
+        links: _Links = None,
+        start_time: Optional[int] = None,
+        record_exception: bool = True,
+        set_status_on_exception: bool = True,
+    ) -> "Span":
+        return INVALID_SPAN
+
+    @_agnosticcontextmanager
+    def start_as_current_span(
+        self,
+        name: str,
+        context: Optional[Context] = None,
+        kind: SpanKind = SpanKind.INTERNAL,
+        attributes: types.Attributes = None,
+        links: _Links = None,
+        start_time: Optional[int] = None,
+        record_exception: bool = True,
+        set_status_on_exception: bool = True,
+        end_on_exit: bool = True,
+    ) -> Iterator["Span"]:
+        yield INVALID_SPAN
+
+
+@deprecated(version="1.9.0", reason="You should use NoOpTracer")  # type: ignore
+class _DefaultTracer(NoOpTracer):
+    """The default Tracer, used when no Tracer implementation is available.
+
+    All operations are no-op.
+    """
+
+
+_TRACER_PROVIDER_SET_ONCE = Once()
+_TRACER_PROVIDER: Optional[TracerProvider] = None
+_PROXY_TRACER_PROVIDER = ProxyTracerProvider()
+
+
+def get_tracer(
+    instrumenting_module_name: str,
+    instrumenting_library_version: typing.Optional[str] = None,
+    tracer_provider: Optional[TracerProvider] = None,
+    schema_url: typing.Optional[str] = None,
+    attributes: typing.Optional[types.Attributes] = None,
+) -> "Tracer":
+    """Returns a `Tracer` for use by the given instrumentation library.
+
+    This function is a convenience wrapper for
+    opentelemetry.trace.TracerProvider.get_tracer.
+
+    If tracer_provider is omitted the current configured one is used.
+    """
+    if tracer_provider is None:
+        tracer_provider = get_tracer_provider()
+    return tracer_provider.get_tracer(
+        instrumenting_module_name,
+        instrumenting_library_version,
+        schema_url,
+        attributes,
+    )
+
+
+def _set_tracer_provider(tracer_provider: TracerProvider, log: bool) -> None:
+    def set_tp() -> None:
+        global _TRACER_PROVIDER  # pylint: disable=global-statement
+        _TRACER_PROVIDER = tracer_provider
+
+    did_set = _TRACER_PROVIDER_SET_ONCE.do_once(set_tp)
+
+    if log and not did_set:
+        logger.warning("Overriding of current TracerProvider is not allowed")
+
+
+def set_tracer_provider(tracer_provider: TracerProvider) -> None:
+    """Sets the current global :class:`~.TracerProvider` object.
+
+    This can only be done once, a warning will be logged if any further attempt
+    is made.
+    """
+    _set_tracer_provider(tracer_provider, log=True)
+
+
+def get_tracer_provider() -> TracerProvider:
+    """Gets the current global :class:`~.TracerProvider` object."""
+    if _TRACER_PROVIDER is None:
+        # if a global tracer provider has not been set either via code or env
+        # vars, return a proxy tracer provider
+        if OTEL_PYTHON_TRACER_PROVIDER not in os.environ:
+            return _PROXY_TRACER_PROVIDER
+
+        tracer_provider: TracerProvider = _load_provider(
+            OTEL_PYTHON_TRACER_PROVIDER, "tracer_provider"
+        )
+        _set_tracer_provider(tracer_provider, log=False)
+    # _TRACER_PROVIDER will have been set by one thread
+    return cast("TracerProvider", _TRACER_PROVIDER)
+
+
+@_agnosticcontextmanager
+def use_span(
+    span: Span,
+    end_on_exit: bool = False,
+    record_exception: bool = True,
+    set_status_on_exception: bool = True,
+) -> Iterator[Span]:
+    """Takes a non-active span and activates it in the current context.
+
+    Args:
+        span: The span that should be activated in the current context.
+        end_on_exit: Whether to end the span automatically when leaving the
+            context manager scope.
+        record_exception: Whether to record any exceptions raised within the
+            context as error event on the span.
+        set_status_on_exception: Only relevant if the returned span is used
+            in a with/context manager. Defines whether the span status will
+            be automatically set to ERROR when an uncaught exception is
+            raised in the span with block. The span status won't be set by
+            this mechanism if it was previously set manually.
+    """
+    try:
+        token = context_api.attach(context_api.set_value(_SPAN_KEY, span))
+        try:
+            yield span
+        finally:
+            context_api.detach(token)
+
+    # Record only exceptions that inherit Exception class but not BaseException, because
+    # classes that directly inherit BaseException are not technically errors, e.g. GeneratorExit.
+    # See https://github.com/open-telemetry/opentelemetry-python/issues/4484
+    except Exception as exc:  # pylint: disable=broad-exception-caught
+        if isinstance(span, Span) and span.is_recording():
+            # Record the exception as an event
+            if record_exception:
+                span.record_exception(exc)
+
+            # Set status in case exception was raised
+            if set_status_on_exception:
+                span.set_status(
+                    Status(
+                        status_code=StatusCode.ERROR,
+                        description=f"{type(exc).__name__}: {exc}",
+                    )
+                )
+
+        # This causes parent spans to set their status to ERROR and to record
+        # an exception as an event if a child span raises an exception even if
+        # such child span was started with both record_exception and
+        # set_status_on_exception attributes set to False.
+        raise
+
+    finally:
+        if end_on_exit:
+            span.end()
+
+
+__all__ = [
+    "DEFAULT_TRACE_OPTIONS",
+    "DEFAULT_TRACE_STATE",
+    "INVALID_SPAN",
+    "INVALID_SPAN_CONTEXT",
+    "INVALID_SPAN_ID",
+    "INVALID_TRACE_ID",
+    "NonRecordingSpan",
+    "Link",
+    "Span",
+    "SpanContext",
+    "SpanKind",
+    "TraceFlags",
+    "TraceState",
+    "TracerProvider",
+    "Tracer",
+    "format_span_id",
+    "format_trace_id",
+    "get_current_span",
+    "get_tracer",
+    "get_tracer_provider",
+    "set_tracer_provider",
+    "set_span_in_context",
+    "use_span",
+    "Status",
+    "StatusCode",
+]