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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.
from logging import getLogger
from os import environ
from typing import TYPE_CHECKING, TypeVar, cast
from opentelemetry.util._importlib_metadata import entry_points
if TYPE_CHECKING:
from opentelemetry.metrics import MeterProvider
from opentelemetry.trace import TracerProvider
Provider = TypeVar("Provider", "TracerProvider", "MeterProvider")
logger = getLogger(__name__)
def _load_provider(
provider_environment_variable: str, provider: str
) -> Provider: # type: ignore[type-var]
try:
provider_name = cast(
str,
environ.get(provider_environment_variable, f"default_{provider}"),
)
return cast(
Provider,
next( # type: ignore
iter( # type: ignore
entry_points( # type: ignore
group=f"opentelemetry_{provider}",
name=provider_name,
)
)
).load()(),
)
except Exception: # pylint: disable=broad-exception-caught
logger.exception("Failed to load configured provider %s", provider)
raise
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