Remove usage of pkg_resources

Fixes #2927

Author: ocelotl

exporter/opentelemetry-exporter-opencensus/pyproject.toml

@@ -32,6 +32,7 @@ dependencies = [
   "opentelemetry-sdk ~= 1.3",
   "protobuf ~= 3.13",
   "setuptools >= 16.0",
+  "importlib-metadata >= 5.0.0; python_version=='3.7'"
 ]
 
 [project.optional-dependencies]

exporter/opentelemetry-exporter-opencensus/src/opentelemetry/exporter/opencensus/util.py

@@ -15,8 +15,16 @@
 import os
 import socket
 import time
+from sys import version_info
 
-import pkg_resources
+# FIXME remove when support for 3.7 is dropped.
+if version_info.minor == 7:
+    # pylint: disable=import-error
+    from importlib_metadata import version
+else:
+    from importlib.metadata import version
+
+# pylint: disable=wrong-import-position
 from google.protobuf.timestamp_pb2 import Timestamp
 from opencensus.proto.agent.common.v1 import common_pb2
 from opencensus.proto.trace.v1 import trace_pb2
@@ -26,9 +34,7 @@
 )
 from opentelemetry.trace import SpanKind
 
-OPENTELEMETRY_VERSION = pkg_resources.get_distribution(
-    "opentelemetry-api"
-).version
+OPENTELEMETRY_VERSION = version("opentelemetry-api")
 
 
 def proto_timestamp_from_time_ns(time_ns):

exporter/opentelemetry-exporter-zipkin-json/tests/encoder/test_v1_json.py

@@ -28,7 +28,10 @@
 )
 from opentelemetry.trace import TraceFlags, format_span_id, format_trace_id
 
-from .common_tests import TEST_SERVICE_NAME, CommonEncoderTestCases
+from .common_tests import (  # pylint: disable=import-error
+    TEST_SERVICE_NAME,
+    CommonEncoderTestCases,
+)
 
 
 # pylint: disable=protected-access

exporter/opentelemetry-exporter-zipkin-json/tests/encoder/test_v2_json.py

@@ -28,7 +28,10 @@
 )
 from opentelemetry.trace import SpanKind, TraceFlags
 
-from .common_tests import TEST_SERVICE_NAME, CommonEncoderTestCases
+from .common_tests import (  # pylint: disable=import-error
+    TEST_SERVICE_NAME,
+    CommonEncoderTestCases,
+)
 
 
 # pylint: disable=protected-access

exporter/opentelemetry-exporter-zipkin-proto-http/tests/encoder/test_v2_protobuf.py

@@ -28,7 +28,10 @@
 )
 from opentelemetry.trace import SpanKind
 
-from .common_tests import TEST_SERVICE_NAME, CommonEncoderTestCases
+from .common_tests import (  # pylint: disable=import-error
+    TEST_SERVICE_NAME,
+    CommonEncoderTestCases,
+)
 
 
 # pylint: disable=protected-access

opentelemetry-api/src/opentelemetry/context/__init__.py

@@ -18,9 +18,16 @@
 import uuid
 from functools import wraps
 from os import environ
+from sys import version_info
 
-from pkg_resources import iter_entry_points
+# FIXME remove when support for 3.7 is dropped.
+if version_info.minor == 7:
+    # pylint: disable=import-error
+    from importlib_metadata import entry_points  # type: ignore
+else:
+    from importlib.metadata import entry_points
 
+# pylint: disable=wrong-import-position
 from opentelemetry.context.context import Context, _RuntimeContext
 from opentelemetry.environment_variables import OTEL_PYTHON_CONTEXT
 
@@ -41,25 +48,38 @@ def _load_runtime_context(func: _F) -> _F:
     @wraps(func)  # type: ignore[misc]
     def wrapper(  # type: ignore[misc]
         *args: typing.Tuple[typing.Any, typing.Any],
-        **kwargs: typing.Dict[typing.Any, typing.Any]
+        **kwargs: typing.Dict[typing.Any, typing.Any],
     ) -> typing.Optional[typing.Any]:
         global _RUNTIME_CONTEXT  # pylint: disable=global-statement
 
         with _RUNTIME_CONTEXT_LOCK:
             if _RUNTIME_CONTEXT is None:
-                # FIXME use a better implementation of a configuration manager to avoid having
-                # to get configuration values straight from environment variables
+                # FIXME use a better implementation of a configuration manager
+                # to avoid having to get configuration values straight from
+                # environment variables
                 default_context = "contextvars_context"
 
                 configured_context = environ.get(
                     OTEL_PYTHON_CONTEXT, default_context
                 )  # type: str
                 try:
-                    _RUNTIME_CONTEXT = next(
-                        iter_entry_points(
-                            "opentelemetry_context", configured_context
-                        )
-                    ).load()()
+                    if version_info.minor <= 9:
+                        for entry_point in entry_points()[  # type: ignore
+                            "opentelemetry_context"
+                        ]:
+                            if entry_point.name == configured_context:  # type: ignore
+                                _RUNTIME_CONTEXT = entry_point.load()()  # type: ignore
+                                break
+                        else:
+                            raise Exception(
+                                f"No entry point found for configured_context:"
+                                f" {configured_context}"
+                            )
+                    else:
+                        _RUNTIME_CONTEXT = entry_points(  # type: ignore
+                            group="opentelemetry_context",
+                            name=configured_context,
+                        )[0].load()()
                 except Exception:  # pylint: disable=broad-except
                     logger.error(
                         "Failed to load context: %s", configured_context

opentelemetry-api/src/opentelemetry/metrics/_internal/__init__.py

@@ -119,7 +119,7 @@ def get_meter(
 
             version: Optional. The version string of the
                 instrumenting library.  Usually this should be the same as
-                ``pkg_resources.get_distribution(instrumenting_library_name).version``.
+                ``importlib.metadata.version(instrumenting_library_name)``.
 
             schema_url: Optional. Specifies the Schema URL of the emitted telemetry.
         """

opentelemetry-api/src/opentelemetry/propagate/__init__.py

@@ -71,13 +71,19 @@ def example_route():
 import typing
 from logging import getLogger
 from os import environ
-
-from pkg_resources import iter_entry_points
+from sys import version_info
 
 from opentelemetry.context.context import Context
 from opentelemetry.environment_variables import OTEL_PROPAGATORS
 from opentelemetry.propagators import composite, textmap
 
+# FIXME remove when support for 3.7 is dropped.
+if version_info.minor == 7:
+    # pylint: disable=import-error
+    from importlib_metadata import entry_points  # type: ignore
+else:
+    from importlib.metadata import entry_points
+
 logger = getLogger(__name__)
 
 
@@ -129,14 +135,26 @@ def inject(
     "tracecontext,baggage",
 )
 
+
 for propagator in environ_propagators.split(","):
     propagator = propagator.strip()
     try:
-        propagators.append(  # type: ignore
-            next(  # type: ignore
-                iter_entry_points("opentelemetry_propagator", propagator)
-            ).load()()
-        )
+
+        if version_info.minor <= 9:
+
+            for entry_point in entry_points().get(  # type: ignore
+                "opentelemetry_propagator", []
+            ):
+                if entry_point.name == propagator:  # type: ignore
+                    propagators.append(entry_point.load()())  # type: ignore
+        else:
+
+            propagators.append(  # type: ignore
+                entry_points(  # type: ignore
+                    group="opentelemetry_propagator", name=propagator
+                )[0].load()()
+            )
+
     except Exception:  # pylint: disable=broad-except
         logger.exception(
             "Failed to load configured propagator `%s`", propagator

opentelemetry-api/src/opentelemetry/trace/__init__.py

@@ -216,7 +216,7 @@ def get_tracer(
 
             instrumenting_library_version: Optional. The version string of the
                 instrumenting library.  Usually this should be the same as
-                ``pkg_resources.get_distribution(instrumenting_library_name).version``.
+                ``importlib.metadata.version(instrumenting_library_name)``.
 
             schema_url: Optional. Specifies the Schema URL of the emitted telemetry.
         """

opentelemetry-api/src/opentelemetry/util/_providers.py

@@ -14,9 +14,15 @@
 
 from logging import getLogger
 from os import environ
+from sys import version_info
 from typing import TYPE_CHECKING, TypeVar, cast
 
-from pkg_resources import iter_entry_points
+# FIXME remove when support for 3.7 is dropped.
+if version_info.minor == 7:
+    # pylint: disable=import-error
+    from importlib_metadata import entry_points  # type: ignore
+else:
+    from importlib.metadata import entry_points
 
 if TYPE_CHECKING:
     from opentelemetry.metrics import MeterProvider
@@ -30,23 +36,36 @@
 def _load_provider(
     provider_environment_variable: str, provider: str
 ) -> Provider:
+
     try:
-        entry_point = next(
-            iter_entry_points(
-                f"opentelemetry_{provider}",
+
+        if version_info.minor <= 9:
+
+            provider_name = cast(
+                str,
+                environ.get(
+                    provider_environment_variable, f"default_{provider}"
+                ),
+            )
+
+            for entry_point in entry_points()[f"opentelemetry_{provider}"]:  # type: ignore
+                if entry_point.name == provider_name:  # type: ignore
+                    return cast(Provider, entry_point.load()())  # type: ignore
+            raise Exception(f"Provider {provider_name} not found")
+
+        return cast(
+            Provider,
+            entry_points(  # type: ignore
+                group=f"opentelemetry_{provider}",
                 name=cast(
                     str,
                     environ.get(
                         provider_environment_variable,
                         f"default_{provider}",
                     ),
                 ),
-            )
-        )
-        return cast(
-            Provider,
-            entry_point.load()(),
+            )[0].load()(),
         )
     except Exception:  # pylint: disable=broad-except
-        logger.error("Failed to load configured provider %s", provider)
+        logger.exception("Failed to load configured provider %s", provider)
         raise