botocore: Add DynamoDB extension (open-telemetry#735)

* botocore: Add dynamodb extension

* extract addtional DynamoDB specific attributes according to the spec
* move DynamoDB tests to separate test module

* changelog

* add license info

Co-authored-by: Diego Hurtado <ocelotl@users.noreply.github.com>

CHANGELOG.md

@@ -13,6 +13,8 @@ automatically by the auto instrumentor.
 ([#745](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/745))
 - `opentelemetry-instrumentation-pika` Bugfix use properties.headers. It will prevent the header injection from raising.
   ([#740](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/740))
+- `opentelemetry-instrumentation-botocore` Add extension for DynamoDB
+  ([#735](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/735))
 
 ## [1.6.0-0.25b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.6.0-0.25b0) - 2021-10-13
 ### Added

instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/__init__.py

@@ -214,7 +214,6 @@ def _patched_api_call(self, original_func, instance, args, kwargs):
             if BotocoreInstrumentor._is_lambda_invoke(call_context):
                 BotocoreInstrumentor._patch_lambda_invoke(call_context.params)
 
-            _set_api_call_attributes(span, call_context)
             _safe_invoke(extension.before_service_call, span)
             self._call_request_hook(span, call_context)
 
@@ -261,14 +260,6 @@ def _call_response_hook(
         )
 
 
-def _set_api_call_attributes(span, call_context: _AwsSdkCallContext):
-    if not span.is_recording():
-        return
-
-    if "TableName" in call_context.params:
-        span.set_attribute("aws.table_name", call_context.params["TableName"])
-
-
 def _apply_response_attributes(span: Span, result):
     if result is None or not span.is_recording():
         return

instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/__init__.py

@@ -1,3 +1,17 @@
+# 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.
+
 import importlib
 import logging
 
@@ -18,6 +32,7 @@ def loader():
 
 
 _KNOWN_EXTENSIONS = {
+    "dynamodb": _lazy_load(".dynamodb", "_DynamoDbExtension"),
     "sqs": _lazy_load(".sqs", "_SqsExtension"),
 }