Adding data base user attribute in Python EMF logs (#222)

*Issue #, if available:*

*Description of changes:*
- Adding data base user attribute in Python EMF logs - db.user.
- Added unit test for data base user attribute
- Added contract-tests

Output of EMF log:
```
{
    “Environment”: “ECS”,
    “RemoteDbUser”: “myuser”, <- Added Data base user
    “RemoteService”: “mysql”,
    “Service”: “python-appsignals-auto-cwa”,
        …
    },
    “Latency”: {
        “Values”: [
            …
        ],
        “Counts”: [
            …
        ],
        …
    }
}
```

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_attribute_keys.py

@@ -4,6 +4,7 @@
 AWS_SPAN_KIND: str = "aws.span.kind"
 AWS_LOCAL_SERVICE: str = "aws.local.service"
 AWS_LOCAL_OPERATION: str = "aws.local.operation"
+AWS_REMOTE_DB_USER: str = "aws.remote.db.user"
 AWS_REMOTE_SERVICE: str = "aws.remote.service"
 AWS_REMOTE_OPERATION: str = "aws.remote.operation"
 AWS_REMOTE_RESOURCE_TYPE: str = "aws.remote.resource.type"

aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_metric_attribute_generator.py

@@ -10,6 +10,7 @@
     AWS_LOCAL_SERVICE,
     AWS_QUEUE_NAME,
     AWS_QUEUE_URL,
+    AWS_REMOTE_DB_USER,
     AWS_REMOTE_OPERATION,
     AWS_REMOTE_RESOURCE_IDENTIFIER,
     AWS_REMOTE_RESOURCE_TYPE,
@@ -52,6 +53,7 @@
 _DB_OPERATION: str = SpanAttributes.DB_OPERATION
 _DB_STATEMENT: str = SpanAttributes.DB_STATEMENT
 _DB_SYSTEM: str = SpanAttributes.DB_SYSTEM
+_DB_USER: str = SpanAttributes.DB_USER
 _FAAS_INVOKED_NAME: str = SpanAttributes.FAAS_INVOKED_NAME
 _FAAS_TRIGGER: str = SpanAttributes.FAAS_TRIGGER
 _GRAPHQL_OPERATION_TYPE: str = SpanAttributes.GRAPHQL_OPERATION_TYPE
@@ -126,6 +128,7 @@ def _generate_dependency_metric_attributes(span: ReadableSpan, resource: Resourc
     _set_egress_operation(span, attributes)
     _set_remote_service_and_operation(span, attributes)
     _set_remote_type_and_identifier(span, attributes)
+    _set_remote_db_user(span, attributes)
     _set_span_kind_for_dependency(span, attributes)
     return attributes
 
@@ -451,6 +454,11 @@ def _escape_delimiters(input_str: str) -> Optional[str]:
     return input_str.replace("^", "^^").replace("|", "^|")
 
 
+def _set_remote_db_user(span: ReadableSpan, attributes: BoundedAttributes) -> None:
+    if is_db_span(span) and is_key_present(span, _DB_USER):
+        attributes[AWS_REMOTE_DB_USER] = span.attributes.get(_DB_USER)
+
+
 def _set_span_kind_for_dependency(span: ReadableSpan, attributes: BoundedAttributes) -> None:
     span_kind: str = span.kind.name
     attributes[AWS_SPAN_KIND] = span_kind

aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_metric_attribute_generator.py

@@ -13,6 +13,7 @@
     AWS_LOCAL_SERVICE,
     AWS_QUEUE_NAME,
     AWS_QUEUE_URL,
+    AWS_REMOTE_DB_USER,
     AWS_REMOTE_OPERATION,
     AWS_REMOTE_RESOURCE_IDENTIFIER,
     AWS_REMOTE_RESOURCE_TYPE,
@@ -773,6 +774,52 @@ def test_both_metric_when_local_root_consumer_process(self):
         self.assertIsNotNone(service_attributes)
         self.assertIsNotNone(dependency_attributes)
 
+    def test_db_user_attribute(self):
+        self._mock_attribute([SpanAttributes.DB_OPERATION, SpanAttributes.DB_USER], ["db_operation", "db_user"])
+        self.span_mock.kind = SpanKind.CLIENT
+
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+            self.span_mock, self.resource
+        ).get(DEPENDENCY_METRIC)
+        self.assertEqual(actual_attributes.get(AWS_REMOTE_OPERATION), "db_operation")
+        self.assertEqual(actual_attributes.get(AWS_REMOTE_DB_USER), "db_user")
+
+    def test_db_user_attribute_absent(self):
+        self._mock_attribute([SpanAttributes.DB_SYSTEM], ["db_system"])
+        self.span_mock.kind = SpanKind.CLIENT
+
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+            self.span_mock, self.resource
+        ).get(DEPENDENCY_METRIC)
+        self.assertIsNone(actual_attributes.get(AWS_REMOTE_DB_USER))
+
+    def test_db_user_attribute_not_present_in_service_metric_for_server_span(self):
+        self._mock_attribute([SpanAttributes.DB_USER, SpanAttributes.DB_SYSTEM], ["db_user", "db_system"])
+        self.span_mock.kind = SpanKind.SERVER
+
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+            self.span_mock, self.resource
+        ).get(SERVICE_METRIC)
+        self.assertIsNone(actual_attributes.get(AWS_REMOTE_DB_USER))
+
+    def test_db_user_attribute_with_different_values(self):
+        self._mock_attribute([SpanAttributes.DB_OPERATION, SpanAttributes.DB_USER], ["db_operation", "non_db_user"])
+        self.span_mock.kind = SpanKind.CLIENT
+
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+            self.span_mock, self.resource
+        ).get(DEPENDENCY_METRIC)
+        self.assertEqual(actual_attributes.get(AWS_REMOTE_DB_USER), "non_db_user")
+
+    def test_db_user_present_and_is_db_span_false(self):
+        self._mock_attribute([SpanAttributes.DB_USER], ["db_user"])
+        self.span_mock.kind = SpanKind.CLIENT
+
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+            self.span_mock, self.resource
+        ).get(DEPENDENCY_METRIC)
+        self.assertIsNone(actual_attributes.get(AWS_REMOTE_DB_USER))
+
     def test_local_root_boto3_span(self):
         self._update_resource_with_service_name()
         self.parent_span_context.is_valid = False

contract-tests/tests/test/amazon/base/database_contract_test_base.py

@@ -9,6 +9,7 @@
 from amazon.utils.application_signals_constants import (
     AWS_LOCAL_OPERATION,
     AWS_LOCAL_SERVICE,
+    AWS_REMOTE_DB_USER,
     AWS_REMOTE_OPERATION,
     AWS_REMOTE_RESOURCE_IDENTIFIER,
     AWS_REMOTE_RESOURCE_TYPE,
@@ -109,6 +110,7 @@ def _assert_aws_attributes(self, attributes_list: List[KeyValue], **kwargs) -> N
         self._assert_str_attribute(attributes_dict, AWS_REMOTE_SERVICE, self.get_remote_service())
         self._assert_str_attribute(attributes_dict, AWS_REMOTE_OPERATION, kwargs.get("sql_command"))
         self._assert_str_attribute(attributes_dict, AWS_REMOTE_RESOURCE_TYPE, "DB::Connection")
+        self._assert_str_attribute(attributes_dict, AWS_REMOTE_DB_USER, DATABASE_USER)
         self._assert_str_attribute(
             attributes_dict, AWS_REMOTE_RESOURCE_IDENTIFIER, self.get_remote_resource_identifier()
         )

contract-tests/tests/test/amazon/utils/application_signals_constants.py

@@ -12,6 +12,7 @@
 # Attribute names
 AWS_LOCAL_SERVICE: str = "aws.local.service"
 AWS_LOCAL_OPERATION: str = "aws.local.operation"
+AWS_REMOTE_DB_USER: str = "aws.remote.db.user"
 AWS_REMOTE_SERVICE: str = "aws.remote.service"
 AWS_REMOTE_OPERATION: str = "aws.remote.operation"
 AWS_REMOTE_RESOURCE_TYPE: str = "aws.remote.resource.type"