Merge KernelConfig with Kernel (microsoft#731)

### Motivation and Context
KernelConfig isn't needed as it's less pythonic and is not used
independently from Kernel. This moves all its methods and members into
Kernel.

### Description
- Removed KernelConfig
- Put KernelConfig's methods and variables into Kernel
- Ran unit and end-to-end tests
- Did not run notebooks because they are out of date with the current
repo.

---------
Co-authored-by: Shawn Callegari <36091529+shawncal@users.noreply.github.com>

python/README.md

@@ -33,11 +33,11 @@ kernel = sk.Kernel()
 
 # Prepare OpenAI service using credentials stored in the `.env` file
 api_key, org_id = sk.openai_settings_from_dot_env()
-kernel.config.add_text_completion_service("dv", OpenAITextCompletion("text-davinci-003", api_key, org_id))
+kernel.add_text_completion_service("dv", OpenAITextCompletion("text-davinci-003", api_key, org_id))
 
 # Alternative using Azure:
 # deployment, api_key, endpoint = sk.azure_openai_settings_from_dot_env()
-# kernel.config.add_text_completion_service("dv", AzureTextCompletion(deployment, endpoint, api_key))
+# kernel.add_text_completion_service("dv", AzureTextCompletion(deployment, endpoint, api_key))
 
 # Wrap your prompt in a function
 prompt = kernel.create_semantic_function("""

python/semantic_kernel/__init__.py

@@ -2,7 +2,6 @@
 
 from semantic_kernel import core_skills, memory
 from semantic_kernel.kernel import Kernel
-from semantic_kernel.kernel_config import KernelConfig
 from semantic_kernel.orchestration.context_variables import ContextVariables
 from semantic_kernel.orchestration.sk_context import SKContext
 from semantic_kernel.orchestration.sk_function_base import SKFunctionBase
@@ -22,7 +21,6 @@
 
 __all__ = [
     "Kernel",
-    "KernelConfig",
     "NullLogger",
     "openai_settings_from_dot_env",
     "azure_openai_settings_from_dot_env",

python/semantic_kernel/kernel.py

@@ -2,7 +2,7 @@
 
 import inspect
 from logging import Logger
-from typing import Any, Dict, Optional
+from typing import Any, Callable, Dict, List, Optional, Type, TypeVar, Union
 
 from semantic_kernel.connectors.ai.ai_exception import AIException
 from semantic_kernel.connectors.ai.chat_completion_client_base import (
@@ -12,11 +12,13 @@
 from semantic_kernel.connectors.ai.complete_request_settings import (
     CompleteRequestSettings,
 )
+from semantic_kernel.connectors.ai.embeddings.embedding_generator_base import (
+    EmbeddingGeneratorBase,
+)
 from semantic_kernel.connectors.ai.text_completion_client_base import (
     TextCompletionClientBase,
 )
 from semantic_kernel.kernel_base import KernelBase
-from semantic_kernel.kernel_config import KernelConfig
 from semantic_kernel.kernel_exception import KernelException
 from semantic_kernel.kernel_extensions import KernelExtensions
 from semantic_kernel.memory.memory_store_base import MemoryStoreBase
@@ -26,6 +28,10 @@
 from semantic_kernel.orchestration.sk_context import SKContext
 from semantic_kernel.orchestration.sk_function import SKFunction
 from semantic_kernel.orchestration.sk_function_base import SKFunctionBase
+from semantic_kernel.reliability.pass_through_without_retry import (
+    PassThroughWithoutRetry,
+)
+from semantic_kernel.reliability.retry_mechanism import RetryMechanism
 from semantic_kernel.semantic_functions.semantic_function_config import (
     SemanticFunctionConfig,
 )
@@ -41,10 +47,10 @@
 from semantic_kernel.utils.null_logger import NullLogger
 from semantic_kernel.utils.validation import validate_function_name, validate_skill_name
 
+T = TypeVar("T")
 
 class Kernel(KernelBase, KernelExtensions):
     _log: Logger
-    _config: KernelConfig
     _skill_collection: SkillCollectionBase
     _prompt_template_engine: PromptTemplatingEngine
     _memory: SemanticTextMemoryBase
@@ -54,11 +60,9 @@ def __init__(
         skill_collection: Optional[SkillCollectionBase] = None,
         prompt_template_engine: Optional[PromptTemplatingEngine] = None,
         memory: Optional[SemanticTextMemoryBase] = None,
-        config: Optional[KernelConfig] = None,
         log: Optional[Logger] = None,
     ) -> None:
         self._log = log if log else NullLogger()
-        self._config = config if config else KernelConfig()
         self._skill_collection = (
             skill_collection if skill_collection else SkillCollection(self._log)
         )
@@ -69,13 +73,25 @@ def __init__(
         )
         self._memory = memory if memory else NullMemory()
 
+        self._text_completion_services: Dict[
+            str, Callable[["KernelBase"], TextCompletionClientBase]
+        ] = {}
+        self._chat_services: Dict[
+            str, Callable[["KernelBase"], ChatCompletionClientBase]
+        ] = {}
+        self._text_embedding_generation_services: Dict[
+            str, Callable[["KernelBase"], EmbeddingGeneratorBase]
+        ] = {}
+
+        self._default_text_completion_service: Optional[str] = None
+        self._default_chat_service: Optional[str] = None
+        self._default_text_embedding_generation_service: Optional[str] = None
+
+        self._retry_mechanism: RetryMechanism = PassThroughWithoutRetry()
+
     def kernel(self) -> KernelBase:
         return self
 
-    @property
-    def config(self) -> KernelConfig:
-        return self._config
-
     @property
     def logger(self) -> Logger:
         return self._log
@@ -248,6 +264,235 @@ def import_skill(
 
         return skill
 
+    def get_ai_service(
+        self, type: Type[T], service_id: Optional[str] = None
+    ) -> Callable[["KernelBase"], T]:
+        matching_type = {}
+        if type == TextCompletionClientBase:
+            service_id = service_id or self._default_text_completion_service
+            matching_type = self._text_completion_services
+        elif type == ChatCompletionClientBase:
+            service_id = service_id or self._default_chat_service
+            matching_type = self._chat_services
+        elif type == EmbeddingGeneratorBase:
+            service_id = service_id or self._default_text_embedding_generation_service
+            matching_type = self._text_embedding_generation_services
+        else:
+            raise ValueError(f"Unknown AI service type: {type.__name__}")
+
+        if service_id not in matching_type:
+            raise ValueError(
+                f"{type.__name__} service with service_id '{service_id}' not found"
+            )
+
+        return matching_type[service_id]
+
+    def all_text_completion_services(self) -> List[str]:
+        return list(self._text_completion_services.keys())
+
+    def all_chat_services(self) -> List[str]:
+        return list(self._chat_services.keys())
+
+    def all_text_embedding_generation_services(self) -> List[str]:
+        return list(self._text_embedding_generation_services.keys())
+
+    def add_text_completion_service(
+        self,
+        service_id: str,
+        service: Union[
+            TextCompletionClientBase, Callable[["KernelBase"], TextCompletionClientBase]
+        ],
+        overwrite: bool = True,
+    ) -> "Kernel":
+        if not service_id:
+            raise ValueError("service_id must be a non-empty string")
+        if not overwrite and service_id in self._text_completion_services:
+            raise ValueError(
+                f"Text service with service_id '{service_id}' already exists"
+            )
+
+        self._text_completion_services[service_id] = (
+            service if isinstance(service, Callable) else lambda _: service
+        )
+        if self._default_text_completion_service is None:
+            self._default_text_completion_service = service_id
+
+        return self
+
+    def add_chat_service(
+        self,
+        service_id: str,
+        service: Union[
+            ChatCompletionClientBase, Callable[["KernelBase"], ChatCompletionClientBase]
+        ],
+        overwrite: bool = True,
+    ) -> "Kernel":
+        if not service_id:
+            raise ValueError("service_id must be a non-empty string")
+        if not overwrite and service_id in self._chat_services:
+            raise ValueError(
+                f"Chat service with service_id '{service_id}' already exists"
+            )
+
+        self._chat_services[service_id] = (
+            service if isinstance(service, Callable) else lambda _: service
+        )
+        if self._default_chat_service is None:
+            self._default_chat_service = service_id
+
+        if isinstance(service, TextCompletionClientBase):
+            self.add_text_completion_service(service_id, service)
+            if self._default_text_completion_service is None:
+                self._default_text_completion_service = service_id
+
+        return self
+
+    def add_text_embedding_generation_service(
+        self,
+        service_id: str,
+        service: Union[
+            EmbeddingGeneratorBase, Callable[["KernelBase"], EmbeddingGeneratorBase]
+        ],
+        overwrite: bool = False,
+    ) -> "Kernel":
+        if not service_id:
+            raise ValueError("service_id must be a non-empty string")
+        if not overwrite and service_id in self._text_embedding_generation_services:
+            raise ValueError(
+                f"Embedding service with service_id '{service_id}' already exists"
+            )
+
+        self._text_embedding_generation_services[service_id] = (
+            service if isinstance(service, Callable) else lambda _: service
+        )
+        if self._default_text_embedding_generation_service is None:
+            self._default_text_embedding_generation_service = service_id
+
+        return self
+
+    def set_default_text_completion_service(self, service_id: str) -> "Kernel":
+        if service_id not in self._text_completion_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        self._default_text_completion_service = service_id
+        return self
+
+    def set_default_chat_service(self, service_id: str) -> "Kernel":
+        if service_id not in self._chat_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        self._default_chat_service = service_id
+        return self
+
+    def set_default_text_embedding_generation_service(
+        self, service_id: str
+    ) -> "Kernel":
+        if service_id not in self._text_embedding_generation_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        self._default_text_embedding_generation_service = service_id
+        return self
+
+    def get_text_completion_service_service_id(
+        self, service_id: Optional[str] = None
+    ) -> str:
+        if service_id is None or service_id not in self._text_completion_services:
+            if self._default_text_completion_service is None:
+                raise ValueError("No default text service is set")
+            return self._default_text_completion_service
+
+        return service_id
+
+    def get_chat_service_service_id(self, service_id: Optional[str] = None) -> str:
+        if service_id is None or service_id not in self._chat_services:
+            if self._default_chat_service is None:
+                raise ValueError("No default chat service is set")
+            return self._default_chat_service
+
+        return service_id
+
+    def get_text_embedding_generation_service_id(
+        self, service_id: Optional[str] = None
+    ) -> str:
+        if (
+            service_id is None
+            or service_id not in self._text_embedding_generation_services
+        ):
+            if self._default_text_embedding_generation_service is None:
+                raise ValueError("No default embedding service is set")
+            return self._default_text_embedding_generation_service
+
+        return service_id
+
+    def remove_text_completion_service(self, service_id: str) -> "Kernel":
+        if service_id not in self._text_completion_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        del self._text_completion_services[service_id]
+        if self._default_text_completion_service == service_id:
+            self._default_text_completion_service = next(
+                iter(self._text_completion_services), None
+            )
+        return self
+
+    def remove_chat_service(self, service_id: str) -> "Kernel":
+        if service_id not in self._chat_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        del self._chat_services[service_id]
+        if self._default_chat_service == service_id:
+            self._default_chat_service = next(iter(self._chat_services), None)
+        return self
+
+    def remove_text_embedding_generation_service(self, service_id: str) -> "Kernel":
+        if service_id not in self._text_embedding_generation_services:
+            raise ValueError(
+                f"AI service with service_id '{service_id}' does not exist"
+            )
+
+        del self._text_embedding_generation_services[service_id]
+        if self._default_text_embedding_generation_service == service_id:
+            self._default_text_embedding_generation_service = next(
+                iter(self._text_embedding_generation_services), None
+            )
+        return self
+
+    def clear_all_text_completion_services(self) -> "Kernel":
+        self._text_completion_services = {}
+        self._default_text_completion_service = None
+        return self
+
+    def clear_all_chat_services(self) -> "Kernel":
+        self._chat_services = {}
+        self._default_chat_service = None
+        return self
+
+    def clear_all_text_embedding_generation_services(self) -> "Kernel":
+        self._text_embedding_generation_services = {}
+        self._default_text_embedding_generation_service = None
+        return self
+
+    def clear_all_services(self) -> "Kernel":
+        self._text_completion_services = {}
+        self._chat_services = {}
+        self._text_embedding_generation_services = {}
+
+        self._default_text_completion_service = None
+        self._default_chat_service = None
+        self._default_text_embedding_generation_service = None
+
+        return self
+
     def _create_semantic_function(
         self,
         skill_name: str,
@@ -274,7 +519,7 @@ def _create_semantic_function(
         function.set_default_skill_collection(self.skills)
 
         if function_config.has_chat_prompt:
-            service = self._config.get_ai_service(
+            service = self.get_ai_service(
                 ChatCompletionClientBase,
                 function_config.prompt_template_config.default_services[0]
                 if len(function_config.prompt_template_config.default_services) > 0
@@ -297,7 +542,7 @@ def _create_semantic_function(
 
             function.set_chat_service(lambda: service(self))
         else:
-            service = self._config.get_ai_service(
+            service = self.get_ai_service(
                 TextCompletionClientBase,
                 function_config.prompt_template_config.default_services[0]
                 if len(function_config.prompt_template_config.default_services) > 0

python/semantic_kernel/kernel_base.py

@@ -4,7 +4,6 @@
 from logging import Logger
 from typing import Any, Dict, Optional
 
-from semantic_kernel.kernel_config import KernelConfig
 from semantic_kernel.memory.semantic_text_memory_base import SemanticTextMemoryBase
 from semantic_kernel.orchestration.context_variables import ContextVariables
 from semantic_kernel.orchestration.sk_context import SKContext
@@ -21,11 +20,6 @@
 
 
 class KernelBase(ABC):
-    @property
-    @abstractmethod
-    def config(self) -> KernelConfig:
-        pass
-
     @property
     @abstractmethod
     def logger(self) -> Logger: