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# Copyright (c) Microsoft. All rights reserved.
from typing import TYPE_CHECKING, Callable, Dict, List, Optional, Type, TypeVar, Union
from semantic_kernel.ai.chat_completion_client_base import ChatCompletionClientBase
from semantic_kernel.ai.embeddings.embedding_generator_base import (
EmbeddingGeneratorBase,
)
from semantic_kernel.ai.text_completion_client_base import TextCompletionClientBase
from semantic_kernel.reliability.pass_through_without_retry import (
PassThroughWithoutRetry,
)
from semantic_kernel.reliability.retry_mechanism import RetryMechanism
if TYPE_CHECKING:
from semantic_kernel.kernel_base import KernelBase
T = TypeVar("T")
class KernelConfig:
def __init__(self) -> None:
self._text_backends: Dict[
str, Callable[["KernelBase"], TextCompletionClientBase]
] = {}
self._chat_backends: Dict[
str, Callable[["KernelBase"], ChatCompletionClientBase]
] = {}
self._embedding_backends: Dict[
str, Callable[["KernelBase"], EmbeddingGeneratorBase]
] = {}
self._default_text_backend: Optional[str] = None
self._default_chat_backend: Optional[str] = None
self._default_embedding_backend: Optional[str] = None
self._retry_mechanism: RetryMechanism = PassThroughWithoutRetry()
def get_ai_backend(
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_backend
matching_type = self._text_backends
elif type == ChatCompletionClientBase:
service_id = service_id or self._default_chat_backend
matching_type = self._chat_backends
elif type == EmbeddingGeneratorBase:
service_id = service_id or self._default_embedding_backend
matching_type = self._embedding_backends
else:
raise ValueError(f"Unknown backend type: {type.__name__}")
if service_id not in matching_type:
raise ValueError(
f"{type.__name__} backend with service_id '{service_id}' not found"
)
return matching_type[service_id]
def all_text_backends(self) -> List[str]:
return list(self._text_backends.keys())
def all_chat_backends(self) -> List[str]:
return list(self._chat_backends.keys())
def all_embedding_backends(self) -> List[str]:
return list(self._embedding_backends.keys())
def add_text_backend(
self,
service_id: str,
backend: Union[
TextCompletionClientBase, Callable[["KernelBase"], TextCompletionClientBase]
],
overwrite: bool = True,
) -> "KernelConfig":
if not service_id:
raise ValueError("service_id must be a non-empty string")
if not overwrite and service_id in self._text_backends:
raise ValueError(
f"Text backend with service_id '{service_id}' already exists"
)
self._text_backends[service_id] = (
backend if isinstance(backend, Callable) else lambda _: backend
)
if self._default_text_backend is None:
self._default_text_backend = service_id
return self
def add_chat_backend(
self,
service_id: str,
backend: Union[
ChatCompletionClientBase, Callable[["KernelBase"], ChatCompletionClientBase]
],
overwrite: bool = True,
) -> "KernelConfig":
if not service_id:
raise ValueError("service_id must be a non-empty string")
if not overwrite and service_id in self._chat_backends:
raise ValueError(
f"Chat backend with service_id '{service_id}' already exists"
)
self._chat_backends[service_id] = (
backend if isinstance(backend, Callable) else lambda _: backend
)
if self._default_chat_backend is None:
self._default_chat_backend = service_id
return self
def add_embedding_backend(
self,
service_id: str,
backend: Union[
EmbeddingGeneratorBase, Callable[["KernelBase"], EmbeddingGeneratorBase]
],
overwrite: bool = False,
) -> "KernelConfig":
if not service_id:
raise ValueError("service_id must be a non-empty string")
if not overwrite and service_id in self._embedding_backends:
raise ValueError(
f"Embedding backend with service_id '{service_id}' already exists"
)
self._embedding_backends[service_id] = (
backend if isinstance(backend, Callable) else lambda _: backend
)
if self._default_embedding_backend is None:
self._default_embedding_backend = service_id
return self
# TODO: look harder at retry stuff
def set_default_text_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._text_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
self._default_text_backend = service_id
return self
def set_default_chat_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._chat_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
self._default_chat_backend = service_id
return self
def set_default_embedding_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._embedding_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
self._default_embedding_backend = service_id
return self
def get_text_backend_service_id(self, service_id: Optional[str] = None) -> str:
if service_id is None or service_id not in self._text_backends:
if self._default_text_backend is None:
raise ValueError("No default text backend is set")
return self._default_text_backend
return service_id
def get_chat_backend_service_id(self, service_id: Optional[str] = None) -> str:
if service_id is None or service_id not in self._chat_backends:
if self._default_chat_backend is None:
raise ValueError("No default chat backend is set")
return self._default_chat_backend
return service_id
def get_embedding_backend_service_id(self, service_id: Optional[str] = None) -> str:
if service_id is None or service_id not in self._embedding_backends:
if self._default_embedding_backend is None:
raise ValueError("No default embedding backend is set")
return self._default_embedding_backend
return service_id
def remove_text_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._text_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
del self._text_backends[service_id]
if self._default_text_backend == service_id:
self._default_text_backend = next(iter(self._text_backends), None)
return self
def remove_chat_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._chat_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
del self._chat_backends[service_id]
if self._default_chat_backend == service_id:
self._default_chat_backend = next(iter(self._chat_backends), None)
return self
def remove_embedding_backend(self, service_id: str) -> "KernelConfig":
if service_id not in self._embedding_backends:
raise ValueError(
f"AI backend with service_id '{service_id}' does not exist"
)
del self._embedding_backends[service_id]
if self._default_embedding_backend == service_id:
self._default_embedding_backend = next(iter(self._embedding_backends), None)
return self
def clear_all_text_backends(self) -> "KernelConfig":
self._text_backends = {}
self._default_text_backend = None
return self
def clear_all_chat_backends(self) -> "KernelConfig":
self._chat_backends = {}
self._default_chat_backend = None
return self
def clear_all_embedding_backends(self) -> "KernelConfig":
self._embedding_backends = {}
self._default_embedding_backend = None
return self
def clear_all_backends(self) -> "KernelConfig":
self._text_backends = {}
self._chat_backends = {}
self._embedding_backends = {}
self._default_text_backend = None
self._default_chat_backend = None
self._default_embedding_backend = None
return self