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# Copyright 2024 Google LLC
#
# 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.
#
from typing import Optional
from typing import Union
from . import _transformers as t
from .models import AsyncModels, Models
from .types import Content, ContentDict, GenerateContentConfigOrDict, GenerateContentResponse, Part, PartUnionDict
def _validate_response(response: GenerateContentResponse) -> bool:
if not response.candidates:
return False
if not response.candidates[0].content:
return False
if not response.candidates[0].content.parts:
return False
for part in response.candidates[0].content.parts:
if part == Part():
return False
if part.text is not None and part.text == "":
return False
return True
class _BaseChat:
"""Base chat session."""
def __init__(
self,
*,
modules: Union[Models, AsyncModels],
model: str,
config: GenerateContentConfigOrDict = None,
history: list[Content],
):
self._modules = modules
self._model = model
self._config = config
self._curated_history = history
class Chat(_BaseChat):
"""Chat session."""
def send_message(
self, message: Union[list[PartUnionDict], PartUnionDict]
) -> GenerateContentResponse:
"""Sends the conversation history with the additional message and returns the model's response.
Args:
message: The message to send to the model.
Returns:
The model's response.
Usage:
.. code-block:: python
chat = client.chats.create(model='gemini-1.5-flash')
response = chat.send_message('tell me a story')
"""
input_content = t.t_content(self._modules._api_client, message)
response = self._modules.generate_content(
model=self._model,
contents=self._curated_history + [input_content],
config=self._config,
)
if _validate_response(response):
if response.automatic_function_calling_history:
self._curated_history.extend(
response.automatic_function_calling_history
)
else:
self._curated_history.append(input_content)
self._curated_history.append(response.candidates[0].content)
return response
def send_message_stream(
self, message: Union[list[PartUnionDict], PartUnionDict]
):
"""Sends the conversation history with the additional message and yields the model's response in chunks.
Args:
message: The message to send to the model.
Yields:
The model's response in chunks.
Usage:
.. code-block:: python
chat = client.chats.create(model='gemini-1.5-flash')
for chunk in chat.send_message_stream('tell me a story'):
print(chunk.text)
"""
input_content = t.t_content(self._modules._api_client, message)
output_contents = []
finish_reason = None
for chunk in self._modules.generate_content_stream(
model=self._model,
contents=self._curated_history + [input_content],
config=self._config,
):
if _validate_response(chunk):
output_contents.append(chunk.candidates[0].content)
if chunk.candidates and chunk.candidates[0].finish_reason:
finish_reason = chunk.candidates[0].finish_reason
yield chunk
if output_contents and finish_reason:
self._curated_history.append(input_content)
self._curated_history.extend(output_contents)
class Chats:
"""A util class to create chat sessions."""
def __init__(self, modules: Models):
self._modules = modules
def create(
self,
*,
model: str,
config: GenerateContentConfigOrDict = None,
history: Optional[list[Content]] = None,
) -> Chat:
"""Creates a new chat session.
Args:
model: The model to use for the chat.
config: The configuration to use for the generate content request.
history: The history to use for the chat.
Returns:
A new chat session.
"""
return Chat(
modules=self._modules,
model=model,
config=config,
history=history if history else [],
)
class AsyncChat(_BaseChat):
"""Async chat session."""
async def send_message(
self, message: Union[list[PartUnionDict], PartUnionDict]
) -> GenerateContentResponse:
"""Sends the conversation history with the additional message and returns model's response.
Args:
message: The message to send to the model.
Returns:
The model's response.
Usage:
.. code-block:: python
chat = client.aio.chats.create(model='gemini-1.5-flash')
response = await chat.send_message('tell me a story')
"""
input_content = t.t_content(self._modules._api_client, message)
response = await self._modules.generate_content(
model=self._model,
contents=self._curated_history + [input_content],
config=self._config,
)
if _validate_response(response):
if response.automatic_function_calling_history:
self._curated_history.extend(
response.automatic_function_calling_history
)
else:
self._curated_history.append(input_content)
self._curated_history.append(response.candidates[0].content)
return response
async def send_message_stream(
self, message: Union[list[PartUnionDict], PartUnionDict]
):
"""Sends the conversation history with the additional message and yields the model's response in chunks.
Args:
message: The message to send to the model.
Yields:
The model's response in chunks.
Usage:
.. code-block:: python
chat = client.aio.chats.create(model='gemini-1.5-flash')
async for chunk in chat.send_message_stream('tell me a story'):
print(chunk.text)
"""
input_content = t.t_content(self._modules._api_client, message)
output_contents = []
finish_reason = None
async for chunk in self._modules.generate_content_stream(
model=self._model,
contents=self._curated_history + [input_content],
config=self._config,
):
if _validate_response(chunk):
output_contents.append(chunk.candidates[0].content)
if chunk.candidates and chunk.candidates[0].finish_reason:
finish_reason = chunk.candidates[0].finish_reason
yield chunk
if output_contents and finish_reason:
self._curated_history.append(input_content)
self._curated_history.extend(output_contents)
class AsyncChats:
"""A util class to create async chat sessions."""
def __init__(self, modules: AsyncModels):
self._modules = modules
def create(
self,
*,
model: str,
config: GenerateContentConfigOrDict = None,
history: Optional[list[Content]] = None,
) -> AsyncChat:
"""Creates a new chat session.
Args:
model: The model to use for the chat.
config: The configuration to use for the generate content request.
history: The history to use for the chat.
Returns:
A new chat session.
"""
return AsyncChat(
modules=self._modules,
model=model,
config=config,
history=history if history else [],
)
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