Source code for langchain.chat_models.google_palm
"""Wrapper around Google's PaLM Chat API."""
from __future__ import annotations
import logging
from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional
from tenacity import (
    before_sleep_log,
    retry,
    retry_if_exception_type,
    stop_after_attempt,
    wait_exponential,
)
from langchain.callbacks.manager import (
    AsyncCallbackManagerForLLMRun,
    CallbackManagerForLLMRun,
)
from langchain.chat_models.base import BaseChatModel
from langchain.pydantic_v1 import BaseModel, root_validator
from langchain.schema import (
    ChatGeneration,
    ChatResult,
)
from langchain.schema.messages import (
    AIMessage,
    BaseMessage,
    ChatMessage,
    HumanMessage,
    SystemMessage,
)
from langchain.utils import get_from_dict_or_env
if TYPE_CHECKING:
    import google.generativeai as genai
logger = logging.getLogger(__name__)
[docs]class ChatGooglePalmError(Exception):
    """Error with the `Google PaLM` API."""
def _truncate_at_stop_tokens(
    text: str,
    stop: Optional[List[str]],
) -> str:
    """Truncates text at the earliest stop token found."""
    if stop is None:
        return text
    for stop_token in stop:
        stop_token_idx = text.find(stop_token)
        if stop_token_idx != -1:
            text = text[:stop_token_idx]
    return text
def _response_to_result(
    response: genai.types.ChatResponse,
    stop: Optional[List[str]],
) -> ChatResult:
    """Converts a PaLM API response into a LangChain ChatResult."""