"""Util that invokes the Passio Nutrition AI API."""
from datetime import datetime, timedelta
from typing import Any, Callable, Dict, Optional, final
import requests
from langchain_core.pydantic_v1 import BaseModel, Field, root_validator
from langchain_core.utils import get_from_dict_or_env
[docs]class NoDiskStorage:
"""Mixin to prevent storing on disk."""
@final
def __getstate__(self) -> None:
raise AttributeError("Do not store on disk.")
@final
def __setstate__(self, state: Any) -> None:
raise AttributeError("Do not store on disk.")
try:
from tenacity import (
retry,
retry_if_result,
stop_after_attempt,
wait_exponential,
wait_random,
)
except ImportError:
# No retries if tenacity is not installed.
def retry_fallback(
f: Callable[..., Any], *args: Any, **kwargs: Any
) -> Callable[..., Any]:
return f
def stop_after_attempt_fallback(n: int) -> None:
return None
def wait_random_fallback(a: float, b: float) -> None:
return None
def wait_exponential_fallback(
multiplier: float = 1, min: float = 0, max: float = float("inf")
) -> None:
return None
[docs]def is_http_retryable(rsp: requests.Response) -> bool:
"""Check if a HTTP response is retryable."""
return bool(rsp) and rsp.status_code in [408, 425, 429, 500, 502, 503, 504]
[docs]class ManagedPassioLifeAuth(NoDiskStorage):
"""Manage the token for the NutritionAI API."""
_access_token_expiry: Optional[datetime]
[docs] def __init__(self, subscription_key: str):
self.subscription_key = subscription_key
self._last_token = None
self._access_token_expiry = None
self._access_token = None
self._customer_id = None
@property
def headers(self) -> dict:
if not self.is_valid_now():
self.refresh_access_token()
return {
"Authorization": f"Bearer {self._access_token}",
"Passio-ID": self._customer_id,
}
[docs] def is_valid_now(self) -> bool:
return (
self._access_token is not None
and self._customer_id is not None
and self._access_token_expiry is not None
and self._access_token_expiry > datetime.now()
)
@retry(
retry=retry_if_result(is_http_retryable),
stop=stop_after_attempt(4),
wait=wait_random(0, 0.3) + wait_exponential(multiplier=1, min=0.1, max=2),
)
def _http_get(self, subscription_key: str) -> requests.Response:
return requests.get(
f"https://api.passiolife.com/v2/token-cache/napi/oauth/token/{subscription_key}"
)
[docs] def refresh_access_token(self) -> None:
"""Refresh the access token for the NutritionAI API."""
rsp = self._http_get(self.subscription_key)
if not rsp:
raise ValueError("Could not get access token")
self._last_token = token = rsp.json()
self._customer_id = token["customer_id"]
self._access_token = token["access_token"]
self._access_token_expiry = (
datetime.now()
+ timedelta(seconds=token["expires_in"])
- timedelta(seconds=5)
)
# 5 seconds: approximate time for a token refresh to be processed.
DEFAULT_NUTRITIONAI_API_URL = (
"https://api.passiolife.com/v2/products/napi/food/search/advanced"
)
[docs]class NutritionAIAPI(BaseModel):
"""Wrapper for the Passio Nutrition AI API."""
nutritionai_subscription_key: str
nutritionai_api_url: str = Field(default=DEFAULT_NUTRITIONAI_API_URL)
more_kwargs: dict = Field(default_factory=dict)
auth_: ManagedPassioLifeAuth
class Config:
arbitrary_types_allowed = True
extra = "forbid"
@retry(
retry=retry_if_result(is_http_retryable),
stop=stop_after_attempt(4),
wait=wait_random(0, 0.3) + wait_exponential(multiplier=1, min=0.1, max=2),
)
def _http_get(self, params: dict) -> requests.Response:
return requests.get(
self.nutritionai_api_url,
headers=self.auth_.headers,
params=params, # type: ignore
)
def _api_call_results(self, search_term: str) -> dict:
"""Call the NutritionAI API and return the results."""
rsp = self._http_get({"term": search_term, **self.more_kwargs})
if not rsp:
raise ValueError("Could not get NutritionAI API results")
rsp.raise_for_status()
return rsp.json()
@root_validator(pre=True)
def validate_environment(cls, values: Dict) -> Dict:
"""Validate that api key and endpoint exists in environment."""
nutritionai_subscription_key = get_from_dict_or_env(
values, "nutritionai_subscription_key", "NUTRITIONAI_SUBSCRIPTION_KEY"
)
values["nutritionai_subscription_key"] = nutritionai_subscription_key
nutritionai_api_url = get_from_dict_or_env(
values,
"nutritionai_api_url",
"NUTRITIONAI_API_URL",
DEFAULT_NUTRITIONAI_API_URL,
)
values["nutritionai_api_url"] = nutritionai_api_url
values["auth_"] = ManagedPassioLifeAuth(nutritionai_subscription_key)
return values
[docs] def run(self, query: str) -> Optional[Dict]:
"""Run query through NutrtitionAI API and parse result."""
results = self._api_call_results(query)
if results and len(results) < 1:
return None
return results
