Spaces:
Runtime error
Runtime error
File size: 8,786 Bytes
ed4d993 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 |
"""Chain that makes API calls and summarizes the responses to answer a question."""
from __future__ import annotations
import json
from typing import Any, Dict, List, NamedTuple, Optional, cast
from langchain.chains.api.openapi.requests_chain import APIRequesterChain
from langchain.chains.api.openapi.response_chain import APIResponderChain
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain_core.callbacks import CallbackManagerForChainRun, Callbacks
from langchain_core.language_models import BaseLanguageModel
from langchain_core.pydantic_v1 import BaseModel, Field
from requests import Response
from langchain_community.tools.openapi.utils.api_models import APIOperation
from langchain_community.utilities.requests import Requests
class _ParamMapping(NamedTuple):
"""Mapping from parameter name to parameter value."""
query_params: List[str]
body_params: List[str]
path_params: List[str]
class OpenAPIEndpointChain(Chain, BaseModel):
"""Chain interacts with an OpenAPI endpoint using natural language."""
api_request_chain: LLMChain
api_response_chain: Optional[LLMChain]
api_operation: APIOperation
requests: Requests = Field(exclude=True, default_factory=Requests)
param_mapping: _ParamMapping = Field(alias="param_mapping")
return_intermediate_steps: bool = False
instructions_key: str = "instructions" #: :meta private:
output_key: str = "output" #: :meta private:
max_text_length: Optional[int] = Field(ge=0) #: :meta private:
@property
def input_keys(self) -> List[str]:
"""Expect input key.
:meta private:
"""
return [self.instructions_key]
@property
def output_keys(self) -> List[str]:
"""Expect output key.
:meta private:
"""
if not self.return_intermediate_steps:
return [self.output_key]
else:
return [self.output_key, "intermediate_steps"]
def _construct_path(self, args: Dict[str, str]) -> str:
"""Construct the path from the deserialized input."""
path = self.api_operation.base_url + self.api_operation.path
for param in self.param_mapping.path_params:
path = path.replace(f"{{{param}}}", str(args.pop(param, "")))
return path
def _extract_query_params(self, args: Dict[str, str]) -> Dict[str, str]:
"""Extract the query params from the deserialized input."""
query_params = {}
for param in self.param_mapping.query_params:
if param in args:
query_params[param] = args.pop(param)
return query_params
def _extract_body_params(self, args: Dict[str, str]) -> Optional[Dict[str, str]]:
"""Extract the request body params from the deserialized input."""
body_params = None
if self.param_mapping.body_params:
body_params = {}
for param in self.param_mapping.body_params:
if param in args:
body_params[param] = args.pop(param)
return body_params
def deserialize_json_input(self, serialized_args: str) -> dict:
"""Use the serialized typescript dictionary.
Resolve the path, query params dict, and optional requestBody dict.
"""
args: dict = json.loads(serialized_args)
path = self._construct_path(args)
body_params = self._extract_body_params(args)
query_params = self._extract_query_params(args)
return {
"url": path,
"data": body_params,
"params": query_params,
}
def _get_output(self, output: str, intermediate_steps: dict) -> dict:
"""Return the output from the API call."""
if self.return_intermediate_steps:
return {
self.output_key: output,
"intermediate_steps": intermediate_steps,
}
else:
return {self.output_key: output}
def _call(
self,
inputs: Dict[str, Any],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, str]:
_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
intermediate_steps = {}
instructions = inputs[self.instructions_key]
instructions = instructions[: self.max_text_length]
_api_arguments = self.api_request_chain.predict_and_parse(
instructions=instructions, callbacks=_run_manager.get_child()
)
api_arguments = cast(str, _api_arguments)
intermediate_steps["request_args"] = api_arguments
_run_manager.on_text(
api_arguments, color="green", end="\n", verbose=self.verbose
)
if api_arguments.startswith("ERROR"):
return self._get_output(api_arguments, intermediate_steps)
elif api_arguments.startswith("MESSAGE:"):
return self._get_output(
api_arguments[len("MESSAGE:") :], intermediate_steps
)
try:
request_args = self.deserialize_json_input(api_arguments)
method = getattr(self.requests, self.api_operation.method.value)
api_response: Response = method(**request_args)
if api_response.status_code != 200:
method_str = str(self.api_operation.method.value)
response_text = (
f"{api_response.status_code}: {api_response.reason}"
+ f"\nFor {method_str.upper()} {request_args['url']}\n"
+ f"Called with args: {request_args['params']}"
)
else:
response_text = api_response.text
except Exception as e:
response_text = f"Error with message {str(e)}"
response_text = response_text[: self.max_text_length]
intermediate_steps["response_text"] = response_text
_run_manager.on_text(
response_text, color="blue", end="\n", verbose=self.verbose
)
if self.api_response_chain is not None:
_answer = self.api_response_chain.predict_and_parse(
response=response_text,
instructions=instructions,
callbacks=_run_manager.get_child(),
)
answer = cast(str, _answer)
_run_manager.on_text(answer, color="yellow", end="\n", verbose=self.verbose)
return self._get_output(answer, intermediate_steps)
else:
return self._get_output(response_text, intermediate_steps)
@classmethod
def from_url_and_method(
cls,
spec_url: str,
path: str,
method: str,
llm: BaseLanguageModel,
requests: Optional[Requests] = None,
return_intermediate_steps: bool = False,
**kwargs: Any,
# TODO: Handle async
) -> "OpenAPIEndpointChain":
"""Create an OpenAPIEndpoint from a spec at the specified url."""
operation = APIOperation.from_openapi_url(spec_url, path, method)
return cls.from_api_operation(
operation,
requests=requests,
llm=llm,
return_intermediate_steps=return_intermediate_steps,
**kwargs,
)
@classmethod
def from_api_operation(
cls,
operation: APIOperation,
llm: BaseLanguageModel,
requests: Optional[Requests] = None,
verbose: bool = False,
return_intermediate_steps: bool = False,
raw_response: bool = False,
callbacks: Callbacks = None,
**kwargs: Any,
# TODO: Handle async
) -> "OpenAPIEndpointChain":
"""Create an OpenAPIEndpointChain from an operation and a spec."""
param_mapping = _ParamMapping(
query_params=operation.query_params,
body_params=operation.body_params,
path_params=operation.path_params,
)
requests_chain = APIRequesterChain.from_llm_and_typescript(
llm,
typescript_definition=operation.to_typescript(),
verbose=verbose,
callbacks=callbacks,
)
if raw_response:
response_chain = None
else:
response_chain = APIResponderChain.from_llm(
llm, verbose=verbose, callbacks=callbacks
)
_requests = requests or Requests()
return cls(
api_request_chain=requests_chain,
api_response_chain=response_chain,
api_operation=operation,
requests=_requests,
param_mapping=param_mapping,
verbose=verbose,
return_intermediate_steps=return_intermediate_steps,
callbacks=callbacks,
**kwargs,
)
|