mirror of
https://github.com/hwchase17/langchain
synced 2024-11-10 01:10:59 +00:00
292 lines
10 KiB
Python
292 lines
10 KiB
Python
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"""Pebblo's safe dataloader is a wrapper for document loaders"""
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import logging
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import os
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import pwd
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import uuid
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from http import HTTPStatus
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from typing import Any, Dict, Iterator, List
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import requests
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from langchain_core.documents import Document
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from langchain_community.document_loaders.base import BaseLoader
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from langchain_community.utilities.pebblo import (
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CLASSIFIER_URL,
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PLUGIN_VERSION,
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App,
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Doc,
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get_full_path,
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get_loader_full_path,
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get_loader_type,
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get_runtime,
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)
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logger = logging.getLogger(__name__)
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class PebbloSafeLoader(BaseLoader):
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"""Pebblo Safe Loader class is a wrapper around document loaders enabling the data
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to be scrutinized.
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"""
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_discover_sent: bool = False
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_loader_sent: bool = False
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def __init__(
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self,
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langchain_loader: BaseLoader,
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name: str,
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owner: str = "",
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description: str = "",
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):
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if not name or not isinstance(name, str):
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raise NameError("Must specify a valid name.")
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self.app_name = name
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self.load_id = str(uuid.uuid4())
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self.loader = langchain_loader
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self.owner = owner
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self.description = description
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self.source_path = get_loader_full_path(self.loader)
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self.source_owner = PebbloSafeLoader.get_file_owner_from_path(self.source_path)
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self.docs: List[Document] = []
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loader_name = str(type(self.loader)).split(".")[-1].split("'")[0]
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self.source_type = get_loader_type(loader_name)
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self.source_path_size = self.get_source_size(self.source_path)
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self.source_aggr_size = 0
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self.loader_details = {
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"loader": loader_name,
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"source_path": self.source_path,
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"source_type": self.source_type,
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**(
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{"source_path_size": str(self.source_path_size)}
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if self.source_path_size > 0
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else {}
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),
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}
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# generate app
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self.app = self._get_app_details()
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self._send_discover()
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def load(self) -> List[Document]:
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"""Load Documents.
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Returns:
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list: Documents fetched from load method of the wrapped `loader`.
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"""
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self.docs = self.loader.load()
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self._send_loader_doc(loading_end=True)
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return self.docs
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def lazy_load(self) -> Iterator[Document]:
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"""Load documents in lazy fashion.
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Raises:
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NotImplementedError: raised when lazy_load id not implemented
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within wrapped loader.
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Yields:
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list: Documents from loader's lazy loading.
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"""
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try:
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doc_iterator = self.loader.lazy_load()
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except NotImplementedError as exc:
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err_str = f"{self.loader.__class__.__name__} does not implement lazy_load()"
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logger.error(err_str)
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raise NotImplementedError(err_str) from exc
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while True:
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try:
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doc = next(doc_iterator)
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except StopIteration:
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self.docs = []
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self._send_loader_doc(loading_end=True)
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break
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self.docs = [
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doc,
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]
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self._send_loader_doc()
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yield doc
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@classmethod
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def set_discover_sent(cls) -> None:
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cls._discover_sent = True
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@classmethod
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def set_loader_sent(cls) -> None:
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cls._loader_sent = True
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def _send_loader_doc(self, loading_end: bool = False) -> None:
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"""Send documents fetched from loader to pebblo-server. Internal method.
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Args:
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loading_end (bool, optional): Flag indicating the halt of data
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loading by loader. Defaults to False.
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"""
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headers = {"Accept": "application/json", "Content-Type": "application/json"}
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doc_content = [doc.dict() for doc in self.docs]
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docs = []
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for doc in doc_content:
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doc_source_path = get_full_path(doc.get("metadata", {}).get("source"))
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doc_source_owner = PebbloSafeLoader.get_file_owner_from_path(
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doc_source_path
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)
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doc_source_size = self.get_source_size(doc_source_path)
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page_content = str(doc.get("page_content"))
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page_content_size = self.calculate_content_size(page_content)
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self.source_aggr_size += page_content_size
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docs.append(
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{
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"doc": page_content,
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"source_path": doc_source_path,
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"last_modified": doc.get("metadata", {}).get("last_modified"),
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"file_owner": doc_source_owner,
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**(
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{"source_path_size": doc_source_size}
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if doc_source_size is not None
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else {}
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),
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}
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)
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payload: Dict[str, Any] = {
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"name": self.app_name,
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"owner": self.owner,
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"docs": docs,
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"plugin_version": PLUGIN_VERSION,
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"load_id": self.load_id,
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"loader_details": self.loader_details,
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"loading_end": "false",
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"source_owner": self.source_owner,
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}
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if loading_end is True:
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payload["loading_end"] = "true"
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if "loader_details" in payload:
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payload["loader_details"]["source_aggr_size"] = self.source_aggr_size
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payload = Doc(**payload).dict(exclude_unset=True)
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load_doc_url = f"{CLASSIFIER_URL}/v1/loader/doc"
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try:
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resp = requests.post(
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load_doc_url, headers=headers, json=payload, timeout=20
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)
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if resp.status_code not in [HTTPStatus.OK, HTTPStatus.BAD_GATEWAY]:
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logger.warning(
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f"Received unexpected HTTP response code: {resp.status_code}"
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)
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logger.debug(
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f"send_loader_doc: request \
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url {resp.request.url}, \
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body {str(resp.request.body)[:999]} \
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len {len(resp.request.body if resp.request.body else [])} \
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response status{resp.status_code} body {resp.json()}"
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)
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except requests.exceptions.RequestException:
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logger.warning("Unable to reach pebblo server.")
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except Exception:
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logger.warning("An Exception caught in _send_loader_doc.")
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if loading_end is True:
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PebbloSafeLoader.set_loader_sent()
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@staticmethod
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def calculate_content_size(page_content: str) -> int:
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"""Calculate the content size in bytes:
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- Encode the string to bytes using a specific encoding (e.g., UTF-8)
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- Get the length of the encoded bytes.
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Args:
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page_content (str): Data string.
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Returns:
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int: Size of string in bytes.
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"""
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# Encode the content to bytes using UTF-8
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encoded_content = page_content.encode("utf-8")
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size = len(encoded_content)
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return size
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def _send_discover(self) -> None:
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"""Send app discovery payload to pebblo-server. Internal method."""
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headers = {"Accept": "application/json", "Content-Type": "application/json"}
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payload = self.app.dict(exclude_unset=True)
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app_discover_url = f"{CLASSIFIER_URL}/v1/app/discover"
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try:
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resp = requests.post(
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app_discover_url, headers=headers, json=payload, timeout=20
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)
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logger.debug(
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f"send_discover: request \
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url {resp.request.url}, \
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headers {resp.request.headers}, \
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body {str(resp.request.body)[:999]} \
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len {len(resp.request.body if resp.request.body else [])} \
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response status{resp.status_code} body {resp.json()}"
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)
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if resp.status_code in [HTTPStatus.OK, HTTPStatus.BAD_GATEWAY]:
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PebbloSafeLoader.set_discover_sent()
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else:
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logger.warning(
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f"Received unexpected HTTP response code: {resp.status_code}"
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)
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except requests.exceptions.RequestException:
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logger.warning("Unable to reach pebblo server.")
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except Exception:
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logger.warning("An Exception caught in _send_discover.")
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def _get_app_details(self) -> App:
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"""Fetch app details. Internal method.
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Returns:
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App: App details.
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"""
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framework, runtime = get_runtime()
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app = App(
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name=self.app_name,
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owner=self.owner,
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description=self.description,
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load_id=self.load_id,
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runtime=runtime,
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framework=framework,
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plugin_version=PLUGIN_VERSION,
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)
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return app
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@staticmethod
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def get_file_owner_from_path(file_path: str) -> str:
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"""Fetch owner of local file path.
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Args:
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file_path (str): Local file path.
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Returns:
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str: Name of owner.
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"""
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try:
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file_owner_uid = os.stat(file_path).st_uid
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file_owner_name = pwd.getpwuid(file_owner_uid).pw_name
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except Exception:
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file_owner_name = "unknown"
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return file_owner_name
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def get_source_size(self, source_path: str) -> int:
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"""Fetch size of source path. Source can be a directory or a file.
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Args:
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source_path (str): Local path of data source.
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Returns:
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int: Source size in bytes.
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"""
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if not source_path:
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return 0
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size = 0
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if os.path.isfile(source_path):
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size = os.path.getsize(source_path)
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elif os.path.isdir(source_path):
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total_size = 0
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for dirpath, _, filenames in os.walk(source_path):
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for f in filenames:
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fp = os.path.join(dirpath, f)
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if not os.path.islink(fp):
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total_size += os.path.getsize(fp)
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size = total_size
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return size
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