mirror of
https://github.com/VinciGit00/Scrapegraph-ai.git
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215 lines
9.0 KiB
Python
215 lines
9.0 KiB
Python
from typing import List, Optional
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from .base_node import BaseNode
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from ..docloaders import ChromiumLoader
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from ..utils.cleanup_html import cleanup_html
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from ..utils.convert_to_md import convert_to_md
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from langchain_core.documents import Document
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from bs4 import BeautifulSoup
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from urllib.parse import quote, urljoin
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class FetchNodeLevelK(BaseNode):
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"""
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A node responsible for fetching the HTML content of a specified URL and all its sub-links
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recursively up to a certain level of hyperlink the graph. This content is then used to update
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the graph's state. It uses ChromiumLoader to fetch the content from a web page asynchronously
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(with proxy protection).
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Attributes:
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embedder_model: An optional model for embedding the fetched content.
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verbose (bool): A flag indicating whether to show print statements during execution.
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cache_path (str): Path to cache fetched content.
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headless (bool): Whether to run the Chromium browser in headless mode.
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loader_kwargs (dict): Additional arguments for the content loader.
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browser_base (dict): Optional configuration for the browser base API.
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depth (int): Maximum depth of hyperlink graph traversal.
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only_inside_links (bool): Whether to fetch only internal links.
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min_input_len (int): Minimum required length of input data.
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Args:
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input (str): Boolean expression defining the input keys needed from the state.
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output (List[str]): List of output keys to be updated in the state.
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node_config (dict): Additional configuration for the node.
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node_name (str): The unique identifier name for the node, defaulting to "FetchLevelK".
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"""
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def __init__(
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self,
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input: str,
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output: List[str],
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node_config: Optional[dict] = None,
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node_name: str = "FetchLevelK",
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):
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"""
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Initializes the FetchNodeLevelK instance.
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Args:
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input (str): Boolean expression defining the input keys needed from the state.
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output (List[str]): List of output keys to be updated in the state.
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node_config (Optional[dict]): Additional configuration for the node.
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node_name (str): The name of the node (default is "FetchLevelK").
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"""
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super().__init__(node_name, "node", input, output, 2, node_config)
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self.embedder_model = node_config.get("embedder_model", None)
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self.verbose = node_config.get("verbose", False) if node_config else False
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self.cache_path = node_config.get("cache_path", False)
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self.headless = node_config.get("headless", True) if node_config else True
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self.loader_kwargs = node_config.get("loader_kwargs", {}) if node_config else {}
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self.browser_base = node_config.get("browser_base", None)
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self.depth = node_config.get("depth", 1) if node_config else 1
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self.only_inside_links = node_config.get("only_inside_links", False) if node_config else False
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self.min_input_len = 1
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def execute(self, state: dict) -> dict:
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"""
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Executes the node's logic to fetch the HTML content of a specified URL and its sub-links
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recursively, then updates the graph's state with the fetched content.
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Args:
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state (dict): The current state of the graph.
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Returns:
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dict: The updated state with a new output key containing the fetched HTML content.
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Raises:
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KeyError: If the input key is not found in the state.
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"""
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self.logger.info(f"--- Executing {self.node_name} Node ---")
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input_keys = self.get_input_keys(state)
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input_data = [state[key] for key in input_keys]
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source = input_data[0]
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documents = [{"source": source}]
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loader_kwargs = self.node_config.get("loader_kwargs", {}) if self.node_config else {}
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for _ in range(self.depth):
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documents = self.obtain_content(documents, loader_kwargs)
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filtered_documents = [doc for doc in documents if 'document' in doc]
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state.update({self.output[0]: filtered_documents})
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return state
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def fetch_content(self, source: str, loader_kwargs) -> Optional[str]:
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"""
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Fetches the HTML content of a given source URL.
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Args:
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source (str): The URL to fetch content from.
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loader_kwargs (dict): Additional arguments for the content loader.
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Returns:
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Optional[str]: The fetched HTML content or None if fetching failed.
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"""
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self.logger.info(f"--- (Fetching HTML from: {source}) ---")
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if self.browser_base is not None:
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try:
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from ..docloaders.browser_base import browser_base_fetch
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except ImportError:
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raise ImportError("""The browserbase module is not installed.
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Please install it using `pip install browserbase`.""")
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data = browser_base_fetch(self.browser_base.get("api_key"),
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self.browser_base.get("project_id"), [source])
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document = [Document(page_content=content, metadata={"source": source}) for content in data]
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else:
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loader = ChromiumLoader([source], headless=self.headless, **loader_kwargs)
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document = loader.load()
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return document
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def extract_links(self, html_content: str) -> list:
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"""
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Extracts all hyperlinks from the HTML content.
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Args:
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html_content (str): The HTML content to extract links from.
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Returns:
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list: A list of extracted hyperlinks.
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"""
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soup = BeautifulSoup(html_content, 'html.parser')
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links = [link['href'] for link in soup.find_all('a', href=True)]
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self.logger.info(f"Extracted {len(links)} links.")
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return links
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def get_full_links(self, base_url: str, links: list) -> list:
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"""
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Converts relative URLs to full URLs based on the base URL.
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Args:
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base_url (str): The base URL for resolving relative links.
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links (list): A list of links to convert.
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Returns:
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list: A list of full URLs.
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"""
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full_links = []
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for link in links:
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if self.only_inside_links and link.startswith("http"):
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continue
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full_link = link if link.startswith("http") else urljoin(base_url, link)
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full_links.append(full_link)
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return full_links
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def obtain_content(self, documents: List, loader_kwargs) -> List:
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"""
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Iterates through documents, fetching and updating content recursively.
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Args:
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documents (List): A list of documents containing the source URLs.
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loader_kwargs (dict): Additional arguments for the content loader.
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Returns:
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List: The updated list of documents with fetched content.
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"""
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new_documents = []
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for doc in documents:
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source = doc['source']
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if 'document' not in doc:
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document = self.fetch_content(source, loader_kwargs)
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if not document or not document[0].page_content.strip():
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self.logger.warning(f"Failed to fetch content for {source}")
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documents.remove(doc)
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continue
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doc['document'] = document
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links = self.extract_links(doc['document'][0].page_content)
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full_links = self.get_full_links(source, links)
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for link in full_links:
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if not any(d.get('source', '') == link for d in documents) and not any(d.get('source', '') == link for d in new_documents):
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new_documents.append({"source": link})
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documents.extend(new_documents)
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return documents
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def process_links(self, base_url: str, links: list,
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loader_kwargs, depth: int, current_depth: int = 1) -> dict:
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"""
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Processes a list of links recursively up to a given depth.
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Args:
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base_url (str): The base URL for resolving relative links.
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links (list): A list of links to process.
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loader_kwargs (dict): Additional arguments for the content loader.
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depth (int): The maximum depth for recursion.
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current_depth (int): The current depth of recursion (default is 1).
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Returns:
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dict: A dictionary containing processed link content.
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"""
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content_dict = {}
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for idx, link in enumerate(links, start=1):
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full_link = link if link.startswith("http") else urljoin(base_url, link)
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self.logger.info(f"Processing link {idx}: {full_link}")
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link_content = self.fetch_content(full_link, loader_kwargs)
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if current_depth < depth:
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new_links = self.extract_links(link_content)
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content_dict.update(self.process_links(full_link, new_links, loader_kwargs, depth, current_depth + 1))
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else:
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self.logger.warning(f"Failed to fetch content for {full_link}")
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return content_dict
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