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87 lines
3.3 KiB
Python
87 lines
3.3 KiB
Python
"""
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Module for fetching the HTML node
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"""
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from typing import List
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from langchain_community.document_loaders import AsyncHtmlLoader
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from langchain_core.documents import Document
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from .base_node import BaseNode
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from ..utils.remover import remover
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class FetchNode(BaseNode):
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"""
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A node responsible for fetching the HTML content of a specified URL and updating
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the graph's state with this content. It uses the AsyncHtmlLoader for asynchronous
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document loading.
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This node acts as a starting point in many scraping workflows, preparing the state
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with the necessary HTML content for further processing by subsequent nodes in the graph.
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Attributes:
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node_name (str): The unique identifier name for the node.
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node_type (str): The type of the node, defaulting to "node". This categorization
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helps in determining the node's role and behavior within the graph.
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The "node" type is used for standard operational nodes.
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Args:
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node_name (str): The unique identifier name for the node. This name is used to
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reference the node within the graph.
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node_type (str, optional): The type of the node, limited to "node" or
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"conditional_node". Defaults to "node".
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Methods:
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execute(state): Fetches the HTML content for the URL specified in the state and
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updates the state with this content under the 'document' key.
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The 'url' key must be present in the state for the operation
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to succeed.
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"""
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def __init__(self, input: str, output: List[str], node_name: str = "Fetch"):
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"""
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Initializes the FetchHTMLNode with a node name and node type.
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Arguments:
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node_name (str): name of the node
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"""
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super().__init__(node_name, "node", input, output, 1)
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def execute(self, state):
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"""
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Executes the node's logic to fetch HTML content from a specified URL and
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update the state with this content.
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Args:
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state (dict): The current state of the graph, expected to contain a 'url' key.
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Returns:
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dict: The updated state with a new 'document' key containing the fetched HTML content.
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Raises:
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KeyError: If the 'url' key is not found in the state, indicating that the
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necessary information to perform the operation is missing.
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"""
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print(f"--- Executing {self.node_name} Node ---")
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# Interpret input keys based on the provided input expression
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input_keys = self.get_input_keys(state)
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# Fetching data from the state based on the input keys
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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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# if it is a local directory
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if not source.startswith("http"):
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compressedDocument = [Document(page_content=remover(source), metadata={
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"source": "local_dir"
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})]
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# if it is a URL
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else:
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loader = AsyncHtmlLoader(source)
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document = loader.load()
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compressedDocument = [Document(page_content=remover(str(document)))]
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state.update({self.output[0]: compressedDocument})
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return state
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