mirror of
https://github.com/hwchase17/langchain
synced 2024-11-02 09:40:22 +00:00
dc7c06bc07
Issue: When the third-party package is not installed, whenever we need to `pip install <package>` the ImportError is raised. But sometimes, the `ValueError` or `ModuleNotFoundError` is raised. It is bad for consistency. Change: replaced the `ValueError` or `ModuleNotFoundError` with `ImportError` when we raise an error with the `pip install <package>` message. Note: Ideally, we replace all `try: import... except... raise ... `with helper functions like `import_aim` or just use the existing [langchain_core.utils.utils.guard_import](https://api.python.langchain.com/en/latest/utils/langchain_core.utils.utils.guard_import.html#langchain_core.utils.utils.guard_import) But it would be much bigger refactoring. @baskaryan Please, advice on this.
75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
from typing import Any, Dict, List
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class HugeGraph:
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"""HugeGraph wrapper for graph operations.
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*Security note*: Make sure that the database connection uses credentials
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that are narrowly-scoped to only include necessary permissions.
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Failure to do so may result in data corruption or loss, since the calling
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code may attempt commands that would result in deletion, mutation
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of data if appropriately prompted or reading sensitive data if such
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data is present in the database.
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The best way to guard against such negative outcomes is to (as appropriate)
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limit the permissions granted to the credentials used with this tool.
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See https://python.langchain.com/docs/security for more information.
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"""
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def __init__(
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self,
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username: str = "default",
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password: str = "default",
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address: str = "127.0.0.1",
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port: int = 8081,
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graph: str = "hugegraph",
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) -> None:
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"""Create a new HugeGraph wrapper instance."""
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try:
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from hugegraph.connection import PyHugeGraph
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except ImportError:
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raise ImportError(
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"Please install HugeGraph Python client first: "
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"`pip3 install hugegraph-python`"
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)
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self.username = username
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self.password = password
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self.address = address
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self.port = port
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self.graph = graph
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self.client = PyHugeGraph(
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address, port, user=username, pwd=password, graph=graph
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)
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self.schema = ""
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# Set schema
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try:
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self.refresh_schema()
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except Exception as e:
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raise ValueError(f"Could not refresh schema. Error: {e}")
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@property
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def get_schema(self) -> str:
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"""Returns the schema of the HugeGraph database"""
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return self.schema
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def refresh_schema(self) -> None:
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"""
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Refreshes the HugeGraph schema information.
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"""
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schema = self.client.schema()
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vertex_schema = schema.getVertexLabels()
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edge_schema = schema.getEdgeLabels()
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relationships = schema.getRelations()
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self.schema = (
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f"Node properties: {vertex_schema}\n"
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f"Edge properties: {edge_schema}\n"
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f"Relationships: {relationships}\n"
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)
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def query(self, query: str) -> List[Dict[str, Any]]:
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g = self.client.gremlin()
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res = g.exec(query)
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return res["data"]
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