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87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
# Copyright 2023 LanceDB Developers
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from typing import Tuple
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from urllib.parse import urlparse
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import pyarrow.fs as pa_fs
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def get_uri_scheme(uri: str) -> str:
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"""
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Get the scheme of a URI. If the URI does not have a scheme, assume it is a file URI.
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Parameters
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----------
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uri : str
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The URI to parse.
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Returns
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-------
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str: The scheme of the URI.
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"""
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parsed = urlparse(uri)
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scheme = parsed.scheme
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if not scheme:
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scheme = "file"
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elif scheme in ["s3a", "s3n"]:
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scheme = "s3"
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elif len(scheme) == 1:
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# Windows drive names are parsed as the scheme
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# e.g. "c:\path" -> ParseResult(scheme="c", netloc="", path="/path", ...)
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# So we add special handling here for schemes that are a single character
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scheme = "file"
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return scheme
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def get_uri_location(uri: str) -> str:
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"""
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Get the location of a URI. If the parameter is not a url, assumes it is just a path
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Parameters
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----------
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uri : str
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The URI to parse.
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Returns
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-------
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str: Location part of the URL, without scheme
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"""
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parsed = urlparse(uri)
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if not parsed.netloc:
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return parsed.path
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else:
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return parsed.netloc + parsed.path
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def fs_from_uri(uri: str) -> Tuple[pa_fs.FileSystem, str]:
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"""
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Get a PyArrow FileSystem from a URI, handling extra environment variables.
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"""
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if get_uri_scheme(uri) == "s3":
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fs = pa_fs.S3FileSystem(endpoint_override=os.environ.get("AWS_ENDPOINT"))
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path = get_uri_location(uri)
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return fs, path
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return pa_fs.FileSystem.from_uri(uri)
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def safe_import_pandas():
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try:
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import pandas as pd
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return pd
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except ImportError:
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return None
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