kopia lustrzana https://github.com/jupyterhub/repo2docker
106 wiersze
3.3 KiB
Python
106 wiersze
3.3 KiB
Python
from datetime import datetime, timedelta, timezone
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from os import path
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from urllib.parse import urlparse
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from requests import Session
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from .. import __version__
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from .base import ContentProvider
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class CKAN(ContentProvider):
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"""Provide contents of a remote CKAN dataset."""
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def __init__(self):
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super().__init__()
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self.session = Session()
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self.session.headers.update(
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{
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"user-agent": f"repo2docker {__version__}",
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}
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)
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def _fetch_version(self, api_url):
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"""Fetch dataset modified date and convert to epoch.
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Borrowed from the Hydroshare provider.
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"""
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package_show_url = f"{api_url}package_show?id={self.dataset_id}"
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resp = self.urlopen(package_show_url).json()
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date = resp["result"]["metadata_modified"]
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parsed_date = datetime.strptime(date, "%Y-%m-%dT%H:%M:%S.%f")
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epoch = parsed_date.replace(tzinfo=timezone(timedelta(0))).timestamp()
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# truncate the timestamp
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return str(int(epoch))
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def _request(self, url, **kwargs):
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return self.session.get(url, **kwargs)
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urlopen = _request
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def detect(self, source, ref=None, extra_args=None):
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"""Trigger this provider for things that resolve to a CKAN dataset."""
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parsed_url = urlparse(source)
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if not parsed_url.netloc:
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return None
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url_parts = parsed_url.path.split("/")
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if url_parts[-2] == "dataset":
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self.dataset_id = url_parts[-1]
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else:
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return None
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api_url_path = "/api/3/action/"
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api_url = parsed_url._replace(
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path="/".join(url_parts[:-2]) + api_url_path
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).geturl()
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status_show_url = f"{api_url}status_show"
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resp = self.urlopen(status_show_url)
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if resp.status_code == 200:
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self.version = self._fetch_version(api_url)
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return {
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"dataset_id": self.dataset_id,
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"api_url": api_url,
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"version": self.version,
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}
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else:
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return None
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def fetch(self, spec, output_dir, yield_output=False):
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"""Fetch a CKAN dataset."""
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dataset_id = spec["dataset_id"]
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yield f"Fetching CKAN dataset {dataset_id}.\n"
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package_show_url = f"{spec['api_url']}package_show?id={dataset_id}"
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resp = self.urlopen(
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package_show_url,
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headers={"accept": "application/json"},
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)
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dataset = resp.json()
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yield "Fetching CKAN resources.\n"
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resources = dataset["result"]["resources"]
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for resource in resources:
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file_url = resource["url"]
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fname = file_url.rsplit("/", maxsplit=1)[-1]
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if fname == "":
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fname = resource["id"]
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yield f"Requesting {file_url}\n"
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resp = self._request(file_url, stream=True)
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resp.raise_for_status()
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dst_fname = path.join(output_dir, fname)
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with open(dst_fname, "wb") as dst:
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yield f"Fetching {fname}\n"
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for chunk in resp.iter_content(chunk_size=None):
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dst.write(chunk)
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@property
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def content_id(self):
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"""A unique ID to represent the version of the content."""
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return f"{self.dataset_id}.v{self.version}"
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