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import base64
import io
import re
import requests
import fsspec
class JupyterFileSystem(fsspec.AbstractFileSystem):
"""View of the files as seen by a Jupyter server (notebook or lab)"""
protocol = ("jupyter", "jlab")
def __init__(self, url, tok=None, **kwargs):
"""
Parameters
----------
url : str
Base URL of the server, like "http://127.0.0.1:8888". May include
token in the string, which is given by the process when starting up
tok : str
If the token is obtained separately, can be given here
kwargs
"""
if "?" in url:
if tok is None:
try:
tok = re.findall("token=([a-z0-9]+)", url)[0]
except IndexError as e:
raise ValueError("Could not determine token") from e
url = url.split("?", 1)[0]
self.url = url.rstrip("/") + "/api/contents"
self.session = requests.Session()
if tok:
self.session.headers["Authorization"] = f"token {tok}"
super().__init__(**kwargs)
def ls(self, path, detail=True, **kwargs):
path = self._strip_protocol(path)
r = self.session.get(f"{self.url}/{path}")
if r.status_code == 404:
return FileNotFoundError(path)
r.raise_for_status()
out = r.json()
if out["type"] == "directory":
out = out["content"]
else:
out = [out]
for o in out:
o["name"] = o.pop("path")
o.pop("content")
if o["type"] == "notebook":
o["type"] = "file"
if detail:
return out
return [o["name"] for o in out]
def cat_file(self, path, start=None, end=None, **kwargs):
path = self._strip_protocol(path)
r = self.session.get(f"{self.url}/{path}")
if r.status_code == 404:
return FileNotFoundError(path)
r.raise_for_status()
out = r.json()
if out["format"] == "text":
# data should be binary
b = out["content"].encode()
else:
b = base64.b64decode(out["content"])
return b[start:end]
def pipe_file(self, path, value, **_):
path = self._strip_protocol(path)
json = {
"name": path.rsplit("/", 1)[-1],
"path": path,
"size": len(value),
"content": base64.b64encode(value).decode(),
"format": "base64",
"type": "file",
}
self.session.put(f"{self.url}/{path}", json=json)
def mkdir(self, path, create_parents=True, **kwargs):
path = self._strip_protocol(path)
if create_parents and "/" in path:
self.mkdir(path.rsplit("/", 1)[0], True)
json = {
"name": path.rsplit("/", 1)[-1],
"path": path,
"size": None,
"content": None,
"type": "directory",
}
self.session.put(f"{self.url}/{path}", json=json)
def _rm(self, path):
path = self._strip_protocol(path)
self.session.delete(f"{self.url}/{path}")
def _open(self, path, mode="rb", **kwargs):
path = self._strip_protocol(path)
if mode == "rb":
data = self.cat_file(path)
return io.BytesIO(data)
else:
return SimpleFileWriter(self, path, mode="wb")
class SimpleFileWriter(fsspec.spec.AbstractBufferedFile):
def _upload_chunk(self, final=False):
"""Never uploads a chunk until file is done
Not suitable for large files
"""
if final is False:
return False
self.buffer.seek(0)
data = self.buffer.read()
self.fs.pipe_file(self.path, data)
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