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largefilemanager.py
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largefilemanager.py
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import base64
import io
import os
from anyio.to_thread import run_sync
from tornado import web
from jupyter_server.services.contents.filemanager import AsyncFileContentsManager
from jupyter_server.services.contents.filemanager import FileContentsManager
class LargeFileManager(FileContentsManager):
"""Handle large file upload."""
def save(self, model, path=""):
"""Save the file model and return the model with no content."""
chunk = model.get("chunk", None)
if chunk is not None:
path = path.strip("/")
self.run_pre_save_hooks(model=model, path=path)
if "type" not in model:
raise web.HTTPError(400, "No file type provided")
if model["type"] != "file":
raise web.HTTPError(
400,
'File type "{}" is not supported for large file transfer'.format(model["type"]),
)
if "content" not in model and model["type"] != "directory":
raise web.HTTPError(400, "No file content provided")
os_path = self._get_os_path(path)
self.log.debug("Saving %s", os_path)
try:
if chunk == 1:
super(LargeFileManager, self)._save_file(
os_path, model["content"], model.get("format")
)
else:
self._save_large_file(os_path, model["content"], model.get("format"))
except web.HTTPError:
raise
except Exception as e:
self.log.error("Error while saving file: %s %s", path, e, exc_info=True)
raise web.HTTPError(
500, "Unexpected error while saving file: %s %s" % (path, e)
) from e
model = self.get(path, content=False)
# Last chunk
if chunk == -1:
self.run_post_save_hooks(model=model, os_path=os_path)
return model
else:
return super(LargeFileManager, self).save(model, path)
def _save_large_file(self, os_path, content, format):
"""Save content of a generic file."""
if format not in {"text", "base64"}:
raise web.HTTPError(
400,
"Must specify format of file contents as 'text' or 'base64'",
)
try:
if format == "text":
bcontent = content.encode("utf8")
else:
b64_bytes = content.encode("ascii")
bcontent = base64.b64decode(b64_bytes)
except Exception as e:
raise web.HTTPError(400, "Encoding error saving %s: %s" % (os_path, e)) from e
with self.perm_to_403(os_path):
if os.path.islink(os_path):
os_path = os.path.join(os.path.dirname(os_path), os.readlink(os_path))
with io.open(os_path, "ab") as f:
f.write(bcontent)
class AsyncLargeFileManager(AsyncFileContentsManager):
"""Handle large file upload asynchronously"""
async def save(self, model, path=""):
"""Save the file model and return the model with no content."""
chunk = model.get("chunk", None)
if chunk is not None:
path = path.strip("/")
os_path = self._get_os_path(path)
self.log.debug("Saving %s", os_path)
self.run_pre_save_hooks(model=model, path=path)
if "type" not in model:
raise web.HTTPError(400, "No file type provided")
if model["type"] != "file":
raise web.HTTPError(
400,
'File type "{}" is not supported for large file transfer'.format(model["type"]),
)
if "content" not in model and model["type"] != "directory":
raise web.HTTPError(400, "No file content provided")
try:
if chunk == 1:
await super(AsyncLargeFileManager, self)._save_file(
os_path, model["content"], model.get("format")
)
else:
await self._save_large_file(os_path, model["content"], model.get("format"))
except web.HTTPError:
raise
except Exception as e:
self.log.error("Error while saving file: %s %s", path, e, exc_info=True)
raise web.HTTPError(
500, "Unexpected error while saving file: %s %s" % (path, e)
) from e
model = await self.get(path, content=False)
# Last chunk
if chunk == -1:
self.run_post_save_hooks(model=model, os_path=os_path)
return model
else:
return await super(AsyncLargeFileManager, self).save(model, path)
async def _save_large_file(self, os_path, content, format):
"""Save content of a generic file."""
if format not in {"text", "base64"}:
raise web.HTTPError(
400,
"Must specify format of file contents as 'text' or 'base64'",
)
try:
if format == "text":
bcontent = content.encode("utf8")
else:
b64_bytes = content.encode("ascii")
bcontent = base64.b64decode(b64_bytes)
except Exception as e:
raise web.HTTPError(400, "Encoding error saving %s: %s" % (os_path, e)) from e
with self.perm_to_403(os_path):
if os.path.islink(os_path):
os_path = os.path.join(os.path.dirname(os_path), os.readlink(os_path))
with io.open(os_path, "ab") as f:
await run_sync(f.write, bcontent)