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412 lines
13 KiB
412 lines
13 KiB
from __future__ import annotations
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import inspect
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import logging
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import os
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import shutil
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import uuid
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from typing import Optional
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from .asyn import AsyncFileSystem, _run_coros_in_chunks, sync_wrapper
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from .callbacks import DEFAULT_CALLBACK
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from .core import filesystem, get_filesystem_class, split_protocol, url_to_fs
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_generic_fs = {}
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logger = logging.getLogger("fsspec.generic")
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def set_generic_fs(protocol, **storage_options):
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_generic_fs[protocol] = filesystem(protocol, **storage_options)
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default_method = "default"
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def _resolve_fs(url, method=None, protocol=None, storage_options=None):
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"""Pick instance of backend FS"""
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method = method or default_method
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protocol = protocol or split_protocol(url)[0]
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storage_options = storage_options or {}
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if method == "default":
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return filesystem(protocol)
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if method == "generic":
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return _generic_fs[protocol]
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if method == "current":
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cls = get_filesystem_class(protocol)
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return cls.current()
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if method == "options":
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fs, _ = url_to_fs(url, **storage_options.get(protocol, {}))
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return fs
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raise ValueError(f"Unknown FS resolution method: {method}")
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def rsync(
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source,
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destination,
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delete_missing=False,
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source_field="size",
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dest_field="size",
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update_cond="different",
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inst_kwargs=None,
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fs=None,
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**kwargs,
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):
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"""Sync files between two directory trees
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(experimental)
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Parameters
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----------
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source: str
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Root of the directory tree to take files from. This must be a directory, but
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do not include any terminating "/" character
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destination: str
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Root path to copy into. The contents of this location should be
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identical to the contents of ``source`` when done. This will be made a
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directory, and the terminal "/" should not be included.
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delete_missing: bool
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If there are paths in the destination that don't exist in the
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source and this is True, delete them. Otherwise, leave them alone.
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source_field: str | callable
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If ``update_field`` is "different", this is the key in the info
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of source files to consider for difference. Maybe a function of the
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info dict.
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dest_field: str | callable
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If ``update_field`` is "different", this is the key in the info
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of destination files to consider for difference. May be a function of
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the info dict.
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update_cond: "different"|"always"|"never"
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If "always", every file is copied, regardless of whether it exists in
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the destination. If "never", files that exist in the destination are
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not copied again. If "different" (default), only copy if the info
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fields given by ``source_field`` and ``dest_field`` (usually "size")
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are different. Other comparisons may be added in the future.
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inst_kwargs: dict|None
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If ``fs`` is None, use this set of keyword arguments to make a
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GenericFileSystem instance
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fs: GenericFileSystem|None
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Instance to use if explicitly given. The instance defines how to
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to make downstream file system instances from paths.
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Returns
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-------
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dict of the copy operations that were performed, {source: destination}
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"""
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fs = fs or GenericFileSystem(**(inst_kwargs or {}))
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source = fs._strip_protocol(source)
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destination = fs._strip_protocol(destination)
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allfiles = fs.find(source, withdirs=True, detail=True)
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if not fs.isdir(source):
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raise ValueError("Can only rsync on a directory")
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otherfiles = fs.find(destination, withdirs=True, detail=True)
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dirs = [
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a
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for a, v in allfiles.items()
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if v["type"] == "directory" and a.replace(source, destination) not in otherfiles
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]
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logger.debug(f"{len(dirs)} directories to create")
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if dirs:
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fs.make_many_dirs(
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[dirn.replace(source, destination) for dirn in dirs], exist_ok=True
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)
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allfiles = {a: v for a, v in allfiles.items() if v["type"] == "file"}
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logger.debug(f"{len(allfiles)} files to consider for copy")
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to_delete = [
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o
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for o, v in otherfiles.items()
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if o.replace(destination, source) not in allfiles and v["type"] == "file"
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]
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for k, v in allfiles.copy().items():
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otherfile = k.replace(source, destination)
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if otherfile in otherfiles:
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if update_cond == "always":
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allfiles[k] = otherfile
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elif update_cond == "different":
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inf1 = source_field(v) if callable(source_field) else v[source_field]
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v2 = otherfiles[otherfile]
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inf2 = dest_field(v2) if callable(dest_field) else v2[dest_field]
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if inf1 != inf2:
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# details mismatch, make copy
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allfiles[k] = otherfile
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else:
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# details match, don't copy
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allfiles.pop(k)
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else:
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# file not in target yet
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allfiles[k] = otherfile
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logger.debug(f"{len(allfiles)} files to copy")
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if allfiles:
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source_files, target_files = zip(*allfiles.items())
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fs.cp(source_files, target_files, **kwargs)
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logger.debug(f"{len(to_delete)} files to delete")
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if delete_missing and to_delete:
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fs.rm(to_delete)
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return allfiles
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class GenericFileSystem(AsyncFileSystem):
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"""Wrapper over all other FS types
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<experimental!>
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This implementation is a single unified interface to be able to run FS operations
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over generic URLs, and dispatch to the specific implementations using the URL
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protocol prefix.
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Note: instances of this FS are always async, even if you never use it with any async
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backend.
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"""
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protocol = "generic" # there is no real reason to ever use a protocol with this FS
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def __init__(self, default_method="default", **kwargs):
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"""
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Parameters
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----------
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default_method: str (optional)
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Defines how to configure backend FS instances. Options are:
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- "default": instantiate like FSClass(), with no
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extra arguments; this is the default instance of that FS, and can be
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configured via the config system
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- "generic": takes instances from the `_generic_fs` dict in this module,
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which you must populate before use. Keys are by protocol
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- "current": takes the most recently instantiated version of each FS
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"""
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self.method = default_method
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super().__init__(**kwargs)
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def _parent(self, path):
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fs = _resolve_fs(path, self.method)
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return fs.unstrip_protocol(fs._parent(path))
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def _strip_protocol(self, path):
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# normalization only
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fs = _resolve_fs(path, self.method)
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return fs.unstrip_protocol(fs._strip_protocol(path))
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async def _find(self, path, maxdepth=None, withdirs=False, detail=False, **kwargs):
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fs = _resolve_fs(path, self.method)
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if fs.async_impl:
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out = await fs._find(
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path, maxdepth=maxdepth, withdirs=withdirs, detail=True, **kwargs
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)
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else:
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out = fs.find(
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path, maxdepth=maxdepth, withdirs=withdirs, detail=True, **kwargs
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)
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result = {}
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for k, v in out.items():
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v = v.copy() # don't corrupt target FS dircache
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name = fs.unstrip_protocol(k)
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v["name"] = name
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result[name] = v
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if detail:
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return result
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return list(result)
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async def _info(self, url, **kwargs):
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fs = _resolve_fs(url, self.method)
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if fs.async_impl:
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out = await fs._info(url, **kwargs)
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else:
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out = fs.info(url, **kwargs)
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out = out.copy() # don't edit originals
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out["name"] = fs.unstrip_protocol(out["name"])
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return out
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async def _ls(
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self,
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url,
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detail=True,
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**kwargs,
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):
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fs = _resolve_fs(url, self.method)
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if fs.async_impl:
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out = await fs._ls(url, detail=True, **kwargs)
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else:
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out = fs.ls(url, detail=True, **kwargs)
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out = [o.copy() for o in out] # don't edit originals
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for o in out:
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o["name"] = fs.unstrip_protocol(o["name"])
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if detail:
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return out
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else:
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return [o["name"] for o in out]
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async def _cat_file(
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self,
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url,
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**kwargs,
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):
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fs = _resolve_fs(url, self.method)
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if fs.async_impl:
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return await fs._cat_file(url, **kwargs)
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else:
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return fs.cat_file(url, **kwargs)
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async def _pipe_file(
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self,
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path,
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value,
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**kwargs,
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):
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fs = _resolve_fs(path, self.method)
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if fs.async_impl:
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return await fs._pipe_file(path, value, **kwargs)
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else:
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return fs.pipe_file(path, value, **kwargs)
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async def _rm(self, url, **kwargs):
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urls = url
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if isinstance(urls, str):
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urls = [urls]
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fs = _resolve_fs(urls[0], self.method)
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if fs.async_impl:
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await fs._rm(urls, **kwargs)
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else:
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fs.rm(url, **kwargs)
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async def _makedirs(self, path, exist_ok=False):
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logger.debug("Make dir %s", path)
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fs = _resolve_fs(path, self.method)
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if fs.async_impl:
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await fs._makedirs(path, exist_ok=exist_ok)
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else:
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fs.makedirs(path, exist_ok=exist_ok)
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def rsync(self, source, destination, **kwargs):
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"""Sync files between two directory trees
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See `func:rsync` for more details.
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"""
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rsync(source, destination, fs=self, **kwargs)
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async def _cp_file(
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self,
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url,
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url2,
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blocksize=2**20,
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callback=DEFAULT_CALLBACK,
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**kwargs,
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):
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fs = _resolve_fs(url, self.method)
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fs2 = _resolve_fs(url2, self.method)
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if fs is fs2:
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# pure remote
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if fs.async_impl:
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return await fs._cp_file(url, url2, **kwargs)
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else:
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return fs.cp_file(url, url2, **kwargs)
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kw = {"blocksize": 0, "cache_type": "none"}
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try:
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f1 = (
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await fs.open_async(url, "rb")
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if hasattr(fs, "open_async")
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else fs.open(url, "rb", **kw)
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)
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callback.set_size(await maybe_await(f1.size))
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f2 = (
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await fs2.open_async(url2, "wb")
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if hasattr(fs2, "open_async")
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else fs2.open(url2, "wb", **kw)
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)
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while f1.size is None or f2.tell() < f1.size:
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data = await maybe_await(f1.read(blocksize))
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if f1.size is None and not data:
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break
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await maybe_await(f2.write(data))
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callback.absolute_update(f2.tell())
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finally:
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try:
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await maybe_await(f2.close())
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await maybe_await(f1.close())
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except NameError:
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# fail while opening f1 or f2
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pass
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async def _make_many_dirs(self, urls, exist_ok=True):
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fs = _resolve_fs(urls[0], self.method)
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if fs.async_impl:
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coros = [fs._makedirs(u, exist_ok=exist_ok) for u in urls]
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await _run_coros_in_chunks(coros)
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else:
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for u in urls:
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fs.makedirs(u, exist_ok=exist_ok)
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make_many_dirs = sync_wrapper(_make_many_dirs)
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async def _copy(
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self,
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path1: list[str],
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path2: list[str],
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recursive: bool = False,
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on_error: str = "ignore",
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maxdepth: Optional[int] = None,
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batch_size: Optional[int] = None,
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tempdir: Optional[str] = None,
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**kwargs,
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):
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if recursive:
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raise NotImplementedError
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fs = _resolve_fs(path1[0], self.method)
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fs2 = _resolve_fs(path2[0], self.method)
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# not expanding paths atm., assume call is from rsync()
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if fs is fs2:
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# pure remote
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if fs.async_impl:
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return await fs._copy(path1, path2, **kwargs)
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else:
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return fs.copy(path1, path2, **kwargs)
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await copy_file_op(
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fs, path1, fs2, path2, tempdir, batch_size, on_error=on_error
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)
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async def copy_file_op(
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fs1, url1, fs2, url2, tempdir=None, batch_size=20, on_error="ignore"
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):
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import tempfile
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tempdir = tempdir or tempfile.mkdtemp()
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try:
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coros = [
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_copy_file_op(
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fs1,
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u1,
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fs2,
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u2,
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os.path.join(tempdir, uuid.uuid4().hex),
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on_error=on_error,
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)
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for u1, u2 in zip(url1, url2)
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]
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await _run_coros_in_chunks(coros, batch_size=batch_size)
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finally:
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shutil.rmtree(tempdir)
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async def _copy_file_op(fs1, url1, fs2, url2, local, on_error="ignore"):
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ex = () if on_error == "raise" else Exception
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logger.debug("Copy %s -> %s", url1, url2)
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try:
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if fs1.async_impl:
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await fs1._get_file(url1, local)
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else:
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fs1.get_file(url1, local)
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if fs2.async_impl:
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await fs2._put_file(local, url2)
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else:
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fs2.put_file(local, url2)
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os.unlink(local)
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logger.debug("Copy %s -> %s; done", url1, url2)
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except ex as e:
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logger.debug("ignoring cp exception for %s: %s", url1, e)
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async def maybe_await(cor):
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if inspect.iscoroutine(cor):
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return await cor
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else:
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return cor
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