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import inspect
import logging
from .asyn import AsyncFileSystem
from .callbacks import _DEFAULT_CALLBACK
from .core import filesystem, get_filesystem_class, split_protocol
_generic_fs = {}
logger = logging.getLogger("fsspec.generic")
def set_generic_fs(protocol, **storage_options):
_generic_fs[protocol] = filesystem(protocol, **storage_options)
default_method = "default"
def _resolve_fs(url, method=None, protocol=None, storage_options=None):
"""Pick instance of backend FS"""
method = method or default_method
protocol = protocol or split_protocol(url)[0]
storage_options = storage_options or {}
if method == "default":
return filesystem(protocol)
if method == "generic":
return _generic_fs[protocol]
if method == "current":
cls = get_filesystem_class(protocol)
return cls.current()
if method == "options":
return filesystem(protocol, **storage_options.get(protocol, {}))
raise ValueError(f"Unknown FS resolution method: {method}")
def rsync(
source,
destination,
delete_missing=False,
source_field="size",
dest_field="size",
update_cond="different",
inst_kwargs=None,
fs=None,
**kwargs,
):
"""Sync files between two directory trees
(experimental)
Parameters
----------
source: str
Root of the directory tree to take files from.
destination: str
Root path to copy into. The contents of this location should be
identical to the contents of ``source`` when done.
delete_missing: bool
If there are paths in the destination that don't exist in the
source and this is True, delete them. Otherwise, leave them alone.
source_field: str
If ``update_field`` is "different", this is the key in the info
of source files to consider for difference.
dest_field: str
If ``update_field`` is "different", this is the key in the info
of destination files to consider for difference.
update_cond: "different"|"always"|"never"
If "always", every file is copied, regardless of whether it exists in
the destination. If "never", files that exist in the destination are
not copied again. If "different" (default), only copy if the info
fields given by ``source_field`` and ``dest_field`` (usually "size")
are different. Other comparisons may be added in the future.
inst_kwargs: dict|None
If ``fs`` is None, use this set of keyword arguments to make a
GenericFileSystem instance
fs: GenericFileSystem|None
Instance to use if explicitly given. The instance defines how to
to make downstream file system instances from paths.
"""
fs = fs or GenericFileSystem(**(inst_kwargs or {}))
source = fs._strip_protocol(source)
destination = fs._strip_protocol(destination)
allfiles = fs.find(source, withdirs=True, detail=True)
if not fs.isdir(source):
raise ValueError("Can only rsync on a directory")
otherfiles = fs.find(destination, withdirs=True, detail=True)
dirs = [
a
for a, v in allfiles.items()
if v["type"] == "directory" and a.replace(source, destination) not in otherfiles
]
logger.debug(f"{len(dirs)} directories to create")
for dirn in dirs:
# no async
fs.mkdirs(dirn.replace(source, destination), exist_ok=True)
allfiles = {a: v for a, v in allfiles.items() if v["type"] == "file"}
logger.debug(f"{len(allfiles)} files to consider for copy")
to_delete = [
o
for o, v in otherfiles.items()
if o.replace(destination, source) not in allfiles and v["type"] == "file"
]
for k, v in allfiles.copy().items():
otherfile = k.replace(source, destination)
if otherfile in otherfiles:
if update_cond == "always":
allfiles[k] = otherfile
elif update_cond == "different":
if v[source_field] != otherfiles[otherfile][dest_field]:
# details mismatch, make copy
allfiles[k] = otherfile
else:
# details match, don't copy
allfiles.pop(k)
else:
# file not in target yet
allfiles[k] = otherfile
if allfiles:
source_files, target_files = zip(*allfiles.items())
logger.debug(f"{len(source_files)} files to copy")
fs.cp(source_files, target_files, **kwargs)
if delete_missing:
logger.debug(f"{len(to_delete)} files to delete")
fs.rm(to_delete)
class GenericFileSystem(AsyncFileSystem):
"""Wrapper over all other FS types
<experimental!>
This implementation is a single unified interface to be able to run FS operations
over generic URLs, and dispatch to the specific implementations using the URL
protocol prefix.
Note: instances of this FS are always async, even if you never use it with any async
backend.
"""
protocol = "generic" # there is no real reason to ever use a protocol with this FS
def __init__(self, default_method="default", **kwargs):
"""
Parameters
----------
default_method: str (optional)
Defines how to configure backend FS instances. Options are:
- "default": instantiate like FSClass(), with no
extra arguments; this is the default instance of that FS, and can be
configured via the config system
- "generic": takes instances from the `_generic_fs` dict in this module,
which you must populate before use. Keys are by protocol
- "current": takes the most recently instantiated version of each FS
"""
self.method = default_method
super(GenericFileSystem, self).__init__(**kwargs)
def _strip_protocol(self, path):
# normalization only
fs = _resolve_fs(path, self.method)
return fs.unstrip_protocol(fs._strip_protocol(path))
async def _find(self, path, maxdepth=None, withdirs=False, detail=False, **kwargs):
fs = _resolve_fs(path, self.method)
if fs.async_impl:
out = await fs._find(
path, maxdepth=maxdepth, withdirs=withdirs, detail=detail, **kwargs
)
else:
out = fs.find(
path, maxdepth=maxdepth, withdirs=withdirs, detail=detail, **kwargs
)
result = {}
for k, v in out.items():
name = fs.unstrip_protocol(k)
v["name"] = name
result[name] = v
if detail:
return result
return list(result)
async def _info(self, url, **kwargs):
fs = _resolve_fs(url, self.method)
if fs.async_impl:
out = await fs._info(url, **kwargs)
else:
out = fs.info(url, **kwargs)
out["name"] = fs.unstrip_protocol(out["name"])
return out
async def _ls(
self,
url,
detail=True,
**kwargs,
):
fs = _resolve_fs(url, self.method)
if fs.async_impl:
out = await fs._ls(url, detail=True, **kwargs)
else:
out = fs.ls(url, detail=True, **kwargs)
for o in out:
o["name"] = fs.unstrip_protocol(o["name"])
if detail:
return out
else:
return [o["name"] for o in out]
async def _cat_file(
self,
url,
**kwargs,
):
fs = _resolve_fs(url, self.method)
if fs.async_impl:
return await fs._cat_file(url, **kwargs)
else:
return fs.cat_file(url, **kwargs)
async def _pipe_file(
self,
path,
value,
**kwargs,
):
fs = _resolve_fs(path, self.method)
if fs.async_impl:
return await fs._pipe_file(path, value, **kwargs)
else:
return fs.pipe_file(path, value, **kwargs)
async def _rm(self, url, **kwargs):
fs = _resolve_fs(url, self.method)
if fs.async_impl:
await fs._rm(url, **kwargs)
else:
fs.rm(url, **kwargs)
async def _makedirs(self, path, exist_ok=False):
fs = _resolve_fs(path, self.method)
if fs.async_impl:
await fs._makedirs(path, exist_ok=exist_ok)
else:
fs.makedirs(path, exist_ok=exist_ok)
def rsync(self, source, destination, **kwargs):
"""Sync files between two directory trees
See `func:rsync` for more details.
"""
rsync(source, destination, fs=self, **kwargs)
async def _cp_file(
self,
url,
url2,
blocksize=2**20,
callback=_DEFAULT_CALLBACK,
**kwargs,
):
fs = _resolve_fs(url, self.method)
fs2 = _resolve_fs(url2, self.method)
if fs is fs2:
# pure remote
if fs.async_impl:
return await fs._cp_file(url, url2, **kwargs)
else:
return fs.cp_file(url, url2, **kwargs)
kw = {"blocksize": 0, "cache_type": "none"}
try:
f1 = (
await fs.open_async(url, "rb")
if hasattr(fs, "open_async")
else fs.open(url, "rb", **kw)
)
callback.set_size(await maybe_await(f1.size))
f2 = (
await fs2.open_async(url2, "wb")
if hasattr(fs2, "open_async")
else fs2.open(url2, "wb", **kw)
)
while f1.size is None or f2.tell() < f1.size:
data = await maybe_await(f1.read(blocksize))
if f1.size is None and not data:
break
await maybe_await(f2.write(data))
callback.absolute_update(f2.tell())
finally:
try:
await maybe_await(f2.close())
await maybe_await(f1.close())
except NameError:
# fail while opening f1 or f2
pass
async def maybe_await(cor):
if inspect.iscoroutine(cor):
return await cor
else:
return cor
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