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| import array | |
| import logging | |
| import posixpath | |
| import warnings | |
| from collections.abc import MutableMapping | |
| from functools import cached_property | |
| from fsspec.core import url_to_fs | |
| logger = logging.getLogger("fsspec.mapping") | |
| class FSMap(MutableMapping): | |
| """Wrap a FileSystem instance as a mutable wrapping. | |
| The keys of the mapping become files under the given root, and the | |
| values (which must be bytes) the contents of those files. | |
| Parameters | |
| ---------- | |
| root: string | |
| prefix for all the files | |
| fs: FileSystem instance | |
| check: bool (=True) | |
| performs a touch at the location, to check for write access. | |
| Examples | |
| -------- | |
| >>> fs = FileSystem(**parameters) # doctest: +SKIP | |
| >>> d = FSMap('my-data/path/', fs) # doctest: +SKIP | |
| or, more likely | |
| >>> d = fs.get_mapper('my-data/path/') | |
| >>> d['loc1'] = b'Hello World' # doctest: +SKIP | |
| >>> list(d.keys()) # doctest: +SKIP | |
| ['loc1'] | |
| >>> d['loc1'] # doctest: +SKIP | |
| b'Hello World' | |
| """ | |
| def __init__(self, root, fs, check=False, create=False, missing_exceptions=None): | |
| self.fs = fs | |
| self.root = fs._strip_protocol(root) | |
| self._root_key_to_str = fs._strip_protocol(posixpath.join(root, "x"))[:-1] | |
| if missing_exceptions is None: | |
| missing_exceptions = ( | |
| FileNotFoundError, | |
| IsADirectoryError, | |
| NotADirectoryError, | |
| ) | |
| self.missing_exceptions = missing_exceptions | |
| self.check = check | |
| self.create = create | |
| if create: | |
| if not self.fs.exists(root): | |
| self.fs.mkdir(root) | |
| if check: | |
| if not self.fs.exists(root): | |
| raise ValueError( | |
| f"Path {root} does not exist. Create " | |
| f" with the ``create=True`` keyword" | |
| ) | |
| self.fs.touch(root + "/a") | |
| self.fs.rm(root + "/a") | |
| def dirfs(self): | |
| """dirfs instance that can be used with the same keys as the mapper""" | |
| from .implementations.dirfs import DirFileSystem | |
| return DirFileSystem(path=self._root_key_to_str, fs=self.fs) | |
| def clear(self): | |
| """Remove all keys below root - empties out mapping""" | |
| logger.info("Clear mapping at %s", self.root) | |
| try: | |
| self.fs.rm(self.root, True) | |
| self.fs.mkdir(self.root) | |
| except: # noqa: E722 | |
| pass | |
| def getitems(self, keys, on_error="raise"): | |
| """Fetch multiple items from the store | |
| If the backend is async-able, this might proceed concurrently | |
| Parameters | |
| ---------- | |
| keys: list(str) | |
| They keys to be fetched | |
| on_error : "raise", "omit", "return" | |
| If raise, an underlying exception will be raised (converted to KeyError | |
| if the type is in self.missing_exceptions); if omit, keys with exception | |
| will simply not be included in the output; if "return", all keys are | |
| included in the output, but the value will be bytes or an exception | |
| instance. | |
| Returns | |
| ------- | |
| dict(key, bytes|exception) | |
| """ | |
| keys2 = [self._key_to_str(k) for k in keys] | |
| oe = on_error if on_error == "raise" else "return" | |
| try: | |
| out = self.fs.cat(keys2, on_error=oe) | |
| if isinstance(out, bytes): | |
| out = {keys2[0]: out} | |
| except self.missing_exceptions as e: | |
| raise KeyError from e | |
| out = { | |
| k: (KeyError() if isinstance(v, self.missing_exceptions) else v) | |
| for k, v in out.items() | |
| } | |
| return { | |
| key: out[k2] | |
| for key, k2 in zip(keys, keys2) | |
| if on_error == "return" or not isinstance(out[k2], BaseException) | |
| } | |
| def setitems(self, values_dict): | |
| """Set the values of multiple items in the store | |
| Parameters | |
| ---------- | |
| values_dict: dict(str, bytes) | |
| """ | |
| values = {self._key_to_str(k): maybe_convert(v) for k, v in values_dict.items()} | |
| self.fs.pipe(values) | |
| def delitems(self, keys): | |
| """Remove multiple keys from the store""" | |
| self.fs.rm([self._key_to_str(k) for k in keys]) | |
| def _key_to_str(self, key): | |
| """Generate full path for the key""" | |
| if not isinstance(key, str): | |
| # raise TypeError("key must be of type `str`, got `{type(key).__name__}`" | |
| warnings.warn( | |
| "from fsspec 2023.5 onward FSMap non-str keys will raise TypeError", | |
| DeprecationWarning, | |
| ) | |
| if isinstance(key, list): | |
| key = tuple(key) | |
| key = str(key) | |
| return f"{self._root_key_to_str}{key}".rstrip("/") | |
| def _str_to_key(self, s): | |
| """Strip path of to leave key name""" | |
| return s[len(self.root) :].lstrip("/") | |
| def __getitem__(self, key, default=None): | |
| """Retrieve data""" | |
| k = self._key_to_str(key) | |
| try: | |
| result = self.fs.cat(k) | |
| except self.missing_exceptions: | |
| if default is not None: | |
| return default | |
| raise KeyError(key) | |
| return result | |
| def pop(self, key, default=None): | |
| """Pop data""" | |
| result = self.__getitem__(key, default) | |
| try: | |
| del self[key] | |
| except KeyError: | |
| pass | |
| return result | |
| def __setitem__(self, key, value): | |
| """Store value in key""" | |
| key = self._key_to_str(key) | |
| self.fs.mkdirs(self.fs._parent(key), exist_ok=True) | |
| self.fs.pipe_file(key, maybe_convert(value)) | |
| def __iter__(self): | |
| return (self._str_to_key(x) for x in self.fs.find(self.root)) | |
| def __len__(self): | |
| return len(self.fs.find(self.root)) | |
| def __delitem__(self, key): | |
| """Remove key""" | |
| try: | |
| self.fs.rm(self._key_to_str(key)) | |
| except: # noqa: E722 | |
| raise KeyError | |
| def __contains__(self, key): | |
| """Does key exist in mapping?""" | |
| path = self._key_to_str(key) | |
| return self.fs.isfile(path) | |
| def __reduce__(self): | |
| return FSMap, (self.root, self.fs, False, False, self.missing_exceptions) | |
| def maybe_convert(value): | |
| if isinstance(value, array.array) or hasattr(value, "__array__"): | |
| # bytes-like things | |
| if hasattr(value, "dtype") and value.dtype.kind in "Mm": | |
| # The buffer interface doesn't support datetime64/timdelta64 numpy | |
| # arrays | |
| value = value.view("int64") | |
| value = bytes(memoryview(value)) | |
| return value | |
| def get_mapper( | |
| url="", | |
| check=False, | |
| create=False, | |
| missing_exceptions=None, | |
| alternate_root=None, | |
| **kwargs, | |
| ): | |
| """Create key-value interface for given URL and options | |
| The URL will be of the form "protocol://location" and point to the root | |
| of the mapper required. All keys will be file-names below this location, | |
| and their values the contents of each key. | |
| Also accepts compound URLs like zip::s3://bucket/file.zip , see ``fsspec.open``. | |
| Parameters | |
| ---------- | |
| url: str | |
| Root URL of mapping | |
| check: bool | |
| Whether to attempt to read from the location before instantiation, to | |
| check that the mapping does exist | |
| create: bool | |
| Whether to make the directory corresponding to the root before | |
| instantiating | |
| missing_exceptions: None or tuple | |
| If given, these exception types will be regarded as missing keys and | |
| return KeyError when trying to read data. By default, you get | |
| (FileNotFoundError, IsADirectoryError, NotADirectoryError) | |
| alternate_root: None or str | |
| In cases of complex URLs, the parser may fail to pick the correct part | |
| for the mapper root, so this arg can override | |
| Returns | |
| ------- | |
| ``FSMap`` instance, the dict-like key-value store. | |
| """ | |
| # Removing protocol here - could defer to each open() on the backend | |
| fs, urlpath = url_to_fs(url, **kwargs) | |
| root = alternate_root if alternate_root is not None else urlpath | |
| return FSMap(root, fs, check, create, missing_exceptions=missing_exceptions) | |