Source code for fsspec.implementations.memory

from __future__ import absolute_import, division, print_function

import logging
from datetime import datetime
from errno import ENOTEMPTY
from io import BytesIO

from fsspec import AbstractFileSystem

logger = logging.Logger("fsspec.memoryfs")

[docs]class MemoryFileSystem(AbstractFileSystem): """A filesystem based on a dict of BytesIO objects This is a global filesystem so instances of this class all point to the same in memory filesystem. """ store = {} # global, do not overwrite! pseudo_dirs = [""] # global, do not overwrite! protocol = "memory" root_marker = "/" @classmethod def _strip_protocol(cls, path): if path.startswith("memory://"): path = path[len("memory://") :] if "::" in path or "://" in path: return path.rstrip("/") path = path.lstrip("/").rstrip("/") return "/" + path if path else "" def ls(self, path, detail=False, **kwargs): path = self._strip_protocol(path) if path in # there is a key with this exact name return [ { "name": path, "size":[path].size, "type": "file", "created":[path].created.timestamp(), } ] paths = set() starter = path + "/" out = [] for p2 in tuple( if p2.startswith(starter): if "/" not in p2[len(starter) :]: # exact child out.append( { "name": p2, "size":[p2].size, "type": "file", "created":[p2].created.timestamp(), } ) elif len(p2) > len(starter): # implied child directory ppath = starter + p2[len(starter) :].split("/", 1)[0] if ppath not in paths: out = out or [] out.append( { "name": ppath, "size": 0, "type": "directory", } ) paths.add(ppath) for p2 in self.pseudo_dirs: if p2.startswith(starter): if "/" not in p2[len(starter) :]: # exact child pdir if p2 not in paths: out.append({"name": p2, "size": 0, "type": "directory"}) paths.add(p2) else: # directory implied by deeper pdir ppath = starter + p2[len(starter) :].split("/", 1)[0] if ppath not in paths: out.append({"name": ppath, "size": 0, "type": "directory"}) paths.add(ppath) if not out: if path in self.pseudo_dirs: # empty dir return [] raise FileNotFoundError(path) if detail: return out return sorted([f["name"] for f in out]) def mkdir(self, path, create_parents=True, **kwargs): path = self._strip_protocol(path) if path in or path in self.pseudo_dirs: raise FileExistsError(path) if self._parent(path).strip("/") and self.isfile(self._parent(path)): raise NotADirectoryError(self._parent(path)) if create_parents and self._parent(path).strip("/"): try: self.mkdir(self._parent(path), create_parents, **kwargs) except FileExistsError: pass if path and path not in self.pseudo_dirs: self.pseudo_dirs.append(path) def makedirs(self, path, exist_ok=False): try: self.mkdir(path, create_parents=True) except FileExistsError: if not exist_ok: raise def pipe_file(self, path, value, **kwargs): """Set the bytes of given file Avoids copies of the data if possible """, "wb", data=value) def rmdir(self, path): path = self._strip_protocol(path) if path == "": # silently avoid deleting FS root return if path in self.pseudo_dirs: if not self.pseudo_dirs.remove(path) else: raise OSError(ENOTEMPTY, "Directory not empty", path) else: raise FileNotFoundError(path) def exists(self, path, **kwargs): path = self._strip_protocol(path) return path in or path in self.pseudo_dirs def info(self, path, **kwargs): path = self._strip_protocol(path) if path in self.pseudo_dirs or any( p.startswith(path + "/") for p in list( + self.pseudo_dirs ): return { "name": path, "size": 0, "type": "directory", } elif path in filelike =[path] return { "name": path, "size": filelike.size, "type": "file", "created": getattr(filelike, "created", None), } else: raise FileNotFoundError(path) def _open( self, path, mode="rb", block_size=None, autocommit=True, cache_options=None, **kwargs, ): path = self._strip_protocol(path) if path in self.pseudo_dirs: raise IsADirectoryError(path) parent = path while len(parent) > 1: parent = self._parent(parent) if self.isfile(parent): raise FileExistsError(parent) if mode in ["rb", "ab", "rb+"]: if path in f =[path] if mode == "ab": # position at the end of file, 2) else: # position at the beginning of file return f else: raise FileNotFoundError(path) if mode == "wb": m = MemoryFile(self, path, kwargs.get("data")) if not self._intrans: m.commit() return m def cp_file(self, path1, path2, **kwargs): path1 = self._strip_protocol(path1) path2 = self._strip_protocol(path2) if self.isfile(path1):[path2] = MemoryFile( self, path2,[path1].getvalue() ) # implicit copy elif self.isdir(path1): if path2 not in self.pseudo_dirs: self.pseudo_dirs.append(path2) else: raise FileNotFoundError(path1) def cat_file(self, path, start=None, end=None, **kwargs): path = self._strip_protocol(path) try: return bytes([path].getbuffer()[start:end]) except KeyError: raise FileNotFoundError(path) def _rm(self, path): path = self._strip_protocol(path) try: del[path] except KeyError as e: raise FileNotFoundError(path) from e def modified(self, path): path = self._strip_protocol(path) try: return[path].modified except KeyError: raise FileNotFoundError(path) def created(self, path): path = self._strip_protocol(path) try: return[path].created except KeyError: raise FileNotFoundError(path) def rm(self, path, recursive=False, maxdepth=None): if isinstance(path, str): path = self._strip_protocol(path) else: path = [self._strip_protocol(p) for p in path] paths = self.expand_path(path, recursive=recursive, maxdepth=maxdepth) for p in reversed(paths): # If the expanded path doesn't exist, it is only because the expanded # path was a directory that does not exist in self.pseudo_dirs. This # is possible if you directly create files without making the # directories first. if not self.exists(p): continue if self.isfile(p): self.rm_file(p) else: self.rmdir(p)
class MemoryFile(BytesIO): """A BytesIO which can't close and works as a context manager Can initialise with data. Each path should only be active once at any moment. No need to provide fs, path if auto-committing (default) """ def __init__(self, fs=None, path=None, data=None): logger.debug("open file %s", path) self.fs = fs self.path = path self.created = datetime.utcnow() self.modified = datetime.utcnow() if data: super().__init__(data) @property def size(self): return self.getbuffer().nbytes def __enter__(self): return self def close(self): pass def discard(self): pass def commit(self):[self.path] = self self.modified = datetime.utcnow()