from collections import namedtuple from glob import glob
from dlmanager import fs
File = namedtuple('File', ('path', 'stat'))
class PersistLimit(object): """
Keep a list of files, removing the oldest ones when the size_limit is reached.
The access time of a file is used to determine the oldests, e.g. the
last time a file was read.
:param size_limit: the size limit in bytes. A value of 0 means no limit.
:param file_limit: even if the size limit is reached, this force
to keep at least *file_limit* files. """ def __init__(self, size_limit, file_limit=5):
self.size_limit = size_limit
self.file_limit = file_limit
self.files = []
self._files_size = 0
def register_file(self, path): """
register a single file. """ try:
fstat = os.stat(path) except OSError: # file do not exists probably, just skip it # note this happen when backgound files are canceled return if stat.S_ISREG(fstat.st_mode):
self.files.append(File(path=path, stat=fstat))
self._files_size += fstat.st_size
def register_dir_content(self, directory, pattern="*"): """
Register every files in a directory that match *pattern*. """ for path in glob(os.path.join(directory, pattern)):
self.register_file(path)
def remove_old_files(self): """
remove oldest registered files. """ if self.size_limit <= 0 or self.file_limit <= 0: return # sort by creation time, oldest first
files = sorted(self.files, key=lambda f: f.stat.st_atime) while len(files) > self.file_limit and \
self._files_size >= self.size_limit:
f = files.pop(0)
fs.remove(f.path)
self._files_size -= f.stat.st_size
self.files = files
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