/usr/lib/python2.7/dist-packages/livestreamer/cache.py is in python-livestreamer 1.10.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | import json
import os
import shutil
import tempfile
from time import time
from .compat import is_win32
if is_win32:
xdg_cache = os.environ.get("APPDATA",
os.path.expanduser("~"))
else:
xdg_cache = os.environ.get("XDG_CACHE_HOME",
os.path.expanduser("~/.cache"))
cache_dir = os.path.join(xdg_cache, "livestreamer")
class Cache(object):
"""Caches Python values as JSON and prunes expired entries."""
def __init__(self, filename, key_prefix=""):
self.key_prefix = key_prefix
self.filename = os.path.join(cache_dir, filename)
self._cache = {}
def _load(self):
if os.path.exists(self.filename):
try:
with open(self.filename, "r") as fd:
self._cache = json.load(fd)
except:
self._cache = {}
else:
self._cache = {}
def _prune(self):
now = time()
pruned = []
for key, value in self._cache.items():
expires = value.get("expires", time())
if expires <= now:
pruned.append(key)
for key in pruned:
self._cache.pop(key, None)
return len(pruned) > 0
def _save(self):
fd, tempname = tempfile.mkstemp()
fd = os.fdopen(fd, "w")
json.dump(self._cache, fd, indent=2, separators=(",", ": "))
fd.close()
# Silently ignore errors
try:
if not os.path.exists(os.path.dirname(self.filename)):
os.makedirs(os.path.dirname(self.filename))
shutil.move(tempname, self.filename)
except (IOError, OSError):
os.remove(tempname)
def set(self, key, value, expires=60 * 60 * 24 * 7):
self._load()
self._prune()
if self.key_prefix:
key = "{0}:{1}".format(self.key_prefix, key)
expires += time()
self._cache[key] = dict(value=value, expires=expires)
self._save()
def get(self, key, default=None):
self._load()
if self._prune():
self._save()
if self.key_prefix:
key = "{0}:{1}".format(self.key_prefix, key)
if key in self._cache and "value" in self._cache[key]:
return self._cache[key]["value"]
else:
return default
__all__ = ["Cache"]
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