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# Copyright (C) 2012-2013 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import json
import time
import shutil
import logging
from os.path import exists, join, isdir
from sugar_network import toolkit, client
from sugar_network.toolkit.bundle import Bundle
from sugar_network.toolkit import pipe, enforce
_logger = logging.getLogger('cache')
def recycle():
stat = os.statvfs(client.local_root.value)
total = stat.f_blocks * stat.f_frsize
free = stat.f_bfree * stat.f_frsize
to_free = client.cache_limit.value * total / 100 - free
ts = time.time()
__, items = _list()
for mtime, neg_size, path in items:
if to_free > 0:
shutil.rmtree(path, ignore_errors=True)
_logger.debug('Recycled %r to save %s bytes', path, -neg_size)
to_free += neg_size
elif mtime == 0:
shutil.rmtree(path, ignore_errors=True)
_logger.debug('Recycled malformed cache item %r', path)
elif client.cache_lifetime.value and \
client.cache_lifetime.value < (ts - mtime) / 86400.0:
shutil.rmtree(path, ignore_errors=True)
_logger.debug('Recycled stale %r to get %s bytes', path, -neg_size)
else:
break
def ensure(requested_size=0, temp_size=0):
stat = os.statvfs(client.local_root.value)
if stat.f_blocks == 0:
# TODO Sonds like a tmpfs or so
return
total = stat.f_blocks * stat.f_frsize
free = stat.f_bfree * stat.f_frsize
to_free = max(client.cache_limit.value * total / 100, temp_size) - \
(free - requested_size)
if to_free <= 0:
return
_logger.debug('Recycle %s bytes free=%d requested_size=%d temp_size=%d',
to_free, free, requested_size, temp_size)
cached_total, items = _list()
enforce(cached_total >= to_free, 'No free disk space')
for __, neg_size, path in items:
shutil.rmtree(path, ignore_errors=True)
_logger.debug('Recycled %r to save %s bytes', path, -neg_size)
to_free += neg_size
if to_free <= 0:
break
def get(guid, hints=None):
path = join(client.local_root.value, 'cache', 'implementation', guid)
if exists(path):
pipe.trace('Reuse cached %s implementation from %r', guid, path)
ts = time.time()
os.utime(path, (ts, ts))
return path
pipe.trace('Download %s implementation', guid)
# TODO Per download progress
pipe.feedback('download')
ensure(hints.get('unpack_size') or 0, hints.get('bundle_size') or 0)
blob = client.IPCConnection().download(['implementation', guid, 'data'])
_unpack_stream(blob, path)
with toolkit.new_file(join(path, '.unpack_size')) as f:
json.dump(hints.get('unpack_size') or 0, f)
topdir = os.listdir(path)[-1:]
if topdir:
for exec_dir in ('bin', 'activity'):
bin_path = join(path, topdir[0], exec_dir)
if not exists(bin_path):
continue
for filename in os.listdir(bin_path):
os.chmod(join(bin_path, filename), 0755)
return path
def _list():
total = 0
result = []
root = join(client.local_root.value, 'cache', 'implementation')
if not exists(root):
os.makedirs(root)
return 0, []
for filename in os.listdir(root):
path = join(root, filename)
if not isdir(path):
continue
try:
with file(join(path, '.unpack_size')) as f:
unpack_size = json.load(f)
total += unpack_size
# Negative `unpack_size` to process large impls at first
result.append((os.stat(path).st_mtime, -unpack_size, path))
except Exception:
toolkit.exception('Cannot list %r cached implementation', path)
result.append((0, 0, path))
return total, sorted(result)
def _unpack_stream(stream, dst):
with toolkit.NamedTemporaryFile() as tmp_file:
for chunk in stream:
tmp_file.write(chunk)
tmp_file.flush()
if not exists(dst):
os.makedirs(dst)
try:
with Bundle(tmp_file.name, 'application/zip') as bundle:
bundle.extractall(dst)
except Exception:
shutil.rmtree(dst, ignore_errors=True)
raise
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