/usr/lib/python3/dist-packages/dep11/datacache.py is in python3-dep11 0.4.0-1build1.
This file is owned by root:root, with mode 0o644.
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#
# Copyright (C) 2014-2015 Matthias Klumpp <mak@debian.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3.0 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program.
import os
import glob
import shutil
import logging as log
import lmdb
from math import pow
def tobytes(s):
if isinstance(s, bytes):
return s
return bytes(s, 'utf-8')
class DataCache:
""" A LMDB based cache for the DEP-11 generator """
def __init__(self, media_dir):
self._pkgdb = None
self._hintsdb = None
self._datadb = None
self._dbenv = None
self.cache_dir = None
self._opened = False
self.media_dir = media_dir
# set a huge map size to be futureproof.
# This means we're cruel to non-64bit users, but this
# software is supposed to be run on 64bit machines anyway.
self._map_size = pow(1024, 4)
def open(self, cachedir):
self._dbenv = lmdb.open(cachedir, max_dbs=3, map_size=self._map_size)
self._pkgdb = self._dbenv.open_db(b'packages')
self._hintsdb = self._dbenv.open_db(b'hints')
self._datadb = self._dbenv.open_db(b'metadata')
self._opened = True
self.cache_dir = cachedir
return True
def close(self):
if not self._opened:
return
self._dbenv.close()
self._pkgdb = None
self._hintsdb = None
self._datadb = None
self._dbenv = None
self._opened = False
def reopen(self):
self.close()
self.open(self.cache_dir)
def metadata_exists(self, global_id):
gid = tobytes(global_id)
with self._dbenv.begin(db=self._datadb) as txn:
return txn.get(gid) != None
def get_metadata(self, global_id):
gid = tobytes(global_id)
with self._dbenv.begin(db=self._datadb) as dtxn:
d = dtxn.get(tobytes(gid))
if not d:
return None
return str(d, 'utf-8')
def set_metadata(self, global_id, yaml_data):
gid = tobytes(global_id)
with self._dbenv.begin(db=self._datadb, write=True) as txn:
txn.put(gid, tobytes(yaml_data))
def set_package_ignore(self, pkgid):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._pkgdb, write=True) as txn:
txn.put(pkgid, b'ignore')
def get_cpt_gids_for_pkg(self, pkgid):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._pkgdb) as txn:
cs_str = txn.get(pkgid)
if not cs_str:
return None
cs_str = str(cs_str, 'utf-8')
if cs_str == 'ignore' or cs_str == 'seen':
return None
gids = cs_str.split("\n")
return gids
def get_metadata_for_pkg(self, pkgid):
gids = self.get_cpt_gids_for_pkg(pkgid)
if not gids:
return None
data = ""
for gid in gids:
d = self.get_metadata(gid)
if d:
data += d
return data
def set_components(self, pkgid, cpts):
# if the package has no components,
# mark it as always-ignore
if len(cpts) == 0:
self.set_package_ignore(pkgid)
return
pkgid = tobytes(pkgid)
gids = list()
hints_str = ""
for cpt in cpts:
# check for ignore-reasons first, to avoid a database query
if not cpt.has_ignore_reason():
if self.metadata_exists(cpt.global_id):
gids.append(cpt.global_id)
else:
# get the metadata in YAML format
md_yaml = cpt.to_yaml_doc()
# we need to check for ignore reasons again, since generating
# the YAML doc may have raised more errors
if not cpt.has_ignore_reason():
self.set_metadata(cpt.global_id, md_yaml)
gids.append(cpt.global_id)
hints_yml = cpt.get_hints_yaml()
if hints_yml:
hints_str += hints_yml
self.set_hints(pkgid, hints_str)
if gids:
with self._dbenv.begin(db=self._pkgdb, write=True) as txn:
txn.put(pkgid, bytes("\n".join(gids), 'utf-8'))
elif hints_str:
# we need to set some value for this package, to show that we've seen it
with self._dbenv.begin(db=self._pkgdb, write=True) as txn:
txn.put(pkgid, b'seen')
def get_hints(self, pkgid):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._hintsdb) as txn:
hints = txn.get(pkgid)
if hints:
hints = str(hints, 'utf-8')
return hints
def set_hints(self, pkgid, hints_yml):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._hintsdb, write=True) as txn:
txn.put(pkgid, tobytes(hints_yml))
def _cleanup_empty_dirs(self, d):
parent = os.path.abspath(os.path.join(d, os.pardir))
if not os.path.isdir(parent):
return
if not os.listdir(parent):
os.rmdir(parent)
parent = os.path.abspath(os.path.join(parent, os.pardir))
if not os.path.isdir(parent):
return
if not os.listdir(parent):
os.rmdir(parent)
def remove_package(self, pkgid):
log.debug("Dropping package: %s" % (pkgid))
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._pkgdb, write=True) as pktxn:
pktxn.delete(pkgid)
with self._dbenv.begin(db=self._hintsdb, write=True) as htxn:
htxn.delete(pkgid)
def is_ignored(self, pkgid):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._pkgdb) as txn:
return txn.get(pkgid) == b'ignore'
def package_exists(self, pkgid):
pkgid = tobytes(pkgid)
with self._dbenv.begin(db=self._pkgdb) as txn:
return txn.get(pkgid) != None
def get_packages_not_in_set(self, pkgset):
res = set()
if not pkgset:
pkgset = set()
with self._dbenv.begin(db=self._pkgdb) as txn:
cursor = txn.cursor()
for key, value in cursor:
if not str(key, 'utf-8') in pkgset:
res.add(key)
return res
def remove_orphaned_components(self):
gid_pkg = dict()
with self._dbenv.begin(db=self._pkgdb) as txn:
cursor = txn.cursor()
for key, value in cursor:
if not value or value == b'ignore' or value == b'seen':
continue
value = str(value, 'utf-8')
gids = value.split("\n")
for gid in gids:
if not gid_pkg.get(gid):
gid_pkg[gid] = list()
gid_pkg[gid].append(key)
# remove the media and component data, if component is orphaned
with self._dbenv.begin(db=self._datadb) as dtxn:
cursor = dtxn.cursor()
for gid, yaml in cursor:
gid = str(gid, 'utf-8')
# Check if we have a package which is still referencing this component
pkgs = gid_pkg.get(gid)
if pkgs:
continue
# drop cached media
dirs = glob.glob(os.path.join(self.media_dir, "*", gid))
if dirs:
shutil.rmtree(dirs[0])
log.info("Expired media: %s" % (gid))
# remove possibly empty directories
self._cleanup_empty_dirs(dirs[0])
# drop component from db
with self._dbenv.begin(db=self._datadb, write=True) as dtxn:
dtxn.delete(tobytes(gid))
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