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# Copyright (C) 2012 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 sys
import time
import json
import shutil
import hashlib
import cPickle as pickle
from base64 import b64decode
from os.path import exists, join, isdir, basename, relpath, lexists, isabs
from active_document import env
from active_document.metadata import PropertyMeta, BlobProperty
from active_toolkit.sockets import BUFFER_SIZE
from active_toolkit import util
class Storage(object):
"""Get access to documents' data storage."""
def __init__(self, root, metadata):
self._root = root
self.metadata = metadata
def get(self, guid):
"""Get access to particular document's properties.
:param guid:
document GUID to get access to
:returns:
`Record` object
"""
return Record(self._path(guid))
def delete(self, guid):
"""Remove document properties from the storage.
:param guid:
document to remove
"""
path = self._path(guid)
if not exists(path):
return
try:
shutil.rmtree(path)
except Exception, error:
util.exception()
raise RuntimeError('Cannot delete %r document from %r: %s' %
(guid, self.metadata.name, error))
def walk(self, mtime):
"""Generator function to enumerate all existing documents.
:param mtime:
return entities that were modified after `mtime`
:returns:
generator returns (guid, properties) typle for all found
documents; the properties dictionary will contain only
`StoredProperty` properties
"""
if not exists(self._root):
return
for guids_dirname in os.listdir(self._root):
guids_dir = join(self._root, guids_dirname)
if not isdir(guids_dir) or \
mtime and os.stat(guids_dir).st_mtime < mtime:
continue
for guid in os.listdir(guids_dir):
path = join(guids_dir, guid, 'guid')
if exists(path) and os.stat(path).st_mtime > mtime:
yield guid
def migrate(self, guid):
root = self._path(guid)
record = self.get(guid)
path = join(root, '.seqno')
if exists(path):
seqno = int(os.stat(path).st_mtime)
with file(join(root, 'seqno'), 'w') as f:
pickle.dump({'seqno': seqno, 'value': seqno}, f)
os.unlink(path)
for name, prop in self.metadata.items():
path = join(root, name)
if exists(path + '.seqno'):
self._migrate_to_1(path, prop)
continue
if exists(path):
with file(path) as f:
meta = f.read()
if meta:
if meta[0] == '{':
with file(path, 'w') as f:
pickle.dump(json.loads(meta), f)
continue
if not isinstance(prop, BlobProperty) and prop.default is not None:
record.set(name, seqno=0, value=prop.default)
def _migrate_to_1(self, path, prop):
meta = {'seqno': int(os.stat(path + '.seqno').st_mtime)}
mtime = None
if lexists(path):
if exists(path):
mtime = os.stat(path).st_mtime
else:
os.unlink(path)
if isinstance(prop, BlobProperty):
if mtime is not None:
if exists(path + '.sha1'):
with file(path + '.sha1') as f:
meta['digest'] = f.read().strip()
os.unlink(path + '.sha1')
else:
# TODO calculate new digest
meta['digest'] = ''
shutil.move(path, path + PropertyMeta.BLOB_SUFFIX)
meta['mime_type'] = prop.mime_type
else:
if exists(path + '.sha1'):
os.unlink(path + '.sha1')
meta = None
else:
if mtime is not None:
with file(path) as f:
value = json.load(f)
if prop.localized and type(value) is not dict:
value = {env.DEFAULT_LANG: value}
else:
value = prop.default
meta['value'] = value
if meta is not None:
with file(path, 'w') as f:
pickle.dump(meta, f)
if mtime is not None:
os.utime(path, (mtime, mtime))
os.unlink(path + '.seqno')
def _path(self, guid, *args):
return join(self._root, guid[:2], guid, *args)
class Record(object):
"""Interface to document data."""
def __init__(self, root):
self._root = root
@property
def guid(self):
return basename(self._root)
@property
def exists(self):
return exists(self._root)
@property
def consistent(self):
return exists(join(self._root, 'guid'))
def invalidate(self):
guid_path = join(self._root, 'guid')
if exists(guid_path):
os.unlink(guid_path)
def get(self, prop):
path = join(self._root, prop)
if exists(path):
return PropertyMeta(path)
def set(self, prop, mtime=None, path=None, content=None, **meta):
if not exists(self._root):
os.makedirs(self._root)
meta_path = join(self._root, prop)
blob_path = join(self._root, prop + PropertyMeta.BLOB_SUFFIX)
if content is not None:
with util.new_file(blob_path) as f:
f.write(b64decode(content))
elif path and exists(path):
util.cptree(path, blob_path)
with util.new_file(meta_path) as f:
pickle.dump(meta, f)
if mtime:
os.utime(meta_path, (mtime, mtime))
if prop == 'guid':
if not mtime:
mtime = time.time()
# Touch directory to let it possible to crawl it on startup
# when index was not previously closed properly
os.utime(join(self._root, '..'), (mtime, mtime))
def set_blob(self, prop, data=None, size=None, **kwargs):
if not exists(self._root):
os.makedirs(self._root)
path = join(self._root, prop + PropertyMeta.BLOB_SUFFIX)
meta = PropertyMeta(**kwargs)
if data is None:
if exists(path):
os.unlink(path)
elif isinstance(data, PropertyMeta):
data.update(meta)
meta = data
else:
digest = hashlib.sha1()
if hasattr(data, 'read'):
if size is None:
size = sys.maxint
self._set_blob_by_stream(digest, data, size, path)
elif isabs(data) and exists(data):
self._set_blob_by_path(digest, data, path)
else:
with util.new_file(path) as f:
f.write(data)
digest.update(data)
meta['digest'] = digest.hexdigest()
self.set(prop, **meta)
def _set_blob_by_stream(self, digest, stream, size, path):
with util.new_file(path) as f:
while size > 0:
chunk = stream.read(min(size, BUFFER_SIZE))
if not chunk:
break
f.write(chunk)
size -= len(chunk)
if digest is not None:
digest.update(chunk)
def _set_blob_by_path(self, digest, src_path, dst_path):
util.cptree(src_path, dst_path)
def hash_file(path):
with file(path) as f:
while True:
chunk = f.read(BUFFER_SIZE)
if not chunk:
break
if digest is not None:
digest.update(chunk)
if isdir(dst_path):
for root, __, files in os.walk(dst_path):
for filename in files:
path = join(root, filename)
if digest is not None:
digest.update(relpath(path, dst_path))
hash_file(path)
else:
hash_file(dst_path)
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