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operations.py
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operations.py
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import client
import database
from quickxorhash import quickxorhash
import base64
import logging
import pathlib
logger = logging.getLogger(__name__)
def quickxor_file(filename):
h = quickxorhash()
with open(filename, 'rb') as f:
buf_size = 4096
while True:
buf = f.read(buf_size)
if buf:
h.update(buf)
else:
break
return base64.b64encode(h.digest()).decode()
class Node:
def __init__(self, path, item, db, client, parent_node=None):
self.db = db
self.client = client
self.queries = 0
self.parent_node = parent_node
if path is not None and not isinstance(path, pathlib.Path):
path = pathlib.Path(path)
self.path = path
self.item = item
if self.item is not None and parent_node is not None:
self.onedrive_path = '{}/{}'.format(
parent_node.onedrive_path, self.item.name)
elif self.item is not None:
self.onedrive_path = self.item.name
else:
self.onedrive_path = ''
def act(self, check_hash=False):
if self.path is not None and self.item is not None:
logger.debug('Act: update %s, %s', self.path,
self.item.onedrive_id)
if not self.check_folder():
return
if self.item.original_path != str(self.path):
# Usually this happens only the first time, so an
# additional query here is not that bad
self.item.original_path = str(self.path)
self.db.update_items([self.item])
self.queries += 1
# Directories are always up to date
if self.path.is_file():
self.update(check_hash)
elif self.path is not None:
logger.debug('Act: create %s', self.path)
self.create()
elif self.item is not None:
logger.debug('Act: delete %s %s',
self.item.onedrive_id, self.item.name)
self.delete()
else:
logger.error('Node with both path and item none')
def check_folder(self):
if (self.item is None or self.path is None
or self.item.is_folder == self.path.is_dir()):
return True
logging.warning('Inconsistency in path and item is_folder. '
'Deleting old item and creating a new one.')
self.delete()
self.create()
return False
def update(self, check_hash=False):
if self.path is None or self.item is None:
logger.error('Called update with None path or item')
return False
if self.path.is_dir():
logger.debug('Ignoring update on directory %s', self.path)
return True
mtime_window = 2
stat = self.path.stat()
updated = (stat.st_size == self.item.size
and (abs(stat.st_mtime - self.item.mdate.timestamp())
< mtime_window))
if check_hash and updated:
hash_ = quickxor_file(str(self.path))
if hash_ != self.item.hash:
updated = False
logger.info('%s passed size and mtime check but not hash',
self.path)
if updated:
logger.debug('Item %s already up to date', self.path)
return True
if stat.st_size == 0:
# XXX Maybe still possible to do something
logger.warning('Skipping update of an empty file')
return True
logger.debug('Uploading new version of %s', self.path)
parent_id = (self.parent_node.item.onedrive_id
if self.parent_node is not None else None)
new_item = self.client.upload(
str(self.path), self.item.onedrive_id, parent_id)
if new_item is None:
logger.error('Could not update %s', self.path)
return False
self.item = new_item
self.db.update_items([new_item])
self.queries += 1
return True
def create(self):
parent_id = (self.parent_node.item.onedrive_id
if self.parent_node is not None else None)
if self.item is not None:
logger.error('Tried to call create on a node that already has an '
'item (%s, %s)', self.path, self.item.onedrive_id)
return False
if self.path.is_dir():
item = self.client.create_folder(parent_id, self.path.name)
elif self.path.is_file():
target = self.parent_node.onedrive_path + '/' + self.path.name
item = self.client.upload(
str(self.path), target, self.parent_node.item.onedrive_id,
False)
else:
logger.error('Tried to call create on something that is neither a '
'file nor a directory (%s)', self.path)
return False
if item is None:
logger.error('Creation of %s failed', self.path)
return False
self.db.add_item(item)
self.queries += 1
self.item = item
if self.parent_node is not None:
self.onedrive_path = self.parent_node.onedrive_path + '/'
else:
self.onedrive_path = ''
self.onedrive_path += item.name
return True
def delete(self):
okay = False
if self.client.delete_item(self.item.onedrive_id):
self.db.delete_items([self.item])
self.queries += 1
okay = True
if not okay:
logger.error('Could not delete %s (%s).', self.item.onedrive_id,
self.item.name)
self.item = None
return okay
def get_children(self):
if self.path is None or not self.path.is_dir():
return []
# Avoid saving children, because they contain the reference to
# us, and this prevents garbage collection.
return ChildrenLister(self).get_children()
class ChildrenLister:
def __init__(self, node):
if node.path is None or not node.path.is_dir():
raise ValueError('Need a directory to list children')
self.node = node
self.path = node.path
self.item = node.item
self.db = node.db
self.client = node.client
self.children = {}
self.orphaned_items = {}
self.new_children = {}
self.conflicts = {}
def add_child(self, path, item):
self.children[path.name] = Node(
path, item, self.db, self.client, self.node)
def list_items(self):
if self.item is not None:
items = self.db.get_children(self.item.onedrive_id)
else:
return
for item in items:
if item.original_path is not None:
path = pathlib.Path(item.original_path)
if path.exists():
self.add_child(path, item)
else:
item.original_path = None
# Not elif: might change in the previous if
if item.original_path is None:
self.orphaned_items[item.name.lower()] = item
def list_fs(self):
for i in self.path.iterdir():
if i.name in self.children:
continue
key = i.name.lower()
if i not in self.new_children:
self.new_children[key] = []
self.new_children[key].append(i)
def resolve_simple(self):
to_add = []
for lower, files in self.new_children.items():
if len(files) == 1 and lower in self.orphaned_items:
self.add_child(files[0], self.orphaned_items.pop(lower))
elif lower not in self.orphaned_items:
# This is a conclict, but OneDrive will handle it
to_add += files
else:
self.conflicts[lower] = files
self.new_children = to_add
def resolve_conflicts(self):
for lower, files in self.conflicts.items():
item = self.orphan_items[lower]
associate_to = -1
for i in range(len(files)):
hash_ = quickxor_file(files[i])
if hash_ == item.hash:
associate_to = i
break
if associate_to != -1:
self.add_child(files.pop(associate_to), item)
del self.orphaned_items[lower]
# Leave the rest to OneDrive
self.new_children += files
def get_children(self):
logger.debug('Started children lister for %s', self.path)
# List from DB and associate whatever possible
self.list_items()
# List from filesystem, to look for new files/directories
self.list_fs()
# Resolve what does not create conclifcts (for us)
self.resolve_simple()
# Try to resolve any conflict
self.resolve_conflicts()
oprhaned_nodes = [Node(None, item, self.db, self.client, self.node)
for item in self.orphaned_items.values()]
new_nodes = [Node(path, None, self.db, self.client, self.node)
for path in self.new_children]
return list(self.children.values()) + oprhaned_nodes + new_nodes
class Operations:
def __init__(self):
self.db = database.Database()
self.client = client.Client()
# Get the drives, only to test the connection, raise any error,
# if needed, or refresh the token with an easy request
# a GET, without e.g. POST data
self.client.get_drives()
def populate_db(self):
logger.info('Starting populating the database')
commit_every_n = 1000
to_get = []
self.db.mark_not_existing()
for one_path, local_path in self.client.config['synchronize'].items():
item = self.client.get_item_by_path(one_path)
item.original_path = local_path
self.db.add_update_item(item)
if item.is_folder:
# Should always be the case for this kind of query
to_get.append(item.onedrive_id)
self.db.commit()
counter = 0
while to_get:
parent_id = to_get[0]
logger.debug('Populating children of %s', parent_id)
try:
children = self.client.get_children(parent_id)
except client.ThrottleError as e:
logger.debug('Throttle request: sleeping for %i',
e.retry_after)
e.sleep()
continue
to_get.pop(0)
for item in children:
item.parent_id = parent_id
self.db.add_update_item(item)
if item.is_folder:
to_get.append(item.onedrive_id)
counter += 1
if counter % commit_every_n == 0:
self.db.commit()
self.db.delete_not_existing()
self.db.commit()
self.db.vacuum()
def compare_trees(self, check_hash=False):
save_every_n = 1000
to_work = []
for name, dir_ in self.client.config['synchronize'].items():
to_work.append(Node(
pathlib.Path(dir_),
self.db.get_from_root(name),
self.db,
self.client))
unsaved = 0
while to_work:
node = to_work.pop()
node.act(check_hash)
to_work = node.get_children() + to_work
unsaved += node.queries
if unsaved > save_every_n:
self.db.commit()
logger.debug('Committing (%d unsaved)', unsaved)
unsaved = 0