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Some code cleanup for sync

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This commit is contained in:
Markus Unterwaditzer 2014-04-07 19:41:11 +02:00
parent bc954cf3a5
commit f758e6d6d8
1 changed files with 33 additions and 28 deletions
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61
vdirsyncer/sync.py
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@ -15,6 +15,8 @@
:copyright: (c) 2014 Markus Unterwaditzer
:license: MIT, see LICENSE for more details.
'''
import itertools
import vdirsyncer.exceptions as exceptions
import vdirsyncer.log
sync_logger = vdirsyncer.log.get('sync')
@ -74,18 +76,17 @@ def sync(storage_a, storage_b, status, conflict_resolution=None):
b_uid_to_href = dict((x['uid'], href) for href, x in list_b.iteritems())
del a_href_to_uid, b_href_to_uid
storages = {
'a': (storage_a, list_a, a_uid_to_href),
'b': (storage_b, list_b, b_uid_to_href)
}
actions, prefetch_from_a, prefetch_from_b = \
get_actions(list_a, list_b, status, a_uid_to_href, b_uid_to_href)
get_actions(storages, status)
prefetch(storage_a, list_a, prefetch_from_a)
prefetch(storage_b, list_b, prefetch_from_b)
storages = {
'a': (storage_a, list_a, a_uid_to_href),
'b': (storage_b, list_b, b_uid_to_href),
None: (None, None, None)
}
for action in actions:
action(storages, status, conflict_resolution)
@ -133,7 +134,7 @@ def action_update(uid, source, dest):
return inner
def action_delete(uid, source, dest):
def action_delete(uid, dest):
def inner(storages, status, conflict_resolution):
if dest is not None:
dest_storage, dest_list, dest_uid_to_href = storages[dest]
@ -178,32 +179,38 @@ def action_conflict_resolve(uid):
return inner
def get_actions(list_a, list_b, status, a_uid_to_href, b_uid_to_href):
def get_actions(storages, status):
prefetch_from_a = []
prefetch_from_b = []
actions = []
uids_a = set(x['uid'] for x in list_a.values())
uids_b = set(x['uid'] for x in list_b.values())
uids_status = set(status)
for uid in uids_a.union(uids_b).union(uids_status):
storage_a, list_a, a_uid_to_href = storages['a']
storage_b, list_b, b_uid_to_href = storages['b']
uids_a = (x['uid'] for x in list_a.itervalues())
uids_b = (x['uid'] for x in list_b.itervalues())
handled = set()
for uid in itertools.chain(uids_a, uids_b, status):
if uid in handled:
continue
handled.add(uid)
href_a = a_uid_to_href.get(uid, None)
href_b = b_uid_to_href.get(uid, None)
a = list_a.get(href_a, None)
b = list_b.get(href_b, None)
if uid not in status:
if uid in uids_a and uid in uids_b: # missing status
if a and b: # missing status
actions.append(action_conflict_resolve(uid))
# new item was created in a
elif uid in uids_a and uid not in uids_b:
elif a and not b: # new item was created in a
prefetch_from_a.append(href_a)
actions.append(action_upload(uid, 'a', 'b'))
# new item was created in b
elif uid not in uids_a and uid in uids_b:
elif not a and b: # new item was created in b
prefetch_from_b.append(href_b)
actions.append(action_upload(uid, 'b', 'a'))
else:
_, status_etag_a, _, status_etag_b = status[uid]
if uid in uids_a and uid in uids_b:
if a and b:
if a['etag'] != status_etag_a and b['etag'] != status_etag_b:
prefetch_from_a.append(href_a)
prefetch_from_b.append(href_b)
@ -214,13 +221,11 @@ def get_actions(list_a, list_b, status, a_uid_to_href, b_uid_to_href):
elif b['etag'] != status_etag_b: # item was updated in b
prefetch_from_b.append(href_b)
actions.append(action_update(uid, 'b', 'a'))
else: # completely in sync!
pass
elif uid in uids_a and uid not in uids_b: # was deleted from b
actions.append(action_delete(uid, None, 'a'))
elif uid not in uids_a and uid in uids_b: # was deleted from a
actions.append(action_delete(uid, None, 'b'))
# was deleted from a and b
elif uid not in uids_a and uid not in uids_b:
actions.append(action_delete(uid, None, None))
elif a and not b: # was deleted from b
actions.append(action_delete(uid, 'a'))
elif not a and b: # was deleted from a
actions.append(action_delete(uid, 'b'))
elif not a and not b: # was deleted from a and b
actions.append(action_delete(uid, None))
return actions, prefetch_from_a, prefetch_from_b