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Add basic sync function

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This commit is contained in:
Markus Unterwaditzer 2014-02-15 12:49:04 +01:00
parent e03a677df4
commit 5f1b0d190f
1 changed files with 36 additions and 0 deletions
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vdirsyncer/sync.py Normal file
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def sync(storage_a, storage_b, status):
'''Syncronizes two storages.
:param storage_a: The first storage
:param storage_b: The second storage
:param status: {uid: (etag_a, etag_b)}
'''
items_a = dict(storage_a.list_items())
items_b = dict(storage_b.list_items())
downloads_a = set() # uids which to copy from a to b
downloads_b = set() # uids which to copy from b to a
deletes_a = set()
deletes_b = set()
for uid in set(items_a) + set(items_b):
if uid not in status:
if uid in items_a and uid in items_b: # missing status
status[uid] = (items_a[uid], items_b[uid]) # TODO: might need etag diffing too?
elif uid in items_a and uid not in items_b: # new item in a
downloads_a.add(uid)
elif uid not in items_a and uid in items_b: # new item in b
downloads_b.add(uid)
else:
if uid in items_a and uid in items_b:
if items_a[uid] != status[uid][0] and items_a[uid] != status[uid][1]:
1/0 # conflict resolution
elif items_a[uid] != status[uid][0]: # item update in a
downloads_a.add(uid)
elif items_b[uid] != status[uid][1]: # item update in b
downloads_b.add(uid)
else: # completely in sync!
pass
elif uid in items_a and uid not in items_b: # deleted from b
deletes_a.add(uid)
elif uid not in items_a and uid in items_b: # deleted from a
deletes_b.add(uid)