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purge dest files removed on src

This commit is contained in:
Dave Pedu 2016-06-09 14:48:37 -07:00
parent 4b4d14c832
commit a2922b90a9
1 changed files with 57 additions and 26 deletions
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83
b2mirror/mirror.py
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@ -7,19 +7,20 @@ from b2.api import B2Api
import sys
from itertools import islice, filterfalse
from concurrent.futures import ThreadPoolExecutor, Future
import logging
import re
#import logging
#logging.basicConfig(level=logging.INFO)
FileInfo = namedtuple('FileInfo', ['abs_path', 'rel_path', 'size', 'mtime', ]) # 'fp'
"""
How it works:
B2SyncManager manages the transfer
It holes a src and dest object, src objects provide an iterable of FileInfos.
It holds a src and dest object, src objects provide an iterable of FileInfos.
The manager will iterate the set of FileInfos, and pass each to the dest
@ -30,7 +31,7 @@ class B2SyncManager(object):
workers = 10
def __init__(self, source_module, dest_module):
def __init__(self, source_module, dest_module, exclude_res=None):
self.src = source_module
self.dest = dest_module
self.db = sqlite3.connect('./sync.db', check_same_thread=False)
@ -38,7 +39,7 @@ class B2SyncManager(object):
self.db.isolation_level = None # TBD - does it hurt perf?
self.exclude_res = [
re.compile(r'.*\.(DS_Store|pyc|dropbox)$')
]
] + (exclude_res if exclude_res else [])
self._init_db()
@staticmethod
@ -83,6 +84,13 @@ class B2SyncManager(object):
def sync_up(self):
print("Syncing from {} to {}".format(self.src, self.dest))
# Mark all files as unseen
# Files will be marked as seen as they are processed
# Later, unseen files will be purged
c = self.db.cursor()
row = c.execute("UPDATE 'files' SET seen=0;")
c.close()
chunk_size = 1000
files_source = filterfalse( # if rel_path matches any of the REs, the filter is True and the file is skipped
@ -102,25 +110,19 @@ class B2SyncManager(object):
with ThreadPoolExecutor(max_workers=B2SyncManager.workers) as executor:
upload_futures = [executor.submit(self.xfer_file, item) for item in chunk]
#print("Queued {} tasks".format(len(chunk)))
for i in upload_futures:
assert i.result()
def canskip(self, f):
if f.rel_path.endswith('.DS_Store'):
return True
else:
return False
def xfer_file(self, f):
c = self.db.cursor()
row = c.execute("SELECT * FROM 'files' WHERE `path` = ?;", (f.rel_path,)).fetchone()
if self.canskip(f) or not row or row['mtime'] < f.mtime:
print("Starting:", f.rel_path)
if not row or row['mtime'] < f.mtime:
print("Uploading:", f.rel_path)
try:
self.dest.put_file(f)
except:
@ -128,18 +130,31 @@ class B2SyncManager(object):
print("Unexpected error:", sys.exc_info()[0])
raise
#print("Ok: ", f.rel_path)
#f.fp.close()
# The file was uploaded, commit it to the db
c.execute("REPLACE INTO 'files' VALUES(?, ?, ?, ?);", (f.rel_path, f.mtime, f.size, 1))
#print("Done: ", f.rel_path)
else:
print("Skipping:", f.rel_path)
c.execute("UPDATE 'files' SET seen=1 WHERE `path` = ?;", (f.rel_path,)).fetchone()
#print("Skipping:", f.rel_path)
c.close()
return True
def purge_remote(self):
c = self.db.cursor()
c_del = self.db.cursor()
for purge_file in c.execute("SELECT * FROM 'files' WHERE seen=0;"):
print("Delete on remote: ", purge_file["path"])
self.dest.purge_file(purge_file["path"])
c_del.execute("DELETE FROM 'files' WHERE path=?;", (purge_file["path"],))
c_del.close()
c.close()
class Provider(object):
"""
@ -148,7 +163,12 @@ class Provider(object):
def __init__(self):
pass
FileInfo = namedtuple('FileInfo', ['abs_path', 'rel_path', 'size', 'mtime', ]) # 'fp'
def __iter__(self):
return self
def __next__(self):
raise NotImplemented()
class LocalProvider(Provider):
"""
@ -161,9 +181,6 @@ class LocalProvider(Provider):
self.current_set = (None, [], [])
self.walker = os.walk(self.local_path)
def __iter__(self):
return self
def __next__(self):
if len(self.current_set[2]) > 0:
file_abs_path = os.path.join(self.current_set[0], self.current_set[2].pop())
@ -196,6 +213,11 @@ class Reciever(object):
"""
Base class for destinations
"""
def put_file(self, file_info):
raise NotImplemented()
def purge_file(self, file_path):
raise NotImplemented()
class B2Reciever(Reciever):
@ -203,14 +225,14 @@ class B2Reciever(Reciever):
def __init__(self, bucket, path, account_id, app_key):
super(B2Reciever, self).__init__()
self.bucket = bucket
self.bucket_name = bucket
self.path = path
self.account_id = account_id
self.app_key = app_key
self.api = B2Api(max_upload_workers=B2SyncManager.workers)
self.api.authorize_account('production', self.account_id, self.app_key)
self.bucket = self.api.get_bucket_by_name(self.bucket)
self.bucket = self.api.get_bucket_by_name(self.bucket_name)
def put_file(self, file_info):
#print(">>> {}".format(file_info.abs_path))
@ -220,12 +242,23 @@ class B2Reciever(Reciever):
dest_path
)
def purge_file(self, file_path):
dest_path = os.path.join(self.path, file_path).lstrip('/')
self.delete_by_path(dest_path)
def delete_by_path(self, file_path):
for f in self.bucket.list_file_versions(start_filename=file_path, max_entries=100)["files"]:
if f["fileName"] == file_path:
self.api.delete_file_version(f["fileId"], f["fileName"])
else:
return
def sync(source_uri, dest_uri, account_id, app_key):
source = urlparse(source_uri)
dest = urlparse(dest_uri)
syncer = B2SyncManager(source_uri, dest_uri)
source_provider = None
dest_receiver = None
@ -239,8 +272,6 @@ def sync(source_uri, dest_uri, account_id, app_key):
else:
raise Exception("Dests other than B2 URIs not yet supported")
assert source_provider is not None
assert dest_receiver is not None