133 lines
4.6 KiB
Python
133 lines
4.6 KiB
Python
import re
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from urllib.parse import urlparse
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from itertools import islice, filterfalse
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from concurrent.futures import ThreadPoolExecutor
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from b2mirror.localplugin import LocalProvider
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from b2mirror.b2plugin import B2Reciever
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from b2mirror.common import results_ok
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import logging
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"""
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How it works:
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B2SyncManager manages the transfer
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It holds a src and dest object, src objects provide an iterable of FileInfos.
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The manager will iterate the set of FileInfos, and pass each to the dest
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Dest will upload the file, and inform the manager it was completed
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"""
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class B2SyncManager(object):
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def __init__(self, source_module, dest_module, exclude_res=None, workers=10):
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"""
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:param source_module: subclass instance of b2mirror.base.Provider acting as a file source
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:param dest_module: subclass of b2mirror.base.Receiver acting as a file destination
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:param exclude_res: compiled regular expression objects that file paths will be matched against. Finding a match
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means skip the file (and delete on the remote).
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:param workers: Number of parallel transfers
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"""
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self.log = logging.getLogger("B2SyncManager")
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self.src = source_module
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self.dest = dest_module
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self.exclude_res = [
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re.compile(r'.*\.(DS_Store|pyc|dropbox)$'),
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re.compile(r'.*__pycache__.*'),
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re.compile(r'.*\.dropbox\.cache.*'),
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re.compile(r'.*\.AppleDouble.*')
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] + (exclude_res if exclude_res else [])
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self.workers = workers
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self.log.info("Initialized with %s workers, %s ignores", self.workers, len(self.exclude_res))
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def sync(self):
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"""
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Sync the source to the dest. First uploads new local files, then cleans dead files from the remote.
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"""
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# Phase 1 - Upload all local files missing on the remote
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self.sync_up()
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# Phase 2 - Delete files on the remote missing locally
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self.purge_remote()
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# Phase 3 - Tear down the src/dest modules
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self.cleanup()
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def sync_up(self):
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"""
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Sync local files to the remote. All files in the DB will be marked as unseen. When a file is found locally it is
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again marked as seen. This state later used to clear deleted files from the destination
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"""
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self.log.info("beginning upload phase")
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chunk_size = 1000
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# if rel_path matches any of the REs, the filter is True and the file is skipped
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files_source = filterfalse(lambda x: any([pattern.match(x.rel_path) for pattern in self.exclude_res]), self.src)
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while True:
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chunk = list(islice(files_source, chunk_size))
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for item in chunk:
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# long path names can't be put in sqlite
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assert len(item.rel_path) < 1024
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if len(chunk) == 0:
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break
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with ThreadPoolExecutor(max_workers=self.workers) as executor:
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upload_futures = [executor.submit(self.dest.xfer_file, item) for item in chunk]
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for i in upload_futures:
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assert i.result() in results_ok
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def purge_remote(self):
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"""
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During upload phase it is expected that destination modules track state of what files have been seen on the
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local end. When local scan + upload is complete, the module uses this state to purge dead files on the remote.
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"""
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self.log.info("beginning remote purge phase")
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self.dest.purge()
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def cleanup(self):
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self.log.info("beginning cleanp phase")
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self.src.teardown()
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self.dest.teardown()
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def sync(source_uri, dest_uri, account_id, app_key, workers=10, exclude=[], compare_method="mtime"):
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log = logging.getLogger("mirror")
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source = urlparse(source_uri)
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dest = urlparse(dest_uri)
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source_provider = None
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dest_receiver = None
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if source.scheme == '': # Plain file URI
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source_provider = LocalProvider(source.path)
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else:
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raise Exception("Sources other than local file paths not supported")
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if dest.scheme == 'b2': # Plain file URI
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dest_receiver = B2Reciever(bucket=dest.netloc, path=dest.path, account_id=account_id, app_key=app_key,
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workers=workers, compare_method=compare_method)
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else:
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raise Exception("Dests other than B2 URIs not yet supported")
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assert source_provider is not None
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assert dest_receiver is not None
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log.info("Source: %s", source_provider)
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log.info("Dest: %s", dest_receiver)
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syncer = B2SyncManager(source_provider, dest_receiver,
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workers=workers, exclude_res=exclude)
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syncer.sync()
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