Add comments and split stuff out
This commit is contained in:
parent
4b958968d1
commit
37b9372f0e
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import os
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from b2.api import B2Api
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from b2mirror.base import Provider, Reciever
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from b2mirror.common import Result, results_ok
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class B2Provider(Provider):
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"""
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Iterates files in bucket
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"""
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def __init__(self, accountId, appKey, bucketId, bucketBasePath):
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super(B2Provider, self).__init__()
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raise NotImplemented()
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class B2Reciever(Reciever):
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max_chunk_size = 256*1024
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def __init__(self, bucket, path, account_id, app_key, workers=10):
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super(B2Reciever, self).__init__()
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self.bucket_name = bucket
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self.path = path
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self.account_id = account_id
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self.app_key = app_key
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self.api = B2Api(max_upload_workers=workers)
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self.api.authorize_account('production', self.account_id, self.app_key)
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self.bucket = self.api.get_bucket_by_name(self.bucket_name)
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def put_file(self, file_info, purge_historics=False):
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dest_path = os.path.join(self.path, file_info.rel_path).lstrip('/')
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upload_result = self.bucket.upload_local_file(
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file_info.abs_path,
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dest_path
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)
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if purge_historics:
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self.delete_by_path(dest_path, skip=1)
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return Result.ok
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def purge_file(self, file_path):
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"""
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Remove a file and all historical copies from the bucket
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:param file_path: File path relative to the source tree to delete. This should NOT include self.path
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"""
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dest_path = os.path.join(self.path, file_path).lstrip('/')
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self.delete_by_path(dest_path)
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def delete_by_path(self, file_path, skip=0, max_entries=100):
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"""
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List all versions of a file and delete some or all of them
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:param file_path: Bucket path to delete
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:param skip: How many files to skip before starting deletion. 5 means keep 5 historical copies. Using a value
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of 0 will delete a file and all it's revisions
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:param max_entries:
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"""
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for f in self.bucket.list_file_versions(start_filename=file_path, max_entries=max_entries)["files"]:
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if f["fileName"] == file_path:
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if skip == 0:
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self.api.delete_file_version(f["fileId"], f["fileName"])
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else:
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skip-=1
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else:
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return
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class Provider(object):
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"""
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Base class file queue iterable
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"""
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def __init__(self):
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pass
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def __iter__(self):
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return self
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def __next__(self):
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raise NotImplemented()
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class Reciever(object):
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"""
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Base class for destinations
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"""
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def put_file(self, file_info, purge_historics=False):
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raise NotImplemented()
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def purge_file(self, file_path):
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raise NotImplemented()
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from enum import Enum
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from collections import namedtuple
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FileInfo = namedtuple('FileInfo', ['abs_path', 'rel_path', 'size', 'mtime', ]) # 'fp'
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class Result(Enum):
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failed = 0
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ok = 1
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skipped = 2
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results_ok = [Result.ok, Result.skipped]
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import os
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from b2mirror.base import Provider, Reciever
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from b2mirror.common import FileInfo
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class LocalProvider(Provider):
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"""
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Iterates files on local disk
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"""
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max_chunk_size = 8*1024*1024
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def __init__(self, local_path):
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super(LocalProvider, self).__init__()
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self.local_path = local_path
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self.current_set = (None, [], [])
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self.walker = os.walk(self.local_path)
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def __next__(self):
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if len(self.current_set[2]) > 0:
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file_abs_path = os.path.join(self.current_set[0], self.current_set[2].pop())
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relative_path = file_abs_path[len(self.local_path):]
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return FileInfo(
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file_abs_path,
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relative_path,
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os.path.getsize(file_abs_path),
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int(os.path.getmtime(file_abs_path)),
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# open(file_abs_path, 'rb')
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)
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else:
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self.current_set = self.walker.__next__()
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self.current_set[1].sort(reverse=True)
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self.current_set[2].sort(reverse=True)
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return self.__next__()
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class LocalReciever(Reciever):
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def __init__(self):
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raise NotImplemented()
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@ -1,18 +1,17 @@
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import os
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import re
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import sys
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import sqlite3
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from urllib.parse import urlparse
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from collections import namedtuple
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from b2.api import B2Api
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import sys
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from itertools import islice, filterfalse
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from concurrent.futures import ThreadPoolExecutor
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import re
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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 Result, results_ok
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# import logging
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# logging.basicConfig(level=logging.INFO)
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FileInfo = namedtuple('FileInfo', ['abs_path', 'rel_path', 'size', 'mtime', ]) # 'fp'
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"""
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How it works:
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class B2SyncManager(object):
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workers = 15
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def __init__(self, source_module, dest_module, exclude_res=None):
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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.src = source_module
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self.dest = dest_module
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self.db = sqlite3.connect('./sync.db', check_same_thread=False)
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self.db.row_factory = B2SyncManager.dict_factory
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self.db.isolation_level = None # TBD - does it hurt perf?
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self.exclude_res = [
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re.compile(r'.*\.(DS_Store|pyc|dropbox)$')
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re.compile(r'.*\.(DS_Store|pyc|dropbox)$'),
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re.compile(r'.+__pycache__.+'),
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re.compile(r'.+.dropbox\.cache.+')
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] + (exclude_res if exclude_res else [])
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self.workers = workers
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self._init_db()
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@staticmethod
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return d
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def _init_db(self):
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"""
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Init the sqlite databsae. Creates missing tables.
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"""
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c = self.db.cursor()
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def table_exists(table_name):
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c.close()
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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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def sync_up(self):
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print("Syncing from {} to {}".format(self.src, self.dest))
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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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#print("Syncing from {} to {}".format(self.src, self.dest))
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# Mark all files as unseen
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# Files will be marked as seen as they are processed
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chunk_size = 1000
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files_source = filterfalse( # if rel_path matches any of the REs, the filter is True and the file is skipped
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lambda x: any([pattern.match(x.rel_path) for pattern in self.exclude_res]),
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self.src)
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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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if len(chunk) == 0:
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break
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with ThreadPoolExecutor(max_workers=B2SyncManager.workers) as executor:
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with ThreadPoolExecutor(max_workers=self.workers) as executor:
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upload_futures = [executor.submit(self.xfer_file, item) for item in chunk]
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for i in upload_futures:
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assert i.result()
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assert i.result() in results_ok
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def xfer_file(self, f):
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"""
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Future-called function that handles a single file. The file's modification time is checked against the database
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to see if the file has new content that should be uploaded or is untouched since the last sync
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"""
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result = Result.failed
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c = self.db.cursor()
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row = c.execute("SELECT * FROM 'files' WHERE `path` = ?;", (f.rel_path,)).fetchone()
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print("Uploading:", f.rel_path)
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try:
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self.dest.put_file(f)
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result = self.dest.put_file(f, purge_historics=row is not None)
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except:
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print("Failed:", f.rel_path)
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print("Unexpected error:", sys.exc_info()[0])
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else:
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c.execute("UPDATE 'files' SET seen=1 WHERE `path` = ?;", (f.rel_path,)).fetchone()
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# print("Skipping:", f.rel_path)
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#print("Skipping:", f.rel_path)
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result = Result.skipped
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c.close()
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return True
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return result
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def purge_remote(self):
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"""
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Delete files on the remote that were not found when scanning the local tree.
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"""
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c = self.db.cursor()
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c_del = self.db.cursor()
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c.close()
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class Provider(object):
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"""
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Base class file queue iterable
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"""
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def __init__(self):
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pass
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def __iter__(self):
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return self
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def __next__(self):
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raise NotImplemented()
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class LocalProvider(Provider):
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"""
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Iterates files on local disk
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"""
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max_chunk_size = 8*1024*1024
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def __init__(self, local_path):
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super(LocalProvider, self).__init__()
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self.local_path = local_path
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self.current_set = (None, [], [])
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self.walker = os.walk(self.local_path)
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def __next__(self):
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if len(self.current_set[2]) > 0:
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file_abs_path = os.path.join(self.current_set[0], self.current_set[2].pop())
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relative_path = file_abs_path[len(self.local_path):]
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return FileInfo(
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file_abs_path,
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relative_path,
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os.path.getsize(file_abs_path),
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int(os.path.getmtime(file_abs_path)),
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# open(file_abs_path, 'rb')
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)
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else:
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self.current_set = self.walker.__next__()
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self.current_set[1].sort(reverse=True)
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self.current_set[2].sort(reverse=True)
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return self.__next__()
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class B2Provider(Provider):
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"""
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Iterates files in bucket
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"""
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def __init__(self, accountId, appKey, bucketId, bucketBasePath):
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super(B2Provider, self).__init__()
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raise NotImplemented()
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class Reciever(object):
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"""
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Base class for destinations
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"""
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def put_file(self, file_info):
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raise NotImplemented()
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def purge_file(self, file_path):
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raise NotImplemented()
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class B2Reciever(Reciever):
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max_chunk_size = 256*1024
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def __init__(self, bucket, path, account_id, app_key):
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super(B2Reciever, self).__init__()
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self.bucket_name = bucket
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self.path = path
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self.account_id = account_id
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self.app_key = app_key
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self.api = B2Api(max_upload_workers=B2SyncManager.workers)
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self.api.authorize_account('production', self.account_id, self.app_key)
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self.bucket = self.api.get_bucket_by_name(self.bucket_name)
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def put_file(self, file_info):
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dest_path = os.path.join(self.path, file_info.rel_path).lstrip('/')
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self.bucket.upload_local_file(
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file_info.abs_path,
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dest_path
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)
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def purge_file(self, file_path):
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dest_path = os.path.join(self.path, file_path).lstrip('/')
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self.delete_by_path(dest_path)
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def delete_by_path(self, file_path):
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for f in self.bucket.list_file_versions(start_filename=file_path, max_entries=100)["files"]:
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if f["fileName"] == file_path:
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self.api.delete_file_version(f["fileId"], f["fileName"])
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else:
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return
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def sync(source_uri, dest_uri, account_id, app_key):
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def sync(source_uri, dest_uri, account_id, app_key, workers=10, exclude=[]):
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source = urlparse(source_uri)
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dest = urlparse(dest_uri)
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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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dest_receiver = B2Reciever(bucket=dest.netloc, path=dest.path, account_id=account_id, app_key=app_key,
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workers=workers)
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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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syncer = B2SyncManager(source_provider, dest_receiver)
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syncer = B2SyncManager(source_provider, dest_receiver, workers=workers, exclude_res=exclude)
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syncer.sync()
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11
bin/b2mirror
11
bin/b2mirror
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#!/usr/bin/env python3
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import argparse
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import re
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from b2mirror import mirror
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def main():
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parser = argparse.ArgumentParser(description="Sync data to/from B2")
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parser.add_argument("-w", "--workers", help="Maximum parallel uploads", type=int, default=10)
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parser.add_argument("-s", "--source", required=True, help="Source URI")
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parser.add_argument("-d", "--dest", required=True, help="Dest URI")
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parser.add_argument("-a", "--account-id", required=True, help="Backblaze account ID")
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parser.add_argument("-k", "--app-key", required=True, help="Backblaze application key")
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parser.add_argument("--exclude", nargs="+", help="Regexes to exclude from transfer")
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args = parser.parse_args()
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mirror.sync(args.source, args.dest, args.account_id, args.app_key)
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ignore_res = [re.compile(i) for i in args.exclude]
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mirror.sync(args.source, args.dest, args.account_id, args.app_key, workers=args.workers, exclude=ignore_res)
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if __name__ == '__main__':
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main()
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