280 lines
8.2 KiB
Python
280 lines
8.2 KiB
Python
import os
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import sqlite3
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from threading import Thread
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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, Future
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import re
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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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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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workers = 10
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def __init__(self, source_module, dest_module, exclude_res=None):
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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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] + (exclude_res if exclude_res else [])
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self._init_db()
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@staticmethod
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def dict_factory(cursor, row):
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d = {}
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for idx, col in enumerate(cursor.description):
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d[col[0]] = row[idx]
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return d
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def _init_db(self):
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c = self.db.cursor()
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def table_exists(table_name):
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c.execute("SELECT * FROM SQLITE_MASTER WHERE `type`='table' AND `name`=?", (table_name,))
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tables = c.fetchall()
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if len(tables)==0:
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return False
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return True
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tables = {
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"files": """
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CREATE TABLE `files` (
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`path` varchar(1024) PRIMARY KEY,
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`mtime` INTEGER,
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`size` INTEGER,
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`seen` BOOLEAN
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);"""
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}
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for table_name, table_create_query in tables.items():
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if not table_exists(table_name):
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c.execute(table_create_query)
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c.close()
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def sync(self):
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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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# Mark all files as unseen
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# Files will be marked as seen as they are processed
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# Later, unseen files will be purged
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c = self.db.cursor()
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row = c.execute("UPDATE 'files' SET seen=0;")
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c.close()
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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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)
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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) < 512
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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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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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def xfer_file(self, f):
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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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if not row or row['mtime'] < f.mtime:
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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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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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raise
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#print("Ok: ", f.rel_path)
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# The file was uploaded, commit it to the db
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c.execute("REPLACE INTO 'files' VALUES(?, ?, ?, ?);", (f.rel_path, f.mtime, f.size, 1))
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#print("Done: ", f.rel_path)
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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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c.close()
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return True
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def purge_remote(self):
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c = self.db.cursor()
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c_del = self.db.cursor()
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for purge_file in c.execute("SELECT * FROM 'files' WHERE seen=0;"):
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print("Delete on remote: ", purge_file["path"])
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self.dest.purge_file(purge_file["path"])
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c_del.execute("DELETE FROM 'files' WHERE path=?;", (purge_file["path"],))
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c_del.close()
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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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#print(">>> {}".format(file_info.abs_path))
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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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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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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.sync()
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