234 lines
7.4 KiB
Python
Executable File
234 lines
7.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import sys
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import traceback
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from os import mkdir, rename, unlink, rmdir, utime
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from os.path import exists
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from os.path import join as pathjoin
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from common.cgi import parse_qs, parse_auth, start_response
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from common.datadb import DATADB_ROOT, DATADB_TMP, DATADB_DIR_TIMESTAMP_FORMAT, get_backup_dir, get_latest_backup, \
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NoBackupException
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from datetime import datetime
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from shutil import rmtree, move
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from subprocess import Popen, PIPE
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from random import randint
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from time import time
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from hashlib import md5
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from glob import iglob
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import json
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def rotate_backups(backup_dir, max_backups=5):
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"""
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In the backup dir, cascade backups. List the backup dir and parse folder timestamps. Sort and delete old.
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Create a symlink pointing to the newest backup
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:param backup_dir: absolute path to dir containing the numbered dirs we will be rotating
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:param max_backups: Max number of dirs to keep
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:returns: Full path of new data dir
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"""
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# Path to this profile's backup data dir
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# profile_base_path = pathjoin(DATADB_ROOT, backup_name, 'data')
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dirs = sorted([datetime.strptime(d, DATADB_DIR_TIMESTAMP_FORMAT) for d in os.listdir(backup_dir)])
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dirs.reverse()
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# we the list of dirs sorted newest to oldest
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if len(dirs) > max_backups:
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for dirname in dirs[max_backups:]:
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rmtree(pathjoin(backup_dir, dirname.strftime(DATADB_DIR_TIMESTAMP_FORMAT)))
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return prepare_new_backup_dir(backup_dir)
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def prepare_new_backup_dir(backup_dir):
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# Create the new backup dir
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new_backup_path = pathjoin(backup_dir, datetime.now().strftime(DATADB_DIR_TIMESTAMP_FORMAT))
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mkdir(new_backup_path)
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mkdir(pathjoin(new_backup_path, "data"))
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return new_backup_path + '/data/'
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def prepare_backup_dirs(backup_name, max_backups=5, rotate=True):
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"""
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Check and create dirs where backups under this name will go
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:param backup_name: name of backup profile
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:returns: absolute path to newly created backup dir (0)
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"""
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# print("prepare_backup(%s, %s)" % (backup_name, proto))
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# Ensure the following dir exists: <DATADB_ROOT>/<backup_name>/data/
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backup_base_path = get_backup_dir(backup_name)
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if not exists(backup_base_path):
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mkdir(backup_base_path)
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backup_data_path = pathjoin(backup_base_path, 'data')
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if not exists(backup_data_path):
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mkdir(backup_data_path)
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if not rotate:
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# Get the path to the latest backup if using in place mode
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# If no backup is found, we'll call the rotate function anyway to get one created
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try:
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return get_latest_backup(backup_name)
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except NoBackupException:
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pass
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return rotate_backups(backup_data_path, max_backups=max_backups)
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def handle_get_rsync(backup_name, sync_prev=False, force_existing=False):
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"""
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Prepare a temp dest dir for an incoming rsync backup
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:param backup_name: name of backup profile
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:param sync_prev: disk copy the previous backup that will be rsynced on top of to save bandwidth
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:param force_existing: force using existing backups (ideal for single in-place backups of very large things)
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"""
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if force_existing:
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backup_0 = prepare_backup_dirs(backup_name, max_backups=1, rotate=False)
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# touch the backup dir
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utime(get_backup_dir(backup_name))
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start_response()
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print(json.dumps([backup_0, None]))
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exit(0)
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# generate random token
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now = int(time())
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token = md5()
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token.update("{}{}{}".format(now, backup_name, randint(0, 999999999)).encode("UTF-8"))
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token = "{}.{}".format(token.hexdigest(), now)
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# create tmpdir using token
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backup_dir = pathjoin(DATADB_TMP, token)
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os.mkdir(backup_dir)
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if sync_prev:
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prev_path = pathjoin(get_backup_dir(backup_name), 'data', '0', 'data')
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if exists(prev_path):
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# if we're using rsync let's cp -r the previous backup to the empty new dir.
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# this should save some network time rsyncing later
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#copytree(prev_backup_path, new_backup_path)
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cp = Popen(['rsync', '-avr', '--one-file-system', prev_path+'/', backup_dir+'/'],
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stdout=PIPE, stderr=PIPE)
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cp.communicate()
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# return both to requester
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start_response()
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print(json.dumps([backup_dir, token]))
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exit(0)
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def handle_put_rsync(backup_name, tmp_token, max_backups):
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"""
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Requested after rsync has completed successfully on the client end. Moves
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files from tmp dir identififed by tmp_token, to a final location prepared by
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rotating backups
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"""
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# Prepare new dir
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new_target_dir = prepare_backup_dirs(backup_name, max_backups=max_backups)
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# find tmp dir
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tmp_dir = pathjoin(DATADB_TMP, tmp_token)
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# move its contents
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contents = iglob(pathjoin(tmp_dir, '*'))
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for f in contents:
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# chop off leading path that iglob adds
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f = f[len(tmp_dir)+1:]
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move(
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pathjoin(tmp_dir, f),
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pathjoin(new_target_dir, f)
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)
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# delete temp dir
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rmdir(tmp_dir)
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# touch the backup dir
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utime(get_backup_dir(backup_name))
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# Print confirmation
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start_response()
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print("OK")
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exit(0)
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def handle_put_archive(backup_name, fileStream, max_backups):
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"""
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Prepare and accept a new archive backup - a single tar.gz archive.
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:param backup_name: profile the new file will be added to
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:param fileStream: file-like object to read archive data from, to disk
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"""
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# Temp file we will store data in as it is uploaded
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tmp_fname = pathjoin(DATADB_TMP, "%s.tar.gz" % time())
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# Track uploaded data size
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bk_size = 0
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with open(tmp_fname, 'wb') as f:
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while True:
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data = fileStream.read(8192)
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if not data:
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break
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bk_size += len(data)
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f.write(data)
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# No data = assume something failed
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if bk_size == 0:
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unlink(tmp_fname)
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raise Exception("No file uploaded...")
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new_target_dir = prepare_backup_dirs(backup_name, max_backups=max_backups)
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# Move backup into place
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rename(tmp_fname, pathjoin(new_target_dir, 'backup.tar.gz'))
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# touch the backup dir
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utime(get_backup_dir(backup_name))
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# Done
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start_response() # send 200 response code
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exit(0)
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def handle_req():
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"""
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Parse http query parameters and act accordingly.
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"""
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params = parse_qs()
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for param_name in ["proto", "name"]:
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if param_name not in params:
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raise Exception("Missing parameter: %s" % param_name)
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max_backups = int(params["keep"]) if "keep" in params else 5
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assert max_backups > 0, "Must keep at least one backup"
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if os.environ['REQUEST_METHOD'] == "GET" and params["proto"] == "rsync":
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# Rsync prepare is GET
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handle_get_rsync(params["name"], sync_prev=True, force_existing="inplace" in params)
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elif os.environ['REQUEST_METHOD'] == "PUT" and params["proto"] == "rsync":
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# Rsync finalize is PUT
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handle_put_rsync(params["name"], params["token"], max_backups)
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elif os.environ['REQUEST_METHOD'] == "PUT" and params["proto"] == "archive":
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# Archive mode PUTs a file
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handle_put_archive(params["name"], sys.stdin.buffer, max_backups)
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else:
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raise Exception("Invalid request. Params: %s" % params)
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if __name__ == "__main__":
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try:
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handle_req()
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except Exception as e:
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start_response(status_code=("500", "Internal server error"))
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tb = traceback.format_exc()
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print(tb)
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