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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
syncer.py
~~~~~~~~~
sync helper
:copyright: (c) 2013-2015 by Jauhien Piatlicki
:license: GPL-2, see LICENSE for more details.
"""
import glob
import os
from .compatibility import TemporaryDirectory
from .exceptions import SyncError
from .fileutils import wget
class SyncedData(object):
"""
Synced data.
Directory with sync data is guaranted to exist only as long as this
object does.
"""
def __init__(self, directory):
self.directory = os.path.abspath(directory)
def get_path(self):
return self.directory
class TmpSyncedData(SyncedData):
"""
Synced data that lives in a temporary directory.
"""
def __init__(self, directory, tmpdirobj):
super(TmpSyncedData, self).__init__(directory)
self.tmpdirobj = tmpdirobj
class Syncer(object):
"""
Class used to sync data with remote source.
"""
def __init__(self, persistent_datadir):
self.persistent_datadir = persistent_datadir
def sync(self, db_uri, repository_config):
"""
Synchronize local directory with remote source.
Args:
db_uri: URI for synchronization with remote source.
repository_config: repository config.
Returns:
SyncedData object that gives access to the directory with data.
"""
raise NotImplementedError
class TGZSyncer(Syncer):
"""
Class used to download and unpack tarballs.
"""
def sync(self, db_uri, repository_config):
"""
Synchronize local directory with remote source.
Args:
db_uri: URI for synchronization with remote source.
repository_config: repository config.
Returns:
SyncedData object that gives access to the directory with data.
"""
download_dir = TemporaryDirectory()
if wget(db_uri, download_dir.name):
raise SyncError('sync failed: ' + db_uri)
tmp_dir = TemporaryDirectory()
for f_name in glob.iglob(os.path.join(download_dir.name, '*.tar.gz')):
if os.system("tar -xvzf " + f_name + " -C " + tmp_dir.name):
raise SyncError('sync failed (unpacking)')
tmp_path = os.path.join(tmp_dir.name, os.listdir(tmp_dir.name)[0])
del download_dir
return TmpSyncedData(tmp_path, tmp_dir)
SUPPORTED_SYNCERS = {"tgz": TGZSyncer}
# git_syncer module is optional, we should check if it is installed
try:
from .git_syncer.git_syncer import GITSyncer
SUPPORTED_SYNCERS["git"] = GITSyncer
except ImportError as e:
pass
|
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