mirror of https://github.com/borgbackup/borg.git
Switched to a namespace base object store implementation.
This commit is contained in:
Jonas Borgström
parent
e65ed8623f
commit
5cbafdfc20
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@ -8,7 +8,8 @@ from optparse import OptionParser
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from store import Store
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CHUNKSIZE = 256 * 1024
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NS_ARCHIVES = 'ARCHIVES'
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NS_CHUNKS = 'CHUNKS'
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class Cache(object):
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"""Client Side cache
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@ -16,14 +17,14 @@ class Cache(object):
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def __init__(self, path, store):
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self.store = store
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self.path = path
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self.tid = 'unknown'
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self.tid = -1
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self.open()
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if self.tid != self.store.tid:
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print self.tid.encode('hex'), self.store.tid.encode('hex')
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print self.tid, self.store.tid
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self.create()
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def open(self):
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if self.store.tid == '':
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if self.store.tid == -1:
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return
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filename = os.path.join(self.path, '%s.cache' % self.store.uuid)
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if not os.path.exists(filename):
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@ -32,31 +33,16 @@ class Cache(object):
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data = cPickle.loads(zlib.decompress(open(filename, 'rb').read()))
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self.chunkmap = data['chunkmap']
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self.tid = data['tid']
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self.archives = data['archives']
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print 'done'
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def update_manifest(self):
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print 'old manifest', self.tid.encode('hex')
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if self.tid:
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self.chunk_decref(self.tid)
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manifest = {'archives': self.archives.values()}
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hash = self.add_chunk(zlib.compress(cPickle.dumps(manifest)))
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print 'new manifest', hash.encode('hex')
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self.store.commit(hash)
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def create(self):
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self.archives = {}
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self.chunkmap = {}
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self.tid = self.store.tid
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if self.store.tid == '':
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if self.store.tid == 0:
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return
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print 'Recreating cache...'
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self.chunk_incref(self.store.tid)
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manifest = cPickle.loads(zlib.decompress(self.store.get(self.store.tid)))
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for hash in manifest['archives']:
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self.chunk_incref(hash)
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archive = cPickle.loads(zlib.decompress(self.store.get(hash)))
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self.archives[archive['name']] = hash
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for id in self.store.list(NS_ARCHIVES):
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archive = cPickle.loads(zlib.decompress(self.store.get(NS_ARCHIVES, id)))
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for item in archive['items']:
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if item['type'] == 'FILE':
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for c in item['chunks']:
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@ -66,7 +52,7 @@ class Cache(object):
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def save(self):
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assert self.store.state == Store.OPEN
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print 'saving cache'
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data = {'chunkmap': self.chunkmap, 'tid': self.store.tid, 'archives': self.archives}
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data = {'chunkmap': self.chunkmap, 'tid': self.store.tid}
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filename = os.path.join(self.path, '%s.cache' % self.store.uuid)
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print 'Saving cache as:', filename
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with open(filename, 'wb') as fd:
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@ -76,7 +62,7 @@ class Cache(object):
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def add_chunk(self, data):
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hash = hashlib.sha1(data).digest()
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if not self.seen_chunk(hash):
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self.store.put(data, hash)
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self.store.put(NS_CHUNKS, hash, data)
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else:
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print 'seen chunk', hash.encode('hex')
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self.chunk_incref(hash)
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@ -95,7 +81,7 @@ class Cache(object):
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self.chunkmap[hash] = count
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if not count:
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print 'deleting chunk: ', hash.encode('hex')
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self.store.delete(hash)
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self.store.delete(NS_CHUNKS, hash)
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return count
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@ -106,8 +92,8 @@ class Archiver(object):
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self.cache = Cache('/tmp/cache', self.store)
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def create_archive(self, archive_name, paths):
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if archive_name in self.cache.archives:
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raise Exception('Archive "%s" already exists' % archive_name)
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# if archive_name in self.cache.archives:
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# raise Exception('Archive "%s" already exists' % archive_name)
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items = []
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for path in paths:
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for root, dirs, files in os.walk(path):
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@ -117,24 +103,21 @@ class Archiver(object):
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for f in files:
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name = os.path.join(root, f)
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items.append(self.process_file(name, self.cache))
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archive = {'name': name, 'items': items}
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hash = self.cache.add_chunk(zlib.compress(cPickle.dumps(archive)))
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self.cache.archives[archive_name] = hash
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self.cache.update_manifest()
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archive = {'name': archive_name, 'items': items}
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hash = self.store.put(NS_ARCHIVES, archive_name, zlib.compress(cPickle.dumps(archive)))
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self.store.commit()
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self.cache.save()
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def delete_archive(self, archive_name):
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hash = self.cache.archives.get(archive_name)
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if not hash:
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raise Exception('Archive "%s" does not exist' % archive_name)
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archive = cPickle.loads(zlib.decompress(self.store.get(hash)))
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self.cache.chunk_decref(hash)
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archive = cPickle.loads(zlib.decompress(self.store.get(NS_ARCHIVES, archive_name)))
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self.store.delete(NS_ARCHIVES, archive_name)
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# if not hash:
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# raise Exception('Archive "%s" does not exist' % archive_name)
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for item in archive['items']:
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if item['type'] == 'FILE':
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for c in item['chunks']:
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self.cache.chunk_decref(c)
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del self.cache.archives[archive_name]
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self.cache.update_manifest()
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self.store.commit()
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self.cache.save()
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def process_dir(self, path, cache):
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@ -17,7 +17,7 @@ class Store(object):
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VERSION = 'DEDUPSTORE VERSION 1'
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def __init__(self, path):
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self.tid = ''
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self.tid = '-1'
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self.state = Store.IDLE
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if not os.path.exists(path):
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self.create(path)
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@ -27,7 +27,7 @@ class Store(object):
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os.mkdir(path)
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open(os.path.join(path, 'version'), 'wb').write(self.VERSION)
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open(os.path.join(path, 'uuid'), 'wb').write(str(uuid.uuid4()))
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open(os.path.join(path, 'tid'), 'wb').write('')
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open(os.path.join(path, 'tid'), 'wb').write('0')
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os.mkdir(os.path.join(path, 'data'))
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def open(self, path):
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@ -40,7 +40,7 @@ class Store(object):
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self.uuid = open(os.path.join(path, 'uuid'), 'rb').read()
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self.lock_fd = open(os.path.join(path, 'lock'), 'w')
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fcntl.flock(self.lock_fd, fcntl.LOCK_EX)
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self.tid = open(os.path.join(path, 'tid'), 'r').read()
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self.tid = int(open(os.path.join(path, 'tid'), 'r').read())
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self.recover()
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def recover(self):
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@ -59,7 +59,7 @@ class Store(object):
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self.lock_fd.close()
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self.state = Store.IDLE
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def commit(self, tid):
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def commit(self):
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"""
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"""
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if self.state == Store.OPEN:
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@ -70,28 +70,29 @@ class Store(object):
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with open(os.path.join(self.path, 'txn-active', 'write_index'), 'wb') as fd:
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fd.write('\n'.join(self.txn_write))
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with open(os.path.join(self.path, 'txn-active', 'tid'), 'wb') as fd:
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fd.write(tid)
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fd.write(str(self.tid + 1))
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os.rename(os.path.join(self.path, 'txn-active'),
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os.path.join(self.path, 'txn-commit'))
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self.recover()
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def apply_txn(self):
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assert os.path.isdir(os.path.join(self.path, 'txn-commit'))
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tid = open(os.path.join(self.path, 'txn-commit', 'tid'), 'rb').read()
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tid = int(open(os.path.join(self.path, 'txn-commit', 'tid'), 'rb').read())
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assert tid == self.tid + 1
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delete_list = [line.strip() for line in
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open(os.path.join(self.path, 'txn-commit', 'delete_index'), 'rb').readlines()]
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for name in delete_list:
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path = os.path.join(self.path, 'objects', name)
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path = os.path.join(self.path, 'data', name)
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os.unlink(path)
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write_list = [line.strip() for line in
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open(os.path.join(self.path, 'txn-commit', 'write_index'), 'rb').readlines()]
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for name in write_list:
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destname = os.path.join(self.path, 'objects', name)
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destname = os.path.join(self.path, 'data', name)
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if not os.path.exists(os.path.dirname(destname)):
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os.makedirs(os.path.dirname(destname))
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os.rename(os.path.join(self.path, 'txn-commit', 'write', name), destname)
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with open(os.path.join(self.path, 'tid'), 'wb') as fd:
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fd.write(tid)
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fd.write(str(tid))
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os.rename(os.path.join(self.path, 'txn-commit'),
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os.path.join(self.path, 'txn-applied'))
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shutil.rmtree(os.path.join(self.path, 'txn-applied'))
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@ -110,60 +111,90 @@ class Store(object):
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os.mkdir(os.path.join(self.path, 'txn-active', 'write'))
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self.state = Store.ACTIVE
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def _filename(self, hash, base=''):
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hex = hash.encode('hex')
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return os.path.join(base, hex[:2], hex[2:4], hex[4:])
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def _filename(self, ns, id, base=''):
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ns = ns.encode('hex')
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id = id.encode('hex')
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return os.path.join(base, ns, id[:2], id[2:4], id[4:])
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def get(self, hash):
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def get(self, ns, id):
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"""
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"""
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path = self._filename(hash)
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path = self._filename(ns, id)
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if path in self.txn_write:
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filename = os.path.join(self.path, 'txn-active', 'write', path)
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return open(filename, 'rb').read()
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filename = self._filename(hash, os.path.join(self.path, 'objects'))
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if path in self.txn_delete:
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raise Exception('Object %s does not exist' % hash.encode('hex'))
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filename = self._filename(ns, id, os.path.join(self.path, 'data'))
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if os.path.exists(filename):
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return open(filename, 'rb').read()
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else:
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raise Exception('Object %s does not exist' % hash.encode('hex'))
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def put(self, data, hash=None):
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def put(self, ns, id, data):
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"""
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"""
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if not hash:
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hash = hashlib.sha1(data).digest()
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self.prepare_txn()
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path = self._filename(hash)
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filename = self._filename(hash, os.path.join(self.path, 'objects'))
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path = self._filename(ns, id)
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filename = self._filename(ns, id, os.path.join(self.path, 'data'))
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if (path in self.txn_write or
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(path not in self.txn_delete and os.path.exists(filename))):
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raise Exception('Object already exists: %s' % hash.encode('hex'))
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raise Exception('Object already exists: %s:%s' % (ns.encode('hex'), id.encode('hex')))
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if path in self.txn_delete:
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self.txn_delete.remove(path)
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if path not in self.txn_write:
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self.txn_write.append(path)
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filename = self._filename(hash, os.path.join(self.path, 'txn-active', 'write'))
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filename = self._filename(ns, id, os.path.join(self.path, 'txn-active', 'write'))
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if not os.path.exists(os.path.dirname(filename)):
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os.makedirs(os.path.dirname(filename))
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with open(filename, 'wb') as fd:
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fd.write(data)
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return hash
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def delete(self, hash):
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def delete(self, ns, id):
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"""
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"""
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self.prepare_txn()
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path = self._filename(hash)
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path = self._filename(ns, id)
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if path in self.txn_write:
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filename = self._filename(ns, id, os.path.join(self.path, 'txn-active', 'write'))
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self.txn_write.remove(path)
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os.unlink(filename)
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else:
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filename = os.path.join(self.path, 'objects', path)
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filename = os.path.join(self.path, 'data', path)
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if os.path.exists(filename):
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self.txn_delete.append(path)
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else:
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raise Exception('Object does not exist: %s' % hash.encode('hex'))
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def list(self, ns, prefix='', marker=None, max_keys=1000000):
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for x in self.foo(os.path.join(self.path, 'data', ns.encode('hex')),
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prefix, marker, '', max_keys):
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yield x
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def foo(self, path, prefix, marker, base, max_keys):
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n = 0
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for name in sorted(os.listdir(path)):
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if n >= max_keys:
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return
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dirs = []
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names = []
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id = name.decode('hex')
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if os.path.isdir(os.path.join(path, name)):
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if prefix and not id.startswith(prefix[:len(id)]):
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continue
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for x in self.foo(os.path.join(path, name),
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prefix[len(id):], marker,
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base + id, max_keys - n):
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yield x
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n += 1
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else:
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if prefix and not id.startswith(prefix):
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continue
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if not marker or base + id >= marker:
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yield base + id
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n += 1
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class StoreTestCase(unittest.TestCase):
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@ -175,32 +206,47 @@ class StoreTestCase(unittest.TestCase):
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shutil.rmtree(self.tmppath)
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def test1(self):
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self.assertEqual(self.store.tid, '')
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self.assertEqual(self.store.tid, 0)
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self.assertEqual(self.store.state, Store.OPEN)
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SOMEDATA_hash = self.store.put('SOMEDATA')
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self.assertRaises(Exception, lambda: self.store.put('SOMEDATA'))
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self.assertEqual(self.store.get(SOMEDATA_hash), 'SOMEDATA')
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self.store.put('SOMENS', 'SOMEID', 'SOMEDATA')
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self.assertRaises(Exception, lambda: self.store.put('SOMENS', 'SOMEID', 'SOMEDATA'))
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self.assertEqual(self.store.get('SOMENS', 'SOMEID'), 'SOMEDATA')
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self.store.rollback()
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self.assertRaises(Exception, lambda: self.store.get('SOMEDATA'))
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self.assertEqual(self.store.tid, '')
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self.assertRaises(Exception, lambda: self.store.get('SOMENS', 'SOMEID'))
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self.assertEqual(self.store.tid, 0)
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def test2(self):
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self.assertEqual(self.store.tid, '')
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self.assertEqual(self.store.tid, 0)
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self.assertEqual(self.store.state, Store.OPEN)
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SOMEDATA_hash = self.store.put('SOMEDATA')
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self.assertEqual(self.store.get(SOMEDATA_hash), 'SOMEDATA')
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self.store.commit(SOMEDATA_hash)
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self.assertEqual(self.store.tid, SOMEDATA_hash)
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self.assertEqual(self.store.get(SOMEDATA_hash), 'SOMEDATA')
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self.store.delete(SOMEDATA_hash)
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self.assertRaises(Exception, lambda: self.store.get('SOMEDATA'))
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self.store.put('SOMENS', 'SOMEID', 'SOMEDATA')
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self.assertEqual(self.store.get('SOMENS', 'SOMEID'), 'SOMEDATA')
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self.store.commit()
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self.assertEqual(self.store.tid, 1)
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self.assertEqual(self.store.get('SOMENS', 'SOMEID'), 'SOMEDATA')
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self.store.delete('SOMENS', 'SOMEID')
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self.assertRaises(Exception, lambda: self.store.get('SOMENS', 'SOMEID'))
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self.store.rollback()
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self.assertEqual(self.store.get(SOMEDATA_hash), 'SOMEDATA')
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self.store.delete(SOMEDATA_hash)
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self.assertRaises(Exception, lambda: self.store.get('SOMEDATA'))
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self.store.commit('Something Else')
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self.assertEqual(self.store.tid, 'Something Else')
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self.assertRaises(Exception, lambda: self.store.get('SOMEDATA'))
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self.assertEqual(self.store.get('SOMENS', 'SOMEID'), 'SOMEDATA')
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self.store.delete('SOMENS', 'SOMEID')
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self.assertRaises(Exception, lambda: self.store.get('SOMENS', 'SOMEID'))
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self.store.commit()
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self.assertEqual(self.store.tid, 2)
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self.assertRaises(Exception, lambda: self.store.get('SOMENS', 'SOMEID'))
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def test_list(self):
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self.store.put('SOMENS', 'SOMEID12', 'SOMEDATA')
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self.store.put('SOMENS', 'SOMEID', 'SOMEDATA')
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self.store.put('SOMENS', 'SOMEID1', 'SOMEDATA')
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self.store.put('SOMENS', 'SOMEID123', 'SOMEDATA')
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self.store.commit()
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self.assertEqual(list(self.store.list('SOMENS', max_keys=3)),
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['SOMEID', 'SOMEID1', 'SOMEID12'])
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self.assertEqual(list(self.store.list('SOMENS', marker='SOMEID12')),
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['SOMEID12', 'SOMEID123'])
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self.assertEqual(list(self.store.list('SOMENS', prefix='SOMEID1', max_keys=2)),
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['SOMEID1', 'SOMEID12'])
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self.assertEqual(list(self.store.list('SOMENS', prefix='SOMEID1', marker='SOMEID12')),
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['SOMEID12', 'SOMEID123'])
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if __name__ == '__main__':
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