def __init__(self, loop: asyncio.BaseEventLoop, blob_dir: str, storage: 'SQLiteStorage', config: 'Config',
node_data_store: typing.Optional['DictDataStore'] = None):
"""
This class stores blobs on the hard disk
blob_dir - directory where blobs are stored
storage - SQLiteStorage object
"""
self.loop = loop
self.blob_dir = blob_dir
self.storage = storage
self._node_data_store = node_data_store
self.completed_blob_hashes: typing.Set[str] = set() if not self._node_data_store\
else self._node_data_store.completed_blobs
self.blobs: typing.Dict[str, AbstractBlob] = {}
self.config = config
self.decrypted_blob_lru_cache = None if not self.config.blob_lru_cache_size else LRUCache(
self.config.blob_lru_cache_size)
self.connection_manager = ConnectionManager(loop)
class BlobManager:
def __init__(self, loop: asyncio.BaseEventLoop, blob_dir: str, storage: 'SQLiteStorage', config: 'Config',
node_data_store: typing.Optional['DictDataStore'] = None):
"""
This class stores blobs on the hard disk
blob_dir - directory where blobs are stored
storage - SQLiteStorage object
"""
self.loop = loop
self.blob_dir = blob_dir
self.storage = storage
self._node_data_store = node_data_store
self.completed_blob_hashes: typing.Set[str] = set() if not self._node_data_store\
else self._node_data_store.completed_blobs
self.blobs: typing.Dict[str, AbstractBlob] = {}
self.config = config
self.decrypted_blob_lru_cache = None if not self.config.blob_lru_cache_size else LRUCache(
self.config.blob_lru_cache_size)
self.connection_manager = ConnectionManager(loop)
def _get_blob(self, blob_hash: str, length: typing.Optional[int] = None):
if self.config.save_blobs:
return BlobFile(
self.loop, blob_hash, length, self.blob_completed, self.blob_dir
)
else:
if is_valid_blobhash(blob_hash) and os.path.isfile(os.path.join(self.blob_dir, blob_hash)):
return BlobFile(
self.loop, blob_hash, length, self.blob_completed, self.blob_dir
)
return BlobBuffer(
self.loop, blob_hash, length, self.blob_completed, self.blob_dir
)
def get_blob(self, blob_hash, length: typing.Optional[int] = None):
if blob_hash in self.blobs:
if self.config.save_blobs and isinstance(self.blobs[blob_hash], BlobBuffer):
buffer = self.blobs.pop(blob_hash)
if blob_hash in self.completed_blob_hashes:
self.completed_blob_hashes.remove(blob_hash)
self.blobs[blob_hash] = self._get_blob(blob_hash, length)
if buffer.is_readable():
with buffer.reader_context() as reader:
self.blobs[blob_hash].write_blob(reader.read())
if length and self.blobs[blob_hash].length is None:
self.blobs[blob_hash].set_length(length)
else:
self.blobs[blob_hash] = self._get_blob(blob_hash, length)
return self.blobs[blob_hash]
def is_blob_verified(self, blob_hash: str, length: typing.Optional[int] = None) -> bool:
if not is_valid_blobhash(blob_hash):
raise ValueError(blob_hash)
if not os.path.isfile(os.path.join(self.blob_dir, blob_hash)):
return False
if blob_hash in self.blobs:
return self.blobs[blob_hash].get_is_verified()
return self._get_blob(blob_hash, length).get_is_verified()
async def setup(self) -> bool:
def get_files_in_blob_dir() -> typing.Set[str]:
if not self.blob_dir:
return set()
return {
item.name for item in os.scandir(self.blob_dir) if is_valid_blobhash(item.name)
}
in_blobfiles_dir = await self.loop.run_in_executor(None, get_files_in_blob_dir)
to_add = await self.storage.sync_missing_blobs(in_blobfiles_dir)
if to_add:
self.completed_blob_hashes.update(to_add)
if self.config.track_bandwidth:
self.connection_manager.start()
return True
def stop(self):
self.connection_manager.stop()
while self.blobs:
_, blob = self.blobs.popitem()
blob.close()
self.completed_blob_hashes.clear()
def get_stream_descriptor(self, sd_hash):
return StreamDescriptor.from_stream_descriptor_blob(self.loop, self.blob_dir, self.get_blob(sd_hash))
def blob_completed(self, blob: AbstractBlob) -> asyncio.Task:
if blob.blob_hash is None:
raise Exception("Blob hash is None")
if not blob.length:
raise Exception("Blob has a length of 0")
if isinstance(blob, BlobFile):
if blob.blob_hash not in self.completed_blob_hashes:
self.completed_blob_hashes.add(blob.blob_hash)
return self.loop.create_task(self.storage.add_blobs((blob.blob_hash, blob.length), finished=True))
else:
return self.loop.create_task(self.storage.add_blobs((blob.blob_hash, blob.length), finished=False))
def check_completed_blobs(self, blob_hashes: typing.List[str]) -> typing.List[str]:
"""Returns of the blobhashes_to_check, which are valid"""
return [blob_hash for blob_hash in blob_hashes if self.is_blob_verified(blob_hash)]
def delete_blob(self, blob_hash: str):
if not is_valid_blobhash(blob_hash):
raise Exception("invalid blob hash to delete")
if blob_hash not in self.blobs:
if self.blob_dir and os.path.isfile(os.path.join(self.blob_dir, blob_hash)):
os.remove(os.path.join(self.blob_dir, blob_hash))
else:
self.blobs.pop(blob_hash).delete()
if blob_hash in self.completed_blob_hashes:
self.completed_blob_hashes.remove(blob_hash)
async def delete_blobs(self, blob_hashes: typing.List[str], delete_from_db: typing.Optional[bool] = True):
for blob_hash in blob_hashes:
self.delete_blob(blob_hash)
if delete_from_db:
await self.storage.delete_blobs_from_db(blob_hashes)