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