forked from LBRYCommunity/lbry-sdk
86 lines
3.5 KiB
Python
86 lines
3.5 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 sqlite3 import IntegrityError
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from lbrynet.extras.daemon.storage import SQLiteStorage
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from lbrynet.blob.blob_file import BlobFile, is_valid_blobhash
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from lbrynet.stream.descriptor import StreamDescriptor
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if typing.TYPE_CHECKING:
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from lbrynet.dht.protocol.data_store import DictDataStore
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log = logging.getLogger(__name__)
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class BlobFileManager:
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def __init__(self, loop: asyncio.BaseEventLoop, blob_dir: str, storage: SQLiteStorage,
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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, BlobFile] = {}
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async def setup(self) -> bool:
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def initialize_blob_hashes():
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self.completed_blob_hashes.update(
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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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await self.loop.run_in_executor(None, initialize_blob_hashes)
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return True
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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 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] = BlobFile(self.loop, self.blob_dir, blob_hash, length, self.blob_completed)
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return self.blobs[blob_hash]
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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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async def blob_completed(self, blob: BlobFile):
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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 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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await self.storage.add_completed_blob(blob.blob_hash)
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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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blobs = [self.get_blob(b) for b in blob_hashes]
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return [blob.blob_hash for blob in blobs if blob.get_is_verified()]
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async def delete_blob(self, blob_hash: str):
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try:
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blob = self.get_blob(blob_hash)
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await blob.delete()
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except Exception as e:
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log.warning("Failed to delete blob file. Reason: %s", e)
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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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if blob_hash in self.blobs:
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del self.blobs[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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bh_to_delete_from_db = []
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await asyncio.gather(*map(self.delete_blob, blob_hashes), loop=self.loop)
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if delete_from_db:
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try:
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await self.storage.delete_blobs_from_db(bh_to_delete_from_db)
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except IntegrityError as err:
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if str(err) != "FOREIGN KEY constraint failed":
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raise err
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