139 lines
5.4 KiB
Python
139 lines
5.4 KiB
Python
import logging
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import os
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from binascii import unhexlify
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from sqlite3 import IntegrityError
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from twisted.internet import threads, defer
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from lbrynet.blob.blob_file import BlobFile
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from lbrynet.blob.creator import BlobFileCreator
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log = logging.getLogger(__name__)
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class DiskBlobManager:
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def __init__(self, blob_dir, storage, node_datastore=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.storage = storage
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self.blob_dir = blob_dir
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self._node_datastore = node_datastore
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self.blob_creator_type = BlobFileCreator
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# TODO: consider using an LRU for blobs as there could potentially
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# be thousands of blobs loaded up, many stale
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self.blobs = {}
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self.blob_hashes_to_delete = {} # {blob_hash: being_deleted (True/False)}
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@defer.inlineCallbacks
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def setup(self):
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if self._node_datastore is not None:
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raw_blob_hashes = yield self.storage.get_all_finished_blobs()
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self._node_datastore.completed_blobs.update(raw_blob_hashes)
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defer.returnValue(True)
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def stop(self):
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return defer.succeed(True)
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def get_blob(self, blob_hash, length=None):
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"""Return a blob identified by blob_hash, which may be a new blob or a
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blob that is already on the hard disk
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"""
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if length is not None and not isinstance(length, int):
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raise Exception("invalid length type: {} ({})".format(length, str(type(length))))
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if blob_hash in self.blobs:
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return defer.succeed(self.blobs[blob_hash])
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return self._make_new_blob(blob_hash, length)
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def get_blob_creator(self):
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return self.blob_creator_type(self.blob_dir)
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def _make_new_blob(self, blob_hash, length=None):
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log.debug('Making a new blob for %s', blob_hash)
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blob = BlobFile(self.blob_dir, blob_hash, length)
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self.blobs[blob_hash] = blob
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return defer.succeed(blob)
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@defer.inlineCallbacks
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def blob_completed(self, blob, should_announce=False, next_announce_time=None):
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yield self.storage.add_completed_blob(
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blob.blob_hash, blob.length, next_announce_time, should_announce
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)
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if self._node_datastore is not None:
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self._node_datastore.completed_blobs.add(unhexlify(blob.blob_hash))
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def completed_blobs(self, blobhashes_to_check):
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return self._completed_blobs(blobhashes_to_check)
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def count_should_announce_blobs(self):
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return self.storage.count_should_announce_blobs()
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def set_should_announce(self, blob_hash, should_announce):
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now = self.storage.clock.seconds()
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return self.storage.set_should_announce(blob_hash, now, should_announce)
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def get_should_announce(self, blob_hash):
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return self.storage.should_announce(blob_hash)
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def creator_finished(self, blob_creator, should_announce):
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log.debug("blob_creator.blob_hash: %s", blob_creator.blob_hash)
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if blob_creator.blob_hash is None:
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raise Exception("Blob hash is None")
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if blob_creator.blob_hash in self.blobs:
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raise Exception("Creator finished for blob that is already marked as completed")
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if blob_creator.length is None:
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raise Exception("Blob has a length of 0")
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new_blob = BlobFile(self.blob_dir, blob_creator.blob_hash, blob_creator.length)
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self.blobs[blob_creator.blob_hash] = new_blob
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return self.blob_completed(new_blob, should_announce)
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def get_all_verified_blobs(self):
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d = self._get_all_verified_blob_hashes()
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d.addCallback(self.completed_blobs)
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return d
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@defer.inlineCallbacks
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def delete_blobs(self, blob_hashes):
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bh_to_delete_from_db = []
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for blob_hash in blob_hashes:
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if not blob_hash:
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continue
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if self._node_datastore is not None:
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try:
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self._node_datastore.completed_blobs.remove(unhexlify(blob_hash))
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except KeyError:
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pass
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try:
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blob = yield self.get_blob(blob_hash)
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yield blob.delete()
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bh_to_delete_from_db.append(blob_hash)
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del self.blobs[blob_hash]
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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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try:
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yield 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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@defer.inlineCallbacks
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def _completed_blobs(self, blobhashes_to_check):
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"""Returns of the blobhashes_to_check, which are valid"""
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blobs = yield defer.DeferredList([self.get_blob(b) for b in blobhashes_to_check])
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blob_hashes = [b.blob_hash for success, b in blobs if success and b.verified]
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defer.returnValue(blob_hashes)
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def _get_all_verified_blob_hashes(self):
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d = self.storage.get_all_blob_hashes()
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def get_verified_blobs(blobs):
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verified_blobs = []
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for blob_hash in blobs:
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file_path = os.path.join(self.blob_dir, blob_hash)
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if os.path.isfile(file_path):
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verified_blobs.append(blob_hash)
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return verified_blobs
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d.addCallback(lambda blobs: threads.deferToThread(get_verified_blobs, blobs))
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return d
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