235 lines
9.3 KiB
Python
235 lines
9.3 KiB
Python
import logging
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import os
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import time
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import sqlite3
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from twisted.internet import threads, defer
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from twisted.enterprise import adbapi
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from lbrynet.core.HashBlob import BlobFile, BlobFileCreator
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from lbrynet.core.server.DHTHashAnnouncer import DHTHashSupplier
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from lbrynet.core.sqlite_helpers import rerun_if_locked
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log = logging.getLogger(__name__)
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class DiskBlobManager(DHTHashSupplier):
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"""This class stores blobs on the hard disk"""
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def __init__(self, hash_announcer, blob_dir, db_dir):
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DHTHashSupplier.__init__(self, hash_announcer)
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self.blob_dir = blob_dir
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self.db_file = os.path.join(db_dir, "blobs.db")
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self.db_conn = adbapi.ConnectionPool('sqlite3', self.db_file, check_same_thread=False)
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self.blob_type = BlobFile
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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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log.info("Starting disk blob manager. blob_dir: %s, db_file: %s", str(self.blob_dir),
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str(self.db_file))
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yield self._open_db()
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def stop(self):
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log.info("Stopping disk blob manager.")
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self.db_conn.close()
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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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assert length is None or isinstance(length, int)
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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, 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 = self.blob_type(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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def _immediate_announce(self, blob_hashes):
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if self.hash_announcer:
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return self.hash_announcer.immediate_announce(blob_hashes)
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def blob_completed(self, blob, next_announce_time=None):
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if next_announce_time is None:
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next_announce_time = self.get_next_announce_time()
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d = self._add_completed_blob(blob.blob_hash, blob.length, next_announce_time)
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d.addCallback(lambda _: self._immediate_announce([blob.blob_hash]))
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return d
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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 hashes_to_announce(self):
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return self._get_blobs_to_announce()
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def creator_finished(self, blob_creator):
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log.debug("blob_creator.blob_hash: %s", blob_creator.blob_hash)
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assert blob_creator.blob_hash is not None
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assert blob_creator.blob_hash not in self.blobs
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assert blob_creator.length is not None
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new_blob = self.blob_type(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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self._immediate_announce([blob_creator.blob_hash])
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next_announce_time = self.get_next_announce_time()
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d = self.blob_completed(new_blob, next_announce_time)
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return d
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def immediate_announce_all_blobs(self):
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d = self._get_all_verified_blob_hashes()
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d.addCallback(self._immediate_announce)
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return d
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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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def add_blob_to_download_history(self, blob_hash, host, rate):
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d = self._add_blob_to_download_history(blob_hash, host, rate)
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return d
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def add_blob_to_upload_history(self, blob_hash, host, rate):
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d = self._add_blob_to_upload_history(blob_hash, host, rate)
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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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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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except Exception as e:
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log.warning("Failed to delete blob file. Reason: %s", e)
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yield self._delete_blobs_from_db(bh_to_delete_from_db)
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######### database calls #########
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def _open_db(self):
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# check_same_thread=False is solely to quiet a spurious error that appears to be due
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# to a bug in twisted, where the connection is closed by a different thread than the
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# one that opened it. The individual connections in the pool are not used in multiple
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# threads.
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def create_tables(transaction):
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transaction.execute("create table if not exists blobs (" +
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" blob_hash text primary key, " +
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" blob_length integer, " +
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" last_verified_time real, " +
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" next_announce_time real)")
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transaction.execute("create table if not exists download (" +
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" id integer primary key autoincrement, " +
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" blob text, " +
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" host text, " +
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" rate float, " +
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" ts integer)")
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transaction.execute("create table if not exists upload (" +
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" id integer primary key autoincrement, " +
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" blob text, " +
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" host text, " +
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" rate float, " +
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" ts integer)")
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return self.db_conn.runInteraction(create_tables)
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@rerun_if_locked
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def _add_completed_blob(self, blob_hash, length, next_announce_time):
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log.debug("Adding a completed blob. blob_hash=%s, length=%s", blob_hash, str(length))
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d = self.db_conn.runQuery(
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"insert into blobs (blob_hash, blob_length, next_announce_time) values (?, ?, ?)",
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(blob_hash, length, next_announce_time)
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)
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d.addErrback(lambda err: err.trap(sqlite3.IntegrityError))
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return d
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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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@rerun_if_locked
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def _update_blob_verified_timestamp(self, blob, timestamp):
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return self.db_conn.runQuery("update blobs set last_verified_time = ? where blob_hash = ?",
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(blob, timestamp))
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@rerun_if_locked
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def _get_blobs_to_announce(self):
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def get_and_update(transaction):
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timestamp = time.time()
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r = transaction.execute("select blob_hash from blobs " +
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"where next_announce_time < ? and blob_hash is not null",
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(timestamp,))
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blobs = [b for b, in r.fetchall()]
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next_announce_time = self.get_next_announce_time(len(blobs))
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transaction.execute(
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"update blobs set next_announce_time = ? where next_announce_time < ?",
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(next_announce_time, timestamp))
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log.debug("Got %s blobs to announce, next announce time is in %s seconds",
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len(blobs), next_announce_time-time.time())
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return blobs
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return self.db_conn.runInteraction(get_and_update)
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@rerun_if_locked
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def _delete_blobs_from_db(self, blob_hashes):
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def delete_blobs(transaction):
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for b in blob_hashes:
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transaction.execute("delete from blobs where blob_hash = ?", (b,))
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return self.db_conn.runInteraction(delete_blobs)
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@rerun_if_locked
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def _get_all_blob_hashes(self):
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d = self.db_conn.runQuery("select blob_hash from blobs")
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return d
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@rerun_if_locked
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def _get_all_verified_blob_hashes(self):
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d = self._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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@rerun_if_locked
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def _add_blob_to_download_history(self, blob_hash, host, rate):
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ts = int(time.time())
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d = self.db_conn.runQuery(
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"insert into download values (null, ?, ?, ?, ?) ",
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(blob_hash, str(host), float(rate), ts))
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return d
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@rerun_if_locked
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def _add_blob_to_upload_history(self, blob_hash, host, rate):
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ts = int(time.time())
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d = self.db_conn.runQuery(
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"insert into upload values (null, ?, ?, ?, ?) ",
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(blob_hash, str(host), float(rate), ts))
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return d
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