import os import logging import traceback from binascii import hexlify, unhexlify from twisted.internet import defer, threads from lbrynet.p2p.StreamDescriptor import save_sd_info from lbrynet.blob.client.CryptStreamDownloader import CryptStreamDownloader from lbrynet.p2p.client.StreamProgressManager import FullStreamProgressManager from lbrynet.p2p.Error import FileOpenError from lbrynet.blob.client.EncryptedFileMetadataHandler import EncryptedFileMetadataHandler log = logging.getLogger(__name__) class EncryptedFileDownloader(CryptStreamDownloader): """Classes which inherit from this class download LBRY files""" def __init__(self, stream_hash, peer_finder, rate_limiter, blob_manager, storage, payment_rate_manager, wallet, key, stream_name, file_name): super().__init__(peer_finder, rate_limiter, blob_manager, payment_rate_manager, wallet, key, stream_name) self.stream_hash = stream_hash self.storage = storage self.file_name = os.path.basename(unhexlify(file_name).decode()) self._calculated_total_bytes = None @defer.inlineCallbacks def delete_data(self): crypt_infos = yield self.storage.get_blobs_for_stream(self.stream_hash) blob_hashes = [b.blob_hash for b in crypt_infos if b.blob_hash] sd_hash = yield self.storage.get_sd_blob_hash_for_stream(self.stream_hash) blob_hashes.append(sd_hash) yield self.blob_manager.delete_blobs(blob_hashes) def stop(self, err=None): d = self._close_output() d.addCallback(lambda _: CryptStreamDownloader.stop(self, err=err)) return d def _get_progress_manager(self, download_manager): return FullStreamProgressManager(self._finished_downloading, self.blob_manager, download_manager) def _start(self): def check_start_succeeded(success): if success: self.starting = False self.stopped = False self.completed = False return True else: return self._start_failed() self.download_manager = self._get_download_manager() d = self._setup_output() d.addCallback(lambda _: self.download_manager.start_downloading()) d.addCallbacks(check_start_succeeded) return d def _setup_output(self): pass def _close_output(self): pass def get_total_bytes(self): d = self.storage.get_blobs_for_stream(self.stream_hash) def calculate_size(blobs): return sum([b.length for b in blobs]) d.addCallback(calculate_size) return d def get_total_bytes_cached(self): if self._calculated_total_bytes is None or self._calculated_total_bytes == 0: if self.download_manager is None: return 0 else: self._calculated_total_bytes = self.download_manager.calculate_total_bytes() return self._calculated_total_bytes def get_bytes_left_to_output(self): if self.download_manager is not None: return self.download_manager.calculate_bytes_left_to_output() else: return 0 def get_bytes_left_to_download(self): if self.download_manager is not None: return self.download_manager.calculate_bytes_left_to_download() else: return 0 def _get_metadata_handler(self, download_manager): return EncryptedFileMetadataHandler(self.stream_hash, self.storage, download_manager) class EncryptedFileDownloaderFactory: #implements(IStreamDownloaderFactory) def __init__(self, peer_finder, rate_limiter, blob_manager, storage, wallet): self.peer_finder = peer_finder self.rate_limiter = rate_limiter self.blob_manager = blob_manager self.storage = storage self.wallet = wallet def can_download(self, sd_validator): return True def make_downloader(self, metadata, options, payment_rate_manager, **kwargs): assert len(options) == 1 data_rate = options[0] payment_rate_manager.min_blob_data_payment_rate = data_rate def save_source_if_blob(stream_hash): return defer.succeed(metadata.source_blob_hash) def create_downloader(stream_hash): downloader = self._make_downloader(stream_hash, payment_rate_manager, metadata.validator.raw_info) return defer.succeed(downloader) d = save_sd_info(self.blob_manager, metadata.source_blob_hash, metadata.validator.raw_info) d.addCallback(save_source_if_blob) d.addCallback(create_downloader) return d def _make_downloader(self, stream_hash, payment_rate_manager, stream_info): pass class EncryptedFileSaver(EncryptedFileDownloader): def __init__(self, stream_hash, peer_finder, rate_limiter, blob_manager, storage, payment_rate_manager, wallet, download_directory, key, stream_name, file_name): super().__init__(stream_hash, peer_finder, rate_limiter, blob_manager, storage, payment_rate_manager, wallet, key, stream_name, file_name) self.download_directory = unhexlify(download_directory).decode() self.file_written_to = os.path.join(self.download_directory, unhexlify(file_name).decode()) self.file_handle = None def __str__(self): return str(self.file_written_to) def stop(self, err=None): d = EncryptedFileDownloader.stop(self, err=err) return d def _get_progress_manager(self, download_manager): return FullStreamProgressManager(self._finished_downloading, self.blob_manager, download_manager) def _setup_output(self): def open_file(): if self.file_handle is None: file_written_to = os.path.join(self.download_directory, self.file_name) try: self.file_handle = open(file_written_to, 'wb') self.file_written_to = file_written_to except IOError: log.error(traceback.format_exc()) raise FileOpenError( "Failed to open %s. Make sure you have permission to save files to that" " location." % file_written_to ) return threads.deferToThread(open_file) def _close_output(self): self.file_handle, file_handle = None, self.file_handle def close_file(): if file_handle is not None: name = file_handle.name file_handle.close() if self.completed is False: os.remove(name) return threads.deferToThread(close_file) def _get_write_func(self): def write_func(data): if self.stopped is False and self.file_handle is not None: self.file_handle.write(data) return write_func class EncryptedFileSaverFactory(EncryptedFileDownloaderFactory): def __init__(self, peer_finder, rate_limiter, blob_manager, storage, wallet, download_directory): super().__init__(peer_finder, rate_limiter, blob_manager, storage, wallet) self.download_directory = hexlify(download_directory.encode()) def _make_downloader(self, stream_hash, payment_rate_manager, stream_info): stream_name = stream_info.raw_info['stream_name'] key = stream_info.raw_info['key'] suggested_file_name = stream_info.raw_info['suggested_file_name'] return EncryptedFileSaver( stream_hash, self.peer_finder, self.rate_limiter, self.blob_manager, self.storage, payment_rate_manager, self.wallet, self.download_directory, key=key, stream_name=stream_name, file_name=suggested_file_name ) @staticmethod def get_description(): return "Save"