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#
# Copyright (C) 2010 Anton Khirnov <anton@khirnov.net>
#
# Nephilim is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Nephilim is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Nephilim. If not, see <http://www.gnu.org/licenses/>.
#
from PyQt5 import QtCore, QtNetwork
from PyQt5.QtCore import pyqtSignal as Signal
from .song import Song
class MetadataFetcher(QtCore.QObject):
"""
A basic class for metadata fetchers. Provides a fetch(song) function,
emits a finished(song, metadata) signal when done.
"""
#public, read-only
logger = None
name = ''
#private
nam = None # NetworkAccessManager
rep = None # current NetworkReply.
song = None # current song
# SIGNALS
finished = Signal([Song, object])
#### private ####
def __init__(self, plugin):
QtCore.QObject.__init__(self, plugin)
self.nam = QtNetwork.QNetworkAccessManager()
self.logger = plugin.logger
def fetch2(self, song, url):
"""A private convenience function to initiate fetch process."""
# abort any existing connections
self.abort()
self.song = song
self.logger.info('Searching %s: %s.'%(self. name, url.toString()))
self.rep = self.nam.get(QtNetwork.QNetworkRequest(url))
self.rep.error.connect(self.handle_error)
def finish(self, metadata = None):
"""A private convenience function to clean up and emit finished().
Feel free to reimplement/not use it."""
self.rep = None
self.finished.emit(self.song, metadata)
self.song = None
def handle_error(self):
"""Print the error and abort."""
self.logger.error(self.rep.errorString())
self.abort()
self.finish()
#### public ####
def fetch(self, song):
"""Reimplement this in subclasses."""
pass
def abort(self):
"""Abort all downloads currently in progress."""
if self.rep:
self.rep.blockSignals(True)
self.rep.abort()
self.rep = None
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