Add TaskThread, use to simplify WaitingDialog
This will be useful as a client thread for hardware wallets
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@ -197,6 +197,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
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self.show()
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self.raise_()
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def on_error(self, exc_info):
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traceback.print_exception(*exc_info)
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self.show_error(str(exc_info[1]))
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def on_network(self, event, *args):
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if event == 'updated':
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self.need_update.set()
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@ -1265,12 +1269,15 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
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# call hook to see if plugin needs gui interaction
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run_hook('sign_tx', parent, tx)
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def sign_thread():
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self.wallet.sign_transaction(tx, password)
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return True
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def on_signed(result):
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callback(True)
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def on_failed(exc_info):
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self.on_error(exc_info)
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callback(False)
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WaitingDialog(parent, _('Signing transaction...'), sign_thread,
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callback)
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task = partial(self.wallet.sign_transaction, tx, password)
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WaitingDialog(parent, _('Signing transaction...'), task,
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on_signed, on_failed)
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def broadcast_transaction(self, tx, tx_desc, parent):
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@ -1309,7 +1316,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
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self.show_error(msg, parent=parent)
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WaitingDialog(parent, _('Broadcasting transaction...'),
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broadcast_thread, broadcast_done)
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broadcast_thread, broadcast_done, self.on_error)
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def prepare_for_payment_request(self):
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self.tabs.setCurrentIndex(1)
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@ -4,6 +4,8 @@ import traceback
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import sys
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import threading
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import platform
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import Queue
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from collections import namedtuple
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from functools import partial
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from electrum.i18n import _
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@ -211,39 +213,26 @@ class WindowModalDialog(QDialog, MessageBoxMixin):
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if title:
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self.setWindowTitle(title)
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class WaitingDialog(QThread, MessageBoxMixin):
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class WaitingDialog(WindowModalDialog):
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'''Shows a please wait dialog whilst runnning a task. It is not
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necessary to maintain a reference to this dialog.'''
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def __init__(self, parent, message, task, on_finished=None):
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global dialogs
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dialogs.append(self) # Prevent GC
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QThread.__init__(self)
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self.task = task
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self.on_finished = on_finished
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self.dialog = WindowModalDialog(parent, _("Please wait"))
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vbox = QVBoxLayout(self.dialog)
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def __init__(self, parent, message, task, on_success=None, on_error=None):
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assert parent
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WindowModalDialog.__init__(self, parent, _("Please wait"))
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vbox = QVBoxLayout(self)
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vbox.addWidget(QLabel(message))
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self.dialog.show()
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self.dialog.connect(self, SIGNAL("finished()"), self.finished)
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self.start()
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self.accepted.connect(self.on_accepted)
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self.show()
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self.thread = TaskThread(self)
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self.thread.add(task, on_success, self.accept, on_error)
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def run(self):
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try:
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self.result = self.task()
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self.error = None
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except BaseException as e:
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traceback.print_exc(file=sys.stdout)
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self.error = str(e)
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self.result = None
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def wait(self):
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self.thread.wait()
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def on_accepted(self):
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self.thread.stop()
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def finished(self):
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global dialogs
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dialogs.remove(self)
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self.dialog.accept()
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if self.error:
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self.show_error(self.error, parent=self.dialog.parent())
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if self.on_finished:
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self.on_finished(self.result)
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def line_dialog(parent, title, label, ok_label, default=None):
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dialog = WindowModalDialog(parent, title)
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@ -548,6 +537,46 @@ class ButtonsTextEdit(QPlainTextEdit, ButtonsWidget):
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return o
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class TaskThread(QThread):
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'''Thread that runs background tasks. Callbacks are guaranteed
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to happen in the context of its parent.'''
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Task = namedtuple("Task", "task cb_success cb_done cb_error")
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doneSig = pyqtSignal(object, object, object)
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def __init__(self, parent, on_error=None):
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super(TaskThread, self).__init__(parent)
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self.on_error = on_error
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self.tasks = Queue.Queue()
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self.doneSig.connect(self.on_done)
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self.start()
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def add(self, task, on_success=None, on_done=None, on_error=None):
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on_error = on_error or self.on_error
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self.tasks.put(TaskThread.Task(task, on_success, on_done, on_error))
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def run(self):
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while True:
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task = self.tasks.get()
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if not task:
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break
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try:
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result = task.task()
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self.doneSig.emit(result, task.cb_done, task.cb_success)
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except BaseException:
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self.doneSig.emit(sys.exc_info(), task.cb_done, task.cb_error)
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def on_done(self, result, cb_done, cb):
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# This runs in the parent's thread.
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if cb_done:
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cb_done()
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if cb:
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cb(result)
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def stop(self):
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self.tasks.put(None)
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if __name__ == "__main__":
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app = QApplication([])
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t = WaitingDialog(None, 'testing ...', lambda: [time.sleep(1)], lambda x: QMessageBox.information(None, 'done', "done", _('OK')))
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