noisicaa/noisicaa/ui/editor_app.py

#!/usr/bin/python3

# @begin:license
#
# Copyright (c) 2015-2018, Benjamin Niemann <pink@odahoda.de>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# @end:license

import logging
import os
import pprint
import sys
import traceback
import types
from typing import Any, Optional, Dict, Callable, Sequence, Type

from PyQt5 import QtCore
from PyQt5 import QtWidgets

from noisicaa import audioproc
from noisicaa import instrument_db
from noisicaa import node_db
from noisicaa import devices
from noisicaa import core
from noisicaa import lv2
from noisicaa import runtime_settings as runtime_settings_lib
from ..exceptions import RestartAppException, RestartAppCleanException
from ..constants import EXIT_EXCEPTION, EXIT_RESTART, EXIT_RESTART_CLEAN
from .editor_window import EditorWindow

from . import audio_thread_profiler
from . import project_registry
from . import pipeline_perf_monitor
from . import stat_monitor
from . import ui_base

logger = logging.getLogger('ui.editor_app')


class ExceptHook(object):
    def __init__(self, app: 'EditorApp') -> None:
        self.app = app

    def __call__(
            self, exc_type: Type[BaseException], exc_value: BaseException, tb: types.TracebackType
    ) -> None:
        if issubclass(exc_type, RestartAppException):
            self.app.quit(EXIT_RESTART)
            return
        if issubclass(exc_type, RestartAppCleanException):
            self.app.quit(EXIT_RESTART_CLEAN)
            return

        msg = ''.join(traceback.format_exception(exc_type, exc_value, tb))

        logger.error("Uncaught exception:\n%s", msg)
        self.app.crashWithMessage("Uncaught exception", msg)


class AudioProcClientImpl(audioproc.AudioProcClientBase):  # pylint: disable=abstract-method
    async def setup(self) -> None:
        pass

    async def cleanup(self) -> None:
        pass

class AudioProcClient(audioproc.AudioProcClientMixin, AudioProcClientImpl):
    pass


class QApplication(QtWidgets.QApplication):
    def __init__(self) -> None:
        super().__init__(['noisicaä'])

        self.setQuitOnLastWindowClosed(False)


class EditorApp(ui_base.AbstractEditorApp):
    def __init__(
            self, *,
            qt_app: QtWidgets.QApplication,
            process: core.ProcessBase,
            paths: Sequence[str],
            runtime_settings: runtime_settings_lib.RuntimeSettings,
            settings: Optional[QtCore.QSettings] = None
    ) -> None:
        self.__context = ui_base.CommonContext(app=self)

        super().__init__()

        self.paths = paths
        self.qt_app = qt_app
        self.process = process
        self.runtime_settings = runtime_settings

        if settings is None:
            settings = QtCore.QSettings('odahoda.de', 'noisicaä')
            if runtime_settings.start_clean:
                settings.clear()
        self.settings = settings
        self.dumpSettings()

        self.project_registry = None  # type: project_registry.ProjectRegistry
        self.sequencer = None  # type: devices.AlsaSequencer
        self.midi_hub = None  # type: devices.MidiHub
        self.show_edit_areas_action = None  # type: QtWidgets.QAction
        self.__audio_thread_profiler = None  # type: audio_thread_profiler.AudioThreadProfiler
        self.profile_audio_thread_action = None  # type: QtWidgets.QAction
        self.audioproc_client = None  # type: AudioProcClient
        self.audioproc_process = None  # type: str
        self.node_db = None  # type: node_db.NodeDBClient
        self.instrument_db = None  # type: instrument_db.InstrumentDBClient
        self.urid_mapper = None  # type: lv2.ProxyURIDMapper
        self.__clipboard = None  # type: Any
        self.__old_excepthook = None  # type: Callable[[Type[BaseException], BaseException, types.TracebackType], None]
        self.win = None  # type: EditorWindow
        self.pipeline_perf_monitor = None  # type: pipeline_perf_monitor.PipelinePerfMonitor
        self.stat_monitor = None  # type: stat_monitor.StatMonitor
        self.default_style = None  # type: str
        self.node_messages = core.CallbackMap[str, Dict[str, Any]]()

        self.__player_state_listeners = core.CallbackMap[str, audioproc.EngineNotification]()

    @property
    def context(self) -> ui_base.CommonContext:
        return self.__context

    async def setup(self) -> None:
        logger.info("Installing custom excepthook.")
        self.__old_excepthook = sys.excepthook
        sys.excepthook = ExceptHook(self)  # type: ignore

        await self.createNodeDB()
        await self.createInstrumentDB()
        await self.createURIDMapper()

        self.project_registry = project_registry.ProjectRegistry(
            self.process.event_loop, self.process.tmp_dir, self.process.manager, self.node_db)

        self.sequencer = self.createSequencer()

        self.midi_hub = self.createMidiHub()
        self.midi_hub.start()

        # TODO: 'self' is not a QObject in this context.
        self.show_edit_areas_action = QtWidgets.QAction("Show Edit Areas", self.qt_app)
        self.show_edit_areas_action.setCheckable(True)
        self.show_edit_areas_action.triggered.connect(self.onShowEditAreasChanged)
        self.show_edit_areas_action.setChecked(
            bool(self.settings.value('dev/show_edit_areas', '0')))

        self.__audio_thread_profiler = audio_thread_profiler.AudioThreadProfiler(
            context=self.context)
        self.profile_audio_thread_action = QtWidgets.QAction("Profile Audio Thread", self.qt_app)
        self.profile_audio_thread_action.triggered.connect(self.onProfileAudioThread)

        await self.createAudioProcProcess()

        self.default_style = self.qt_app.style().objectName()

        style_name = self.settings.value('appearance/qtStyle', '')
        if style_name:
            # TODO: something's wrong with the QtWidgets stubs...
            self.qt_app.setStyle(QtWidgets.QStyleFactory.create(style_name))  # type: ignore

        logger.info("Creating PipelinePerfMonitor.")
        self.pipeline_perf_monitor = pipeline_perf_monitor.PipelinePerfMonitor(context=self.context)

        logger.info("Creating StatMonitor.")
        self.stat_monitor = stat_monitor.StatMonitor(context=self.context)

        await self.createEditorWindow()

        if self.paths:
            logger.info("Starting with projects from cmdline.")
            for path in self.paths:
                if path.startswith('+'):
                    await self.createProject(path[1:])
                else:
                    await self.openProject(path)
        else:
            reopen_projects = self.settings.value('opened_projects', [])
            for path in reopen_projects or []:
                await self.openProject(path)

    async def cleanup(self) -> None:
        logger.info("Cleanup app...")

        if self.stat_monitor is not None:
            self.stat_monitor.storeState()
            self.stat_monitor = None

        if self.pipeline_perf_monitor is not None:
            self.pipeline_perf_monitor.storeState()
            self.pipeline_perf_monitor = None

        if self.__audio_thread_profiler is not None:
            self.__audio_thread_profiler.hide()
            self.__audio_thread_profiler = None

        if self.win is not None:
            self.win.storeState()
            await self.win.cleanup()
            self.win = None

        self.settings.sync()
        self.dumpSettings()

        if self.project_registry is not None:
            await self.project_registry.close_all()
            self.project_registry = None

        if self.audioproc_client is not None:
            await self.audioproc_client.disconnect(shutdown=True)
            await self.audioproc_client.cleanup()
            self.audioproc_client = None

        if self.urid_mapper is not None:
            await self.urid_mapper.cleanup(self.process.event_loop)
            self.urid_mapper = None

        if self.instrument_db is not None:
            await self.instrument_db.disconnect(shutdown=True)
            await self.instrument_db.cleanup()
            self.instrument_db = None

        if self.node_db is not None:
            await self.node_db.disconnect(shutdown=True)
            await self.node_db.cleanup()
            self.node_db = None

        if self.midi_hub is not None:
            self.midi_hub.stop()
            self.midi_hub = None

        if self.sequencer is not None:
            self.sequencer.close()
            self.sequencer = None

        logger.info("Remove custom excepthook.")
        sys.excepthook = self.__old_excepthook  # type: ignore

    def quit(self, exit_code: int = 0) -> None:
        # TODO: quit() is not a method of ProcessBase, only in UIProcess. Find some way to
        #   fix that without a cyclic import.
        self.process.quit(exit_code)  # type: ignore

    def createSequencer(self) -> devices.AlsaSequencer:
        # Do other clients handle non-ASCII names?
        # 'aconnect' seems to work (or just spits out whatever bytes it gets
        # and the console interprets it as UTF-8), 'aconnectgui' shows the
        # encoded bytes.
        return devices.AlsaSequencer('noisicaä')

    def createMidiHub(self) -> devices.MidiHub:
        return devices.MidiHub(self.sequencer)

    async def createAudioProcProcess(self) -> None:
        self.audioproc_process = await self.process.manager.call(
            'CREATE_AUDIOPROC_PROCESS', 'main',
            block_size=2 ** int(self.settings.value('audio/block_size', 10)),
            sample_rate=int(self.settings.value('audio/sample_rate', 44100)),
        )

        self.audioproc_client = AudioProcClient(
            self.process.event_loop, self.process.server)
        self.audioproc_client.engine_notifications.add(self.__handleEngineNotification)
        await self.audioproc_client.setup()
        await self.audioproc_client.connect(
            self.audioproc_process, {'perf_data'})

        await self.audioproc_client.create_realm(name='root')

        await self.audioproc_client.set_backend(
            self.settings.value('audio/backend', 'portaudio'),
        )

    async def createNodeDB(self) -> None:
        node_db_address = await self.process.manager.call('CREATE_NODE_DB_PROCESS')

        self.node_db = node_db.NodeDBClient(self.process.event_loop, self.process.server)
        await self.node_db.setup()
        await self.node_db.connect(node_db_address)

    async def createInstrumentDB(self) -> None:
        instrument_db_address = await self.process.manager.call(
            'CREATE_INSTRUMENT_DB_PROCESS')

        self.instrument_db = instrument_db.InstrumentDBClient(
            self.process.event_loop, self.process.server)
        await self.instrument_db.setup()
        await self.instrument_db.connect(instrument_db_address)

    async def createURIDMapper(self) -> None:
        urid_mapper_address = await self.process.manager.call('CREATE_URID_MAPPER_PROCESS')

        self.urid_mapper = lv2.ProxyURIDMapper(
            server_address=urid_mapper_address,
            tmp_dir=self.process.tmp_dir)
        await self.urid_mapper.setup(self.process.event_loop)

    async def createEditorWindow(self) -> None:
        logger.info("Creating EditorWindow.")
        self.win = EditorWindow(context=self.context)
        await self.win.setup()
        self.win.show()

    def dumpSettings(self) -> None:
        for key in self.settings.allKeys():
            value = self.settings.value(key)
            if isinstance(value, (bytes, QtCore.QByteArray)):
                value = '[%d bytes]' % len(value)
            logger.info('%s: %s', key, value)

    def onShowEditAreasChanged(self) -> None:
        self.settings.setValue(
            'dev/show_edit_areas', int(self.show_edit_areas_action.isChecked()))

    @property
    def showEditAreas(self) -> bool:
        return (self.runtime_settings.dev_mode
                and self.show_edit_areas_action.isChecked())

    def onProfileAudioThread(self) -> None:
        self.__audio_thread_profiler.show()
        self.__audio_thread_profiler.raise_()
        self.__audio_thread_profiler.activateWindow()

    def __handleEngineNotification(self, msg: audioproc.EngineNotification) -> None:
        for node_message_pb in msg.node_messages:
            msg_atom = node_message_pb.atom
            node_message = lv2.wrap_atom(self.urid_mapper, msg_atom).as_object
            self.node_messages.call(node_message_pb.node_id, node_message)

    # pylint: disable=line-too-long
    # def onPlayerStatus(self, player_state: audioproc.PlayerState):
    #     if pipeline_disabled:
    #         dialog = QtWidgets.QMessageBox(self)
    #         dialog.setIcon(QtWidgets.QMessageBox.Critical)
    #         dialog.setWindowTitle("noisicaa - Crash")
    #         dialog.setText(
    #             "The audio pipeline has been disabled, because it is repeatedly crashing.")
    #         quit_button = dialog.addButton("Quit", QtWidgets.QMessageBox.DestructiveRole)
    #         undo_and_restart_button = dialog.addButton(
    #             "Undo last command and restart pipeline", QtWidgets.QMessageBox.ActionRole)
    #         restart_button = dialog.addButton("Restart pipeline", QtWidgets.QMessageBox.AcceptRole)
    #         dialog.setDefaultButton(restart_button)
    #         dialog.finished.connect(lambda _: self.call_async(
    #             self.onPipelineDisabledDialogFinished(
    #                 dialog, quit_button, undo_and_restart_button, restart_button)))
    #         dialog.show()

    # async def onPipelineDisabledDialogFinished(
    #         self, dialog: QtWidgets.QMessageBox, quit_button: QtWidgets.QAbstractButton,
    #         undo_and_restart_button: QtWidgets.QAbstractButton,
    #         restart_button: QtWidgets.QAbstractButton) -> None:
    #     if dialog.clickedButton() == quit_button:
    #         self.app.quit()

    #     elif dialog.clickedButton() == restart_button:
    #         await self.project_client.restart_player_pipeline(self.__player_id)

    #     elif dialog.clickedButton() == undo_and_restart_button:
    #         await self.project_client.undo()
    #         await self.project_client.restart_player_pipeline(self.__player_id)
    # pylint: enable=line-too-long

    def setClipboardContent(self, content: Any) -> None:
        logger.info(
            "Setting clipboard contents to: %s", pprint.pformat(content))
        self.__clipboard = content

    def clipboardContent(self) -> Any:
        return self.__clipboard

    async def createProject(self, path: str) -> None:
        project_connection = self.project_registry.add_project(path)
        idx = self.win.addProjectSetupView(project_connection)
        await project_connection.create()
        await self.win.activateProjectView(idx, project_connection)
        self._updateOpenedProjects()

    async def openProject(self, path: str) -> None:
        project_connection = self.project_registry.add_project(path)
        idx = self.win.addProjectSetupView(project_connection)
        await project_connection.open()
        await self.win.activateProjectView(idx, project_connection)
        self._updateOpenedProjects()

    def _updateOpenedProjects(self) -> None:
        self.settings.setValue(
            'opened_projects',
            sorted(
                project.path
                for project in self.project_registry.projects.values()
                if project.path))

    async def removeProject(self, project_connection: project_registry.Project) -> None:
        await self.win.removeProjectView(project_connection)
        await self.project_registry.close_project(project_connection)
        self._updateOpenedProjects()

    def crashWithMessage(self, title: str, msg: str) -> None:
        logger.error('%s: %s', title, msg)

        try:
            errorbox = QtWidgets.QMessageBox()
            errorbox.setWindowTitle("noisicaä crashed")
            errorbox.setText(title)
            errorbox.setInformativeText(msg)
            errorbox.setIcon(QtWidgets.QMessageBox.Critical)
            errorbox.addButton("Exit", QtWidgets.QMessageBox.AcceptRole)
            errorbox.exec_()
        except:  # pylint: disable=bare-except
            logger.error(
                "Failed to show crash dialog: %s", traceback.format_exc())

        sys.stdout.flush()
        sys.stderr.flush()
        os._exit(EXIT_EXCEPTION)