Carla/source/frontend/carla_backend_qtweb.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Carla Backend code (Web stuff)
# Copyright (C) 2018 Filipe Coelho <falktx@falktx.com>
#
# 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 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.
#
# For a full copy of the GNU General Public License see the doc/GPL.txt file.

# ---------------------------------------------------------------------------------------------------------------------
# Imports (Global)

import requests

# ---------------------------------------------------------------------------------------------------------------------
# Imports (Custom)

from carla_backend_qt import *

import os
from time import sleep

# ---------------------------------------------------------------------------------------------------------------------
# Iterates over the content of a file-like object line-by-line.
# Based on code by Lars Kellogg-Stedman, see https://github.com/requests/requests/issues/2433

def iterate_stream_nonblock(stream, chunk_size=1024):
    pending = None

    while True:
        try:
            chunk = os.read(stream.raw.fileno(), chunk_size)
        except BlockingIOError:
            break
        if not chunk:
            break

        if pending is not None:
            chunk = pending + chunk
            pending = None

        lines = chunk.splitlines()

        if lines and lines[-1]:
            pending = lines.pop()

        for line in lines:
            yield line

        if not pending:
            break

    if pending:
        yield pending

# ---------------------------------------------------------------------------------------------------------------------

def create_stream(baseurl):
    stream = requests.get("{}/stream".format(baseurl), stream=True, timeout=0.1)

    if stream.encoding is None:
        stream.encoding = 'utf-8'

    return stream

# ---------------------------------------------------------------------------------------------------------------------
# Carla Host object for connecting to the REST API backend

class CarlaHostQtWeb(CarlaHostQtNull):
    def __init__(self):
        CarlaHostQtNull.__init__(self)

        self.baseurl = "http://localhost:2228"
        self.stream  = create_stream(self.baseurl)

        self.isRemote = True

    def get_engine_driver_count(self):
        # FIXME
        return int(requests.get("{}/get_engine_driver_count".format(self.baseurl)).text) - 1

    def get_engine_driver_name(self, index):
        return requests.get("{}/get_engine_driver_name".format(self.baseurl), params={
            'index': index,
        }).text

    def get_engine_driver_device_names(self, index):
        return requests.get("{}/get_engine_driver_device_names".format(self.baseurl), params={
            'index': index,
        }).text.split("\n")

    def get_engine_driver_device_info(self, index, name):
        return requests.get("{}/get_engine_driver_device_info".format(self.baseurl), params={
            'index': index,
            'name': name,
        }).json()

    def engine_init(self, driverName, clientName):
        return bool(int(requests.get("{}/engine_init".format(self.baseurl), params={
            'driverName': driverName,
            'clientName': clientName,
        }).text))

    def engine_close(self):
        return bool(int(requests.get("{}/engine_close".format(self.baseurl)).text))

    def engine_idle(self):
        closed = False
        stream = self.stream

        for line in iterate_stream_nonblock(stream):
            line = line.decode('utf-8', errors='ignore')

            if line.startswith("Carla: "):
                if self.fEngineCallback is None:
                    continue

                # split values from line
                action, pluginId, value1, value2, value3, valueStr = line[7:].split(" ",5)

                # convert to proper types
                action   = int(action)
                pluginId = int(pluginId)
                value1   = int(value1)
                value2   = int(value2)
                value3   = float(value3)

                # pass to callback
                self.fEngineCallback(None, action, pluginId, value1, value2, value3, valueStr)

            elif line == "Connection: close":
                if not closed:
                    self.stream = create_stream(self.baseurl)
                    closed = True

        if closed:
            stream.close()

    def is_engine_running(self):
        try:
            return bool(int(requests.get("{}/is_engine_running".format(self.baseurl)).text))
        except requests.exceptions.ConnectionError:
            if self.fEngineCallback is None:
                self.fEngineCallback(None, ENGINE_CALLBACK_QUIT, 0, 0, 0, 0.0, "")

    def set_engine_about_to_close(self):
        return bool(int(requests.get("{}/set_engine_about_to_close".format(self.baseurl)).text))

    def set_engine_option(self, option, value, valueStr):
        requests.get("{}/set_engine_option".format(self.baseurl), params={
            'option': option,
            'value': value,
            'valueStr': valueStr,
        })

    def load_file(self, filename):
        return bool(int(requests.get("{}/load_file".format(self.baseurl), params={
            'filename': filename,
        }).text))

    def load_project(self, filename):
        return bool(int(requests.get("{}/load_project".format(self.baseurl), params={
            'filename': filename,
        }).text))

    def save_project(self, filename):
        return bool(int(requests.get("{}/save_project".format(self.baseurl), params={
            'filename': filename,
        }).text))

    def patchbay_connect(self, groupIdA, portIdA, groupIdB, portIdB):
        return bool(int(requests.get("{}/patchbay_connect".format(self.baseurl), params={
            'groupIdA': groupIdA,
            'portIdA': portIdA,
            'groupIdB': groupIdB,
            'portIdB': portIdB,
        }).text))

    def patchbay_disconnect(self, connectionId):
        return bool(int(requests.get("{}/patchbay_disconnect".format(self.baseurl), params={
            'connectionId': connectionId,
        }).text))

    def patchbay_refresh(self, external):
        return bool(int(requests.get("{}/patchbay_refresh".format(self.baseurl), params={
            'external': external,
        }).text))

    def transport_play(self):
        requests.get("{}/transport_play".format(self.baseurl))

    def transport_pause(self):
        requests.get("{}/transport_pause".format(self.baseurl))

    def transport_bpm(self, bpm):
        requests.get("{}/transport_bpm".format(self.baseurl), params={
            'bpm': bpm,
        })

    def transport_relocate(self, frame):
        requests.get("{}/transport_relocate".format(self.baseurl), params={
            'frame': frame,
        })

    def get_current_transport_frame(self):
        return int(requests.get("{}/get_current_transport_frame".format(self.baseurl)).text)

    def get_transport_info(self):
        return requests.get("{}/get_transport_info".format(self.baseurl)).json()

    def get_current_plugin_count(self):
        return int(requests.get("{}/get_current_plugin_count".format(self.baseurl)).text)

    def get_max_plugin_number(self):
        return int(requests.get("{}/get_max_plugin_number".format(self.baseurl)).text)

    def add_plugin(self, btype, ptype, filename, name, label, uniqueId, extraPtr, options):
        return bool(int(requests.get("{}/add_plugin".format(self.baseurl), params={
            'btype': btype,
            'ptype': ptype,
            'filename': filename,
            'name': name,
            'label': label,
            'uniqueId': uniqueId,
            'options': options,
        }).text))

    def remove_plugin(self, pluginId):
        return bool(int(requests.get("{}/remove_plugin".format(self.baseurl), params={
            'filename': pluginId,
        }).text))

    def remove_all_plugins(self):
        return bool(int(requests.get("{}/remove_all_plugins".format(self.baseurl)).text))

    def rename_plugin(self, pluginId, newName):
        return requests.get("{}/rename_plugin".format(self.baseurl), params={
            'pluginId': pluginId,
            'newName': newName,
        }).text

    def clone_plugin(self, pluginId):
        return bool(int(requests.get("{}/clone_plugin".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text))

    def replace_plugin(self, pluginId):
        return bool(int(requests.get("{}/replace_plugin".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text))

    def switch_plugins(self, pluginIdA, pluginIdB):
        return bool(int(requests.get("{}/switch_plugins".format(self.baseurl), params={
            'pluginIdA': pluginIdA,
            'pluginIdB': pluginIdB,
        }).text))

    def load_plugin_state(self, pluginId, filename):
        return bool(int(requests.get("{}/load_plugin_state".format(self.baseurl), params={
            'pluginId': pluginId,
            'filename': filename,
        }).text))

    def save_plugin_state(self, pluginId, filename):
        return bool(int(requests.get("{}/save_plugin_state".format(self.baseurl), params={
            'pluginId': pluginId,
            'filename': filename,
        }).text))

    def export_plugin_lv2(self, pluginId, lv2path):
        return bool(int(requests.get("{}/export_plugin_lv2".format(self.baseurl), params={
            'pluginId': pluginId,
            'lv2path': lv2path,
        }).text))

    def get_plugin_info(self, pluginId):
        return requests.get("{}/get_plugin_info".format(self.baseurl), params={
            'pluginId': pluginId,
        }).json()

    def get_audio_port_count_info(self, pluginId):
        return requests.get("{}/get_audio_port_count_info".format(self.baseurl), params={
            'pluginId': pluginId,
        }).json()

    def get_midi_port_count_info(self, pluginId):
        return requests.get("{}/get_midi_port_count_info".format(self.baseurl), params={
            'pluginId': pluginId,
        }).json()

    def get_parameter_count_info(self, pluginId):
        return requests.get("{}/get_parameter_count_info".format(self.baseurl), params={
            'pluginId': pluginId,
        }).json()

    def get_parameter_info(self, pluginId, parameterId):
        return requests.get("{}/get_parameter_info".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).json()

    def get_parameter_scalepoint_info(self, pluginId, parameterId, scalePointId):
        return requests.get("{}/get_parameter_scalepoint_info".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
            'scalePointId': scalePointId,
        }).json()

    def get_parameter_data(self, pluginId, parameterId):
        return requests.get("{}/get_parameter_data".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).json()

    def get_parameter_ranges(self, pluginId, parameterId):
        return requests.get("{}/get_parameter_ranges".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).json()

    def get_midi_program_data(self, pluginId, midiProgramId):
        return requests.get("{}/get_midi_program_data".format(self.baseurl), params={
            'pluginId': pluginId,
            'midiProgramId': midiProgramId,
        }).json()

    def get_custom_data(self, pluginId, customDataId):
        return requests.get("{}/get_custom_data".format(self.baseurl), params={
            'pluginId': pluginId,
            'customDataId': customDataId,
        }).json()

    def get_custom_data_value(self, pluginId, type_, key):
        return requests.get("{}/get_custom_data_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'type_': type_,
            'key': key,
        }).text

    def get_chunk_data(self, pluginId):
        return requests.get("{}/get_chunk_data".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text

    def get_parameter_count(self, pluginId):
        return int(requests.get("{}/get_parameter_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_program_count(self, pluginId):
        return int(requests.get("{}/get_program_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_midi_program_count(self, pluginId):
        return int(requests.get("{}/get_midi_program_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_custom_data_count(self, pluginId):
        return int(requests.get("{}/get_custom_data_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_parameter_text(self, pluginId, parameterId):
        return requests.get("{}/get_parameter_text".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).text

    def get_program_name(self, pluginId, programId):
        return requests.get("{}/get_program_name".format(self.baseurl), params={
            'pluginId': pluginId,
            'programId': programId,
        }).text

    def get_midi_program_name(self, pluginId, midiProgramId):
        return requests.get("{}/get_midi_program_name".format(self.baseurl), params={
            'pluginId': pluginId,
            'midiProgramId': midiProgramId,
        }).text

    def get_real_plugin_name(self, pluginId):
        return requests.get("{}/get_real_plugin_name".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text

    def get_current_program_index(self, pluginId):
        return int(requests.get("{}/get_custom_data_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_current_midi_program_index(self, pluginId):
        return int(requests.get("{}/get_custom_data_count".format(self.baseurl), params={
            'pluginId': pluginId,
        }).text)

    def get_default_parameter_value(self, pluginId, parameterId):
        return float(requests.get("{}/get_default_parameter_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).text)

    def get_current_parameter_value(self, pluginId, parameterId):
        return float(requests.get("{}/get_current_parameter_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).text)

    def get_internal_parameter_value(self, pluginId, parameterId):
        return float(requests.get("{}/get_internal_parameter_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
        }).text)

    def get_input_peak_value(self, pluginId, isLeft):
        return float(requests.get("{}/get_input_peak_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'isLeft': isLeft,
        }).text)

    def get_output_peak_value(self, pluginId, isLeft):
        return float(requests.get("{}/get_output_peak_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'isLeft': isLeft,
        }).text)

    def set_option(self, pluginId, option, yesNo):
        requests.get("{}/set_option".format(self.baseurl), params={
            'pluginId': pluginId,
            'option': option,
            'yesNo': yesNo,
        })

    def set_active(self, pluginId, onOff):
        requests.get("{}/set_active".format(self.baseurl), params={
            'pluginId': pluginId,
            'onOff': onOff,
        })

    def set_drywet(self, pluginId, value):
        requests.get("{}/set_drywet".format(self.baseurl), params={
            'pluginId': pluginId,
            'value': value,
        })

    def set_volume(self, pluginId, value):
        requests.get("{}/set_volume".format(self.baseurl), params={
            'pluginId': pluginId,
            'value': value,
        })

    def set_balance_left(self, pluginId, value):
        requests.get("{}/set_balance_left".format(self.baseurl), params={
            'pluginId': pluginId,
            'value': value,
        })

    def set_balance_right(self, pluginId, value):
        requests.get("{}/set_balance_right".format(self.baseurl), params={
            'pluginId': pluginId,
            'value': value,
        })

    def set_panning(self, pluginId, value):
        requests.get("{}/set_panning".format(self.baseurl), params={
            'pluginId': pluginId,
            'value': value,
        })

    def set_ctrl_channel(self, pluginId, channel):
        requests.get("{}/set_ctrl_channel".format(self.baseurl), params={
            'pluginId': pluginId,
            'channel': channel,
        })

    def set_parameter_value(self, pluginId, parameterId, value):
        requests.get("{}/set_parameter_value".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
            'value': value,
        })

    def set_parameter_midi_channel(self, pluginId, parameterId, channel):
        requests.get("{}/set_parameter_midi_channel".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
            'channel': channel,
        })

    def set_parameter_midi_cc(self, pluginId, parameterId, cc):
        requests.get("{}/set_parameter_midi_cc".format(self.baseurl), params={
            'pluginId': pluginId,
            'parameterId': parameterId,
            'cc': cc,
        })

    def set_program(self, pluginId, programId):
        requests.get("{}/set_program".format(self.baseurl), params={
            'pluginId': pluginId,
        })

    def set_midi_program(self, pluginId, midiProgramId):
        requests.get("{}/set_midi_program".format(self.baseurl), params={
            'pluginId': pluginId,
            'midiProgramId': midiProgramId,
        })

    def set_custom_data(self, pluginId, type_, key, value):
        requests.get("{}/set_custom_data".format(self.baseurl), params={
            'pluginId': pluginId,
            'type': type_,
            'key': key,
            'value': value,
        })

    def set_chunk_data(self, pluginId, chunkData):
        requests.get("{}/set_chunk_data".format(self.baseurl), params={
            'pluginId': pluginId,
            'chunkData': chunkData,
        })

    def prepare_for_save(self, pluginId):
        requests.get("{}/prepare_for_save".format(self.baseurl), params={
            'pluginId': pluginId,
        })

    def reset_parameters(self, pluginId):
        requests.get("{}/reset_parameters".format(self.baseurl), params={
            'pluginId': pluginId,
        })

    def randomize_parameters(self, pluginId):
        requests.get("{}/randomize_parameters".format(self.baseurl), params={
            'pluginId': pluginId,
        })

    def send_midi_note(self, pluginId, channel, note, velocity):
        requests.get("{}/send_midi_note".format(self.baseurl), params={
            'pluginId': pluginId,
            'channel': channel,
            'note': note,
            'velocity': velocity,
        })

    def get_buffer_size(self):
        return int(requests.get("{}/get_buffer_size".format(self.baseurl)).text)

    def get_sample_rate(self):
        return float(requests.get("{}/get_sample_rate".format(self.baseurl)).text)

    def get_last_error(self):
        return requests.get("{}/get_last_error".format(self.baseurl)).text

    def get_host_osc_url_tcp(self):
        return requests.get("{}/get_host_osc_url_tcp".format(self.baseurl)).text

    def get_host_osc_url_udp(self):
        return requests.get("{}/get_host_osc_url_udp".format(self.baseurl)).text