Refactor brightness to use web-greeter's controller

web-greeter/bridge/Greeter.py

@@ -42,6 +42,7 @@ from PyQt5.QtCore import QFileSystemWatcher, QVariant, QTimer
 from config import web_greeter_config
 from utils.battery import Battery
 from utils.screensaver import reset_screensaver
+from utils.brightness import BrightnessController
 import globals
 
 # This Application
@@ -59,54 +60,6 @@ from . import (
 LightDMGreeter = LightDM.Greeter()
 LightDMUsers = LightDM.UserList()
 
-
-def changeBrightness(method: str, quantity: int = None):
-    backlight = web_greeter_config["config"]["features"]["backlight"]
-    if not backlight["enabled"]:
-        return
-    if not quantity:
-        quantity = backlight["value"]
-    try:
-        steps = backlight["steps"]
-        child = subprocess.run(["xbacklight", method, str(quantity), "-steps", str(steps)])
-        if child.returncode == 1:
-            raise ChildProcessError("xbacklight returned 1")
-    except Exception as err:
-        logger.error("Brightness: {}".format(err))
-    else:
-        if globals.greeter:
-            globals.greeter.greeter.brightness_update.emit()
-
-def increaseBrightness(quantity: int = None):
-    backlight = web_greeter_config["config"]["features"]["backlight"]
-    if not backlight["enabled"]:
-        return
-    if not quantity:
-        quantity = backlight["value"]
-    thread = threading.Thread(target=changeBrightness,
-                              args=("-inc", quantity))
-    thread.start()
-
-def decreaseBrightness(quantity: int = None):
-    backlight = web_greeter_config["config"]["features"]["backlight"]
-    if not backlight["enabled"]:
-        return
-    if not quantity:
-        quantity = backlight["value"]
-    thread = threading.Thread(target=changeBrightness,
-                              args=("-dec", quantity))
-    thread.start()
-
-def setBrightness(quantity: int = None):
-    backlight = web_greeter_config["config"]["features"]["backlight"]
-    if not backlight["enabled"]:
-        return
-    if not quantity:
-        quantity = backlight["value"]
-    thread = threading.Thread(target=changeBrightness,
-                              args=("-set", quantity))
-    thread.start()
-
 def getBrightness(self):
     if self._config["features"]["backlight"]["enabled"] != True:
         return -1
@@ -146,6 +99,8 @@ class Greeter(BridgeObject):
         if self._config["features"]["battery"]:
             self._battery = Battery()
 
+        self._brightness_controller = BrightnessController()
+
         try:
             LightDMGreeter.connect_to_daemon_sync()
         except Exception as err:
@@ -220,11 +175,11 @@ class Greeter(BridgeObject):
 
     @Bridge.prop(int, notify=brightness_update)
     def brightness(self):
-        return getBrightness(self)
+        return self._brightness_controller.brightness
 
     @brightness.setter
     def brightness(self, quantity):
-        setBrightness(quantity)
+        self._brightness_controller.brightness = quantity
 
     @Bridge.prop(bool, notify=noop_signal)
     def can_hibernate(self):
@@ -353,15 +308,15 @@ class Greeter(BridgeObject):
 
     @Bridge.method(int)
     def brightnessSet(self, quantity):
-        setBrightness(quantity)
+        self._brightness_controller.set_brightness(quantity)
 
     @Bridge.method(int)
     def brightnessIncrease(self, quantity):
-        increaseBrightness(quantity)
+        self._brightness_controller.inc_brightness(quantity)
 
     @Bridge.method(int)
     def brightnessDecrease(self, quantity):
-        decreaseBrightness(quantity)
+        self._brightness_controller.dec_brightness(quantity)
 
     @Bridge.method()
     def cancel_authentication(self):

web-greeter/bridge/__init__.py

@@ -50,22 +50,6 @@ stream_handler.setFormatter(formatter)
 logger.setLevel(DEBUG)
 logger.addHandler(stream_handler)
 
-
-class setInterval:
-    def __init__(self, interval, action):
-        self.interval = interval
-        self.action = action
-        self.stopEvent = threading.Event()
-        thread = threading.Thread(target=self.__setInterval)
-        thread.start()
-
-    def __setInterval(self):
-        nextTime = time.time() + self.interval
-        while not self.stopEvent.wait(nextTime - time.time()):
-            nextTime += self.interval
-            self.action()
-
-
 def language_to_dict(lang):
     if (not lang):
         return dict()

web-greeter/browser/window.py

@@ -25,7 +25,6 @@
 #  You should have received a copy of the GNU General Public License
 #  along with Web Greeter; If not, see <http://www.gnu.org/licenses/>.
 
-from bridge.Greeter import changeBrightness, decreaseBrightness, increaseBrightness
 from PyQt5.QtCore import QFileSystemWatcher, Qt
 from PyQt5.QtWidgets import QAction, QMainWindow
 from PyQt5.QtGui import QKeyEvent
@@ -37,7 +36,6 @@ class MainWindow(QMainWindow):
     def __init__(self):
         super().__init__()
         self.init_actions()
-        # self.watchBrightness()
 
     def init_actions(self):
         devAct = QAction(text="&Toggle Devtools", parent=self)
@@ -59,14 +57,13 @@ class MainWindow(QMainWindow):
         globals.greeter.toggle_devtools()
 
     def inc_brightness(self):
-        increaseBrightness()
+        if globals.greeter:
+            value = web_greeter_config["config"]["features"]["backlight"]["value"]
+            globals.greeter.greeter.inc_brightness(value)
     def dec_brightness(self):
-        decreaseBrightness()
-
-    def watchBrightness(self):
-        self.watcher = QFileSystemWatcher(parent=self)
-        self.watcher.addPath("/sys/class/backlight/intel_backlight/brightness")
-        self.watcher.fileChanged.connect(self.updateBrightness)
+        if globals.greeter:
+            value = web_greeter_config["config"]["features"]["backlight"]["value"]
+            globals.greeter.greeter.dec_brightness(value)
 
     def updateBrightness(self):
         if globals.greeter:

web-greeter/utils/battery.py

@@ -23,7 +23,7 @@ class Battery:
     callbacks = []
 
     def __init__(self):
-        if self._batteries.__len__() == 0:
+        if len(self._batteries) == 0:
             scandir_line(self.pspath, self._update_batteries)
         start_timer(self.full_update, self.onerror)
         self.full_update()
@@ -53,8 +53,8 @@ class Battery:
             self.ac = match.group() if match else self.ac
 
     # Based on "bat" widget from "lain" awesome-wm library
-	# * (c) 2013,      Luca CPZ
-	# * (c) 2010-2012, Peter Hofmann
+    # * (c) 2013,      Luca CPZ
+    # * (c) 2010-2012, Peter Hofmann
     # @see https://github.com/lcpz/lain/blob/master/widget/bat.lua
     def full_update(self):
         global running

web-greeter/utils/brightness.py

@@ -0,0 +1,165 @@
+# -*- coding: utf-8 -*-
+#
+#  brightness.py
+#
+#  Copyright © 2021 JezerM
+#
+#  This file is part of Web Greeter.
+#
+#  Web Greeter 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.
+#
+#  Web Greeter 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.
+#
+#  The following additional terms are in effect as per Section 7 of the license:
+#
+#  The preservation of all legal notices and author attributions in
+#  the material or in the Appropriate Legal Notices displayed
+#  by works containing it is required.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with Web Greeter; If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import stat
+import time
+import pyinotify
+from typing import List
+from threading import Thread
+import globals
+from logger import logger
+from config import web_greeter_config
+
+sys_path = ["/sys/class/backlight/"]
+
+def get_controllers() -> List[str]:
+    ctrls: List[str] = []
+    for dev in sys_path:
+        if os.path.exists(dev) and stat.S_ISDIR(os.stat(dev).st_mode):
+            drs = os.listdir(dev)
+            for name in drs:
+                ctrls.append(os.path.join(dev, name))
+    return ctrls
+
+class EventHandler(pyinotify.ProcessEvent):
+    def process_IN_MODIFY(self, event):
+        if globals.greeter:
+            globals.greeter.greeter.brightness_update.emit()
+
+
+# Behavior based on "acpilight"
+# Copyright(c) 2016-2019 by wave++ "Yuri D'Elia" <wavexx@thregr.org>
+# See https://gitlab.com/wavexx/acpilight
+class BrightnessController:
+
+    _controllers: List[str] = []
+    _available: bool = False
+    _brightness_path: str
+    _max_brightness_path: str
+    steps: int
+    delay: int
+    _brightness: int
+    _max_brightness: int = -1
+
+    def __init__(self):
+        self._controllers = get_controllers()
+        if (len(self._controllers) == 0 or
+            self._controllers[0] == None or
+            web_greeter_config["config"]["features"]["backlight"]["enabled"] == False):
+            self._available = False
+            return
+        b_path = self._controllers[0]
+        self._available = True
+        self._brightness_path = os.path.join(b_path, "brightness")
+        self._max_brightness_path = os.path.join(b_path, "max_brightness")
+
+        with open(self._max_brightness_path, "r") as f:
+            self._max_brightness = int(f.read())
+
+        steps = web_greeter_config["config"]["features"]["backlight"]["steps"]
+        self.steps = 1 if steps <= 1 else steps
+        self.delay = 200
+        self.watch_brightness()
+
+    def _watch(self):
+        wm = pyinotify.WatchManager()
+        handler = EventHandler()
+        wm.add_watch(self._brightness_path, pyinotify.IN_MODIFY)
+
+        notifier = pyinotify.Notifier(wm, handler)
+
+        notifier.loop()
+
+    def watch_brightness(self):
+        if not self._available:
+            return
+        thread = Thread(target = self._watch)
+        thread.daemon = True
+        thread.start()
+
+    @property
+    def max_brightness(self) -> int:
+        return self._max_brightness
+
+    @property
+    def real_brightness(self) -> int:
+        if not self._available: return -1
+        try:
+            with open(self._brightness_path, "r") as f:
+                return int(f.read())
+        except OSError:
+            logger.error("Couldn't read from \"" + self._brightness_path + "\"")
+            return -1
+
+    @real_brightness.setter
+    def real_brightness(self, v: int):
+        if not self._available: return
+        if v > self.max_brightness: v = self.max_brightness
+        elif v <= 0: v = 0
+
+        if not os.path.exists(self._brightness_path): return
+
+        try:
+            with open(self._brightness_path, "w") as f:
+                f.write(str(round(v)))
+        except OSError:
+            logger.error("Couldn't write to \"" + self._brightness_path + "\"")
+
+    @property
+    def brightness(self) -> int:
+        if not self._available: return -1
+        return round(self.real_brightness * 100 / self.max_brightness)
+
+    @brightness.setter
+    def brightness(self, v: int):
+        self.real_brightness = round(v * self.max_brightness / 100)
+
+    def _set_brightness(self, value: int):
+        if not self._available: return
+        steps = self.steps or 1
+        sleep = self.delay / steps
+        current = self.brightness
+
+        if steps <= 1:
+            self.brightness = value
+            return
+
+        for i in range(steps + 1):
+            time.sleep(sleep / 1000)
+            brigh = current + ((value - current) * i) / steps
+            self.brightness = round(brigh)
+
+    def set_brightness(self, value: int):
+        thread = Thread(target = self._set_brightness, args = (value,))
+        thread.start()
+
+    def inc_brightness(self, value: int):
+        self.set_brightness(self.brightness + value)
+
+    def dec_brightness(self, value: int):
+        self.set_brightness(self.brightness - value)