#!python3
# -*- coding: utf-8 -*-
"""
Main class for inkycal Project
Copyright by aceinnolab
"""
import glob
import hashlib
import json
import traceback
from logging.handlers import RotatingFileHandler
import arrow
import numpy
from inkycal.custom import *
from inkycal.display import Display
from inkycal.modules.inky_image import Inkyimage as Images
from PIL import Image
# On the console, set a logger to show only important logs
# (level ERROR or higher)
stream_handler = logging.StreamHandler()
stream_handler.setLevel(logging.ERROR)
if not os.path.exists(f'{top_level}/logs'):
os.mkdir(f'{top_level}/logs')
# Save all logs to a file, which contains more detailed output
logging.basicConfig(
level=logging.INFO,
format='%(asctime)s | %(name)s | %(levelname)s: %(message)s',
datefmt='%d-%m-%Y %H:%M:%S',
handlers=[
stream_handler, # add stream handler from above
RotatingFileHandler( # log to a file too
f'{top_level}/logs/inkycal.log', # file to log
maxBytes=2097152, # 2MB max filesize
backupCount=5 # create max 5 log files
)
]
)
# Show less logging for PIL module
logging.getLogger("PIL").setLevel(logging.WARNING)
logger = logging.getLogger(__name__)
# TODO: autostart -> supervisor?
class Inkycal:
"""Inkycal main class
Main class of Inkycal, test and run the main Inkycal program.
Args:
- settings_path = str -> the full path to your settings.json file
if no path is given, tries looking for settings file in /boot folder.
- render = bool (True/False) -> show the image on the epaper display?
Attributes:
- optimize = True/False. Reduce number of colours on the generated image
to improve rendering on E-Papers. Set this to False for 9.7" E-Paper.
"""
def __init__(self, settings_path=None, render=True):
"""Initialise Inkycal"""
self._release = '2.0.2'
# Check if render was set correctly
if render not in [True, False]:
raise Exception(f'render must be True or False, not "{render}"')
self.render = render
# load settings file - throw an error if file could not be found
if settings_path:
try:
with open(settings_path) as settings_file:
settings = json.load(settings_file)
self.settings = settings
except FileNotFoundError:
raise SettingsFileNotFoundError
else:
try:
with open('/boot/settings.json') as settings_file:
settings = json.load(settings_file)
self.settings = settings
except FileNotFoundError:
raise SettingsFileNotFoundError
if not os.path.exists(image_folder):
os.mkdir(image_folder)
# Option to use epaper image optimisation, reduces colours
self.optimize = True
# Load drivers if image should be rendered
if self.render:
# Init Display class with model in settings file
# from inkycal.display import Display
self.Display = Display(settings["model"])
# check if colours can be rendered
self.supports_colour = True if 'colour' in settings['model'] else False
# get calibration hours
self._calibration_hours = self.settings['calibration_hours']
# init calibration state
self._calibration_state = False
# Load and intialize modules specified in the settings file
self._module_number = 1
for module in settings['modules']:
module_name = module['name']
try:
loader = f'from inkycal.modules import {module_name}'
# print(loader)
exec(loader)
setup = f'self.module_{self._module_number} = {module_name}({module})'
# print(setup)
exec(setup)
logger.info(('name : {name} size : {width}x{height} px'.format(
name=module_name,
width=module['config']['size'][0],
height=module['config']['size'][1])))
self._module_number += 1
# If a module was not found, print an error message
except ImportError:
print(f'Could not find module: "{module}". Please try to import manually')
# If something unexpected happened, show the error message
except Exception as e:
print(str(e))
# Path to store images
self.image_folder = image_folder
# Remove old hashes
self._remove_hashes(self.image_folder)
# Give an OK message
print('loaded inkycal')
def countdown(self, interval_mins=None):
"""Returns the remaining time in seconds until next display update"""
# Check if empty, if empty, use value from settings file
if interval_mins is None:
interval_mins = self.settings["update_interval"]
# Find out at which minutes the update should happen
now = arrow.now()
update_timings = [(60 - int(interval_mins) * updates) for updates in
range(60 // int(interval_mins))][::-1]
# Calculate time in mins until next update
minutes = [_ for _ in update_timings if _ >= now.minute][0] - now.minute
# Print the remaining time in mins until next update
print(f'{minutes} minutes left until next refresh')
# Calculate time in seconds until next update
remaining_time = minutes * 60 + (60 - now.second)
# Return seconds until next update
return remaining_time
def test(self):
"""Tests if Inkycal can run without issues.
Attempts to import module names from settings file. Loads the config
for each module and initializes the module. Tries to run the module and
checks if the images could be generated correctly.
Generated images can be found in the /images folder of Inkycal.
"""
print(f'Inkycal version: v{self._release}')
print(f'Selected E-paper display: {self.settings["model"]}')
# store module numbers in here
errors = []
# short info for info-section
self.info = f"{arrow.now().format('D MMM @ HH:mm')} "
for number in range(1, self._module_number):
name = eval(f"self.module_{number}.name")
module = eval(f'self.module_{number}')
print(f'generating image(s) for {name}...', end="")
try:
black, colour = module.generate_image()
black.save(f"{self.image_folder}module{number}_black.png", "PNG")
colour.save(f"{self.image_folder}module{number}_colour.png", "PNG")
print('OK!')
except:
errors.append(number)
self.info += f"module {number}: Error! "
print('Error!')
print(traceback.format_exc())
if errors:
print('Error/s in modules:', *errors)
del errors
self._assemble()
def _image_hash(self, _in):
"""Create a md5sum of a path or a bytes stream."""
if not isinstance(_in, str):
image_bytes = _in.tobytes()
else:
try:
with open(_in) as i:
return i.read()
except FileNotFoundError:
image_bytes = None
return hashlib.md5(image_bytes).hexdigest() if image_bytes else ""
def _remove_hashes(self, basepath):
for _file in glob.glob(f"{basepath}/*.hash"):
try:
os.remove(_file)
except:
pass
def _write_image_hash(self, path, _in):
"""Write hash to a file."""
with open(path, "w") as o:
o.write(self._image_hash(_in))
def _needs_image_update(self, _list):
"""Check if any image has been updated or not.
Input a list of tuples(str, image)."""
res = False
for item in _list:
_a = self._image_hash(item[0])
_b = self._image_hash(item[1])
print("{f1}:{h1} -> {h2}".format(f1=item[0], h1=_a, h2=_b))
if _a != _b:
res = True
self._write_image_hash(item[0], item[1])
print("Refresh needed: {a}".format(a=res))
return res
def run(self):
"""Runs main program in nonstop mode.
Uses an infinity loop to run Inkycal nonstop. Inkycal generates the image
from all modules, assembles them in one image, refreshed the E-Paper and
then sleeps until the next sheduled update.
"""
# Get the time of initial run
runtime = arrow.now()
# Function to flip images upside down
upside_down = lambda image: image.rotate(180, expand=True)
# Count the number of times without any errors
counter = 0
print(f'Inkycal version: v{self._release}')
print(f'Selected E-paper display: {self.settings["model"]}')
while True:
current_time = arrow.now(tz=get_system_tz())
print(f"Date: {current_time.format('D MMM YY')} | "
f"Time: {current_time.format('HH:mm')}")
print('Generating images for all modules...', end='')
errors = [] # store module numbers in here
# short info for info-section
if not self.settings.get('image_hash', False):
self.info = f"{current_time.format('D MMM @ HH:mm')} "
else:
self.info = ""
for number in range(1, self._module_number):
# name = eval(f"self.module_{number}.name")
module = eval(f'self.module_{number}')
try:
black, colour = module.generate_image()
black.save(f"{self.image_folder}module{number}_black.png", "PNG")
colour.save(f"{self.image_folder}module{number}_colour.png", "PNG")
self.info += f"module {number}: OK "
except:
errors.append(number)
print('error!')
print(traceback.format_exc())
self.info += f"module {number}: error! "
logger.exception(f'Exception in module {number}')
if errors:
print('error/s in modules:', *errors)
counter = 0
else:
counter += 1
print('successful')
del errors
# Assemble image from each module - add info section if specified
self._assemble()
# Check if image should be rendered
if self.render:
display = self.Display
self._calibration_check()
if self._calibration_state:
# after calibration we have to forcefully rewrite the screen
self._remove_hashes(self.image_folder)
if self.supports_colour:
im_black = Image.open(f"{self.image_folder}canvas.png")
im_colour = Image.open(f"{self.image_folder}canvas_colour.png")
# Flip the image by 180° if required
if self.settings['orientation'] == 180:
im_black = upside_down(im_black)
im_colour = upside_down(im_colour)
# render the image on the display
if not self.settings.get('image_hash', False) or self._needs_image_update([
(f"{self.image_folder}/canvas.png.hash", im_black),
(f"{self.image_folder}/canvas_colour.png.hash", im_colour)
]):
# render the image on the display
display.render(im_black, im_colour)
# Part for black-white ePapers
elif not self.supports_colour:
im_black = self._merge_bands()
# Flip the image by 180° if required
if self.settings['orientation'] == 180:
im_black = upside_down(im_black)
if not self.settings.get('image_hash', False) or self._needs_image_update([
(f"{self.image_folder}/canvas.png.hash", im_black),
]):
display.render(im_black)
print(f'\nNo errors since {counter} display updates \n'
f'program started {runtime.humanize()}')
sleep_time = self.countdown()
time.sleep(sleep_time)
@staticmethod
def _merge_bands():
"""Merges black and coloured bands for black-white ePapers
returns the merged image
"""
im1_path, im2_path = image_folder + 'canvas.png', image_folder + 'canvas_colour.png'
# If there is an image for black and colour, merge them
if os.path.exists(im1_path) and os.path.exists(im2_path):
im1 = Image.open(im1_path).convert('RGBA')
im2 = Image.open(im2_path).convert('RGBA')
im1 = Images.merge(im1, im2)
# If there is no image for the coloured-band, return the bw-image
elif os.path.exists(im1_path) and not os.path.exists(im2_path):
im1 = Image.open(im1_path).convert('RGBA')
else:
raise FileNotFoundError("Inkycal cannot find images to merge")
return im1
def _assemble(self):
"""Assembles all sub-images to a single image"""
# Create 2 blank images with the same resolution as the display
width, height = Display.get_display_size(self.settings["model"])
# Since Inkycal runs in vertical mode, switch the height and width
width, height = height, width
im_black = Image.new('RGB', (width, height), color='white')
im_colour = Image.new('RGB', (width, height), color='white')
# Set cursor for y-axis
im1_cursor = 0
im2_cursor = 0
for number in range(1, self._module_number):
# get the path of the current module's generated images
im1_path = f"{self.image_folder}module{number}_black.png"
im2_path = f"{self.image_folder}module{number}_colour.png"
# Check if there is an image for the black band
if os.path.exists(im1_path):
# Get actual size of image
im1 = Image.open(im1_path).convert('RGBA')
im1_size = im1.size
# Get the size of the section
section_size = [i for i in self.settings['modules'] if i['position'] == number][0]['config']['size']
# Calculate coordinates to center the image
x = int((section_size[0] - im1_size[0]) / 2)
# If this is the first module, use the y-offset
if im1_cursor == 0:
y = int((section_size[1] - im1_size[1]) / 2)
else:
y = im1_cursor + int((section_size[1] - im1_size[1]) / 2)
# center the image in the section space
im_black.paste(im1, (x, y), im1)
# Shift the y-axis cursor at the beginning of next section
im1_cursor += section_size[1]
# Check if there is an image for the coloured band
if os.path.exists(im2_path):
# Get actual size of image
im2 = Image.open(im2_path).convert('RGBA')
im2_size = im2.size
# Get the size of the section
section_size = [i for i in self.settings['modules'] if i['position'] == number][0]['config']['size']
# Calculate coordinates to center the image
x = int((section_size[0] - im2_size[0]) / 2)
# If this is the first module, use the y-offset
if im2_cursor == 0:
y = int((section_size[1] - im2_size[1]) / 2)
else:
y = im2_cursor + int((section_size[1] - im2_size[1]) / 2)
# center the image in the section space
im_colour.paste(im2, (x, y), im2)
# Shift the y-axis cursor at the beginning of next section
im2_cursor += section_size[1]
# Add info-section if specified --
# Calculate the max. fontsize for info-section
if self.settings['info_section']:
info_height = self.settings["info_section_height"]
info_width = width
font = self.font = ImageFont.truetype(
fonts['NotoSansUI-Regular'], size=14)
info_x = im_black.size[1] - info_height
write(im_black, (0, info_x), (info_width, info_height),
self.info, font=font)
# optimize the image by mapping colours to pure black and white
if self.optimize:
im_black = self._optimize_im(im_black)
im_colour = self._optimize_im(im_colour)
im_black.save(self.image_folder + 'canvas.png', 'PNG')
im_colour.save(self.image_folder + 'canvas_colour.png', 'PNG')
# Additionally, combine the two images with color
def clear_white(img):
"""Replace all white pixels from image with transparent pixels
"""
x = numpy.asarray(img.convert('RGBA')).copy()
x[:, :, 3] = (255 * (x[:, :, :3] != 255).any(axis=2)).astype(numpy.uint8)
return Image.fromarray(x)
# Additionally, combine the two images with color
def black_to_colour(img):
"""Replace all black pixels from image with red pixels
"""
buffer = numpy.array(img.convert('RGB'))
red, green = buffer[:, :, 0], buffer[:, :, 1]
threshold = 220
# non-white -> red
buffer[numpy.logical_and(red <= threshold, green <= threshold)] = [255, 0, 0]
return Image.fromarray(buffer)
# Save full-screen images as well
im_black = clear_white(im_black)
im_colour = black_to_colour(im_colour)
im_colour.paste(im_black, (0, 0), im_black)
im_colour.save(image_folder + 'full-screen.png', 'PNG')
@staticmethod
def _optimize_im(image, threshold=220):
"""Optimize the image for rendering on ePaper displays"""
buffer = numpy.array(image.convert('RGB'))
red, green = buffer[:, :, 0], buffer[:, :, 1]
# grey->black
buffer[numpy.logical_and(red <= threshold, green <= threshold)] = [0, 0, 0]
image = Image.fromarray(buffer)
return image
def calibrate(self):
"""Calibrate the E-Paper display
Uses the Display class to calibrate the display with the default of 3
cycles. After a refresh cycle, a new image is generated and shown.
"""
self.Display.calibrate()
def _calibration_check(self):
"""Calibration sheduler
uses calibration hours from settings file to check if calibration is due"""
now = arrow.now()
# print('hour:', now.hour, 'hours:', self._calibration_hours)
# print('state:', self._calibration_state)
if now.hour in self._calibration_hours and self._calibration_state == False:
self.calibrate()
self._calibration_state = True
else:
self._calibration_state = False
@classmethod
def add_module(cls, filepath):
"""registers a third party module for inkycal.
Uses the full filepath of the third party module to check if it is inside
the correct folder, then checks if it's an inkycal module. Lastly, the
init files in /inkycal and /inkycal/modules are updated to allow using
the new module.
Args:
- filepath: The full filepath of the third party module. Modules should be
in Inkycal/inkycal/modules.
Usage:
- download a third-party module. The exact link is provided by the
developer of that module and starts with
`https://raw.githubusercontent.com/...`
enter the following in bash to download a module::
$ cd Inkycal/inkycal/modules #navigate to modules folder in inkycal
$ wget https://raw.githubusercontent.com/... #download the module
then register it with this function::
>>> from inkycal import Inkycal
>>> Inkycal.add_module('/full/path/to/the/module/in/inkycal/modules.py')
"""
module_folder = top_level + '/inkycal/modules'
if module_folder in filepath:
filename = filepath.split('.py')[0].split('/')[-1]
# Extract name of class from given module and validate if it's an inkycal
# module
with open(filepath, mode='r') as module:
module_content = module.read().splitlines()
for line in module_content:
if '(inkycal_module):' in line:
classname = line.split(' ')[-1].split('(')[0]
break
if not classname:
raise TypeError("your module doesn't seem to be a correct inkycal module.."
"Please check your module again.")
# Check if filename or classname exists in init of module folder
with open(module_folder + '/__init__.py', mode='r') as file:
module_init = file.read().splitlines()
print('checking module init file..')
for line in module_init:
if filename in line:
raise Exception(
"A module with this filename already exists! \n"
"Please consider renaming your module and try again."
)
if classname in line:
raise Exception(
"A module with this classname already exists! \n"
"Please consider renaming your class and try again."
)
print('OK!')
# Check if filename or classname exists in init of inkycal folder
with open(top_level + '/inkycal/__init__.py', mode='r') as file:
inkycal_init = file.read().splitlines()
print('checking inkycal init file..')
for line in inkycal_init:
if filename in line:
raise Exception(
"A module with this filename already exists! \n"
"Please consider renaming your module and try again."
)
if classname in line:
raise Exception(
"A module with this classname already exists! \n"
"Please consider renaming your class and try again."
)
print('OK')
# If all checks have passed, add the module in the module init file
with open(module_folder + '/__init__.py', mode='a') as file:
file.write(f'from .{filename} import {classname} # Added by module adder')
# If all checks have passed, add the module in the inkycal init file
with open(top_level + '/inkycal/__init__.py', mode='a') as file:
file.write(f'import inkycal.modules.{filename} # Added by module adder')
print(f"Your module '{filename}' with class '{classname}' has been added "
"successfully! Hooray!")
return
# Check if module is inside the modules folder
raise Exception(f"Your module should be in {module_folder} "
f"but is currently in {filepath}")
@classmethod
def remove_module(cls, filename, remove_file=True):
"""unregisters an inkycal module.
Looks for given filename.py in /modules folder, removes entries of that
module in init files inside /inkycal and /inkycal/modules
Args:
- filename: The filename (with .py ending) of the module which should be
unregistered. e.g. `'mymodule.py'`
- remove_file: ->bool (True/False). If set to True, the module is deleted
after unregistering it, else it remains in the /modules folder
Usage:
- Look for the module in Inkycal/inkycal/modules which should be removed.
Only the filename (with .py) is required, not the full path.
Use this function to unregister the module from inkycal::
>>> from inkycal import Inkycal
>>> Inkycal.remove_module('mymodule.py')
"""
module_folder = top_level + '/inkycal/modules'
# Check if module is inside the modules folder and extract classname
try:
with open(f"{module_folder}/{filename}", mode='r') as file:
module_content = file.read().splitlines()
for line in module_content:
if '(inkycal_module):' in line:
classname = line.split(' ')[-1].split('(')[0]
break
if not classname:
print('The module you are trying to remove is not an inkycal module.. '
'Not removing it.')
return
except FileNotFoundError:
print(f"No module named {filename} found in {module_folder}")
return
filename = filename.split('.py')[0]
# Create a memory backup of /modules init file
with open(module_folder + '/__init__.py', mode='r') as file:
module_init = file.read().splitlines()
print('removing line from module_init')
# Remove lines that contain classname
with open(module_folder + '/__init__.py', mode='w') as file:
for line in module_init:
if not classname in line:
file.write(line + '\n')
else:
print('found, removing')
# Create a memory backup of inkycal init file
with open(f"{top_level}/inkycal/__init__.py", mode='r') as file:
inkycal_init = file.read().splitlines()
print('removing line from inkycal init')
# Remove lines that contain classname
with open(f"{top_level}/inkycal/__init__.py", mode='w') as file:
for line in inkycal_init:
if filename in line:
print('found, removing')
else:
file.write(line + '\n')
# remove the file of the third party module if it exists and remove_file
# was set to True (default)
if os.path.exists(f"{module_folder}/{filename}.py") and remove_file is True:
print('deleting module file')
os.remove(f"{module_folder}/{filename}.py")
print(f"Your module '{filename}' with class '{classname}' was removed.")
if __name__ == '__main__':
print(f'running inkycal main in standalone/debug mode')