doorpi/keyboard/from_filesystem.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import logging
logger = logging.getLogger(__name__)
logger.debug("%s loaded", __name__)
import os
import ntpath
from time import sleep
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
from doorpi.keyboard.AbstractBaseClass import KeyboardAbstractBaseClass, HIGH_LEVEL, LOW_LEVEL
import doorpi
def path_leaf(path):
head, tail = ntpath.split(path)
return tail or ntpath.basename(head)
class MissingMandatoryParameter(Exception): pass
def get(**kwargs): return FileSystem(**kwargs)
class FileSystem(KeyboardAbstractBaseClass, FileSystemEventHandler):
__reset_file = None
def __init__(self, input_pins, output_pins, conf_pre, conf_post, keyboard_name, polarity = 0, *args, **kwargs):
logger.debug("FileSystem.__init__(input_pins = %s, output_pins = %s, polarity = %s)",
input_pins, output_pins, polarity)
self.keyboard_name = keyboard_name
self._polarity = polarity
self._InputPins = map(str, input_pins)
self._OutputPins = map(str, output_pins)
section_name = conf_pre+'keyboard'+conf_post
self.__reset_input = doorpi.DoorPi().config.get_bool(section_name, 'reset_input', True)
self.__base_path_input = doorpi.DoorPi().config.get_string_parsed(section_name, 'base_path_input')
self.__base_path_output = doorpi.DoorPi().config.get_string_parsed(section_name, 'base_path_output')
if self.__base_path_input == '': raise MissingMandatoryParameter('base_path_input in %s '%section_name)
if self.__base_path_output == '': raise MissingMandatoryParameter('base_path_output in %s '%section_name)
if not os.path.exists(os.path.dirname(self.__base_path_input)):
logger.info('Path %s does not exist - creating it now', os.path.dirname(self.__base_path_input))
os.makedirs(os.path.dirname(self.__base_path_input))
if not os.path.exists(os.path.dirname(self.__base_path_output)):
logger.info('Path %s does not exist - creating it now', os.path.dirname(self.__base_path_output))
os.makedirs(os.path.dirname(self.__base_path_output))
for input_pin in self._InputPins:
self.__set_input(os.path.join(self.__base_path_input, input_pin))
self._register_EVENTS_for_pin(input_pin, __name__)
self.__observer = Observer()
self.__observer.schedule(self, self.__base_path_input)
self.__observer.start()
# use set_output to register status @ dict self.__OutputStatus
for output_pin in self._OutputPins:
self.set_output(output_pin, 0, False)
self.register_destroy_action()
def destroy(self):
if self.is_destroyed: return
logger.debug("destroy")
self.__observer.stop()
self.__observer.join()
for input_pin in self._InputPins:
os.remove(os.path.join(self.__base_path_input, input_pin))
for output_pin in self._OutputPins:
os.remove(os.path.join(self.__base_path_output, output_pin))
doorpi.DoorPi().event_handler.unregister_source(__name__, True)
self.__destroyed = True
def status_input(self, pin):
f = open(os.path.join(self.__base_path_input, pin), 'r')
plain_value = f.readline().rstrip()
f.close()
if self._polarity is 0:
return str(plain_value).lower() in HIGH_LEVEL
else:
return str(plain_value).lower() in LOW_LEVEL
def __write_file(self, file, value = False):
f = open(file, 'w')
value = str(value).lower() in HIGH_LEVEL
if self._polarity is 1: value = not value
f.write(str(value)+'\r\n')
f.close()
return value
def __set_input(self, file, value = False):
self.__write_file(file, value)
os.chmod(file, 0o666)
def set_output(self, pin, value, log_output = True):
parsed_pin = doorpi.DoorPi().parse_string("!"+str(pin)+"!")
if parsed_pin != "!"+str(pin)+"!":
pin = parsed_pin
value = str(value).lower() in HIGH_LEVEL
log_output = str(log_output).lower() in HIGH_LEVEL
if pin not in self._OutputPins: return False
written_value = self.__write_file(os.path.join(self.__base_path_output, pin), value)
if log_output: logger.debug("out(pin = %s, value = %s, log_output = %s)", pin, written_value, log_output)
self._OutputStatus[pin] = value
return True
def on_modified(self, event):
if 'FileModifiedEvent' not in str(event): return
if self.__reset_file:
if self.__reset_file == event.src_path:
self.__reset_file = None
logging.debug('reset inputfile will not fire event (%s)', event.src_path)
return
self.__reset_file = event.src_path
self.__set_input(event.src_path, 'false')
input_pin = path_leaf(event.src_path)
if input_pin not in self._InputPins: return
if self.status_input(input_pin):
self.__reset_file = event.src_path
self._fire_OnKeyPressed(input_pin, __name__)
self._fire_OnKeyDown(input_pin, __name__)
else:
self._fire_OnKeyUp(input_pin, __name__)