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http_controller.py
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executable file
·219 lines (186 loc) · 8.29 KB
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#!/usr/bin/python
from socket import *
from threading import Thread, Event
from Queue import Queue, Empty, Full
import logging
from time import sleep
from sys import platform
from os import path, makedirs
# #####################Logging setup##########################################
log = logging.getLogger('http_controller_module')
log.setLevel(logging.DEBUG)
# create a file handler
if 'win' in platform:
log_dir = 'C:\ProgramData\connectduino\logs\\'
else:
log_dir = '/var/log/connectduino/'
if not path.exists(log_dir):
makedirs(log_dir)
file_name = 'httpduino.log'
handler = logging.FileHandler(path.join(log_dir, file_name))
handler.setLevel(logging.DEBUG)
#create a Logging format
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
#add the handlers to the Logger
log.addHandler(handler)
class HttpController:
def __init__(self, a_queue, port=18200):
self.log = logging.getLogger('http_controller_module.HttpController')
self.log.debug('creating httpcontroller')
self.shutdown_event = Event()
self.connection_listener = HttpConnectionListener(port, a_queue, self.shutdown_event)
self.connection_listener.start()
self.connection_listener = None
def wait_for_shutdown(self):
self.shutdown_event.set()
while self.shutdown_event.is_set():
try:
self.log.debug('waiting for shutdown')
sleep(2)
except:
self.log.exception('exception thrown while waiting for HttpConnectionListener to shutdown.')
self.shutdown_event.clear()
self.log.debug("exiting shutdown()")
def shutdown(self):
# self.wait_for_shutdown()
self.shutdown_event.set()
self.log.debug("in shutdown() self.shutdown_event = " + str(self.shutdown_event.is_set()))
while self.shutdown_event.is_set():
pass
self.log.debug("in shutdown() self.shutdown_event = " + str(self.shutdown_event.is_set()) + "shutting down.")
class HttpConnectionListener(Thread):
def __init__(self, listening_port, queue, shutdown_event):
super(HttpConnectionListener, self).__init__()
self.log = logging.getLogger('http_controller_module.HttpConnectionListener')
self.port = listening_port # port to listen on for new connections
self.shutdown_event = shutdown_event
self.queue = queue
self.connections = {} # maps ports to events
self.connection_events = {}
self.log.debug("Creating HttpConnectionListener")
def run(self):
host = ''
self.log.debug("creating socket")
listener = socket(AF_INET, SOCK_STREAM)
listener.settimeout(.5)
listener.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
try:
self.log.debug("binding to port " + str(self.port))
listener.bind((host, self.port))
self.log.debug("listening for connections")
listener.listen(5)
except:
self.log.exception('exception thrown while binding to listening socket at port ' + str(self.port))
self.shutdown_listeners()
try:
self.log.debug("waiting for incoming connections")
while not self.shutdown_event.is_set():
self.remove_dead_connections()
try:
(clientsocket, address) = listener.accept()
self.log.debug('got connection from ' + str(address))
self.connection_events[address] = Event()
clientsocket.settimeout(20)
HttpListener(address, clientsocket, self.queue, self.connection_events[address]).start()
except timeout:
pass
except:
self.log.exception('exception thrown while accepting new connections')
break
except:
self.log.exception('exception thrown while listening to new connections')
finally:
self.log.info('Shutting down HttpConnectionListener thread')
self.shutdown_listeners()
listener.close()
def shutdown_listeners(self):
self.log.debug('Shutting down ' + str(len(self.connection_events)) + ' connections')
for address, event in self.connection_events.iteritems():
event.set()
while len(self.connection_events) > 0:
self.remove_dead_connections(False)
self.shutdown_event.clear()
def remove_dead_connections(self, event_state=True):
dead_ports = []
for addr, event in self.connection_events.iteritems():
if event.is_set() == event_state:
dead_ports.append(addr)
for addr in dead_ports:
self.log.debug('removing connection ' + str(addr[1]))
del self.connection_events[addr]
class HttpListener(Thread):
def __init__(self, addr, socket, queue, event):
super(HttpListener, self).__init__()
self.log = logging.getLogger('http_controller_module.HttpListener')
self.log.debug("creating listener on addr = " + str(addr))
self.addr = addr
self.queue = queue
self.socket = socket
self.shutdown_event = event
def run(self):
log.debug('connecting an http listener on addr(' + str(self.addr[0]) + ', ' + str(self.addr[1]) + ')')
shutdown_str = 'http listener on addr(' + str(self.addr[0]) + ', ' + str(self.addr[1]) + ') closing'
while not self.shutdown_event.is_set():
try:
data = self.socket.recv(1024)
if data:
try:
log.debug('queuing data')
self.queue.put_nowait(data)
except Full:
log.error('queue is full discarding data = ' + data)
else:
self.log.debug('data queued = ' + data)
else:
self.close_down_listener(['socket disconnection occurred on addr(' + str(self.addr[0]) + ', ' +
str(self.addr[1]) + ') closing socket',
shutdown_str], True)
return
except timeout:
self.log.debug('timeout occurred on addr(' + str(self.addr[0]) + ', ' + str(self.addr[1]) + ')')
if not self.shutdown_event.is_set():
self.close_down_listener(['dead http listener on addr(' +
str(self.addr[0]) + ', ' + str(self.addr[1]) + ') closing',
shutdown_str], True)
return
self.close_down_listener(['closing socket for addr(' + str(self.addr[0]) + ', ' + str(self.addr[1]) + ')',
shutdown_str])
def close_down_listener(self, output_list, set_event=False):
for output in output_list:
self.log.info(output)
if set_event:
self.shutdown_event.set()
else:
self.shutdown_event.clear()
self.socket.close()
if __name__ == '__main__':
def analyze_queue(data_list):
for i, data in enumerate(sorted(data_list)):
if i != data:
return False
return True
log.info('\n\n#######################Starting up Server############################')
queue = Queue()
log.info('creating connection_listener')
connection_listener = HttpController(queue)
nums = []
try:
while True:
try:
#log.debug('getting value')
val = queue.get(timeout=.05)
queue.task_done()
# log.debug('done getting value')
except Empty:
#log.debug("queue empty on get call") # noisy logging
pass
except KeyboardInterrupt:
log.info('Keyboard interrupt received. Shutting down connection listeners')
print '\nShutting down remaining open listeners please wait...'
connection_listener.shutdown()
log.info('length of array = ' + str(len(nums)))
log.info(str(sorted(nums)))
log.info('All present: ' + str(analyze_queue(nums)))
log.info('Shutting down main')
print 'Closing program'