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astm_bidirectional_general.py
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astm_bidirectional_general.py
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#!/usr/bin/python3
import astm_bidirectional_conf as conf
import time, logging, socket, select
class astmi(object):
read_msg=b''
write_msg=b''
read_set=set()
write_set=set()
error_set=set()
readable=set()
writable=set()
exceptional=set()
def print_to_log(self,my_object,special_message):
self.logger.debug('Start=========')
self.logger.debug(my_object)
self.logger.debug(special_message)
self.logger.debug('End=========')
###################################
#override this function in subclass
###################################
def manage_read(self,data):
self.write_set.add(self.conn[0]) #Add in write set, for next select() to make it writable
self.error_set=self.read_set.union(self.write_set) #update error set
if(data==b'pineapple\n'):
self.write_msg=b'Demo manage_read() override me. pinapple is yellow\n'
if(data==b'apple\n'):
self.write_msg=b'Demo manage_read() override me. apple is Red\n'
def manage_write(self):
#Send message in response to write_set->select->writable initiated by manage_read() and initiate_write()
self.conn[0].send(self.write_msg)
self.write_set.remove(self.conn[0]) #now no message pending, so remove it from write set
self.error_set=self.read_set.union(self.write_set) #update error set
###################################
#override this function in subclass
###################################
def initiate_write(self):
self.write_set.add(self.conn[0]) #Add in write set, for next select() to make it writable
self.error_set=self.read_set.union(self.write_set) #update error set
self.write_msg=b'Demo initiate_write() override me. send apple, pineapple \n' #set message
def __init__(self):
logging.basicConfig(filename=conf.log_filename,level=logging.DEBUG)
self.logger = logging.getLogger('astm_interactive')
self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.s.setsockopt(socket.SOL_SOCKET,socket.SO_KEEPALIVE, 1)
self.s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 1)
self.s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 3)
self.s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 5)
self.select_timeout=conf.select_timeoutt #second
try:
self.s.bind((conf.host_address,int(conf.host_port))) #it is a tuple
except Exception as my_exception:
self.print_to_log(my_exception,'bind() failed, ip/port correct??Quitting')
quit()
self.s.listen(2)
self.print_to_log(self.s,'select() is waiting..')
self.readable, self.writable, self.exceptional = select.select((self.s,),(self.s,),(self.s,))
self.print_to_log(self.s,'select() detected activity')
if(self.s in self.exceptional):
self.print_to_log(self.s,'some error on socket s. quitting')
quit()
if(self.s in self.writable):
self.print_to_log(self.s,'Can not understand why s is writting')
quit()
if(self.s in self.readable):
self.conn = self.s.accept()
self.print_to_log(self.s,'Connection request is read')
self.conn[0].setblocking(0)
def astmi_loop(self):
#First set
#not tuple it is unmutable
#not list, we need uniq values in error list which is sum of read and write
self.read_set={self.s,self.conn[0]}
self.write_set=set() #must be managed when send is required, otherwise use 100% CPU to check writable buffer
self.error_set=self.read_set.union(self.write_set)
while True:
#self.print_to_log('','before select')
self.readable, self.writable, self.exceptional = select.select(self.read_set,self.write_set,self.error_set,self.select_timeout)
#self.print_to_log('','after select')
###if anybody else try to connect, reject it
if(self.s in self.exceptional):
self.print_to_log(self.s,'some error on socket s. quitting')
quit()
if(self.s in self.writable):
self.print_to_log(self.s,'Can not understand why s is writting')
quit()
if(self.s in self.readable):
dummy_conn = self.s.accept()
self.print_to_log(self.s,'Connection request is read, This is second connection. We do not want it. shutdown, distroy')
dummy_conn[0].shutdown(socket.SHUT_RDWR)
dummy_conn[0].close()
###For client do work
if(self.conn[0] in self.exceptional):
self.print_to_log(self.conn[0],'some error on socket conn. quitting')
quit()
if(self.conn[0] in self.writable):
#sending message (somewhere else conn[0] was added in writable and self.write_msg was given value
self.print_to_log(self.conn[0],'conn is writable. using send')
self.manage_write()
if(self.conn[0] in self.readable):
self.print_to_log(self.conn[0],'Conn have sent some data')
data=self.conn[0].recv(1024)
self.print_to_log(self.conn[0],data)
self.manage_read(data)
#if EOF 1)close socket 2)remove from list 3)accept new
if(data==b''):
self.print_to_log(self.conn[0],'Conn have closed, accepting new connection')
#1) close socket
self.conn[0].shutdown(socket.SHUT_RDWR)
self.conn[0].close()
#2)remove from read list
#no if:() for read_set because, we reached here due to its present in read_set
self.read_set.remove(self.conn[0])
#write list with if exist
if(self.conn[0] in self.write_set):
self.write_set.remove(self.conn[0])
#error list is union
#so, no need to manage
#finally error_set
self.error_set=self.read_set.union(self.write_set)
#3) Accept new, add to read set
self.conn = self.s.accept()
self.print_to_log(self.s,'New Connection request is read')
self.conn[0].setblocking(0)
self.read_set.add(self.conn[0])
self.error_set=self.read_set.union(self.write_set)
#If select return due to timeout -> all three tuples are empty
#probably there is no nagging from client
#This is ideal time to start nagging client
#print('lenghts:', len(self.readable), len(self.writable), len(self.exceptional))
if(len(self.readable)==0 and len(self.writable)==0 and len(self.exceptional)==0):
self.print_to_log('readable, writable,exceptional are silent','Let me do somethin else')
self.initiate_write()
#Main Code###############################
#use this to device your own script
if __name__=='__main__':
#print('__name__ is ',__name__,',so running code')
while True:
m=astmi()
m.astmi_loop()
#break; #useful during debugging