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import traceback
import multiprocessing
import time
import sys
from core.interact import interact as io
class Subprocessor(object):
class SilenceException(Exception):
pass
class Cli(object):
def __init__ ( self, client_dict ):
s2c = multiprocessing.Queue()
c2s = multiprocessing.Queue()
self.p = multiprocessing.Process(target=self._subprocess_run, args=(client_dict,s2c,c2s) )
self.s2c = s2c
self.c2s = c2s
self.p.daemon = True
self.p.start()
self.state = None
self.sent_time = None
self.sent_data = None
self.name = None
self.host_dict = None
def kill(self):
self.p.terminate()
self.p.join()
#overridable optional
def on_initialize(self, client_dict):
#initialize your subprocess here using client_dict
pass
#overridable optional
def on_finalize(self):
#finalize your subprocess here
pass
#overridable
def process_data(self, data):
#process 'data' given from host and return result
raise NotImplementedError
#overridable optional
def get_data_name (self, data):
#return string identificator of your 'data'
return "undefined"
def log_info(self, msg): self.c2s.put ( {'op': 'log_info', 'msg':msg } )
def log_err(self, msg): self.c2s.put ( {'op': 'log_err' , 'msg':msg } )
def progress_bar_inc(self, c): self.c2s.put ( {'op': 'progress_bar_inc' , 'c':c } )
def _subprocess_run(self, client_dict, s2c, c2s):
self.c2s = c2s
data = None
is_error = False
try:
self.on_initialize(client_dict)
c2s.put ( {'op': 'init_ok'} )
while True:
msg = s2c.get()
op = msg.get('op','')
if op == 'data':
data = msg['data']
result = self.process_data (data)
c2s.put ( {'op': 'success', 'data' : data, 'result' : result} )
data = None
elif op == 'close':
break
time.sleep(0.001)
self.on_finalize()
c2s.put ( {'op': 'finalized'} )
except Subprocessor.SilenceException as e:
c2s.put ( {'op': 'error', 'data' : data} )
except Exception as e:
err_msg = traceback.format_exc()
c2s.put ( {'op': 'error', 'data' : data, 'err_msg' : err_msg} )
c2s.close()
s2c.close()
self.c2s = None
# disable pickling
def __getstate__(self):
return dict()
def __setstate__(self, d):
self.__dict__.update(d)
#overridable
def __init__(self, name, SubprocessorCli_class, no_response_time_sec = 0, io_loop_sleep_time=0.005, initialize_subprocesses_in_serial=False):
if not issubclass(SubprocessorCli_class, Subprocessor.Cli):
raise ValueError("SubprocessorCli_class must be subclass of Subprocessor.Cli")
self.name = name
self.SubprocessorCli_class = SubprocessorCli_class
self.no_response_time_sec = no_response_time_sec
self.io_loop_sleep_time = io_loop_sleep_time
self.initialize_subprocesses_in_serial = initialize_subprocesses_in_serial
#overridable
def process_info_generator(self):
#yield per process (name, host_dict, client_dict)
raise NotImplementedError
#overridable optional
def on_clients_initialized(self):
#logic when all subprocesses initialized and ready
pass
#overridable optional
def on_clients_finalized(self):
#logic when all subprocess finalized
pass
#overridable
def get_data(self, host_dict):
#return data for processing here
raise NotImplementedError
#overridable
def on_data_return (self, host_dict, data):
#you have to place returned 'data' back to your queue
raise NotImplementedError
#overridable
def on_result (self, host_dict, data, result):
#your logic what to do with 'result' of 'data'
raise NotImplementedError
#overridable
def get_result(self):
#return result that will be returned in func run()
return None
#overridable
def on_tick(self):
#tick in main loop
#return True if system can be finalized when no data in get_data, orelse False
return True
#overridable
def on_check_run(self):
return True
def run(self):
if not self.on_check_run():
return self.get_result()
self.clis = []
def cli_init_dispatcher(cli):
while not cli.c2s.empty():
obj = cli.c2s.get()
op = obj.get('op','')
if op == 'init_ok':
cli.state = 0
elif op == 'log_info':
io.log_info(obj['msg'])
elif op == 'log_err':
io.log_err(obj['msg'])
elif op == 'error':
err_msg = obj.get('err_msg', None)
if err_msg is not None:
io.log_info(f'Error while subprocess initialization: {err_msg}')
cli.kill()
self.clis.remove(cli)
break
#getting info about name of subprocesses, host and client dicts, and spawning them
for name, host_dict, client_dict in self.process_info_generator():
try:
cli = self.SubprocessorCli_class(client_dict)
cli.state = 1
cli.sent_time = 0
cli.sent_data = None
cli.name = name
cli.host_dict = host_dict
self.clis.append (cli)
if self.initialize_subprocesses_in_serial:
while True:
cli_init_dispatcher(cli)
if cli.state == 0:
break
io.process_messages(0.005)
except:
raise Exception (f"Unable to start subprocess {name}. Error: {traceback.format_exc()}")
if len(self.clis) == 0:
raise Exception ("Unable to start Subprocessor '%s' " % (self.name))
#waiting subprocesses their success(or not) initialization
while True:
for cli in self.clis[:]:
cli_init_dispatcher(cli)
if all ([cli.state == 0 for cli in self.clis]):
break
io.process_messages(0.005)
if len(self.clis) == 0:
raise Exception ( "Unable to start subprocesses." )
#ok some processes survived, initialize host logic
self.on_clients_initialized()
#main loop of data processing
while True:
for cli in self.clis[:]:
while not cli.c2s.empty():
obj = cli.c2s.get()
op = obj.get('op','')
if op == 'success':
#success processed data, return data and result to on_result
self.on_result (cli.host_dict, obj['data'], obj['result'])
self.sent_data = None
cli.state = 0
elif op == 'error':
#some error occured while process data, returning chunk to on_data_return
err_msg = obj.get('err_msg', None)
if err_msg is not None:
io.log_info(f'Error while processing data: {err_msg}')
if 'data' in obj.keys():
self.on_data_return (cli.host_dict, obj['data'] )
#and killing process
cli.kill()
self.clis.remove(cli)
elif op == 'log_info':
io.log_info(obj['msg'])
elif op == 'log_err':
io.log_err(obj['msg'])
elif op == 'progress_bar_inc':
io.progress_bar_inc(obj['c'])
for cli in self.clis[:]:
if cli.state == 1:
if cli.sent_time != 0 and self.no_response_time_sec != 0 and (time.time() - cli.sent_time) > self.no_response_time_sec:
#subprocess busy too long
print ( '%s doesnt response, terminating it.' % (cli.name) )
self.on_data_return (cli.host_dict, cli.sent_data )
cli.kill()
self.clis.remove(cli)
for cli in self.clis[:]:
if cli.state == 0:
#free state of subprocess, get some data from get_data
data = self.get_data(cli.host_dict)
if data is not None:
#and send it to subprocess
cli.s2c.put ( {'op': 'data', 'data' : data} )
cli.sent_time = time.time()
cli.sent_data = data
cli.state = 1
if self.io_loop_sleep_time != 0:
io.process_messages(self.io_loop_sleep_time)
if self.on_tick() and all ([cli.state == 0 for cli in self.clis]):
#all subprocesses free and no more data available to process, ending loop
break
#gracefully terminating subprocesses
for cli in self.clis[:]:
cli.s2c.put ( {'op': 'close'} )
cli.sent_time = time.time()
while True:
for cli in self.clis[:]:
terminate_it = False
while not cli.c2s.empty():
obj = cli.c2s.get()
obj_op = obj['op']
if obj_op == 'finalized':
terminate_it = True
break
if (time.time() - cli.sent_time) > 30:
terminate_it = True
if terminate_it:
cli.state = 2
cli.kill()
if all ([cli.state == 2 for cli in self.clis]):
break
#finalizing host logic and return result
self.on_clients_finalized()
return self.get_result()
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