def start_handler(server,processes,id):
iterator = 1
pipes = []
open_pipes = []
#clear msg pipes for subprocesses
os.system("rm -f -r temp/pipes_intern/*")
#clear logfile directory, but keep daemon.log
os.system("cd logfiles && ls * | grep -v daemon.log | xargs rm -rf")
#create pipes for every subprocess in
for pro in processes:
#create stderr pipe
err_name = "temp/pipes_intern/err_"+pro.name.split('.')[0]+"_"+str(iterator)
os.mkfifo(err_name)
pipes.append(err_name)
#create out pipe
out_name = "temp/pipes_intern/out_"+pro.name.split('.')[0]+"_"+str(iterator)
os.mkfifo(out_name)
pipes.append(out_name)
#give name of pipes to process
pro.stout = out_name
pro.sterr = err_name
#create logfile for module
log_name = "logfiles/"+pro.name.split('.')[0]+"_"+str(iterator)+".log"
os.system("touch "+log_name)
#increment iterator
iterator = iterator+1
#start handler as subprocess
new_pid = os.fork()
if new_pid == 0:
open_pipes = [open(pipe,'r') for pipe in pipes]
while True:
ready_pipes = select.select(open_pipes,[],[])[0]
for pipe in ready_pipes:
#analyze information given by pipe
pipe_name = pipe.name.split('/')[-1]
pipe_name_splitted = pipe_name.split('_')
msg_type = pipe_name_splitted[0]
#rebuilding the module name even with '_' in the name
module_name_list = pipe_name_splitted[1:-1]
module_name = module_name_list[0]
for name in module_name_list[1:]:
module_name = module_name + '_' + name
iterator = pipe_name_splitted[-1]
#read from pipe
data = pipe.readline()
if data != "" and data != " ":
#write to logfile
log_name = "logfiles/"+module_name+"_"+str(iterator)+".log"
file = open(log_name,'a')
file.write(data)
file.close()
#send to debug window of server
socket_send_msg(server,"Pi "+str(id)+", "+module_name+": "+data)
return new_pid,processes
def is_online(sockets):
if sockets != -1:
for soc in sockets:
ip = soc.getpeername()
socket_send_msg(soc, "isonline")
socket_receive_msg(soc)
print(str(ip) + " is connected")
else:
print("Sockets not connected yet")
def connect(xmlfile, connected, sockets):
if xmlfile == "":
print("Set xml-file before connecting")
return -1, 0
if connected == 1:
for soc in sockets:
socket_send_msg(soc, "reconnect")
time.sleep(1)
root_as_string = parse_xml(xmlfile)
root = objectify.fromstring(root_as_string)
nodes = []
cmd_sockets = []
for element in root.getchildren():
nodes.append(etree.tostring(element))
# do for every pi
for node in nodes:
# connect to pi
ip = ""
try:
int(objectify.fromstring(node).get("pi_id"))
ip = "10.1.1." + objectify.fromstring(node).get("pi_id")
except Exception:
ip = objectify.fromstring(node).get("pi_id")
try:
soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
soc.connect((ip, 9999))
cmd_sockets.append(soc)
print("Connected to cmd of " + str(ip))
except Exception as e:
print e
print "Unable to connect to cmd of {}".format(ip)
if len(cmd_sockets) < 1:
return -1, 0
else:
return cmd_sockets, 1
def start(xmlfile, sockets):
if (xmlfile == "") or (sockets == -1):
print("Set xml-file and connect before starting")
return -1
print("Start: " + xmlfile)
root_as_string = parse_xml(xmlfile)
root = objectify.fromstring(root_as_string)
nodes = []
for element in root.getchildren():
nodes.append(etree.tostring(element))
#do for every pi
for node, soc in zip(nodes, sockets):
try:
int(objectify.fromstring(node).get("pi_id"))
ip = "10.1.1." + objectify.fromstring(node).get("pi_id")
#send 'start' command to pi and wait for 'ack'
socket_send_msg(soc, "start")
socket_receive_msg(soc)
socket_send_msg(soc, node)
socket_receive_msg(soc)
print([ip + " is ready"])
except Exception:
ip = objectify.fromstring(node).get("pi_id")
#send 'start' command to pi and wait for 'ack'
socket_send_msg(soc, "start")
socket_receive_msg(soc)
socket_send_msg(soc, node)
socket_receive_msg(soc)
print([ip + " is ready"])
for soc in sockets:
socket_send_msg(soc, "start")
return
def start(server_cmd,server_msg,id):
#no subprocesses running
subprocesses = []
#get objects from the server
processes,connections_in,connections_out = get_objects(server_cmd)
#initialize pipes
init_pipes(processes)
#initialize ingoing connections
subprocesses = subprocesses + init_ingoing_connections(connections_in)
#initialize outgoing connections
subprocesses = subprocesses + init_outgoing_connections(connections_out)
#open read pipes (non blocking!)
processes = open_ingoing_pipes(processes)
#start message handler
handler,processes=start_handler(server_msg,processes,id)
running = 1
#wait for starting signal from server (synchronization)
try:
socket_send_msg(server_cmd,"ready")
socket_receive_msg(server_cmd)
except Exception as e:
log("synchronization with server failed")
log(type(e))
log(e)
#open write pipes
processes = open_outgoing_pipes(processes)
#run processes
log("execute processes")
subprocesses = subprocesses + execute_processes(processes)
return subprocesses,running,handler
def exit_server(sockets):
if sockets != -1:
for soc in sockets:
socket_send_msg(soc, "reconnect")
sys.exit()
def get_objects(server_socket):
processes = []
connections_in = []
connections_out = []
dir_iterator = 1
pipe_path = "/home/asn/asn_daemon/temp/pipes_system/fifo_"
#send 'ack' to server to begin with transfer
socket_send_msg(server_socket, "CMD ack")
#receive data
try:
rootString = socket_receive_msg(server_socket)
except Exception as e:
log("Receiving data from server failed")
log(type(e))
log(e)
#parse data
root = objectify.fromstring(rootString)
#get Pi-id
pi_id = root.get("pi_id")
#loop through executables
for p in root.getchildren():
input = []
output = []
parameter = ''
#get name of executable
name = p.get('executable')
#get path
slash = name.rfind('/')
path = 'system/' + str(dir_iterator)
if slash != -1:
path = path + '/' + name[:slash]
dir_iterator = dir_iterator + 1
#loop through parameters (input/output pipes and additional params)
for atom in p.getchildren():
# collect input pipes
if (atom.tag == 'input'):
pipe_id = atom.get("pipe_id")
pipe_name = pipe_path + str(pipe_id)
input.append(pipe_name)
#register ingoing nc connection if necessary
if atom.get("source_pi_id") != pi_id:
try:
int(pi_id)
connections_in.append(
NCcon_c("10.1.1." + str(pi_id),
(1000 + int(pipe_id)), pipe_name))
except Exception:
connections_in.append(
NCcon_c(str(pi_id), (1000 + int(pipe_id)),
pipe_name))
# collect output fifos
if (atom.tag == 'output'):
pipe_id = atom.get("pipe_id")
pipe_name = pipe_path + str(pipe_id)
output.append(pipe_name)
#register outgoing nc connection if necessary
target_id = atom.get("target_pi_id")
if target_id != pi_id:
try:
int(target_id)
connections_out.append(
NCcon_c("10.1.1." + target_id,
(1000 + int(pipe_id)), pipe_name))
except Exception:
connections_out.append(
NCcon_c(target_id, (1000 + int(pipe_id)),
pipe_name))
# collect parameter
if (atom.tag == 'parameter'):
param = atom.get("param")
parameter = parameter + param + " "
# append new process
processes.append(process_c(input, output, path, name, parameter))
return processes, connections_in, connections_out
def gentleAbort(sockets):
if sockets == -1:
print("Sockets not connected yet")
return
for so in sockets:
socket_send_msg(so, "gentleAbort")
elif command == "delete":
delete_data()
elif command == "reconnect":
try:
server_cmd, server_msg = reconnect(ip)
except Exception as e:
log("reconnect method failed")
log(type(e))
log(e)
elif command == "isonline":
try:
socket_send_msg(server_cmd, "online")
except Exception as e:
log("sending online status failed")
log(type(e))
log(e)
def delete(sockets):
if sockets == -1:
print("Not connected")
return
for so in sockets:
socket_send_msg(so, "delete")