kivyblocks/kivyblocks/udp_widget.py
2021-08-15 16:57:20 +08:00

134 lines
3.6 KiB
Python

try:
import ujson as json
except:
import json
import time
import zlib
from kivy.logger import Logger
from kivy.event import EventDispatcher
from kivy.clock import Clock
from appPublic.udp_comm import UdpComm
from appPublic.dataencoder import DataEncoder
class UdpWidget(EventDispatcher):
def __init__(self, udp_port=55000, cert_file=None, commands=[],
**kw):
super(UdpWidget, self).__init__(**kw)
self.udp_port = udp_port
self.commands = commands
self.block_commands = []
self.udp_transport = UdpComm(udp_port, self.comm_callback)
host = self.udp_transport.host
self.dataencoder = DataEncoder(host, self.get_peer_pubkey)
self.inner_handlers = {
'get_pubkey':self.resp_pubkey,
'set_pubkey':self.set_pubkey
}
for cmd in self.commands:
evt_name = 'on_%s' % cmd
setattr(self, evt_name, self.my_event_handler)
self.register_event_type(evt_name)
# print('udp_widget.py:register', evt_name, self.my_event_handler)
self.get_peer_pubkey()
Clock.schedule_once(self.get_peer_pubkey_loop, 2)
def block_command(self, cmd):
if cmd not in self.command:
return
if cmd in self.block_command:
return
self.block_commands.append(cmd)
def unblock_command(self, cmd):
if cmd not in self.block_command:
return
self.block_commands = [ c for c in self.block_command if c!=cmd ]
def get_peer_pubkey_loop(self, t):
self.get_peer_pubkey()
def get_peer_pubkey(self, peer_id=None, timeout=1):
# print('get_peer_pubkey(), called..')
d = {
'c':'get_pubkey',
'd':{
'pubkey':self.dataencoder.my_text_publickey()
}
}
bd = self.dataencoder.pack('none', d, uncrypt=True)
self.udp_transport.broadcast(bd)
if peer_id is None:
# print('get_peer_pubkey():return')
return
t = t1 = time.time()
t1 += timeout
while t1 > t:
time.sleep(0.1)
t = time.time()
if self.dataencoder.exist_peer_publickeys(peer_id):
return self.dataencder.public_keys[peer_id]
raise Exception('timeout')
def comm_callback(self, data, addr):
# print('comm_callback():', data, 'addr=', addr)
d = self.dataencoder.unpack(addr[0], data)
if d is None:
# print('comm_callback(): d is None')
return
if not isinstance(d, dict):
# print('comm_callback(): d is not a dict data')
return
# print('received: data=', d)
cmd = d['c']
f = self.inner_handlers.get(cmd)
if f:
f(d, addr)
# print('comm_callback():inner callback called(),', cmd)
return
if cmd in self.block_commands:
# print('comm_callback():', cmd, 'is blocked')
return
evt_name = 'on_%s' % cmd
evt_data = {
'd': d,
'addr': addr
}
# print('udp_widget.py dispatch', evt_name, evt_data)
self.dispatch(evt_name, evt_data)
def my_event_handler(self, *args):
pass
def set_pubkey(self, data, addr):
pk = data['d']['pubkey']
id = addr[0]
# print('set_pubkey(): ', id, pk)
self.dataencoder.set_peer_text_pubkey(id, pk)
def resp_pubkey(self, data, addr):
self.set_pubkey(data, addr)
# print('resp_pubkey():', addr[0])
data = {
'c':'set_pubkey',
'd':{
'pubkey':self.dataencoder.my_text_publickey()
}
}
self.send(addr[0], data, uncrypt=True)
def broadcast(self, data):
for peer in self.dataencoder.public_keys.keys():
self.send(peer, data)
def send(self, peer_id, data, uncrypt=False):
# print('send():', peer_id, data)
d = self.dataencoder.pack(peer_id, data, uncrypt=uncrypt)
addr = (peer_id, self.udp_port)
self.udp_transport.send(d, addr)
def stop(self):
self.udp_transport.stop()