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#! /usr/bin/env python
import random
import json
import uuid
import tornado.ioloop
import tornado.tcpserver
import tornado.httpserver
import tornado.web
import netio
import imc.nonblock
from imc.proxy import Proxy,Connection,imc_call,imc_register_call
class Worker:
def __init__(self,stream,linkclass,linkid,worker_info):
global center_serv
self.stream = stream
self.linkclass = linkclass
self.linkid = linkid
self.sock_addr = (worker_info['sock_ip'],worker_info['sock_port'])
netio.send_pack(self.stream,bytes(json.dumps({
'linkid':self.linkid,
'center_linkid':center_serv.linkid
}),'utf-8'))
conn = netio.SocketConnection(self.linkid,self.stream)
conn.add_close_callback(lambda conn : self.close())
Proxy.instance.add_conn(conn)
def close(self):
pass
class BackendWorker(Worker):
def __init__(self,stream,linkid,worker_info):
global center_serv
super().__init__(stream,'backend',linkid,worker_info)
self.ws_addr = (worker_info['ws_ip'],worker_info['ws_port'])
center_serv.add_backend_worker(self)
def add_client(self,client_linkid):
return self.ws_addr
def close(self):
global center_serv
center_serv.del_backend_worker(self)
print('disconnect')
class CenterServer(tornado.tcpserver.TCPServer):
def __init__(self):
super().__init__()
self._linkid_usemap = {}
self._worker_linkidmap = {}
self._client_linkidmap = {}
self._backend_workerlist = []
self.linkclass = 'center'
self.linkid = self._create_linkid()
Proxy(self.linkid)
print('/center/' + self.linkid)
imc_register_call('','lookup_linkid',self._lookup_linkid)
imc_register_call('','add_client',self._add_client)
imc_register_call('','del_client',self._del_client)
imc_register_call('','test_dst',self._test_dst)
imc_register_call('','test_dstb',self._test_dstb)
def handle_stream(self,stream,address):
def _recv_worker_info(data):
worker_info = json.loads(data.decode('utf-8'))
linkclass = worker_info['linkclass']
if linkclass == 'backend':
linkid = self._create_linkid()
worker = BackendWorker(stream,linkid,worker_info)
netio.recv_pack(stream,_recv_worker_info)
def add_backend_worker(self,worker):
self._worker_linkidmap[worker.linkid] = worker
self._backend_workerlist.append(worker)
def del_backend_worker(self,worker):
self._worker_linkidmap.pop(worker.linkid,None)
self._backend_workerlist.remove(worker)
def add_client(self):
size = len(self._backend_workerlist)
if size == 0:
return None
linkid = self._create_linkid()
worker = self._backend_workerlist[random.randrange(size)]
ws_ip,ws_port = worker.add_client(linkid)
return (linkid,worker.linkid,ws_ip,ws_port)
def _create_linkid(self):
linkid = uuid.uuid4()
while linkid in self._linkid_usemap:
linkid = uuid.uuid4()
linkid = str(linkid)
self._linkid_usemap[linkid] = True
linkid = str(len(self._linkid_usemap))
return linkid
@imc.nonblock.func
def _lookup_linkid(self,iden,param):
linkid = param
try:
worker = self._worker_linkidmap[linkid]
if iden['linkclass'] != 'client':
sock_ip,sock_port = worker.sock_addr
return {'worker_linkid':worker.linkid,'sock_ip':sock_ip,'sock_port':sock_port}
except KeyError:
return None
@imc.nonblock.func
def _add_client(self,iden,param):
worker_linkid = param['worker_linkid']
client_linkid = param['client_linkid']
self._client_linkidmap[client_linkid] = True
conn = Proxy.instance.get_conn(worker_linkid)
Proxy.instance.link_conn(client_linkid,conn)
@imc.nonblock.func
def _del_client(self,iden,param):
client_linkid = param
del self._client_linkidmap[client_linkid]
conn = Proxy.instance.get_conn(client_linkid)
Proxy.instance.unlink_conn(client_linkid)
@imc.nonblock.func
def _test_dst(self,iden,param):
#stat,ret = (yield imc_call(
# {'linkclass':'center','linkid':self.linkid},
# '/center/' + self.linkid + '/',
# 'test_dstb',
# 'Hello X'
#))
linkidlist = []
linkids = self._client_linkidmap.keys()
for linkid in linkids:
linkidlist.append(linkid)
return linkidlist
@imc.nonblock.func
def _test_dstb(self,iden,param):
return param + ' World'
class WebConnHandler(tornado.web.RequestHandler):
def set_default_headers(self):
self.set_header('Access-Control-Allow-Origin','*')
def post(self):
global center_serv
data = center_serv.add_client()
if data == None:
self.write('Eno_backend')
else:
client_linkid,worker_linkid,ip,port = data
self.write(json.dumps({
'client_linkid':client_linkid,
'worker_linkid':worker_linkid,
'ip':ip,
'port':port
}))
if __name__ == '__main__':
global center_serv
center_serv = CenterServer()
center_serv.listen(5730)
http_serv = tornado.httpserver.HTTPServer(tornado.web.Application([
('/conn',WebConnHandler),
]))
http_serv.listen(83)
tornado.ioloop.IOLoop.instance().start()
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