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editor_rpc.py
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editor_rpc.py
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import enum
import json
import os
import queue
import select
import socket
import struct
import threading
import traceback
import xmlrpc.client as xmlrpclib
from xml.sax.saxutils import escape
from talon import rctx
class opaque(object):
def __init__(self, s):
self.desc = s
def __repr__(self):
return self.desc
@staticmethod
def load(marshall, s):
marshall.append(opaque(s))
marshall.type = 'opaque'
marshall._value = 0
@staticmethod
def dump(marshall, value, append):
append('<value><opaque>%s</opaque></value>' % escape(value.desc))
xmlrpclib.Unmarshaller.dispatch['opaque'] = opaque.load
xmlrpclib.Marshaller.dispatch[opaque] = opaque.dump
def xml_loads(data):
p, u = xmlrpclib.getparser()
p.feed(data)
p.close()
return u.close()
class NotConnected(Exception): pass
class ClientTransport(xmlrpclib.Transport):
def __init__(self, s):
self.buf = b''
self.s = s
self.q = queue.Queue()
self.need = -1
self.msg_type = -1
self.lock = threading.Lock()
xmlrpclib.Transport.__init__(self)
def recv_size(self, n):
while len(self.buf) < n:
data = self.s.recv(1024)
if not data:
raise socket.error
self.buf += data
out = self.buf[:n]
self.buf = self.buf[n:]
return out
def recv_data(self):
data = self.s.recv(4096)
if not data:
raise socket.error('end of file')
self.buf += data
def _enough(self):
return (self.need == -1 and len(self.buf) >= 5
or self.need >= 0 and len(self.buf) >= self.need)
def on_data(self):
self.recv_data()
out = []
while self._enough():
if self.need == -1:
self.msg_type, self.need, = struct.unpack('>BI', self.buf[:5])
self.buf = self.buf[5:]
else:
data = self.buf[:self.need]
self.buf = self.buf[self.need:]
if self.msg_type == 0:
self.q.put(data)
elif self.msg_type == 1:
out.append(json.loads(data.decode('utf8')))
self.need = -1
return out
def recv(self):
return self.q.get()
def send(self, body):
self.s.send(struct.pack('>I', len(body)))
self.s.send(body)
def close(self):
try: self.s.shutdown(socket.SHUT_RDWR)
except: pass
try: self.s.close()
except: pass
self.q.put(None)
def single_request(self, host, handler, body, verbose=0):
with self.lock:
try:
self.send(body)
data = self.recv()
except socket.error as e:
self.close()
raise
return xml_loads(data)
class Client(xmlrpclib.ServerProxy):
def __init__(self, s):
self._active = False
self._transport = ClientTransport(s)
xmlrpclib.ServerProxy.__init__(self, 'http://.', transport=self._transport, allow_none=True)
def _close(self):
self._transport.close()
def __bool__(self):
return self._active
def __repr__(self):
return '<Client {:#x}>'.format(id(self))
__str__ = __repr__
class Server(object):
def __init__(self):
self.callbacks = set()
self.clients = {}
self.cb = queue.Queue()
def client(self):
if len(self.clients) > 1:
raise RuntimeError("Multiple connected editors, this shouldn't happen")
for k,v in self.clients.items():
return v
return None
def detach(self, client):
print('detached {}'.format(client))
client._close()
if client == self.client:
self.client = None
del self.clients[client._transport.s]
def register(self, cb):
self.callbacks.add(cb)
rctx.register(lambda: self.callbacks.remove(cb))
def emit(self, client, msg):
cmd = msg.pop('cmd', None)
print('emit', client, cmd, msg)
# if cmd == 'active':
# if msg.get('active'):
# if self.client:
# self.client._active = False
# self.client = client
# client._active = True
# elif self.client == client:
# client._active = False
for cb in self.callbacks:
self.cb.put((cb, (client, cmd, msg)))
def cb_thread(self):
while True:
cb, args = self.cb.get()
try:
cb(*args)
except Exception:
traceback.print_exc()
def serve(self, path):
server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if os.path.exists(path):
os.unlink(path)
server.bind(path)
server.listen(1)
while True:
sockets = list(self.clients.keys()) + [server]
ready, _, errors = select.select(sockets, [], sockets, 0.5)
for s in ready:
client = None
if s == server:
sock, addr = server.accept()
client = Client(sock)
print('accepted new connection: {}'.format(client))
try:
self.clients[sock] = client
except Exception:
traceback.print_exc()
else:
try:
client = self.clients[s]
result = client._transport.on_data()
try:
for msg in result:
self.emit(client, msg)
except Exception:
traceback.print_exc()
except socket.error:
self.detach(client)
except Exception:
traceback.print_exc()
self.detach(client)
def spawn(self, path):
t = threading.Thread(target=self.serve, args=(path, ))
t.daemon = True
t.start()
t = threading.Thread(target=self.cb_thread)
t.daemon = True
t.start()
server = Server()
server.spawn('/tmp/talon_editor_socket')
register = server.register
def active(): return server.client()
# def clients(): return list(server.clients.values())