【发布时间】：2016-12-15 08:37:39
【问题描述】：
我创建了 Tornado 服务器，它接受 python 和 matlab 代码并执行它。这是服务器代码。
from zmq.eventloop.zmqstream import ZMQStream
from zmq.eventloop import ioloop
ioloop.install()
from functools import partial
from tornado import web, gen, escape
from tornado import options, httpserver
from tornado.concurrent import Future
settings = dict()
settings['autoreload'] = True
settings['debug'] = True
from jupyter_client import MultiKernelManager
reply_futures = {}
kids = []
class MainHandler(web.RequestHandler):
def get(self):
self.write("Hello")
class ExecuteHandler(web.RequestHandler):
def get(self):
self.write("approaching execute")
def post(self):
data = escape.json_decode(self.request.body)
print data
self.application.execute_code(data)
class Application(web.Application):
def __init__(self):
handlers = []
handlers.append((r"/", MainHandler))
handlers.append((r"/execute", ExecuteHandler))
web.Application.__init__(self, handlers, **settings)
self.km = MultiKernelManager()
self.setup_kernels()
def setup_kernels(self):
matlab_kernel_id = self.km.start_kernel(kernel_name="matlab")
python_kernel_id = self.km.start_kernel(kernel_name="python")
self.matlab_kernel_id = matlab_kernel_id
self.python_kernel_id = python_kernel_id
matkab_kernel_client = self.km.get_kernel(matlab_kernel_id).client()
matkab_kernel_client.start_channels()
python_kernel_client = self.km.get_kernel(python_kernel_id).client()
python_kernel_client.start_channels()
self.matkab_kernel_client = matkab_kernel_client
self.python_kernel_client = python_kernel_client
matlab_iopub_stream = ZMQStream(matkab_kernel_client.iopub_channel.socket)
matlab_shell_stream = ZMQStream(matkab_kernel_client.shell_channel.socket)
python_iopub_stream = ZMQStream(python_kernel_client.iopub_channel.socket)
python_shell_stream = ZMQStream(python_kernel_client.shell_channel.socket)
matlab_iopub_stream.on_recv_stream(partial(self.reply_callback, matkab_kernel_client.session))
matlab_shell_stream.on_recv_stream(partial(self.reply_callback, matkab_kernel_client.session))
python_iopub_stream.on_recv_stream(partial(self.reply_callback, python_kernel_client.session))
python_shell_stream.on_recv_stream(partial(self.reply_callback, python_kernel_client.session))
def reply_callback(self, session, stream, msg_list):
idents, msg_parts = session.feed_identities(msg_list)
reply = session.deserialize(msg_parts)
if "stream" == reply["msg_type"]:
print reply["content"]["text"]
parent_id = reply['parent_header'].get('msg_id')
reply_future = reply_futures.get(parent_id)
if reply_future:
reply_future.set_result(reply)
def execute_code(self, data):
matlab_code = data['matlab_code']
python_code = data['python_code']
self.execute_matlab_then_python(matlab_code, python_code)
@gen.coroutine
def execute_matlab_then_python(self, matlab_code, python_code):
print "executing matlab code"
parent_id1 = self.matkab_kernel_client.execute(matlab_code)
f1 = reply_futures[parent_id1] = Future()
yield f1
print "executing python code"
parent_id2 = self.python_kernel_client.execute(python_code)
f2 = reply_futures[parent_id2] = Future()
yield f2
def shutdown_kernels(self):
self.km.get_kernel(self.matlab_kernel_id).cleanup_connection_file()
self.km.shutdown_kernel(self.matlab_kernel_id)
self.km.get_kernel(self.python_kernel_id).cleanup_connection_file()
self.km.shutdown_kernel(self.python_kernel_id)
if __name__ == '__main__':
options.parse_command_line()
app = Application()
server = httpserver.HTTPServer(app)
server.listen(8888)
try:
ioloop.IOLoop.current().start()
except KeyboardInterrupt:
print 'going down'
finally:
app.shutdown_kernels()
我用来访问的客户端代码在这里
import json
import requests
matlab_code = "a=magic(3);disp(a)"
python_code = "print 'Hello World!!'"
data = {}
data['matlab_code'] = matlab_code
data['python_code'] = python_code
r = requests.post('http://0.0.0.0:8888/execute', json.dumps(data))
我关心的是保持执行顺序，这样 python 代码只有在 matlab 完成后才会执行。我正在使用 jupyter_client 执行 matlab/python 代码。我在这里使用python27。问题是当我提交代码时它会抛出TypeError: 'NoneType' object is not iterable。这是它的堆栈跟踪。
我不明白这里有什么问题？
【问题讨论】：
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标签： python asynchronous tornado jupyter coroutine