matlab用socket线程发送数据,使用Python Twisted和Autobahn从Matlab通过WebSocket发送JSON数据...
我正在尝试创建一个从Matlab到WebSocket流JSON帧的连接。我用下面的代码测试了我的python安装和twisted。在
工作实例
Matlab代码
示例驱动程序代码，它使用JSONlab工具箱将Matlab数据转换为JSON格式，然后对数据进行Icompress和Base64编码。因为我还没有让RPC工作，所以我使用命令行，我需要压缩和Base64编码来避免行长度和shell转义问题。在clear all
close all
python = '/usr/local/bin/python'
bc = '/Users/palmerc/broadcast_client.py'
i = uint32(1)
encoder = org.apache.commons.codec.binary.Base64
while true
tic;
packet = rand(100, 100);
json_packet = uint8(savejson('', packet));
compressed = CompressLib.compress(json_packet);
b64 = char(encoder.encode(compressed));
message = sprintf('%s %s %s', python, bc, b64);
status = system(message);
i = i + 1;
toc;
end
广播客户端代码
客户端代码有两种调用方式。您可以通过命令行传递消息，也可以创建BroadcastClient实例并调用sendMessage。在
^{pr2}$
广播服务器代码
服务器使用TXJSONRPC、Twisted和Autobahn在7080上提供RPC客户端，在8080上提供web客户端，在9080上提供WebSocket。Autobahn Web Client对调试很有用，应该与服务器代码放在同一个目录中。在#!/usr/bin/env python
import sys
from twisted.internet import reactor
from twisted.python import log
from twisted.web.server import Site
from twisted.web.static import File
from txjsonrpc.web import jsonrpc
from autobahn.twisted.websocket import WebSocketServerFactory, \
WebSocketServerProtocol, \
listenWS
class BroadcastServerProtocol(WebSocketServerProtocol):
def onOpen(self):
self.factory.registerClient(self)
def onMessage(self, payload, isBinary):
if not isBinary:
message = "{} from {}".format(payload.decode('utf8'), self.peer)
self.factory.broadcastMessage(message)
def connectionLost(self, reason):
WebSocketServerProtocol.connectionLost(self, reason)
self.factory.unregisterClient(self)
class BroadcastServerFactory(WebSocketServerFactory):
"""
Simple broadcast server broadcasting any message it receives to all
currently connected clients.
"""
def __init__(self, url, debug=False, debugCodePaths=False):
WebSocketServerFactory.__init__(self, url, debug=debug, debugCodePaths=debugCodePaths)
self.clients = []
def registerClient(self, client):
if client not in self.clients:
print("registered client {}".format(client.peer))
self.clients.append(client)
def unregisterClient(self, client):
if client in self.clients:
print("unregistered client {}".format(client.peer))
self.clients.remove(client)
def broadcastMessage(self, message):
print("broadcasting message '{}' ..".format(message))
for client in self.clients:
client.sendMessage(message.encode('utf8'))
print("message sent to {}".format(client.peer))
class BroadcastPreparedServerFactory(BroadcastServerFactory):
"""
Functionally same as above, but optimized broadcast using
prepareMessage and sendPreparedMessage.
"""
def broadcastMessage(self, message):
print("broadcasting prepared message '{}' ..".format(message))
preparedMessage = self.prepareMessage(message.encode('utf8'), isBinary=False)
for client in self.clients:
client.sendPreparedMessage(preparedMessage)
print("prepared message sent to {}".format(client.peer))
class MatlabClient(jsonrpc.JSONRPC):
factory = None
def jsonrpc_broadcastMessage(self, message):
if self.factory is not None:
print self.factory.broadcastMessage(message)
if __name__ == '__main__':
if len(sys.argv) > 1 and sys.argv[1] == 'debug':
log.startLogging(sys.stdout)
debug = True
else:
debug = False
factory = BroadcastPreparedServerFactory(u"ws://127.0.0.1:9000",
debug=debug,
debugCodePaths=debug)
factory.protocol = BroadcastServerProtocol
listenWS(factory)
matlab = MatlabClient()
matlab.factory = factory
reactor.listenTCP(7080, Site(matlab))
webdir = File(".")
web = Site(webdir)
reactor.listenTCP(8080, web)
reactor.run()
问题-失败的尝试
首先要注意的是，如果在Matlab中使用python有困难，那么需要确保使用pyversion命令在系统上指向正确的python版本，并且可以使用pyversion('/path/to/python')来更正它
Matlab无法运行reactorclear all
close all
i = uint32(1)
while true
tic;
packet = rand(100, 100);
json_packet = uint8(savejson('', packet));
compressed = CompressLib.compress(json_packet);
b64 = char(encoder.encode(compressed));
bc.sendMessage(py.str(b64.'));
py.twisted.internet.reactor.run % This won't work.
i = i + 1;
toc;
end
Matlab POST
另一个尝试涉及使用Matlab的webwrite来发布到服务器。结果表明，webwrite只需传递正确的weboptions，就可以将数据转换为JSON。在options = weboptions('MediaType', 'application/json');
data = struct('Matrix', rand(100, 100));
webwrite(server, data, options);
这是有效的，但结果证明每个消息都很慢(约0.1秒)。我应该提到的是，矩阵并不是我发送的真实数据，真实数据序列化为每条消息280000字节，但这提供了一个合理的近似值。在
我怎样才能调用bc.sendMessage以便它能够正确地让reactor运行，或者以另一种更快的方式解决这个问题？在