Python Twisted:如何在UDP协议中使用HTB速率限制

Question

我有一个DNS服务器，我想在它上添加一些速率限制，因为我收到了一些突发的查询。

我通读了https://github.com/racker/python-twisted-core/blob/master/doc/examples/shaper.py，并根据我的需要对其进行了调整：

from twisted.internet import reactor, protocol
from twisted.protocols import htb

udpBucket = htb.Bucket()
udpBucket.maxburst = 100000 # 1000 kb/s
udpBucket.rate     = 100000 # 1000 kb/s thereafter 

udpFilter = htb.HierarchicalBucketFilter()
udpFilter.buckets[None] = udpBucket

class DNSClientBucket(htb.Bucket):
  maxburst = 10000 # 10 kb/s
  rate     =  1000 #  1 kb/s thereafter

udpFilter2 = htb.FilterByHost(udpFilter)
udpFilter2.bucketFactory = DNSClientBucket

class DnsUdpProtocol(protocol.Protocol):
  def datagramReceived(self, data, client):
    print(data)

dns_udp_protocol = DnsUdpProtocol()
dns_udp_protocol = htb.ShapedProtocolFactory(dns_udp_protocol, udpFilter2)

dns_udp_interface   = socket.gethostbyname(socket.gethostname())
dns_udp_server_port = 53
reactor.listenUDP(port=dns_udp_server_port, protocol=dns_udp_protocol, interface=dns_udp_interface)

但我得到了以下异常：

Traceback (most recent call last):
  File "server.py", line 263, in <module>
    reactor.listenUDP(port=dns_udp_server_port, protocol=dns_udp_protocol, interface=dns_udp_interface)
  File "/usr/lib/python3.7/site-packages/twisted/internet/posixbase.py", line 369, in listenUDP
    p.startListening()
  File "/usr/lib/python3.7/site-packages/twisted/internet/udp.py", line 179, in startListening
    self._connectToProtocol()
  File "/usr/lib/python3.7/site-packages/twisted/internet/udp.py", line 217, in _connectToProtocol
    self.protocol.makeConnection(self)
AttributeError: 'ShapedProtocolFactory' object has no attribute 'makeConnection'

有没有可能将twisted.protocols.htb与UDP协议一起使用？

Answer 1

可能不会。Twisted中的HTB是面向流的套接字，而不是像UDP这样的面向数据报的套接字。

此外，Twisted中的HTB可能是相当粗略的，即使是为了它的预期目的。