具有多个事件的Python队列

我正试图编写一个小程序，通过HTTP接口发送和接收UDP通信以及接收命令。HTTP服务器位于一个

多处理进程中；UDP服务器位于另一个服务器中。这两个进程通过python
多处理.Pipe进行通信。我在下面附上了完整的代码

我有两个相关问题：


如何使用python中的kqueue处理多个文件描述符/kevent（套接字文件描述符工作，管道文件描述符似乎不工作-不确定我使用的管道是否等效于一个文件）
如何区分这些Kevent，以便在读取管道和插座时应用不同的功能

我希望UDP服务器执行的操作的伪代码：

kq = new kqueue
udpEvent = kevent when socket read
pipeEvent = kevent when pipe read
while:
    for event in kq.conrol([udpEvent, pipeEvent]):
        if event == udpEvent:
             # do something
        elif event == pipeEvent:
             print "HTTP command via pipe:", pipe.recv()

现在，UDP服务器识别套接字事件并正确读取套接字。但是，当我将pipekevent添加到kqueue时，程序会不停地吐出pipeevents。我将过滤器设置为已编写管道，但我假设1）这是错误的2）更具体地说，python
multiprocessing.pipe类似于常规unix管道，需要以不同的方式处理

.....
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>
<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 ^C<select.kevent ident=4297866384 filter=-29216 flags=0x4000 fflags=0x1 data=0x16 udata=0x4000000000000>

server.py（UDP）

handler.py（HTTP接口）


更新：

我用select重写了server listen方法。对于使用不超过3或4个FD的速度较慢的小型python原型，速度并不重要。Kqueue将是另一天的主题

def侦听（自身、IP地址、端口）：
打印“开始！”

我知道这是一个老问题，但我可以给你一个我在多线程HTTP服务器上使用的kqueue套接字轮询的例子，我在阅读了C源代码和kqueue的手册页后发现了这个例子

#bsd socket polling
#I make all the relevant flags more C like to match the kqueue man pages
from select import kevent, kqueue
from select import KQ_EV_ADD as EV_ADD, KQ_EV_ONESHOT as EV_ONESHOT   
from select import KQ_EV_EOF as EV_EOF

from .common import Client_Thread #a parent class who's implementation is irrelevant to the question, lol

class BSD_Client(Client_Thread):
    def __init__(self, *args):
        Client_Thread.__init__(self, *args)
        #Make a kqueue object for the thread 
        kq = kqueue()
        #Make a one-shot kev for this kqueue for when the kill socket is
        #connected to. The connection is only made once, so why not tell
        #that to our kqueue? The default filter is EVFILT_READ, so we don't
        #need to specify that. The default flag is just EV_ADD.
        kill_kev = kevent(self.kill_fd, flags=EV_ADD|EV_ONESHOT)
        #using defaults for the client socket.
        client_kev = kevent(self.client_sock)
        #we only need to keep track of the kqueue's control func.
        #This also makes things prettier in the run func.
        self.control = kq.control
        #now, we add thel list of events we just made to our kqueue.
        #The first 0 means we want a list of at most 0 length in return.
        #the second 0 means we want no timeout (i.e. do this in a 
        #non-blocking way.) 
        self.control([client_kev, kill_kev], 0, 0)

    def run(self):
        while True:
            #Here we poll the kqueue object.
            #The empty list means we are adding no new events to the kqueue.
            #The one means we want a list of at most 1 element. Then None
            #Means we want block until an event is triggered.
            events = self.control([], 1, None)
            #If we have an event, and the event is for the kill socket 
            #(meaning somebody made a connection to it), then we break the 
            #loop and die.
            if events and events[0].ident == self.kill_fd:
                self.die()
                break
            #If all that is left is an EOF in our socket, then we break
            #the loop and die. Kqueues will keep returning a kevent
            #that has been read once, even when they are empty.
            if events and events[0].flags & EV_EOF:
                self.die()
                break
            #Finally, if we have an event that isn't for the kill socket and
            #does not have the EOF flag set, then there is work to do. If
            #the handle client function (defined in the parent class) returns
            #1, then we are done serving a page and we can die.
            if events and self.handle_client():
                self.die()
                break
        client.close()

self.die所做的就是将客户机ip:port字符串放入用于消息传递的队列中。另一个线程从队列中获取该字符串，打印一条消息并加入相关的线程对象。当然，我没有使用管道，只有插座。但我确实在kqueue的联机手册页上找到了这个

先进先出，管道

当有数据要读取时返回；数据包含的编号为

字节可用



当最后一个写入程序断开连接时，过滤器将在

旗帜。这可以通过进入EV_CLEAR来清除，此时

过滤器将继续等待数据变为可用，然后再重新启动

转向

因此，也许在udp服务器中，您可以在revents列表中循环，您应该按照手册页所说的做？实际上，你甚至不需要循环浏览一个最长的列表。也许你的监听功能应该是这样的

def listen(self, ip, port):
    print "Starting!"
    sock = socket.socket(AF_INET, SOCK_DGRAM)
    sock.bind((ip, port))
    kq = select.kqueue()
    kev0 = select.kevent(sock)
    kev1 = select.kevent(self.pipe)
    kq.control([kev0, kev1], 0, 0)
    while True: #this loop never breaks! so this whole function blocks forever like this
        revents = kq.control([], 1, None)
        if revents:
            event = revents[0]
            if event.flags & select.KQ_EV_EOF:
                new_event = select.kevent(event.ident, flags=select.KQ_EV_CLEAR)
                kq.control([new_event], 0, 0)
            else:
                print event

我真的建议像我这样导入标志和函数，这会使它更类似于基于C的手册页，你将不得不比较，我认为它看起来更漂亮。
我还想指出，我的类与您的类有点不同，因为每个新客户机都将获得该类的一个实例，并且每个实例都将在自己的线程中运行。
这不是真正的答案，但是：您希望管道过滤器是“管道可读”，而不是“管道可写”。但是您还需要设置管道非阻塞并收集部分输入，我现在不知道如何做到这一点。另外，
revents=kq.control（[kevent0，kevent1]，1，None）
味道不好：通常，您只需为每个fd添加一个控件（以及删除一个控件以删除fd，尽管它们在关闭时会自动清理），然后执行
kcontrol（None，
）读取事件。此调用位于循环内，正在重新添加。但是，我也没有仔细研究过这些。是的，我试着找到了一些例子，但是没有看到python的任何东西，并且一天都不忍心进入C模式。所以我用select（参见更新）在3分钟内重写了它，它工作得很好，对于python原型来说已经足够好了。
import BaseHTTPServer

# Simple HTTP endpoints for controlling prototype Phantom implementation.
# The following commands are supported:
# 1. Open a connection via /open/[IP]:[PORT]
# 2. ????

class RequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
    pipe = None

    def __init__(self, pipe, *args):
        RequestHandler.pipe = pipe
        BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args)

    def do_HEAD(s):
        s.send_response(200)
        s.send_header("Content-type", "application/json")
        s.end_headers()
    def do_GET(s):
        s.send_response(200)
        s.send_header("Content-type", "application/json")
        s.end_headers()

        # Open connection command
        if s.path.startswith('/open/'):
            addrStr = s.path[6:len(s.path)]
            (address, port) = tuple(filter(None, addrStr.split(':')))
            port = int(port)
            print "opening address: ", address, "port:", port
            RequestHandler.pipe.send(['open', address, port])

def handleRequestsUsing(logic):
    return lambda *args: RequestHandler(logic, *args)

# Initialize listening non-blocking UDP socket
sock = socket(AF_INET, SOCK_DGRAM)
sock.setblocking(0)
sock.bind((ipaddress, port))

inputs = [sock, self.pipe] # stuff we read
outputs = [] # stuff we expect to write
while inputs:
    readable, writable, exceptional = select.select(inputs, outputs, inputs)

    for event in readable:
        if event is sock:
            self.handleUDPData( sock.recvfrom(1024) )
        if event is self.pipe:
            print "pipe event", self.pipe.recv()

#bsd socket polling
#I make all the relevant flags more C like to match the kqueue man pages
from select import kevent, kqueue
from select import KQ_EV_ADD as EV_ADD, KQ_EV_ONESHOT as EV_ONESHOT   
from select import KQ_EV_EOF as EV_EOF

from .common import Client_Thread #a parent class who's implementation is irrelevant to the question, lol

class BSD_Client(Client_Thread):
    def __init__(self, *args):
        Client_Thread.__init__(self, *args)
        #Make a kqueue object for the thread 
        kq = kqueue()
        #Make a one-shot kev for this kqueue for when the kill socket is
        #connected to. The connection is only made once, so why not tell
        #that to our kqueue? The default filter is EVFILT_READ, so we don't
        #need to specify that. The default flag is just EV_ADD.
        kill_kev = kevent(self.kill_fd, flags=EV_ADD|EV_ONESHOT)
        #using defaults for the client socket.
        client_kev = kevent(self.client_sock)
        #we only need to keep track of the kqueue's control func.
        #This also makes things prettier in the run func.
        self.control = kq.control
        #now, we add thel list of events we just made to our kqueue.
        #The first 0 means we want a list of at most 0 length in return.
        #the second 0 means we want no timeout (i.e. do this in a 
        #non-blocking way.) 
        self.control([client_kev, kill_kev], 0, 0)

    def run(self):
        while True:
            #Here we poll the kqueue object.
            #The empty list means we are adding no new events to the kqueue.
            #The one means we want a list of at most 1 element. Then None
            #Means we want block until an event is triggered.
            events = self.control([], 1, None)
            #If we have an event, and the event is for the kill socket 
            #(meaning somebody made a connection to it), then we break the 
            #loop and die.
            if events and events[0].ident == self.kill_fd:
                self.die()
                break
            #If all that is left is an EOF in our socket, then we break
            #the loop and die. Kqueues will keep returning a kevent
            #that has been read once, even when they are empty.
            if events and events[0].flags & EV_EOF:
                self.die()
                break
            #Finally, if we have an event that isn't for the kill socket and
            #does not have the EOF flag set, then there is work to do. If
            #the handle client function (defined in the parent class) returns
            #1, then we are done serving a page and we can die.
            if events and self.handle_client():
                self.die()
                break
        client.close()

def listen(self, ip, port):
    print "Starting!"
    sock = socket.socket(AF_INET, SOCK_DGRAM)
    sock.bind((ip, port))
    kq = select.kqueue()
    kev0 = select.kevent(sock)
    kev1 = select.kevent(self.pipe)
    kq.control([kev0, kev1], 0, 0)
    while True: #this loop never breaks! so this whole function blocks forever like this
        revents = kq.control([], 1, None)
        if revents:
            event = revents[0]
            if event.flags & select.KQ_EV_EOF:
                new_event = select.kevent(event.ident, flags=select.KQ_EV_CLEAR)
                kq.control([new_event], 0, 0)
            else:
                print event