[英]Python Queue.Queue wont work in threaded TCP Stream Handler
我正在嘗試創建一個線程化的 tcp 流處理程序類線程和主線程交談,但是 Queue.Queue 也沒有做我需要的事情,服務器從另一個程序接收數據,我只想將它傳遞到主線程這里處理的線程是我到目前為止的代碼:
編輯:使用建議的答案更新,隊列仍然什么都不做,我什至無法在我執行 self.queue.put(info) 之后讓任何打印命令工作,就像整個事情都死了一樣。 但是它沒有給我任何錯誤,但是在我將信息放入隊列后,數據進入的流處理程序/線程死亡。
class ThreadedTCPStreamHandler(SocketServer.StreamRequestHandler):
def __init__(self, request, client_address, server):
SocketServer.StreamRequestHandler.__init__(self, request, client_address, server)
self.queue = self.server.queue
def handle(self):
while True:
try:
self.data = self.rfile.readline().strip()
cur_thread = threading.current_thread()
command = self.data[0:2]
if command == "nr":
info = self.data[2:]
t1 = info.split("|")
title = t1[0]
self.queue.put(info)
class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True, queue=None):
self.queue = queue
SocketServer.TCPServer.__init__(self, server_address, RequestHandlerClass, bind_and_activate=bind_and_activate)
在主線程類中,我有:
q = Queue.Queue()
server = ThreadedTCPServer((HOST, PORT), ThreadedTCPStreamHandler, queue=q)
ip, port = server.server_address
server_thread = threading.Thread(target=server.serve_forever)
server_thread.daemon = True
server_thread.start()
while True:
try:
item = q.get()
print item
q.task_done()
q.join()
except KeyboardInterrupt:
server.shutdown()
sys.exit(0)
但是沒有打印出來,它不會傳遞數據,我知道我做錯了什么,我只是不知道它是什么。 如果有人有任何可以幫助的見解,我將不勝感激,謝謝。
流處理程序和主線程都需要使用相同的Queue
對象才能工作。 您正在每個地方創建單獨的隊列對象。 如果客戶端和服務器代碼在同一個文件中,或者使用queue
作為全局變量,或者執行以下操作:
class ThreadedTCPStreamServer(ThreadingMixin, TCPServer):
def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True,
queue=None):
self.queue = queue
TCPServer.__init__(self, server_address, RequestHandlerClass,
bind_and_activate=bind_and_activate)
class ThreadedTCPStreamHandler(SocketServer.StreamRequestHandler):
def __init__(self, request, client_address, server):
self.queue = server.queue
StreamRequestHandler.__init__(self, request, client_address, server)
def handle(self):
while True:
self.data = self.rfile.readline().strip()
if not self.data:
break
cur_thread = threading.current_thread()
command = self.data[0:2]
if command == "nr":
info = self.data[2:]
t1 = info.split("|")
title = t1[0]
self.queue.put(info)
self.finish()
q = Queue.Queue()
server = ThreadedTCPServer((HOST, PORT), ThreadedTCPStreamHandler, queue=q)
ip, port = server.server_address
server_thread = threading.Thread(target=server.serve_forever)
server_thread.daemon = True
server_thread.start()
while True:
try:
item = q.get()
print item
q.task_done()
q.join()
except KeyboardInterrupt:
server.shutdown()
sys.exit(0)
發現我必須從接受的答案中調整一些東西。 這個例子有效(至少在 python2.7 中)。
啟動服務器后,您可以通過使用 netcat 或類似工具重復發送來進行測試:
echo "nrtest" | nc -4 127.0.0.1 50514
也可以在 linux 上使用logger
命令發送,但是處理程序必須查找其他字符串(此示例檢查該行以“nr”開頭,作為 pr OP 請求)。
logger -T -n 127.0.0.1 -P 50514 "Test message"
結果如下 - 為可讀性分成幾個部分。
進口:
"""
Based on https://stackoverflow.com/a/25246157/2045924
"""
import threading
import Queue
import sys
import SocketServer
from SocketServer import StreamRequestHandler
from SocketServer import TCPServer
from SocketServer import ThreadingMixIn
向 TCPServer 添加隊列:
class ThreadedTCPStreamServer(ThreadingMixIn, TCPServer):
"""ThreadedTCPStreamServer."""
def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True,
queue=None):
self.queue = queue
TCPServer.__init__(self, server_address, RequestHandlerClass,
bind_and_activate=bind_and_activate)
將隊列添加到 StreamRequestHandler,告訴“處理”要做什么,讓“完成”通過。
class ThreadedTCPStreamHandler(SocketServer.StreamRequestHandler):
"""ThreadedTCPStreamHandler."""
def __init__(self, request, client_address, server):
self.queue = server.queue
StreamRequestHandler.__init__(self, request, client_address, server)
def handle(self):
while True:
self.data = self.rfile.readline().strip()
if not self.data:
break
__cur_thread = threading.current_thread()
self.finish()
command = self.data[0:2]
if command == "nr":
info = self.data[2:]
__t1 = info.split("|")
__title = __t1[0]
self.queue.put(info)
self.finish()
def finish(self):
pass
定義全局變量並開始。
HOST = '127.0.0.1'
PORT = 50514
# QUEUE must be defined _outside_.
QUEUE = Queue.Queue()
QTIMEOUT = 1
# Setup instance of my own ThreadedTCPStreamServer with my own ThreadedTCPStreamHandler.
SERVER = ThreadedTCPStreamServer((HOST, PORT), ThreadedTCPStreamHandler, queue=QUEUE)
__IP, __PORT = SERVER.server_address
# Start the server
SERVER_THREAD = threading.Thread(target=SERVER.serve_forever)
SERVER_THREAD.daemon = True
SERVER_THREAD.start()
while True:
try:
#ITEM = QUEUE.get(block=True, timeout=QTIMEOUT)
ITEM = QUEUE.get()
print 'qsize({s}): {i}'.format(s=QUEUE.qsize(), i=ITEM)
QUEUE.task_done()
QUEUE.join()
except KeyboardInterrupt:
SERVER.shutdown()
sys.exit(0)
#except Queue.Empty:
# print 'Got Queue.Empty after waiting for {t}. Continuing...'.format(t=QTIMEOUT)
# continue
現在開始使用nc
或類似工具發送一些東西。
要結束程序,請按<ctrl>+C
。
如果您發送數據包, KeyboardInterrupt
將“工作”。
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