本文實例講述了Python提示[Errno 32]Broken pipe導致線程crash錯誤解決方法。分享給大家供大家參考。具體方法如下：
1. 錯誤現象
ThreadingHTTPServer 實現的 http 服務，如果客戶端在服務器返回前，主動斷開連接，則服務器端會報 [Errno 32] Broken pipe 錯，并導致處理線程 crash.
下面先看個例子,python 版本: 2.7
示例代碼
#!coding=utf-8
?
import os
import time
import socket
import threading
from BaseHTTPServer import HTTPServer ,BaseHTTPRequestHandler
from SocketServer import ThreadingMixIn
?
class RequestHandler(BaseHTTPRequestHandler):
??? def do_GET(self):
??????? """
??????? 處理get請求
??????? """??????
??????? query=self.path
??????? print "query: %s thread=%s" % (query, str(threading.current_thread()))
????????
??????? #ret_str="" + self.path + "
" + str(self.server) + "
" + str(self.responses) +? ""
??????? ret_str="" + self.path + "
" + str(self.server) +? ""
????????
??????? time.sleep(5)
????????
??????? try:
??????????? self.send_response(200)
??????????? self.send_header('Content-type','text/html')
??????????? self.end_headers()
??????????? self.wfile.write(ret_str)
??????? except socket.error, e:
??????????? print "socket.error : Connection broke. Aborting" + str(e)
??????????? self.wfile._sock.close()? # close socket
??????????? self.wfile._sock=None
??????????? return False
???????
??????? print "success prod query :%s" % (query)
??????? return True
?
#多線程處理
class ThreadingHTTPServer(ThreadingMixIn,HTTPServer):
??? pass
????
if __name__ == '__main__':
??? serveraddr = ('',9001)
?
??? ser = ThreadingHTTPServer(serveraddr,RequestHandler)
??? ser.serve_forever()
??? sys.exit(0)
運行服務
./thread_http_server_error.py
第1次 curl ，等待返回
/hello1
<__main__.ThreadingHTTPServer instance at 0x37483b0>[~]$
此時服務器端輸出日志如下：
$./thread_http_server_error.py
query: /hello1 thread=
search041142.sqa.cm4.tbsite.net ?C - [15/May/2014 15:02:27] “GET /hello1 HTTP/1.1″ 200 -
success prod query :/hello1
?第2次 curl ，不等待返回，ctrl +C 來模擬客戶端斷開
[~]$ ctrl+C
此時服務器端輸出日志如下：
search041142.sqa.cm4.tbsite.net ?C - [15/May/2014 15:33:10] “GET /hello2 HTTP/1.1″ 200 -
socket.error : Connection broke. Aborting[Errno 32] Broken pipe
―――――――――――――-
Exception happened during processing of request from ('10.232.41.142′, 48769)
Traceback (most recent call last):
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/SocketServer.py”, line 582, in process_request_thread
self.finish_request(request, client_address)
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/SocketServer.py”, line 323, in finish_request
self.RequestHandlerClass(request, client_address, self)
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/SocketServer.py”, line 639, in __init__
self.handle()
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/BaseHTTPServer.py”, line 337, in handle
self.handle_one_request()
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/BaseHTTPServer.py”, line 326, in handle_one_request
?self.wfile.flush() #actually send the response if not already done.
File “/home/wuzhu/tools/python_2_7_1/lib/python2.7/socket.py”, line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
AttributeError: 'NoneType' object has no attribute 'sendall'
2. 原因分析
“[Errno 32] Broken pipe “ 產生的原因還是比較明確的，由于 client 在服務器返回前主動斷開連接，所以服務器在返回時寫 socket 收到SIGPIPE報錯。雖然在我們的程序中也對異常進行了處理，將handler 的 wfile._sock 對象close 掉 ，但python 的庫里BaseHTTPServer.py中BaseHTTPRequestHandler 類的成員函數handle_one_request還是會直接調用 wfile.flush ，而沒有判斷 wfile 是否已經 close。
??? """Handle a single HTTP request.
?
??? You normally don't need to override this method; see the class
??? __doc__ string for information on how to handle specific HTTP
??? commands such as GET and POST.
?
??? """
??? try:
??????? self.raw_requestline = self.rfile.readline(65537)
??????? if len(self.raw_requestline) > 65536:
??????????? self.requestline = ''
??????????? self.request_version = ''
??????????? self.command = ''
??????????? self.send_error(414)
??????????? return
??????? if not self.raw_requestline:
??????????? self.close_connection = 1
??????????? return
??????? if not self.parse_request():
??????????? # An error code has been sent, just exit
??????????? return
??????? mname = 'do_' + self.command
??????? if not hasattr(self, mname):
??????????? self.send_error(501, "Unsupported method (%r)" % self.command)
??????????? return
??????? method = getattr(self, mname)
??????? method()
??????? #沒有判斷 wfile 是否已經 close 就直接調用 flush()
??????? self.wfile.flush() #actually send the response if not already done.
??? except socket.timeout, e:
??????? #a read or a write timed out.? Discard this connection
??????? self.log_error("Request timed out: %r", e)
??????? self.close_connection = 1
??????? return
3. 解決辦法
只要在RequestHandler重載其基類BaseHTTPRequestHandler的成員函數handle_one_reques（），在調用 wfile.flush() 前加上 wfile 是否已經 close 即可。
#!coding=utf-8
import os
import time
import socket
import threading
from BaseHTTPServer import HTTPServer ,BaseHTTPRequestHandler
from SocketServer import ThreadingMixIn
class RequestHandler(BaseHTTPRequestHandler):
????
??? def handle_one_request(self):
??????? """Handle a single HTTP request.
?
??????? You normally don't need to override this method; see the class
??????? __doc__ string for information on how to handle specific HTTP
??????? commands such as GET and POST.
?
??????? """
??????? try:
??????????? self.raw_requestline = self.rfile.readline(65537)
??????????? if len(self.raw_requestline) > 65536:
??????????????? self.requestline = ''
??????????????? self.request_version = ''
??????????????? self.command = ''
??????????????? self.send_error(414)
??????????????? return
??????????? if not self.raw_requestline:
??????????????? self.close_connection = 1
??????????????? return
??????????? if not self.parse_request():
??????????????? # An error code has been sent, just exit
??????????????? return
??????????? mname = 'do_' + self.command
??????????? if not hasattr(self, mname):
??????????????? self.send_error(501, "Unsupported method (%r)" % self.command)
??????????????? return
??????????? method = getattr(self, mname)
??????????? print "before call do_Get"
??????????? method()
??????????? #增加 debug info 及 wfile 判斷是否已經 close
??????????? print "after call do_Get"
??????????? if not self.wfile.closed:
??????????????? self.wfile.flush() #actually send the response if not already done.
??????????? print "after wfile.flush()"
??????? except socket.timeout, e:
??????????? #a read or a write timed out.? Discard this connection
??????????? self.log_error("Request timed out: %r", e)
??????????? self.close_connection = 1
??????????? return
????
??? def do_GET(self):
??????? """
??????? 處理get請求
??????? """
??????? query=self.path
??????? print "query: %s thread=%s" % (query, str(threading.current_thread()))
?
??????? ret_str="" + self.path + "
" + str(self.server) +? ""
?
??????? time.sleep(5)
????????
??????? try:
??????????? self.send_response(200)
??????????? self.send_header('Content-type','text/html')
??????????? self.end_headers()?????????
??????????? self.wfile.write(ret_str)
??????? except socket.error, e:
??????????? print "socket.error : Connection broke. Aborting" + str(e)
??????????? self.wfile._sock.close()
??????????? self.wfile._sock=None
??????????? return False
???????
??????? print "success prod query :%s" % (query)
??????? return True
?
#多線程處理
class ThreadingHTTPServer(ThreadingMixIn,HTTPServer):
??? pass
????
if __name__ == '__main__':
??? serveraddr = ('',9001)
?
??? ser = ThreadingHTTPServer(serveraddr,RequestHandler)
??? ser.serve_forever()
??? sys.exit(0)
運行服務
./thread_http_server.py
curl ，不等待返回，ctrl +C 來模擬客戶端斷開
[~]$ ctrl+C
此時服務器端輸出日志如下：
query: /hello2 thread=
search041142.sqa.cm4.tbsite.net - - [15/May/2014 15:54:09] "GET /hello2 HTTP/1.1" 200 -
socket.error : Connection broke. Aborting[Errno 32] Broken pipe
after call do_Get
after wfile.flush()
希望本文所述對大家的Python程序設計有所幫助。
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