成功运行几个小时后，我收到以下错误。
Traceback (most recent call last):
File "/usr/lib/python2.6/threading.py", line 484, in run
self.__target(*self.__args, **self.__kwargs)
File "/usr/lib/python2.6/dist-packages/twisted/python/threadpool.py", line 210, in _worker
result = context.call(ctx, function, *args, **kwargs)
File "/usr/lib/python2.6/dist-packages/twisted/python/context.py", line 59, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python2.6/dist-packages/twisted/python/context.py", line 37, in callWithContext
return func(*args,**kw)
--- <exception caught here> ---
File "/usr/lib/python2.6/dist-packages/twisted/enterprise/adbapi.py", line 436, in _runInteraction
conn.rollback()
File "/usr/lib/python2.6/dist-packages/twisted/enterprise/adbapi.py", line 52, in rollback
self._connection.rollback()
_mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away')
我的代码是这样的......
from twisted.internet import reactor, defer,threads
from twisted.enterprise import adbapi
dbpool = adbapi.ConnectionPool("MySQLdb", '192.168.1.102','test', 'test', 'test')
class Scanner:
def _execQuery(self,txn):
sql="SELECT tool_id,tool_name FROM tool_master"
txn.execute(sql)
result = txn.fetchall()
return result
def objCursor(self):
return dbpool.runInteraction(self._execQuery)
def printResult(self,result):
print "resssssssssssssssssss",result
reactor.callLater(3,self.deferExecute)
def deferExecute(self):
self.objCursor().addCallback(self.printResult)
Scanner()
class MyApp(object):
reactor.callInThread(Scanner().deferExecute)
reactor.run()
MyApp()
有人能告诉我为什么会收到此错误吗？
答案 0 :(得分：2)
can anyone tell me why I am getting this error..，因为你做错了。
runInteraction使用游标的参数运行提供的函数到一个在线程中运行的事务。你不应该打电话给reactor.callInThread(Scanner().deferExecute)。
尝试纠正格式错误的代码，我想你已经得到了这个：
from twisted.internet import reactor, defer,threads
from twisted.enterprise import adbapi
dbpool = adbapi.ConnectionPool("MySQLdb", '192.168.1.102','test', 'test', 'test')
class Scanner:
def _execQuery(self,txn):
sql="SELECT tool_id,tool_name FROM tool_master"
txn.execute(sql)
result = txn.fetchall()
return result
def objCursor(self):
return dbpool.runInteraction(self._execQuery)
def printResult(self,result):
print "resssssssssssssssssss",result
reactor.callLater(3,self.deferExecute)
def deferExecute(self):
self.objCursor().addCallback(self.printResult)
Scanner()
class MyApp(object):
reactor.callInThread(Scanner().deferExecute)
reactor.run()
MyApp()
当您可能需要以下内容时。如果您打算编写一个扭曲的Application，则很容易修改此Scanner类以继承twisted.application.service.Service。
from twisted.internet import reactor, defer, task
from twisted.enterprise import adbapi
class Scanner(object):
def __init__(self,dbpool=None):
self.dbpool = dbpool
self.loopCall = task.LoopingCall(self.myQuery)
def start(self):
print "Started scanner"
self.loopCall.start(3)
def stop(self):
print "Stopping scanner"
self.loopCall.stop()
def myQuery(self):
def interact(txn):
sql="SELECT tool_id,tool_name FROM tool_master"
txn.execute(sql)
return txn.fetchall()
d = self.dbpool.runInteraction(interact)
d.addCallbacks(self.printResult,self.printError)
def printResult(self,result):
print "Got Result: %r" % result
def printError(self,error):
print "Got Error: %r" % error
error.printTraceback()
if __name__ == '__main__':
from twisted.internet import reactor
dbpool = adbapi.ConnectionPool("MySQLdb", '192.168.1.102','test', 'test', 'test')
s = Scanner(dbpool)
reactor.callWhenRunning(s.start)
reactor.addSystemEventTrigger('before','shutdown',s.stop)
reactor.run()
答案 1 :(得分：2)
毕竟建议＆amp; Matt的帮助我有以下代码正在成功运行：
#!usr/bin/python
# Using the "dbmodule" from the previous example, create a ConnectionPool
from twisted.internet import reactor
from twisted.enterprise import adbapi
from twisted.internet import reactor, defer,threads
from twisted.python.threadpool import ThreadPool
import itertools
from twisted.internet.threads import deferToThread
from twisted.internet import reactor, defer, task
from tools.printTime import *
from tools.getVersion import *
from sh_log import *
concurrent = 30
finished=itertools.count(1)
reactor.suggestThreadPoolSize(concurrent)
#Creating Global Instance variables
path="tools"
lo=Log()
class ToolsBuilder:
def build(self,txn,tool,asset_id):
if tool:
print "\n"
try:
sql="select tool_filename from tool_master where tool_id = %s" %(tool,)
sql_asset="select asset_url from asset_master where asset_id = %s" %(asset_id,)
txn.execute(sql_asset)
asset_url = txn.fetchall()
log_date=lo.log_date()
txn.execute(sql)
result = txn.fetchall()
log='\n'+log_date+"::"+str(result[0][0])+ " tool object is created......\n"
lo.wfile(log)
temp=(path +'/' + str(result[0][0]))
if result:
if temp:
f=open(temp).read()
obj_tool=compile(f, 'a_filename', 'exec')
return obj_tool
except:
lo.wfile("Error in creating executable tool object......")
tb=ToolsBuilder()
class ToolsVectorGenerator:
def generate(self,txn,res_set={}):
v1=[]
for asset_id in res_set.iterkeys():
try:
obj_tools=[]
if asset_id:
print "asset_id..............................",asset_id
log_date=lo.log_date()
log=log_date+"::"+" \nVector generation for the asset number...:"+str(asset_id)
lo.wfile(log)
vector=[]
tools_arr=[]
obj_tools=[]
for tool in res_set[asset_id]:
if tool:
print "tool..............",tool
temp_tool=tb.build(txn,tool,asset_id)
print "temp_tool..........",temp_tool
#fetch data of tool setting.....
sql_tool_setting="select * from tool_asset_settings where tool_id =%s" %(tool,)
txn.execute(sql_tool_setting)
result_tool_setting = txn.fetchall()
tool_id=result_tool_setting[0][1]
t_id=int(tool_id)
tool_id_arr=[]
tool_id_arr.append(t_id)
tool_id_arr.append(result_tool_setting)
tool_id_arr.append(temp_tool)
tools_arr.append(tool_id_arr)
#fetch data from asset master
sql_asset="select asset_name from asset_master where asset_id=%s" %(asset_id,)
txn.execute(sql_asset)
result_asset = txn.fetchall()
vector.append(result_asset)
vector.append(tools_arr)
except:
lo.wfile("\nError in getting asset,please check your database or network connection......")
tvm.executeVector(vector)
tvg=ToolsVectorGenerator()
class Tool:
def exectool(self,tool):
exec tool
return
def getResult(self,tool):
return deferToThread(self.exectool, tool)
to=Tool()
class StateMachine:
def setPriority(self,txn,tup):
temp=[]
arr=[]
for li in tup:
sql2="select tool_dependency from tool_asset_settings where tool_id =%s" %(li[1],)
txn.execute(sql2)
result12 = txn.fetchall()
arr=[]
if result12[0][0]!=None:
tup12=result12[0][0]
arr=(li[0],tup12)
# print "arr.........",arr
if arr in tup:
print "This element is already exist......."
else:
temp.append(arr)
temp.extend(tup)
return tuple(temp)
st=StateMachine()
class ToolsVectorExecutionManager(object):
def executeVector(self,toolsvector):
print "toolsvector================>",toolsvector
if toolsvector:
for tools in toolsvector[1]:
if tools[2] != None:
to.getResult(tools[2])
tvm=ToolsVectorExecutionManager()
class ToolsToExecuteAnalyzer:
def __init__(self,dbpool=None):
self.dbpool = dbpool
self.loopCall = task.LoopingCall(self.myQuery)
def start(self):
print "Started scanner"
self.loopCall.start(3)
def stop(self):
print "Stopping scanner"
self.loopCall.stop()
def myQuery(self):
def interact(txn):
sql="SELECT tool_asset_id,tool_execute_id FROM tool_to_execute where status='0'"
txn.execute(sql)
result=txn.fetchall()
if result:
tool_asset_id=tuple([int(e[0]) for e in result])
tool_execute_id=tuple([int(e[1]) for e in result])
if len(tool_asset_id)>1:
sql1="SELECT asset_id,tool_id FROM tool_in_assets WHERE tool_asset_id IN %s"%(tool_asset_id,)
else:
sql1="SELECT asset_id,tool_id FROM tool_in_assets WHERE tool_asset_id = (%s)"%(tool_asset_id)
txn.execute(sql1)
tup = txn.fetchall()
#dependency check for the selected tool
asset_tool=st.setPriority(txn,tup)
log_date=lo.log_date()
log=log_date+"::priority have been set for the tools......\n"
lo.wfile(log)
#creating group of asset with their tools
res={}
for element in asset_tool:
if element[0] in res:
res[element[0]].append(int(element[1]))
else:
res[int(element[0])] = [int(element[1])]
#Recored deletion from tool_to_execute table
if res!=None and res.keys()!=[]:
for asset_id in res.iterkeys():
if len(tool_execute_id)>1:
sql_del="delete from tool_to_execute where tool_execute_id in %s " %(tool_execute_id,)
else:
sql_del="delete from tool_to_execute where tool_execute_id = %s" %(tool_execute_id)
txn.execute(sql_del)
#New Addition of vector
tvg.generate(txn,res)
# return res
d = self.dbpool.runInteraction(interact)
d.addCallbacks(self.printResult,self.printError)
def printResult(self,res):
print "In printResult after generate...."
def printError(self,error):
print "Got Error: %r" % error
error.printTraceback()
ToolsToExecuteAnalyzer()
if __name__ == '__main__':
from twisted.internet import reactor
dbpool = adbapi.ConnectionPool("MySQLdb", 'localhost', 'test', 'test','test')
s = ToolsToExecuteAnalyzer(dbpool)
reactor.callWhenRunning(s.start)
reactor.addSystemEventTrigger('before','shutdown',s.stop)
reactor.run()
这是我的整个代码，我只是想知道有多少线程在运行，每个工具的新线程意味着什么？ 无论如何，感谢Matt的帮助...... :)
答案 2 :(得分：0)
您可能还想看看这个片段，它提供了一个ConnectionPool子类，它重新连接“MySQL服务器已经消失”。
http://www.gelens.org/2009/09/13/twisted-connectionpool-revisited/