晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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'''
 resmod.py: This example shows how to modify the response from iterator 

 Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
                     Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)

 This software is open source.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
 
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
 
    * Neither the name of the organization nor the names of its
      contributors may be used to endorse or promote products derived from this
      software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
'''

def init(id, cfg): return True

def deinit(id): return True

def inform_super(id, qstate, superqstate, qdata): return True

def setTTL(qstate, ttl):
    """Updates return_msg TTL and the TTL of all the RRs"""
    if qstate.return_msg:
        qstate.return_msg.rep.ttl = ttl
        if (qstate.return_msg.rep):
            for i in range(0,qstate.return_msg.rep.rrset_count):
                d = qstate.return_msg.rep.rrsets[i].entry.data
                for j in range(0,d.count+d.rrsig_count):
                    d.rr_ttl[j] = ttl

def operate(id, event, qstate, qdata):
    if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):
        #pass the query to validator
        qstate.ext_state[id] = MODULE_WAIT_MODULE 
        return True

    if event == MODULE_EVENT_MODDONE:
        log_info("pythonmod: iterator module done")

        if not qstate.return_msg:
            qstate.ext_state[id] = MODULE_FINISHED 
            return True

        #modify the response

        qdn = qstate.qinfo.qname_str
        if qdn.endswith(".nic.cz."):
            #invalidate response in cache added by iterator
            #invalidateQueryInCache(qstate, qstate.return_msg.qinfo)

            #modify TTL to 10 secs and store response in cache
            #setTTL(qstate, 5)
            #if not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0):
            #    qstate.ext_state[id] = MODULE_ERROR
            #    return False

            #modify TTL of response, which will be send to a) validator and then b) client
            setTTL(qstate, 10)
            qstate.return_rcode = RCODE_NOERROR

        qstate.ext_state[id] = MODULE_FINISHED 
        return True
      
    log_err("pythonmod: bad event")
    qstate.ext_state[id] = MODULE_ERROR
    return True

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