以前,我在ejabberd 2.1.10中的调试行中使用了xml:get_tag_attr_s(“type”,Packet),但是在ejabberd 13.03中该功能不再起作用。可能是因为它已根据文档(http://www.process-one.net/docs/exmpp/devdoc/trunk/xml.html#get_attr_s-2)弃用,所以我尝试使用exmpp库中的函数。
我在第二个调试行(第一个调试行工作正常)上收到错误。以及如何从属性中获取值(value)的想法?
代码摘录:
on_user_send_packet(From, To, Packet) ->
?DEBUG("Sent packet (1): ~p", [Packet]),
Type = exmpp_xml:get_attribute(Packet, <<"type">>, <<"unknown">>),
?DEBUG("Sent packet from (2): ~p", [From]),
日志:
=INFO REPORT==== 2013-05-25 09:58:50 ===
D(<0.1625.0>:mod_stanza_ack:59) : Sent packet (1): {xmlel,<<"message">>,
[{<<"to">>,
<<"31600000002@whatsupp_dev">>},
{<<"from">>,
<<"31600000001@whatsupp_dev/webapp">>},
{<<"type">>,<<"chat">>},
{<<"id">>,<<"4834">>}],
[{xmlel,<<"body">>,[],
[{xmlcdata,
<<"SHOOOOOT">>}]},
{xmlel,<<"request">>,
[{<<"xmlns">>,
<<"urn:xmpp:receipts">>}],
[]}]}
=ERROR REPORT==== 2013-05-25 09:58:50 ===
E(<0.1625.0>:ejabberd_hooks:315) : {function_clause,
[{exmpp_xml,get_attribute,
[{xmlel,<<"message">>,
[{<<"to">>,
<<"31600000002@whatsupp_dev">>},
{<<"from">>,
<<"31600000001@whatsupp_dev/webapp">>},
{<<"type">>,<<"chat">>},
{<<"id">>,<<"4834">>}],
[{xmlel,<<"body">>,[],
[{xmlcdata,<<"SHOOOOOT">>}]},
{xmlel,<<"request">>,
[{<<"xmlns">>,
<<"urn:xmpp:receipts">>}],
[]}]},
<<"from">>,<<"unknown">>],
[{file,"./core/exmpp_xml.erl"},
{line,1173}]},
{mod_stanza_ack,on_user_send_packet,3,
[{file,"mod_stanza_ack.erl"},{line,60}]},
{ejabberd_hooks,run1,3,
[{file,"ejabberd_hooks.erl"},
{line,311}]},
{ejabberd_c2s,session_established2,2,
[{file,"ejabberd_c2s.erl"},{line,1136}]},
{p1_fsm,handle_msg,10,
[{file,"p1_fsm.erl"},{line,578}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,239}]}]}
最佳答案
您要传递给Packet
的exmpp_xml:get_attribute
是一个xmlel
记录,其中包含三个字段:元素名称,属性和子元素。但是,exmpp用五个元素(definition from here)定义了xmlel
记录:
% Elements.
-record(xmlel, {
ns = undefined :: xmlname() | undefined,
declared_ns = [] :: [{xmlname(), string() | none}],
name :: xmlname(),
attrs = [] :: [xmlattr()],
children = [] :: [#xmlel{} | xmlcdata()] | undefined
}).
我快速浏览了ejabberd 13.03源代码,看起来
xml:get_tag_attr_s
应该可以正常工作,因此我怀疑ejabberd 13.03与exmpp不兼容。 (尽管最近我没有密切关注ejabberd的开发,所以希望对此有所了解。)我认为您最好尝试弄清楚get_tag_attr_s
为什么会中断您的工作。关于erlang - 使用exmpp函数时出现函数子句错误,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/16747702/