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| Guest |
 Posted: Sun Oct 26, 2008 4:52 am |
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Guest
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Hi guys
Does anyone have an example of how to use before_call to check if a
user is logged in assuming that we use sessions to track logged in
users? I am in a bit of trouble trying to get this to work. I have
something like below:
before_call(is_logged_in, A) ->
{is_logged_in, [A]}.
is_logged_in([A]) ->
case utilman:check_cookie(A) of
{ok, Sess} ->
% do something
_ ->
% do something
end.
I get a long error trace when I try to access a function in the
controller:
Reason: {undef,
[{dashboard_controller,before_call,
[index,
[{arg,#Port<0.5879>,
{{127,0,0,1},60507},
{headers,"keep-alive",
....
Does anyone know how to make this work?
Thanks
Nii AMon
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| Guest |
| Posted: Sun Oct 26, 2008 10:57 am |
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Guest
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It appears that I needed to include the before_call/2 in the list of
exported functions. That takes care of the previous problem.
However I have come up with a new problem. So now I have this:
before_call(is_logged_in, A) ->
io:format("hello. I see you").
just to test to see if the call would be made right. I end up with
this error:
ERROR erlang code crashed:
File: appmod:0
Reason: {function_clause,
[{dashboard_controller,before_call,
[index,
[{arg,#Port<0.7415>,
{{127,0,0,1},49695},
{headers,"keep-alive",
"text/xml,application/xml,application/xhtml
+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
"localhost:
8057",undefined,undefined,undefined,
undefined,undefined,undefined,undefined,
"Mozilla/5.0 (Macintosh; U; PPC Mac OS X;
en) AppleWebKit/523.12.2 (KHTML, like Gecko) Version/3.0.4 Safari/
523.12.2",
undefined,
...
From what I see, this means that no function clause matched the
incoming function signature. Has anyone used before_call/2
successfully?
Thanks
Nii AMon
On Oct 26, 4:52 |
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| dmitriid |
| Posted: Mon Oct 27, 2008 12:04 pm |
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User
Joined: 17 Aug 2006
Posts: 213
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On Oct 26, 2008, at 12:57 PM, nii amon wrote:
>
> It appears that I needed to include the before_call/2 in the list of
> exported functions. That takes care of the previous problem.
>
> However I have come up with a new problem. So now I have this:
>
> before_call(is_logged_in, A) ->
> io:format("hello. I see you").
>
> just to test to see if the call would be made right. I end up with
> this error:
I believe this should be something like this:
-export([before_call/2]).
before_call(is_logged_in, A) ->
io:format("hello"),
{is_logged_in, A};
before_call(Func, A) ->
{Func, A}.
because we need to return {NewFuncName::atom(), NewParams::[term()]}
from this function
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| Guest |
| Posted: Mon Oct 27, 2008 8:44 pm |
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Guest
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Thanks man.
Do you know if there is anything more I have to do: I have a trace
statement put in the execution of before_call/2 but I don't see it
being printed in the console and it does not appear to redirect to the
URL I point it to. I don't think it works at all.
I think we should all work towards a wiki for erlyweb so that people
who have done stuff like this sort of stuff before would be able to
document it. But as it stands, even for the simplest things, it seems
you have to go through a lot of effort due to inadequate
documentation.
On Oct 27, 12:04 |
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| dmitriid |
| Posted: Tue Oct 28, 2008 10:16 am |
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Joined: 17 Aug 2006
Posts: 213
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Hm.... What I always do, is I start yaws in intractive mode (yaws -i or sudo yaws -i) and then do all the erlyweb stuff from there. Then I see all the io:format messages just fine
How do you attempt to do the redirect? Since before_call should return a tuple in the form of {NewFunc, Params}, a redirect to a different function may probably look like this (this is untested, so there could be mistakes):
-compile(export_all).
before_call(call_1, A) ->
{new_func, A}; %% substitute function, no visible redirect
before_call(call_2, A) ->
{call_2, A}; %% call the actual function,
%%let the function do a redirect
before_call(call_3, A) ->
{new_func_3, A}. %% call a substtute function,
%% let it do a redirect,
%% same as above, with a new name
new_func(A) ->
do_some_stuff,
{data, ok}.
call_2(A) ->
{ewr, some_controller}.
new_func_3(A) ->
{ewr, some_other_controller}.
As for a wiki, that'd be grand  The only problem is that it should really be an Erlang-based wiki to show off the ErlyWeb... Or, probaby, some interim wiki...
Quote: Thanks man. Do you know if there is anything more I have to do: I have a trace statement put in the execution of before_call/2 but I don't see it being printed in the console and it does not appear to redirect to the URL I point it to. I don't think it works at all. I think we should all work towards a wiki for erlyweb so that people who have done stuff like this sort of stuff before would be able to document it. But as it stands, even for the simplest things, it seems you have to go through a lot of effort due to inadequate documentation. On Oct 27, 12:04�pm, Dmitrii Dimandt <dmitr...@gmail.com> (dmitr...@gmail.com) wrote: [/code] Quote: On Oct 26, 2008, at 12:57 PM, nii amon wrote: [/code] Quote: It appears that I needed to include the before_call/2 in the list of exported functions. That takes care of the previous problem. [/code] Quote: However I have come up with a new problem. So now I have this: [/code] Quote: before_call(is_logged_in, A) -> � � � �io:format("hello. I see you"). [/code] Quote: just to test to see if the call would be made right. I end up with this error: [/code] I believe this should be something like this: -export([before_call/2]). before_call(is_logged_in, A) -> � � �io:format("hello"), � � �{is_logged_in, A}; before_call(Func, A) -> � � �{Func, A}. because we need to return {NewFuncName::atom(), NewParams::[term()]} � from this function [/code] [/code]
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| Guest |
| Posted: Thu Oct 30, 2008 4:15 pm |
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Guest
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Thanks for the response.
Yes I agree, the Wiki should be erlang-based. But in the interim we
can really use something that is not till we have one. Do you know of
any open source erlang Wikis out there?
On Oct 28, 10:15 |
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| Guest |
| Posted: Thu Oct 30, 2008 5:43 pm |
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| dmitriid |
| Posted: Tue Nov 04, 2008 12:28 pm |
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Joined: 17 Aug 2006
Posts: 213
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There are plenty.
Wikipedia's Mediawiki, <http://www.mediawiki.org/wiki/MediaWiki>, and PM
Wiki, <http://www.pmwiki.org/>, are two wikis I've used myself. There are
more: <http://en.wikipedia.org/wiki/Comparison_of_wiki_software>
Each wiki has it' strengths and weaknesses, of course
--On October 30, 2008 9:14:59 AM -0700 nii amon <jazzyy@gmail.com> wrote:
>
> Thanks for the response.
>
> Yes I agree, the Wiki should be erlang-based. But in the interim we
> can really use something that is not till we have one. Do you know of
> any open source erlang Wikis out there?
>
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| Guest |
| Posted: Tue Nov 04, 2008 4:19 pm |
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Guest
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Ok we are spoilt for choice. Why don't we just choose one and host it?
I don't have server space but if someone donates the space I would not
mind doing the deploy.
On Nov 4, 7:37 |
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| wailian |
| Posted: Tue Mar 20, 2012 2:40 am |
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Guest
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