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| Guest |
 Posted: Mon Jan 14, 2008 5:35 am |
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Guest
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The erlyweb documentation states to return arbitary yaws tuples the
app_controller should surround it in a {response, Elem} tuple. This
doesn't seem to work for {streamcontent, MimeType, FirstChunk}. I
checked that it works directly with yaws with an example similar to
http://yaws.hyber.org/stream.yaws but erlyweb bombs with
ERROR erlang code crashed:
File: appmod:0
Reason: {invalid_response,[{streamcontent,"image/gif",<<>>}],
"Response values other than 'data' and 'ewc'
tuples must be enclosed a 'response' tuple. In addition, subcomponents
may only return 'data' and/or 'ewc' tuples."}
this seems to suggest that erlyweb is calling it's render_subcomponent/2
which is not what I think I'm after. I've tried a few other combinations
to try and get this working, but seem to be missing something. Anyone
care to tell me where I'm going wrong.
Jeff.
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| Guest |
| Posted: Tue Jan 15, 2008 2:56 am |
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Guest
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I solved this by using
hook(A) ->
.....
{phased, streamer:out(A),
fun(_Ewc, Data, _Phasedvars) ->
Data
end};
instead of
{phased, {ewc, A},
fun(_Ewc, Data, _PhasedVars) ->
{ewc, html_container, index, [A, {data, Data}]}
end}
However, this leaves me with the problem of how to tell apart which
calls are going to need to be called by which of the above methods
without a whole lot of hard coding. thoughts?
Jeff.
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| Guest |
| Posted: Tue Jan 15, 2008 3:27 am |
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Guest
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Scratch everything I've said the following seems to work. Still don't
know why it didn't work it the first place.
Jeff.
app_controller.erl:
hook(A) ->
.....
{phased, {ewc, A},
fun(_Ewc, Data, _PhasedVars) ->
{ewc, html_container, index, [A, {data, Data}]}
end};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% module_controller.erl:
-module(module_controller).
-export([
image/2,
]).
-define(IMAGECMD, "cat /path/to/image.gif").
image(A, _Key) ->
Self = self(),
spawn(fun() ->
%% Read random junk
P = open_port({spawn, ?IMAGECMD},
[binary,stream, eof]),
rec_loop(Self, P)
end),
{response, {streamcontent, "image/gif", <<>>}}.
rec_loop(YawsPid, P) ->
receive
{P, {data, BinData}} ->
%% yaws_api:stream_chunk_deliver(YawsPid, BinData),
yaws_api:stream_chunk_deliver_blocking(YawsPid, BinData),
rec_loop(YawsPid, P);
{P, eof} ->
port_close(P),
yaws_api:stream_chunk_end(YawsPid),
exit(normal)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% module_view.erl:
-module(module_view).
-export([
image/1,
]).
image(Data) -> Data.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
End of Example.
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