Hi Alexander,
I haven't had a chance to implement streaming in Poet/Mason2 yet,
unfortunately. Patches are welcome. :)
Jon
On Oct 4, 2012, at 9:14 AM, Alexander wrote:
> Dear colleagues,
>
> I have rather massive SQL query results to be fed as CSV to the client. What
> I currently did is mounted a separate mount point in Plack and defined a
> streaming interface:
>
> package DF::Stream;
> [... use, constants, etc ... ]
> method csv($psgi_env, $responder) {
> my $writer = $responder->([ 200, [ 'Content-Type', 'text/csv' ] ]);
> [... some computation ....]
> while ($query->row) {
> $writer->write(join("\t", @$_),"\n");
> }
> $writer->close();
> }
> 1;
>
>
> [ later in app.psgi ]
>
> mount '/csv/' => sub {
> my $psgi_env = shift;
> $psgi_env->{'psgi.streaming'} or return [ 501,
> ['Content-Type','text/plain'], [] ];
>
> return sub {
> my $responder = shift;
>
> my $stream = new DF::Stream(conf => $conf->{data});
> $stream->csv($psgi_env, $responder);
> };
> };
>
>
>
> That works, but every time I need a new stream I have to introduce a new
> package and mount a new path.
>
>
> Is there a way to define a streaming interface as normal Mason components
> without Plack hacks? Any clue will be greatly appreciated.
>
> --
> Sincerely yours, Alexander Kuznetsov
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