Hi folks:
Not sure if many people are doing this, but let me try to indicate
what I am doing. I replaced a blocking Mojo::UserAgent call with an
asynchronous version, and the associated call back/closure.
First off, this all works. The code in question is as follows
my $tx = $ua->build_tx(GET => $url);
$output = "";
$tx->res->max_message_size(0);
$tx->res->content->unsubscribe('read')
->on(read => sub {
my ($content, $bytes) = @_;
$tf = [gettimeofday];
$dt = tv_interval ($t0,$tf);
$t0 = $tf;
printf STDERR "D[%i]
Scalable::TSDB::_send_chunked_get_query -> reading %-.6fs \n",$$,$dt if
($self->debug()) ;
$output .= $bytes;
});
# Process transaction
$ret = $ua->start($tx);
Largely a cut and paste from the UserAgent portion of the cookbook, and
other docs.
This works.
But it raises other issues. In the code it replaced, I could get a
return code from the remote server for the request, that I used in
diagnostics. Now that is somewhat less defined (return code for each
chunk or for all chunks), and where/how do I access it?
I would imagine that if we have a return code per chunk, that I could
push these onto an array, and then search for anything not a particular
set of values (a naive approach, but we need to start somewhere). But
then the question of how to handle M bad chunks out of N, or indicate
that we have missing chunks?
I don't control the server side of this, and am simply developing a
client for the service. So for the moment I can't change the server side.
This said, how do people a) detect, b) handle missing chunks or errors
in chunks? The error detection part is non-trivial, as I don't think
many servers provide CRC/Content-MD5 headers per chunk. See
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.15
Does anyone have advice/experience/guidance on any of this? For this
application, its not so important if we miss data (read only access to
data), but I'd like to know if this is a solved problem, and if so how
people solved it. Googling didn't help much here.
Thanks in advance!
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