There is/was Coro::LWP, which integrated LWP with Coro, but so far I have not found a good way to make LWP::UserAgent-based scripts parallel without rewriting them.

I am fond of using Future, but also had good success using Mojo::UserAgent. Both have APIs somewhat different from LWP::UserAgent though.

With both systems, the logic would very much like the approach you outlined above:

# Using (my own) Future::HTTP, which provides an AnyEvent::HTTP-like A
+PI

my $ua = Future::HTTP->new();

# Fire off all requests at once, rate limiting etc. is left as an exer
+cise
my @outstanding;
for my $url (@requests) {
    my $res = $ua->http_get($url)->then(sub {
        my( $body, $data ) = @_;
        # ... handle the response
        return $body
    });
    push @outstanding, $res;
};

while( @outstanding ) {
    my $body = (shift @outstanding)->get;
    ...
};

[download]

With Mojolicious you can look at COWS::Crawler, which also implements something like the following API:

  my $crawler = COWS::Crawler->new();
  $crawler->submit_request({ method => 'GET', url => $url, info => { u
+rl => $url }} );
  while( my ($page) = $crawler->next_page ) {
      my $body = $page->{res}->body;
      my $url = $page->{req}->req->url;
      ...
  };

[download]

But all of these approaches need a real rewrite of the formerly sequential program logic into asynchronous execution.

In reply to Re: LWP::UserAgent non-blocking calls by Corion
in thread LWP::UserAgent non-blocking calls by cavac

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.