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Automated web client to wait for results page
this example from a Well House Consultants training course
Source code: coojar Module: A805
use LWP::UserAgent;
# This script uses the LWP module to read back a series # of response pages from a server - the "holding" pages # followed by the actual results - and presents the # automatic results. # Note that there are several methods that a web site can # use to present delayed results after a holding page - it # could be done via server push (using a multipart response) # or client pull with a refresh header, or using javascipt # in the browser. This is a client pull example and the code # would be very different if you werw writing it for a web # site that uses one of the other approaches. # Set up thsi program as a browser my $ua = LWP::UserAgent->new; $ua->agent("Automated Waiting Script"); # Set it up to handle cookies between pages in the client # pull series (the server we are using sends a cookie with the # first response which the client must then use when it asks # "how are you getting on?" of the server. For this demo, it's # OK if the following fails to read any existing set of cookies, # as the only one that matters is the one between the pages of the # application. my $jar = $ua->cookie_jar({ file => "/home/wellho/testing/cookies", hide_cookie2 => 1, autosave => 1, ignore_discard => 1}); # Call up a response, and keep calling up until you get one which # does NOT include the refresh header. while (1) { $response = $ua -> get("http://www.wellho.net/demo/dozen.php"); $body = $response->content(); # Extract information and report on progress # Just to show how the demo is working! ($report) = $body =~ /%start%(.*)%end%/s; print "Intermediate: $report\n"; # Do we have a refresh header (regex could be far more # general and robust here!)? If we do have a refresh # header, honour its wait time. If we don't exit the # loop as we have the final result. if (($twait) = $body =~ m!(\d+); URL=/demo/dozen.php!) { sleep $twait; } else { last; } } # No more refresh headers - we have the final result now! print "FINAL RESULT: $report\n"; __END__ Sample results from running this program: -bash-3.2$ perl coojar Intermediate: Running ... 0 seconds gone Intermediate: Running ... 5 seconds gone Intermediate: Running ... 10 seconds gone Intermediate: Running ... 15 seconds gone Intermediate: Completed ... 03:47:40 up 3 days, 11:52, 1 user, load average: 0.41, 0.45, 0.27 FINAL RESULT: Completed ... 03:47:40 up 3 days, 11:52, 1 user, load average: 0.41, 0.45, 0.27 -bash-3.2$ Learn about this subject
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