I have been trying to harvest metadata using OAI-PMH protocol and also using a perl based harvester called 'Harvey' but I seem to be stuck at the below issue. My last resumptionToken is "resumptionToken=2019-01-22T00:51:30Z!2037-01-01T00:00:00Z!!oai_dc!6045389!7351939!oai:union.ndltd.org:IBICT/aoi:localhost:jspui/2251" please let me know where I should add this on the Perl code for the process to continue? On the Perl code below, I see the variable resumptionToken at 4 places (Lines: 12, 21, 52,57).

$| = 1;

my $baseURL = 'http://union.ndltd.org/OAI-PMH/';

my $filename = 'aaaaafna';
my $resumptionToken = '2019-01-22T00:51:30Z!2037-01-01T00:00:00Z!!oai_
+dc!6045389!7351939!oai:union.ndltd.org:IBICT/aoi:localhost:jspui/2251
+';

use LWP::UserAgent;
$ua = LWP::UserAgent->new;
# before running this script, execute:
#   export http_proxy=http://localhost:<port>/   where <port> is your 
+cntlm port
$ua->env_proxy();

do {
   my $reqURL = $baseURL.'?verb=ListRecords&'.(($ eq '')?'metadataPref
+ix=oai_dc':'resumptionToken='.$resumptionToken);
# my $reqURL = $baseURL.'?verb=Identify';
   my $req = HTTP::Request->new( GET => $reqURL );
   
   print "Harvesting $reqURL\n";
   my $state = 0;
   my $res;
   while ($state == 0)
   {
      $res = $ua->request($req);
      if ($res->code == 503)
      {
         my $sleep = $res->header ('Retry-After');
         if (not defined ($sleep) || ($sleep < 0) || ($sleep > 86400))
         { $state = 1;}
         else
         { 
            print "Sleeping for $sleep seconds\n";
            sleep ($sleep); 
         }
      }
      else
      { $state = 1; }
   }

   my $content = $res->content;
   my $records = (split (/<metadata>/, $content))-1;
   print "Saving response with $records records to $filename.xml\n";
   open (FILE, ">$filename.xml"); print FILE $content; close (FILE);
   $filename++;   
   
   $resumptionToken = '';
   if ($content =~ /<resumptionToken[^>]*>([^<]+)<\/resumptionToken>/)
   {
      $resumptionToken = $1;
   }
} while ($resumptionToken ne '');

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In reply to Meta Data Harvesting Using perl by jarviscrypter

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