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package WebSource::Fetcher; |
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2639
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use strict; |
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use LWP::UserAgent; |
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use HTTP::Cookies; |
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use WebSource::Module; |
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use Carp; |
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eval "use Net::INET6Glue::INET_is_INET6"; # use Net::INET6Glue::INET_is_INET6 when available |
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our @ISA = ('WebSource::Module'); |
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=head1 NAME |
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WebSource::Fetcher : fetching module |
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When run downloads given urls and returns the corresponding http response |
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=head1 DESCRIPTION |
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A fetch operator is declared with the following format : |
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=head1 SYNOPSIS |
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$fetcher = WebSource::Fetcher->new(wsnode => $node); |
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# for the rest it works as a WebSource::Module |
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=head1 METHODS |
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=over 2 |
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=item B<< $source = WebSource->new(desc => $node); >> |
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Create a new Fetcher; |
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=cut |
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sub _init_ { |
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my $self = shift; |
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$self->{method} or $self->{method} = 'GET'; |
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$self->log(6,"Default method set to '",$self->{method},"'"); |
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$self->SUPER::_init_; |
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$self->{useragent} or $self->{useragent} = |
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LWP::UserAgent->new( |
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agent => "WebSource/1.0", |
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keep_alive => 1, |
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timeout => 20, |
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env_proxy => 0, |
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); |
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if($self->{cookies}) { |
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$self->log(5,"Got cookie jar : ",$self->{cookies}); |
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} else { |
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$self->log(5,"Creating new cookie jar"); |
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$self->{cookies} = HTTP::Cookies->new; |
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} |
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$self->{maxreqinterval} or $self->{maxreqinterval} = 3; |
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$self->{maxtries} or $self->{maxtries} = 3; |
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} |
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sub makeRequest { |
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my $self = shift; |
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my $env = shift; |
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if($env->type eq "object/http-request") { |
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return $env->data; |
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} |
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my $str = $env->dataString; |
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my $uri = $env->{baseuri} ? |
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URI->new_abs($str,$env->{baseuri}) : |
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URI->new($str); |
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if($uri) { |
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$self->log(6,"Generating HTTP::Request for $uri with method '",$self->{method},"'"); |
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return HTTP::Request->new($self->{method},$uri); |
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} |
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return undef; |
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} |
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79
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=item B<< $fetcher->handle($env); >> |
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Builds an HTTP::Request from the data in enveloppe, fetches |
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the URI (eventually stores it in a file) and builds |
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the corresponding DOM object |
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=cut |
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sub handle { |
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my $self = shift; |
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my $data = shift; |
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# my $request = $self->makeRequest($data); |
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my $request = $data->dataAsHttpRequest; |
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if(!$request) { |
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$self->log(1,"Couldn't convert to HTTP::Request"); |
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return (); |
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} |
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my $scheme = $request->uri->scheme; |
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if(!($scheme eq "http" || $scheme eq "ftp" || $scheme eq "https" || $scheme eq "file")) { |
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$self->log(1,"Can't fetch scheme ",$scheme); |
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return (); |
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} |
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$self->log(5,"Handling request \n",$request->as_string); |
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# $self->{cookies}->add_cookie_header($request); |
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$self->log(3, "Posting request\n", |
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"-------------------\n", |
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$request->as_string, |
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"-------------------"); |
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my $tries = $self->{maxtries}; |
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$tries > 0 or $tries = 1; |
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my $response; |
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while($tries > 0) { |
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$self->temporize(); |
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$self->log(5, "Try ", $self->{maxtries} - $tries + 1, " / ", $self->{maxtries}); |
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$response = $self->{useragent}->request($request);; |
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$tries = $response->is_success ? 0 : $tries - 1; |
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($response->code eq "500" && $response->message =~ m/SIGINT/) |
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and die($response->message); |
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$self->log(5, "Response status : ",$response->status_line); |
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} |
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if($response->is_success) { |
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$self->log(1, "success"); |
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# $self->{cookies}->extract_cookies($response); |
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my $base = $response->request->uri; |
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my %meta = %$data; |
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$self->log(6,"Meta data is as follows :\n", |
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map{ $_ . " => " . $meta{$_} ."\n" } keys(%meta) |
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); |
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$self->log(3,$response->headers->as_string()); |
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$response->headers->scan(sub { my ($h,$v) = @_; $meta{$h} = $v; }); |
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if($meta{'Content-Type'}) { |
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$self->log(2,"Parsing Content-Type: ".$meta{'Content-Type'}); |
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if($meta{'Content-Type'} =~ m/([A-Za-z0-9\/\-]+)(?:;\s+charset=([a-zA-Z0-9\-]+))?/) { |
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$meta{type} = $1; |
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$meta{encoding} = $2; |
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} |
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} |
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# $meta{encoding} = $response->content_encoding; |
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# $meta{type} = $response->content_type; |
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$meta{baseuri} = $base; |
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$meta{data} = $response->content; |
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$self->log(2,"Content-Encoding: ".$meta{encoding}); |
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return WebSource::Envelope->new(%meta); |
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} else { |
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if ($response->{request}) { |
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$self->log(1, "WebSource : couldn't fetch ", |
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$request->uri, " received ", |
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$response->{request}->status_line); |
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} else { |
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$self->log(1, $response->message); |
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} |
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} |
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return (); |
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} |
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156
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sub temporize { |
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my $self = shift; |
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my $sleep = 0; |
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160
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if($self->{lastrequest}) { |
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my $dist = time() - $self->{lastrequest}; |
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$sleep = $self->{minreqinterval} - $dist; |
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} |
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if ($sleep > 0) { |
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$self->log(3, "WebSource : temporizing : waiting ", $sleep, " seconds"); |
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sleep($sleep); |
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} |
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$self->{lastrequest} = time(); |
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} |
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171
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=back |
172
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173
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=head1 SEE ALSO |
174
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175
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WebSource::Module |
176
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177
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=cut |
178
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179
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1; |