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发表于 2017-09-11 17:53 |只看该作者 |倒序浏览

本帖最后由 523066680 于 2017-09-11 18:03 编辑

数独网站：免费的在线数独

获取题库的地址规律是/printable.php?nd=难度&y=年&m=月&d=日
起点日期是2008-1-1，终点日期是当天，难度分为 0 1 2 3 4
如果$level 设为 0，运行后文件保存在 sudoku_nd0.txt，如果程序中断，再次运行时会加载上次的结果继续下载。

=info
523066680 2017-09
https://zhuanlan.zhihu.com/PerlExample
=cut

use threads;
use threads::shared;
use IO::Handle;
use File::Slurp;
use Data::Dumper;
use Time::HiRes qw/sleep time/;
STDOUT->autoflush(1);

$Data::Dumper::Indent = 1;
$Data::Dumper::Sortkeys = 1;

use Date::Format;
use Time::Local;
use LWP::UserAgent;

our $level = 0;
our $dbfile;
our $main = "http://www.cn.sudokupuzzle.org";
our $ua = LWP::UserAgent->new(
         agent => "Mozilla/5.0", keep_alive => 1, timeout => 5,
      );

our $db :shared;
our @tasks :shared;
my @ths;

while ( $level <= 4 )
{
$dbfile = "sudoku_nd${level}.txt";
$db = undef;
@tasks = ();

#结构初始化，设置任务列表
initdb( \$db, \@tasks, $dbfile );

@ths = ();
grep { push @ths, threads->create( \&getSudoku, $_ ); } (0..4);

#等待并结束线程
while ( threads->list( threads::running ) ) { sleep 1.0 }
grep { $_->detach() } @ths;

#最终数据输出
write_file( $dbfile, Dumper $db );
print "Done $dbfile\n";

$level++;
}

sub getSudoku
{
our ($main, $ua, $level, $db, @tasks);
my $id = shift;
my $html;
my $link;
my $res;
my $timestamp;
my ($year, $mon, $day);

while ( $#tasks >= 0 )
{
      $timestamp = shift @tasks;
      ($year, $mon, $day) = split( " ", time2str( "%Y %L %e", $timestamp ) );
      $link = "$main/printable.php?nd=$level&y=$year&m=$mon&d=$day";
      GET: while (1)
      {
         $res  = $ua->get($link);
         $html = $res->content();

         if ($html=~/(\d{162})/)
         {
            $db->{ $timestamp } = $1;
            printf "[%d %d-%02d-%02d Done\n", $id, $year, $mon, $day;
            last GET;
         }
      }

      #遇到偶数月份零一日的时候保存数据，避免程序中断前功尽弃
      if ( ($day == 1) and ($mon % 2 == 0) )
      {
         write_file( $dbfile, Dumper $db );
      }
}
}

sub initdb
{
our ($main, $level);
my ( $db, $tasks, $dbfile ) = @_;

my $iter = timelocal(0, 0, 0, 1, 0, 2008 );  #起点日期，月份从0开始
my $last = time();                         #最后日期为今天
my %new_db;

my $old_db;
$old_db = eval read_file( $dbfile ) if ( -e $dbfile );

while ( $iter < $last )
{
      if ( defined $old_db->{$iter} )
      {
         $new_db{$iter} = $old_db->{$iter};
      }
      else
      {
         $new_db{$iter} = undef;
         push @$tasks, $iter;
      }

      $iter += 24*3600;
}

$$db = shared_clone( \%new_db );
}