Created
December 17, 2014 11:03
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やや現代風にカウンターを実装してみる Hokkaido.pm Casual#32
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#!/usr/bin/env perl | |
use Mojolicious::Lite; | |
use Image::Magick; | |
use Redis; | |
get '/' => sub { | |
my $c = shift; | |
$c->render('index'); | |
}; | |
get '/counter' => sub { | |
my $c = shift; | |
# アトミックなカウンターを実装するのは骨が折れるのでredisを使う | |
my $redis = Redis->new; | |
my $count = $redis->incr('counter'); | |
# 桁数分の画像ファイル名を配列に貯めこむ | |
my @files = map {"img/$_.gif"} split //, "$count"; | |
# 桁数分の画像を連結してpngにする | |
my $img = Image::Magick->new; | |
$img->Read(@files); | |
my $mon = $img->Montage(geometry => '+0 +0', tile => scalar @files . 'x1'); | |
my $blob = $mon->ImageToBlob(magick => 'png'); | |
# 画像を出力する | |
$c->render(data=>$blob, format => 'png'); | |
}; | |
app->start; | |
__DATA__ | |
@@ index.html.ep | |
% layout 'default'; | |
% title 'Welcome'; | |
Welcome to the Mojolicious real-time web framework! | |
<br> | |
<img src="counter"> | |
@@ layouts/default.html.ep | |
<!DOCTYPE html> | |
<html> | |
<head><title><%= title %></title></head> | |
<body><%= content %></body> | |
</html> |
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