Chithunzi chikuchulukirachulukira

Pafupifupi pulogalamu iliyonse yapaintaneti yomwe imagwiritsa ntchito zithunzi, pamafunika kupanga makope ang'onoang'ono a zithunzizi, ndipo nthawi zambiri pamakhala mawonekedwe angapo azithunzi zowonjezera.
Kuwonjezera miyeso yatsopano ku pulogalamu yomwe ilipo kumayambitsanso mutu wina. Chifukwa chake ntchito:

Cholinga

Tiyeni titchule mndandanda wa zofunika:

• Pangani zithunzi zowonjezera zamawonekedwe aliwonse pa ntchentche popanda kuyika zina zowonjezera pakugwiritsa ntchito nthawi iliyonse mukamagwiritsa ntchito;
• Zithunzi zowonjezera siziyenera kupangidwa pazopempha zilizonse;
• Letsani kuthekera kopanga zithunzi zowonjezera zamawonekedwe osadziwika.

Ndifotokoza mfundo yotsiriza, chifukwa imatsutsana pang'ono ndi mfundo yoyamba. Ngati tipanga m'badwo wa zithunzi zilizonse kutseguka, ndiye kuti pali kuthekera kwa kuwukira patsambalo popanga zopempha zambiri kuti musinthe kukula kwa chithunzicho kukhala mawonekedwe osawerengeka, ndiye kuti chiwopsezochi chiyenera kutsekedwa.

kukhazikitsidwa kwa nginx

Kuti tithane ndi zomwe zili pamwambapa timafunikira ma module awa a nginx:

• ngx_http_image_filter_module - pakusintha kukula kwa zithunzi;
• ngx_http_proxy_module - kwa caching;
• ngx_http_secure_link_module - kuteteza ku spam;

Ma module ngx_http_image_filter_module и ngx_http_secure_link_module sizinayikidwe mwachisawawa, chifukwa chake ziyenera kufotokozedwa pagawo lokonzekera nginx:

phoinix@phoinix-work:~/src/nginx-0.8.29
$ ./configure --with-http_secure_link_module --with-http_image_filter_module


nginx kasinthidwe

Timawonjezera chatsopano ku kasinthidwe kathu kolandira malo ndi magawo onse a cache:

...
    proxy_cache_path /www/myprojects/cache levels=1:2 keys_zone=image-preview:10m;
...
    server {
...
        location ~ ^/preview/([cir])/(.+) {
        # Тип операции
            set                         $oper $1;
        # Параметры изображения и путь к файлу
            set                         $remn $2;
        # Проксируем на отдельный хост
            proxy_pass                  http://myproject.ru:81/$oper/$remn;
            proxy_intercept_errors      on;
            error_page                  404 = /preview/404;
        # Кеширование
            proxy_cache                 image-preview;
            proxy_cache_key             "$host$document_uri";
        # 200 ответы кешируем на 1 день
            proxy_cache_valid           200 1d;
        # остальные ответы кешируем на 1 минуту
            proxy_cache_valid           any 1m;
        }
        
        # Возвращаем ошибку
        location = /preview/404 {
            internal;
            default_type                image/gif;
            alias                       /www/myprojects/image/noimage.gif;
        }
...
    }
...


Timawonjezeranso wolandila watsopano ku config:

server {
    server_name                     myproject.ru;
    listen                          81;

    access_log                      /www/myproject.ru/logs/nginx.preview.access_log;
    error_log                       /www/myproject.ru/logs/nginx.preview.error_log info;

    # Указываем секретное слово для md5
    secure_link_secret              secret;

    # Ошибки отправляем она отдельный location
    error_page                      403 404 415 500 502 503 504 = @404;

    # location Для фильтра size
    location ~ ^/i/[^/]+/(.+) {
        
        # грязный хак от Игоря Сысоева *
        alias                       /www/myproject.ru/images/$1;
        try_files                   "" @404;
    
        # Проверяем правильность ссылки и md5
        if ($secure_link = "") { return 404; }
        
        # Используем соответсвующий фильтр
        image_filter                size;
    }

    # По аналогии остальные location для других фильтров
    location ~ ^/c/[^/]+/(d+|-)x(d+|-)/(.+) {
        set                         $width  $1;
        set                         $height $2;
        
        alias                       /www/myproject.ru/images/$3;
        try_files                   "" @404;
    
        if ($secure_link = "") { return 404; }
    
        image_filter                crop  $width  $height;
    }
    
    location ~ ^/r/[^/]+/(d+|-)x(d+|-)/(.+) {
        set                         $width  $1;
        set                         $height $2;

        alias                       /www/myproject.ru/images/$3;
        try_files                   "" @404;

        if ($secure_link = "") { return 404; }

        image_filter                resize  $width  $height;
    }

    location @404 { return 404; }
}


Zotsatira zake, zithunzi zowonjezera zitha kupezeka pogwiritsa ntchito maulalo awa:

• myproject.ru/preview/i[md5]/[path_to_image]
• myproject.ru/preview/c[md5]/[size]/[path_to_image]
• myproject.ru/preview/r[md5]/[size]/[path_to_image]

* try_files - tcheru ku malo ndi zilembo za Chirasha, kotero ndimayenera kupanga ndodo alias.

Gwiritsani ntchito pa intaneti

Pamlingo wogwiritsa ntchito intaneti, mutha kuchita izi (Perl):

sub proxy_image {
    use Digest::MD5     qw /md5_hex/;
    my %params = @_;
    my $filter = {
                    size    => 'i',
                    resize  => 'r',
                    crop    => 'c'            
                  }->{$params{filter}} || 'r';
    my $path = ($filter ne 'i' ?
                    ( $params{height} || '_' ) . 'x' . ( $params{width} || '_' ) . '/' :
                    ()
               ) . $params{source};
    my $md5 = md5_hex( $path . 'secret' );
    $path = '/preview/' . $filter . '/' . $md5 . '/' . $path;
    return $path;
}

my $preview_path = &proxy_image(
                    source  => 'image1.jpg',
                    height  => 100,
                    width   => 100,
                    filter  => 'resize'
                );


Ngakhale ndingalimbikitsenso kuwerengera kukula kwake chithunzithunzi.

Makoswe

Mukachotsa chithunzi choyambirira, zowonetseratu, mwachibadwa, sizidzachotsedwa ku cache mpaka cache itachotsedwa, ndipo kwa ife, zowonetseratu zikhoza kukhalapo kwa tsiku limodzi pambuyo pochotsa, koma iyi ndi nthawi yochuluka.

choyambirira

Source: www.habr.com