Hlaziya ubungakanani bemifanekiso kubhabho

Phantse nasiphi na isicelo sewebhu esisebenzisa imifanekiso, kukho imfuneko yokwenza iikopi ezincinci zale mifanekiso, kwaye kaninzi kukho iifomati ezininzi zemifanekiso eyongezelelweyo.
Ukongeza imilinganiselo emitsha kwisicelo esele sikhona kubangela iintloko ezibuhlungu. Ngoko ke umsebenzi:

Injongo

Masibonise uluhlu lweemfuno:

• Yenza imifanekiso eyongezelelweyo yayo nayiphi na ifomathi kwi-fly ngaphandle kokwazisa ukusebenza okongeziweyo kwisicelo nangaliphi na ixesha ngexesha lobukho besicelo;
• Imifanekiso eyongezelelweyo ayifuni ukuba yenziwe kwisicelo ngasinye;
• Khubaza ukukwazi ukwenza imifanekiso eyongezelelweyo yeefomati ezingachazwanga.

Ndiza kucacisa inqaku lokugqibela, kuba liphikisana nenqaku lokuqala. Ukuba senza isizukulwana sayo nayiphi na imifanekiso evulekileyo, ngoko kukho ithuba lokuhlaselwa kwisayithi ngokuvelisa inani elikhulu lezicelo zokutshintsha ubungakanani bomfanekiso kwinani elingenasiphelo lefomathi, ngoko ke lo mngcipheko kufuneka uvalwe.

nginx uqwalaselo lofakelo

Ukusombulula ezi mfuno zingasentla sifuna le seti ilandelayo yeemodyuli ze-nginx:

• ngx_http_image_isihluzi_modyuli - yokutshintsha ubungakanani bemifanekiso;
• ngx_http_proxy_modyuli - kwi-caching;
• ngx_http_secure_link_modyuli - ukukhusela kwi-spam;

I modyuli ngx_http_image_isihluzi_modyuli и ngx_http_secure_link_modyuli azifakwanga ngokungagqibekanga, ngoko ke kufuneka zichazwe kwinqanaba loqwalaselo lofakelo nginx:

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


nginx uqwalaselo

Songeza entsha kuqwalaselo lwethu lokusingatha indawo kunye neeparamitha ze-cache ngokubanzi:

...
    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;
        }
...
    }
...


Sikwangeza umamkeli omtsha kuqwalaselo:

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; }
}


Ngenxa yoko, imifanekiso eyongezelelweyo inokufumaneka kusetyenziswa la makhonkco alandelayo:

• myproject.ru/preview/i[md5]/[indlela_ye_umfanekiso]
• myproject.ru/preview/c[md5]/[ubukhulu]/[indlela_to_image]
• myproject.ru/preview/r[md5]/[ubukhulu]/[indlela_to_image]

* zama_iifayile - ubuthathaka kwizithuba kunye nabalinganiswa baseRashiya, ngoko ke kwafuneka ndenze intonga ogama limbi.

Sebenzisa kwisicelo sewebhu

Kwinqanaba lesicelo sewebhu, unokwenza le nkqubo ilandelayo (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'
                );


Nangona ndingaphinda ndicebise ukubala ubungakanani yemboniso.

Qhekeza

Xa ucima umfanekiso wokuqala, ukujonga kuqala, ngokwemvelo, akuyi kususwa kwi-cache de i-cache ingasebenzi, kwaye kwimeko yethu, ukujonga kuqala kunokubakho ngosuku emva kokususwa, kodwa eli lixesha eliphezulu.

eyokuqala

umthombo: www.habr.com