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Whakarahihia nga whakaahua ma te rere ma te Nginx me te LuaJIT (OpenResty)

Mo etahi wa inaianei, i whakaaweahia e te tuhinga Te rahi o nga whakaahua i runga i te rere I whirihorahia te rahi o te ahua ma te whakamahi ngx_http_image_filter_module a ka mahi nga mea katoa kia rite ki te tikanga. Engari ko tetahi raruraru i puta mai i te wa e hiahia ana te kaiwhakahaere ki te tango whakaahua me nga rahi tika mo te tuku ki etahi ratonga, na te mea... ko enei o ratou whakaritenga hangarau. Hei tauira, ki te whai tatou i te ahua taketake o te rahi 1200 × 1200, a ka huri te rahi ka tuhia e matou tetahi mea penei ?rahi=600×400, katahi ka whiwhi tatou i te ahua kua whakahekehia ki te taha iti rawa, te rahi 400 × 400. Kare hoki e taea te tiki whakaahua me te taumira teitei ake (whakaekea). Ko era. ?rahi=1500×1500 ka whakahokia te ahua ano 1200 × 1200

I puta mai tenei tuhinga ki te whakaora OpenResty: te huri i te NGINX hei tūmau tono tino kia mohio ki te mahi a Nginx ki a Lua me te whare pukapuka ake mo Lua isage/lua-imagick - Ko nga hononga a Lua pure-c ki ImageMagick. He aha te take i whiriwhiria ai tenei otinga, kaore, me kii, he mea kei roto i te python - na te mea he tere me te watea. Kaore koe e hiahia ki te hanga i etahi konae, kei te tika nga mea katoa i roto i te whirihora Nginx (he kowhiringa).

Na he aha ta tatou e hiahia ai

Ka hoatu nga tauira i runga i a Debian.

Te whakauru i te nginx me te nginx-extras

apt-get update
apt-get install nginx-extras

Tāuta LuaJIT

apt-get -y install lua5.1 luajit-5.1 libluajit-5.1-dev

Tāuta imagemagick

apt-get -y install imagemagick

me nga whare pukapuka makutu ki tera, i taku keehi mo te putanga 6

apt-cache search libmagickwand
apt-get -y install libmagickwand-6.q16-3 libmagickwand-6.q16-dev

Te hanga lua-whakaaro

Ka katihia e matou te putunga (ka tango ranei i te zip ka wetewete)

cd ~
git clone https://github.com/isage/lua-imagick.git
cd lua-imagick
mkdir build
cd build
cmake ..
make
make install

Mena i pai nga mea katoa, ka taea e koe te whirihora i a Nginx.

Ka hoatu e ahau he tauira o te whirihora o te kaihautu o muri, ko te tikanga, ko te kawenga mo te whakarereke i te rahi. Ka tukuna e te tūmau o mua, me Nginx hoki, kei reira te keteroki mo etahi wa (ra) me etahi atu mea.

nginx backend whirihora

# Backend image server
server {
    listen       8082;
    listen [::]:8082;
    set $files_root /var/www/example.lh/frontend/web;
    root $files_root;
    access_log off;
    expires 1d;

    location /files {
        # дефолтные значения ресайза
        set $w 700;
        set $h 700;
        set $q 89;

        #1-89 allowed
        if ($arg_q ~ "^([1-9]|[1-8][0-9])$") {
            set $q $arg_q;
        }

        if ($arg_resize ~ "([d-]+)x([d+!^]+)") {  
            set $w $1;
            set $h $2;
            rewrite  ^(.*)$   /resize/$w/$h/$q$uri     last;
        }

        rewrite  ^(.*)$   /resize/$w/$h/$q$uri     last;
    }

    location ~* ^/resize/([d]+)/([d+!^]+)/([d]+)/files/(.+)$ {
        default_type 'text/plain';

        set $w $1;
        set $h $2;
        set $q $3;
        set $fname $4;

        # Есть возможность вынести весь Lua код в отдельный файл
        # content_by_lua_file /var/www/some.lua;
        # lua_code_cache off; #dev
        content_by_lua '
        local magick = require "imagick"
        local img = magick.open(ngx.var.files_root .. "/files/" .. ngx.var.fname)
        if not img then ngx.exit(ngx.HTTP_NOT_FOUND) end
        img:set_gravity(magick.gravity["CenterGravity"])

        if string.match(ngx.var.h, "%d+%+") then
            local h = string.gsub(ngx.var.h, "(%+)", "")
            resize = ngx.var.w .. "x" .. h
            -- для png с альфа каналом
            img:set_bg_color(img:has_alphachannel() and "none" or img:get_bg_color())
            img:smart_resize(resize)
            img:extent(ngx.var.w, h)
        else
                img:smart_resize(ngx.var.w .. "x" .. ngx.var.h)
        end

        if ngx.var.arg_q then img:set_quality(ngx.var.q) end

        ngx.say(img:blob())
        ';
    }
}

# Upstream
upstream imageserver {
    server localhost:8082;
}

server {
    listen 80;
    server_name examaple.lh;

    # отправляем все jpg и png картинки на imageserver
    location ~* ^/files/.+.(jpg|png) {
        proxy_buffers 8 2m;
        proxy_buffer_size 10m;
        proxy_busy_buffers_size 10m;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_pass     http://imageserver;  # Backend image server
    }
}

Ko nga mea e hiahiatia ana (te whakaroa i te ahua huri noa i nga tapa) ka mahia img:extent() ka tautuhia ma te whakamahi i te tawhā resize me te tohu + i te mutunga.

Kei te waatea nga whiringa e whai ake nei:

  • WxH (Pupurihia te ōwehenga-a-hua, whakamahia te rahinga teitei)
  • WxH^ (Pupurihia te owehenga-a-waha, whakamahia te taha whakararo (tipu))
  • WxH! (Kaua e arohia te owehenga-a-hua)
  • WxH+ (Pūmau i te ōwehenga-āhuatanga, tāpirihia ngā taitapa taha)

Ripanga whakarapopototanga me nga hua whakarereke

Tonoa tawhā uri
Rahi Whakaahua Huaputa

?rahi=400×200
200 × 200

?rahi=400×200^
400 × 400

?rahi=400×200!
400×200 (Kāore i te taurite)

?rahi=400×200+
400×200 (Waihanga)

Whakarahihia nga whakaahua ma te rere ma te Nginx me te LuaJIT (OpenResty)

Ko te hua

Ma te whakaaro ki te kaha me te ngawari o tenei huarahi, ka taea e koe te whakatinana i nga mea me te arorau tino uaua, hei tauira, te taapiri tohuwai, te whakatinana whakamanatanga me te iti o te uru. Kia mohio ai koe ki nga kaha o te API mo te mahi me nga whakaahua, ka taea e koe te korero ki nga tuhinga whare pukapuka isage/lua-imagick

Source: will.com

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