nginx-site-default.conf

lua_shared_dict wrr 10m;

server {
	listen 80 default_server;
	listen [::]:80 default_server;

	root /var/www/html;

	index index.html index.htm index.nginx-debian.html;

	server_name rtr.mdthk.de;

	location / {
		try_files $uri $uri/ =404;
	}

	location /Filmliste-akt.xz {
        access_by_lua '
            ngx.ctx.srvs = {}
            ngx.ctx.srvs[0] = "http://verteiler1.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[1] = "http://verteiler2.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[2] = "http://verteiler3.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[3] = "http://verteiler4.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[4] = "http://verteiler5.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[5] = "http://verteiler6.mediathekview.de/Filmliste-akt.xz"
            ngx.ctx.srvs[6] = "https://verteiler.mediathekviewweb.de/Filmliste-akt.xz"
            ngx.ctx.srvs[7] = "https://verteiler2.mediathekviewweb.de/Filmliste-akt.xz"

            ngx.ctx.weights = {}
            ngx.ctx.weights[0] = 4
            ngx.ctx.weights[1] = 2
            ngx.ctx.weights[2] = 4
            ngx.ctx.weights[3] = 2
            ngx.ctx.weights[4] = 4
            ngx.ctx.weights[5] = 4
            ngx.ctx.weights[6] = 2
            ngx.ctx.weights[7] = 2

            if ngx.shared.wrr:get("i") == nil then
                ngx.shared.wrr:set("i", -1)
            end
            if ngx.shared.wrr:get("cw") == nil then
                ngx.shared.wrr:set("cw", 0)
            end
        ';
        content_by_lua '
            local function max(a)
                local max = -1
                for k in pairs(a) do
                    if a[k] > max then
                        max = a[k]
                    end
                end
                return max
            end

            local function gcd(a)
                local function gcd(m, n)
                    while m ~= 0 do
                        m, n = (n % m), m;
                    end
                    return n;
                end

                local m = 0
                for k in pairs(a) do
                    m = gcd(m, a[k])
                end
                return m
            end

            local function wrr()
                while true do
                    ngx.shared.wrr:set("i", (ngx.shared.wrr:get("i") + 1) % 8)
                    if ngx.shared.wrr:get("i") == 0 then
                        ngx.shared.wrr:set("cw", ngx.shared.wrr:get("cw") - gcd(ngx.ctx.weights))
                        if  ngx.shared.wrr:get("cw") <= 0 then
                            ngx.shared.wrr:set("cw", max(ngx.ctx.weights))
                            if  ngx.shared.wrr:get("cw") == 0 then
                                return nil
                            end
                        end
                    end
                    if ngx.ctx.weights[ngx.shared.wrr:get("i")] >= ngx.shared.wrr:get("cw") then
                        return ngx.ctx.srvs[ngx.shared.wrr:get("i")]
                    end
                end
            end

            ngx.redirect(wrr(), 302)
        ';
	}
}