include /etc/nginx/conf.d/include/init-optional-variables; location / { set $skylink ""; set $path $uri; rewrite_by_lua_block { local cache = ngx.shared.dnslink local cache_value = cache:get(ngx.var.host) if cache_value == nil then local httpc = require("resty.http").new() -- 10.10.10.55 points to dnslink-api service (alias not available when using resty-http) local res, err = httpc:request_uri("http://10.10.10.55:3100/dnslink/" .. ngx.var.host) if err or (res and res.status ~= ngx.HTTP_OK) then -- check whether we can fallback to regular skylink request local match_skylink = ngx.re.match(ngx.var.uri, "^/([a-zA-Z0-9-_]{46}|[a-z0-9]{55})(/.*)?") if match_skylink then ngx.var.skylink = match_skylink[1] ngx.var.path = match_skylink[2] or "/" else ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status ngx.header["content-type"] = "text/plain" ngx.say(err or res.body) ngx.exit(ngx.status) end else ngx.var.skylink = res.body local cache_ttl = 300 -- 5 minutes cache expire time cache:set(ngx.var.host, ngx.var.skylink, cache_ttl) end else ngx.var.skylink = cache_value end ngx.var.skylink_v1 = ngx.var.skylink ngx.var.skylink_v2 = ngx.var.skylink } include /etc/nginx/conf.d/include/location-skylink; }