feat: lookup from Host header for default host

src/lua/config.lua

@@ -4,8 +4,32 @@ local redis = require "resty.redis"
 
 local _M = {}
 
+local function get_default_host(host)
+    local cache = ngx.shared.jasima_cache
+    local cache_key = "default:" .. host
+    local cached = cache:get(cache_key)
+    if cached then return cached end
+
+    local red = redis:new()
+    red:set_timeout(1000)
+    local ok, err = red:connect("redis", 6379)
+    if not ok then return nil, "Redis connect failed: " .. err end
+
+    local key = "jasima:default:" .. host
+    local res, err = red:get(key)
+    if not res or res == ngx.null then return nil, "No default in Redis" end
+
+    red:set_keepalive(10000, 100)
+
+    cache:set(cache_key, res, 60)
+    return res
+end
+
 function _M.get_jasima_host()
     local headers = ngx.req.get_headers()
+    if headers["Cf-Ray"] and headers["Host"] then
+        return get_default_host(headers["Host"])
+    end
     if headers["Jasima-Host"] then
         return headers["Jasima-Host"]
     end