Rename controller to nginx

controllers/nginx/lua/error_page.lua

@@ -0,0 +1,67 @@
+http = require "resty.http"
+def_backend = "upstream-default-backend"
+
+local concat = table.concat
+local upstream = require "ngx.upstream"
+local get_servers = upstream.get_servers
+local get_upstreams = upstream.get_upstreams
+local random = math.random
+local us = get_upstreams()
+
+function openURL(status)
+    local httpc = http.new()
+
+    local random_backend = get_destination()
+    local res, err = httpc:request_uri(random_backend, {
+        path = "/",
+        method = "GET",
+        headers = {
+            ["X-Code"] = status or "404",
+            ["X-Format"] = ngx.var.httpAccept or "html",
+        }
+    })
+
+    if not res then
+        ngx.log(ngx.ERR, err)
+        ngx.exit(500)
+    end
+
+    if ngx.var.http_cookie then
+        ngx.header["Cookie"] = ngx.var.http_cookie
+    end
+
+    ngx.status = tonumber(status)
+    ngx.say(res.body)
+end
+
+function get_destination()
+    for _, u in ipairs(us) do
+        if u == def_backend then
+            local srvs, err = get_servers(u)
+            local us_table = {}
+            if not srvs then
+                return "http://127.0.0.1:8181"
+            else
+                for _, srv in ipairs(srvs) do
+                    us_table[srv["name"]] = srv["weight"]
+                end
+            end
+            local destination = random_weight(us_table)
+            return "http://"..destination
+        end
+    end
+end
+
+function random_weight(tbl)
+    local total = 0
+    for k, v in pairs(tbl) do
+        total = total + v
+    end
+    local offset = random(0, total - 1)
+    for k1, v1 in pairs(tbl) do
+        if offset < v1 then
+            return k1
+        end
+        offset = offset - v1
+    end
+end