lua randomseed per worker

rootfs/etc/nginx/lua/lua_ingress.lua

@@ -0,0 +1,26 @@
+local _M = {}
+
+local seeds = {}
+local original_randomseed = math.randomseed
+math.randomseed = function(seed)
+  local pid = ngx.worker.pid()
+
+  if seeds[pid] then
+    ngx.log(ngx.WARN,
+      string.format("ignoring math.randomseed(%d) since PRNG is already seeded for worker %d", seed, pid))
+    return
+  end
+
+  original_randomseed(seed)
+  seeds[pid] = seed
+end
+
+local function randomseed()
+  math.randomseed(ngx.time() + ngx.worker.pid())
+end
+
+function _M.init_worker()
+  randomseed()
+end
+
+return _M