init commit

plugins/ctx.lua

@@ -0,0 +1,46 @@
+local _M = { version = 0.2 }
+
+local function get_client_ip(stream)
+    local ip = stream:downstreamLocalAddress()
+    if ip then
+        return ip
+    end
+
+    ip = stream:downstreamDirectRemoteAddress()
+    if ip then
+        return ip
+    end
+end
+
+function _M.set_vars_meta(handle)
+    local stream = handle:streamInfo()
+    local meta = stream:dynamicMetadata()
+
+    local var = {}
+    var._cache = meta:get("envoy.filters.http.lua") or {}
+    var.remote_addr = get_client_ip(stream)
+
+    setmetatable(var, {
+        __index = function(self, key)
+            local cached = self._cache[key]
+            if cached ~= nil then
+                return cached
+            end
+
+            return nil
+        end,
+
+        __newindex = function(self, key, val)
+            meta:set("envoy.filters.http.lua", key, val)
+            self._cache[key] = val
+        end,
+
+        __pairs = function (self)
+            return next, self._cache, nil
+        end,
+    })
+
+    return var
+end
+
+return _M