Add support for server protocol stack API in lua plugin

doc/admin-guide/plugins/lua.en.rst

@@ -299,6 +299,46 @@ Here is an example:
 
 :ref:`TOP <admin-plugins-ts-lua>`
 
+ts.status
+---------
+**syntax:** *ts.status(MESSAGE)*
+
+**context:** global
+
+**description**: Log the MESSAGE to error.log as status
+
+:ref:`TOP <admin-plugins-ts-lua>`
+
+ts.note
+-------
+**syntax:** *ts.note(MESSAGE)*
+
+**context:** global
+
+**description**: Log the MESSAGE to error.log as note
+
+:ref:`TOP <admin-plugins-ts-lua>`
+
+ts.warning
+----------
+**syntax:** *ts.warning(MESSAGE)*
+
+**context:** global
+
+**description**: Log the MESSAGE to error.log as warning
+
+:ref:`TOP <admin-plugins-ts-lua>`
+
+ts.alert
+--------
+**syntax:** *ts.alert(MESSAGE)*
+
+**context:** global
+
+**description**: Log the MESSAGE to error.log as alert
+
+:ref:`TOP <admin-plugins-ts-lua>`
+
 TS Basic Internal Information
 -----------------------------
 **syntax:** *ts.get_install_dir()*
@@ -2770,6 +2810,28 @@ Here is an example:
 
 :ref:`TOP <admin-plugins-ts-lua>`
 
+ts.http.get_server_protocol_stack
+---------------------------------
+**syntax:** *ts.http.get_server_protocol_stack()*
+
+**context:** do_global_read_response or later
+
+**description:** This function can be used to get server protocol stack information
+
+Here is an example:
+
+::
+
+    function do_global_read_response()
+        local stack = {ts.http.get_server_protocol_stack()}
+        for k,v in pairs(stack) do
+          ts.debug(v)
+        end
+        return 0
+    end
+
+:ref:`TOP <admin-plugins-ts-lua>`
+
 ts.http.server_push
 -------------------
 **syntax:** *ts.http.server_push()*

plugins/lua/ts_lua_http.c

@@ -85,6 +85,7 @@ static int ts_lua_http_resp_cache_transformed(lua_State *L);
 static int ts_lua_http_resp_cache_untransformed(lua_State *L);
 
 static int ts_lua_http_get_client_protocol_stack(lua_State *L);
+static int ts_lua_http_get_server_protocol_stack(lua_State *L);
 static int ts_lua_http_server_push(lua_State *L);
 static int ts_lua_http_is_websocket(lua_State *L);
 static int ts_lua_http_get_plugin_tag(lua_State *L);
@@ -218,6 +219,9 @@ ts_lua_inject_http_misc_api(lua_State *L)
   lua_pushcfunction(L, ts_lua_http_get_client_protocol_stack);
   lua_setfield(L, -2, "get_client_protocol_stack");
 
+  lua_pushcfunction(L, ts_lua_http_get_server_protocol_stack);
+  lua_setfield(L, -2, "get_server_protocol_stack");
+
   lua_pushcfunction(L, ts_lua_http_server_push);
   lua_setfield(L, -2, "server_push");
 
@@ -654,6 +658,23 @@ ts_lua_http_get_client_protocol_stack(lua_State *L)
   return count;
 }
 
+static int
+ts_lua_http_get_server_protocol_stack(lua_State *L)
+{
+  char const *results[10];
+  int count = 0;
+  ts_lua_http_ctx *http_ctx;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  TSHttpTxnServerProtocolStackGet(http_ctx->txnp, 10, results, &count);
+  for (int i = 0; i < count; i++) {
+    lua_pushstring(L, results[i]);
+  }
+
+  return count;
+}
+
 static int
 ts_lua_http_server_push(lua_State *L)
 {