| -- |
| -- Licensed to the Apache Software Foundation (ASF) under one or more |
| -- contributor license agreements. See the NOTICE file distributed with |
| -- this work for additional information regarding copyright ownership. |
| -- The ASF licenses this file to You under the Apache License, Version 2.0 |
| -- (the "License"); you may not use this file except in compliance with |
| -- the License. You may obtain a copy of the License at |
| -- |
| -- http://www.apache.org/licenses/LICENSE-2.0 |
| -- |
| -- Unless required by applicable law or agreed to in writing, software |
| -- distributed under the License is distributed on an "AS IS" BASIS, |
| -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| -- See the License for the specific language governing permissions and |
| -- limitations under the License. |
| -- |
| |
| --- Wrapped serialization and deserialization modules for json and lua tables. |
| -- |
| -- @module core.json |
| |
| local cjson = require("cjson.safe") |
| local json_encode = cjson.encode |
| local clear_tab = require("table.clear") |
| local ngx = ngx |
| local tostring = tostring |
| local type = type |
| local pairs = pairs |
| local cached_tab = {} |
| |
| |
| cjson.decode_array_with_array_mt(true) |
| local _M = { |
| version = 0.1, |
| array_mt = cjson.array_mt, |
| decode = cjson.decode, |
| -- This method produces the same encoded string when the input is not changed. |
| -- Different calls with cjson.encode will produce different string because |
| -- it doesn't maintain the object key order. |
| stably_encode = require("dkjson").encode |
| } |
| |
| |
| local function serialise_obj(data) |
| if type(data) == "function" or type(data) == "userdata" |
| or type(data) == "cdata" |
| or type(data) == "table" then |
| return tostring(data) |
| end |
| |
| return data |
| end |
| |
| |
| local function tab_clone_with_serialise(data) |
| if type(data) ~= "table" then |
| return serialise_obj(data) |
| end |
| |
| local t = {} |
| for k, v in pairs(data) do |
| if type(v) == "table" then |
| if cached_tab[v] then |
| t[serialise_obj(k)] = tostring(v) |
| else |
| cached_tab[v] = true |
| t[serialise_obj(k)] = tab_clone_with_serialise(v) |
| end |
| |
| else |
| t[serialise_obj(k)] = serialise_obj(v) |
| end |
| end |
| |
| return t |
| end |
| |
| |
| local function encode(data, force) |
| if force then |
| clear_tab(cached_tab) |
| data = tab_clone_with_serialise(data) |
| end |
| |
| return json_encode(data) |
| end |
| _M.encode = encode |
| |
| |
| local delay_tab = setmetatable({data = "", force = false}, { |
| __tostring = function(self) |
| local res, err = encode(self.data, self.force) |
| if not res then |
| ngx.log(ngx.WARN, "failed to encode: ", err, |
| " force: ", self.force) |
| end |
| |
| return res |
| end |
| }) |
| |
| |
| --- |
| -- Delayed encoding of input data, avoid unnecessary encode operations. |
| -- When really writing logs, if the given parameter is table, it will be converted to string in |
| -- OpenResty by checking if there is a metamethod registered for `__tostring`, and if so, |
| -- calling this method to convert it to string. |
| -- |
| -- @function core.json.delay_encode |
| -- @tparam string|table data The data to be encoded. |
| -- @tparam boolean force Whether to clear the log buffer. |
| -- @treturn table The table with the __tostring function overridden. |
| -- @usage |
| -- core.log.info("conf : ", core.json.delay_encode(conf)) |
| function _M.delay_encode(data, force) |
| delay_tab.data = data |
| delay_tab.force = force |
| return delay_tab |
| end |
| |
| |
| return _M |