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node-red-nodes/parsers/msgpack/70-msgpack.js

47 lines
1.6 KiB
JavaScript

/**
* Copyright 2014 IBM Corp.
*
* Licensed 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.
**/
module.exports = function(RED) {
"use strict";
var msgpack = require('msgpack-js');
function MsgPackNode(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input", function(msg) {
if (Buffer.isBuffer(msg.payload)) {
var l = msg.payload.length;
try {
msg.payload = msgpack.decode(msg.payload);
node.send(msg);
node.status({text:l +" b->o "+ JSON.stringify(msg.payload).length});
}
catch (e) {
node.warn("Bad decode: "+e);
node.status({text:"not a msgpack buffer"});
}
}
else {
var le = JSON.stringify(msg.payload).length;
msg.payload = msgpack.encode(msg.payload);
node.send(msg);
node.status({text:le +" o->b "+ msg.payload.length});
}
});
}
RED.nodes.registerType("msgpack",MsgPackNode);
}