node-red-contrib-simple-gate
Version:
A gate node for node-RED
102 lines (99 loc) • 4.34 kB
JavaScript
/**
* Copyright 2017 M. I. Bell
*
* 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) {
function GateNode(config) {
RED.nodes.createNode(this,config);
const openStatus = {fill:"green",shape:"dot",text:"open"};
const closedStatus = {fill:'red',shape:'ring',text:'closed'};
var status;
// Copy configuration items
this.controlTopic = config.controlTopic.toLowerCase();
this.openCmd = config.openCmd.toLowerCase();
this.closeCmd = config.closeCmd.toLowerCase();
this.toggleCmd = config.toggleCmd.toLowerCase();
this.defaultCmd = config.defaultCmd.toLowerCase();
this.defaultState = config.defaultState.toLowerCase();
this.statusCmd = (config.statusCmd || "status").toLowerCase();
this.persist = config.persist;
this.storeName = config.storeName;
// Save "this" object
var node = this;
var context = node.context();
var persist = node.persist;
var storeName = node.storeName;
context.get('state',storeName,function(err,state){
if (err) {
node.error('startup error reading from context store: ' + storeName)
} else {
if (!persist || typeof state === 'undefined') {
state = node.defaultState;
}
// Initialize status display
status = (state === 'open') ? openStatus:closedStatus
node.status(status)
context.set('state',state,storeName,function(err){
if (err) {
node.error('startup error writing to context store: ' + storeName)
}
})
}
})
node.on('input', function(msg) {
context.get('state',storeName,function(err,state) {
if (err) {
node.error('message error reading from context store: ' + storeName)
} else if (typeof msg.topic === 'string' &&
msg.topic.toLowerCase() === node.controlTopic) { // change state
if (typeof msg.payload === 'undefined' || msg.payload === null) {
msg.payload = '';
}
switch (msg.payload.toString().toLowerCase()) {
case node.openCmd:
state = 'open';
break;
case node.closeCmd:
state = 'closed';
break;
case node.toggleCmd:
if (state === 'open') {
state = 'closed';
} else {
state = 'open';
}
break;
case node.defaultCmd:
state = node.defaultState;
break;
case node.statusCmd:
break;
default:
node.warn('Invalid command ignored');
}
status = (state === 'open') ? openStatus:closedStatus;
node.status(status);
context.set('state',state,storeName,function(err){
if (err){
node.error('message error writing to context store: ' + storeName)
}
});
} else if (state === 'open') { // transmit message
node.send(msg);
}
})
})
}
RED.nodes.registerType("gate",GateNode);
}