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node-red/nodes/core/89-delay.js

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/**
* Copyright 2013 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.
**/
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// Simple node to introduce a pause into a flow
var RED = require("../../red/red");
function DelayNode(n) {
RED.nodes.createNode(this,n);
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this.pauseType = n.pauseType;
this.timeoutUnits = n.timeoutUnits;
this.rateUnits = n.rateUnits;
if (n.timeoutUnits == "milliseconds") {
this.timeout = n.timout;
} else if (n.timeoutUnits == "seconds") {
this.timeout = n.timeout * 1000;
} else if (n.timeoutUnits == "minutes") {
this.timeout = n.timeout * (60 * 1000);
} else if (n.timeoutUnits == "hours") {
this.timeout = n.timeout * (60 * 60 * 1000);
} else if (n.timeoutUnits == "days") {
this.timeout = n.timeout * (24 * 60 * 60 * 1000);
}
if (n.rateUnits == "second") {
this.rate = 1000/n.rate;
} else if (n.rateUnits == "minute") {
this.rate = (60 * 1000)/n.rate;
} else if (n.rateUnits == "hour") {
this.rate = (60 * 60 * 1000)/n.rate;
} else if (n.rateUnits == "day") {
this.rate = (24 * 60 * 60 * 1000)/n.rate;
}
this.name = n.name;
this.idList = [];
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this.buffer = [];
this.intervalID = -1;
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var node= this;
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if (this.pauseType == "delay") {
this.on("input", function(msg) {
var node= this;
var id;
id = setTimeout(function(){
node.idList.splice(node.idList.indexOf(id),1);
node.send(msg);
}, node.timeout);
this.idList.push(id);
});
this.on("close", function() {
for (var i=0; i<this.idList.length; i++ ) {
clearTimeout(this.idList[i]);
}
this.idList = [];
});
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} else if (this.pauseType == "rate") {
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this.on("input", function(msg) {
if ( node.intervalID != -1) {
node.buffer.push(msg);
if (node.buffer.length > 1000) {
node.warn(this.name + " buffer exceeded 1000 messages");
}
} else {
node.send(msg);
node.intervalID = setInterval(function() {
if (node.buffer.length == 0) {
clearInterval(node.intervalID);
node.intervalID = -1;
}
if (node.buffer.length > 0) {
node.send(node.buffer.shift());
}
},node.rate);
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}
});
this.on("close", function() {
clearInterval(this.intervalID);
this.buffer = [];
});
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}
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}
RED.nodes.registerType("delay",DelayNode);