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node-red/nodes/core/core/89-delay.js
2015-12-02 15:37:36 +00:00

198 lines
7.5 KiB
JavaScript

/**
* Copyright 2013, 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.
**/
//Simple node to introduce a pause into a flow
module.exports = function(RED) {
"use strict";
var MILLIS_TO_NANOS = 1000000;
var SECONDS_TO_NANOS = 1000000000;
function DelayNode(n) {
RED.nodes.createNode(this,n);
this.pauseType = n.pauseType;
this.timeoutUnits = n.timeoutUnits;
this.randomUnits = n.randomUnits;
this.rateUnits = n.rateUnits;
if (n.timeoutUnits === "milliseconds") {
this.timeout = n.timeout;
} 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);
} else { // Default to seconds
this.timeout = n.timeout * 1000;
}
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;
} else { // Default to seconds
this.rate = 1000/n.rate;
}
if (n.randomUnits === "milliseconds") {
this.randomFirst = n.randomFirst * 1;
this.randomLast = n.randomLast * 1;
} else if (n.randomUnits === "minutes") {
this.randomFirst = n.randomFirst * (60 * 1000);
this.randomLast = n.randomLast * (60 * 1000);
} else if (n.randomUnits === "hours") {
this.randomFirst = n.randomFirst * (60 * 60 * 1000);
this.randomLast = n.randomLast * (60 * 60 * 1000);
} else if (n.randomUnits === "days") {
this.randomFirst = n.randomFirst * (24 * 60 * 60 * 1000);
this.randomLast = n.randomLast * (24 * 60 * 60 * 1000);
} else { // Default to seconds
this.randomFirst = n.randomFirst * 1000;
this.randomLast = n.randomLast * 1000;
}
this.diff = this.randomLast - this.randomFirst;
this.name = n.name;
this.idList = [];
this.buffer = [];
this.intervalID = -1;
this.randomID = -1;
this.lastSent = null;
this.drop = n.drop;
var node = this;
if (this.pauseType === "delay") {
this.on("input", function(msg) {
var id;
id = setTimeout(function() {
node.idList.splice(node.idList.indexOf(id),1);
if (node.idList.length === 0) { node.status({}); }
node.send(msg);
}, node.timeout);
this.idList.push(id);
if ((node.timeout > 1000) && (node.idList.length !== 0)) {
node.status({fill:"blue",shape:"dot",text:" "});
}
});
this.on("close", function() {
for (var i=0; i<this.idList.length; i++ ) {
clearTimeout(this.idList[i]);
}
this.idList = [];
this.status({});
});
} else if (this.pauseType === "rate") {
this.on("input", function(msg) {
if (!node.drop) {
if ( node.intervalID !== -1) {
node.buffer.push(msg);
if (node.buffer.length > 0) {
node.status({text:node.buffer.length});
}
if (node.buffer.length > 1000) {
node.warn(this.name + " " + RED._("delay.error.buffer"));
}
} else {
node.send(msg);
node.intervalID = setInterval(function() {
if (node.buffer.length === 0) {
clearInterval(node.intervalID);
node.intervalID = -1;
node.status({});
}
if (node.buffer.length > 0) {
node.send(node.buffer.shift());
node.status({text:node.buffer.length});
}
},node.rate);
}
} else {
var timeSinceLast;
if (node.lastSent) {
timeSinceLast = process.hrtime(node.lastSent);
}
if (!node.lastSent) { // ensuring that we always send the first message
node.lastSent = process.hrtime();
node.send(msg);
} else if ( ( (timeSinceLast[0] * SECONDS_TO_NANOS) + timeSinceLast[1] ) > (node.rate * MILLIS_TO_NANOS) ) {
node.lastSent = process.hrtime();
node.send(msg);
}
}
});
this.on("close", function() {
clearInterval(this.intervalID);
this.buffer = [];
node.status({});
});
} else if (this.pauseType === "queue") {
this.intervalID = setInterval(function() {
if (node.buffer.length > 0) {
node.send(node.buffer.shift()); // send the first on the queue
}
node.status({text:node.buffer.length});
},node.rate);
this.on("input", function(msg) {
if (!msg.hasOwnProperty("topic")) { msg.topic = "_none_"; }
var hit = false;
for (var b in node.buffer) { // check if already in queue
if (msg.topic === node.buffer[b].topic) {
node.buffer[b] = msg; // if so - replace existing entry
hit = true;
}
}
if (!hit) { node.buffer.push(msg); } // if not add to end of queue
node.status({text:node.buffer.length});
});
this.on("close", function() {
clearInterval(this.intervalID);
this.buffer = [];
node.status({});
});
} else if (this.pauseType === "random") {
this.on("input", function(msg) {
var wait = node.randomFirst + (node.diff * Math.random());
var id = setTimeout(function() {
node.idList.splice(node.idList.indexOf(id),1);
node.send(msg);
}, wait);
this.idList.push(id);
});
this.on("close", function() {
for (var i=0; i<this.idList.length; i++ ) {
clearTimeout(this.idList[i]);
}
this.idList = [];
});
}
}
RED.nodes.registerType("delay",DelayNode);
}