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# node-red-contrib-msg-speed
A Node Red node for measuring flow message speed.
## Install
Run the following npm command in your Node-RED user directory (typically ~/.node-red):
```
npm install node-red-contrib-msg-speed
```
## How it works
This node will count all messages that arrive at the input port, and calculate the message speed *every second*.
For example when the frequency is 'minute', it will count all the messages received in the *last minute*:
![Timeline 1](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed1.png)
A second later, the calculation is repeated: again the messages received in the last minute will be counted.
![Timeline 2](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed2.png)
The measurement interval is like a **moving window**, that is being moved every second.
The process continues this way, while the moving window is discarding old messages and taking into account new messages:
![Timeline 3](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed3.png)
## Output message
+ First output: The message speed information will be send to the first output port as `msg.payload`. This payload could be visualised e.g. in a dashboard graph:
![Speed chart](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed_chart.png)
An extra `msg.frequency` field is also available (containing 'sec', 'min', 'hour').
+ Second output (since version 0.0.5): The original input message will be forwarded to this output port, which allows the speed node to be ***chained*** for better performance:
![Node chain](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed_chain.png)
In this example we have created a single *chain of nodes*: the decoder gets images from a camera, calculates the speed and detects number plates in the images. The original input message is passed through all the nodes, which improves performance since the large image doesn't need to be copied to new messages.
The same result could be achieved (in versions < 0.0.5) by using a second wire after the decoder node:
![Parallel chaisn](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed_parallel.png)
In the latter flow, Node-Red will copy the original input message to send a *cloned message* to the speed node. This means that the original image also will be cloned, which has a negative impact on performance...
## Node status
The message speed will be displayed as node status, in the flow editor:
![Node status](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/speed4.png)
```
[{"id":"a50d24c0.afaf38","type":"function","z":"47b91ceb.38a754","name":"Msg factory","func":"// Repeat the msg every 50 milliseconds\nvar repeatInterval = 50;\n\nvar interval = setInterval(function() {\n var counter = context.get('counter') || 0;\n counter = counter + 1;\n \n node.send({topic: 'mytopic_' + counter});\n \n if(counter >= 3000) {\n clearInterval(interval);\n counter = 0;\n }\n \n context.set('counter', counter);\n \n}, repeatInterval); \n\nreturn null;","outputs":1,"noerr":0,"x":453.76568603515625,"y":435.00000762939453,"wires":[["6e086760.71f778"]]},{"id":"da8aea7d.805558","type":"inject","z":"47b91ceb.38a754","name":"","topic":"","payload":"Start","payloadType":"str","repeat":"","crontab":"","once":false,"x":277.7657165527344,"y":435.00000762939453,"wires":[["a50d24c0.afaf38"]]},{"id":"6e086760.71f778","type":"msg-speed","z":"47b91ceb.38a754","name":"","frequency":"min","estimation":false,"ignore":false,"x":650.765625,"y":434.75,"wires":[["a5677c9a.dd884"]]},{"id":"a5677c9a.dd884","type":"ui_chart","z":"47b91ceb.38a754","name":"Messages per minute","group":"1a7f6b0.0560695","order":7,"width":0,"height":0,"label":"Messages per minute","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"Messages per minute","ymin":"0","ymax":"80","removeOlder":"5","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"x":868.5312423706055,"y":434.5429382324219,"wires":[[],[]]},{"id":"1a7f6b0.0560695","type":"ui_group","z":"","name":"Performance","tab":"18b10517.00400b","disp":true,"width":"6"},{"id":"18b10517.00400b","type":"ui_tab","z":"","name":"Performance","icon":"show_chart"}]
```
During the startup period the message count will be displayed orange:
![Startup status](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/startup_status.png)
And when 'ignore speed during startup' is active, the node status will indicate this during the startup period:
![Ignore startup](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/startup_ignored.png)
## Startup period
The speed is being calculated every second. As a result there will be a startup period, when the frequency is minute or hour (respectively a startup period of 60 seconds or 3600 seconds).
For example when the speed is 1 message per second, this corresponds to a speed of 60 messages per minute. However during the first minute the speed will be incomplete:
+ After the first second, the speed is 1 message per minute
+ After the second, the speed is 2 messages per minute
+ ...
+ After one minute, the speed is 60 messages msg per minute
This means the speed will increase during the startup period, to reach the final value:
![Startup](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/Startup.png)
## Node configuration
### Frequency
The frequency ('second', 'minute', 'hour') defines the interval length of the moving window.
Caution: long intervals (like 'hour' since version **0.0.4**) will take more memory to store all the intermediate speed calculations (i.e. one calculation per second).
### Estimate speed (during startup period) - Since version 0.0.3
During the startup period, the calculated speed will be incorrect. When estimation is activated, the final speed will be estimated during the startup period (using linear interpolation). The graph will start from zero immediately to an estimation of the final value:
![Estimation](https://raw.githubusercontent.com/bartbutenaers/node-red-contrib-msg-speed/master/images/estimation.png)
Caution: estimation is very useful if the message rate is stable. However when the message rate is very unpredictable, the estimation will result in incorrect values. In the latter case it might be advised to enable 'ignore speed during startup'.
### Ignore speed (during startup period) - Since version 0.0.3
During the startup period, the calculated speed will be incorrect. When ignoring speed is activated, no messages will be send on the output port during the startup period. This way it can be avoided that faulty speed values are generated.
Moreover during the startup period no node status would be displayed.
## Use cases
* Trigger an alarm e.g. when the message rate drops to 0 messages per minute.
* Performance measurement, e.g. track the number of images per second (received from a camera).

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<!--
Copyright 2017, Bart Butenaers
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.
-->
<script type="text/x-red" data-template-name="msg-speed">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-row">
<label for="node-input-frequency"><i class="fa fa-random"></i> Frequency</label>
<select id="node-input-frequency">
<option value="sec">Second</option>
<option value="min">Minute</option>
<option value="hour">Hour</option>
</select>
</div>
<div class="form-row">
<input type="checkbox" id="node-input-estimation" style="display: inline-block; width: auto; vertical-align: top;">
<label for="node-input-estimation" style="width: auto">Estimate speed during startup period</label>
</div>
<div class="form-row">
<input type="checkbox" id="node-input-ignore" style="display: inline-block; width: auto; vertical-align: top;">
<label for="node-input-ignore" style="width: auto">Ignore speed during startup period</label>
</div>
</script>
<script type="text/x-red" data-help-name="msg-speed">
<p>A node to measure the flow message speed.</p>
<p><strong>Frequency</strong></p>
<p>The speed will be measured at the specified frequency.
E.g. frequency 'hour' means that (every second) the average speed of the previous hour will be calculated.</p>
<p><strong>Estimate speed</strong></p>
<p>In case estimation is disabled, the speed will be incorrect during the startup period.
E.g. when every second 1 message arrives, the calculated speed will only be correct after the first minute has passed.
When estimation is enabled, the final speed will be estimated during the startup interval (in this example during the first minute).
This setting is useless when frequency is 'second' (which has no startup period) or when the 'ignore speed' checkbox is selected.</p>
<p><strong>Ignore speed</strong></p>
<p>When speed is ignored during the startup period, no messages will be send to the output port during the startup period.
Moreover, the node status (in the flow editor) will not display the calculated speed.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType("msg-speed", {
category: "performance",
defaults: {
name: {value:""},
frequency: {value:"sec"},
estimation: {value:false},
ignore: {value:false},
},
color:"#e2d96e",
inputs: 1,
outputs: 2,
outputLabels: ["speed","input msg"],
icon: "speed.png",
label: function() {
return this.name || "msg-speed";
},
labelStyle: function() {
return this.name ? "node_label_italic" : "";
},
});
</script>

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/**
* Copyright 2017 Bart Butenaers
*
* 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 CircularBuffer = require("circular-buffer");
var Math = require("mathjs");
function speed(config) {
RED.nodes.createNode(this, config);
this.estimationStartup = config.estimation || false;
this.ignoreStartup = config.ignore || false;
// The buffer size depends on the frequency
switch(config.frequency) {
case 'sec':
this.bufferSize = 1;
break;
case 'min':
this.bufferSize = 60;
break;
case 'hour':
this.bufferSize = 60 * 60;
break;
default:
this.bufferSize = 1; // Default 'sec'
}
this.circularBuffer = new CircularBuffer(this.bufferSize);
this.frequency = config.frequency || 'sec';
this.msgCount = 0;
this.prevStartup = false;
this.prevTotalMsgCount = 0;
this.totalMsgCount = 0;
this.startTime = null; // When the first (unprocessed) message has arrived
this.endTime = null; // When the last (unprocessed) message has arrived
this.timer = null;
var analyse = function() {
if (node.startTime == null) {
node.startTime = new Date().getTime();
}
// Register the time when the last message has arrived (or when the last timer was called, when no message has arrived)
node.endTime = new Date().getTime();
// Calculate the time interval (in seconds) since the first (unprocessed) message has arrived
var seconds = (node.endTime - node.startTime) / 1000;
var remainder = (seconds - Math.floor(seconds)) * 1000;
seconds = Math.floor(seconds);
// Correct the end time with the remainder, since the time interval since the last message (until now) is skipped in the current calculation.
// Otherwise timeslices will get behind, and the curve would have some overshoot (at startup) period before reaching the final speed.
node.endTime -= remainder;
//console.log(seconds + " seconds between " + new Date(node.startTime).toISOString().slice(11, 23) + " and " + new Date(node.endTime).toISOString().slice(11, 23));
// Store the message count (of the previous second) in the circular buffer. However the timer can be
// delayed, so make sure this is done for EVERY second since the last time we got here ...
// 10 images/2,5 seconds = 240 images/second
for(var i = 0; i < seconds; i++) {
var original = node.totalMsgCount;
// In the first second we store (the count of) all received messages, except the last one (that has been received in the next second).
// In the next second we store that remaining (single) last message. In all later seconds (of this loop) we will store 0.
var added = (i == 0) ? Math.max(0, node.msgCount - 1) : Math.max(0, node.msgCount);
// Check the content of the tail buffer cell (before it is being removed by inserting a new cell at the head), if available already
var removed = (node.circularBuffer.size() >= node.bufferSize) ? node.circularBuffer.get(node.bufferSize-1) : 0;
// The total msg count is the sum of all message counts in the circular buffer. Instead of summing all those
// buffer cells continiously (over and over again), we will update the sum together with the buffer content.
// Sum = previous sum + message count of last second (which is going to be added to the buffer)
// - message count of the first second (which is going to be removed from the buffer).
node.totalMsgCount = original + added - removed;
//console.log(node.totalMsgCount + " = " + original + " + " + added + " - " + removed);
// Store the new count in the circular buffer (which will also trigger deletion of the oldest cell at the buffer trail)
node.circularBuffer.enq(added);
var totalMsgCount = node.totalMsgCount;
var startup = false;
// Do a linear interpolation if required (only relevant in the startup period)
if (node.circularBuffer.size() < node.circularBuffer.capacity()) {
startup = true;
if (node.estimationStartup == true && node.circularBuffer.size() > 0) {
totalMsgCount = Math.floor(totalMsgCount * node.circularBuffer.capacity() / node.circularBuffer.size());
}
}
// Update the status in the editor with the last message count (only if it has changed), or when switching between startup and real
if (node.prevTotalMsgCount != node.totalMsgCount || node.prevStartup != startup) {
// Show startup speed values in orange, and real values in green
if (startup == true) {
if (node.ignoreStartup == true) {
node.status({fill:"yellow",shape:"ring",text:" start ignored" });
}
else {
node.status({fill:"yellow",shape:"ring",text:" " + totalMsgCount + "/" + node.frequency });
}
}
else {
node.status({fill:"green",shape:"dot",text:" " + totalMsgCount + "/" + node.frequency });
}
node.prevTotalMsgCount = totalMsgCount;
}
// Send a message on the first output port, when not ignored during the startup period
if (node.ignoreStartup == false || startup == false) {
node.send([{ payload: totalMsgCount, frequency: node.frequency }, null]);
}
node.prevStartup = startup;
// The message count that has already been added, shouldn't be added again the next second
node.msgCount = Math.max(0, node.msgCount - added);
}
if (seconds > 0) {
// Our new second starts at the end of the previous second
node.startTime = node.endTime;
}
}
var node = this;
this.on("input", function(msg) {
if (node.timer) {
// An msg has arrived during the specified (timeout) interval, so remove the (timeout) timer.
clearInterval(node.timer);
}
node.msgCount += 1;
//console.log("New msg arrived resulting in a message count of " + node.msgCount );
analyse();
// Register a new timer (with a timeout interval of 1 second), in case no msg should arrive during the next second.
node.timer = setInterval(function() {
//console.log("Timer called. node.msgCount = " + node.msgCount );
// Seems no msg has arrived during the last second, so register a zero count
analyse();
}, 1000);
// Send the original message on the second output port
node.send([null, msg]);
});
this.on("close",function() {
if (node.timer) {
// Stop the previous timer, to avoid having multiple timers running in parallel after a redeploy.
clearInterval(node.timer);
}
node.status({});
});
}
RED.nodes.registerType("msg-speed", speed);
};

58
nodered/rootfs/data/node_modules/node-red-contrib-msg-speed/package.json generated vendored Normal file
View File

@@ -0,0 +1,58 @@
{
"_from": "node-red-contrib-msg-speed@0.0.5",
"_id": "node-red-contrib-msg-speed@0.0.5",
"_inBundle": false,
"_integrity": "sha1-0rvNnZ49VZBbp6pcbfrKrvhJku8=",
"_location": "/node-red-contrib-msg-speed",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "node-red-contrib-msg-speed@0.0.5",
"name": "node-red-contrib-msg-speed",
"escapedName": "node-red-contrib-msg-speed",
"rawSpec": "0.0.5",
"saveSpec": null,
"fetchSpec": "0.0.5"
},
"_requiredBy": [
"#USER",
"/"
],
"_resolved": "https://registry.npmjs.org/node-red-contrib-msg-speed/-/node-red-contrib-msg-speed-0.0.5.tgz",
"_shasum": "d2bbcd9d9e3d55905ba7aa5c6dfacaaef84992ef",
"_spec": "node-red-contrib-msg-speed@0.0.5",
"_where": "/data",
"author": {
"name": "Bart Butenaers"
},
"bugs": {
"url": "https://github.com/bartbutenaers/node-red-contrib-msg-speed/issues"
},
"bundleDependencies": false,
"dependencies": {
"circular-buffer": "1.0.2",
"mathjs": "3.9.3"
},
"deprecated": false,
"description": "A Node Red node to measure the flow message speed",
"homepage": "https://github.com/bartbutenaers/node-red-contrib-msg-speed",
"keywords": [
"node-red",
"speed",
"rate",
"count"
],
"license": "Apache-2.0",
"name": "node-red-contrib-msg-speed",
"node-red": {
"nodes": {
"msg-speed": "msg_speed.js"
}
},
"repository": {
"type": "git",
"url": "git+https://github.com/bartbutenaers/node-red-contrib-msg-speed.git"
},
"version": "0.0.5"
}