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An example of a heartbeat that detects if an html application stops responding, and restarts it. See this project for a full example of how to include a plugin like this in your BrightAuthor application: https://github.com/brightsign/node.js-starter-project
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| var express = require('express'); | |
| var app = express(); | |
| var bsSocketMessage = new BSDatagramSocket(); | |
| var intervl = undefined; | |
| var udpPort = 5003; | |
| var heartBeatFreqMs = 4000; | |
| function main() { | |
| // For testing: | |
| // curl http://[brightsign ip address]:9090/die | |
| app.get('/die', function (req, res) { | |
| clearInterval(intervl); | |
| res.write('dead'); | |
| res.end(); | |
| }); | |
| app.listen(9090, function() { | |
| console.log('Example app listening on port 9090!'); | |
| }); | |
| intervl = setInterval(function(){ | |
| bsSocketMessage.SendTo('127.0.0.1', udpPort, 'heartbeat'); | |
| console.log('Sending heartbeat'); | |
| }, heartBeatFreqMs); | |
| } | |
| window.main = main; |
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| Function Node_Initialize(msgPort As Object, userVariables As Object, bsp as Object) | |
| print "=== Node_Initialize - entry" | |
| h = {} | |
| h.version = "1.00.00" | |
| h.msgPort = msgPort | |
| h.userVariables = userVariables | |
| h.bsp = bsp | |
| h.ProcessEvent = Node_ProcessEvent | |
| h.CreateHtmlWidget = CreateHtmlWidget | |
| h.CreateHeartbeatTimer = CreateHeartbeatTimer | |
| h.CreateHeartbeatReceiver = CreateHeartbeatReceiver | |
| h.objectName = "Node_object" | |
| h.heartBeatUdpPort = 5003; | |
| h.heartBeatTimerDelaySec = 10; | |
| h.CreateHeartbeatTimer() | |
| h.CreateHeartbeatReceiver() | |
| h.CreateHtmlWidget() | |
| return h | |
| End Function | |
| Function Node_ProcessEvent(event As Object) as boolean | |
| if type(event) = "roTimerEvent" and event.GetUserData() <> invalid and event.GetUserData().name = "HeartbeatTimer" then | |
| ' If this timer fires, it means a heartbeat was not received in time. | |
| print "=== Heartbeat timer fired: calling CreateHtmlWidget" | |
| m.CreateHtmlWidget() | |
| return true | |
| else if type(event) = "roDatagramEvent" and event.GetUserData() <> invalid and event.GetUserData().name = "HeartbeatUdp" then | |
| print "=== Received UDP, restarting timer " | |
| m.CreateHeartbeatTimer() | |
| return true | |
| end if | |
| return false | |
| End Function | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| Sub CreateHeartbeatTimer() | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| if m.heartbeatTimer <> invalid then | |
| m.heartbeatTimer.Stop() | |
| m.heartbeatTimer = invalid | |
| end if | |
| m.heartbeatTimer = CreateObject("roTimer") | |
| m.heartbeatTimer.SetPort(m.msgPort) | |
| m.heartbeatTimer.SetElapsed(heartBeatTimerDelaySec, 0) | |
| heartbeatTimerAA = { name: "HeartbeatTimer" } | |
| m.heartbeatTimer.SetUserData(heartbeatTimerAA) | |
| m.heartbeatTimer.Start() | |
| End Sub | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| Sub CreateHeartbeatReceiver() | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| m.heartbeatUdpReceivePort = heartBeatUdpPort | |
| m.heartbeatUdpReceiver = CreateObject("roDatagramReceiver", m.heartbeatUdpReceivePort) | |
| m.heartbeatUdpReceiver.SetPort(m.msgPort) | |
| heartbeatUdpTimerAA = { name: "HeartbeatUdp" } | |
| m.heartbeatUdpReceiver.SetUserData(heartbeatUdpTimerAA) | |
| End Sub | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| Sub CreateHtmlWidget() | |
| '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' | |
| if m.htmlWidget <> invalid then | |
| m.htmlWidget = invalid | |
| end if | |
| url$ = "file:///sd:/node-server.html" | |
| htmlRect = CreateObject("roRectangle", 0, 0, 1920, 1080) | |
| is = { port: 2999 } | |
| config = { | |
| nodejs_enabled: true | |
| inspector_server: is | |
| brightsign_js_objects_enabled: true | |
| url: url$ | |
| } | |
| m.htmlWidget = CreateObject("roHtmlWidget", htmlRect, config) | |
| m.htmlWidget.Show() | |
| End Sub |
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| <html> | |
| <head> | |
| <script src='./index.js'></script> | |
| </head> | |
| <body style='background-color:red' onload='window.main()'> | |
| <h1> | |
| Welcome to BrightSign! | |
| </h1> | |
| </body> | |
| </html> |
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