openui5-error-collector
v1.1.0
Published
UI5 library to collect all javascript errors
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openui5-error-collector
This library collects javascript errors and can send them to a backend, if errors need to be logged and saved for further analysis:
- vanilla js errors (reference, syntax, type, etc)
- Promises with unhandled rejections
- UI5 log events from sap/base/Log
- errors from Report API
Demo
You can check out a live demo here:
https://mauriciolauffer.github.io/openui5-error-collector/demo/index.html
Project Structure
- demo - Library's live demo
- dist - Distribution folder which contains the library ready to use
- src - Development folder
- test - Testing framework for the library
Getting started
Installation
Install openui5-error-collector as an npm module
$ npm install openui5-error-collector
How to use
Import openui5-error-collector to your UI5 application as a regular javascript file. You should import it before sap-ui-bootstrap
to capture UI5 bootstrap errors as well.
<script async src="dist/ui5ErrorCollector.min.js"></script>
<script async id="sap-ui-bootstrap" src="/resources/sap-ui-core.js" ... ></script>
Once imported, all errors will be automatically captured. It also exposes a global variable ui5ErrorCollector
, eg, window.ui5ErrorCollector
which can be used to get the errors and to set the details to send them to a backend server.
Sending errors to a backend
Developers can send all errors to a backend server setting serverUrl
with method ui5ErrorCollector.setConfiguration
. Once serverUrl
is set, errors'll be sent to it using navigator.sendBeacon
(this is not supported by IE11).
ui5ErrorCollector.setConfiguration({
serverUrl: 'https://my-backend-server.com'
});
To make it compatible with IE11, or to add any extra logic when synchronizing (transform the payload, send to multiple backends, etc), a callback onSyncHook
can be passed to method ui5ErrorCollector.setConfiguration
. This'll replace the default behaviour and use the provided callback onSyncHook
rather than navigator.sendBeacon
.
/**
* Callback provided to replace default sync with backend server
*
* @param {string} serverUrl - Server URL
* @param {UI5ErrorLogEvent[]} errors - List of captured errors, same as ui5ErrorCollector.getErrors() results
*/
function myCustomOnSyncHook(serverUrl, errors) {
// Go crazy, do whatever you wanna here...
const payload = JSON.stringify(errors);
fetch(serverUrl, {body: payload, method: 'POST'});
$.ajax(serverUrl, {body: payload, method: 'POST'});
}
ui5ErrorCollector.setConfiguration({
serverUrl: 'https://my-backend-server.com',
onSyncHook: myCustomOnSyncHook
});
Retrieving errors
Mehod ui5ErrorCollector.getErrors
will return all captured errors.
ui5ErrorCollector.getErrors(); // Which returns an array of the following object:
/**
* @type {object}
* @property {string} type - Log event type
* @property {string} timestamp - When event was logged
* @property {string} uri - Where event was logged
* @property {?string} stack - Error stack
* @property {string} message - Error message
* @property {?string} component - UI5 Log component
* @property {number} level - Log level
* @property {?number} elapsedTimestamp - Elapsed time since page load
* @property {?string} filename - File which triggered the error
*/
// Some data sample:
[
{
"type": "error",
"timestamp": "2022-02-14T05:59:02.987Z",
"uri": "http://localhost:3000/test/webapp/index.html",
"stack": "TypeError: Cannot read properties of undefined (reading 'substring')\n at http://localhost:3000/test/webapp/index.html:30:40",
"message": "Uncaught TypeError: Cannot read properties of undefined (reading 'substring')",
"component": null,
"level": 1,
"elapsedTimestamp": 755.1999999880791,
"filename": "http://localhost:3000/test/webapp/index.html"
},
{
"type": "deprecation",
"timestamp": "2022-02-14T05:59:03.294Z",
"uri": "http://localhost:3000/test/webapp/index.html",
"stack": null,
"message": "Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.",
"component": "XMLHttpRequestSynchronousInNonWorkerOutsideBeforeUnload",
"level": 1,
"elapsedTimestamp": null,
"filename": "https://openui5.hana.ondemand.com/resources/sap-ui-core.js"
},
{
"type": "ui5",
"timestamp": "2022-02-14T05:59:03.880Z",
"uri": "http://localhost:3000/test/webapp/index.html",
"stack": "Error: failed to load JavaScript resource: openui5/errorcollector/Component-preload.js\n at mapUi5LogEntry (http://localhost:3000/src/ui5ErrorCollector.js:39:17)\n at Object.logUi5LogEntry [as onLogEntry] (http://localhost:3000/src/ui5ErrorCollector.js:26:24)\n at Object.onLogEntry (https://openui5.hana.ondemand.com/resources/sap-ui-core.js:124:143)\n at f (https://openui5.hana.ondemand.com/resources/sap-ui-core.js:135:551)\n at Object.L.error (https://openui5.hana.ondemand.com/resources/sap-ui-core.js:126:27)\n at h.error (https://openui5.hana.ondemand.com/resources/sap-ui-core.js:141:109)\n at HTMLScriptElement.p (https://openui5.hana.ondemand.com/resources/sap-ui-core.js:60:413)",
"message": "failed to load JavaScript resource: openui5/errorcollector/Component-preload.js",
"component": "sap.ui.ModuleSystem",
"level": 1,
"elapsedTimestamp": null,
"filename": null
},
{
"type": "unhandledrejection",
"timestamp": "2022-02-14T05:59:05.316Z",
"uri": "http://localhost:3000/test/webapp/index.html",
"stack": null,
"message": 12345,
"component": null,
"level": 1,
"elapsedTimestamp": 3084.199999988079,
"filename": null
}
]
Author
Mauricio Lauffer