@backstage/plugin-tech-insights-backend-module-jsonfc v0.1.50
Tech Insights Backend JSON Rules engine fact checker module
This is an extension to module to tech-insights-backend plugin, which provides basic framework and functionality to implement tech insights within Backstage.
This module provides functionality to run checks against a json-rules-engine and provide boolean logic by simply building checks using JSON conditions.
Getting started
To add this FactChecker into your Tech Insights you need to install the module into your backend application:
# From your Backstage root directory
cd packages/backend
yarn add @backstage/plugin-tech-insights-backend-module-jsonfc
and modify the techInsights.ts
file to contain a reference to the FactCheckers implementation.
+import { JsonRulesEngineFactCheckerFactory } from '@backstage/plugin-tech-insights-backend-module-jsonfc';
+const myFactCheckerFactory = new JsonRulesEngineFactCheckerFactory({
+ checks: [],
+ logger,
+}),
const builder = new DefaultTechInsightsBuilder({
logger,
config,
database,
discovery,
factRetrievers: [myFactRetrieverRegistration],
+ factCheckerFactory: myFactCheckerFactory
});
By default this implementation comes with an in-memory storage to store checks. You can inject an additional data store by adding an implementation of TechInsightCheckRegistry
into the constructor options when creating a JsonRulesEngineFactCheckerFactory
. That can be done as follows
const myTechInsightCheckRegistry: TechInsightCheckRegistry<MyCheckType> = // snip
const myFactCheckerFactory = new JsonRulesEngineFactCheckerFactory({
checks: [],
logger,
+ checkRegistry: myTechInsightCheckRegistry
}),
Adding checks
Checks for this FactChecker are constructed as json-rules-engine
compatible JSON rules. A check could look like the following for example:
import { TechInsightJsonRuleCheck } from '../types';
import { JSON_RULE_ENGINE_CHECK_TYPE } from '../constants';
export const exampleCheck: TechInsightJsonRuleCheck = {
id: 'demodatacheck', // Unique identifier of this check
name: 'demodatacheck', // A human readable name of this check to be displayed in the UI
type: JSON_RULE_ENGINE_CHECK_TYPE, // Type identifier of the check. Used to run logic against, determine persistence option to use and render correct components on the UI
description: 'A fact check for demoing purposes', // A description to be displayed in the UI
factRefs: ['demo-poc.factretriever'], // References to fact containers that this check uses. See documentation on FactRetrievers for more information on these
rule: {
// The actual rule
conditions: {
all: [
// 2 options are available, all and any conditions.
{
fact: 'examplenumberfact', // Reference to an individual fact to check against
operator: 'greaterThanInclusive', // Operator to use. See: https://github.com/CacheControl/json-rules-engine/blob/master/docs/rules.md#operators for more
value: 2, // The threshold value that the fact must satisfy
},
],
},
},
successMetadata: {
// Additional metadata to be returned if the check has passed
link: 'https://link.to.some.information.com',
},
failureMetadata: {
// Additional metadata to be returned if the check has failed
link: 'https://sonar.mysonarqube.com/increasing-number-value',
},
};
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