sitecore-jss-rule-engine/src/ruleEngineRunner.ts

Rule engine for Sitecore JSS

import { ParsedRuleXmlData, RuleEngineContext } from "./types/ruleEngine";


export default async function (parsedRule:ParsedRuleXmlData | null, ruleEngineContext: RuleEngineContext) {
    
    var ruleResult = true;

    ruleEngineContext.ruleExecutionResult = {
        ruleResults: [],
        parsedRule: parsedRule,
    };

    if (!parsedRule || !parsedRule.rules) {
        return null;
    }

    await Promise.all(parsedRule.rules.map(async (rule) => {
        var result = true;

        if (rule.conditions && rule.conditions.length > 0) {

            await Promise.all(rule.conditions.map(async (condition) => {
                ruleEngineContext.ruleEngine?.debugMessage('Running condition:')
                ruleEngineContext.ruleEngine?.debugMessage(condition)

                var conditionId = condition.id ? condition.id : condition.className;

                var conditionFunction = ruleEngineContext.ruleEngine?.ruleDefinitions.get(conditionId);

                if (typeof (conditionFunction) === "undefined" || !condition) {
                    throw new Error('Rule definitions missing for id ' + conditionId);
                }

                var conditionResult = await conditionFunction(condition, ruleEngineContext);

                ruleEngineContext.ruleEngine?.debugMessage('Condition result:')
                ruleEngineContext.ruleEngine?.debugMessage(conditionResult)

                if (condition.except) {
                    conditionResult = !conditionResult;
                }

                if (typeof (conditionResult) !== 'undefined') {
                    result = result && conditionResult;
                }
            }))
        }

        ruleResult = ruleResult && result;

        ruleEngineContext.ruleEngine?.debugMessage('Rule result:', ruleResult);
        ruleEngineContext.ruleExecutionResult?.ruleResults?.push(result);

        if (result && !ruleEngineContext.skipActions && rule.actions && rule.actions.length > 0) {
            ruleEngineContext.ruleEngine?.debugMessage('Running actions:')
            ruleEngineContext.ruleEngine?.debugMessage(rule.actions)

            rule.actions.forEach((ruleAction) => {
                var actionFunction = ruleEngineContext.ruleEngine?.commandDefinitions.get(ruleAction.id);

                if (typeof (actionFunction) === "undefined" || !ruleAction) {
                    throw new Error('Rule definitions missing for id ' + ruleAction.id);
                }

                ruleEngineContext.ruleEngine?.debugMessage(actionFunction)

                actionFunction(ruleAction, ruleEngineContext);
            })
        }

    }))

    ruleEngineContext.ruleEngine?.debugMessage('Rule execution result: ', ruleResult)
    if(ruleEngineContext.ruleExecutionResult){
        ruleEngineContext.ruleExecutionResult.result = ruleResult;
    }

    return ruleResult;
}