@eang/core/lib/src/functions.js

eang - model driven enterprise event processing

import { Cnx, EangEventType } from './entity.js';
import { createObj } from './objects.js';
export function parseMsg(msg) {
    // const headers = msg.headers
    const subject = msg.subject;
    // TODO: handle content-type... default is JSON and does not require header
    // const hdrs = headers()
    // hdrs.append('Content-Type', opts.contentType || 'application/json')
    const { obj, cnx, context } = JSON.parse(Buffer.from(msg.data).toString());
    if (!obj && !cnx) {
        throw new Error('Invalid message format: missing obj or cnx');
    }
    if (obj && cnx) {
        throw new Error('Invalid message format: both obj and cnx are present');
    }
    const subjectData = parseSubjectData(subject);
    // Validate eventType
    const validEventTypes = Object.values(EangEventType);
    if (!validEventTypes.includes(subjectData.eventType)) {
        throw new Error(`Invalid eventType: ${subjectData.eventType}`);
    }
    const entity = obj ? createObj(obj) : new Cnx(cnx);
    const eventType = subjectData.eventType;
    const { tenant, organizationalUnit, user } = subjectData;
    return {
        msg,
        subjectData,
        entity,
        eventType,
        context,
        tenant,
        organizationalUnit,
        user
    };
}
export function parseSubjectData(subject) {
    const parts = subject.split('.');
    if (parts[1] === 'obj') {
        // Validate minimum parts for obj type (need at least 9 parts: eang.obj.tenant.ou.user.type.instance.key.event)
        if (parts.length < 9) {
            throw new Error(`Invalid obj subject format: ${subject}. Expected at least 9 parts, got ${parts.length}`);
        }
        return {
            entityType: parts[1], // obj
            tenant: parts[2],
            organizationalUnit: parts[3],
            user: parts[4],
            typeOf: parts[5],
            instanceOf: parts[6],
            key: parts[7],
            eventType: parts[8]
        };
    } //if (parts[1] === 'cnx') {
    else {
        // Validate minimum parts for cnx type (need at least 15 parts)
        if (parts.length < 15) {
            throw new Error(`Invalid cnx subject format: ${subject}. Expected at least 15 parts, got ${parts.length}`);
        }
        return {
            entityType: 'cnx',
            tenant: parts[2],
            organizationalUnit: parts[3],
            user: parts[4],
            typeOf: parts[5],
            instanceOf: parts[6],
            key: parts[7],
            eventType: parts[8],
            fromObjTypeOf: parts[9],
            fromObjInstanceOf: parts[10],
            fromObjKey: parts[11],
            toObjTypeOf: parts[12],
            toObjInstanceOf: parts[13],
            toObjKey: parts[14]
        };
    }
}
// export function getEangMsgFromEvents(
//   events: EntityEvent[],
//   tenant: string,
//   organizationalUnit: string,
//   user: string,
//   options?: Partial<JetStreamPublishOptions>
// ) {
//   const messages = events.map((event) => {
//     return getEangMsgFromEvent(event, tenant, organizationalUnit, user, options)
//   })
//   return messages
// }
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