@sap/cds-dk/bin/data-products/get-csn.js

Command line client and development toolkit for the SAP Cloud Application Programming Model

//
// get all CSNs related to Data Product from local repo (cloned from https://github.tools.sap/bdc-fos/dp-metadata)
// and combine them into one CSN file
//
// Note: in this repo, ...
// CSN files              are named like Customer_1.0.0.json -> 3 digit version
// Data Product ORD files are named like Customer_1.0.0.json -> 3 digit version
// Data Set files         are named like Customer_1.0.0.json -> 3 digit version

// TODO: sap.capdpprod:dataProduct:CarbonJournalEntries:v1 does not have datasets, only direct data sources?

'use strict'

const fs = require ('node:fs')
const { mergePartialCsns } = require ('./merge-csns')

/**
 *
 * @param ordId
 * @param kind
 */
function ordIdToPath(ordId, kind) {
  // sap.s4com:dataProduct:Customer:v1
  const regex = new RegExp('([^:]+):'+ kind + ':([^:]+):v([^:]+)')
  const match = ordId.match(regex)
  const namespace = match[1]  // "sap.s4com"
  const name      = match[2]  // "Customer"
  const version   = match[3]  // "1"
  return `${namespace.replace('.','/')}/${name}_${version}.json`  // TODO version handling!
}

/**
 *
 * @param pathToRepo
 * @param region
 * @param landscape
 * @param dataProduct_ordId
 */
exports.getDataProductCsnFromLocalRepo = function (pathToRepo, region, landscape, dataProduct_ordId) {
  const dataProduct_ordId_long_version = dataProduct_ordId + '.0.0'
  const path_prefix = pathToRepo + `/environments/${region}/${landscape}/defaults`


  const dataSource_ordIds = getDataSources()

  let partialCsns = []
  for (let dataSource_ordId of dataSource_ordIds) {
    // read csn file
    const csn_path = `${path_prefix}/csn_documents/`+ ordIdToPath(dataSource_ordId, 'dataSource')
    // environments/eu10/stage-canary/defaults/csn_documents/sap/s4com/Customer_1.0.0.json
    const csn = JSON.parse(fs.readFileSync(csn_path, { encoding: 'utf-8' }))
    partialCsns.push(csn)
  }

  const mergedCsn = mergePartialCsns(partialCsns)
  return mergedCsn

  /**
   *
   */
  function getDataSources() {
    const dpDefinitionFile = JSON.parse(fs.readFileSync(`${path_prefix}/dataproducts/` + ordIdToPath(dataProduct_ordId_long_version, 'dataProduct'), { encoding: 'utf-8' }))

    const dpdV2 = dpDefinitionFile?.dpdVersion === 'v2'

    if(dpdV2) {
      return dpDefinitionFile.dependsOn.filter(dep => dep.includes(':dataSource:'))
    } else {
      // read dataset file
      const dataset_path = `${path_prefix}/datasets/` + ordIdToPath(dataProduct_ordId_long_version, 'dataProduct')
      // environments/eu10/stage-canary/defaults/datasets/sap/s4com/Customer_1.0.0.json
      const dataset = JSON.parse(fs.readFileSync(dataset_path, { encoding: 'utf-8' }))
      return dataset.dataSources
    }
  }
}