@sap/cds-dk/lib/build/plugins/helm/index.js

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

const cds = require('../../../cds')
const { exists, path, readFileSync, yaml } = cds.utils
const { Plugin, BuildError } = require('../../../build')
const { join } = path
const { readProject } = require('../../../init/projectReader')

module.exports = class HelmBuildPlugin extends Plugin {
  static taskDefaults = { src: "." }

  static hasTask() {
    if (exists('chart/Chart.yaml')) {
      const chartFile = readFileSync(join(cds.root, 'chart', 'Chart.yaml'), 'utf8')
      const chartYaml = yaml.parseDocument(chartFile).toJS()
      return chartYaml.annotations?.["app.kubernetes.io/managed-by"] === 'cds-dk/helm'
    }
    return false
  }

  init() {
    if (this.task.src !== cds.root) {
      throw new BuildError("Invalid value for property 'src', it must have value '.'")
    }

    // different from the default build output structure
    this.task.dest = join(cds.root, cds.env.build.target !== '.' ? cds.env.build.target : 'gen', 'chart')
  }

  async build() {
    if(!HelmBuildPlugin.hasTask()) {
      this.pushMessage("Helm Chart not found. Execute `cds add helm` to add the helm chart.", Plugin.WARNING)
      return
    }

    const { hasApprouter, hasConnectivity, hasHtml5Repo } = readProject()

    const chartFile = readFileSync(join(cds.root, 'chart', 'Chart.yaml'), 'utf8')
    const chartYaml = yaml.parseDocument(chartFile).toJS()
    const isInternal = chartYaml.dependencies?.find(dep => dep.name === 'web-application')?.repository !== undefined

    if (!isInternal) {
      // copy web appplication helm chart
      await this.copy(join(__dirname, 'files', 'subcharts', 'web-application')).to('charts/web-application')

      // copy service instance helm chart
      if (this._hasSubchart('service-instance')) {
        await this.copy(join(__dirname, 'files', 'subcharts', 'service-instance')).to('charts/service-instance')
      }

      // copy content deployment helm chart
      if (this._hasSubchart('content-deployment')) {
        await this.copy(join(__dirname, 'files', 'subcharts', 'content-deployment')).to('charts/content-deployment')
      }
    }

    // copy templates
    await this.copy(join(__dirname, 'files', 'templates')).to('templates')

    const pluginResourcePath = join(__dirname, 'files', 'plugins')

    if (hasApprouter) {
      await this.copy(join(pluginResourcePath, 'approuter/approuter-configmap.yaml')).to('templates/approuter-configmap.yaml')
    }

    if (hasConnectivity) {
      await this.copy(join(pluginResourcePath, 'connectivity/connectivity-proxy-info.yaml')).to('templates/connectivity-proxy-info.yaml')
    }


    if (hasHtml5Repo) {
      await this.copy(join(pluginResourcePath, 'html5-repo/html5-apps-deployer-configmap.yaml')).to('templates/html5-apps-deployer-configmap.yaml')
    }

    // copy chart folder to gen/chart
    await this.copy(join(cds.root, 'chart')).to(".")
  }

  _hasSubchart(subchart) {
    const chart = exists('chart/Chart.yaml') ? readFileSync(join(cds.root, 'chart/Chart.yaml'), 'utf8') : ''
    return chart.includes(subchart)
  }
}