@backstage/backend-defaults/dist/PackageDiscoveryService.cjs.js

Backend defaults used by Backstage backend apps

'use strict';

var fs = require('fs-extra');
var platformPath = require('path');
var errors = require('@backstage/errors');

function _interopDefaultCompat (e) { return e && typeof e === 'object' && 'default' in e ? e : { default: e }; }

var fs__default = /*#__PURE__*/_interopDefaultCompat(fs);

const DETECTED_PACKAGE_ROLES = [
  "node-library",
  "backend",
  "backend-plugin",
  "backend-plugin-module"
];
function isBackendFeature(value) {
  return !!value && ["object", "function"].includes(typeof value) && value.$$type === "@backstage/BackendFeature";
}
function isBackendFeatureFactory(value) {
  return !!value && typeof value === "function" && value.$$type === "@backstage/BackendFeatureFactory";
}
async function findClosestPackageDir(searchDir) {
  let path = searchDir;
  for (let i = 0; i < 1e3; i++) {
    const packagePath = platformPath.resolve(path, "package.json");
    const exists = await fs__default.default.pathExists(packagePath);
    if (exists) {
      return path;
    }
    const newPath = platformPath.dirname(path);
    if (newPath === path) {
      return void 0;
    }
    path = newPath;
  }
  throw new Error(
    `Iteration limit reached when searching for root package.json at ${searchDir}`
  );
}
class PackageDiscoveryService {
  constructor(config, logger) {
    this.config = config;
    this.logger = logger;
  }
  getDependencyNames(path) {
    const { dependencies } = require(path);
    const packagesConfig = this.config.getOptional("backend.packages");
    const dependencyNames = Object.keys(dependencies || {});
    if (packagesConfig === "all") {
      return dependencyNames;
    }
    const includedPackagesConfig = this.config.getOptionalStringArray(
      "backend.packages.include"
    );
    const includedPackages = includedPackagesConfig ? new Set(includedPackagesConfig) : dependencyNames;
    const excludedPackagesSet = new Set(
      this.config.getOptionalStringArray("backend.packages.exclude")
    );
    return [...includedPackages].filter((name) => !excludedPackagesSet.has(name));
  }
  async getBackendFeatures() {
    const packagesConfig = this.config.getOptional("backend.packages");
    if (!packagesConfig || Object.keys(packagesConfig).length === 0) {
      return { features: [] };
    }
    const packageDir = await findClosestPackageDir(process.argv[1]);
    if (!packageDir) {
      throw new Error("Package discovery failed to find package.json");
    }
    const dependencyNames = this.getDependencyNames(
      platformPath.resolve(packageDir, "package.json")
    );
    const features = [];
    for (const name of dependencyNames) {
      let depPkg;
      try {
        const packageJsonPath = require.resolve(`${name}/package.json`, {
          paths: [packageDir]
        });
        depPkg = require(packageJsonPath);
      } catch (error) {
        if (errors.isError(error) && error.code === "ERR_PACKAGE_PATH_NOT_EXPORTED") {
          continue;
        }
        throw error;
      }
      if (!depPkg?.backstage?.role || !DETECTED_PACKAGE_ROLES.includes(depPkg.backstage.role)) {
        continue;
      }
      const exportedModulePaths = [
        require.resolve(name, {
          paths: [packageDir]
        })
      ];
      try {
        exportedModulePaths.push(
          require.resolve(`${name}/alpha`, { paths: [packageDir] })
        );
      } catch {
      }
      for (const modulePath of exportedModulePaths) {
        const mod = require(modulePath);
        if (isBackendFeature(mod.default)) {
          this.logger.info(`Detected: ${name}`);
          features.push(mod.default);
        }
        if (isBackendFeatureFactory(mod.default)) {
          this.logger.info(`Detected: ${name}`);
          features.push(mod.default());
        }
      }
    }
    return { features };
  }
}

exports.PackageDiscoveryService = PackageDiscoveryService;
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