@backstage-community/plugin-adr-backend

ADR Backend

This ADR backend plugin is primarily responsible for the following:

• Provides a DefaultAdrCollatorFactory, which can be used in the search backend to index ADR documents associated with entities to your Backstage Search.

• Provides endpoints that use UrlReaders for getting ADR documents (used in the ADR frontend plugin).

Install

Setup your integrations config

First off you'll need to setup your integrations config inside your app-config.yaml. You can skip this step if it's already setup previously, and if you need help configuring this you can read the integrations documentation

Up and Running

Here's how to get the backend up and running:

• First we need to add the @backstage-community/plugin-adr-backend package to your backend:

# From your Backstage root directory
yarn --cwd packages/backend add @backstage-community/plugin-adr-backend

• Then we will create a new file named packages/backend/src/plugins/adr.ts, and add the following to it:

import { createRouter } from '@backstage-community/plugin-adr-backend';
import { Router } from 'express';
import { PluginEnvironment } from '../types';

export default async function createPlugin(
  env: PluginEnvironment,
): Promise<Router> {
  return await createRouter({
    reader: env.reader,
    cacheClient: env.cache.getClient(),
    logger: env.logger,
  });
}

• Next we wire this into the overall backend router, edit packages/backend/src/index.ts:

import adr from './plugins/adr';
// ...
async function main() {
  // ...
  // Add this line under the other lines that follow the useHotMemoize pattern
  const adrEnv = useHotMemoize(module, () => createEnv('adr'));
  // ...
  // Insert this line under the other lines that add their routers to apiRouter in the same way
  apiRouter.use('/adr', await adr(adrEnv));

• Now run yarn start-backend from the repo root

New Backend System

The ADR backend plugin has support for the new backend system, here's how you can set that up:

In your packages/backend/src/index.ts make the following changes:

  const backend = createBackend();

+ backend.add(import('@backstage-community/plugin-adr-backend'));

// ... other feature additions

  backend.start();

Indexing ADR documents for search

Refer to the search-backend-module-adr documentation to integrate the search collator.

Parsing custom ADR formats

By default, the plugin parses documents that follow the MADR v3.0.0 and MADR v2.x template formats. If you use a different ADR format, consider writing a module that extends this plugin and provides a custom parser via the extension point adrExtensionPoint. For example, you can create a new module that provides a custom parser as follows:

import { createBackendModule } from '@backstage/backend-plugin-api';
import { adrExtensionPoint } from '@backstage-community/plugin-adr-backend';
import { createCustomAdrParser } from './parser';

export const adrModuleCustomAdrParser = createBackendModule({
  pluginId: 'adr',
  moduleId: 'custom-adr-parser',
  register(reg) {
    reg.registerInit({
      deps: {
        extensionPoint: adrExtensionPoint,
      },
      async init({ extensionPoint }) {
        extensionPoint.setAdrInfoParser(createCustomAdrParser());
      },
    });
  },
});

And in your parser.ts:

import { AdrInfoParser } from '@backstage-community/plugin-adr-common';

export const createCustomAdrParser = (): AdrInfoParser => {
  return (content: string, dateFormat?: string) => {
    // Your custom parsing logic here

    return {
      title: adrTitle,
      status: adrStatus,
      date: adrDate,
    };
  };
};