Introduce backend-defaults package

Signed-off-by: Johan Haals <johan.haals@gmail.com>

packages/backend-app-api/api-report.md

@@ -5,6 +5,18 @@
 ```ts
 import { AnyServiceFactory } from '@backstage/backend-plugin-api';
 import { BackendRegistrable } from '@backstage/backend-plugin-api';
+import { Config } from '@backstage/config';
+import { HttpRouterService } from '@backstage/backend-plugin-api';
+import { Logger } from '@backstage/backend-plugin-api';
+import { PermissionAuthorizer } from '@backstage/plugin-permission-common';
+import { PermissionEvaluator } from '@backstage/plugin-permission-common';
+import { PluginCacheManager } from '@backstage/backend-common';
+import { PluginDatabaseManager } from '@backstage/backend-common';
+import { PluginEndpointDiscovery } from '@backstage/backend-common';
+import { PluginTaskScheduler } from '@backstage/backend-tasks';
+import { ServiceFactory } from '@backstage/backend-plugin-api';
+import { TokenManager } from '@backstage/backend-common';
+import { UrlReader } from '@backstage/backend-common';
 
 // @public (undocumented)
 export interface Backend {
@@ -15,11 +27,71 @@ export interface Backend {
 }
 
 // @public (undocumented)
-export function createBackend(options?: CreateBackendOptions): Backend;
+export const cacheFactory: ServiceFactory<
+  PluginCacheManager,
+  PluginCacheManager,
+  {}
+>;
 
 // @public (undocumented)
-export interface CreateBackendOptions {
+export const configFactory: ServiceFactory<Config, Config, {}>;
+
+// @public (undocumented)
+export function createSpecializedBackend(
+  options: CreateSpecializedBackendOptions,
+): Backend;
+
+// @public (undocumented)
+export interface CreateSpecializedBackendOptions {
   // (undocumented)
-  apis: AnyServiceFactory[];
+  serviceFactories: AnyServiceFactory[];
 }
+
+// @public (undocumented)
+export const databaseFactory: ServiceFactory<
+  PluginDatabaseManager,
+  PluginDatabaseManager,
+  {}
+>;
+
+// @public (undocumented)
+export const discoveryFactory: ServiceFactory<
+  PluginEndpointDiscovery,
+  PluginEndpointDiscovery,
+  {}
+>;
+
+// @public (undocumented)
+export const httpRouterFactory: ServiceFactory<
+  HttpRouterService,
+  HttpRouterService,
+  {}
+>;
+
+// @public (undocumented)
+export const loggerFactory: ServiceFactory<Logger, Logger, {}>;
+
+// @public (undocumented)
+export const permissionsFactory: ServiceFactory<
+  PermissionAuthorizer | PermissionEvaluator,
+  PermissionAuthorizer | PermissionEvaluator,
+  {}
+>;
+
+// @public (undocumented)
+export const schedulerFactory: ServiceFactory<
+  PluginTaskScheduler,
+  PluginTaskScheduler,
+  {}
+>;
+
+// @public (undocumented)
+export const tokenManagerFactory: ServiceFactory<
+  TokenManager,
+  TokenManager,
+  {}
+>;
+
+// @public (undocumented)
+export const urlReaderFactory: ServiceFactory<UrlReader, UrlReader, {}>;
 ```

packages/backend-app-api/src/index.ts

@@ -21,3 +21,4 @@
  */
 
 export * from './wiring';
+export * from './services/implementations';

packages/backend-app-api/src/services/implementations/cacheService.ts

@@ -21,7 +21,7 @@ import {
   cacheServiceRef,
 } from '@backstage/backend-plugin-api';
 
-// TODO: Work out some naming and implementation patterns for these
+/** @public */
 export const cacheFactory = createServiceFactory({
   service: cacheServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/configService.ts

@@ -22,6 +22,7 @@ import {
   loggerServiceRef,
 } from '@backstage/backend-plugin-api';
 
+/** @public */
 export const configFactory = createServiceFactory({
   service: configServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/databaseService.ts

@@ -21,6 +21,7 @@ import {
   databaseServiceRef,
 } from '@backstage/backend-plugin-api';
 
+/** @public */
 export const databaseFactory = createServiceFactory({
   service: databaseServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/discoveryService.ts

@@ -21,6 +21,7 @@ import {
   discoveryServiceRef,
 } from '@backstage/backend-plugin-api';
 
+/** @public */
 export const discoveryFactory = createServiceFactory({
   service: discoveryServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/httpRouterService.ts

@@ -23,6 +23,7 @@ import Router from 'express-promise-router';
 import { Handler } from 'express';
 import { createServiceBuilder } from '@backstage/backend-common';
 
+/** @public */
 export const httpRouterFactory = createServiceFactory({
   service: httpRouterServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/index.ts

@@ -14,26 +14,13 @@
  * limitations under the License.
  */
 
-import { cacheFactory } from './cacheService';
-import { configFactory } from './configService';
-import { databaseFactory } from './databaseService';
-import { discoveryFactory } from './discoveryService';
-import { loggerFactory } from './loggerService';
-import { permissionsFactory } from './permissionsService';
-import { schedulerFactory } from './schedulerService';
-import { tokenManagerFactory } from './tokenManagerService';
-import { urlReaderFactory } from './urlReaderService';
-import { httpRouterFactory } from './httpRouterService';
-
-export const defaultServiceFactories = [
-  cacheFactory,
-  configFactory,
-  databaseFactory,
-  discoveryFactory,
-  loggerFactory,
-  permissionsFactory,
-  schedulerFactory,
-  tokenManagerFactory,
-  urlReaderFactory,
-  httpRouterFactory,
-];
+export { cacheFactory } from './cacheService';
+export { configFactory } from './configService';
+export { databaseFactory } from './databaseService';
+export { discoveryFactory } from './discoveryService';
+export { loggerFactory } from './loggerService';
+export { permissionsFactory } from './permissionsService';
+export { schedulerFactory } from './schedulerService';
+export { tokenManagerFactory } from './tokenManagerService';
+export { urlReaderFactory } from './urlReaderService';
+export { httpRouterFactory } from './httpRouterService';

packages/backend-app-api/src/services/implementations/loggerService.ts

@@ -38,6 +38,7 @@ class BackstageLogger implements Logger {
   }
 }
 
+/** @public */
 export const loggerFactory = createServiceFactory({
   service: loggerServiceRef,
   deps: {},

packages/backend-app-api/src/services/implementations/permissionsService.ts

@@ -23,6 +23,7 @@ import {
 } from '@backstage/backend-plugin-api';
 import { ServerPermissionClient } from '@backstage/plugin-permission-node';
 
+/** @public */
 export const permissionsFactory = createServiceFactory({
   service: permissionsServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/schedulerService.ts

@@ -21,6 +21,7 @@ import {
 } from '@backstage/backend-plugin-api';
 import { TaskScheduler } from '@backstage/backend-tasks';
 
+/** @public */
 export const schedulerFactory = createServiceFactory({
   service: schedulerServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/tokenManagerService.ts

@@ -23,6 +23,7 @@ import {
 } from '@backstage/backend-plugin-api';
 import { ServerTokenManager } from '@backstage/backend-common';
 
+/** @public */
 export const tokenManagerFactory = createServiceFactory({
   service: tokenManagerServiceRef,
   deps: {

packages/backend-app-api/src/services/implementations/urlReaderService.ts

@@ -23,6 +23,7 @@ import {
   urlReaderServiceRef,
 } from '@backstage/backend-plugin-api';
 
+/** @public */
 export const urlReaderFactory = createServiceFactory({
   service: urlReaderServiceRef,
   deps: {

packages/backend-app-api/src/wiring/index.ts

@@ -14,5 +14,5 @@
  * limitations under the License.
  */
 
-export type { Backend, CreateBackendOptions } from './types';
-export { createBackend } from './types';
+export type { Backend, CreateSpecializedBackendOptions } from './types';
+export { createSpecializedBackend } from './types';

packages/backend-app-api/src/wiring/types.ts

@@ -20,7 +20,6 @@ import {
   FactoryFunc,
   ServiceRef,
 } from '@backstage/backend-plugin-api';
-import { defaultServiceFactories } from '../services/implementations';
 import { BackstageBackend } from './BackstageBackend';
 
 /**
@@ -42,8 +41,8 @@ export interface BackendRegisterInit {
 /**
  * @public
  */
-export interface CreateBackendOptions {
-  apis: AnyServiceFactory[];
+export interface CreateSpecializedBackendOptions {
+  serviceFactories: AnyServiceFactory[];
 }
 
 export type ServiceHolder = {
@@ -53,10 +52,8 @@ export type ServiceHolder = {
 /**
  * @public
  */
-export function createBackend(options?: CreateBackendOptions): Backend {
-  // TODO: merge with provided APIs
-  return new BackstageBackend([
-    ...defaultServiceFactories,
-    ...(options?.apis ?? []),
-  ]);
+export function createSpecializedBackend(
+  options: CreateSpecializedBackendOptions,
+): Backend {
+  return new BackstageBackend(options.serviceFactories);
 }