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Merge pull request #29329 from backstage/gateway-plugin

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Gateway plugin
This commit is contained in:
Vincenzo Scamporlino
2025-04-15 10:06:07 +02:00
committed by GitHub
parent 5e89ce52f1 e6947e1790
commit 40126ffcd4
13 changed files with 558 additions and 20 deletions
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.changeset/quick-walls-play.md
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---
'@backstage/plugin-gateway-backend': major
---
Initial release of `@backstage/plugin-gateway-backend`
.github/vale/config/vocabularies/Backstage/accept.txt
+1
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@@ -173,6 +173,7 @@ graphviz
Hackathons
haproxy
hardcoded
hardcoding
Harness
harness
Helidon
plugins/gateway-backend/.eslintrc.js
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module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);
plugins/gateway-backend/README.md
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# Gateway Backend Plugin
A plugin for managing request routing in distributed Backstage deployments.
## Overview
This plugin is designed for organizations that have [split their backend plugins across multiple Backstage deployments](https://backstage.io/docs/backend-system/building-backends/index#split-into-multiple-backends) and implemented a custom Discovery service to resolve backend plugin URLs.
While a custom discovery service handles routing between backend plugins, it doesn't address frontend-to-backend routing without either:
- Hardcoding URLs in the frontend
- Implementing a custom reverse proxy
The Gateway Backend Plugin solves this by providing a centralized routing solution in a dedicated "gateway" Backstage deployment. It routes frontend requests to the appropriate backend plugins using the Discovery service, while prioritizing local plugins when available.
## Installation
1. Install the plugin package:
```bash
# From your root directory
yarn --cwd packages/backend add @backstage/plugin-gateway-backend
```
2. Add the plugin to your backend in `packages/backend/src/index.ts`:
```diff
const backend = createBackend();
// ...
+ backend.add(import('@backstage/plugin-gateway-backend'));
```
3. Configure the `baseUrl` in your `app-config.yaml` to point to your gateway deployment:
```yaml
backend:
# The baseUrl of your gateway Backstage deployment
baseUrl: http://gateway-backstage-backend.example.com
```
plugins/gateway-backend/catalog-info.yaml
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apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
name: backstage-plugin-gateway-backend
title: '@backstage/plugin-gateway-backend'
spec:
lifecycle: experimental
type: backstage-backend-plugin
owner: maintainers
plugins/gateway-backend/package.json
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{
"name": "@backstage/plugin-gateway-backend",
"version": "0.0.0",
"backstage": {
"role": "backend-plugin",
"pluginId": "gateway",
"pluginPackages": [
"@backstage/plugin-gateway-backend"
]
},
"publishConfig": {
"access": "public",
"main": "dist/index.cjs.js",
"types": "dist/index.d.ts"
},
"repository": {
"type": "git",
"url": "https://github.com/backstage/backstage",
"directory": "plugins/gateway-backend"
},
"license": "Apache-2.0",
"main": "src/index.ts",
"types": "src/index.ts",
"files": [
"dist"
],
"scripts": {
"build": "backstage-cli package build",
"clean": "backstage-cli package clean",
"lint": "backstage-cli package lint",
"prepack": "backstage-cli package prepack",
"postpack": "backstage-cli package postpack",
"start": "backstage-cli package start",
"test": "backstage-cli package test"
},
"dependencies": {
"@backstage/backend-plugin-api": "workspace:^",
"@opentelemetry/api": "^1.9.0",
"@opentelemetry/core": "^1.29.0",
"express": "^4.17.1",
"http-proxy-middleware": "^3.0.3"
},
"devDependencies": {
"@backstage/backend-app-api": "workspace:^",
"@backstage/backend-defaults": "workspace:^",
"@backstage/backend-test-utils": "workspace:^",
"@backstage/cli": "workspace:^",
"@types/express": "^4.17.6",
"eventsource": "^3.0.6",
"wait-for-expect": "^3.0.2"
}
}
plugins/gateway-backend/report.api.md
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## API Report File for "@backstage/plugin-gateway-backend"
> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
```ts
import { BackendFeature } from '@backstage/backend-plugin-api';
// @public
const gatewayPlugin: BackendFeature;
export default gatewayPlugin;
```
plugins/gateway-backend/src/index.ts
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/*
* Copyright 2025 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* A plugin for managing request routing in distributed Backstage deployments.
*
* @packageDocumentation
*/
export { gatewayPlugin as default } from './plugin';
plugins/gateway-backend/src/plugin.test.ts
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/*
* Copyright 2025 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { createBackend } from '@backstage/backend-defaults';
import { Backend } from '@backstage/backend-app-api';
import { mockServices } from '@backstage/backend-test-utils';
import {
coreServices,
createBackendPlugin,
createServiceFactory,
} from '@backstage/backend-plugin-api';
import { Router } from 'express';
import { EventSource } from 'eventsource';
import waitForExpect from 'wait-for-expect';
describe('gateway', () => {
let backend: Backend;
let anotherBackend: Backend;
const dummyPlugin = createBackendPlugin({
pluginId: 'dummy',
register(env) {
env.registerInit({
deps: {
httpRouter: coreServices.httpRouter,
},
async init({ httpRouter }) {
const router = Router();
router.get('/foo', (_req, res) => {
res.json({ foo: true });
});
httpRouter.use(router);
},
});
},
});
const discovery = mockServices.discovery.mock();
discovery.getBaseUrl.mockImplementation(async (pluginId: string) => {
if (pluginId === 'external-plugin') {
return 'http://localhost:7778/api/external-plugin';
}
return `http://localhost:7777/api/${pluginId}`;
});
beforeAll(async () => {
backend = createBackend();
backend.add(mockServices.rootHttpRouter.factory());
backend.add(
mockServices.rootConfig.factory({
data: {
backend: { baseUrl: 'http://localhost:7777', listen: { port: 7777 } },
},
}),
);
backend.add(mockServices.auth.factory());
backend.add(mockServices.httpAuth.factory());
backend.add(
createServiceFactory({
service: coreServices.discovery,
deps: {},
factory: () => discovery,
}),
);
backend.add(dummyPlugin);
backend.add(import('./'));
anotherBackend = createBackend();
anotherBackend.add(mockServices.rootHttpRouter.factory());
anotherBackend.add(
mockServices.rootConfig.factory({
data: {
backend: { baseUrl: 'http://localhost:7778', listen: { port: 7778 } },
},
}),
);
anotherBackend.add(mockServices.auth.factory());
anotherBackend.add(mockServices.httpAuth.factory());
anotherBackend.add(mockServices.discovery.factory());
anotherBackend.add(
createBackendPlugin({
pluginId: 'external-plugin',
register(env) {
env.registerInit({
deps: {
rootHttpRouter: coreServices.rootHttpRouter,
httpRouter: coreServices.httpRouter,
},
async init({ httpRouter }) {
const router = Router();
router.get('/foo', (_req, res) => {
res.json({ bar: true });
});
router.get('/endpoint-sse', async (_req, res) => {
res.setHeader('Content-Type', 'text/event-stream');
res.setHeader('Cache-Control', 'no-cache');
res.setHeader('Connection', 'keep-alive');
// Send periodic updates
let data = { timestamp: new Date().toISOString() };
res.write(`data: ${JSON.stringify(data)}\n\n`);
res.flush();
await pause(50);
data = { timestamp: new Date().toISOString() };
res.write(`data: ${JSON.stringify(data)}\n\n`);
res.flush();
await pause(50);
data = { timestamp: new Date().toISOString() };
res.write(`data: ${JSON.stringify(data)}\n\n`);
res.flush();
await pause(50);
res.destroy();
});
httpRouter.use(router);
},
});
},
}),
);
await Promise.all([backend.start(), anotherBackend.start()]);
}, 15_000);
afterAll(async () => {
await backend.stop();
await anotherBackend.stop();
});
it('should invoke the endpoint of an installed plugin', async () => {
const response = await fetch('http://localhost:7777/api/dummy/foo');
expect(response.status).toBe(200);
const data = await response.json();
expect(data).toEqual({ foo: true });
});
it('should proxy requests for unknown plugins', async () => {
const response = await fetch(
'http://localhost:7777/api/external-plugin/foo',
);
expect(response.status).toBe(200);
const data = await response.json();
expect(data).toEqual({ bar: true });
});
it('should close the response for sse connections', async () => {
const eventSource = new EventSource(
'http://localhost:7777/api/external-plugin/endpoint-sse',
);
const mockOnMessage = jest.fn();
const mockOnError = jest.fn();
eventSource.addEventListener('message', mockOnMessage);
eventSource.addEventListener('error', mockOnError);
await waitForExpect(() => {
expect(mockOnMessage).toHaveBeenCalledTimes(3);
expect(mockOnError).toHaveBeenCalled();
});
});
});
function pause(ms: number) {
return new Promise(resolve => setTimeout(resolve, ms));
}
plugins/gateway-backend/src/plugin.ts
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/*
* Copyright 2025 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {
coreServices,
createBackendPlugin,
} from '@backstage/backend-plugin-api';
import { createRouter } from './router';
import { instanceMetadataServiceRef } from '@backstage/backend-plugin-api/alpha';
import { Handler } from 'express';
/**
* gateway backend plugin
*
* @public
*/
export const gatewayPlugin = createBackendPlugin({
pluginId: 'gateway',
register(env) {
env.registerInit({
deps: {
logger: coreServices.logger,
rootHttpRouter: coreServices.rootHttpRouter,
instanceMeta: instanceMetadataServiceRef,
discovery: coreServices.discovery,
},
async init({ logger, discovery, instanceMeta, rootHttpRouter }) {
rootHttpRouter.use(
'/api/:pluginId',
createRouter({
discovery,
instanceMeta,
logger,
}) as Handler,
);
},
});
},
});
plugins/gateway-backend/src/router.ts
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/*
* Copyright 2025 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { DiscoveryService, LoggerService } from '@backstage/backend-plugin-api';
import { InstanceMetadataService } from '@backstage/backend-plugin-api/alpha';
import { Request, Response, NextFunction } from 'express';
import { createProxyMiddleware } from 'http-proxy-middleware';
import { context } from '@opentelemetry/api';
import { getRPCMetadata } from '@opentelemetry/core';
export function createRouter({
discovery,
instanceMeta,
}: {
discovery: DiscoveryService;
instanceMeta: InstanceMetadataService;
logger: LoggerService;
}) {
const localPluginIds = new Set(
instanceMeta
.getInstalledFeatures()
.filter(f => f.type === 'plugin')
.map(f => f.pluginId),
);
const proxy = createProxyMiddleware({
changeOrigin: true,
router: async (req: Request<{ pluginId: string }>) => {
const pluginId = req.params.pluginId;
return discovery.getBaseUrl(pluginId);
},
on: {
proxyRes(proxyRes, _req, res) {
// https://github.com/chimurai/http-proxy-middleware/discussions/765
proxyRes.on('close', () => {
if (!res.writableEnded) {
res.end();
}
});
},
},
});
return function proxyMiddleware(
req: Request<{ pluginId: string }>,
res: Response,
next: NextFunction,
) {
if (localPluginIds.has(req.params.pluginId)) {
next();
return;
}
const rpcMetadata = getRPCMetadata(context.active());
if (rpcMetadata) {
rpcMetadata.route = req.baseUrl;
}
proxy(req, res, next);
};
}
plugins/gateway-backend/src/setupTests.ts
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/*
* Copyright 2025 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
export {};
yarn.lock
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