feat: fallback to "raw" endpoint for manifest when rate limit is reached

README.md

@@ -242,18 +242,14 @@ documentation.
 
 ## Using `setup-go` on GHES
 
-`setup-go` comes pre-installed on the appliance with GHES if Actions is enabled. When dynamically downloading Go
-distributions, `setup-go` downloads distributions from [`actions/go-versions`](https://github.com/actions/go-versions)
-on github.com (outside of the appliance). These calls to `actions/go-versions` are made via unauthenticated requests,
-which are limited
-to [60 requests per hour per IP](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting). If
-more requests are made within the time frame, then you will start to see rate-limit errors during downloading that looks
-like: `##[error]API rate limit exceeded for...`. After that error the action will try to download versions directly
-from https://storage.googleapis.com/golang, but it also can have rate limit so it's better to put token.
-
-To get a higher rate limit, you
-can [generate a personal access token on github.com](https://github.com/settings/tokens/new) and pass it as the `token`
-input for the action:
+`setup-go` comes pre-installed on the appliance with GHES if Actions is enabled.
+When dynamically downloading Go distributions, `setup-go` downloads distributions from [`actions/go-versions`](https://github.com/actions/go-versions) on github.com (outside of the appliance).
+
+These calls to `actions/go-versions` are made via unauthenticated requests, which are limited to [60 requests per hour per IP](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting).
+If more requests are made within the time frame, then the action leverages the `raw API` to retrieve the version-manifest. This approach does not impose a rate limit and hence facilitates unrestricted consumption. This is particularly beneficial for GHES runners, which often share the same IP, to avoid the quick exhaustion of the unauthenticated rate limit.
+If that fails as well the action will try to download versions directly from https://storage.googleapis.com/golang.
+
+If that fails as well you can get a higher rate limit with [generating a personal access token on github.com](https://github.com/settings/tokens/new) and passing it as the `token` input to the action:
 
 ```yaml
 uses: actions/setup-go@v5
@@ -262,8 +258,7 @@ with:
   go-version: '1.18'
 ```
 
-If the runner is not able to access github.com, any Go versions requested during a workflow run must come from the
-runner's tool cache.
+If the runner is not able to access github.com, any Go versions requested during a workflow run must come from the runner's tool cache.
 See "[Setting up the tool cache on self-hosted runners without internet access](https://docs.github.com/en/[email protected]/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)"
 for more information.
 

__tests__/setup-go.test.ts

@@ -7,6 +7,7 @@ import osm, {type} from 'os';
 import path from 'path';
 import * as main from '../src/main';
 import * as im from '../src/installer';
+import * as httpm from '@actions/http-client';
 
 import goJsonData from './data/golang-dl.json';
 import matchers from '../matchers.json';
@@ -46,6 +47,7 @@ describe('setup-go', () => {
   let execSpy: jest.SpyInstance;
   let getManifestSpy: jest.SpyInstance;
   let getAllVersionsSpy: jest.SpyInstance;
+  let httpmGetJsonSpy: jest.SpyInstance;
 
   beforeAll(async () => {
     process.env['GITHUB_ENV'] = ''; // Stub out Environment file functionality so we can verify it writes to standard out (toolkit is backwards compatible)
@@ -90,6 +92,9 @@ describe('setup-go', () => {
     getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
     getAllVersionsSpy = jest.spyOn(im, 'getManifest');
 
+    // httm
+    httpmGetJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+
     // io
     whichSpy = jest.spyOn(io, 'which');
     existsSpy = jest.spyOn(fs, 'existsSync');
@@ -151,6 +156,21 @@ describe('setup-go', () => {
     );
   });
 
+  it('should return manifest from repo', async () => {
+    const manifest = await im.getManifest(undefined);
+    expect(manifest).toEqual(goTestManifest);
+  });
+
+  it('should return manifest from raw URL if repo fetch fails', async () => {
+    getManifestSpy.mockRejectedValue(new Error('Fetch failed'));
+    httpmGetJsonSpy.mockResolvedValue({
+      result: goTestManifest
+    });
+    const manifest = await im.getManifest(undefined);
+    expect(httpmGetJsonSpy).toHaveBeenCalled();
+    expect(manifest).toEqual(goTestManifest);
+  });
+
   it('can find 1.9 from manifest on linux', async () => {
     os.platform = 'linux';
     os.arch = 'x64';
@@ -790,6 +810,9 @@ describe('setup-go', () => {
       getManifestSpy.mockImplementation(() => {
         throw new Error('Unable to download manifest');
       });
+      httpmGetJsonSpy.mockRejectedValue(
+        new Error('Unable to download manifest from raw URL')
+      );
       getAllVersionsSpy.mockImplementationOnce(() => undefined);
 
       dlSpy.mockImplementation(async () => '/some/temp/path');

dist/setup/index.js

@@ -88259,6 +88259,10 @@ const sys = __importStar(__nccwpck_require__(5632));
 const fs_1 = __importDefault(__nccwpck_require__(7147));
 const os_1 = __importDefault(__nccwpck_require__(2037));
 const utils_1 = __nccwpck_require__(1314);
+const MANIFEST_REPO_OWNER = 'actions';
+const MANIFEST_REPO_NAME = 'go-versions';
+const MANIFEST_REPO_BRANCH = 'main';
+const MANIFEST_URL = `https://raw.githubusercontent.com/${MANIFEST_REPO_OWNER}/${MANIFEST_REPO_NAME}/${MANIFEST_REPO_BRANCH}/versions-manifest.json`;
 function getGo(versionSpec_1, checkLatest_1, auth_1) {
     return __awaiter(this, arguments, void 0, function* (versionSpec, checkLatest, auth, arch = os_1.default.arch()) {
         var _a;
@@ -88433,10 +88437,34 @@ function extractGoArchive(archivePath) {
 exports.extractGoArchive = extractGoArchive;
 function getManifest(auth) {
     return __awaiter(this, void 0, void 0, function* () {
-        return tc.getManifestFromRepo('actions', 'go-versions', auth, 'main');
+        try {
+            return yield getManifestFromRepo(auth);
+        }
+        catch (err) {
+            core.debug('Fetching the manifest via the API failed.');
+            if (err instanceof Error) {
+                core.debug(err.message);
+            }
+        }
+        return yield getManifestFromURL();
     });
 }
 exports.getManifest = getManifest;
+function getManifestFromRepo(auth) {
+    core.debug(`Getting manifest from ${MANIFEST_REPO_OWNER}/${MANIFEST_REPO_NAME}@${MANIFEST_REPO_BRANCH}`);
+    return tc.getManifestFromRepo(MANIFEST_REPO_OWNER, MANIFEST_REPO_NAME, auth, MANIFEST_REPO_BRANCH);
+}
+function getManifestFromURL() {
+    return __awaiter(this, void 0, void 0, function* () {
+        core.debug('Falling back to fetching the manifest using raw URL.');
+        const http = new httpm.HttpClient('tool-cache');
+        const response = yield http.getJson(MANIFEST_URL);
+        if (!response.result) {
+            throw new Error(`Unable to get manifest from ${MANIFEST_URL}`);
+        }
+        return response.result;
+    });
+}
 function getInfoFromManifest(versionSpec_1, stable_1, auth_1) {
     return __awaiter(this, arguments, void 0, function* (versionSpec, stable, auth, arch = os_1.default.arch(), manifest) {
         let info = null;

src/installer.ts

@@ -8,6 +8,11 @@ import fs from 'fs';
 import os from 'os';
 import {StableReleaseAlias} from './utils';
 
+const MANIFEST_REPO_OWNER = 'actions';
+const MANIFEST_REPO_NAME = 'go-versions';
+const MANIFEST_REPO_BRANCH = 'main';
+const MANIFEST_URL = `https://raw.githubusercontent.com/${MANIFEST_REPO_OWNER}/${MANIFEST_REPO_NAME}/${MANIFEST_REPO_BRANCH}/versions-manifest.json`;
+
 type InstallationType = 'dist' | 'manifest';
 
 export interface IGoVersionFile {
@@ -274,8 +279,43 @@ export async function extractGoArchive(archivePath: string): Promise<string> {
   return extPath;
 }
 
-export async function getManifest(auth: string | undefined) {
-  return tc.getManifestFromRepo('actions', 'go-versions', auth, 'main');
+export async function getManifest(
+  auth: string | undefined
+): Promise<tc.IToolRelease[]> {
+  try {
+    return await getManifestFromRepo(auth);
+  } catch (err) {
+    core.debug('Fetching the manifest via the API failed.');
+    if (err instanceof Error) {
+      core.debug(err.message);
+    }
+  }
+  return await getManifestFromURL();
+}
+
+function getManifestFromRepo(
+  auth: string | undefined
+): Promise<tc.IToolRelease[]> {
+  core.debug(
+    `Getting manifest from ${MANIFEST_REPO_OWNER}/${MANIFEST_REPO_NAME}@${MANIFEST_REPO_BRANCH}`
+  );
+  return tc.getManifestFromRepo(
+    MANIFEST_REPO_OWNER,
+    MANIFEST_REPO_NAME,
+    auth,
+    MANIFEST_REPO_BRANCH
+  );
+}
+
+async function getManifestFromURL(): Promise<tc.IToolRelease[]> {
+  core.debug('Falling back to fetching the manifest using raw URL.');
+
+  const http: httpm.HttpClient = new httpm.HttpClient('tool-cache');
+  const response = await http.getJson<tc.IToolRelease[]>(MANIFEST_URL);
+  if (!response.result) {
+    throw new Error(`Unable to get manifest from ${MANIFEST_URL}`);
+  }
+  return response.result;
 }
 
 export async function getInfoFromManifest(