github-aws-runners · edersonbrilhante · Feb 12, 2026
@@ -3,7 +3,7 @@ import { Context, SQSEvent, SQSRecord } from 'aws-lambda';
 
 import { addMiddleware, adjustPool, scaleDownHandler, scaleUpHandler, ssmHousekeeper, jobRetryCheck } from './lambda';
 import { adjust } from './pool/pool';
-import ScaleError from './scale-runners/ScaleError';
+import ScaleError, { GHHttpError } from './scale-runners/ScaleError';
 import { scaleDown } from './scale-runners/scale-down';
 import { ActionRequestMessage, scaleUp } from './scale-runners/scale-up';
 import { cleanSSMTokens } from './scale-runners/ssm-housekeeper';
@@ -229,6 +229,43 @@ describe('Test scale up lambda wrapper.', () => {
         batchItemFailures: [{ itemIdentifier: 'message-0' }, { itemIdentifier: 'message-1' }],
       });
     });
+
+    it('Should return all messages as batch item failures when scaleUp throws GHHttpError', async () => {
+      const records = createMultipleRecords(3);
+      const multiRecordEvent: SQSEvent = { Records: records };
+
+      const error = new GHHttpError('Validation Failed', 422);
+      vi.mocked(scaleUp).mockRejectedValue(error);
+
+      const result = await scaleUpHandler(multiRecordEvent, context);
+      expect(result).toEqual({
+        batchItemFailures: [
+          { itemIdentifier: 'message-0' },
+          { itemIdentifier: 'message-1' },
+          { itemIdentifier: 'message-2' },
+        ],
+      });
+    });
+
+    it('Should return single message as batch item failure when scaleUp throws GHHttpError', async () => {
+      const error = new GHHttpError('Bad credentials', 401);
+      vi.mocked(scaleUp).mockRejectedValue(error);
+
+      const result = await scaleUpHandler(sqsEvent, context);
+      expect(result).toEqual({
+        batchItemFailures: [{ itemIdentifier: sqsRecord.messageId }],
+      });
+    });
+
+    it('Should not return batch item failures for generic errors (not ScaleError or GHHttpError)', async () => {
+      const records = createMultipleRecords(2);
+      const multiRecordEvent: SQSEvent = { Records: records };
+
+      vi.mocked(scaleUp).mockRejectedValue(new Error('Some unexpected error'));
+
+      const result = await scaleUpHandler(multiRecordEvent, context);
+      expect(result).toEqual({ batchItemFailures: [] });
+    });
   });
 });
 

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import type { ActionRequestMessageSQS } from './scale-up';
-import ScaleError from './ScaleError';
+import ScaleError, { GHHttpError } from './ScaleError';
 
 describe('ScaleError', () => {
   describe('detailedMessage', () => {
@@ -74,3 +74,87 @@ describe('ScaleError', () => {
     });
   });
 });
+
+describe('GHHttpError', () => {
+  describe('constructor', () => {
+    it('should set name, message, and status', () => {
+      const error = new GHHttpError('Validation Failed', 422);
+
+      expect(error.name).toBe('GHHttpError');
+      expect(error.message).toBe('Validation Failed');
+      expect(error.status).toBe(422);
+    });
+
+    it('should be an instance of ScaleError', () => {
+      const error = new GHHttpError('Not Found', 404);
+
+      expect(error).toBeInstanceOf(ScaleError);
+      expect(error).toBeInstanceOf(GHHttpError);
+      expect(error).toBeInstanceOf(Error);
+    });
+  });
+
+  describe('detailedMessage', () => {
+    it.each([
+      { message: 'Validation Failed', status: 422, expected: 'GitHub API HTTP error (status 422): Validation Failed' },
+      { message: 'Bad credentials', status: 401, expected: 'GitHub API HTTP error (status 401): Bad credentials' },
+      { message: 'Not Found', status: 404, expected: 'GitHub API HTTP error (status 404): Not Found' },
+      {
+        message: 'Internal Server Error',
+        status: 500,
+        expected: 'GitHub API HTTP error (status 500): Internal Server Error',
+      },
+    ])('should format message for status $status', ({ message, status, expected }) => {
+      const error = new GHHttpError(message, status);
+
+      expect(error.detailedMessage).toBe(expected);
+    });
+  });
+
+  describe('toBatchItemFailures', () => {
+    const mockMessages: ActionRequestMessageSQS[] = [
+      { messageId: 'msg-1', id: 1, eventType: 'workflow_job' },
+      { messageId: 'msg-2', id: 2, eventType: 'workflow_job' },
+      { messageId: 'msg-3', id: 3, eventType: 'workflow_job' },
+    ];
+
+    it('should retry ALL messages regardless of status', () => {
+      const error = new GHHttpError('Validation Failed', 422);
+      const failures = error.toBatchItemFailures(mockMessages);
+
+      expect(failures).toEqual([{ itemIdentifier: 'msg-1' }, { itemIdentifier: 'msg-2' }, { itemIdentifier: 'msg-3' }]);
+    });
+
+    it('should retry the single message when only one is provided', () => {
+      const error = new GHHttpError('Bad credentials', 401);
+      const failures = error.toBatchItemFailures([mockMessages[0]]);
+
+      expect(failures).toEqual([{ itemIdentifier: 'msg-1' }]);
+    });
+
+    it('should return empty array for empty messages', () => {
+      const error = new GHHttpError('Server Error', 500);
+      const failures = error.toBatchItemFailures([]);
+
+      expect(failures).toEqual([]);
+    });
+
+    it('should retry all messages unlike ScaleError which retries only failedInstanceCount', () => {
+      const messages: ActionRequestMessageSQS[] = [
+        { messageId: 'msg-1', id: 1, eventType: 'workflow_job' },
+        { messageId: 'msg-2', id: 2, eventType: 'workflow_job' },
+        { messageId: 'msg-3', id: 3, eventType: 'workflow_job' },
+        { messageId: 'msg-4', id: 4, eventType: 'workflow_job' },
+        { messageId: 'msg-5', id: 5, eventType: 'workflow_job' },
+      ];
+
+      // ScaleError with failedInstanceCount=1 retries only 1 message
+      const scaleError = new ScaleError(1);
+      expect(scaleError.toBatchItemFailures(messages)).toHaveLength(1);
+
+      // GHHttpError retries ALL messages
+      const ghError = new GHHttpError('error', 422);
+      expect(ghError.toBatchItemFailures(messages)).toHaveLength(5);
+    });
+  });
+});
@@ -26,4 +26,35 @@ class ScaleError extends Error {
   }
 }
 
+/**
+ * Custom error for GitHub HTTP API failures during runner config creation.
+ * Extends ScaleError so it is caught by the same handler in the Lambda entry point.
+ *
+ * Unlike a plain ScaleError (which retries only `failedInstanceCount` messages),
+ * a GHHttpError retries ALL messages because the GitHub API failure may affect
+ * every instance that was just launched.
+ */
+export class GHHttpError extends ScaleError {
+  public readonly status: number;
+
+  constructor(message: string, status: number) {
+    super();
+    this.message = message;
+    this.name = 'GHHttpError';
+    this.status = status;
+  }
+
+  public override get detailedMessage(): string {
+    return `GitHub API HTTP error (status ${this.status}): ${this.message}`;
+  }
+
+  /**
+   * Override: retry ALL messages because the GitHub API error affects the
+   * entire batch of instances that were already created.
+   */
+  public override toBatchItemFailures(messages: ActionRequestMessageSQS[]): SQSBatchItemFailure[] {
+    return messages.map(({ messageId }) => ({ itemIdentifier: messageId }));
+  }
+}
+
 export default ScaleError;
@@ -9,6 +9,7 @@ import * as ghAuth from '../github/auth';
 import { createRunner, listEC2Runners } from './../aws/runners';
 import { RunnerInputParameters } from './../aws/runners.d';
 import * as scaleUpModule from './scale-up';
+import { GHHttpError } from './ScaleError';
 import { getParameter } from '@aws-github-runner/aws-ssm-util';
 import { publishRetryMessage } from './job-retry';
 import { describe, it, expect, beforeEach, vi } from 'vitest';
@@ -1852,6 +1853,69 @@ describe('Retry mechanism tests', () => {
   });
 });
 
+describe('GHHttpError', () => {
+  it('should have correct name, message, and status properties', () => {
+    const error = new GHHttpError('test error', 422);
+    expect(error).toBeInstanceOf(Error);
+    expect(error).toBeInstanceOf(GHHttpError);
+    expect(error.name).toBe('GHHttpError');
+    expect(error.message).toBe('test error');
+    expect(error.status).toBe(422);
+  });
+
+  describe('createRunners throws GHHttpError on GitHub API HTTP failure', () => {
+    beforeEach(() => {
+      process.env.GHES_URL = 'https://github.enterprise.something';
+      process.env.ENABLE_ORGANIZATION_RUNNERS = 'true';
+      process.env.ENABLE_EPHEMERAL_RUNNERS = 'true';
+      process.env.ENABLE_JIT_CONFIG = 'true';
+      process.env.RUNNER_NAME_PREFIX = 'unit-test-';
+      process.env.RUNNER_GROUP_NAME = 'Default';
+      process.env.SSM_CONFIG_PATH = '/github-action-runners/default/runners/config';
+      process.env.SSM_TOKEN_PATH = '/github-action-runners/default/runners/config';
+      process.env.RUNNER_LABELS = 'label1,label2';
+      process.env.RUNNERS_MAXIMUM_COUNT = '3';
+    });
+
+    it('wraps JIT config GitHub HTTP error as GHHttpError', async () => {
+      const httpError = new Error('Validation Failed') as Error & { status: number };
+      httpError.name = 'HttpError';
+      httpError.status = 422;
+      mockOctokit.actions.generateRunnerJitconfigForOrg.mockRejectedValue(httpError);
+
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.toThrow(GHHttpError);
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.toMatchObject({
+        status: 422,
+        message: expect.stringContaining('Validation Failed'),
+      });
+    });
+
+    it('wraps registration token GitHub HTTP error as GHHttpError', async () => {
+      process.env.ENABLE_EPHEMERAL_RUNNERS = 'false';
+      process.env.ENABLE_JIT_CONFIG = 'false';
+
+      const httpError = new Error('Bad credentials') as Error & { status: number };
+      httpError.name = 'HttpError';
+      httpError.status = 401;
+      mockOctokit.actions.createRegistrationTokenForOrg.mockRejectedValue(httpError);
+
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.toThrow(GHHttpError);
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.toMatchObject({
+        status: 401,
+        message: expect.stringContaining('Bad credentials'),
+      });
+    });
+
+    it('does not wrap non-HTTP errors as GHHttpError', async () => {
+      const genericError = new Error('Some SSM error');
+      mockOctokit.actions.generateRunnerJitconfigForOrg.mockRejectedValue(genericError);
+
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.toThrow('Some SSM error');
+      await expect(scaleUpModule.scaleUp(TEST_DATA)).rejects.not.toBeInstanceOf(GHHttpError);
+    });
+  });
+});
+
 function defaultOctokitMockImpl() {
   mockOctokit.actions.getJobForWorkflowRun.mockImplementation(() => ({
     data: {

@@ -8,6 +8,7 @@ import { createRunner, listEC2Runners, tag } from './../aws/runners';
 import { RunnerInputParameters } from './../aws/runners.d';
 import { metricGitHubAppRateLimit } from '../github/rate-limit';
 import { publishRetryMessage } from './job-retry';
+import { GHHttpError } from './ScaleError';
 
 const logger = createChildLogger('scale-up');
 
@@ -538,10 +539,23 @@ async function createStartRunnerConfig(
   instances: string[],
   ghClient: Octokit,
 ) {
-  if (githubRunnerConfig.enableJitConfig && githubRunnerConfig.ephemeral) {
-    await createJitConfig(githubRunnerConfig, instances, ghClient);
-  } else {
-    await createRegistrationTokenConfig(githubRunnerConfig, instances, ghClient);
+  try {
+    if (githubRunnerConfig.enableJitConfig && githubRunnerConfig.ephemeral) {
+      await createJitConfig(githubRunnerConfig, instances, ghClient);
+    } else {
+      await createRegistrationTokenConfig(githubRunnerConfig, instances, ghClient);
+    }
+  } catch (error) {
+    if (error instanceof Error && error.name === 'HttpError') {
+      const status = (error as Error & { status: number }).status;
+      logger.error('GitHub API HTTP error during runner config creation', {
+        status,
+        message: error.message,
+        instances,
+      });
+      throw new GHHttpError(`Failed to create runner start config: ${error.message}`, status);
+    }
+    throw error;
   }
 }