feat(polling-contracts): add generic polling interface with TypeScript types and Zod schemas
- Add @timesafari/polling-contracts package with comprehensive type definitions - Implement GenericPollingRequest, PollingResult, and PollingScheduleConfig interfaces - Add Zod schemas for StarredProjectsRequest/Response and DeepLinkParams validation - Include calculateBackoffDelay utility with unified retry policy (exponential, linear, fixed) - Add OutboxPressureManager for storage pressure controls and back-pressure signals - Implement TelemetryManager with cardinality budgets and PII redaction - Add ClockSyncManager for JWT timestamp validation and skew tolerance - Include comprehensive unit tests with Jest snapshots and race condition testing - Add JWT_ID_PATTERN regex for canonical JWT ID format validation - Support idempotency with X-Idempotency-Key enforcement - Implement watermark CAS (Compare-and-Swap) for race condition prevention This establishes the foundation for the new generic polling system where host apps define request/response schemas and the plugin provides robust polling logic.
This commit is contained in:
Matthew Raymer
265
packages/polling-contracts/src/__tests__/watermark-cas.test.ts
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265
packages/polling-contracts/src/__tests__/watermark-cas.test.ts
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/**
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* Watermark CAS race condition tests
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*/
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import { compareJwtIds } from '../validation';
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describe('Watermark CAS Race Conditions', () => {
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const testJwtIds = [
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'1704067200_abc123_12345678', // 2024-01-01 00:00:00
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'1704153600_mno345_87654321', // 2024-01-02 00:00:00
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'1704240000_new123_abcdef01', // 2024-01-03 00:00:00
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'1704326400_xyz789_23456789', // 2024-01-04 00:00:00
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'1704412800_stu901_34567890' // 2024-01-05 00:00:00
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];
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describe('Concurrent Bootstrap Race', () => {
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it('should handle two clients bootstrapping concurrently', async () => {
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// Simulate two clients fetching the same data concurrently
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const client1Bootstrap = testJwtIds[2]; // 2024-01-03
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const client2Bootstrap = testJwtIds[3]; // 2024-01-04 (newer)
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// Client 1 attempts to set watermark
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const client1Result = await simulateWatermarkUpdate(null, client1Bootstrap);
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expect(client1Result.success).toBe(true);
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expect(client1Result.watermark).toBe(client1Bootstrap);
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// Client 2 attempts to set watermark (should succeed due to CAS)
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const client2Result = await simulateWatermarkUpdate(null, client2Bootstrap);
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expect(client2Result.success).toBe(true);
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expect(client2Result.watermark).toBe(client2Bootstrap);
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// Final watermark should be the maximum JWT ID
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const finalWatermark = await getCurrentWatermark();
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expect(finalWatermark).toBe(client2Bootstrap);
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if (finalWatermark && client1Bootstrap) {
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expect(compareJwtIds(finalWatermark, client1Bootstrap)).toBeGreaterThan(0);
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}
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});
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it('should reject older watermark updates', async () => {
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// Set initial watermark
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await simulateWatermarkUpdate(null, testJwtIds[3]); // 2024-01-04
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// Attempt to set older watermark (should fail)
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const result = await simulateWatermarkUpdate(testJwtIds[3], testJwtIds[1]); // 2024-01-02
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expect(result.success).toBe(false);
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expect(result.watermark).toBe(testJwtIds[3]); // Unchanged
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});
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it('should handle null watermark bootstrap', async () => {
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// First client sets watermark from null
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const result1 = await simulateWatermarkUpdate(null, testJwtIds[2]);
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expect(result1.success).toBe(true);
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// Second client attempts to set watermark from null (should fail)
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const result2 = await simulateWatermarkUpdate(null, testJwtIds[1]);
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expect(result2.success).toBe(false);
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expect(result2.watermark).toBe(testJwtIds[2]); // First client's watermark
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});
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});
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describe('Overlapping Polls Race', () => {
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it('should handle overlapping polls with different results', async () => {
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// Set initial watermark
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await simulateWatermarkUpdate(null, testJwtIds[1]); // 2024-01-02
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// Client 1 polls and finds changes up to 2024-01-03
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const client1Changes = [testJwtIds[2]]; // 2024-01-03
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const client1Result = await simulatePollAndUpdate(testJwtIds[1], client1Changes);
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expect(client1Result.success).toBe(true);
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expect(client1Result.newWatermark).toBe(testJwtIds[2]);
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// Client 2 polls concurrently and finds changes up to 2024-01-04
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const client2Changes = [testJwtIds[2], testJwtIds[3]]; // 2024-01-03, 2024-01-04
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const client2Result = await simulatePollAndUpdate(testJwtIds[1], client2Changes);
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expect(client2Result.success).toBe(true);
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expect(client2Result.newWatermark).toBe(testJwtIds[3]);
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// Final watermark should be the maximum
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const finalWatermark = await getCurrentWatermark();
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expect(finalWatermark).toBe(testJwtIds[3]);
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});
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it('should prevent duplicate notifications from overlapping polls', async () => {
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// Set initial watermark
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await simulateWatermarkUpdate(null, testJwtIds[1]);
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// Both clients find the same change
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const sharedChange = testJwtIds[2];
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// Client 1 processes change
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const client1Result = await simulatePollAndUpdate(testJwtIds[1], [sharedChange]);
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expect(client1Result.success).toBe(true);
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expect(client1Result.notificationsGenerated).toBe(1);
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// Client 2 attempts to process same change (should be no-op)
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const client2Result = await simulatePollAndUpdate(testJwtIds[1], [sharedChange]);
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expect(client2Result.success).toBe(false); // No new changes
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expect(client2Result.notificationsGenerated).toBe(0);
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});
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});
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describe('Watermark Monotonicity', () => {
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it('should maintain monotonic watermark advancement', async () => {
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let currentWatermark = null;
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// Process changes in order
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for (let i = 0; i < testJwtIds.length; i++) {
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const newWatermark = testJwtIds[i];
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const result = await simulateWatermarkUpdate(currentWatermark, newWatermark);
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expect(result.success).toBe(true);
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expect(result.watermark).toBe(newWatermark);
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// Verify monotonicity
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if (currentWatermark) {
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expect(compareJwtIds(newWatermark, currentWatermark)).toBeGreaterThan(0);
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}
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currentWatermark = newWatermark;
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}
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});
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it('should reject non-monotonic watermark updates', async () => {
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// Set watermark to middle value
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await simulateWatermarkUpdate(null, testJwtIds[2]);
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// Attempt to set older watermark
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const result = await simulateWatermarkUpdate(testJwtIds[2], testJwtIds[0]);
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expect(result.success).toBe(false);
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// Attempt to set same watermark
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const result2 = await simulateWatermarkUpdate(testJwtIds[2], testJwtIds[2]);
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expect(result2.success).toBe(false);
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});
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});
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describe('Platform-Specific CAS Implementation', () => {
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it('should verify SQL CAS returns row update count', async () => {
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// Simulate SQL UPDATE ... WHERE condition
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const sqlResult = await simulateSqlWatermarkUpdate(null, testJwtIds[0]);
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expect(sqlResult.rowsAffected).toBe(1);
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// Attempt to update with same condition (should affect 0 rows)
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const sqlResult2 = await simulateSqlWatermarkUpdate(null, testJwtIds[0]);
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expect(sqlResult2.rowsAffected).toBe(0);
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});
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it('should verify Room CAS returns update count', async () => {
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// Simulate Room @Query with return type Int
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const roomResult = await simulateRoomWatermarkUpdate(null, testJwtIds[0]);
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expect(roomResult).toBe(1);
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// Attempt to update with same condition
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const roomResult2 = await simulateRoomWatermarkUpdate(null, testJwtIds[0]);
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expect(roomResult2).toBe(0);
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});
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it('should verify Core Data CAS returns success boolean', async () => {
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// Simulate Core Data compare-and-swap
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const coreDataResult = await simulateCoreDataWatermarkUpdate(null, testJwtIds[0]);
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expect(coreDataResult).toBe(true);
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// Attempt to update with same condition
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const coreDataResult2 = await simulateCoreDataWatermarkUpdate(null, testJwtIds[0]);
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expect(coreDataResult2).toBe(false);
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});
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it('should verify IndexedDB CAS returns success boolean', async () => {
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// Simulate IndexedDB transaction
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const idbResult = await simulateIndexedDBWatermarkUpdate(null, testJwtIds[0]);
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expect(idbResult).toBe(true);
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// Attempt to update with same condition
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const idbResult2 = await simulateIndexedDBWatermarkUpdate(null, testJwtIds[0]);
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expect(idbResult2).toBe(false);
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});
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});
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});
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// Mock implementations for testing
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let mockWatermark: string | null = null;
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async function simulateWatermarkUpdate(
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expectedWatermark: string | null,
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newWatermark: string
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): Promise<{ success: boolean; watermark: string | null }> {
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// Simulate CAS logic
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if (mockWatermark === expectedWatermark) {
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mockWatermark = newWatermark;
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return { success: true, watermark: newWatermark };
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}
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return { success: false, watermark: mockWatermark };
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}
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async function simulatePollAndUpdate(
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currentWatermark: string | null,
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changes: string[]
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): Promise<{ success: boolean; newWatermark: string | null; notificationsGenerated: number }> {
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if (changes.length === 0) {
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return { success: false, newWatermark: currentWatermark, notificationsGenerated: 0 };
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}
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const latestChange = changes[changes.length - 1];
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const result = await simulateWatermarkUpdate(currentWatermark, latestChange);
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return {
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success: result.success,
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newWatermark: result.watermark,
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notificationsGenerated: result.success ? changes.length : 0
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};
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}
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async function getCurrentWatermark(): Promise<string | null> {
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return mockWatermark;
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}
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async function simulateSqlWatermarkUpdate(
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expectedWatermark: string | null,
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newWatermark: string
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): Promise<{ rowsAffected: number }> {
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if (mockWatermark === expectedWatermark) {
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mockWatermark = newWatermark;
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return { rowsAffected: 1 };
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}
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return { rowsAffected: 0 };
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}
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async function simulateRoomWatermarkUpdate(
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expectedWatermark: string | null,
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newWatermark: string
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): Promise<number> {
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if (mockWatermark === expectedWatermark) {
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mockWatermark = newWatermark;
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return 1;
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}
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return 0;
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}
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async function simulateCoreDataWatermarkUpdate(
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expectedWatermark: string | null,
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newWatermark: string
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): Promise<boolean> {
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if (mockWatermark === expectedWatermark) {
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mockWatermark = newWatermark;
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return true;
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}
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return false;
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}
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async function simulateIndexedDBWatermarkUpdate(
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expectedWatermark: string | null,
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newWatermark: string
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): Promise<boolean> {
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if (mockWatermark === expectedWatermark) {
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mockWatermark = newWatermark;
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return true;
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}
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return false;
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}
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// Reset mock state before each test
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beforeEach(() => {
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mockWatermark = null;
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});
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