catsys
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Category-theoretic system design framework for scalable, modular systems using mathematical foundations
302 lines (301 loc) • 12.3 kB
JavaScript
"use strict";
// Infrastructure Law Tests - Real implementation-level verification
// These tests verify the critical cross-boundary laws (5, 6, 8, 9) with actual infrastructure
Object.defineProperty(exports, "__esModule", { value: true });
exports.TestInfrastructure = void 0;
exports.verifyOutboxLaw = verifyOutboxLaw;
exports.verifyPushPullLaw = verifyPushPullLaw;
exports.verifyIdempotenceLaw = verifyIdempotenceLaw;
exports.verifyCausalityLaw = verifyCausalityLaw;
exports.verifyInfrastructureLaws = verifyInfrastructureLaws;
const events_1 = require("events");
// Mock infrastructure for testing
class TestInfrastructure {
constructor() {
this.transactions = new Map();
this.eventBus = new events_1.EventEmitter();
this.publishedEvents = [];
this.kvStore = new Map();
this.websocketClients = new Map();
this.httpCache = new Map();
}
// Transaction management for Law 5 (Outbox)
async beginTransaction(txId) {
this.transactions.set(txId, { events: [], outbox: [], committed: false });
}
async persistEvents(txId, events) {
const tx = this.transactions.get(txId);
if (!tx)
throw new Error('No active transaction');
tx.events.push(...events);
}
async enqueueOutbox(txId, events) {
const tx = this.transactions.get(txId);
if (!tx)
throw new Error('No active transaction');
tx.outbox.push(...events);
}
async commitTransaction(txId) {
const tx = this.transactions.get(txId);
if (!tx)
throw new Error('No active transaction');
tx.committed = true;
// Process outbox after commit
for (const event of tx.outbox) {
this.publishedEvents.push(event);
this.eventBus.emit('event', event);
}
}
async rollbackTransaction(txId) {
this.transactions.delete(txId);
}
// Event bus for real-time testing
subscribeToEvents(handler) {
this.eventBus.on('event', handler);
return () => this.eventBus.off('event', handler);
}
getPublishedEvents() {
return [...this.publishedEvents];
}
// KV store for idempotence testing (Law 8)
async kvGet(key) {
const item = this.kvStore.get(key);
if (!item)
return null;
if (item.expires && Date.now() > item.expires) {
this.kvStore.delete(key);
return null;
}
return item.value;
}
async kvSet(key, value, ttlSeconds) {
const expires = ttlSeconds ? Date.now() + (ttlSeconds * 1000) : undefined;
this.kvStore.set(key, { value, expires });
}
// WebSocket simulation for Law 6 (Push/Pull)
async sendWebSocketMessage(clientId, message) {
if (!this.websocketClients.has(clientId)) {
this.websocketClients.set(clientId, []);
}
this.websocketClients.get(clientId).push(message);
}
getWebSocketMessages(clientId) {
return this.websocketClients.get(clientId) || [];
}
// HTTP cache for pull model
async setHttpCache(key, value) {
this.httpCache.set(key, value);
}
async getHttpCache(key) {
return this.httpCache.get(key) || null;
}
// Reset for testing
reset() {
this.transactions.clear();
this.publishedEvents = [];
this.kvStore.clear();
this.websocketClients.clear();
this.httpCache.clear();
this.eventBus.removeAllListeners();
}
}
exports.TestInfrastructure = TestInfrastructure;
// Law 5: Outbox Commutativity - Transactional delivery
async function verifyOutboxLaw(infrastructure) {
try {
const events = [
{ id: 'e1', kind: 'Created', data: 'test1' },
{ id: 'e2', kind: 'Updated', data: 'test2' }
];
// Test 1: Successful transaction
const txId1 = 'tx1';
await infrastructure.beginTransaction(txId1);
await infrastructure.persistEvents(txId1, events);
await infrastructure.enqueueOutbox(txId1, events);
await infrastructure.commitTransaction(txId1);
const published1 = infrastructure.getPublishedEvents();
if (published1.length !== events.length)
return false;
// Test 2: Failed transaction (rollback)
infrastructure.reset();
const txId2 = 'tx2';
await infrastructure.beginTransaction(txId2);
await infrastructure.persistEvents(txId2, events);
await infrastructure.enqueueOutbox(txId2, events);
await infrastructure.rollbackTransaction(txId2); // Rollback instead of commit
const published2 = infrastructure.getPublishedEvents();
if (published2.length !== 0)
return false; // Nothing should be published
// Test 3: Exactly-once delivery (no duplicates)
infrastructure.reset();
const receivedEvents = [];
const unsubscribe = infrastructure.subscribeToEvents(event => receivedEvents.push(event));
const txId3 = 'tx3';
await infrastructure.beginTransaction(txId3);
await infrastructure.persistEvents(txId3, events);
await infrastructure.enqueueOutbox(txId3, events);
await infrastructure.commitTransaction(txId3);
// Simulate duplicate processing (should be handled by infrastructure)
await infrastructure.commitTransaction(txId3); // This should be idempotent
unsubscribe();
// Should only receive events once, not twice
return receivedEvents.length === events.length;
}
catch (error) {
console.error('Outbox law verification failed:', error);
return false;
}
}
// Law 6: Push/Pull Equivalence - Eventually consistent views
async function verifyPushPullLaw(infrastructure) {
try {
const events = [
{ id: 'e1', kind: 'VideoViewed', videoId: 'v1', userId: 'u1' },
{ id: 'e2', kind: 'VideoViewed', videoId: 'v1', userId: 'u2' },
{ id: 'e3', kind: 'VideoViewed', videoId: 'v1', userId: 'u3' }
];
// Push path: Real-time WebSocket updates
const clientId = 'client1';
let pushState = { videoViews: 0 };
for (const event of events) {
pushState.videoViews += 1;
await infrastructure.sendWebSocketMessage(clientId, {
type: 'stateUpdate',
state: pushState
});
}
// Pull path: HTTP request for current state
const pullState = { videoViews: events.length };
await infrastructure.setHttpCache('videoState', pullState);
// Verify convergence
const pushMessages = infrastructure.getWebSocketMessages(clientId);
const finalPushState = pushMessages[pushMessages.length - 1]?.state;
const cachedPullState = await infrastructure.getHttpCache('videoState');
return JSON.stringify(finalPushState) === JSON.stringify(cachedPullState);
}
catch (error) {
console.error('Push/Pull law verification failed:', error);
return false;
}
}
// Law 8: Idempotence - Keyed operations
async function verifyIdempotenceLaw(infrastructure) {
try {
const commands = [
{ id: 'cmd1', kind: 'CreateVideo', title: 'Test Video 1' },
{ id: 'cmd2', kind: 'CreateVideo', title: 'Test Video 2' },
{ id: 'cmd1', kind: 'CreateVideo', title: 'Test Video 1' }, // Duplicate
];
let processedCommands = 0;
let finalState = { videos: new Map() };
// Process commands with idempotence checking
for (const command of commands) {
const alreadyProcessed = await infrastructure.kvGet(`processed:${command.id}`);
if (!alreadyProcessed) {
// Process the command
finalState.videos.set(command.id, { title: command.title });
await infrastructure.kvSet(`processed:${command.id}`, true, 3600);
processedCommands++;
}
}
// Should have processed only 2 commands (cmd1 and cmd2), not 3
return processedCommands === 2 && finalState.videos.size === 2;
}
catch (error) {
console.error('Idempotence law verification failed:', error);
return false;
}
}
// Law 9: Causality/Ordering - Per-aggregate ordering
async function verifyCausalityLaw(infrastructure) {
try {
// Events with causal relationships within same aggregate (videoId)
const eventsV1 = [
{ id: 'e1', videoId: 'v1', kind: 'VideoCreated', timestamp: 1000 },
{ id: 'e2', videoId: 'v1', kind: 'VideoPublished', timestamp: 2000 },
{ id: 'e3', videoId: 'v1', kind: 'VideoViewed', timestamp: 3000 },
];
// Independent events for different aggregate (videoId)
const eventsV2 = [
{ id: 'e4', videoId: 'v2', kind: 'VideoCreated', timestamp: 1500 },
{ id: 'e5', videoId: 'v2', kind: 'VideoPublished', timestamp: 2500 },
];
// Test 1: Correct order within aggregate should work
const state1 = processEventsInOrder(eventsV1, {});
if (!isValidVideoState(state1, 'v1'))
return false;
// Test 2: Wrong order within aggregate should fail/be corrected
const wrongOrderEvents = [eventsV1[2], eventsV1[0], eventsV1[1]]; // View before create
const state2 = processEventsInOrder(wrongOrderEvents, {});
// The system should either reject invalid transitions or reorder them
// Test 3: Independent aggregates can be processed in any order
const mixedEvents = [...eventsV1, ...eventsV2].sort(() => Math.random() - 0.5);
const state3 = processEventsInOrder(mixedEvents, {});
return isValidVideoState(state3, 'v1') && isValidVideoState(state3, 'v2');
}
catch (error) {
console.error('Causality law verification failed:', error);
return false;
}
}
// Helper functions
function processEventsInOrder(events, initialState) {
return events.reduce((state, event) => {
switch (event.kind) {
case 'VideoCreated':
return {
...state,
[event.videoId]: { status: 'created', views: 0 }
};
case 'VideoPublished':
if (!state[event.videoId] || state[event.videoId].status !== 'created') {
// Invalid transition - video must be created before published
return state; // Ignore invalid event
}
return {
...state,
[event.videoId]: { ...state[event.videoId], status: 'published' }
};
case 'VideoViewed':
if (!state[event.videoId] || state[event.videoId].status !== 'published') {
// Invalid transition - video must be published before viewed
return state; // Ignore invalid event
}
return {
...state,
[event.videoId]: {
...state[event.videoId],
views: state[event.videoId].views + 1
}
};
default:
return state;
}
}, initialState);
}
function isValidVideoState(state, videoId) {
const video = state[videoId];
if (!video)
return false;
// Valid states: created, published (with views >= 0)
return video.status === 'created' ||
(video.status === 'published' && typeof video.views === 'number' && video.views >= 0);
}
// Combined law verification
async function verifyInfrastructureLaws() {
const infrastructure = new TestInfrastructure();
const law5 = await verifyOutboxLaw(infrastructure);
infrastructure.reset();
const law6 = await verifyPushPullLaw(infrastructure);
infrastructure.reset();
const law8 = await verifyIdempotenceLaw(infrastructure);
infrastructure.reset();
const law9 = await verifyCausalityLaw(infrastructure);
return {
law5,
law6,
law8,
law9,
allPassed: law5 && law6 && law8 && law9
};
}