@ooples/token-optimizer-mcp
Version:
Intelligent context window optimization for Claude Code - store content externally via caching and compression, freeing up your context window for what matters
1,132 lines • 39.7 kB
JavaScript
/**
* CacheWarmup - Intelligent Cache Pre-warming Tool
*
* Token Reduction Target: 87%+
*
* Features:
* - Schedule-based warming (cron-like)
* - Pattern-based warming from historical access
* - Dependency graph resolution
* - Parallel warming with concurrency control
* - Progressive warming (hot keys first)
* - Dry-run simulation mode
* - Rollback on failures
*
* Operations:
* 1. schedule - Schedule cache warming
* 2. immediate - Warm cache immediately
* 3. pattern-based - Warm based on access patterns
* 4. dependency-based - Warm with dependency resolution
* 5. selective - Warm specific keys/categories
* 6. status - Get warming status
*/
import { EventEmitter } from 'events';
/**
* CacheWarmup - Intelligent cache pre-warming with advanced scheduling and dependency resolution
*/
export class CacheWarmupTool extends EventEmitter {
cache;
tokenCounter;
metrics;
// Configuration
config = {
maxConcurrency: 10,
batchSize: 50,
defaultTimeout: 30000,
maxRetries: 3,
enableRollback: true,
progressReporting: true,
};
// Active jobs
activeJobs = new Map();
jobCounter = 0;
// Schedules
schedules = new Map();
scheduleTimers = new Map();
// Access patterns
accessHistory = new Map();
hotKeys = new Set();
// Dependency graph
dependencyGraph = null;
resolvedOrder = [];
// Statistics
stats = {
totalWarmed: 0,
totalFailed: 0,
totalSkipped: 0,
averageWarmupTime: 0,
lastWarmupTime: 0,
};
constructor(cache, tokenCounter, metrics) {
super();
this.cache = cache;
this.tokenCounter = tokenCounter;
this.metrics = metrics;
}
/**
* Main entry point for cache warmup operations
*/
async run(options) {
const startTime = Date.now();
const { operation, useCache = true } = options;
// Generate cache key for cacheable operations
let cacheKey = null;
if (useCache && this.isCacheableOperation(operation)) {
cacheKey = `cache-warmup:${JSON.stringify({
operation,
...this.getCacheKeyParams(options),
})}`;
// Check cache
const cached = this.cache.get(cacheKey);
if (cached) {
const cachedResult = JSON.parse(cached);
const tokensSaved = this.tokenCounter.count(JSON.stringify(cachedResult)).tokens;
return {
success: true,
operation,
data: cachedResult,
metadata: {
tokensUsed: 0,
tokensSaved,
cacheHit: true,
executionTime: Date.now() - startTime,
},
};
}
}
// Execute operation
let data;
try {
switch (operation) {
case 'immediate':
data = await this.immediateWarmup(options);
break;
case 'schedule':
data = await this.scheduleWarmup(options);
break;
case 'pattern-based':
data = await this.patternBasedWarmup(options);
break;
case 'dependency-based':
data = await this.dependencyBasedWarmup(options);
break;
case 'selective':
data = await this.selectiveWarmup(options);
break;
case 'status':
data = await this.getStatus(options);
break;
case 'cancel':
data = await this.cancelWarmup(options);
break;
case 'pause':
data = await this.pauseWarmup(options);
break;
case 'resume':
data = await this.resumeWarmup(options);
break;
case 'configure':
data = await this.configure(options);
break;
default:
throw new Error(`Unknown operation: ${operation}`);
}
// Cache the result
const tokensUsedResult = this.tokenCounter.count(JSON.stringify(data));
const tokensUsed = tokensUsedResult.tokens;
if (cacheKey && useCache) {
const serialized = JSON.stringify(data);
this.cache.set(cacheKey, serialized, serialized.length, tokensUsed);
}
// Record metrics
this.metrics.record({
operation: `cache_warmup_${operation}`,
duration: Date.now() - startTime,
success: true,
cacheHit: false,
inputTokens: 0,
outputTokens: tokensUsed,
cachedTokens: 0,
savedTokens: 0,
metadata: { operation },
});
return {
success: true,
operation,
data,
metadata: {
tokensUsed,
tokensSaved: 0,
cacheHit: false,
executionTime: Date.now() - startTime,
},
};
}
catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
this.metrics.record({
operation: `cache_warmup_${operation}`,
duration: Date.now() - startTime,
success: false,
cacheHit: false,
inputTokens: 0,
outputTokens: 0,
cachedTokens: 0,
savedTokens: 0,
metadata: { operation, error: errorMessage },
});
throw error;
}
}
/**
* Immediate cache warmup
*/
async immediateWarmup(options) {
const { keys = [], strategy = 'progressive', priority = 'normal', dryRun = false, maxConcurrency = this.config.maxConcurrency, batchSize = this.config.batchSize, enableRollback = this.config.enableRollback, } = options;
if (keys.length === 0) {
throw new Error('No keys provided for immediate warmup');
}
// Create warmup job
const jobId = this.generateJobId();
const job = {
id: jobId,
keys,
priority,
strategy,
status: 'warming',
options,
progress: {
status: 'warming',
totalKeys: keys.length,
warmedKeys: 0,
failedKeys: 0,
skippedKeys: 0,
percentComplete: 0,
startTime: Date.now(),
elapsedTime: 0,
throughput: 0,
errors: [],
},
rollbackData: enableRollback ? new Map() : undefined,
abortController: new AbortController(),
};
if (dryRun) {
// Simulate warmup
const simulation = await this.simulateWarmup(keys, options);
return { simulation };
}
this.activeJobs.set(jobId, job);
this.emit('warmup-started', { jobId, keys: keys.length, strategy });
try {
// Execute warmup based on strategy
let warmedKeys;
if (strategy === 'progressive') {
warmedKeys = await this.progressiveWarmup(job, maxConcurrency, batchSize);
}
else if (strategy === 'dependency') {
warmedKeys = await this.warmupWithDependencies(job, options);
}
else if (strategy === 'pattern') {
warmedKeys = await this.warmupByPattern(job, options);
}
else {
warmedKeys = await this.parallelWarmup(job, maxConcurrency, batchSize);
}
job.progress.status = 'completed';
job.status = 'completed';
this.stats.totalWarmed += warmedKeys.length;
this.stats.totalFailed += job.progress.failedKeys;
this.stats.lastWarmupTime = Date.now();
this.emit('warmup-completed', {
jobId,
warmedKeys: warmedKeys.length,
failed: job.progress.failedKeys,
});
return {
progress: job.progress,
warmedKeys,
failedKeys: job.progress.errors.map((e) => e.key),
};
}
catch (error) {
job.progress.status = 'failed';
job.status = 'failed';
// Rollback if enabled
if (enableRollback && job.rollbackData) {
await this.rollback(job);
}
this.emit('warmup-failed', { jobId, error: String(error) });
throw error;
}
finally {
this.activeJobs.delete(jobId);
}
}
/**
* Schedule cache warmup with cron expression
*/
async scheduleWarmup(options) {
const { schedule: cronExpression, scheduleId } = options;
if (!cronExpression) {
throw new Error('Schedule expression is required');
}
const id = scheduleId || this.generateScheduleId();
const parsedCron = this.parseCronExpression(cronExpression);
const nextRun = this.calculateNextRun(parsedCron);
const schedule = {
id,
cronExpression,
options,
enabled: true,
nextRun,
status: 'active',
};
this.schedules.set(id, schedule);
this.scheduleNextRun(schedule);
this.emit('schedule-created', { id, nextRun });
return {
schedule,
schedules: Array.from(this.schedules.values()),
};
}
/**
* Pattern-based warmup from access history
*/
async patternBasedWarmup(options) {
const { accessHistory, minAccessCount = 5, timeWindow = 3600000, // 1 hour
warmupPercentage = 80, pattern, } = options;
// Update access history if provided
if (accessHistory) {
this.updateAccessHistory(accessHistory);
}
// Analyze patterns and identify hot keys
const now = Date.now();
const hotKeys = this.identifyHotKeys(now - timeWindow, minAccessCount);
// Apply pattern filter if provided
let keysToWarm = Array.from(hotKeys);
if (pattern) {
const regex = new RegExp(pattern);
keysToWarm = keysToWarm.filter((key) => regex.test(key));
}
// Limit by warmup percentage
const maxKeys = Math.ceil(keysToWarm.length * (warmupPercentage / 100));
keysToWarm = keysToWarm.slice(0, maxKeys);
// Execute warmup
return this.immediateWarmup({
...options,
operation: 'immediate',
keys: keysToWarm,
strategy: 'progressive',
});
}
/**
* Dependency-based warmup with graph resolution
*/
async dependencyBasedWarmup(options) {
const { dependencies, keys = [] } = options;
if (!dependencies) {
throw new Error('Dependency graph is required for dependency-based warmup');
}
this.dependencyGraph = dependencies;
// Resolve dependencies for requested keys
const resolvedKeys = this.resolveDependencies(keys);
this.resolvedOrder = resolvedKeys;
this.emit('dependencies-resolved', {
requestedKeys: keys.length,
resolvedKeys: resolvedKeys.length,
});
// Execute warmup in dependency order
return this.immediateWarmup({
...options,
operation: 'immediate',
keys: resolvedKeys,
strategy: 'dependency',
});
}
/**
* Selective warmup for specific keys/categories
*/
async selectiveWarmup(options) {
const { keys = [], categories = [] } = options;
let keysToWarm = [...keys];
// Add keys from categories
if (categories.length > 0) {
for (const [key, entries] of this.accessHistory.entries()) {
const hasCategory = entries.some((entry) => entry.category && categories.includes(entry.category));
if (hasCategory && !keysToWarm.includes(key)) {
keysToWarm.push(key);
}
}
}
if (keysToWarm.length === 0) {
throw new Error('No keys to warm up');
}
return this.immediateWarmup({
...options,
operation: 'immediate',
keys: keysToWarm,
});
}
/**
* Get warmup status
*/
async getStatus(_options) {
const activeJobs = Array.from(this.activeJobs.values());
const schedules = Array.from(this.schedules.values());
const progress = activeJobs.length > 0 ? activeJobs[0].progress : undefined;
return {
progress,
schedules,
};
}
/**
* Cancel warmup job
*/
async cancelWarmup(options) {
const { scheduleId } = options;
if (scheduleId) {
// Cancel scheduled warmup
const schedule = this.schedules.get(scheduleId);
if (schedule) {
this.cancelSchedule(scheduleId);
return { schedule: { ...schedule, status: 'completed' } };
}
}
// Cancel active jobs
for (const job of this.activeJobs.values()) {
job.abortController?.abort();
job.status = 'cancelled';
job.progress.status = 'cancelled';
if (job.rollbackData) {
await this.rollback(job);
}
}
this.activeJobs.clear();
return { progress: undefined };
}
/**
* Pause warmup job
*/
async pauseWarmup(_options) {
for (const job of this.activeJobs.values()) {
job.status = 'paused';
job.progress.status = 'paused';
}
this.emit('warmup-paused', { jobs: this.activeJobs.size });
return { progress: Array.from(this.activeJobs.values())[0]?.progress };
}
/**
* Resume warmup job
*/
async resumeWarmup(_options) {
for (const job of this.activeJobs.values()) {
if (job.status === 'paused') {
job.status = 'warming';
job.progress.status = 'warming';
}
}
this.emit('warmup-resumed', { jobs: this.activeJobs.size });
return { progress: Array.from(this.activeJobs.values())[0]?.progress };
}
/**
* Configure warmup settings
*/
async configure(options) {
if (options.maxConcurrency !== undefined) {
this.config.maxConcurrency = options.maxConcurrency;
}
if (options.batchSize !== undefined) {
this.config.batchSize = options.batchSize;
}
if (options.timeout !== undefined) {
this.config.defaultTimeout = options.timeout;
}
if (options.maxRetries !== undefined) {
this.config.maxRetries = options.maxRetries;
}
if (options.enableRollback !== undefined) {
this.config.enableRollback = options.enableRollback;
}
if (options.reportProgress !== undefined) {
this.config.progressReporting = options.reportProgress;
}
this.emit('configuration-updated', this.config);
return { configuration: { ...this.config } };
}
/**
* Progressive warmup - warm hot keys first
*/
async progressiveWarmup(job, maxConcurrency, batchSize) {
const { keys } = job;
// Sort keys by priority (hot keys first)
const sortedKeys = this.sortKeysByPriority(keys);
const warmedKeys = [];
// Warm in batches with concurrency control
for (let i = 0; i < sortedKeys.length; i += batchSize) {
if (job.abortController?.signal.aborted || job.status === 'paused') {
break;
}
const batch = sortedKeys.slice(i, i + batchSize);
const batchResults = await this.warmBatchParallel(batch, job, maxConcurrency);
warmedKeys.push(...batchResults.warmed);
this.updateProgress(job, batchResults.warmed.length, batchResults.failed.length);
if (job.options.delayBetweenBatches) {
await this.sleep(job.options.delayBetweenBatches);
}
this.emit('batch-completed', {
jobId: job.id,
batch: i / batchSize + 1,
warmed: batchResults.warmed.length,
failed: batchResults.failed.length,
});
}
return warmedKeys;
}
/**
* Warmup with dependency resolution
*/
async warmupWithDependencies(job, options) {
const keysToWarm = this.resolvedOrder.length > 0 ? this.resolvedOrder : job.keys;
const warmedKeys = [];
// Warm keys in dependency order
for (const key of keysToWarm) {
if (job.abortController?.signal.aborted || job.status === 'paused') {
break;
}
const result = await this.warmKey(key, job, options);
if (result.success) {
warmedKeys.push(key);
this.updateProgress(job, 1, 0);
}
else {
this.updateProgress(job, 0, 1);
}
}
return warmedKeys;
}
/**
* Warmup by pattern matching
*/
async warmupByPattern(job, options) {
const { pattern } = options;
let keysToWarm = job.keys;
if (pattern) {
const regex = new RegExp(pattern);
keysToWarm = keysToWarm.filter((key) => regex.test(key));
}
return this.parallelWarmup({ ...job, keys: keysToWarm }, this.config.maxConcurrency, this.config.batchSize);
}
/**
* Parallel warmup with concurrency control
*/
async parallelWarmup(job, maxConcurrency, batchSize) {
const warmedKeys = [];
const { keys } = job;
for (let i = 0; i < keys.length; i += batchSize) {
if (job.abortController?.signal.aborted || job.status === 'paused') {
break;
}
const batch = keys.slice(i, i + batchSize);
const batchResults = await this.warmBatchParallel(batch, job, maxConcurrency);
warmedKeys.push(...batchResults.warmed);
this.updateProgress(job, batchResults.warmed.length, batchResults.failed.length);
}
return warmedKeys;
}
/**
* Warm a batch of keys in parallel
*/
async warmBatchParallel(keys, job, maxConcurrency) {
const warmed = [];
const failed = [];
const chunks = [];
// Split into chunks for concurrency control
for (let i = 0; i < keys.length; i += maxConcurrency) {
chunks.push(keys.slice(i, i + maxConcurrency));
}
for (const chunk of chunks) {
if (job.abortController?.signal.aborted || job.status === 'paused') {
break;
}
const promises = chunk.map((key) => this.warmKey(key, job, job.options));
const results = await Promise.allSettled(promises);
results.forEach((result, index) => {
if (result.status === 'fulfilled' && result.value.success) {
warmed.push(chunk[index]);
}
else {
failed.push(chunk[index]);
}
});
}
return { warmed, failed };
}
/**
* Warm a single key
*/
async warmKey(key, job, options) {
const { dataFetcher, dataSource, timeout = this.config.defaultTimeout, } = options;
let retries = 0;
const maxRetries = options.maxRetries || this.config.maxRetries;
job.progress.currentKey = key;
while (retries <= maxRetries) {
try {
// Save current state for rollback
if (job.rollbackData) {
const existing = this.cache.get(key);
job.rollbackData.set(key, existing);
}
// Fetch data
const data = await this.fetchData(key, dataFetcher, dataSource, timeout);
// Warm cache
const originalSize = data.length;
const compressedSize = originalSize; // Assume no additional compression
this.cache.set(key, data, originalSize, compressedSize);
return { success: true, data };
}
catch (error) {
retries++;
if (retries > maxRetries) {
job.progress.errors.push({
key,
error: error instanceof Error ? error.message : String(error),
timestamp: Date.now(),
retryCount: retries - 1,
});
return { success: false };
}
// Wait before retry
if (options.retryDelay) {
await this.sleep(options.retryDelay);
}
}
}
return { success: false };
}
/**
* Fetch data for a key
*/
async fetchData(key, dataFetcher, dataSource, timeout) {
if (dataFetcher) {
return this.withTimeout(dataFetcher(key), timeout);
}
if (dataSource?.customFetcher) {
return this.withTimeout(dataSource.customFetcher(key), timeout);
}
if (dataSource?.type === 'cache') {
const existing = this.cache.get(key);
if (existing)
return existing;
}
// Default: return mock data for testing
return `mock-data-for-${key}`;
}
/**
* Simulate warmup
*/
async simulateWarmup(keys, options) {
const { batchSize = this.config.batchSize } = options;
const estimatedSize = keys.reduce((sum, key) => sum + key.length * 10, 0);
const batches = Math.ceil(keys.length / batchSize);
const estimatedTime = batches * 1000; // 1 second per batch
// Analyze priority distribution
const priorityCount = { high: 0, normal: 0, low: 0 };
for (const key of keys) {
if (this.hotKeys.has(key)) {
priorityCount.high++;
}
else {
priorityCount.normal++;
}
}
// Analyze dependency layers
let dependencyLayers = 0;
if (this.dependencyGraph) {
dependencyLayers = this.calculateDependencyDepth(keys);
}
const warnings = [];
if (keys.length > 10000) {
warnings.push('Large number of keys may cause performance issues');
}
if (estimatedSize > 100 * 1024 * 1024) {
warnings.push('Estimated cache size exceeds 100MB');
}
return {
estimatedKeys: keys.length,
estimatedSize,
estimatedTime,
estimatedCost: estimatedSize * 0.000001, // Mock cost
keysByPriority: priorityCount,
dependencyLayers,
warnings,
};
}
/**
* Rollback warmup changes
*/
async rollback(job) {
if (!job.rollbackData)
return;
this.emit('rollback-started', {
jobId: job.id,
keys: job.rollbackData.size,
});
for (const [key, originalValue] of job.rollbackData.entries()) {
if (originalValue === null) {
this.cache.delete(key);
}
else {
this.cache.set(key, originalValue, originalValue.length, originalValue.length);
}
}
this.emit('rollback-completed', { jobId: job.id });
}
/**
* Resolve dependencies in topological order
*/
resolveDependencies(keys) {
if (!this.dependencyGraph)
return keys;
const { edges } = this.dependencyGraph;
const resolved = [];
const visited = new Set();
// Build adjacency list
const adjacency = new Map();
for (const edge of edges) {
if (!adjacency.has(edge.from)) {
adjacency.set(edge.from, []);
}
adjacency.get(edge.from).push(edge.to);
}
// DFS topological sort
const visit = (key) => {
if (visited.has(key))
return;
visited.add(key);
const dependencies = adjacency.get(key) || [];
for (const dep of dependencies) {
visit(dep);
}
resolved.push(key);
};
// Visit all requested keys
for (const key of keys) {
visit(key);
}
return resolved.reverse();
}
/**
* Calculate dependency depth
*/
calculateDependencyDepth(keys) {
if (!this.dependencyGraph)
return 0;
const { edges } = this.dependencyGraph;
const adjacency = new Map();
for (const edge of edges) {
if (!adjacency.has(edge.from)) {
adjacency.set(edge.from, []);
}
adjacency.get(edge.from).push(edge.to);
}
let maxDepth = 0;
const getDepth = (key, depth, visited) => {
if (visited.has(key))
return depth;
visited.add(key);
const dependencies = adjacency.get(key) || [];
let maxChildDepth = depth;
for (const dep of dependencies) {
const childDepth = getDepth(dep, depth + 1, visited);
maxChildDepth = Math.max(maxChildDepth, childDepth);
}
return maxChildDepth;
};
for (const key of keys) {
const depth = getDepth(key, 0, new Set());
maxDepth = Math.max(maxDepth, depth);
}
return maxDepth;
}
/**
* Identify hot keys from access history
*/
identifyHotKeys(since, minAccessCount) {
const hotKeys = new Set();
for (const [key, entries] of this.accessHistory.entries()) {
const recentAccesses = entries.filter((e) => e.timestamp >= since);
const totalAccesses = recentAccesses.reduce((sum, e) => sum + e.accessCount, 0);
if (totalAccesses >= minAccessCount) {
hotKeys.add(key);
this.hotKeys.add(key);
}
}
return hotKeys;
}
/**
* Sort keys by priority (hot keys first)
*/
sortKeysByPriority(keys) {
return keys.sort((a, b) => {
const aHot = this.hotKeys.has(a);
const bHot = this.hotKeys.has(b);
if (aHot && !bHot)
return -1;
if (!aHot && bHot)
return 1;
// Sort by access count
const aHistory = this.accessHistory.get(a) || [];
const bHistory = this.accessHistory.get(b) || [];
const aCount = aHistory.reduce((sum, e) => sum + e.accessCount, 0);
const bCount = bHistory.reduce((sum, e) => sum + e.accessCount, 0);
return bCount - aCount;
});
}
/**
* Update access history
*/
updateAccessHistory(entries) {
for (const entry of entries) {
if (!this.accessHistory.has(entry.key)) {
this.accessHistory.set(entry.key, []);
}
this.accessHistory.get(entry.key).push(entry);
}
// Trim old entries
const maxEntries = 1000;
for (const [key, entries] of this.accessHistory.entries()) {
if (entries.length > maxEntries) {
this.accessHistory.set(key, entries.slice(-maxEntries));
}
}
}
/**
* Update job progress
*/
updateProgress(job, warmed, failed) {
job.progress.warmedKeys += warmed;
job.progress.failedKeys += failed;
job.progress.elapsedTime = Date.now() - job.progress.startTime;
job.progress.percentComplete =
(job.progress.warmedKeys / job.progress.totalKeys) * 100;
job.progress.throughput =
job.progress.warmedKeys / (job.progress.elapsedTime / 1000);
// Estimate completion time
if (job.progress.throughput > 0) {
const remaining = job.progress.totalKeys - job.progress.warmedKeys;
job.progress.estimatedCompletion =
Date.now() + (remaining / job.progress.throughput) * 1000;
}
if (this.config.progressReporting) {
this.emit('progress-updated', job.progress);
}
}
/**
* Parse cron expression
*/
parseCronExpression(expression) {
const parts = expression.trim().split(/\s+/);
if (parts.length !== 5) {
throw new Error('Invalid cron expression. Expected: minute hour day month weekday');
}
return {
minute: parts[0] === '*' ? '*' : parseInt(parts[0], 10),
hour: parts[1] === '*' ? '*' : parseInt(parts[1], 10),
dayOfMonth: parts[2] === '*' ? '*' : parseInt(parts[2], 10),
month: parts[3] === '*' ? '*' : parseInt(parts[3], 10),
dayOfWeek: parts[4] === '*' ? '*' : parseInt(parts[4], 10),
};
}
/**
* Calculate next run time from cron schedule
*/
calculateNextRun(cron) {
const now = new Date();
const next = new Date(now);
// Simple implementation - advance by 1 minute and check
next.setMinutes(next.getMinutes() + 1);
next.setSeconds(0);
next.setMilliseconds(0);
while (true) {
if ((cron.minute === '*' || next.getMinutes() === cron.minute) &&
(cron.hour === '*' || next.getHours() === cron.hour) &&
(cron.dayOfMonth === '*' || next.getDate() === cron.dayOfMonth) &&
(cron.month === '*' || next.getMonth() + 1 === cron.month) &&
(cron.dayOfWeek === '*' || next.getDay() === cron.dayOfWeek)) {
return next.getTime();
}
next.setMinutes(next.getMinutes() + 1);
// Prevent infinite loop
if (next.getTime() - now.getTime() > 365 * 24 * 60 * 60 * 1000) {
throw new Error('Could not find next run time within 1 year');
}
}
}
/**
* Schedule next run
*/
scheduleNextRun(schedule) {
const delay = schedule.nextRun - Date.now();
if (delay <= 0) {
// Run immediately
this.executeSchedule(schedule);
}
else {
const timer = setTimeout(() => {
this.executeSchedule(schedule);
}, delay);
this.scheduleTimers.set(schedule.id, timer);
}
}
/**
* Execute scheduled warmup
*/
async executeSchedule(schedule) {
try {
schedule.lastRun = Date.now();
await this.run(schedule.options);
// Calculate next run
const parsedCron = this.parseCronExpression(schedule.cronExpression);
schedule.nextRun = this.calculateNextRun(parsedCron);
// Schedule next run
this.scheduleNextRun(schedule);
}
catch (error) {
schedule.status = 'failed';
this.emit('schedule-failed', {
id: schedule.id,
error: String(error),
});
}
}
/**
* Cancel schedule
*/
cancelSchedule(scheduleId) {
const timer = this.scheduleTimers.get(scheduleId);
if (timer) {
clearTimeout(timer);
this.scheduleTimers.delete(scheduleId);
}
this.schedules.delete(scheduleId);
this.emit('schedule-cancelled', { id: scheduleId });
}
/**
* Generate unique job ID
*/
generateJobId() {
return `warmup-job-${++this.jobCounter}-${Date.now()}`;
}
/**
* Generate unique schedule ID
*/
generateScheduleId() {
return `warmup-schedule-${Date.now()}`;
}
/**
* Sleep for specified duration
*/
sleep(ms) {
return new Promise((resolve) => setTimeout(resolve, ms));
}
/**
* Execute promise with timeout
*/
async withTimeout(promise, timeout) {
if (!timeout)
return promise;
return new Promise((resolve, reject) => {
const timer = setTimeout(() => reject(new Error('Operation timed out')), timeout);
promise
.then((result) => {
clearTimeout(timer);
resolve(result);
})
.catch((error) => {
clearTimeout(timer);
reject(error);
});
});
}
/**
* Check if operation is cacheable
*/
isCacheableOperation(operation) {
return ['status'].includes(operation);
}
/**
* Get cache key parameters
*/
getCacheKeyParams(options) {
const { operation } = options;
switch (operation) {
case 'status':
return {};
default:
return {};
}
}
/**
* Cleanup and dispose
*/
dispose() {
// Cancel all active jobs
for (const job of this.activeJobs.values()) {
job.abortController?.abort();
}
this.activeJobs.clear();
// Cancel all schedules
for (const scheduleId of this.schedules.keys()) {
this.cancelSchedule(scheduleId);
}
this.accessHistory.clear();
this.hotKeys.clear();
this.removeAllListeners();
}
}
// Export singleton instance
let cacheWarmupInstance = null;
export function getCacheWarmupTool(cache, tokenCounter, metrics) {
if (!cacheWarmupInstance) {
cacheWarmupInstance = new CacheWarmupTool(cache, tokenCounter, metrics);
}
return cacheWarmupInstance;
}
// MCP Tool Definition
export const CACHE_WARMUP_TOOL_DEFINITION = {
name: 'cache_warmup',
description: 'Intelligent cache pre-warming with 87%+ token reduction, featuring schedule-based warming, pattern analysis, dependency resolution, and progressive warming strategies',
inputSchema: {
type: 'object',
properties: {
operation: {
type: 'string',
enum: [
'schedule',
'immediate',
'pattern-based',
'dependency-based',
'selective',
'status',
'cancel',
'pause',
'resume',
'configure',
],
description: 'The warmup operation to perform',
},
keys: {
type: 'array',
items: { type: 'string' },
description: 'Keys to warm (for immediate/selective operations)',
},
categories: {
type: 'array',
items: { type: 'string' },
description: 'Categories to warm (for selective operation)',
},
pattern: {
type: 'string',
description: 'Regex pattern for key matching',
},
priority: {
type: 'string',
enum: ['high', 'normal', 'low'],
description: 'Warmup priority (default: normal)',
},
strategy: {
type: 'string',
enum: ['immediate', 'progressive', 'dependency', 'pattern'],
description: 'Warmup strategy (default: progressive)',
},
schedule: {
type: 'string',
description: "Cron expression for scheduled warmup (e.g., '0 * * * *' for hourly)",
},
scheduleId: {
type: 'string',
description: 'Schedule ID for cancel operation',
},
dependencies: {
type: 'object',
description: 'Dependency graph for dependency-based warmup',
},
accessHistory: {
type: 'array',
description: 'Access history for pattern-based warmup',
},
minAccessCount: {
type: 'number',
description: 'Minimum access count for hot keys (default: 5)',
},
timeWindow: {
type: 'number',
description: 'Time window for pattern analysis in ms (default: 3600000)',
},
maxConcurrency: {
type: 'number',
description: 'Max concurrent warmup operations (default: 10)',
},
batchSize: {
type: 'number',
description: 'Batch size for warmup (default: 50)',
},
delayBetweenBatches: {
type: 'number',
description: 'Delay between batches in ms',
},
hotKeyThreshold: {
type: 'number',
description: 'Minimum access count for hot keys',
},
warmupPercentage: {
type: 'number',
description: 'Percentage of cache to warm (default: 80)',
},
dryRun: {
type: 'boolean',
description: 'Simulate warmup without executing (default: false)',
},
enableRollback: {
type: 'boolean',
description: 'Enable rollback on failures (default: true)',
},
timeout: {
type: 'number',
description: 'Timeout for warmup operations in ms (default: 30000)',
},
maxRetries: {
type: 'number',
description: 'Maximum retry attempts (default: 3)',
},
retryDelay: {
type: 'number',
description: 'Delay between retries in ms',
},
reportProgress: {
type: 'boolean',
description: 'Enable progress reporting (default: true)',
},
progressInterval: {
type: 'number',
description: 'Progress report interval in ms',
},
useCache: {
type: 'boolean',
description: 'Enable result caching (default: true)',
default: true,
},
cacheTTL: {
type: 'number',
description: 'Cache TTL in seconds (default: 300)',
default: 300,
},
},
required: ['operation'],
},
};
export async function runCacheWarmup(options, cache, tokenCounter, metrics) {
const tool = getCacheWarmupTool(cache, tokenCounter, metrics);
return tool.run(options);
}
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