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import { ETagCacheService } from './etag-cache.service';
import { ApplicationStateService } from '../../application-state/application-state.service';
/**
* Entity types that trigger cache invalidation.
*/
export type CacheableEntityType =
| 'session'
| 'session_input'
| 'ai_action'
| 'execution_log'
| 'context_template'
| 'system_prompt'
| 'custom_snippet'
| 'context_snippet'
| 'custom_variable'
| 'project'
| 'tool_hook'
| 'mcp_config'
| 'sub_agent'
| 'sub_agent_run'
| 'application_state'
| 'llm_call_log';
/**
* Context information for invalidation.
*/
export interface InvalidationContext {
sessionId?: string;
parentSessionId?: string;
childSessionId?: string;
isActive?: boolean;
isDefaultChanged?: boolean;
stateKey?: string;
}
/**
* Service that maps entity changes to cache invalidation patterns.
*
* Architecture:
* - TypeORM Subscriber detects entity changes (insert/update/delete)
* - Calls this service with entity type and context
* - This service maps to cache patterns and calls ETagCacheService.invalidatePattern()
*/
@Injectable()
export class CacheInvalidationService {
private readonly logger = new Logger(CacheInvalidationService.name);
/**
* Static singleton instance for access from TypeORM subscriber.
* TypeORM subscribers are instantiated by TypeORM's container, not NestJS DI.
* This allows the subscriber to access the service without constructor injection.
*/
private static instance: CacheInvalidationService;
constructor(
private readonly etagCacheService: ETagCacheService,
@Inject(forwardRef(() => ApplicationStateService))
private readonly applicationStateService: ApplicationStateService,
) {
// Set singleton instance on creation
CacheInvalidationService.instance = this;
}
/**
* Get the singleton instance of this service.
* Used by CacheInvalidationSubscriber which doesn't have NestJS DI access.
*
* @returns The service instance, or null if not yet initialized
*/
static getInstance(): CacheInvalidationService | null {
return CacheInvalidationService.instance;
}
/**
* Invalidate cache entries for a specific entity change.
*
* @param entityType The type of entity that changed
* @param context Context information (sessionId, isActive, etc.)
*/
async invalidateEntity(
entityType: CacheableEntityType,
context: InvalidationContext = {},
): Promise<void> {
this.logger.debug(
`Invalidating cache for entity: ${entityType}, context: ${JSON.stringify(context)}`,
);
// Get patterns based on entity type
const patterns = await this.getPatternsForEntity(entityType, context);
// Invalidate each pattern
for (const pattern of patterns) {
this.logger.debug(`Invalidating pattern: ${pattern}`);
this.etagCacheService.invalidatePattern(pattern);
}
this.logger.log(
`Cache invalidation complete for ${entityType}: ${patterns.length} patterns`,
);
}
/**
* Get cache patterns to invalidate for an entity type.
*/
private async getPatternsForEntity(
entityType: CacheableEntityType,
context: InvalidationContext,
): Promise<string[]> {
// Resolve isActive if sessionId provided but not explicitly set
if (context.sessionId && context.isActive === undefined) {
context.isActive = await this.checkIfActiveSession(context.sessionId);
}
switch (entityType) {
case 'session':
return this.getSessionPatterns(context);
case 'session_input':
return this.getSessionInputPatterns(context);
case 'ai_action':
return this.getAIActionPatterns(context);
case 'execution_log':
return this.getExecutionLogPatterns(context);
case 'context_template':
return this.getContextTemplatePatterns(context);
case 'system_prompt':
return this.getSystemPromptPatterns(context);
case 'custom_snippet':
return ['/custom-snippets*'];
case 'context_snippet':
return ['/context-snippets*'];
case 'custom_variable':
return ['/custom-variables*'];
case 'project':
return this.getProjectPatterns(context);
case 'tool_hook':
return ['/tool-hooks*', '/system-prompts*'];
case 'mcp_config':
return ['/mcp-configs*', '/mcp-tools*', '/system-prompts*'];
case 'sub_agent':
return ['/sub-agents*', '/sessions*'];
case 'sub_agent_run':
return this.getSubAgentRunPatterns(context);
case 'application_state':
return this.getApplicationStatePatterns(context);
case 'llm_call_log':
return ['/llm-call-logs*'];
default:
return [];
}
}
/**
* Session invalidation patterns.
*
* When a session changes:
* - Invalidate session list (sessionInputCount may change)
* - Invalidate this session's endpoints
* - Invalidate active session (if this is/was active)
* - Invalidate application state (activeSessionId)
*/
private getSessionPatterns(context: InvalidationContext): string[] {
const patterns: string[] = ['/sessions*'];
if (context.sessionId) {
// Match all endpoints for this specific session
// Pattern: /sessions/{id}* covers:
// - /sessions/{id}
// - /sessions/{id}?includeLogs=true
// - /sessions/{id}/inputs
// - /sessions/{id}/inputs/{inputId}
// - /sessions/{id}/file-changes
// - /sessions/{id}/child-sessions
// - /sessions/{id}/export
// - /sessions/{id}/clone
patterns.push(`/sessions/${context.sessionId}*`);
}
if (context.isActive) {
patterns.push('/sessions/active*');
}
// Application state always changes when session changes
patterns.push('/application-state*');
return patterns;
}
/**
* SessionInput invalidation patterns.
*
* When a session input changes:
* - Invalidate parent session (sessionInputs relation)
* - Invalidate session list (sessionInputCount)
* - Invalidate active session (if parent is active)
*/
private getSessionInputPatterns(context: InvalidationContext): string[] {
const patterns: string[] = [];
if (context.sessionId) {
patterns.push(`/sessions/${context.sessionId}*`);
}
// Session list changes (sessionInputCount)
patterns.push('/sessions*');
if (context.isActive) {
patterns.push('/sessions/active*');
}
return patterns;
}
/**
* AIAction invalidation patterns.
*
* When an AI action changes:
* - Invalidate grandparent session (aiActions relation on sessionInputs)
* - Invalidate session list (action count may affect display)
* - Invalidate active session (if grandparent is active)
*/
private getAIActionPatterns(context: InvalidationContext): string[] {
const patterns: string[] = [];
if (context.sessionId) {
patterns.push(`/sessions/${context.sessionId}*`);
}
patterns.push('/sessions*');
Iif (context.isActive) {
patterns.push('/sessions/active*');
}
// AI actions endpoints (if any direct endpoints exist)
patterns.push('/ai-actions*');
return patterns;
}
/**
* ExecutionLog invalidation patterns.
*
* When an execution log changes:
* - Invalidate session (executionLogs loaded on sessionInputs.aiActions)
* - Invalidate active session (if session is active)
*/
private getExecutionLogPatterns(context: InvalidationContext): string[] {
const patterns: string[] = [];
if (context.sessionId) {
patterns.push(`/sessions/${context.sessionId}*`);
}
Iif (context.isActive) {
patterns.push('/sessions/active*');
}
return patterns;
}
/**
* ContextTemplate invalidation patterns.
*
* When a context template changes:
* - Invalidate context templates list
* - Invalidate sessions (if this is a default template)
*/
private getContextTemplatePatterns(_context: InvalidationContext): string[] {
const patterns: string[] = ['/context-templates*'];
// If default flags changed, invalidate sessions (they reference templates)
// Also invalidate on any change since sessions may have loaded this template
patterns.push('/sessions*');
return patterns;
}
/**
* SystemPrompt invalidation patterns.
*
* When a system prompt changes:
* - Invalidate system prompts list
* - Invalidate sessions (sessions reference system prompts)
* - Invalidate sub-agents (sub-agents reference system prompts)
*/
private getSystemPromptPatterns(_context: InvalidationContext): string[] {
return ['/system-prompts*', '/sessions*', '/sub-agents*'];
}
/**
* Project invalidation patterns.
*
* When a project changes:
* - Invalidate projects list
* - Invalidate sessions (sessions may reference project)
*/
private getProjectPatterns(_context: InvalidationContext): string[] {
return ['/projects*', '/sessions*'];
}
/**
* SubAgentRun invalidation patterns.
*
* When a sub-agent run changes:
* - Invalidate sub-agent runs list
* - Invalidate parent session (shows subAgentRuns)
* - Invalidate child session (created by run)
* - Invalidate sessions list
*/
private getSubAgentRunPatterns(context: InvalidationContext): string[] {
const patterns: string[] = ['/sub-agent-runs*', '/sessions*'];
if (context.parentSessionId) {
patterns.push(`/sessions/${context.parentSessionId}*`);
}
if (context.childSessionId) {
patterns.push(`/sessions/${context.childSessionId}*`);
}
return patterns;
}
/**
* ApplicationState invalidation patterns.
*
* When application state changes:
* - Invalidate application state batch endpoint
* - Invalidate sessions/active if activeSessionId changed
*/
private getApplicationStatePatterns(context: InvalidationContext): string[] {
const patterns: string[] = ['/application-state*'];
// If activeSessionId changed, invalidate session endpoints
if (context.stateKey === 'activeSessionId') {
patterns.push('/sessions*', '/sessions/active*');
}
return patterns;
}
/**
* Check if a session is the current active session.
*/
private async checkIfActiveSession(sessionId: string): Promise<boolean> {
try {
const activeSessionId =
await this.applicationStateService.getActiveSessionId();
return sessionId === activeSessionId;
} catch (error) {
this.logger.warn(
`Could not check active session: ${error.message}. Assuming not active.`,
);
return false;
}
}
/**
* Batch invalidation for multiple entities.
* Useful for operations that affect multiple entity types.
*/
async invalidateEntities(
entities: Array<{
type: CacheableEntityType;
context: InvalidationContext;
}>,
): Promise<void> {
// Collect all unique patterns
const allPatterns = new Set<string>();
for (const { type, context } of entities) {
const patterns = await this.getPatternsForEntity(type, context);
patterns.forEach((p) => allPatterns.add(p));
}
// Invalidate all patterns
for (const pattern of allPatterns) {
this.logger.debug(`Invalidating pattern: ${pattern}`);
this.etagCacheService.invalidatePattern(pattern);
}
this.logger.log(
`Batch invalidation complete: ${allPatterns.size} unique patterns`,
);
}
}
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