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import { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
import { packageName, packageVersion, GITLAB_BASE_URL } from './config';
import { setupHandlers } from './handlers';
import { setDetectedSchemaMode } from './utils/schema-utils';
import { logInfo, logWarn, logError, logDebug } from './logger';
import { normalizeInstanceUrl } from './utils/url';
/** Default session idle timeout: 30 minutes */
const DEFAULT_SESSION_TIMEOUT_MS = 30 * 60 * 1000;
/** Well-known session ID for stdio transport — exempt from idle timeout */
export const STDIO_SESSION_ID = 'stdio';
interface ManagedSession {
server: Server;
sessionId: string;
createdAt: number;
lastActivityAt: number;
/** GitLab instance URL this session is targeting. Defaults to GITLAB_BASE_URL. */
instanceUrl: string;
}
/**
* Manages per-session MCP Server instances.
*
* Each connected client gets its own Server instance, preventing the transport
* routing bug where a single Server's `_transport` field gets overwritten by
* each new connection, causing responses to be sent to the wrong client.
*/
export class SessionManager {
private sessions = new Map<string, ManagedSession>();
private cleanupInterval: ReturnType<typeof setInterval> | null = null;
private readonly sessionTimeoutMs: number;
private schemaModeDetected = false;
constructor(sessionTimeoutMs?: number) {
this.sessionTimeoutMs = sessionTimeoutMs ?? DEFAULT_SESSION_TIMEOUT_MS;
}
/**
* Initialize the session manager and start the cleanup timer.
* Must be called once before creating sessions.
*/
start(): void {
// Run cleanup every minute
this.cleanupInterval = setInterval(() => {
this.cleanupStaleSessions();
}, 60_000);
// Don't keep the process alive just for cleanup
this.cleanupInterval.unref();
logInfo('Session manager started', { sessionTimeoutMs: this.sessionTimeoutMs });
}
/**
* Create a new per-session Server instance and connect it to the given transport.
* Handlers are registered identically on each instance.
*
* @param instanceUrl - GitLab instance URL for this session. Defaults to GITLAB_BASE_URL.
* Updated on each tool call: in OAuth mode when the token context resolves the actual
* instance URL; in static-token mode when ConnectionManager reflects an instance change.
*/
async createSession(
sessionId: string,
transport: Transport,
instanceUrl?: string,
): Promise<Server> {
// Guard against duplicate session IDs — close existing before allocating new resources
if (this.sessions.has(sessionId)) {
logWarn('Duplicate sessionId detected — closing existing session', { sessionId });
await this.removeSession(sessionId);
}
const server = new Server(
{ name: packageName, version: packageVersion },
{ capabilities: { tools: { listChanged: true } } },
);
// Auto-detect schema mode from the first client to initialize.
// Only the first session sets the mode to avoid race conditions.
server.oninitialized = () => {
if (!this.schemaModeDetected) {
this.schemaModeDetected = true;
const clientVersion = server.getClientVersion();
setDetectedSchemaMode(clientVersion?.name);
}
};
// Register request handlers (idempotent — same logic for every session)
await setupHandlers(server);
await server.connect(transport);
const now = Date.now();
this.sessions.set(sessionId, {
server,
sessionId,
createdAt: now,
lastActivityAt: now,
instanceUrl: normalizeInstanceUrl(instanceUrl ?? GITLAB_BASE_URL),
});
logInfo('Session created', { sessionId, activeSessions: this.sessions.size });
return server;
}
/**
* Mark session as active (extends timeout).
*/
touchSession(sessionId: string): void {
const session = this.sessions.get(sessionId);
if (session) {
session.lastActivityAt = Date.now();
}
}
/**
* Update the GitLab instance URL for an active session.
* Called by the tool handler when the effective instance URL is resolved:
* - OAuth mode: updated on each tool call when the token context provides the URL
* - Static-token mode: updated on each tool call from ConnectionManager's active instance
*/
setSessionInstanceUrl(sessionId: string, url: string): void {
const normalizedUrl = normalizeInstanceUrl(url);
const session = this.sessions.get(sessionId);
if (session && session.instanceUrl !== normalizedUrl) {
session.instanceUrl = normalizedUrl;
logDebug('Session instance URL updated', { sessionId, instanceUrl: normalizedUrl });
// Notify the session so the client re-fetches the tool list for the new instance.
void session.server
.notification({ method: 'notifications/tools/list_changed' })
.catch((error: unknown) => {
logDebug('Failed to notify session of tool list change after instance URL update', {
sessionId,
instanceUrl: normalizedUrl,
err: error,
});
});
}
}
/**
* Get the GitLab instance URL associated with a session.
* Returns undefined if the session does not exist.
*/
getSessionInstanceUrl(sessionId: string): string | undefined {
return this.sessions.get(sessionId)?.instanceUrl;
}
/**
* Return a map of instance URL → session count across all active sessions.
* Used by the dashboard to show per-instance session distribution.
*/
getSessionsByInstance(): Map<string, number> {
const counts = new Map<string, number>();
for (const session of this.sessions.values()) {
counts.set(session.instanceUrl, (counts.get(session.instanceUrl) ?? 0) + 1);
}
return counts;
}
/**
* Remove a session and close its Server instance.
*/
async removeSession(sessionId: string): Promise<void> {
const session = this.sessions.get(sessionId);
if (!session) return;
this.sessions.delete(sessionId);
try {
await session.server.close();
} catch (error) {
logDebug('Error closing session server (may already be closed)', { err: error, sessionId });
}
logInfo('Session removed', { sessionId, activeSessions: this.sessions.size });
}
/**
* Send tools/list_changed notification to active sessions.
*
* @param instanceUrl - When provided, only sessions targeting this instance are notified.
* When omitted, all sessions are notified. Use the filtered form when a state change
* affects only one instance (e.g. HealthMonitor state transition) to avoid spurious
* re-fetches in sessions targeting unrelated instances.
*/
async broadcastToolsListChanged(instanceUrl?: string): Promise<void> {
// Normalize before comparing — session.instanceUrl is always stored normalized,
// so the filter must also be normalized to ensure consistent matching.
const normalizedFilter =
instanceUrl !== undefined ? normalizeInstanceUrl(instanceUrl) : undefined;
const promises: Promise<void>[] = [];
for (const [sessionId, session] of this.sessions) {
// Skip sessions targeting a different instance when a filter is active
if (normalizedFilter !== undefined && session.instanceUrl !== normalizedFilter) {
continue;
}
promises.push(
session.server
.notification({ method: 'notifications/tools/list_changed' })
.then(() => {
logDebug('Sent tools/list_changed to session', { sessionId });
})
.catch((error: unknown) => {
logDebug('Failed to send tools/list_changed to session', { err: error, sessionId });
}),
);
}
await Promise.allSettled(promises);
logInfo('Broadcast tools/list_changed', {
sessionCount: this.sessions.size,
notifiedCount: promises.length,
instanceUrl: normalizedFilter ?? 'all',
});
}
/**
* Get the number of active sessions.
*/
get activeSessionCount(): number {
return this.sessions.size;
}
/**
* Clean up sessions that have been idle beyond the timeout.
*/
private cleanupStaleSessions(): void {
const now = Date.now();
const stale: string[] = [];
for (const [sessionId, session] of this.sessions) {
// stdio is a single-client, single-process transport whose lifetime
// is owned by the client — it must never be evicted by idle timeout.
if (sessionId === STDIO_SESSION_ID) continue;
if (now - session.lastActivityAt > this.sessionTimeoutMs) {
stale.push(sessionId);
}
}
if (stale.length === 0) return;
logInfo('Cleaning up stale sessions', {
staleCount: stale.length,
activeSessions: this.sessions.size,
});
for (const sessionId of stale) {
// Fire-and-forget cleanup
this.removeSession(sessionId).catch((error: unknown) => {
logError('Error during stale session cleanup', { err: error, sessionId });
});
}
}
/**
* Stop the cleanup timer and close all sessions.
*/
async shutdown(): Promise<void> {
Eif (this.cleanupInterval) {
clearInterval(this.cleanupInterval);
this.cleanupInterval = null;
}
const sessionIds = [...this.sessions.keys()];
await Promise.allSettled(sessionIds.map((id) => this.removeSession(id)));
logInfo('Session manager shut down');
}
}
/**
* Singleton session manager instance.
* Used by the server and by context-manager for broadcast notifications.
*/
let sessionManagerInstance: SessionManager | null = null;
export function getSessionManager(): SessionManager {
sessionManagerInstance ??= new SessionManager();
return sessionManagerInstance;
}
/**
* Reset the singleton (for testing).
*/
export function resetSessionManager(): void {
sessionManagerInstance = null;
}
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