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import { type ImapConfig, ImapSync } from "./imap-sync.js";
export interface PooledConnection {
sync: ImapSync;
connectorId: number;
lastUsed: number;
busy: boolean;
}
export interface ConnectionPoolOptions {
/** Max connections per connector (default: 1) */
maxPerConnector?: number;
/** Max total connections across all connectors (default: 10) */
maxTotal?: number;
/** Idle timeout in ms before a connection is closed (default: 5 minutes) */
idleTimeoutMs?: number;
}
const DEFAULT_MAX_PER_CONNECTOR = 1;
const DEFAULT_MAX_TOTAL = 10;
const DEFAULT_IDLE_TIMEOUT_MS = 5 * 60 * 1000;
/**
* Manages a pool of IMAP connections across multiple inbound connectors.
*
* Reuses existing connections when possible, enforces per-connector
* and total connection limits, and cleans up idle connections.
*/
export class ConnectionPool {
private connections: Map<number, PooledConnection[]> = new Map();
private db: Database.Database;
private maxPerConnector: number;
private maxTotal: number;
private idleTimeoutMs: number;
private cleanupTimer: ReturnType<typeof setInterval> | null = null;
constructor(db: Database.Database, options: ConnectionPoolOptions = {}) {
this.db = db;
this.maxPerConnector = options.maxPerConnector ?? DEFAULT_MAX_PER_CONNECTOR;
this.maxTotal = options.maxTotal ?? DEFAULT_MAX_TOTAL;
this.idleTimeoutMs = options.idleTimeoutMs ?? DEFAULT_IDLE_TIMEOUT_MS;
// Periodically clean up idle connections
this.cleanupTimer = setInterval(() => this.evictIdle(), this.idleTimeoutMs);
}
/**
* Acquires an IMAP sync instance for the given inbound connector.
* Reuses an idle connection if available, or creates a new one.
*/
async acquire(connectorId: number, config: ImapConfig): Promise<ImapSync> {
const connectorConns = this.connections.get(connectorId) ?? [];
// Discard idle connections — ImapFlow instances can't be reused after
// ungraceful shutdown and there's no reliable way to check liveness.
// Always create a fresh connection for each sync cycle.
const idleIdx = connectorConns.findIndex((c) => !c.busy);
if (idleIdx !== -1) {
const [stale] = connectorConns.splice(idleIdx, 1);
stale.sync.disconnect().catch(() => {});
Eif (connectorConns.length === 0) {
this.connections.delete(connectorId);
}
}
// Check per-connector limit
if (connectorConns.length >= this.maxPerConnector) {
throw new Error(
`Connection limit reached for connector ${connectorId} (max: ${this.maxPerConnector})`,
);
}
// Check total limit — evict oldest idle connection if at capacity
if (this.totalConnections() >= this.maxTotal) {
const evicted = this.evictOldestIdle();
Eif (!evicted) {
throw new Error(
`Total connection limit reached (max: ${this.maxTotal}), all connections busy`,
);
}
}
// Create new connection
const sync = new ImapSync(config, this.db, connectorId);
try {
await sync.connect();
} catch (err) {
// Force-close the failed client to release the underlying TCP socket
// and prevent async teardown events from leaking after the error.
sync.forceClose();
throw err;
}
const pooled: PooledConnection = {
sync,
connectorId,
lastUsed: Date.now(),
busy: true,
};
Eif (!this.connections.has(connectorId)) {
this.connections.set(connectorId, []);
}
this.connections.get(connectorId)?.push(pooled);
return sync;
}
/**
* Releases a connection back to the pool for reuse.
*/
release(connectorId: number, sync: ImapSync): void {
const connectorConns = this.connections.get(connectorId);
if (!connectorConns) return;
const pooled = connectorConns.find((c) => c.sync === sync);
if (pooled) {
pooled.busy = false;
pooled.lastUsed = Date.now();
}
}
/**
* Closes all connections and stops the cleanup timer.
* Uses force-close to avoid hanging on LOGOUT when connections are
* mid-FETCH (e.g., during process shutdown).
*/
async shutdown(): Promise<void> {
if (this.cleanupTimer) {
clearInterval(this.cleanupTimer);
this.cleanupTimer = null;
}
for (const [, conns] of this.connections) {
for (const conn of conns) {
conn.sync.forceClose();
}
}
this.connections.clear();
}
/**
* Returns the total number of active connections.
*/
totalConnections(): number {
let total = 0;
for (const [, conns] of this.connections) {
total += conns.length;
}
return total;
}
/**
* Returns the number of connections for a specific connector.
*/
connectorConnections(connectorId: number): number {
return this.connections.get(connectorId)?.length ?? 0;
}
/**
* Evicts connections that have been idle longer than the timeout.
*/
private evictIdle(): void {
const now = Date.now();
for (const [connectorId, conns] of this.connections) {
const remaining: PooledConnection[] = [];
for (const conn of conns) {
if (!conn.busy && now - conn.lastUsed > this.idleTimeoutMs) {
conn.sync.disconnect().catch(() => {});
} else {
remaining.push(conn);
}
}
if (remaining.length === 0) {
this.connections.delete(connectorId);
} else {
this.connections.set(connectorId, remaining);
}
}
}
/**
* Evicts the oldest idle connection across all connectors.
* Returns true if a connection was evicted.
*/
private evictOldestIdle(): boolean {
let oldest: { connectorId: number; index: number; lastUsed: number } | null = null;
for (const [connectorId, conns] of this.connections) {
for (let i = 0; i < conns.length; i++) {
if (!conns[i].busy) {
if (!oldest || conns[i].lastUsed < oldest.lastUsed) {
oldest = { connectorId, index: i, lastUsed: conns[i].lastUsed };
}
}
}
}
if (!oldest) return false;
const conns = this.connections.get(oldest.connectorId);
Iif (!conns) return false;
const [removed] = conns.splice(oldest.index, 1);
removed.sync.disconnect().catch(() => {});
if (conns.length === 0) {
this.connections.delete(oldest.connectorId);
}
return true;
}
}
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