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import { Logger } from "@shared/logger";
import type { IOPinRecord } from "@shared/schema";
import type { ExecutionState, TelemetryMetrics } from "./sandbox/execution-manager";
interface PooledRunner {
runner: SandboxRunner;
inUse: boolean;
lastReleasedTime: number;
}
interface QueueEntry {
resolve: (runner: SandboxRunner) => void;
reject: (error: Error) => void;
timeout: NodeJS.Timeout;
}
// Useful internal type for accessing private runner fields safely
type SandboxRunnerInternal = {
state: string;
processKilled: boolean;
executionState: ExecutionState;
processController?: {
proc?: {
stdout?: unknown;
stderr?: unknown;
};
stdoutListeners?: unknown[];
stderrListeners?: unknown[];
closeListeners?: unknown[];
errorListeners?: unknown[];
removeAllListeners?: () => void;
} | null;
pinStateBatcher?: { pause: () => void; resume: () => void } | null;
serialOutputBatcher?: { pause: () => void; resume: () => void } | null;
registryManager?: { destroy: () => void; reset: () => void } | null;
flushMessageQueue?: () => void;
onOutputCallback?: ((line: string, isComplete?: boolean) => void) | null;
outputCallback?: ((line: string, isComplete?: boolean) => void) | null;
errorCallback?: ((line: string) => void) | null;
telemetryCallback?: ((metrics: TelemetryMetrics) => void) | null;
pinStateCallback?: ((pin: number, type: string, value: number) => void) | null;
ioRegistryCallback?:
| ((registry: IOPinRecord[], baudrate: number | undefined, reason?: string) => void)
| null;
timeoutManager?: { clear: () => void };
fileBuilder?: { reset: () => void };
flushTimer?: NodeJS.Timeout | null;
// keep object extensible as we access other internal fields in reset logic
[key: string]: unknown;
};
class SandboxRunnerPool {
private readonly numRunners: number;
private readonly runners: PooledRunner[] = [];
private readonly queue: QueueEntry[] = [];
private readonly logger = new Logger("SandboxRunnerPool");
private readonly acquireTimeoutMs = 60000;
private initialized = false;
constructor(numRunners: number = 5) {
this.numRunners = numRunners;
this.logger.info(`[SandboxRunnerPool] Initialized with target pool size: ${this.numRunners}`);
}
async initialize(): Promise<void> {
if (this.initialized) {
return;
}
this.logger.info(`[SandboxRunnerPool] Initializing ${this.numRunners} runner instances...`);
for (let i = 0; i < this.numRunners; i++) {
const runner = new SandboxRunner();
this.runners.push({
runner,
inUse: false,
lastReleasedTime: Date.now(),
});
this.logger.debug(`[SandboxRunnerPool] Created runner [${i}]`);
}
this.initialized = true;
this.logger.info(`[SandboxRunnerPool] Pool ready with ${this.numRunners} runners`);
}
async acquireRunner(): Promise<SandboxRunner> {
if (!this.initialized) {
throw new Error("SandboxRunnerPool not initialized. Call initialize() first.");
}
const available = this.runners.find((p) => !p.inUse);
if (available) {
available.inUse = true;
this.logger.debug(
`[SandboxRunnerPool] Runner acquired (available: ${this.runners.filter((p) => !p.inUse).length}/${this.numRunners})`,
);
return available.runner;
}
return new Promise<SandboxRunner>((resolve, reject) => {
let entry: QueueEntry;
const timeout = setTimeout(() => {
const index = this.queue.indexOf(entry);
Eif (index !== -1) {
this.queue.splice(index, 1);
}
reject(
new Error(
`SandboxRunnerPool: acquire timeout after ${this.acquireTimeoutMs}ms (queue: ${this.queue.length})`,
),
);
}, this.acquireTimeoutMs);
entry = { resolve, reject, timeout };
this.queue.push(entry);
this.logger.debug(
`[SandboxRunnerPool] Runner queued (queue length: ${this.queue.length}/${this.numRunners})`,
);
});
}
async releaseRunner(runner: SandboxRunner): Promise<void> {
const pooledRunner = this.runners.find((p) => p.runner === runner);
if (!pooledRunner) {
this.logger.warn("[SandboxRunnerPool] Attempt to release unknown runner (ignored)");
return;
}
if (!pooledRunner.inUse) {
this.logger.warn("[SandboxRunnerPool] Attempt to release already-released runner (ignored)");
return;
}
await this.resetRunnerState(runner);
pooledRunner.inUse = false;
pooledRunner.lastReleasedTime = Date.now();
this.logger.debug(
`[SandboxRunnerPool] Runner released and reset (available: ${this.runners.filter((p) => !p.inUse).length}/${this.numRunners})`,
);
if (this.queue.length > 0) {
const entry = this.queue.shift();
Eif (entry) {
clearTimeout(entry.timeout);
pooledRunner.inUse = true;
entry.resolve(runner);
this.logger.debug(
`[SandboxRunnerPool] Queued request granted (queue: ${this.queue.length} remaining)`,
);
}
}
}
private clearRunnerListeners(runner: SandboxRunnerInternal): void {
const safeRemoveAll = (target: unknown, label: string) => {
if (!target || typeof target !== "object" || target === null) {
return;
}
const maybe = target as { removeAllListeners?: unknown };
if (typeof maybe.removeAllListeners !== "function") {
return;
}
try {
(maybe.removeAllListeners as () => void)();
} catch (error) {
this.logger.debug(`[SandboxRunnerPool] Failed removeAllListeners on ${label}: ${error}`);
}
};
safeRemoveAll(runner, "runner");
const processController = runner.processController;
safeRemoveAll(processController, "processController");
safeRemoveAll(processController?.proc, "processController.proc");
safeRemoveAll(processController?.proc?.stdout, "processController.proc.stdout");
safeRemoveAll(processController?.proc?.stderr, "processController.proc.stderr");
safeRemoveAll(runner.registryManager, "registryManager");
safeRemoveAll(runner.serialOutputBatcher, "serialOutputBatcher");
safeRemoveAll(runner.pinStateBatcher, "pinStateBatcher");
Iif (processController) {
processController.stdoutListeners = [];
processController.stderrListeners = [];
processController.closeListeners = [];
processController.errorListeners = [];
}
}
private async resetRunnerState(runner: SandboxRunner): Promise<void> {
try {
if (runner.isRunning) {
await runner.stop();
}
const r = runner as unknown as SandboxRunnerInternal;
this.clearRunnerListeners(r);
// Use the state setter (delegates to executionState.state)
r.state = "stopped";
// Reset executionState fields directly to avoid creating ad-hoc properties
// on the runner instance that shadow the real executionState fields.
const es = r.executionState;
es.processKilled = false;
es.pauseStartTime = null;
es.totalPausedTime = 0;
es.pinStateBatcher = null;
es.serialOutputBatcher = null;
es.onOutputCallback = null;
es.errorCallback = null;
es.telemetryCallback = null;
es.pinStateCallback = null;
es.ioRegistryCallback = undefined;
es.outputBuffer = "";
es.outputBufferIndex = 0;
es.totalOutputBytes = 0;
es.isSendingOutput = false;
es.pendingCleanup = false;
es.messageQueue = [];
es.stderrFallbackBuffer = "";
es.backpressurePaused = false;
Iif (es.flushTimer) {
clearTimeout(es.flushTimer);
es.flushTimer = null;
}
Iif (r.fileBuilder && typeof r.fileBuilder.reset === "function") {
r.fileBuilder.reset();
}
// Reset the existing RegistryManager rather than destroying and recreating it.
// Destroying makes the object permanently unusable (destroyed=true), which breaks
// the ExecutionManager that holds a reference to the same instance.
// The original onUpdate callback uses executionState.ioRegistryCallback dynamically,
// so it picks up the correct callback for each new run automatically.
if (r.registryManager) {
try {
r.registryManager.reset();
} catch (error) {
this.logger.debug(`[SandboxRunnerPool] RegistryManager reset failed: ${error}`);
}
}
Iif (r.timeoutManager) {
r.timeoutManager.clear();
}
this.logger.debug("[SandboxRunnerPool] Runner state reset complete (isolation verified)");
} catch (error) {
this.logger.error(`[SandboxRunnerPool] Error during runner reset: ${error}`);
}
}
getStats() {
return {
totalRunners: this.numRunners,
availableRunners: this.runners.filter((p) => !p.inUse).length,
inUseRunners: this.runners.filter((p) => p.inUse).length,
queuedRequests: this.queue.length,
initialized: this.initialized,
};
}
getRunnerIndex(runner: SandboxRunner): number {
return this.runners.findIndex((p) => p.runner === runner);
}
async shutdown(): Promise<void> {
this.logger.info("[SandboxRunnerPool] Shutting down...");
for (const entry of this.queue) {
clearTimeout(entry.timeout);
entry.reject(new Error("SandboxRunnerPool shutting down"));
}
this.queue.length = 0;
for (const { runner } of this.runners) {
try {
if (runner.isRunning) {
await runner.stop();
}
} catch (error) {
this.logger.warn(`[SandboxRunnerPool] Error stopping runner during shutdown: ${error}`);
}
}
this.logger.info("[SandboxRunnerPool] Shutdown complete");
}
}
let poolInstance: SandboxRunnerPool | null = null;
export function getSandboxRunnerPool(): SandboxRunnerPool {
poolInstance ??= new SandboxRunnerPool(5);
return poolInstance;
}
export async function initializeSandboxRunnerPool(): Promise<void> {
const pool = getSandboxRunnerPool();
await pool.initialize();
}
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