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import { WSMessageType } from "@shared/schema";
import type { Logger } from "@shared/logger";
import type { SandboxRunner } from "../../services/sandbox-runner";
import type { SandboxRunnerPool } from "../../services/sandbox-runner-pool";
import { WsSessionLifecycle } from "../../services/ws-session-lifecycle";
import { sendMessageToClient } from "./ws-output-buffer";
import { webSocketMetricsTracker } from "../../services/server-metrics";
import type {
SimulationAdmissionController,
SimulationReservation,
} from "../../services/simulation-admission-controller";
export type ClientState = {
subject: string;
runner: SandboxRunner | null;
isRunning: boolean;
isPaused: boolean;
testRunId?: string;
queueAbortController: AbortController | null;
reservation: SimulationReservation | null;
metricsState?: "running" | "paused" | null;
/**
* In-flight release of this connection's lifecycle. Its reservation is
* already detached from the state, but runner and admission are not yet
* returned; a new start on this connection waits for it.
*/
releasing?: Promise<void> | null;
/** Incremented by stop, code change and disconnect to cancel waiting starts. */
startGeneration?: number;
closed?: boolean;
};
/**
* A connection owns at most one simulation lifecycle: from admission until its
* release has returned runner and admission. Separate connections of the same
* subject remain independent (bounded by the per-subject admission limit).
*/
export function hasSimulationLifecycle(state: ClientState): boolean {
return Boolean(
state.reservation || state.runner || state.queueAbortController || state.releasing,
);
}
interface WsSessionManagerParams {
pool: SandboxRunnerPool;
logger: Logger;
admissionController?: Pick<SimulationAdmissionController, "release">;
}
export class WsSessionManager {
private readonly clientRunners = new WsSessionLifecycle<WebSocket, ClientState>();
constructor(private readonly params: WsSessionManagerParams) {}
register(ws: WebSocket, state: ClientState): void {
state.metricsState ??= null;
webSocketMetricsTracker.onConnection();
this.clientRunners.register(ws, state);
}
markSessionRunning(state: ClientState): void {
if (state.metricsState === "running") return;
state.isRunning = true;
state.isPaused = false;
webSocketMetricsTracker.onSessionStart();
state.metricsState = "running";
}
markSessionPaused(state: ClientState): void {
if (state.metricsState !== "running") return;
state.isRunning = true;
state.isPaused = true;
webSocketMetricsTracker.onSessionPause();
state.metricsState = "paused";
}
markSessionStopped(state: ClientState): void {
if (state.metricsState === null || state.metricsState === undefined) return;
state.isRunning = false;
state.isPaused = false;
webSocketMetricsTracker.onSessionStop(state.metricsState);
state.metricsState = null;
}
get(ws: WebSocket): ClientState | undefined {
return this.clientRunners.get(ws);
}
remove(ws: WebSocket): ClientState | undefined {
const state = this.clientRunners.remove(ws);
if (state) {
webSocketMetricsTracker.onDisconnection();
}
return state;
}
entries(): IterableIterator<[WebSocket, ClientState]> {
return this.clientRunners.entries();
}
get size(): number {
return this.clientRunners.size;
}
countRunningClients(): number {
let count = 0;
for (const state of this.clientRunners.values()) {
if (state.isRunning) count++;
}
return count;
}
broadcastWorkerTotal(excludeWs?: WebSocket): void {
const newTotal = this.countRunningClients();
for (const [otherWs, otherState] of this.clientRunners.entries()) {
if (otherWs !== excludeWs && otherState.isRunning) {
sendMessageToClient(otherWs, {
type: WSMessageType.COMPILATION_STATUS,
workerTotal: newTotal,
});
}
}
}
/**
* Ends the connection's current lifecycle. The reservation is detached
* synchronously, so every async continuation of the old run sees that it no
* longer owns the session; runner and admission are returned before the
* returned promise settles. Concurrent callers join the release in flight.
*/
safeReleaseRunner(
state: ClientState,
reason: string,
expectedReservation: SimulationReservation | null = state.reservation,
): Promise<void> {
if (expectedReservation && state.reservation !== expectedReservation) {
return Promise.resolve();
}
Iif (state.releasing) return state.releasing;
// The settled release clears itself before any waiter resumes.
const release: Promise<void> = this.releaseLifecycle(state, reason, expectedReservation)
.finally(() => {
Eif (state.releasing === release) state.releasing = null;
});
state.releasing = release;
return release;
}
private async releaseLifecycle(
state: ClientState,
reason: string,
expectedReservation: SimulationReservation | null,
): Promise<void> {
if (expectedReservation) state.reservation = null;
const runner = state.runner;
state.runner = null;
const wasRunning = state.isRunning;
state.isRunning = false;
state.isPaused = false;
if (state.metricsState !== null && state.metricsState !== undefined) {
this.markSessionStopped(state);
this.broadcastWorkerTotal();
} else if (wasRunning) {
// Compatibility for callers that construct legacy ClientState objects.
webSocketMetricsTracker.onSessionStop();
this.broadcastWorkerTotal();
}
if (runner) {
try {
await runner.stop();
} catch (error) {
this.params.logger.debug(
`[SandboxRunnerPool] runner.stop() failed during ${reason}: ${error}`,
);
}
try {
await this.params.pool.releaseRunner(runner);
} catch (error) {
this.params.logger.warn(
`[SandboxRunnerPool] releaseRunner failed during ${reason}: ${error}`,
);
}
}
if (expectedReservation) {
this.params.admissionController?.release(expectedReservation);
}
}
/** Cancels a start that is still waiting for this connection's previous release. */
cancelPendingStart(state: ClientState): void {
state.startGeneration = (state.startGeneration ?? 0) + 1;
}
abortQueuedAcquire(state: ClientState): void {
if (state.queueAbortController) {
state.queueAbortController.abort();
state.queueAbortController = null;
}
}
async cleanupClient(ws: WebSocket, reason: string): Promise<void> {
const clientState = this.get(ws);
if (clientState) {
clientState.closed = true;
this.cancelPendingStart(clientState);
this.abortQueuedAcquire(clientState);
if (clientState.runner || clientState.reservation) {
await this.safeReleaseRunner(clientState, reason);
}
}
this.remove(ws);
this.broadcastWorkerTotal();
}
}
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