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import fs from "node:fs";
import http from "node:http";
import os from "node:os";
import path from "node:path";
import { promisify } from "node:util";
import WebSocket from "ws";
import { runRestCompileBatch, type RestCompileBatchMeasurement } from "./capacity-rest-compile";
import { createDockerLifecycleTracker } from "./capacity-docker-events";
const execFileAsync = promisify(execFile);
export type ScenarioKind = "burst" | "classroom";
export type CapacityScenarioOptions = {
baseUrl: string;
runId: string;
scenario: ScenarioKind;
clientCount: number;
holdDurationMs: number;
simulationTimeoutSec: number;
arrivalWindowMs?: number;
/** Optional cache-unique REST compile cohort run concurrently with simulations. */
restCompileCount?: number;
restCompileConcurrency?: number;
restCompileTimeoutMs?: number;
outputDir?: string;
expectedSimulationMaxConcurrent?: number;
expectedSandboxStartMaxConcurrent?: number;
requiredAdmissionMax?: number;
expectedSimulationQueueTimeoutMs?: number;
};
export type ClientResult = {
clientId: number;
connected: boolean;
started: boolean;
requestedAtMs: number;
connectedAtMs: number | null;
/** WebSocket-open is not application admission; retained only for compatibility. */
admittedAtMs: number | null;
queueEnteredAtMs: number | null;
simulationSlotAcquiredAtMs: number | null;
/** Deprecated compatibility fields; authoritative waits come from status samples. */
startupSlotWaitBeganAtMs: number | null;
/** Deprecated compatibility fields; authoritative waits come from status samples. */
startupSlotAcquiredAtMs: number | null;
startupBeganAtMs: number | null;
runtimeStartedAtMs: number | null;
completedAtMs: number | null;
terminalAtMs: number | null;
disconnectedAtMs: number | null;
startLatencyMs: number | null;
queueWaitMs: number | null;
/** Never inferred from WebSocket messages; populated only by aggregation. */
startupSlotWaitMs: number | null;
startupDurationMs: number | null;
runtimeDurationMs: number | null;
operationErrorCodes: string[];
errors: string[];
outcome: ClientOutcome;
};
export type ClientOutcome = "success" | "rejected" | "failed" | "incomplete";
export function classifyClientOutcome(
client: Pick<ClientResult, "started" | "runtimeStartedAtMs" | "completedAtMs" | "operationErrorCodes" | "errors">,
): ClientOutcome {
if (client.operationErrorCodes.includes("SYSTEM_BUSY")) return "rejected";
if (client.operationErrorCodes.length > 0 || client.errors.length > 0) return "failed";
Eif (client.started && client.runtimeStartedAtMs !== null && client.completedAtMs !== null) return "success";
return "incomplete";
}
export function countClientOutcomes(
clients: Array<Pick<ClientResult, "started" | "runtimeStartedAtMs" | "completedAtMs" | "operationErrorCodes" | "errors">>,
): { requested: number; started: number; successful: number; rejected: number; failed: number; incomplete: number } {
const counts = { requested: clients.length, started: 0, successful: 0, rejected: 0, failed: 0, incomplete: 0 };
for (const client of clients) {
if (client.started) counts.started++;
const outcome = classifyClientOutcome(client);
if (outcome === "success") counts.successful++;
else counts[outcome]++;
}
return counts;
}
export type StatusSnapshot = {
/** Wall-clock sample time added by the harness for workload correlation. */
sampledAtMs?: number;
status?: string;
serverMode?: string;
capacityTestRunId?: string;
capacityTest?: {
/** Raw waits measured by the backend sandbox-start semaphore. */
sandboxStartWaitSamplesMs: number[];
};
capacity?: {
simulation?: { maxConcurrent: number; active: number };
sandboxStart?: { maxConcurrent: number; active: number; waiting: number; slotTimeoutMs: number };
admission?: { max: number; current: number };
queue?: { waiting: number; timeoutMs: number };
compile?: { maxConcurrent: number; active: number };
};
compileMetrics?: {
count: number;
timeoutCount: number;
errorCount: number;
avgDurationMs: number;
avgQueueWaitTimeMs: number;
maxDurationMs: number;
maxQueueWaitTimeMs: number;
};
compileWorkerPool?: {
active: number;
queued: number;
totalTasks: number;
completedTasks: number;
failedTasks: number;
avgCompileTimeMs: number;
maxWorkers: number;
liveWorkers: number;
};
};
export type EffectiveCapacityConfiguration = {
simulationMaxConcurrent: number;
sandboxStartMaxConcurrent: number;
simulationAdmissionMax: number;
simulationQueueTimeoutMs: number;
sandboxStartSlotTimeoutMs: number;
dockerControlTimeoutMs: number;
compileMaxConcurrent: number;
};
export class CapacityScenarioConfigurationError extends Error {
readonly code = "CAPACITY_SCENARIO_CONFIGURATION" as const;
constructor(
readonly requirements: {
simulationMaxConcurrent?: number;
sandboxStartMaxConcurrent?: number;
admissionMax?: number;
simulationQueueTimeoutMs?: number;
},
readonly actual: EffectiveCapacityConfiguration,
) {
const mismatches: string[] = [];
Iif (requirements.simulationMaxConcurrent !== undefined
&& actual.simulationMaxConcurrent !== requirements.simulationMaxConcurrent) {
mismatches.push(`simulation max ${actual.simulationMaxConcurrent} (expected ${requirements.simulationMaxConcurrent})`);
}
Iif (requirements.sandboxStartMaxConcurrent !== undefined
&& actual.sandboxStartMaxConcurrent !== requirements.sandboxStartMaxConcurrent) {
mismatches.push(`sandbox-start max ${actual.sandboxStartMaxConcurrent} (expected ${requirements.sandboxStartMaxConcurrent})`);
}
Eif (requirements.admissionMax !== undefined && actual.simulationAdmissionMax < requirements.admissionMax) {
mismatches.push(`admission max ${actual.simulationAdmissionMax} (required at least ${requirements.admissionMax})`);
}
Eif (requirements.simulationQueueTimeoutMs !== undefined
&& actual.simulationQueueTimeoutMs !== requirements.simulationQueueTimeoutMs) {
mismatches.push(`queue timeout ${actual.simulationQueueTimeoutMs}ms (expected ${requirements.simulationQueueTimeoutMs}ms)`);
}
super(`Runtime Capacity configuration cannot represent the requested scenario: ${mismatches.join(", ") || "unknown mismatch"}`);
this.name = "CapacityScenarioConfigurationError";
}
}
const DRIVER_WATCHDOG_MARGIN_MS = 120_000;
export const SCENARIO_CLEANUP_TIMEOUT_MS = 30_000;
export const SCENARIO_CLEANUP_POLL_INTERVAL_MS = 250;
/**
* Derive the client-only safety deadline from the effective server phase
* budgets. This is deliberately not a production timeout or recommendation.
*/
export function deriveClientWatchdogMs(
simulationTimeoutSec: number,
simulationQueueTimeoutMs: number,
sandboxStartSlotTimeoutMs: number,
holdDurationMs: number,
): number {
return Math.max(
simulationTimeoutSec * 1_000 + DRIVER_WATCHDOG_MARGIN_MS,
simulationQueueTimeoutMs + sandboxStartSlotTimeoutMs + holdDurationMs + DRIVER_WATCHDOG_MARGIN_MS,
);
}
export function recordClientWatchdogExpiry(result: Pick<ClientResult, "errors">, timeoutMs: number): void {
result.errors.push(`client watchdog expired after ${timeoutMs}ms`);
}
export function isScenarioQuiescent(status: StatusSnapshot, remainingCapacityContainers: number): boolean {
return remainingCapacityContainers === 0
&& status.capacity?.simulation?.active === 0
&& status.capacity?.queue?.waiting === 0
&& status.capacity?.admission?.current === 0
&& status.capacity?.sandboxStart?.active === 0
&& status.capacity?.sandboxStart?.waiting === 0;
}
export type ScenarioQuiescenceResult = {
quiescent: boolean;
waitedMs: number;
remainingCapacityContainers: number;
activeSimulationCount: number | null;
queueWaiting: number | null;
admissionCurrent: number | null;
sandboxStartActive: number | null;
sandboxStartWaiting: number | null;
};
export type ScenarioQuiescenceOptions = {
baseUrl: string;
runId: string;
getStatus: (baseUrl: string) => Promise<StatusSnapshot>;
countContainers: (runId: string, includeStopped?: boolean) => number;
sleep: (ms: number) => Promise<void>;
now: () => number;
timeoutMs?: number;
pollIntervalMs?: number;
};
export async function waitForScenarioQuiescence({
baseUrl,
runId,
getStatus,
countContainers,
sleep,
now,
timeoutMs = SCENARIO_CLEANUP_TIMEOUT_MS,
pollIntervalMs = SCENARIO_CLEANUP_POLL_INTERVAL_MS,
}: ScenarioQuiescenceOptions,
): Promise<ScenarioQuiescenceResult> {
const startedAt = now();
let status = await getStatus(baseUrl);
let remaining = countContainers(runId, true);
while (!isScenarioQuiescent(status, remaining)) {
const waitedMs = now() - startedAt;
if (waitedMs >= timeoutMs) break;
await sleep(Math.min(pollIntervalMs, timeoutMs - waitedMs));
status = await getStatus(baseUrl);
remaining = countContainers(runId, true);
}
const waitedMs = Math.min(timeoutMs, Math.max(0, now() - startedAt));
return {
quiescent: isScenarioQuiescent(status, remaining),
waitedMs,
remainingCapacityContainers: remaining,
activeSimulationCount: status.capacity?.simulation?.active ?? null,
queueWaiting: status.capacity?.queue?.waiting ?? null,
admissionCurrent: status.capacity?.admission?.current ?? null,
sandboxStartActive: status.capacity?.sandboxStart?.active ?? null,
sandboxStartWaiting: status.capacity?.sandboxStart?.waiting ?? null,
};
}
export type HostSample = {
atMs: number;
cpuPercent: number | null;
loadAverage: number | null;
availableMemoryBytes: number | null;
swapUsedBytes: number | null;
iowaitPercent: number | null;
runningDockerContainers: number;
capacityDockerContainers: number;
};
export function parseLinuxMemoryInfo(contents: string): { availableMemoryBytes: number | null; swapUsedBytes: number | null } {
const values = new Map<string, number>();
for (const line of contents.split("\n")) {
const match = /^(\w+):\s*(\d+)\s+kB$/.exec(line.trim());
Eif (match) values.set(match[1], Number(match[2]) * 1024);
}
const availableMemoryBytes = values.get("MemAvailable");
const swapTotalBytes = values.get("SwapTotal");
const swapFreeBytes = values.get("SwapFree");
return {
availableMemoryBytes: availableMemoryBytes !== undefined && Number.isSafeInteger(availableMemoryBytes)
? availableMemoryBytes
: null,
swapUsedBytes: swapTotalBytes !== undefined && swapFreeBytes !== undefined
&& Number.isSafeInteger(swapTotalBytes) && Number.isSafeInteger(swapFreeBytes)
? Math.max(0, swapTotalBytes - swapFreeBytes)
: null,
};
}
export type CleanupResult = {
backendExited: boolean;
remainingCapacityContainers: number;
activeSimulationCount: number | null;
queueWaiting: number | null;
admissionCurrent: number | null;
sandboxStartActive: number | null;
sandboxStartWaiting: number | null;
/** True only after all capacity counters and owned containers reached zero. */
quiescent?: boolean;
/** Wall-clock time spent waiting for asynchronous cleanup to quiesce. */
quiescenceWaitMs?: number;
};
export type ScenarioRunnerDependencies = {
now?: () => number;
sleep?: (ms: number) => Promise<void>;
getStatus?: (baseUrl: string) => Promise<StatusSnapshot>;
createSessionCookie?: (baseUrl: string) => Promise<string>;
dockerContainerCount?: (runId: string, includeStopped?: boolean) => number;
sampleHost?: () => Promise<HostSample>;
};
export type CapacityScenarioMeasurement = {
scenario: ScenarioKind;
holdDurationMs: number;
arrivalWindowMs: number;
/** Final driver-only safety deadline; never a production timeout. */
clientWatchdogMs?: number;
clients: ClientResult[];
statusHistory: StatusSnapshot[];
runtimeConfiguration: EffectiveCapacityConfiguration;
lifecycleDockerPeak: number;
pollingDockerPeak: number;
activePeak: number;
queuePeak: number;
admissionPeak: number;
sandboxStartPeak: number;
sandboxStartWaitingPeak: number;
startupSlotWaitMs: number[];
/** Copy of the test-only backend samples used for startupSlotWaitMs. */
authoritativeSandboxStartWaitSamplesMs?: number[];
authoritativeSandboxStartWaitSamplesComplete?: boolean;
startupDurationMs: number[];
queueWaitMs: number[];
hostSamples: HostSample[];
restCompiles?: RestCompileBatchMeasurement;
errors: string[];
cleanup: CleanupResult;
};
type ScenarioSummaryInput = Omit<CapacityScenarioMeasurement,
"activePeak" | "queuePeak" | "admissionPeak" | "sandboxStartPeak" |
"sandboxStartWaitingPeak" | "startupSlotWaitMs" | "startupDurationMs" | "queueWaitMs" | "clientWatchdogMs"> & {
clientWatchdogMs?: number;
};
export function summarizeCapacityScenario(input: ScenarioSummaryInput): CapacityScenarioMeasurement {
const activePeak = Math.max(
...input.statusHistory.map((status) => status.capacity?.simulation?.active ?? 0),
0,
);
const queuePeak = Math.max(
...input.statusHistory.map((status) => status.capacity?.queue?.waiting ?? 0),
0,
);
const admissionPeak = Math.max(
...input.statusHistory.map((status) => status.capacity?.admission?.current ?? 0),
0,
);
const sandboxStartPeak = Math.max(
...input.statusHistory.map((status) => status.capacity?.sandboxStart?.active ?? 0),
0,
);
const sandboxStartWaitingPeak = Math.max(
...input.statusHistory.map((status) => status.capacity?.sandboxStart?.waiting ?? 0),
0,
);
const authoritativeSamples = input.statusHistory
.map((status) => status.capacityTest?.sandboxStartWaitSamplesMs ?? [])
.reduce((longest, samples) => samples.length >= longest.length ? samples : longest, [] as number[]);
const expectedStartupSamples = input.clients.filter((client) => client.started || client.startupBeganAtMs !== null).length;
return {
...input,
activePeak,
queuePeak,
admissionPeak,
sandboxStartPeak,
sandboxStartWaitingPeak,
startupSlotWaitMs: [...authoritativeSamples],
authoritativeSandboxStartWaitSamplesMs: [...authoritativeSamples],
authoritativeSandboxStartWaitSamplesComplete: authoritativeSamples.length === expectedStartupSamples,
startupDurationMs: input.clients.flatMap((client) => client.startupDurationMs === null ? [] : [client.startupDurationMs]),
queueWaitMs: input.clients.flatMap((client) => client.queueWaitMs === null ? [] : [client.queueWaitMs]),
...(input.restCompiles ? { restCompiles: input.restCompiles } : {}),
};
}
export type ClientCapacityTimingMessage = {
type?: string;
status?: string;
arduinoCliStatus?: string;
};
/**
* Record protocol timestamps that belong to the simulation queue/startup path.
* Sandbox-start semaphore waits are deliberately absent here: those values
* come only from the backend's test-only capacityTest samples.
*/
export function applyClientCapacityTiming(
result: ClientResult,
message: ClientCapacityTimingMessage,
at: number,
): void {
if (message.type === "simulation_status" && message.status === "queued") {
result.queueEnteredAtMs ??= at;
}
if (message.type === "compilation_status") {
result.simulationSlotAcquiredAtMs ??= at;
result.startupBeganAtMs ??= at;
Eif (result.queueEnteredAtMs !== null) {
result.queueWaitMs ??= at - result.queueEnteredAtMs;
}
Iif (message.arduinoCliStatus === "error") {
result.errors.push("sandbox compilation failed");
}
}
Iif (message.type === "simulation_status" && message.status === "running" && !result.started) {
result.runtimeStartedAtMs = at;
result.started = true;
result.startLatencyMs = at - result.requestedAtMs;
if (result.queueWaitMs === null && result.queueEnteredAtMs !== null && result.simulationSlotAcquiredAtMs !== null) {
result.queueWaitMs = result.simulationSlotAcquiredAtMs - result.queueEnteredAtMs;
}
result.queueWaitMs ??= 0;
if (result.startupBeganAtMs !== null) result.startupDurationMs = at - result.startupBeganAtMs;
}
}
function getJson<T>(url: string): Promise<{ statusCode: number; body: T; headers: http.IncomingHttpHeaders }> {
return new Promise((resolve, reject) => {
const target = new URL(url);
const request = http.get(
{
hostname: target.hostname,
port: target.port,
path: `${target.pathname}${target.search}`,
},
(response) => {
let body = "";
response.setEncoding("utf8");
response.on("data", (chunk: string) => { body += chunk; });
response.on("end", () => {
try {
resolve({
statusCode: response.statusCode ?? 0,
body: JSON.parse(body) as T,
headers: response.headers,
});
} catch (error) {
reject(error);
}
});
},
);
request.on("error", reject);
});
}
function sketch(clientId: number): string {
return `void setup() { Serial.begin(9600); Serial.println("CLIENT_${clientId}_START"); }\nvoid loop() { Serial.println("CLIENT_${clientId}_TICK"); delay(100); }`;
}
function defaultDockerContainerCount(runId: string, includeStopped = false): number {
const statusArgs = includeStopped ? [] : ["--filter", "status=running"];
const output = execFileSync("docker", [
"ps",
...(includeStopped ? ["-a"] : []),
...statusArgs,
"--filter", `label=unosim.capacity-test-run-id=${runId}`,
"--format", "{{.ID}}",
], { encoding: "utf8" });
return output.trim().split("\n").filter(Boolean).length;
}
function defaultStatus(baseUrl: string): Promise<StatusSnapshot> {
return getJson<StatusSnapshot>(`${baseUrl}/api/status`).then((response) => {
if (response.statusCode !== 200) throw new Error(`GET /api/status returned HTTP ${response.statusCode}`);
return response.body;
});
}
async function defaultSessionCookie(baseUrl: string): Promise<string> {
const response = await getJson<StatusSnapshot>(`${baseUrl}/api/status`);
if (response.statusCode !== 200) throw new Error(`Could not establish local test session (HTTP ${response.statusCode})`);
const setCookie = response.headers["set-cookie"];
const cookieHeader = Array.isArray(setCookie) ? setCookie[0] : setCookie;
const cookie = cookieHeader?.split(";", 1)[0];
if (!cookie) throw new Error("Status endpoint did not issue a local session cookie");
return cookie;
}
type DockerEventTracker = { readonly peak: number; stop: () => Promise<void> };
function startDockerEventTracker(runId: string): DockerEventTracker {
const child = spawn(
"docker",
["events", "--format", "{{json .}}", "--filter", `label=unosim.capacity-test-run-id=${runId}`],
{ stdio: ["ignore", "pipe", "ignore"] },
);
if (!child.stdout) throw new Error("Docker events did not provide stdout");
const tracker = createDockerLifecycleTracker(runId);
let buffer = "";
child.stdout.on("data", (chunk: Buffer | string) => {
buffer += chunk.toString();
const lines = buffer.split("\n");
buffer = lines.pop() ?? "";
for (const line of lines) tracker.consume(line);
});
return {
get peak() { return tracker.peak; },
stop: () => new Promise<void>((resolve) => {
if (child.exitCode !== null) { resolve(); return; }
const timer = setTimeout(() => { child.kill("SIGTERM"); resolve(); }, 1_000);
child.once("close", () => { clearTimeout(timer); resolve(); });
child.kill("SIGTERM");
}),
};
}
function emptyClient(clientId: number, now: number): ClientResult {
return {
clientId,
connected: false,
started: false,
requestedAtMs: now,
connectedAtMs: null,
admittedAtMs: null,
queueEnteredAtMs: null,
simulationSlotAcquiredAtMs: null,
startupSlotWaitBeganAtMs: null,
startupSlotAcquiredAtMs: null,
startupBeganAtMs: null,
runtimeStartedAtMs: null,
completedAtMs: null,
terminalAtMs: null,
disconnectedAtMs: null,
startLatencyMs: null,
queueWaitMs: null,
startupSlotWaitMs: null,
startupDurationMs: null,
runtimeDurationMs: null,
operationErrorCodes: [],
errors: [],
outcome: "incomplete",
};
}
function websocketPayloadText(raw: WebSocket.RawData): string {
if (Array.isArray(raw)) return Buffer.concat(raw).toString("utf8");
if (raw instanceof ArrayBuffer) return Buffer.from(raw).toString("utf8");
return raw.toString("utf8");
}
function scheduleSimulationStop(ws: WebSocket | null, holdDurationMs: number): NodeJS.Timeout {
return setTimeout(() => {
if (ws?.readyState === WebSocket.OPEN) ws.send(JSON.stringify({ type: "stop_simulation" }));
}, holdDurationMs);
}
function runClient(
baseUrl: string,
clientId: number,
holdDurationMs: number,
timeoutSec: number,
clientWatchdogMs: number,
now: () => number,
createSessionCookie: (baseUrl: string) => Promise<string>,
): Promise<ClientResult> {
return new Promise((resolve) => {
const requestedAt = now();
const result = emptyClient(clientId, requestedAt);
let ws: WebSocket | null = null;
let finished = false;
let holdTimer: NodeJS.Timeout | null = null;
const timeoutMs = clientWatchdogMs;
const timeoutTimer = setTimeout(() => {
recordClientWatchdogExpiry(result, timeoutMs);
finish();
}, timeoutMs);
const finish = () => {
if (finished) return;
finished = true;
clearTimeout(timeoutTimer);
if (holdTimer) clearTimeout(holdTimer);
if (ws?.readyState === WebSocket.OPEN) ws.close();
result.terminalAtMs ??= now();
result.disconnectedAtMs ??= now();
result.outcome = classifyClientOutcome(result);
resolve(result);
};
createSessionCookie(baseUrl).then((cookie) => {
if (finished) return;
ws = new WebSocket(`${baseUrl.replace(/^http/, "ws")}/ws`, { headers: { cookie } });
ws.on("open", () => {
result.connected = true;
result.connectedAtMs ??= now();
ws?.send(JSON.stringify({ type: "start_simulation", code: sketch(clientId), timeout: timeoutSec }));
});
ws.on("message", (raw) => {
try {
const message = JSON.parse(websocketPayloadText(raw)) as ClientCapacityTimingMessage & { code?: string };
const at = now();
const wasStarted = result.started;
applyClientCapacityTiming(result, message, at);
if (!wasStarted && result.started) {
holdTimer = scheduleSimulationStop(ws, holdDurationMs);
}
if (message.type === "operation_error") {
result.operationErrorCodes.push(message.code ?? "unknown");
if (message.code !== "SYSTEM_BUSY") result.errors.push(message.code ?? "unknown operation error");
}
if (
message.type === "simulation_status" &&
message.status === "stopped" &&
(result.started || result.operationErrorCodes.length > 0 || result.startupBeganAtMs !== null)
) {
result.terminalAtMs ??= at;
if (result.started && result.runtimeStartedAtMs !== null && result.operationErrorCodes.length === 0 && result.errors.length === 0) {
result.completedAtMs ??= at;
result.runtimeDurationMs = at - result.runtimeStartedAtMs;
}
setTimeout(finish, 50);
}
} catch (error) {
result.errors.push(error instanceof Error ? error.message : String(error));
}
});
ws.on("close", () => {
result.terminalAtMs ??= now();
if (result.completedAtMs === null && result.operationErrorCodes.length === 0 && result.errors.length === 0) {
result.errors.push("WebSocket closed before completion");
}
finish();
});
ws.on("error", (error) => {
result.errors.push(error.message);
finish();
});
}).catch((error: unknown) => {
result.errors.push(error instanceof Error ? error.message : String(error));
finish();
});
});
}
function runtimeConfiguration(status: StatusSnapshot): EffectiveCapacityConfiguration {
return {
simulationMaxConcurrent: status.capacity?.simulation?.maxConcurrent ?? 0,
sandboxStartMaxConcurrent: status.capacity?.sandboxStart?.maxConcurrent ?? 0,
simulationAdmissionMax: status.capacity?.admission?.max ?? 0,
simulationQueueTimeoutMs: status.capacity?.queue?.timeoutMs ?? 0,
sandboxStartSlotTimeoutMs: status.capacity?.sandboxStart?.slotTimeoutMs ?? 0,
dockerControlTimeoutMs: 0,
compileMaxConcurrent: status.capacity?.compile?.maxConcurrent ?? 0,
};
}
export function validateScenarioRuntimeConfiguration(
options: Pick<CapacityScenarioOptions, "expectedSimulationMaxConcurrent" | "expectedSandboxStartMaxConcurrent" | "requiredAdmissionMax" | "expectedSimulationQueueTimeoutMs">,
actual: EffectiveCapacityConfiguration,
): void {
const requirements = {
simulationMaxConcurrent: options.expectedSimulationMaxConcurrent,
sandboxStartMaxConcurrent: options.expectedSandboxStartMaxConcurrent,
admissionMax: options.requiredAdmissionMax,
simulationQueueTimeoutMs: options.expectedSimulationQueueTimeoutMs,
};
const hasMismatch = (
(requirements.simulationMaxConcurrent !== undefined
&& actual.simulationMaxConcurrent !== requirements.simulationMaxConcurrent)
|| (requirements.sandboxStartMaxConcurrent !== undefined
&& actual.sandboxStartMaxConcurrent !== requirements.sandboxStartMaxConcurrent)
|| (requirements.admissionMax !== undefined && actual.simulationAdmissionMax < requirements.admissionMax)
|| (requirements.simulationQueueTimeoutMs !== undefined
&& actual.simulationQueueTimeoutMs !== requirements.simulationQueueTimeoutMs)
);
if (hasMismatch) throw new CapacityScenarioConfigurationError(requirements, actual);
}
function createDefaultHostSampler(): () => Promise<HostSample> {
let previousLinuxCounters: { total: number; idle: number; iowait: number } | null = null;
return async () => {
let cpuPercent: number | null = null;
let iowaitPercent: number | null = null;
let availableMemoryBytes: number | null = os.freemem();
let swapUsedBytes: number | null = null;
if (process.platform === "darwin") {
try {
const { stdout } = await execFileAsync("ps", ["-A", "-o", "%cpu="], { encoding: "utf8" });
const sum = stdout.split("\n").map((value) => Number(value.trim())).filter(Number.isFinite).reduce((total, value) => total + value, 0);
cpuPercent = Math.min(100, sum / Math.max(1, os.cpus().length));
} catch {
cpuPercent = null;
}
} else {
try {
const stat = await fs.promises.readFile("/proc/stat", "utf8");
const fields = stat.split("\n").find((line) => line.startsWith("cpu "))?.trim().split(/\s+/).slice(1).map(Number) ?? [];
const [user = 0, nice = 0, system = 0, idle = 0, iowait = 0, irq = 0, softirq = 0, steal = 0] = fields;
const total = user + nice + system + idle + iowait + irq + softirq + steal;
const idleAll = idle + iowait;
if (previousLinuxCounters) {
const totalDelta = total - previousLinuxCounters.total;
const idleDelta = idleAll - previousLinuxCounters.idle;
const iowaitDelta = iowait - previousLinuxCounters.iowait;
if (totalDelta > 0) {
cpuPercent = Math.max(0, Math.min(100, (totalDelta - idleDelta) / totalDelta * 100));
iowaitPercent = Math.max(0, Math.min(100, iowaitDelta / totalDelta * 100));
}
}
previousLinuxCounters = { total, idle: idleAll, iowait };
} catch {
cpuPercent = null;
}
try {
const memory = parseLinuxMemoryInfo(await fs.promises.readFile("/proc/meminfo", "utf8"));
if (memory.availableMemoryBytes !== null) availableMemoryBytes = memory.availableMemoryBytes;
swapUsedBytes = memory.swapUsedBytes;
} catch {
availableMemoryBytes = null;
swapUsedBytes = null;
}
}
return {
atMs: Date.now(),
cpuPercent,
loadAverage: os.loadavg()[0] ?? null,
availableMemoryBytes,
swapUsedBytes,
iowaitPercent,
runningDockerContainers: 0,
capacityDockerContainers: 0,
};
};
}
async function runScenarioClients(
options: CapacityScenarioOptions,
sleep: (ms: number) => Promise<void>,
clientWatchdogMs: number,
now: () => number,
createSessionCookie: (baseUrl: string) => Promise<string>,
): Promise<ClientResult[]> {
const arrivalWindowMs = options.scenario === "classroom" ? options.arrivalWindowMs ?? 0 : 0;
const offsets = arrivalOffsetsMs(options.clientCount, arrivalWindowMs);
return Promise.all(offsets.map((offsetMs, index) => (async () => {
if (offsetMs > 0) await sleep(offsetMs);
return runClient(options.baseUrl, index + 1, options.holdDurationMs, options.simulationTimeoutSec, clientWatchdogMs, now, createSessionCookie);
})()));
}
/**
* Start offsets that spread classroom arrivals evenly over the window: the first
* client starts at 0, the last at the end of the window. A burst uses window 0.
*/
export function arrivalOffsetsMs(clientCount: number, arrivalWindowMs: number): number[] {
const intervalMs = clientCount > 1 ? arrivalWindowMs / (clientCount - 1) : 0;
return Array.from({ length: clientCount }, (_, index) => index * intervalMs);
}
async function resolveScenarioCleanup(
options: CapacityScenarioOptions,
initialStatus: StatusSnapshot,
getStatus: (baseUrl: string) => Promise<StatusSnapshot>,
countContainers: (runId: string, includeStopped?: boolean) => number,
sleep: (ms: number) => Promise<void>,
now: () => number,
errors: string[],
): Promise<{ quiescence: ScenarioQuiescenceResult; finalStatus: StatusSnapshot }> {
let quiescence: ScenarioQuiescenceResult;
try {
quiescence = await waitForScenarioQuiescence({ baseUrl: options.baseUrl, runId: options.runId, getStatus, countContainers, sleep, now });
} catch (error) {
errors.push(error instanceof Error ? error.message : String(error));
const failedStatus = await getStatus(options.baseUrl).catch(() => initialStatus);
quiescence = {
quiescent: false,
waitedMs: 0,
remainingCapacityContainers: countContainers(options.runId, true),
activeSimulationCount: failedStatus.capacity?.simulation?.active ?? null,
queueWaiting: failedStatus.capacity?.queue?.waiting ?? null,
admissionCurrent: failedStatus.capacity?.admission?.current ?? null,
sandboxStartActive: failedStatus.capacity?.sandboxStart?.active ?? null,
sandboxStartWaiting: failedStatus.capacity?.sandboxStart?.waiting ?? null,
};
}
const finalStatus = await getStatus(options.baseUrl).catch(() => initialStatus);
return { quiescence, finalStatus };
}
export async function runCapacityScenario(
options: CapacityScenarioOptions,
dependencies: ScenarioRunnerDependencies = {},
): Promise<CapacityScenarioMeasurement> {
validateCapacityScenarioOptions(options);
const now = dependencies.now ?? Date.now;
const sleep = dependencies.sleep ?? ((ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms)));
const getStatus = dependencies.getStatus ?? defaultStatus;
const createSessionCookie = dependencies.createSessionCookie ?? defaultSessionCookie;
const countContainers = dependencies.dockerContainerCount ?? defaultDockerContainerCount;
const sampleHost = dependencies.sampleHost ?? createDefaultHostSampler();
const initialStatus = { ...await getStatus(options.baseUrl), sampledAtMs: now() };
const initialRuntimeConfiguration = runtimeConfiguration(initialStatus);
validateScenarioRuntimeConfiguration(options, initialRuntimeConfiguration);
const clientWatchdogMs = deriveClientWatchdogMs(
options.simulationTimeoutSec,
initialRuntimeConfiguration.simulationQueueTimeoutMs,
initialRuntimeConfiguration.sandboxStartSlotTimeoutMs,
options.holdDurationMs,
);
const statusHistory: StatusSnapshot[] = [initialStatus];
const hostSamples: HostSample[] = [];
const errors: string[] = [];
const eventTracker = startDockerEventTracker(options.runId);
let pollingPeak = countContainers(options.runId);
let pollInFlight = false;
const statusPoller = setInterval(() => {
getStatus(options.baseUrl).then((status) => statusHistory.push({ ...status, sampledAtMs: now() })).catch((error: unknown) => {
errors.push(error instanceof Error ? error.message : String(error));
});
}, 250);
const hostPoller = setInterval(() => {
sampleHost().then((sample) => {
let enriched = sample;
try {
enriched = { ...sample, capacityDockerContainers: countContainers(options.runId) };
pollingPeak = Math.max(pollingPeak, enriched.capacityDockerContainers);
} catch (error) {
errors.push(error instanceof Error ? error.message : String(error));
}
hostSamples.push(enriched);
}).catch((error: unknown) => {
errors.push(error instanceof Error ? error.message : String(error));
});
}, 1_000);
const dockerPoller = setInterval(() => {
if (pollInFlight) return;
pollInFlight = true;
try { pollingPeak = Math.max(pollingPeak, countContainers(options.runId)); }
catch (error) { errors.push(error instanceof Error ? error.message : String(error)); }
finally { pollInFlight = false; }
}, 250);
try {
const arrivalWindowMs = options.scenario === "classroom" ? options.arrivalWindowMs ?? 0 : 0;
const [clients, restCompiles] = await Promise.all([
runScenarioClients(options, sleep, clientWatchdogMs, now, createSessionCookie),
options.restCompileCount && options.restCompileCount > 0
? runRestCompileBatch({
baseUrl: options.baseUrl,
runId: options.runId,
requestCount: options.restCompileCount,
concurrency: options.restCompileConcurrency ?? Math.min(options.restCompileCount, 8),
timeoutMs: options.restCompileTimeoutMs,
})
: Promise.resolve(undefined),
]);
await eventTracker.stop();
clearInterval(statusPoller);
clearInterval(dockerPoller);
if (hostPoller) clearInterval(hostPoller);
const { quiescence, finalStatus } = await resolveScenarioCleanup(options, initialStatus, getStatus, countContainers, sleep, now, errors);
statusHistory.push({ ...finalStatus, sampledAtMs: now() });
pollingPeak = Math.max(pollingPeak, countContainers(options.runId));
const cleanup: CleanupResult = {
backendExited: false,
remainingCapacityContainers: quiescence.remainingCapacityContainers,
activeSimulationCount: quiescence.activeSimulationCount,
queueWaiting: quiescence.queueWaiting,
admissionCurrent: quiescence.admissionCurrent,
sandboxStartActive: quiescence.sandboxStartActive,
sandboxStartWaiting: quiescence.sandboxStartWaiting,
quiescent: quiescence.quiescent,
quiescenceWaitMs: quiescence.waitedMs,
};
if (!cleanup.quiescent) errors.push("scenario cleanup did not reach quiescence before deadline");
if (cleanup.remainingCapacityContainers > 0) errors.push("capacity containers remain after scenario");
const measurement = summarizeCapacityScenario({
scenario: options.scenario,
holdDurationMs: options.holdDurationMs,
arrivalWindowMs,
clientWatchdogMs,
clients,
statusHistory,
runtimeConfiguration: runtimeConfiguration(initialStatus),
lifecycleDockerPeak: eventTracker.peak,
pollingDockerPeak: pollingPeak,
hostSamples,
...(restCompiles ? { restCompiles } : {}),
errors,
cleanup,
});
if (options.outputDir) {
fs.mkdirSync(options.outputDir, { recursive: true });
fs.writeFileSync(path.join(options.outputDir, `scenario-${options.scenario}-${options.clientCount}.json`), JSON.stringify(measurement, null, 2));
}
return measurement;
} catch (error) {
clearInterval(statusPoller);
clearInterval(dockerPoller);
if (hostPoller) clearInterval(hostPoller);
await eventTracker.stop();
throw error;
}
}
function validateCapacityScenarioOptions(options: CapacityScenarioOptions): void {
if (!options.baseUrl || !options.runId) throw new Error("Owned backend URL and run ID are required");
if (!Number.isInteger(options.clientCount) || options.clientCount < 1) throw new Error("clientCount must be positive");
if (!Number.isInteger(options.holdDurationMs) || options.holdDurationMs < 1) throw new Error("holdDurationMs must be positive");
if (!Number.isInteger(options.simulationTimeoutSec) || options.simulationTimeoutSec < 1 || options.simulationTimeoutSec > 300) {
throw new Error("simulationTimeoutSec must be between 1 and 300 seconds");
}
if (options.restCompileCount !== undefined
&& (!Number.isInteger(options.restCompileCount) || options.restCompileCount < 0 || options.restCompileCount > 128)) {
throw new Error("restCompileCount must be between 0 and 128");
}
if (options.scenario === "classroom" && (!Number.isInteger(options.arrivalWindowMs) || (options.arrivalWindowMs ?? 0) < 0)) {
throw new Error("classroom scenarios require a non-negative integer arrivalWindowMs");
}
}
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