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// Orchestrates the complete simulation lifecycle (prepare, compile, run)
// Extracted from SandboxRunner to reduce runner complexity
import { randomUUID } from "node:crypto";
import { Logger } from "@shared/logger";
import type { IOPinRecord } from "@shared/schema";
import type { PinStateChange } from "@shared/types/arduino.types";
import type { IProcessController } from "../process-controller";
import { ArduinoOutputParser as StderrParser } from "../arduino-output-parser";
import { RegistryManager } from "../registry-manager";
import { SimulationTimeoutManager } from "../simulation-timeout-manager";
import { SketchFileBuilder } from "../sketch-file-builder";
import { LocalCompiler } from "../local-compiler";
import { PinStateBatcher, type PinStateBatch } from "../pin-state-batcher";
import { SerialOutputBatcher } from "../serial-output-batcher";
import type { RunSketchOptions } from "../run-sketch-types";
import { getDockerCompileSemaphore } from "./docker-compile-semaphore";
import { DockerManager } from "./docker-manager";
import { StreamHandler } from "./stream-handler";
import { FilesystemHelper } from "./filesystem-helper";
import { config } from "../../config";
import { normalizeBaudrate, normalizeSimulationTimeout } from "@shared/input-limits";
import { canTransition } from "../simulation-state-machine";
import { createProcessExecutionPort, type ProcessExecution } from "../process-execution-port";
import { OutputCollector } from "../output-collector";
import { flushMessageQueue, flushBatchers, cleanupDockerContainer } from "./execution-phases/cleanup-phase";
import { scheduleExecutionTimeout } from "./execution-phases/timeout-phase";
import { createStreamCallbacks, delegateParsedLineToStreamHandler, handleStderrFallbackData } from "./execution-phases/stream-phase";
import { runLocalStart, runDockerStart, type LocalStartContext, type DockerStartContext, type DockerStartParams, type TransitionToFn } from "./execution-phases/start-phase";
import { decideExecutionRoute } from "./execution-phases/router-phase";
import { performCompilation, type PrepareContext } from "./execution-phases/prepare-phase";
import { compileMetricsTracker } from "../server-metrics";
export enum SimulationState {
STOPPED = "stopped",
STARTING = "starting",
RUNNING = "running",
PAUSED = "paused",
ERROR = "error",
}
export const SANDBOX_CONFIG = {
dockerImage: config.sandbox.dockerImage,
useDocker: config.simulationMode === "docker-sandbox",
maxMemoryMB: config.sandbox.resources.memoryMB,
cpuLimit: config.sandbox.resources.cpuLimit,
maxCpuPercent: Math.round(Number.parseFloat(config.sandbox.resources.cpuLimit) * 100),
pidsLimit: config.sandbox.resources.pidsLimit,
maxExecutionTimeSec: config.sandbox.resources.maxExecutionTimeSec,
maxOutputBytes: config.sandbox.resources.maxOutputBytes,
noNetwork: true,
readOnlyFs: true,
dropCapabilities: true,
};
// Type aliases for callbacks
// Output / error / pin state callbacks (from sandbox runner to consumers)
type OutputCallback = (line: string, isComplete?: boolean) => void;
type PinStateCallback = (pin: number, type: PinStateChange, value: number) => void;
type ErrorCallback = (line: string) => void;
export interface TelemetryMetrics {
timestamp: number;
intendedPinChangesPerSecond: number;
actualPinChangesPerSecond: number;
droppedPinChangesPerSecond: number;
batchesPerSecond: number;
avgStatesPerBatch: number;
serialOutputPerSecond: number;
serialBytesPerSecond: number;
serialBytesTotal: number;
serialIntendedBytesPerSecond: number;
serialDroppedBytesPerSecond: number;
}
type TelemetryCallback = (metrics: TelemetryMetrics) => void;
type ProcessMessage =
| { type: "pinState"; data: { pin: number; stateType: PinStateChange; value: number } }
| { type: "output"; data: { line: string; isComplete?: boolean } }
| { type: "error"; data: { line: string } };
type DockerState = {
isCompilePhase: { value: boolean };
compileErrorBuffer: { value: string };
compileSuccessSent: { value: boolean };
totalOutputBytes: { value: number };
processStartTime: number | null;
stderrFallbackBuffer: string;
flushTimer: NodeJS.Timeout | null;
};
interface ExecutionCallbacks {
onOutput: OutputCallback;
onError: ErrorCallback;
onPinState?: PinStateCallback;
}
type IORegistryCallback = (registry: IOPinRecord[], baudrate: number | undefined, reason?: string) => void;
// Nullable type aliases
type Nullable<T> = T | null;
export interface ExecutionState {
outputBuffer: string;
outputBufferIndex: number;
isSendingOutput: boolean;
totalOutputBytes: number;
messageQueue: ProcessMessage[];
pauseStartTime: Nullable<number>;
totalPausedTime: number;
isCompiling: boolean;
currentSketchDir: Nullable<string>;
currentRegistryFile: Nullable<string>;
processStartTime: Nullable<number>;
onOutputCallback: Nullable<OutputCallback>;
pinStateCallback: Nullable<PinStateCallback>;
errorCallback: Nullable<ErrorCallback>;
telemetryCallback: Nullable<TelemetryCallback>;
ioRegistryCallback?: IORegistryCallback;
pinStateBatcher: Nullable<PinStateBatcher>;
serialOutputBatcher: Nullable<SerialOutputBatcher>;
backpressurePaused: boolean;
baudrate: number;
stderrFallbackBuffer: string;
flushTimer: Nullable<NodeJS.Timeout>;
state: SimulationState;
processKilled: boolean;
pendingCleanup: boolean;
processController: IProcessController;
currentContainerName?: string;
dockerAvailable?: boolean;
dockerImageBuilt?: boolean;
outputCollector?: OutputCollector;
}
export class ExecutionManager {
private readonly logger = new Logger("ExecutionManager");
private readonly stderrParser = new StderrParser();
private readonly registryManager: RegistryManager;
private readonly timeoutManager: SimulationTimeoutManager;
private readonly fileBuilder: SketchFileBuilder;
private readonly localCompiler: LocalCompiler;
private readonly dockerManager: DockerManager;
private readonly streamHandler: StreamHandler;
private readonly filesystemHelper: FilesystemHelper;
private readonly processExecutor: ProcessExecution;
constructor(
registryManager: RegistryManager,
timeoutManager: SimulationTimeoutManager,
fileBuilder: SketchFileBuilder,
localCompiler: LocalCompiler,
dockerManager: DockerManager,
streamHandler: StreamHandler,
filesystemHelper: FilesystemHelper,
) {
this.registryManager = registryManager;
this.timeoutManager = timeoutManager;
this.fileBuilder = fileBuilder;
this.localCompiler = localCompiler;
this.dockerManager = dockerManager;
this.streamHandler = streamHandler;
this.filesystemHelper = filesystemHelper;
this.processExecutor = createProcessExecutionPort();
}
/**
* Main execution entry point: orchestrates prepare → start → stream → timeout → cleanup
*/
async runSketch(options: RunSketchOptions, state: ExecutionState): Promise<void> {
const { code, onOutput, onError, onExit, onCompileError, onPinState, timeoutSec, onIORegistry, onTelemetry, onPinStateBatch } = options;
// Transition to STARTING state
const canStart = this.transitionTo(state, SimulationState.STARTING);
Iif (!canStart) {
this.logger.warn(`runSketch ignored - invalid state: ${state.state}`);
return;
}
// Clear pending cleanup for a fresh run
state.pendingCleanup = false;
// Create and start PinStateBatcher
state.pinStateBatcher = new PinStateBatcher({
tickIntervalMs: config.timeouts.batcherTickIntervalMs,
onBatch: (batch: PinStateBatch) => {
if (state.messageQueue && this.registryManager.isWaiting()) {
for (const s of batch.states) {
state.messageQueue.push({
type: "pinState",
data: { pin: s.pin, stateType: s.stateType, value: s.value },
});
}
} else if (onPinStateBatch) {
onPinStateBatch(batch);
} else if (onPinState) {
for (const s of batch.states) {
onPinState(s.pin, s.stateType, s.value);
}
}
},
});
state.pinStateBatcher.start();
this.registryManager.setPinStateBatcher(state.pinStateBatcher);
// Bind callbacks
state.onOutputCallback = onOutput;
state.errorCallback = onError;
state.pinStateCallback = onPinState || null;
state.telemetryCallback = onTelemetry || null;
// Initialize run state
this.initializeRunState(code, onOutput, onIORegistry, timeoutSec, state);
// Create and start SerialOutputBatcher
state.serialOutputBatcher = new SerialOutputBatcher({
baudrate: state.baudrate,
tickIntervalMs: config.timeouts.batcherTickIntervalMs,
onChunk: (data: string, firstLineIncomplete?: boolean) => {
Iif (typeof onOutput !== "function") return;
Iif (state.backpressurePaused) {
setTimeout(() => {
if (
state.backpressurePaused &&
state.serialOutputBatcher &&
!state.serialOutputBatcher.isOverloaded() &&
state.state !== SimulationState.PAUSED &&
state.processController.hasProcess()
) {
this.logger.info("Backpressure relieved, sending SIGCONT");
state.processController.kill("SIGCONT");
state.backpressurePaused = false;
}
}, 0);
}
const endsWithNewline = data.endsWith("\n");
const parts = data.split("\n");
for (let i = 0; i < parts.length; i++) {
const isLastPart = i === parts.length - 1;
Iif (isLastPart && endsWithNewline) {
break;
}
const isComplete = !isLastPart && !(i === 0 && firstLineIncomplete);
onOutput(parts[i], isComplete);
}
},
});
state.serialOutputBatcher.start();
this.registryManager.setSerialOutputBatcher(state.serialOutputBatcher);
try {
// Prepare environment
const files = await this.prepareEnvironment(code, state, options.headers);
state.processKilled = false;
Iif (state.pendingCleanup || state.processKilled || state.state === SimulationState.STOPPED) {
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
return;
}
// Create wrapped callbacks
const wrapped = createStreamCallbacks(onOutput, onError, onPinState, state, {
registryManager: this.registryManager,
logger: this.logger,
});
// Setup and run simulation
await this.setupSimulationProcess(files, wrapped, options, state);
} catch (err) {
const errorMessage = err instanceof Error ? err.message : String(err);
this.logger.error(`Kompilierfehler oder Timeout: ${errorMessage}`);
if (onCompileError) {
onCompileError(errorMessage);
}
Eif (onExit) {
onExit(-1);
}
state.processController.destroySockets();
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
}
}
/**
* Initialize run state for a new execution
*/
private initializeRunState(
code: string,
onOutput: (line: string, isComplete?: boolean) => void,
onIORegistry?: (registry: IOPinRecord[], baudrate: number | undefined, reason?: string) => void,
timeoutSec?: number,
state?: ExecutionState,
): void {
Iif (!state) return;
const baudMatch = /Serial\s*\.\s*begin\s*\(\s*(\d+)\s*\)/.exec(code);
state.baudrate = normalizeBaudrate(
baudMatch ? Number.parseInt(baudMatch[1]) : 9600,
);
const executionTimeout = normalizeSimulationTimeout(timeoutSec);
this.logger.info(
`🕐 runSketch called with timeoutSec=${timeoutSec}, using executionTimeout=${executionTimeout}s`,
);
this.logger.info(`Parsed baudrate: ${state.baudrate}`);
state.pauseStartTime = null;
state.totalPausedTime = 0;
this.registryManager.reset();
this.registryManager.setBaudrate(state.baudrate);
this.registryManager.enableWaitMode(config.timeouts.registryWaitModeAfterStartMs);
state.messageQueue = [];
state.outputBuffer = "";
state.outputBufferIndex = 0;
state.isSendingOutput = false;
state.totalOutputBytes = 0;
state.outputCollector = new OutputCollector(SANDBOX_CONFIG.maxOutputBytes);
state.onOutputCallback = onOutput;
state.ioRegistryCallback = onIORegistry;
}
/**
* Prepare environment: write sketch files
*/
private async prepareEnvironment(
code: string,
state: ExecutionState,
headers: Array<{ name: string; content: string }> = [],
): Promise<{ sketchDir: string; sketchFile: string; exeFile: string }> {
const sketchId = randomUUID();
const files = await this.fileBuilder.build(code, sketchId, headers);
state.currentSketchDir = files.sketchDir;
return files;
}
/**
* Perform compilation (local path only; Docker handles internally)
*/
private async performCompilation(
sketchFile: string,
exeFile: string,
opts: RunSketchOptions,
state: ExecutionState,
): Promise<void> {
// Delegate to extracted prepare-phase function
const prepareContext: PrepareContext = {
localCompiler: this.localCompiler,
logger: this.logger,
transitionTo: this.transitionTo.bind(this) as (state: ExecutionState, newState: SimulationState) => boolean,
};
await performCompilation(sketchFile, exeFile, opts, state, prepareContext);
}
/**
* Setup simulation process: compile and spawn
*/
private async setupSimulationProcess(
files: { sketchDir: string; sketchFile: string; exeFile: string },
callbacks: ExecutionCallbacks,
opts: RunSketchOptions,
state: ExecutionState,
): Promise<void> {
// Router-Phase: Decide between Docker and Local execution
const route = decideExecutionRoute(state);
if (route.useDocker) {
await this.runDocker(files, callbacks, opts, state);
I} else if (route.shouldThrowOnNoDocker) {
throw new Error("Docker sandbox is unavailable; refusing local fallback in production mode");
} else {
await this.runLocal(files, callbacks, opts, state);
}
}
/**
* Run in Docker container
*/
private async runDocker(
files: { sketchDir: string; sketchFile: string; exeFile: string },
callbacks: ExecutionCallbacks,
opts: RunSketchOptions,
state: ExecutionState,
): Promise<void> {
const executionTimeout = normalizeSimulationTimeout(opts.timeoutSec);
const containerName = `unosim-sandbox-${randomUUID()}`;
state.currentContainerName = containerName;
const { onCompileError, onCompileSuccess, onExit } = opts;
// ── Docker compile gating ─────────────────────────────────────────────────
// Limit the number of simultaneous g++ compilations inside Docker containers
// to prevent CPU starvation when many students start simulations at once.
// The slot is released once [[RUNTIME_START]] is detected (compile done) or
// on any error, so the semaphore only covers the compile phase.
const queueStartTime = Date.now();
const releaseSemaphore = await getDockerCompileSemaphore().acquire(() => {
opts.onCompileQueued?.();
}, config.timeouts.compileGatekeeperAcquireMs);
const queueWaitTimeMs = Date.now() - queueStartTime;
// Guard: abort if the simulation was stopped while we were waiting
Iif (state.processKilled || state.pendingCleanup || state.state === SimulationState.STOPPED) {
releaseSemaphore();
return;
}
// Release wrapper – idempotent, called from compile-phase callbacks or onClose
let semaphoreReleased = false;
const releaseOnce = () => {
if (!semaphoreReleased) {
semaphoreReleased = true;
releaseSemaphore();
}
};
// Track compile metrics
const compileStartTime = Date.now();
let compileTimedOut = false;
// Wrap compile callbacks so the semaphore is released as soon as the
// compile phase ends (success or error), freeing the slot for the next waiter.
const wrappedOnCompileSuccess = () => {
compileMetricsTracker.recordCompileComplete(compileStartTime, queueWaitTimeMs, true, compileTimedOut);
releaseOnce();
onCompileSuccess?.();
};
const wrappedOnCompileError = (err: string) => {
compileMetricsTracker.recordCompileComplete(compileStartTime, queueWaitTimeMs, false, compileTimedOut);
releaseOnce();
onCompileError?.(err);
};
try {
// Start-Phase extrahiert: Docker-Command + Spawn + processStartTime + RUNNING-Transition
const dockerStartContext: DockerStartContext = {
processController: state.processController,
transitionTo: this.transitionTo.bind(this) as TransitionToFn,
};
const dockerStartParams: DockerStartParams = {
sketchDir: files.sketchDir,
containerName,
};
await runDockerStart(dockerStartParams, state, dockerStartContext);
this.logger.info("🚀 Docker: Compile + Run in single container");
const dockerState: DockerState = {
isCompilePhase: { value: true },
compileErrorBuffer: { value: "" },
compileSuccessSent: { value: false },
totalOutputBytes: { value: state.totalOutputBytes },
processStartTime: state.processStartTime,
stderrFallbackBuffer: state.stderrFallbackBuffer,
flushTimer: state.flushTimer,
};
const dockerCallbacks = {
onOutput: callbacks.onOutput,
onPinState: callbacks.onPinState ?? (() => {}),
onError: callbacks.onError,
};
state.processController.onError((err) => {
this.logger.error(`Docker process error: ${err.message}`);
callbacks.onError(`Docker process failed: ${err.message}`);
});
// Single close handler: state transition + cleanup.
// Note: compile callbacks, batchers, and onExit are handled exclusively
// by dockerManager.setupDockerHandlers → handleDockerExit to avoid
// double invocation (which previously caused a double "stopped" event).
// releaseOnce() here is a safety net for edge cases where the container
// dies before emitting any compile output.
state.processController.onClose((_code) => {
releaseOnce();
this.transitionTo(state, SimulationState.STOPPED);
Iif (state.flushTimer) {
clearTimeout(state.flushTimer);
state.flushTimer = null;
}
void cleanupDockerContainer(state.currentContainerName, {
processExecutor: this.processExecutor,
logger: this.logger,
});
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
});
this.dockerManager.setupDockerHandlers(
dockerCallbacks,
dockerState,
{
flushBatchers: () => flushBatchers(state),
flushMessageQueue: () => flushMessageQueue(state),
getProcessKilled: () => state.processKilled,
executionTimeout,
},
{
onCompileError: wrappedOnCompileError,
onCompileSuccess: wrappedOnCompileSuccess,
onExit,
},
);
} catch (err) {
const isTimeout = err instanceof Error && err.message.includes("timeout");
compileMetricsTracker.recordCompileComplete(compileStartTime, queueWaitTimeMs, false, isTimeout);
releaseOnce();
this.logger.error(`Docker process spawn failed: ${err instanceof Error ? err.message : String(err)}`);
this.transitionTo(state, SimulationState.STOPPED);
state.processController.destroySockets();
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
throw err;
}
}
/**
* Run locally (without Docker)
*/
private async runLocal(
files: { sketchDir: string; sketchFile: string; exeFile: string },
callbacks: ExecutionCallbacks,
opts: RunSketchOptions,
state: ExecutionState,
): Promise<void> {
const executionTimeout = normalizeSimulationTimeout(opts.timeoutSec);
const { onCompileError, onExit } = opts;
// Track compile metrics for local execution (no queue wait)
const queueWaitTimeMs = 0;
const compileStartTime = Date.now();
let compileTimedOut = false;
try {
state.isCompiling = true;
await this.performCompilation(files.sketchFile, files.exeFile, opts, state);
state.isCompiling = false;
// Compile success
compileMetricsTracker.recordCompileComplete(compileStartTime, queueWaitTimeMs, true, compileTimedOut);
if (state.pendingCleanup || state.processKilled || state.state === SimulationState.STOPPED) {
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
return;
}
// Start-Phase extrahiert: Process-Spawn + processStartTime + RUNNING-Transition
const startContext: LocalStartContext = {
processController: state.processController,
transitionTo: this.transitionTo.bind(this) as TransitionToFn,
};
await runLocalStart(files.exeFile, state, startContext);
// Stream-Phase: Event-Handler registrieren
this.setupLocalHandlers(callbacks, onExit, executionTimeout, state);
} catch (err) {
state.isCompiling = false;
const isTimeout = err instanceof Error && err.message.includes("timeout");
compileMetricsTracker.recordCompileComplete(compileStartTime, queueWaitTimeMs, false, isTimeout);
if (onCompileError) onCompileError(err instanceof Error ? err.message : String(err));
Eif (onExit) onExit(-1);
this.transitionTo(state, SimulationState.STOPPED);
state.processController.destroySockets();
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
throw err;
}
}
/**
* Setup event handlers for local process
*/
private setupLocalHandlers(
callbacks: ExecutionCallbacks,
onExit?: (code: number | null) => void,
executionTimeout?: number,
state?: ExecutionState,
): void {
Iif (!state) return;
scheduleExecutionTimeout(this.timeoutManager, executionTimeout, state, callbacks, {
processExecutor: this.processExecutor,
logger: this.logger,
});
state.processController.onStdout((data) => {
const str = data.toString();
const withinLimit = state.outputCollector?.append(str) ?? false;
state.totalOutputBytes = state.outputCollector?.totalBytes ?? state.totalOutputBytes + str.length;
if (!withinLimit) {
state.processController.kill("SIGKILL"); // Trigger stop
callbacks.onError("Output size limit exceeded");
return;
}
const lines = str.split(/\r?\n/);
lines.forEach((line) => {
if (!line) return;
const parsed = this.stderrParser.parseStderrLine(line, state.processStartTime);
delegateParsedLineToStreamHandler(parsed, state, callbacks, {
registryManager: this.registryManager,
streamHandler: this.streamHandler,
});
});
});
const useFallbackParser = !state.processController.supportsStderrLineStreaming();
state.stderrFallbackBuffer = "";
state.processController.onStderr((data) => {
if (useFallbackParser) {
handleStderrFallbackData(data, state, callbacks, {
registryManager: this.registryManager,
streamHandler: this.streamHandler,
stderrParser: this.stderrParser,
});
}
});
state.processController.onStderrLine((line) => {
if (line.length === 0) return;
const parsed = this.stderrParser.parseStderrLine(line, state.processStartTime);
delegateParsedLineToStreamHandler(parsed, state, callbacks, {
registryManager: this.registryManager,
streamHandler: this.streamHandler,
});
});
state.processController.onClose((code) => {
const wasRunning = state.state === SimulationState.RUNNING;
this.transitionTo(state, SimulationState.STOPPED);
Iif (state.flushTimer) {
clearTimeout(state.flushTimer);
state.flushTimer = null;
}
Iif (state.stderrFallbackBuffer) {
const buffered = state.stderrFallbackBuffer;
state.stderrFallbackBuffer = "";
if (buffered.trim()) {
const parsed = this.stderrParser.parseStderrLine(buffered, state.processStartTime);
delegateParsedLineToStreamHandler(parsed, state, callbacks, {
registryManager: this.registryManager,
streamHandler: this.streamHandler,
});
}
}
flushMessageQueue(state);
Eif (wasRunning) {
flushBatchers(state);
Eif (state.serialOutputBatcher) {
state.serialOutputBatcher.destroy();
state.serialOutputBatcher = null;
}
Eif (state.pinStateBatcher) {
state.pinStateBatcher.destroy();
state.pinStateBatcher = null;
}
}
Iif (state.ioRegistryCallback) {
const finalRegistry = this.registryManager.getRegistry();
if (finalRegistry.length > 0) {
state.ioRegistryCallback([...finalRegistry], state.baudrate, "process-exit");
}
}
Eif (!state.processKilled && onExit) onExit(code);
this.filesystemHelper.markTempDirForCleanup(this.extractFilesystemState(state));
});
}
/**
* State transition (delegated from runner)
*/
private transitionTo(state: ExecutionState, newState: SimulationState): boolean {
if (!canTransition(state.state, newState)) return false;
state.state = newState;
return true;
}
/**
* Extract filesystem state for delegation
*/
private extractFilesystemState(state: ExecutionState) {
return {
currentSketchDir: state.currentSketchDir,
isCompiling: state.isCompiling,
pendingCleanup: state.pendingCleanup,
cleanupRetries: new Map(),
currentRegistryFile: null,
};
}
}
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