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* Extracted utility functions from compile-worker.ts
*
* These pure and I/O-only helpers are separated for testability.
* The main compile-worker.ts thread imports them at runtime.
*/
import { createHash } from "node:crypto";
import { mkdir, open, readdir, rm, stat, writeFile } from "node:fs/promises";
import { join } from "node:path";
/**
* Normalize and sort library names for deterministic hashing.
*/
export function normalizeLibraries(libraries?: string[]): string[] {
return (libraries || [])
.map((entry) => entry.trim())
.filter(Boolean)
.sort((a, b) => a.localeCompare(b));
}
/**
* Compute a SHA-256 hash of code + FQBN for sketch identity.
*/
export function buildSketchHash(task: { code: string }, fqbn: string): string {
const payload = JSON.stringify({
code: task.code,
fqbn,
});
return createHash("sha256").update(payload).digest("hex");
}
/**
* Check whether a file exists on disk.
*/
export async function checkFileExists(filePath: string): Promise<boolean> {
try {
await stat(filePath);
return true;
} catch {
return false;
}
}
/**
* Check whether a compiled binary (.hex or .elf) exists in the given directory.
*/
export async function checkBinaryExists(binaryDir: string, sketchHash: string): Promise<boolean> {
try {
await stat(join(binaryDir, `${sketchHash}.hex`));
return true;
} catch {
try {
await stat(join(binaryDir, `${sketchHash}.elf`));
return true;
} catch {
return false;
}
}
}
/**
* Acquire a file-based lock with polling and timeout.
*/
export async function acquireCoreCacheLock(
lockPath: string,
timeoutMs: number = 120000,
): Promise<{ acquired: boolean; waitedMs: number }> {
const start = Date.now();
while (Date.now() - start < timeoutMs) {
try {
const fd = await open(lockPath, "wx");
await fd.writeFile(`${process.pid}:${new Date().toISOString()}`);
await fd.close();
return { acquired: true, waitedMs: Date.now() - start };
} catch (error: any) {
if (error?.code !== "EEXIST") {
throw error;
}
}
await new Promise((resolve) => setTimeout(resolve, 50));
}
return { acquired: false, waitedMs: Date.now() - start };
}
/**
* Scan a directory and collect records with size and access time.
*/
export async function collectDirectoryRecords(
targetDir: string,
): Promise<{ records: Array<{ fullPath: string; size: number; atimeMs: number }>; totalSize: number }> {
await mkdir(targetDir, { recursive: true });
const entries = await readdir(targetDir);
const records: Array<{ fullPath: string; size: number; atimeMs: number }> = [];
let totalSize = 0;
for (const entry of entries) {
const fullPath = join(targetDir, entry);
try {
const entryStat = await stat(fullPath);
const atimeMs = entryStat.atimeMs || entryStat.mtimeMs;
let size = entryStat.size;
if (entryStat.isDirectory()) {
const nested = await readdir(fullPath);
size = 0;
for (const nestedEntry of nested) {
const nestedStat = await stat(join(fullPath, nestedEntry));
size += nestedStat.size;
}
}
totalSize += size;
records.push({ fullPath, size, atimeMs });
} catch {
// ignore races with concurrent delete
}
}
return { records, totalSize };
}
/**
* Evict LRU entries from a sorted records list until total size is within budget.
*/
export async function evictLruEntries(
records: Array<{ fullPath: string; size: number; atimeMs: number }>,
totalSize: number,
maxBytes: number,
): Promise<void> {
records.sort((a, b) => a.atimeMs - b.atimeMs);
let remaining = totalSize;
for (const record of records) {
if (remaining <= maxBytes) break;
await rm(record.fullPath, { recursive: true, force: true });
remaining -= record.size;
}
}
/**
* LRU cleanup of build cache directories, debounced via marker file.
*/
export async function cleanupCacheLru(
buildCacheDir: string,
targets: string[],
maxBytes?: number,
): Promise<void> {
const markerPath = join(buildCacheDir, ".cleanup-marker");
const now = Date.now();
try {
const markerStat = await stat(markerPath);
if (now - markerStat.mtimeMs < 60_000) {
return;
}
} catch {
// continue cleanup if marker doesn't exist
}
const effectiveMax = maxBytes ?? Number(process.env.BUILD_CACHE_MAX_BYTES || 2 * 1024 * 1024 * 1024);
for (const targetDir of targets) {
try {
const { records, totalSize } = await collectDirectoryRecords(targetDir);
if (totalSize > effectiveMax) {
await evictLruEntries(records, totalSize, effectiveMax);
}
} catch {
// skip directories that cannot be read
}
}
await writeFile(markerPath, String(now));
}
/**
* Create multiple directories in parallel.
*/
export async function ensureDirectories(dirs: string[]): Promise<void> {
await Promise.all(dirs.map((dir) => mkdir(dir, { recursive: true })));
}
/**
* Spawn arduino-cli with JSON output and return parsed result.
*/
export async function execArduinoCliJson(args: string[]): Promise<any> {
const { spawn } = await import("node:child_process");
return new Promise((resolve) => {
const proc = spawn("arduino-cli", args);
let stdout = "";
let _stderr = "";
proc.stdout?.on("data", (data: Buffer) => {
stdout += data.toString();
});
proc.stderr?.on("data", (data: Buffer) => {
_stderr += data.toString();
});
proc.on("close", (code: number | null) => {
if (code !== 0) {
resolve(null);
return;
}
try {
resolve(stdout ? JSON.parse(stdout) : null);
} catch {
resolve(null);
}
});
proc.on("error", () => resolve(null));
});
}
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