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import { join } from "node:path";
import { Logger } from "@shared/logger";
const logger = new Logger("CacheManager");
export interface CacheHitResult {
cached: boolean;
binary: Buffer | null;
cacheType: "instant" | "hex" | "none";
cachedOutput: string | null;
}
export interface CachePaths {
binaryStorageDir: string;
hexCacheDir: string;
}
/**
* Reads binary from storage (tries .hex and .elf extensions).
* Updates access time on hit.
*/
export async function readBinaryFromStorage(
sketchHash: string,
storageDir: string,
): Promise<Buffer | null> {
const hexPath = join(storageDir, `${sketchHash}.hex`);
const elfPath = join(storageDir, `${sketchHash}.elf`);
for (const path of [hexPath, elfPath]) {
try {
const binary = await readFile(path);
const now = new Date();
await utimes(path, now, now).catch(() => undefined);
return binary;
} catch {
// continue probing next extension
}
}
return null;
}
/**
* Writes binary to storage using atomic rename pattern.
*/
export async function writeBinaryToStorage(
sketchHash: string,
binary: Buffer,
storageDir: string,
): Promise<void> {
const targetPath = join(storageDir, `${sketchHash}.hex`);
const tmpPath = `${targetPath}.tmp-${process.pid}-${Date.now()}`;
await mkdir(storageDir, { recursive: true });
await writeFile(tmpPath, binary);
await rename(tmpPath, targetPath);
}
/**
* Writes output text to cache.
*/
export async function writeOutputToCache(
storageDir: string,
sketchHash: string,
output: string,
): Promise<void> {
const outputPath = join(storageDir, `${sketchHash}.output.txt`);
await writeFile(outputPath, output, "utf8");
}
/**
* Reads output text from cache.
*/
export async function readOutputFromCache(
storageDir: string,
sketchHash: string,
): Promise<string | null> {
const outputPath = join(storageDir, `${sketchHash}.output.txt`);
try {
return await readFile(outputPath, "utf8");
} catch {
return null;
}
}
/**
* Reads HEX binary from cache.
* Updates access time on hit.
*/
export async function readHexFromCache(
sketchHash: string,
hexCacheDir: string,
): Promise<Buffer | null> {
const cachePath = join(hexCacheDir, `${sketchHash}.hex`);
try {
const binary = await readFile(cachePath);
const now = new Date();
await utimes(cachePath, now, now).catch(() => undefined);
return binary;
} catch {
return null;
}
}
/**
* Writes HEX binary to cache using atomic rename pattern.
*/
export async function writeHexToCache(
sketchHash: string,
hexCacheDir: string,
binary: Buffer,
): Promise<void> {
const cachePath = join(hexCacheDir, `${sketchHash}.hex`);
const tmpPath = `${cachePath}.tmp-${process.pid}-${Date.now()}`;
await mkdir(hexCacheDir, { recursive: true });
await writeFile(tmpPath, binary);
await rename(tmpPath, cachePath);
}
/**
* LRU-style cleanup of hex cache to stay under maxBytes.
*/
export async function runHexCacheCleanup(
hexCacheDir: string,
maxBytes: number = 512 * 1024 * 1024,
): Promise<void> {
try {
const entries = await readdir(hexCacheDir);
const files: Array<{ path: string; sidecarPath: string; size: number; atimeMs: number }> = [];
let totalSize = 0;
for (const entry of entries) {
if (!entry.endsWith(".hex")) continue;
const fullPath = join(hexCacheDir, entry);
try {
const fileStat = await stat(fullPath);
if (!fileStat.isFile()) continue;
totalSize += fileStat.size;
files.push({
path: fullPath,
sidecarPath: join(hexCacheDir, `${entry.slice(0, -".hex".length)}.output.txt`),
size: fileStat.size,
atimeMs: fileStat.atimeMs || fileStat.mtimeMs,
});
} catch {
// ignore disappearing files
}
}
if (totalSize <= maxBytes) return;
files.sort((a, b) => a.atimeMs - b.atimeMs);
for (const file of files) {
if (totalSize <= maxBytes) break;
await rm(file.path, { force: true });
// The output sidecar is useless without its binary and must not outlive it.
await rm(file.sidecarPath, { force: true });
totalSize -= file.size;
}
} catch (error) {
logger.debug(`[CacheCleanup] skipped: ${error instanceof Error ? error.message : String(error)}`);
}
}
/**
* Checks both instant binary cache and hex cache for a compiled sketch.
* Returns cache hit info including output sidecar.
*/
export async function checkCacheHits(
sketchHash: string,
paths: CachePaths,
compileStartedAt: bigint,
): Promise<CacheHitResult> {
// Check instant binary cache first (most recent)
const instantBinary = await readBinaryFromStorage(sketchHash, paths.binaryStorageDir);
if (instantBinary) {
const elapsedMs = Number((process.hrtime.bigint() - compileStartedAt) / BigInt(1_000_000));
logger.info(`[Cache] Hit for hash ${sketchHash} (${elapsedMs}ms)`);
const cachedOutput = await readOutputFromCache(paths.binaryStorageDir, sketchHash);
return { cached: true, binary: instantBinary, cacheType: "instant", cachedOutput };
}
// Check hex cache (persistent, shared across sessions)
const cachedBinary = await readHexFromCache(sketchHash, paths.hexCacheDir);
if (cachedBinary) {
const elapsedMs = Number((process.hrtime.bigint() - compileStartedAt) / BigInt(1_000_000));
logger.info(`[Cache] Hit for hash ${sketchHash} (${elapsedMs}ms)`);
const cachedOutput = await readOutputFromCache(paths.hexCacheDir, sketchHash);
return { cached: true, binary: cachedBinary, cacheType: "hex", cachedOutput };
}
return { cached: false, binary: null, cacheType: "none", cachedOutput: null };
}
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