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import { $ } from 'bun';
import { mkdir, readdir, rm, exists } from 'fs/promises';
import { join, relative, sep } from 'path';
import type { CacheMetadata, FileMetadata } from './utils';
export async function calculateFileChecksum(filePath: string): Promise<string> {
const fileBlob = Bun.file(filePath);
const size = fileBlob.size;
const hasher = new Bun.CryptoHasher('sha256');
if (size <= 10 * 1024 * 1024 /** 10MB */)
return hasher.update(await fileBlob.arrayBuffer()).digest('hex');
const reader = fileBlob.stream().getReader();
while (true) {
const { done, value } = await reader.read();
if (done) break;
if (value) hasher.update(value);
}
return hasher.digest('hex');
}
export async function calculateDirectoryChecksums(
paths: string[]
): Promise<Record<string, FileMetadata>> {
const files: Record<string, FileMetadata> = {};
for (const path of paths) {
const entries = await readdir(path, {
recursive: true,
withFileTypes: true
});
await Promise.all(
entries
.filter((entry) => entry.isFile())
.map(async (entry) => {
const fullPath = join(entry.parentPath, entry.name);
const relativePath = relative('.', fullPath).split(sep).join('/');
const size = Bun.file(fullPath).size;
const checksum = await calculateFileChecksum(fullPath);
files[relativePath] = { checksum, size };
})
);
}
return files;
}
export async function validateCache(metadata: CacheMetadata): Promise<boolean> {
console.log('Validating cache...');
let valid = 0;
let invalid = 0;
let missing = 0;
const totalFiles = Object.keys(metadata.files).length;
for (const [filePath, fileInfo] of Object.entries(metadata.files)) {
const fullPath = join('.', filePath);
if (!(await exists(fullPath))) {
missing++;
continue;
}
try {
const actualChecksum = await calculateFileChecksum(fullPath);
if (actualChecksum === fileInfo.checksum) valid++;
else invalid++;
} catch (e) {
invalid++;
}
}
const isValid = invalid === 0 && missing === 0;
if (isValid) {
console.log(`Cache is valid: ${valid} files matched`);
} else {
console.log(
`Cache validation failed: ${valid} valid, ${invalid} invalid, ${missing} missing (total: ${totalFiles})`
);
}
return isValid;
}
export async function extractTar(tarPath: string): Promise<void> {
const compressedData = await Bun.file(tarPath).arrayBuffer();
const decompressed = Bun.zstdDecompressSync(new Uint8Array(compressedData));
// Write decompressed tar to temp file
const tempTarPath = tarPath + '.tmp';
await Bun.write(tempTarPath, decompressed);
await $`tar -xf ${tempTarPath}`.quiet().finally(async () => {
await rm(tempTarPath).catch(() => {});
});
}
export async function compressToTar(
paths: string[],
outputPath: string
): Promise<Record<string, FileMetadata>> {
const checksums = await calculateDirectoryChecksums(paths);
const tempTarPath = outputPath + '.tmp';
await $`tar -cf ${tempTarPath} ${paths}`.quiet();
try {
const tarData = await Bun.file(tempTarPath).arrayBuffer();
const compressed = Bun.zstdCompressSync(new Uint8Array(tarData));
await Bun.write(outputPath, compressed);
} finally {
await rm(tempTarPath).catch(() => {});
}
return checksums;
}
export async function ensureDir(dir: string): Promise<void> {
if (!(await exists(dir))) {
await mkdir(dir, { recursive: true });
}
}
export async function cleanupDir(dir: string): Promise<void> {
try {
await rm(dir, { recursive: true, force: true });
} catch (e: any) {
if (e.code !== 'EBUSY' && e.code !== 'ENOTEMPTY') {
throw e;
}
}
}
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