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import type { S3Client } from 'bun';
import { join } from 'path';
import { cleanupDir, compressToTar, ensureDir, extractTar, validateCache } from './cache/files';
import { withLock } from './cache/lock';
import { log } from './cache/logger';
import { addCacheEntry } from './cache/manifest';
import { loadMetadata, saveMetadata, updateBothAccessTimes } from './cache/metadata';
import { cleanupOldCaches, ENABLED, getClient, resolveCacheKey } from './cache/s3';
import { CACHE_FILE_NAME, TMP_DIR } from './cache/utils';
const CACHE_FILE_PATH = join(TMP_DIR, CACHE_FILE_NAME);
function formatBytes(bytes: number): string {
return (bytes / (1024 * 1024)).toFixed(2);
}
async function downloadCache(s3: S3Client, key: string, targetPath: string): Promise<number> {
const s3File = s3.file(key);
const stream = s3File.stream();
const writer = Bun.file(targetPath).writer();
const transfer = log.transfer('Received');
let downloadedBytes = 0;
for await (const chunk of stream) {
writer.write(chunk);
downloadedBytes += chunk.length;
transfer.progress(downloadedBytes);
}
await writer.end();
transfer.complete(downloadedBytes);
return downloadedBytes;
}
async function uploadCache(s3: S3Client, key: string, sourcePath: string): Promise<number> {
const cacheFile = Bun.file(sourcePath);
const stream = cacheFile.stream();
const s3File = s3.file(key);
const writer = s3File.writer({
partSize: 10 * 1024 * 1024, // 10 MB
queueSize: 4,
retry: 3
});
const timer = log.timer('Uploading cache');
let uploadedBytes = 0;
// Start a timer to log progress every second
const progressInterval = setInterval(() => {
timer.progress();
}, 1000);
try {
for await (const chunk of stream) {
writer.write(chunk);
uploadedBytes += chunk.length;
}
await writer.end();
return uploadedBytes;
} finally {
clearInterval(progressInterval);
timer.complete();
}
}
export async function restoreCache(
paths: string[],
key: string,
restoreKeys?: string[]
): Promise<string | undefined> {
if (!ENABLED) {
console.log('R2 Cache disabled');
return undefined;
}
const s3 = getClient();
if (!s3) return undefined;
try {
// Find matching cache (exact or prefix match)
const matchedKey = await resolveCacheKey(s3, key, restoreKeys);
if (!matchedKey) {
console.log('Cache not found');
return undefined;
}
// Check if local cache is still valid
const metadata = await loadMetadata(s3, matchedKey);
if (metadata && (await validateCache(metadata))) {
await updateBothAccessTimes(s3, matchedKey, metadata);
return matchedKey;
}
await ensureDir(TMP_DIR);
// Ensure all target paths exist
for (const path of paths) {
await ensureDir(path);
}
console.log(`Downloading cache from key: ${matchedKey}`);
const startTime = Date.now();
const downloadedBytes = await downloadCache(s3, matchedKey, CACHE_FILE_PATH);
const downloadTime = Date.now() - startTime;
const sizeInMB = formatBytes(downloadedBytes);
console.log(`Cache Size: ~${sizeInMB} MB (${downloadedBytes} B)`);
console.log(`Cache downloaded in ${(downloadTime / 1000).toFixed(2)}s`);
console.log('Extracting cache...');
const extractStartTime = Date.now();
await extractTar(CACHE_FILE_PATH);
const extractTime = Date.now() - extractStartTime;
console.log(`Cache extracted in ${(extractTime / 1000).toFixed(2)}s`);
await cleanupDir(TMP_DIR);
// Update access time after successful restore
const newMetadata = await loadMetadata(s3, matchedKey);
if (newMetadata) {
await updateBothAccessTimes(s3, matchedKey, newMetadata);
}
console.log(`Cache restored successfully`);
return matchedKey;
} catch (e) {
console.error('Failed to restore cache:', e);
return undefined;
}
}
export async function saveCache(paths: string[], key: string): Promise<void> {
if (!ENABLED) return;
const s3 = getClient();
if (!s3) return;
// Use withLock for automatic lock management with renewal
const result = await withLock(s3, async () => {
// Check if cache already exists before compressing
const cacheFile = s3.file(key);
if (await cacheFile.exists()) {
console.log(`Cache already exists: ${key}, skipping upload`);
return;
}
await ensureDir(TMP_DIR);
// Compress and calculate checksums
console.log('Compressing cache...');
const compressStartTime = Date.now();
const files = await compressToTar(paths, CACHE_FILE_PATH);
const compressTime = Date.now() - compressStartTime;
console.log(`Cache compressed in ${(compressTime / 1000).toFixed(2)}s`);
const cache = Bun.file(CACHE_FILE_PATH);
const sizeInBytes = cache.size;
const sizeInMB = formatBytes(sizeInBytes);
console.log(`Cache Size: ~${sizeInMB} MB (${sizeInBytes} B)`);
console.log(`Uploading cache to key: ${key}`);
const startTime = Date.now();
await uploadCache(s3, key, CACHE_FILE_PATH);
const uploadTime = Date.now() - startTime;
const uploadSpeed = sizeInBytes / (1024 * 1024) / (uploadTime / 1000);
console.log(
`Cache uploaded in ${(uploadTime / 1000).toFixed(2)}s (${uploadSpeed.toFixed(2)} MB/s)`
);
const timestamp = Date.now();
// Save metadata and get hash
const hash = await saveMetadata(s3, key, files, CACHE_FILE_PATH);
await cleanupDir(TMP_DIR);
// Add entry to manifest
await addCacheEntry(s3, key, hash, timestamp);
console.log(`Cache saved successfully`);
// Extract prefix for cleanup (e.g., "extensions-abc.tgz" -> "extensions-")
const prefix = key.split('-')[0] + '-';
await cleanupOldCaches(s3, prefix);
return;
});
if (result === null) {
console.error('Failed to acquire lock for cache save');
}
}
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