1 files changed, 117 insertions, 0 deletions
diff --git a/scripts/cache/s3.ts b/scripts/cache/s3.ts
new file mode 100644
index 0000000..ffbb6ac
--- /dev/null
+++ b/scripts/cache/s3.ts
@@ -0,0 +1,117 @@
+import { S3Client } from 'bun';
+import { MAX_CACHE_AGE_DAYS, MAX_CACHE_FILES } from './utils';
+import { findCacheByKey, findCacheByPrefix, loadManifest, removeCacheEntry } from './manifest';
+import { deleteMetadata } from './metadata';
+
+const s3Config = {
+    ENDPOINT: process.env.S3_ENDPOINT,
+    ACCESS_KEY_ID: process.env.S3_ACCESS_KEY_ID,
+    SECRET_ACCESS_KEY: process.env.S3_SECRET_ACCESS_KEY,
+    BUCKET_NAME: process.env.S3_BUCKET_NAME,
+    REGION: process.env.S3_REGION
+};
+
+export const ENABLED =
+    !!s3Config.ENDPOINT &&
+    !!s3Config.ACCESS_KEY_ID &&
+    !!s3Config.SECRET_ACCESS_KEY &&
+    !!s3Config.BUCKET_NAME;
+
+let client: S3Client | null = null;
+
+export function getClient(): S3Client | null {
+    if (!ENABLED || client) return client;
+
+    client = new S3Client({
+        endpoint: s3Config.ENDPOINT,
+        accessKeyId: s3Config.ACCESS_KEY_ID,
+        secretAccessKey: s3Config.SECRET_ACCESS_KEY,
+        bucket: s3Config.BUCKET_NAME,
+        region: s3Config.REGION
+    });
+    return client;
+}
+
+const cacheExists = async (s3: S3Client, key: string) =>
+    await s3
+        .file(key)
+        .exists()
+        .catch(() => false);
+
+const cleanupStaleCache = async (s3: S3Client, key: string): Promise<void> => {
+    console.log(`Cleaning stale cache from manifest (cache missing): ${key}`);
+    await deleteMetadata(s3, key);
+    await removeCacheEntry(s3, key);
+};
+
+export async function resolveCacheKey(
+    s3: S3Client,
+    key: string,
+    restoreKeys?: string[]
+): Promise<string | null> {
+    const manifest = await loadManifest(s3);
+
+    // Try exact match first
+    const exactMatch = findCacheByKey(manifest, key);
+    if (exactMatch) {
+        if (await cacheExists(s3, exactMatch.key)) {
+            return exactMatch.key;
+        }
+        await cleanupStaleCache(s3, exactMatch.key);
+    }
+
+    // Try restore keys in order (prefix matching), preferring most recent
+    if (restoreKeys && restoreKeys.length > 0) {
+        for (const prefix of restoreKeys) {
+            const match = findCacheByPrefix(manifest, prefix);
+            if (match) {
+                if (await cacheExists(s3, match.key)) {
+                    return match.key;
+                }
+                await cleanupStaleCache(s3, match.key);
+            }
+        }
+    }
+
+    return null;
+}
+
+export async function cleanupOldCaches(s3: S3Client, prefix: string): Promise<void> {
+    const manifest = await loadManifest(s3);
+
+    // Filter caches by prefix
+    const filesWithMetadata = manifest.caches
+        .filter((entry) => entry.key.startsWith(prefix))
+        .map((entry) => ({
+            key: entry.key,
+            lastAccessed: entry.lastAccessed,
+            timestamp: entry.timestamp
+        }));
+
+    // Sort by lastAccessed (most recently accessed first)
+    const files = filesWithMetadata.sort((a, b) => b.lastAccessed - a.lastAccessed);
+
+    const now = Date.now();
+    const maxAge = MAX_CACHE_AGE_DAYS * 24 * 60 * 60 * 1000;
+    let manifestUpdated = false;
+
+    for (let i = 0; i < files.length; i++) {
+        const entry = files[i];
+        const age = now - entry.lastAccessed;
+        const shouldDelete = i >= MAX_CACHE_FILES || age > maxAge;
+
+        if (shouldDelete) {
+            console.log(
+                `Deleting cache: ${entry.key} (age: ${Math.floor(age / (24 * 60 * 60 * 1000))} days, position: ${i + 1})`
+            );
+            await s3.file(entry.key).delete();
+            await deleteMetadata(s3, entry.key);
+            await removeCacheEntry(s3, entry.key);
+            manifestUpdated = true;
+        }
+    }
+
+    if (manifestUpdated) {
+        console.log('Manifest updated after cleanup');
+    }
+}