datastore

persist/datastore

Google Cloud Datastore persistence with native TTL support.

Features

• Scales automatically, native TTL support
• JSON encoding with base64 for binary safety
• Streaming loads for warmup
• Works across Cloud Run instances

Usage

import (
    "github.com/codeGROOVE-dev/bdcache"
    "github.com/codeGROOVE-dev/bdcache/persist/datastore"
)

// cacheID becomes the Datastore database name
p, _ := datastore.New[string, User](ctx, "myapp")

// Optional: clean up stale entries on startup
p.Cleanup(ctx, 24*time.Hour)

cache, _ := bdcache.New[string, User](ctx,
    bdcache.WithPersistence(p))

TTL Setup (Recommended)

gcloud firestore fields ttls update expiry \
  --collection-group=CacheEntry \
  --enable-ttl \
  --database=myapp

One-time setup per database. Datastore deletes expired entries within 24 hours.

Fallback Pattern

p, err := datastore.New[string, User](ctx, "myapp")
if err != nil {
    p, _ = localfs.New[string, User]("myapp", "")
}

Key Constraints

• Maximum key length: 1500 characters (Datastore limit)