cloud-datastore-interceptor
Package github.com/DeNA/cloud-datastore-interceptor provides gRPC interceptors for Cloud Datastore(cloud.google.com/go/datastore).
Examples
In-Memory cache
This will use in-memory cache on Client.Get and Client.GetMulti.
opts := []option.ClientOption{
option.WithGRPCDialOption(
grpc.WithUnaryInterceptor(
cache.UnaryClientInterceptor(memory.NewCache(1 * time.Minute)),
),
),
}
client, err := datastore.NewClient(ctx, projID, opts...)Cache query results
cache.UnaryClientInterceptor does not use the cache for Query(e.g., Client.GetAll, Client.Run), but by using transform.QueryToLookupWithKeysOnly, it is transformed to gRPC equivalent to Client.GetMulti and the cache is used.
opts := []option.ClientOption{
option.WithGRPCDialOption(
grpc.WithChainUnaryInterceptor(
transform.QueryToLookupWithKeysOnly(),
cache.UnaryClientInterceptor(memory.NewCache(1*time.Minute)),
),
),
}
client, err := datastore.NewClient(ctx, projID, opts...)Redis cache
Same as In-Memory cache, but the backend is Redis using redisClient.
opts := []option.ClientOption{
option.WithGRPCDialOption(
grpc.WithUnaryInterceptor(
cache.UnaryClientInterceptor(redis.NewCache(1*time.Minute, redisClient)),
),
),
}
client, err := datastore.NewClient(ctx, projID, opts...)