[performance]: make s3 urls cacheable (#1194)

Implements #864 and should speed up s3 based installations by a lot.

With more static urls, we can then also implement #1026 for even
better performance when used in conjunction with CDNs

internal/storage/storage.go

@@ -26,6 +26,7 @@ import (
 	"path"
 	"time"
 
+	"codeberg.org/gruf/go-cache/v3"
 	"codeberg.org/gruf/go-store/v2/kv"
 	"codeberg.org/gruf/go-store/v2/storage"
 	"github.com/minio/minio-go/v7"
@@ -33,6 +34,11 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 )
 
+const (
+	urlCacheTTL             = time.Hour * 24
+	urlCacheExpiryFrequency = time.Minute * 5
+)
+
 // ErrAlreadyExists is a ptr to underlying storage.ErrAlreadyExists,
 // to put the related errors in the same package as our storage wrapper.
 var ErrAlreadyExists = storage.ErrAlreadyExists
@@ -44,8 +50,9 @@ type Driver struct {
 	Storage storage.Storage
 
 	// S3-only parameters
-	Proxy  bool
-	Bucket string
+	Proxy          bool
+	Bucket         string
+	PresignedCache cache.Cache[string, *url.URL]
 }
 
 // URL will return a presigned GET object URL, but only if running on S3 storage with proxying disabled.
@@ -56,74 +63,90 @@ func (d *Driver) URL(ctx context.Context, key string) *url.URL {
 		return nil
 	}
 
-	// If URL request fails, fallback is to fetch the file. So ignore the error here
-	url, _ := s3.Client().PresignedGetObject(ctx, d.Bucket, key, time.Hour, url.Values{
+	if u, ok := d.PresignedCache.Get(key); ok {
+		return u
+	}
+
+	u, err := s3.Client().PresignedGetObject(ctx, d.Bucket, key, urlCacheTTL, url.Values{
 		"response-content-type": []string{mime.TypeByExtension(path.Ext(key))},
 	})
-
-	return url
+	if err != nil {
+		// If URL request fails, fallback is to fetch the file. So ignore the error here
+		return nil
+	}
+	d.PresignedCache.Set(key, u)
+	return u
 }
 
 func AutoConfig() (*Driver, error) {
-	var st storage.Storage
-
 	switch backend := config.GetStorageBackend(); backend {
 	case "s3":
-		// Load runtime configuration
-		endpoint := config.GetStorageS3Endpoint()
-		access := config.GetStorageS3AccessKey()
-		secret := config.GetStorageS3SecretKey()
-		secure := config.GetStorageS3UseSSL()
-		bucket := config.GetStorageS3BucketName()
-
-		// Open the s3 storage implementation
-		s3, err := storage.OpenS3(endpoint, bucket, &storage.S3Config{
-			CoreOpts: minio.Options{
-				Creds:  credentials.NewStaticV4(access, secret, ""),
-				Secure: secure,
-			},
-			GetOpts:      minio.GetObjectOptions{},
-			PutOpts:      minio.PutObjectOptions{},
-			PutChunkSize: 5 * 1024 * 1024, // 5MiB
-			StatOpts:     minio.StatObjectOptions{},
-			RemoveOpts:   minio.RemoveObjectOptions{},
-			ListSize:     200,
-		})
-		if err != nil {
-			return nil, fmt.Errorf("error opening s3 storage: %w", err)
-		}
-
-		// Set storage impl
-		st = s3
-
+		return NewS3Storage()
 	case "local":
-		// Load runtime configuration
-		basePath := config.GetStorageLocalBasePath()
-
-		// Open the disk storage implementation
-		disk, err := storage.OpenDisk(basePath, &storage.DiskConfig{
-			// Put the store lockfile in the storage dir itself.
-			// Normally this would not be safe, since we could end up
-			// overwriting the lockfile if we store a file called 'store.lock'.
-			// However, in this case it's OK because the keys are set by
-			// GtS and not the user, so we know we're never going to overwrite it.
-			LockFile: path.Join(basePath, "store.lock"),
-		})
-		if err != nil {
-			return nil, fmt.Errorf("error opening disk storage: %w", err)
-		}
-
-		// Set storage impl
-		st = disk
-
+		return NewFileStorage()
 	default:
 		return nil, fmt.Errorf("invalid storage backend: %s", backend)
 	}
 
+}
+
+func NewFileStorage() (*Driver, error) {
+	// Load runtime configuration
+	basePath := config.GetStorageLocalBasePath()
+
+	// Open the disk storage implementation
+	disk, err := storage.OpenDisk(basePath, &storage.DiskConfig{
+		// Put the store lockfile in the storage dir itself.
+		// Normally this would not be safe, since we could end up
+		// overwriting the lockfile if we store a file called 'store.lock'.
+		// However, in this case it's OK because the keys are set by
+		// GtS and not the user, so we know we're never going to overwrite it.
+		LockFile: path.Join(basePath, "store.lock"),
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error opening disk storage: %w", err)
+	}
+
 	return &Driver{
-		KVStore: kv.New(st),
-		Proxy:   config.GetStorageS3Proxy(),
-		Bucket:  config.GetStorageS3BucketName(),
-		Storage: st,
+		KVStore: kv.New(disk),
+		Storage: disk,
+	}, nil
+}
+
+func NewS3Storage() (*Driver, error) {
+	// Load runtime configuration
+	endpoint := config.GetStorageS3Endpoint()
+	access := config.GetStorageS3AccessKey()
+	secret := config.GetStorageS3SecretKey()
+	secure := config.GetStorageS3UseSSL()
+	bucket := config.GetStorageS3BucketName()
+
+	// Open the s3 storage implementation
+	s3, err := storage.OpenS3(endpoint, bucket, &storage.S3Config{
+		CoreOpts: minio.Options{
+			Creds:  credentials.NewStaticV4(access, secret, ""),
+			Secure: secure,
+		},
+		GetOpts:      minio.GetObjectOptions{},
+		PutOpts:      minio.PutObjectOptions{},
+		PutChunkSize: 5 * 1024 * 1024, // 5MiB
+		StatOpts:     minio.StatObjectOptions{},
+		RemoveOpts:   minio.RemoveObjectOptions{},
+		ListSize:     200,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error opening s3 storage: %w", err)
+	}
+
+	// ttl should be lower than the expiry used by S3 to avoid serving invalid URLs
+	presignedCache := cache.New[string, *url.URL](0, 1000, urlCacheTTL-urlCacheExpiryFrequency)
+	presignedCache.Start(urlCacheExpiryFrequency)
+
+	return &Driver{
+		KVStore:        kv.New(s3),
+		Proxy:          config.GetStorageS3Proxy(),
+		Bucket:         config.GetStorageS3BucketName(),
+		Storage:        s3,
+		PresignedCache: presignedCache,
 	}, nil
 }