[performance] add optional S3 object info caching (#4546)

This adds an optional S3 object info cache to the S3 storage driver backend (see [here](https://codeberg.org/gruf/go-storage/releases/tag/v0.4.0)) to reduce S3 calls largely during media cleanup operations, but it should also help in other situations cutting back on S3 calls when for example a key is already known to not exist.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4546
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/vendor/codeberg.org/gruf/go-storage/s3/errors.go b/vendor/codeberg.org/gruf/go-storage/s3/errors.go
index 1f4404469..0b2d3be62 100644
--- a/vendor/codeberg.org/gruf/go-storage/s3/errors.go
+++ b/vendor/codeberg.org/gruf/go-storage/s3/errors.go
@@ -3,9 +3,35 @@ package s3
 import (
 	"strings"
 
+	"codeberg.org/gruf/go-storage"
+	"codeberg.org/gruf/go-storage/internal"
 	"github.com/minio/minio-go/v7"
 )
 
+// CachedErrorResponse can be returned
+// when an S3 is configured with caching,
+// and the basic details of an error
+// response have been stored in the cache.
+type CachedErrorResponse struct {
+	Code string
+	Key  string
+}
+
+func (err *CachedErrorResponse) Error() string {
+	return "cached '" + err.Code + "' response for key:" + err.Key
+}
+
+func (err *CachedErrorResponse) Is(other error) bool {
+	switch other {
+	case storage.ErrNotFound:
+		return err.Code == "NoSuchKey"
+	case storage.ErrAlreadyExists:
+		return err.Code == "Conflict"
+	default:
+		return false
+	}
+}
+
 func isNotFoundError(err error) bool {
 	errRsp, ok := err.(minio.ErrorResponse)
 	return ok && errRsp.Code == "NoSuchKey"
@@ -19,3 +45,8 @@ func isConflictError(err error) bool {
 func isObjectNameError(err error) bool {
 	return strings.HasPrefix(err.Error(), "Object name ")
 }
+
+func cachedNotFoundError(key string) error {
+	err := CachedErrorResponse{Code: "NoSuchKey", Key: key}
+	return internal.WrapErr(&err, storage.ErrNotFound)
+}