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backend: add IsPermanentError() method to interface

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This commit is contained in:
Michael Eischer 2024-05-11 00:12:56 +02:00
parent cfc420664a
commit 6a85df7297
3 changed files with 22 additions and 1 deletions
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10
internal/backend/backend.go
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@ -38,7 +38,9 @@ type Backend interface {
// Load runs fn with a reader that yields the contents of the file at h at the
// given offset. If length is larger than zero, only a portion of the file
// is read.
// is read. If the length is larger than zero and the file is too short to return
// the requested length bytes, then an error MUST be returned that is recognized
// by IsPermanentError().
//
// The function fn may be called multiple times during the same Load invocation
// and therefore must be idempotent.
@ -66,6 +68,12 @@ type Backend interface {
// for unwrapping it.
IsNotExist(err error) bool
// IsPermanentError returns true if the error can very likely not be resolved
// by retrying the operation. Backends should return true if the file is missing,
// the requested range does not (completely) exist in the file or the user is
// not authorized to perform the requested operation.
IsPermanentError(err error) bool
// Delete removes all data in the backend.
Delete(ctx context.Context) error
}

4
internal/backend/dryrun/dry_backend.go
View file

@ -72,6 +72,10 @@ func (be *Backend) IsNotExist(err error) bool {
return be.b.IsNotExist(err)
}
func (be *Backend) IsPermanentError(err error) bool {
return be.b.IsPermanentError(err)
}
func (be *Backend) List(ctx context.Context, t backend.FileType, fn func(backend.FileInfo) error) error {
return be.b.List(ctx, t, fn)
}

9
internal/backend/mock/backend.go
View file

@ -13,6 +13,7 @@ import (
type Backend struct {
CloseFn func() error
IsNotExistFn func(err error) bool
IsPermanentErrorFn func(err error) bool
SaveFn func(ctx context.Context, h backend.Handle, rd backend.RewindReader) error
OpenReaderFn func(ctx context.Context, h backend.Handle, length int, offset int64) (io.ReadCloser, error)
StatFn func(ctx context.Context, h backend.Handle) (backend.FileInfo, error)
@ -83,6 +84,14 @@ func (m *Backend) IsNotExist(err error) bool {
return m.IsNotExistFn(err)
}
func (m *Backend) IsPermanentError(err error) bool {
if m.IsPermanentErrorFn == nil {
return false
}
return m.IsPermanentErrorFn(err)
}
// Save data in the backend.
func (m *Backend) Save(ctx context.Context, h backend.Handle, rd backend.RewindReader) error {
if m.SaveFn == nil {