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package restic
import (
"context"
"hash"
"io"
)
// Backend is used to store and access data.
//
// Backend operations that return an error will be retried when a Backend is
// wrapped in a RetryBackend. To prevent that from happening, the operations
// should return a github.com/cenkalti/backoff/v4.PermanentError. Errors from
// the context package need not be wrapped, as context cancellation is checked
// separately by the retrying logic.
type Backend interface {
// Location returns a string that describes the type and location of the
// repository.
Location() string
// Connections returns the maxmimum number of concurrent backend operations.
Connections() uint
// Hasher may return a hash function for calculating a content hash for the backend
Hasher() hash.Hash
// HasAtomicReplace returns whether Save() can atomically replace files
HasAtomicReplace() bool
// Remove removes a File described by h.
Remove(ctx context.Context, h Handle) error
// Close the backend
Close() error
// Save stores the data from rd under the given handle.
Save(ctx context.Context, h Handle, rd RewindReader) error
// 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.
//
// The function fn may be called multiple times during the same Load invocation
// and therefore must be idempotent.
//
// Implementations are encouraged to use backend.DefaultLoad
Load(ctx context.Context, h Handle, length int, offset int64, fn func(rd io.Reader) error) error
// Stat returns information about the File identified by h.
Stat(ctx context.Context, h Handle) (FileInfo, error)
// List runs fn for each file in the backend which has the type t. When an
// error occurs (or fn returns an error), List stops and returns it.
//
// The function fn is called exactly once for each file during successful
// execution and at most once in case of an error.
//
// The function fn is called in the same Goroutine that List() is called
// from.
List(ctx context.Context, t FileType, fn func(FileInfo) error) error
// IsNotExist returns true if the error was caused by a non-existing file
// in the backend.
//
// The argument may be a wrapped error. The implementation is responsible
// for unwrapping it.
IsNotExist(err error) bool
// Delete removes all data in the backend.
Delete(ctx context.Context) error
}
// FileInfo is contains information about a file in the backend.
type FileInfo struct {
Size int64
Name string
}
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