mirror of https://github.com/octoleo/restic.git
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
package backend
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import (
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"fmt"
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"io"
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)
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// Type is the type of a Blob.
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type Type string
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// These are the different data types a backend can store.
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const (
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Data Type = "data"
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Key = "key"
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Lock = "lock"
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Snapshot = "snapshot"
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Index = "index"
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Config = "config"
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)
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// Handle is used to store and access data in a backend.
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type Handle struct {
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Type Type
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Name string
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}
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func (h Handle) String() string {
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name := h.Name
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if len(name) > 10 {
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name = name[:10]
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}
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return fmt.Sprintf("<%s/%s>", h.Type, name)
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}
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// Backend is used to store and access data.
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type Backend interface {
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// Location returns a string that describes the type and location of the
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// repository.
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Location() string
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// Create creates a new Blob. The data is available only after Finalize()
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// has been called on the returned Blob.
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Create() (Blob, error)
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// Get returns an io.ReadCloser for the Blob with the given name of type t.
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Get(t Type, name string) (io.ReadCloser, error)
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// GetReader returns an io.ReadCloser for the Blob with the given name of
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// type t at offset and length.
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GetReader(t Type, name string, offset, length uint) (io.ReadCloser, error)
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// Test a boolean value whether a Blob with the name and type exists.
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Test(t Type, name string) (bool, error)
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// Remove removes a Blob with type t and name.
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Remove(t Type, name string) error
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// Close the backend
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Close() error
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Lister
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}
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// Lister implements listing data items stored in a backend.
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type Lister interface {
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// List returns a channel that yields all names of blobs of type t in
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// lexicographic order. A goroutine is started for this. If the channel
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// done is closed, sending stops.
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List(t Type, done <-chan struct{}) <-chan string
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}
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// Deleter are backends that allow to self-delete all content stored in them.
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type Deleter interface {
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// Delete the complete repository.
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Delete() error
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}
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// Blob is old.
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type Blob interface {
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io.Writer
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// Finalize moves the data blob to the final location for type and name.
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Finalize(t Type, name string) error
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// Size returns the number of bytes written to the backend so far.
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Size() uint
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}
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