restic/backend/interface.go

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package backend
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import "io"
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// Type is the type of a Blob.
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type Type string
const (
Data Type = "data"
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Key = "key"
Lock = "lock"
Snapshot = "snapshot"
Tree = "tree"
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Index = "index"
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)
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const (
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Version = 1
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)
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// A Backend manages blobs of data.
type Backend interface {
// Location returns a string that specifies the location of the repository,
// like a URL.
Location() string
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// Create creates a new Blob. The data is available only after Finalize()
// has been called on the returned Blob.
Create() (Blob, error)
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// Get returns an io.ReadCloser for the Blob with the given name of type t.
Get(t Type, name string) (io.ReadCloser, error)
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// Test a boolean value whether a Blob with the name and type exists.
Test(t Type, name string) (bool, error)
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// Remove removes a Blob with type t and name.
Remove(t Type, name string) error
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// Close the backend
Close() error
Identifier
Lister
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}
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type Identifier interface {
// ID returns a unique ID for a specific repository. This means restic can
// recognize repositories accessed via different methods (e.g. local file
// access and sftp).
ID() string
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}
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type Lister interface {
// List returns a channel that yields all names of blobs of type t in
// lexicographic order. A goroutine is started for this. If the channel
// done is closed, sending stops.
List(t Type, done <-chan struct{}) <-chan string
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}
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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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type Blob interface {
io.Writer
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// Finalize moves the data blob to the final location for type and name.
Finalize(t Type, name string) error
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// Size returns the number of bytes written to the backend so far.
Size() uint
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}