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68 lines
2.2 KiB
Go
68 lines
2.2 KiB
Go
package restic
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import (
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"context"
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"io"
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)
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// Backend is used to store and access data.
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//
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// Backend operations that return an error will be retried when a Backend is
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// wrapped in a RetryBackend. To prevent that from happening, the operations
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// should return a github.com/cenkalti/backoff/v4.PermanentError. Errors from
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// the context package need not be wrapped, as context cancellation is checked
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// separately by the retrying logic.
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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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// Test a boolean value whether a File with the name and type exists.
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Test(ctx context.Context, h Handle) (bool, error)
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// Remove removes a File described by h.
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Remove(ctx context.Context, h Handle) error
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// Close the backend
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Close() error
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// Save stores the data from rd under the given handle.
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Save(ctx context.Context, h Handle, rd RewindReader) error
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// Load runs fn with a reader that yields the contents of the file at h at the
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// given offset. If length is larger than zero, only a portion of the file
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// is read.
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//
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// The function fn may be called multiple times during the same Load invocation
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// and therefore must be idempotent.
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//
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// Implementations are encouraged to use backend.DefaultLoad
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Load(ctx context.Context, h Handle, length int, offset int64, fn func(rd io.Reader) error) error
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// Stat returns information about the File identified by h.
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Stat(ctx context.Context, h Handle) (FileInfo, error)
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// List runs fn for each file in the backend which has the type t. When an
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// error occurs (or fn returns an error), List stops and returns it.
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//
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// The function fn is called exactly once for each file during successful
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// execution and at most once in case of an error.
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//
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// The function fn is called in the same Goroutine that List() is called
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// from.
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List(ctx context.Context, t FileType, fn func(FileInfo) error) error
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// IsNotExist returns true if the error was caused by a non-existing file
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// in the backend.
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IsNotExist(err error) bool
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// Delete removes all data in the backend.
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Delete(ctx context.Context) error
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}
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// FileInfo is contains information about a file in the backend.
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type FileInfo struct {
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Size int64
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Name string
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}
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