syncthing/lib/versioner/versioner.go

84 lines
2.3 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// Package versioner implements common interfaces for file versioning and a
// simple default versioning scheme.
package versioner
import (
"context"
"errors"
"fmt"
"time"
"github.com/syncthing/syncthing/lib/config"
)
type Versioner interface {
Archive(filePath string) error
GetVersions() (map[string][]FileVersion, error)
Restore(filePath string, versionTime time.Time) error
Clean(context.Context) error
}
type FileVersion struct {
VersionTime time.Time `json:"versionTime"`
ModTime time.Time `json:"modTime"`
Size int64 `json:"size"`
}
type factory func(cfg config.FolderConfiguration) Versioner
var factories = make(map[string]factory)
var ErrRestorationNotSupported = errors.New("version restoration not supported with the current versioner")
const (
TimeFormat = "20060102-150405"
timeGlob = "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]" // glob pattern matching TimeFormat
)
func New(cfg config.FolderConfiguration) (Versioner, error) {
fac, ok := factories[cfg.Versioning.Type]
if !ok {
return nil, fmt.Errorf("requested versioning type %q does not exist", cfg.Type)
}
return &versionerWithErrorContext{
Versioner: fac(cfg),
vtype: cfg.Versioning.Type,
}, nil
}
type versionerWithErrorContext struct {
Versioner
vtype string
}
func (v *versionerWithErrorContext) wrapError(err error, op string) error {
if err != nil {
return fmt.Errorf("%s versioner: %v: %w", v.vtype, op, err)
}
return nil
}
func (v *versionerWithErrorContext) Archive(filePath string) error {
return v.wrapError(v.Versioner.Archive(filePath), "archive")
}
func (v *versionerWithErrorContext) GetVersions() (map[string][]FileVersion, error) {
versions, err := v.Versioner.GetVersions()
return versions, v.wrapError(err, "get versions")
}
func (v *versionerWithErrorContext) Restore(filePath string, versionTime time.Time) error {
return v.wrapError(v.Versioner.Restore(filePath, versionTime), "restore")
}
func (v *versionerWithErrorContext) Clean(ctx context.Context) error {
return v.wrapError(v.Versioner.Clean(ctx), "clean")
}