wip

cmd/cli/commands/add/add.go

@@ -1,20 +1,19 @@
 package add
 
 import (
-	"cloudsave/pkg/remote"
+	"cloudsave/pkg/data"
-	"cloudsave/pkg/repository"
 	"context"
 	"flag"
 	"fmt"
 	"os"
 	"path/filepath"
-	"strings"
 
 	"github.com/google/subcommands"
 )
 
 type (
 	AddCmd struct {
+		Service *data.Service
 		name    string
 		remote  string
 	}
@@ -51,17 +50,16 @@ func (p *AddCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) s
 		p.name = filepath.Base(path)
 	}
 
-	m, err := repository.Add(p.name, path)
+	gameID, err := p.Service.Add(p.name, path, p.remote)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, "error: failed to add game reference:", err)
+		fmt.Fprintln(os.Stderr, "error: failed to add this gamesave to the datastore:", err)
 		return subcommands.ExitFailure
 	}
 
-	if len(strings.TrimSpace(p.remote)) > 0 {
+	if err := p.Service.Scan(gameID); err != nil {
-		remote.Set(m.ID, p.remote)
+		fmt.Fprintln(os.Stderr, "error: failed to scan:", err)
+		return subcommands.ExitFailure
 	}
 
-	fmt.Println(m.ID)
-
 	return subcommands.ExitSuccess
 }

cmd/cli/commands/apply/apply.go

@@ -1,13 +1,10 @@
 package apply
 
 import (
-	"cloudsave/pkg/repository"
-	"cloudsave/pkg/tools/archive"
 	"context"
 	"flag"
 	"fmt"
 	"os"
-	"path/filepath"
 
 	"github.com/google/subcommands"
 )
@@ -35,36 +32,10 @@ func (p *ListCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 		return subcommands.ExitUsageError
 	}
 
-	gameID := f.Arg(0)
+	//gameID := f.Arg(0)
-	uuid := f.Arg(1)
+	//uuid := f.Arg(1)
 
-	g, err := repository.One(gameID)
+	panic("not implemented")
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "error: failed to open game metadata: %s\n", err)
-		return subcommands.ExitFailure
-	}
-
-	if err := repository.RestoreArchive(gameID, uuid); err != nil {
-		fmt.Fprintf(os.Stderr, "error: failed to restore backup: %s\n", err)
-		return subcommands.ExitFailure
-	}
-
-	if err := os.RemoveAll(g.Path); err != nil {
-		fmt.Fprintf(os.Stderr, "error: failed to remove old data: %s\n", err)
-		return subcommands.ExitFailure
-	}
-
-	file, err := os.OpenFile(filepath.Join(repository.DatastorePath(), gameID, "data.tar.gz"), os.O_RDONLY, 0)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "error: failed to open archive: %s\n", err)
-		return subcommands.ExitFailure
-	}
-	defer file.Close()
-
-	if err := archive.Untar(file, g.Path); err != nil {
-		fmt.Fprintf(os.Stderr, "error: failed to extract archive: %s\n", err)
-		return subcommands.ExitFailure
-	}
 
 	return subcommands.ExitSuccess
 }

cmd/cli/commands/list/list.go

@@ -2,8 +2,8 @@ package list
 
 import (
 	"cloudsave/cmd/cli/tools/prompt/credentials"
+	"cloudsave/pkg/data"
 	"cloudsave/pkg/remote/client"
-	"cloudsave/pkg/repository"
 	"context"
 	"flag"
 	"fmt"
@@ -14,6 +14,7 @@ import (
 
 type (
 	ListCmd struct {
+		Service *data.Service
 		remote  bool
 		backup  bool
 	}
@@ -44,25 +45,25 @@ func (p *ListCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 
 		username, password, err := credentials.Read()
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "failed to read std output: %s", err)
+			fmt.Fprintf(os.Stderr, "error: failed to read std output: %s", err)
 			return subcommands.ExitFailure
 		}
 
-		if err := remote(f.Arg(0), username, password, p.backup); err != nil {
+		if err := p.server(f.Arg(0), username, password, p.backup); err != nil {
 			fmt.Fprintln(os.Stderr, "error:", err)
 			return subcommands.ExitFailure
 		}
 		return subcommands.ExitSuccess
 	}
-	if err := local(p.backup); err != nil {
+	if err := p.local(p.backup); err != nil {
 		fmt.Fprintln(os.Stderr, "error:", err)
 		return subcommands.ExitFailure
 	}
 	return subcommands.ExitSuccess
 }
 
-func local(includeBackup bool) error {
+func (p *ListCmd) local(includeBackup bool) error {
-	games, err := repository.All()
+	games, err := p.Service.AllGames()
 	if err != nil {
 		return fmt.Errorf("failed to load datastore: %w", err)
 	}
@@ -72,7 +73,7 @@ func local(includeBackup bool) error {
 		fmt.Println("Name:", g.Name)
 		fmt.Println("Last Version:", g.Date, "( Version Number", g.Version, ")")
 		if includeBackup {
-			bk, err := repository.Archives(g.ID)
+			bk, err := p.Service.AllBackups(g.ID)
 			if err != nil {
 				return fmt.Errorf("failed to list backup files: %w", err)
 			}
@@ -89,7 +90,7 @@ func local(includeBackup bool) error {
 	return nil
 }
 
-func remote(url, username, password string, includeBackup bool) error {
+func (p *ListCmd) server(url, username, password string, includeBackup bool) error {
 	cli := client.New(url, username, password)
 
 	if err := cli.Ping(); err != nil {

cmd/cli/commands/pull/pull.go

@@ -2,20 +2,19 @@ package pull
 
 import (
 	"cloudsave/cmd/cli/tools/prompt/credentials"
+	"cloudsave/pkg/data"
 	"cloudsave/pkg/remote/client"
-	"cloudsave/pkg/repository"
-	"cloudsave/pkg/tools/archive"
 	"context"
 	"flag"
 	"fmt"
 	"os"
-	"path/filepath"
 
 	"github.com/google/subcommands"
 )
 
 type (
 	PullCmd struct {
+		Service *data.Service
 	}
 )
 
@@ -44,45 +43,33 @@ func (p *PullCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 
 	username, password, err := credentials.Read()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "failed to read std output: %s", err)
+		fmt.Fprintf(os.Stderr, "error: failed to read std output: %s", err)
 		return subcommands.ExitFailure
 	}
 
 	cli := client.New(url, username, password)
 
 	if err := cli.Ping(); err != nil {
-		fmt.Fprintf(os.Stderr, "failed to connect to the remote: %s", err)
+		fmt.Fprintf(os.Stderr, "error: failed to connect to the remote: %s", err)
 		return subcommands.ExitFailure
 	}
 
-	archivePath := filepath.Join(repository.DatastorePath(), gameID, "data.tar.gz")
+	if err := p.Service.PullCurrent(gameID, path, cli); err != nil {
+		fmt.Fprintf(os.Stderr, "error: failed to pull current archive: %s", err)
+		return subcommands.ExitFailure
+	}
 
-	m, err := cli.Metadata(gameID)
+	ids, err := cli.ListArchives(gameID)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "failed to get metadata: %s", err)
+		fmt.Fprintf(os.Stderr, "error: failed to list backup archive: %s", err)
 		return subcommands.ExitFailure
 	}
 
-	err = repository.Register(m, path)
+	for _, id := range ids {
-	if err != nil {
+		if err := p.Service.PullBackup(gameID, id, cli); err != nil {
-		fmt.Fprintf(os.Stderr, "failed to register local metadata: %s", err)
+			fmt.Fprintf(os.Stderr, "error: failed to pull backup archive %s: %s", id, err)
 			return subcommands.ExitFailure
 		}
-
-	if err := cli.Pull(gameID, archivePath); err != nil {
-		fmt.Fprintf(os.Stderr, "failed to pull from the remote: %s", err)
-		return subcommands.ExitFailure
-	}
-
-	fi, err := os.OpenFile(archivePath, os.O_RDONLY, 0)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "failed to open archive: %s", err)
-		return subcommands.ExitFailure
-	}
-
-	if err := archive.Untar(fi, path); err != nil {
-		fmt.Fprintf(os.Stderr, "failed to unarchive file: %s", err)
-		return subcommands.ExitFailure
 	}
 
 	return subcommands.ExitSuccess

cmd/cli/commands/remote/remote.go

@@ -1,9 +1,9 @@
 package remote
 
 import (
+	"cloudsave/pkg/data"
 	"cloudsave/pkg/remote"
 	"cloudsave/pkg/remote/client"
-	"cloudsave/pkg/repository"
 	"context"
 	"flag"
 	"fmt"
@@ -14,6 +14,7 @@ import (
 
 type (
 	RemoteCmd struct {
+		Service *data.Service
 		set     bool
 		list    bool
 	}
@@ -43,7 +44,7 @@ func (p *RemoteCmd) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface
 	switch {
 	case p.list:
 		{
-			if err := list(); err != nil {
+			if err := p.print(); err != nil {
 				fmt.Fprintln(os.Stderr, "error:", err)
 				return subcommands.ExitFailure
 			}
@@ -68,8 +69,8 @@ func (p *RemoteCmd) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface
 	return subcommands.ExitSuccess
 }
 
-func list() error {
+func (p *RemoteCmd) print() error {
-	games, err := repository.All()
+	games, err := p.Service.AllGames()
 	if err != nil {
 		return fmt.Errorf("failed to load datastore: %w", err)
 	}

cmd/cli/commands/remove/remove.go

@@ -1,7 +1,7 @@
 package remove
 
 import (
-	"cloudsave/pkg/repository"
+	"cloudsave/pkg/data"
 	"context"
 	"flag"
 	"fmt"
@@ -11,7 +11,9 @@ import (
 )
 
 type (
-	RemoveCmd struct{}
+	RemoveCmd struct {
+		Service *data.Service
+	}
 )
 
 func (*RemoveCmd) Name() string     { return "remove" }
@@ -33,7 +35,7 @@ func (p *RemoveCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}
 		return subcommands.ExitUsageError
 	}
 
-	err := repository.Remove(f.Arg(0))
+	err := p.Service.RemoveGame(f.Arg(0))
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "error: failed to unregister the game:", err)
 		return subcommands.ExitFailure

cmd/cli/commands/run/run.go

@@ -1,22 +1,18 @@
 package run
 
 import (
-	"cloudsave/pkg/repository"
+	"cloudsave/pkg/data"
-	"cloudsave/pkg/tools/archive"
 	"context"
 	"flag"
 	"fmt"
-	"io"
 	"os"
-	"path/filepath"
-	"time"
 
 	"github.com/google/subcommands"
-	"github.com/schollz/progressbar/v3"
 )
 
 type (
 	RunCmd struct {
+		Service *data.Service
 	}
 )
 
@@ -34,26 +30,15 @@ and a new archive is created with a new version number.
 func (p *RunCmd) SetFlags(f *flag.FlagSet) {}
 
 func (p *RunCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	datastore, err := repository.All()
+	datastore, err := p.Service.AllGames()
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "error: failed to load datastore:", err)
 		return subcommands.ExitFailure
 	}
 
 	for _, metadata := range datastore {
-		metadataPath := filepath.Join(repository.DatastorePath(), metadata.ID)
+		if err := p.Service.Scan(metadata.ID); err != nil {
-		//todo transaction
+			fmt.Fprintln(os.Stderr, "error: failed to scan:", err)
-		err := archiveIfChanged(metadata.ID, metadata.Path, filepath.Join(metadataPath, "data.tar.gz"), filepath.Join(metadataPath, ".last_run"))
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "error: cannot process the data of %s: %s\n", metadata.ID, err)
-			return subcommands.ExitFailure
-		}
-		if err := repository.SetVersion(metadata.ID, metadata.Version+1); err != nil {
-			fmt.Fprintf(os.Stderr, "error: cannot process the data of %s: %s\n", metadata.ID, err)
-			return subcommands.ExitFailure
-		}
-		if err := repository.SetDate(metadata.ID, time.Now()); err != nil {
-			fmt.Fprintf(os.Stderr, "error: cannot process the data of %s: %s\n", metadata.ID, err)
 			return subcommands.ExitFailure
 		}
 		fmt.Println("✅", metadata.Name)
@@ -62,78 +47,3 @@ func (p *RunCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) s
 	fmt.Println("done.")
 	return subcommands.ExitSuccess
 }
-
-// archiveIfChanged will archive srcDir into destTarGz only if any file
-// in srcDir has a modification time > the last run time stored in stateFile.
-// After archiving, it updates stateFile to the current time.
-func archiveIfChanged(gameID, srcDir, destTarGz, stateFile string) error {
-	pg := progressbar.New(-1)
-	destroyPg := func() {
-		pg.Finish()
-		pg.Clear()
-		pg.Close()
-
-	}
-	defer destroyPg()
-
-	pg.Describe("Scanning " + gameID + "...")
-
-	// load last run time
-	var lastRun time.Time
-	data, err := os.ReadFile(stateFile)
-	if err != nil && !os.IsNotExist(err) {
-		return fmt.Errorf("failed to reading state file: %w", err)
-	}
-	if err == nil {
-		lastRun, err = time.Parse(time.RFC3339, string(data))
-		if err != nil {
-			return fmt.Errorf("parsing state file timestamp: %w", err)
-		}
-	}
-
-	// check for changes
-	changed := false
-	err = filepath.Walk(srcDir, func(path string, info os.FileInfo, walkErr error) error {
-		if walkErr != nil {
-			return walkErr
-		}
-		if info.ModTime().After(lastRun) {
-			changed = true
-			return io.EOF // early exit
-		}
-		return nil
-	})
-	if err != nil && err != io.EOF {
-		return fmt.Errorf("failed to scanning source directory: %w", err)
-	}
-
-	if !changed {
-		pg.Finish()
-		return nil
-	}
-
-	// make a backup
-	pg.Describe("Backup current data...")
-	if err := repository.MakeArchive(gameID); err != nil {
-		return fmt.Errorf("failed to archive data: %w", err)
-	}
-
-	// create archive
-	pg.Describe("Archiving new data...")
-	f, err := os.Create(destTarGz)
-	if err != nil {
-		return fmt.Errorf("failed to creating archive file: %w", err)
-	}
-	defer f.Close()
-
-	if err := archive.Tar(f, srcDir); err != nil {
-		return fmt.Errorf("failed archiving files: %w", err)
-	}
-
-	now := time.Now().UTC().Format(time.RFC3339)
-	if err := os.WriteFile(stateFile, []byte(now), 0644); err != nil {
-		return fmt.Errorf("updating state file: %w", err)
-	}
-
-	return nil
-}

cmd/cli/commands/sync/sync.go

@@ -3,6 +3,7 @@ package sync
 import (
 	"cloudsave/cmd/cli/tools/prompt"
 	"cloudsave/cmd/cli/tools/prompt/credentials"
+	"cloudsave/pkg/data"
 	"cloudsave/pkg/remote"
 	"cloudsave/pkg/remote/client"
 	"cloudsave/pkg/repository"
@@ -12,7 +13,6 @@ import (
 	"fmt"
 	"log/slog"
 	"os"
-	"path/filepath"
 	"time"
 
 	"github.com/google/subcommands"
@@ -21,6 +21,7 @@ import (
 
 type (
 	SyncCmd struct {
+		Service *data.Service
 	}
 )
 
@@ -37,7 +38,7 @@ func (p *SyncCmd) SetFlags(f *flag.FlagSet) {
 }
 
 func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	games, err := repository.All()
+	games, err := p.Service.AllGames()
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "error: failed to load datastore:", err)
 		return subcommands.ExitFailure
@@ -92,12 +93,6 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 		}
 
 		pg.Describe(fmt.Sprintf("[%s] Fetching metadata...", g.Name))
-		hlocal, err := repository.Hash(r.GameID)
-		if err != nil {
-			destroyPg()
-			slog.Error(err.Error())
-			continue
-		}
 
 		hremote, err := cli.Hash(r.GameID)
 		if err != nil {
@@ -106,13 +101,6 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 			continue
 		}
 
-		vlocal, err := repository.Version(r.GameID)
-		if err != nil {
-			destroyPg()
-			slog.Error(err.Error())
-			continue
-		}
-
 		remoteMetadata, err := cli.Metadata(r.GameID)
 		if err != nil {
 			destroyPg()
@@ -130,11 +118,11 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 			slog.Warn("failed to push backup files", "err", err)
 		}
 
-		if hlocal == hremote {
+		if g.MD5 == hremote {
 			destroyPg()
-			if vlocal != remoteMetadata.Version {
+			if g.Version != remoteMetadata.Version {
 				slog.Debug("version is not the same, but the hash is equal. Updating local database")
-				if err := repository.SetVersion(r.GameID, remoteMetadata.Version); err != nil {
+				if err := p.Service.SetVersion(r.GameID, remoteMetadata.Version); err != nil {
 					fmt.Fprintln(os.Stderr, "error: failed to synchronize version number:", err)
 					continue
 				}
@@ -143,7 +131,7 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 			continue
 		}
 
-		if vlocal > remoteMetadata.Version {
+		if g.Version > remoteMetadata.Version {
 			pg.Describe(fmt.Sprintf("[%s] Pushing data...", g.Name))
 			if err := push(g, cli); err != nil {
 				destroyPg()
@@ -155,22 +143,21 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 			continue
 		}
 
-		if vlocal < remoteMetadata.Version {
+		if g.Version < remoteMetadata.Version {
 			destroyPg()
 			if err := pull(r.GameID, cli); err != nil {
 				destroyPg()
 				fmt.Fprintln(os.Stderr, "failed to push:", err)
 				return subcommands.ExitFailure
 			}
-			if err := repository.SetVersion(r.GameID, remoteMetadata.Version); err != nil {
+
+			g.Version = remoteMetadata.Version
+			g.Date = remoteMetadata.Date
+
+			if err := p.Service.UpdateMetadata(g.ID, g); err != nil {
 				destroyPg()
-				fmt.Fprintln(os.Stderr, "error: failed to synchronize version number:", err)
+				fmt.Fprintln(os.Stderr, "failed to push:", err)
-				continue
+				return subcommands.ExitFailure
-			}
-			if err := repository.SetDate(r.GameID, remoteMetadata.Date); err != nil {
-				destroyPg()
-				fmt.Fprintln(os.Stderr, "error: failed to synchronize date:", err)
-				continue
 			}
 			fmt.Println(g.Name + ": pulled")
 			continue
@@ -178,8 +165,8 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 
 		destroyPg()
 
-		if vlocal == remoteMetadata.Version {
+		if g.Version == remoteMetadata.Version {
-			if err := conflict(r.GameID, g, remoteMetadata, cli); err != nil {
+			if err := p.conflict(r.GameID, g, remoteMetadata, cli); err != nil {
 				fmt.Fprintln(os.Stderr, "error: failed to resolve conflict:", err)
 				continue
 			}
@@ -191,8 +178,8 @@ func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 	return subcommands.ExitSuccess
 }
 
-func conflict(gameID string, m, remoteMetadata repository.Metadata, cli *client.Client) error {
+func (p *SyncCmd) conflict(gameID string, m, remoteMetadata repository.Metadata, cli *client.Client) error {
-	g, err := repository.One(gameID)
+	g, err := p.Service.One(gameID)
 	if err != nil {
 		slog.Warn("a conflict was found but the game is not found in the database")
 		slog.Debug("debug info", "gameID", gameID)
@@ -211,35 +198,33 @@ func conflict(gameID string, m, remoteMetadata repository.Metadata, cli *client.
 	switch res {
 	case prompt.My:
 		{
-			if err := push(m, cli); err != nil {
+			if err := p.push(m, cli); err != nil {
 				return fmt.Errorf("failed to push: %w", err)
 			}
 		}
 
 	case prompt.Their:
 		{
-			if err := pull(gameID, cli); err != nil {
+			if err := p.pull(gameID, cli); err != nil {
 				return fmt.Errorf("failed to push: %w", err)
 			}
-			if err := repository.SetVersion(gameID, remoteMetadata.Version); err != nil {
+			g.Version = remoteMetadata.Version
-				return fmt.Errorf("failed to synchronize version number: %w", err)
+			g.Date = remoteMetadata.Date
-			}
+
-			if err := repository.SetDate(gameID, remoteMetadata.Date); err != nil {
+			if err := p.Service.UpdateMetadata(g.ID, g); err != nil {
-				return fmt.Errorf("failed to synchronize date: %w", err)
+				return fmt.Errorf("failed to push: %w", err)
 			}
 		}
 	}
 	return nil
 }
 
-func push(m repository.Metadata, cli *client.Client) error {
+func (p *SyncCmd) push(m repository.Metadata, cli *client.Client) error {
-	archivePath := filepath.Join(repository.DatastorePath(), m.ID, "data.tar.gz")
 	
-	return cli.PushSave(archivePath, m)
 }
 
-func pushBackup(m repository.Metadata, cli *client.Client) error {
+func (p *SyncCmd) pushBackup(m repository.Metadata, cli *client.Client) error {
-	bs, err := repository.Archives(m.ID)
+	bs, err := p.Service.AllBackups(m.ID)
 	if err != nil {
 		return err
 	}
@@ -262,7 +247,7 @@ func pushBackup(m repository.Metadata, cli *client.Client) error {
 	return nil
 }
 
-func pullBackup(m repository.Metadata, cli *client.Client) error {
+func (p *SyncCmd) pullBackup(m repository.Metadata, cli *client.Client) error {
 	bs, err := cli.ListArchives(m.ID)
 	if err != nil {
 		return err
@@ -274,20 +259,13 @@ func pullBackup(m repository.Metadata, cli *client.Client) error {
 			return err
 		}
 
-		linfo, err := repository.Archive(m.ID, uuid)
+		linfo, err := p.Service.Backup(m.ID, uuid)
 		if err != nil {
-			if !errors.Is(err, os.ErrNotExist) {
-				return err
-			}
-		}
-
-		path := filepath.Join(repository.DatastorePath(), m.ID, "hist", uuid)
-		if err := os.MkdirAll(path, 0740); err != nil {
 			return err
 		}
 
-		if rinfo.MD5 != linfo.MD5 {
+		if linfo != rinfo {
-			if err := cli.PullBackup(m.ID, uuid, filepath.Join(path, "data.tar.gz")); err != nil {
+			if err := p.Service.PullBackup(m.ID, uuid, cli); err != nil {
 				return err
 			}
 		}
@@ -295,10 +273,8 @@ func pullBackup(m repository.Metadata, cli *client.Client) error {
 	return nil
 }
 
-func pull(gameID string, cli *client.Client) error {
+func (p *SyncCmd) pull(gameID string, cli *client.Client) error {
-	archivePath := filepath.Join(repository.DatastorePath(), gameID, "data.tar.gz")
+	return p.Service.PullArchive(gameID, "", cli)
-
-	return cli.Pull(gameID, archivePath)
 }
 
 func connect(remoteCred map[string]map[string]string, r remote.Remote) (*client.Client, error) {

cmd/cli/main.go

@@ -9,27 +9,48 @@ import (
 	"cloudsave/cmd/cli/commands/run"
 	"cloudsave/cmd/cli/commands/sync"
 	"cloudsave/cmd/cli/commands/version"
+	"cloudsave/pkg/data"
+	"cloudsave/pkg/repository"
 	"context"
 	"flag"
 	"os"
+	"path/filepath"
 
 	"github.com/google/subcommands"
 )
 
 func main() {
+	roaming, err := os.UserConfigDir()
+	if err != nil {
+		panic("failed to get user config path: " + err.Error())
+	}
+
+	datastorepath := filepath.Join(roaming, "cloudsave", "data")
+	err = os.MkdirAll(datastorepath, 0740)
+	if err != nil {
+		panic("cannot make the datastore:" + err.Error())
+	}
+
+	repo, err := repository.NewLazyRepository(datastorepath)
+	if err != nil {
+		panic("cannot make the datastore:" + err.Error())
+	}
+
+	s := data.NewService(repo)
+
 	subcommands.Register(subcommands.HelpCommand(), "help")
 	subcommands.Register(subcommands.FlagsCommand(), "help")
 	subcommands.Register(subcommands.CommandsCommand(), "help")
 	subcommands.Register(&version.VersionCmd{}, "help")
 
-	subcommands.Register(&add.AddCmd{}, "management")
+	subcommands.Register(&add.AddCmd{Service: s}, "management")
-	subcommands.Register(&run.RunCmd{}, "management")
+	subcommands.Register(&run.RunCmd{Service: s}, "management")
-	subcommands.Register(&list.ListCmd{}, "management")
+	subcommands.Register(&list.ListCmd{Service: s}, "management")
-	subcommands.Register(&remove.RemoveCmd{}, "management")
+	subcommands.Register(&remove.RemoveCmd{Service: s}, "management")
 
-	subcommands.Register(&remote.RemoteCmd{}, "remote")
+	subcommands.Register(&remote.RemoteCmd{Service: s}, "remote")
-	subcommands.Register(&sync.SyncCmd{}, "remote")
+	subcommands.Register(&sync.SyncCmd{Service: s}, "remote")
-	subcommands.Register(&pull.PullCmd{}, "remote")
+	subcommands.Register(&pull.PullCmd{Service: s}, "remote")
 
 	flag.Parse()
 	ctx := context.Background()

cmd/server/api/api.go

@@ -1,7 +1,6 @@
 package api
 
 import (
-	"cloudsave/cmd/server/data"
 	"cloudsave/pkg/repository"
 	"encoding/json"
 	"errors"

cmd/server/data/data.go

@@ -1,243 +0,0 @@
-package data
-
-import (
-	"cloudsave/pkg/repository"
-	"cloudsave/pkg/tools/hash"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io"
-	"os"
-	"path/filepath"
-	"sync"
-)
-
-type (
-	cache map[string]cachedInfo
-
-	cachedInfo struct {
-		MD5     string
-		Version int
-	}
-)
-
-var (
-	ErrBackupNotExists error = errors.New("backup not found")
-	ErrNotExists       error = errors.New("not found")
-
-	// singleton
-	hashCacheMu sync.RWMutex
-	hashCache   cache = make(map[string]cachedInfo)
-)
-
-func (c cache) Get(gameID string) (cachedInfo, bool) {
-	hashCacheMu.RLock()
-	defer hashCacheMu.RUnlock()
-
-	if v, ok := c[gameID]; ok {
-		return v, true
-	}
-	return cachedInfo{}, false
-}
-
-func (c cache) Register(gameID string, v cachedInfo) {
-	hashCacheMu.Lock()
-	defer hashCacheMu.Unlock()
-
-	c[gameID] = v
-}
-
-func (c cache) Remove(gameID string) {
-	hashCacheMu.Lock()
-	defer hashCacheMu.Unlock()
-
-	delete(c, gameID)
-}
-
-func Write(gameID, documentRoot string, r io.Reader) error {
-	dataFolderPath := filepath.Join(documentRoot, "data", gameID)
-	partPath := filepath.Join(dataFolderPath, "data.tar.gz.part")
-	finalFilePath := filepath.Join(dataFolderPath, "data.tar.gz")
-
-	if err := makeDataFolder(gameID, documentRoot); err != nil {
-		return err
-	}
-
-	f, err := os.OpenFile(partPath, os.O_CREATE|os.O_WRONLY, 0740)
-	if err != nil {
-		return err
-	}
-
-	if _, err := io.Copy(f, r); err != nil {
-		f.Close()
-		if err := os.Remove(partPath); err != nil {
-			return fmt.Errorf("failed to write the file and cannot clean the folder: %w", err)
-		}
-		return fmt.Errorf("failed to write the file: %w", err)
-	}
-	f.Close()
-
-	if err := os.Rename(partPath, finalFilePath); err != nil {
-		return err
-	}
-
-	hashCache.Remove(gameID)
-	return nil
-}
-
-func WriteHist(gameID, documentRoot, uuid string, r io.Reader) error {
-	dataFolderPath := filepath.Join(documentRoot, "data", gameID, "hist", uuid)
-	partPath := filepath.Join(dataFolderPath, "data.tar.gz.part")
-	finalFilePath := filepath.Join(dataFolderPath, "data.tar.gz")
-
-	if err := makeDataFolder(gameID, documentRoot); err != nil {
-		return err
-	}
-
-	if err := os.MkdirAll(dataFolderPath, 0740); err != nil {
-		return err
-	}
-
-	f, err := os.OpenFile(partPath, os.O_CREATE|os.O_WRONLY, 0740)
-	if err != nil {
-		return err
-	}
-
-	if _, err := io.Copy(f, r); err != nil {
-		f.Close()
-		if err := os.Remove(partPath); err != nil {
-			return fmt.Errorf("failed to write the file and cannot clean the folder: %w", err)
-		}
-		return fmt.Errorf("failed to write the file: %w", err)
-	}
-	f.Close()
-
-	if err := os.Rename(partPath, finalFilePath); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func UpdateMetadata(gameID, documentRoot string, m repository.Metadata) error {
-	if err := makeDataFolder(gameID, documentRoot); err != nil {
-		return err
-	}
-	path := filepath.Join(documentRoot, "data", gameID, "metadata.json")
-
-	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0740)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	e := json.NewEncoder(f)
-	return e.Encode(m)
-}
-
-func ArchiveInfo(gameID, documentRoot, uuid string) (repository.Backup, error) {
-	dataFolderPath := filepath.Join(documentRoot, "data", gameID, "hist", uuid, "data.tar.gz")
-	cacheID := gameID + ":" + uuid
-
-	finfo, err := os.Stat(dataFolderPath)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return repository.Backup{}, ErrBackupNotExists
-		}
-		return repository.Backup{}, err
-	}
-
-	if m, ok := hashCache.Get(cacheID); ok {
-		return repository.Backup{
-			CreatedAt: finfo.ModTime(),
-			UUID:      uuid,
-			MD5:       m.MD5,
-		}, nil
-	}
-
-	h, err := hash.FileMD5(dataFolderPath)
-	if err != nil {
-		return repository.Backup{}, fmt.Errorf("failed to calculate file md5: %w", err)
-	}
-
-	hashCache.Register(cacheID, cachedInfo{
-		MD5: h,
-	})
-
-	return repository.Backup{
-		CreatedAt: finfo.ModTime(),
-		UUID:      uuid,
-		MD5:       h,
-	}, nil
-}
-
-func Hash(gameID, documentRoot string) (string, error) {
-	path := filepath.Clean(filepath.Join(documentRoot, "data", gameID))
-
-	sdir, err := os.Stat(path)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return "", ErrNotExists
-		}
-		return "", err
-	}
-
-	if !sdir.IsDir() {
-		return "", err
-	}
-
-	v, err := getVersion(gameID, documentRoot)
-	if err != nil {
-		return "", fmt.Errorf("failed to read game metadata: %w", err)
-	}
-
-	if m, ok := hashCache.Get(gameID); ok {
-		if v == m.Version {
-			return m.MD5, nil
-		}
-	}
-
-	path = filepath.Join(path, "data.tar.gz")
-
-	h, err := hash.FileMD5(path)
-	if err != nil {
-		return "", err
-	}
-
-	hashCache.Register(gameID, cachedInfo{
-		Version: v,
-		MD5:     h,
-	})
-
-	return h, nil
-}
-
-func getVersion(gameID, documentRoot string) (int, error) {
-	path := filepath.Join(documentRoot, "data", gameID, "metadata.json")
-
-	f, err := os.OpenFile(path, os.O_RDONLY, 0)
-	if err != nil {
-		return 0, err
-	}
-	defer f.Close()
-
-	d := json.NewDecoder(f)
-	var m repository.Metadata
-	if err := d.Decode(&m); err != nil {
-		return 0, err
-	}
-
-	return m.Version, nil
-}
-
-func makeDataFolder(gameID, documentRoot string) error {
-	if err := os.MkdirAll(filepath.Join(documentRoot, "data", gameID), 0740); err != nil {
-		return err
-	}
-
-	if err := os.MkdirAll(filepath.Join(documentRoot, "data", gameID, "hist"), 0740); err != nil {
-		return err
-	}
-
-	return nil
-}

pkg/data/data.go

@@ -0,0 +1,253 @@
+package data
+
+import (
+	"cloudsave/pkg/remote/client"
+	"cloudsave/pkg/repository"
+	"cloudsave/pkg/tools/archive"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type (
+	Service struct {
+		repo repository.Repository
+	}
+)
+
+func NewService(repo repository.Repository) *Service {
+	return &Service{
+		repo: repo,
+	}
+}
+
+func (s *Service) Add(name, path, remote string) (string, error) {
+	gameID := repository.NewGameIdentifier(uuid.NewString())
+
+	if err := s.repo.Mkdir(gameID); err != nil {
+		return "", fmt.Errorf("failed to add game reference: %w", err)
+	}
+
+	m := repository.Metadata{
+		ID:      gameID.Key(),
+		Name:    name,
+		Path:    path,
+		Version: 1,
+		Date:    time.Now(),
+	}
+
+	if err := s.repo.WriteMetadata(gameID, m); err != nil {
+		return "", fmt.Errorf("failed to add game reference: %w", err)
+	}
+
+	return gameID.Key(), nil
+}
+
+func (s *Service) One(gameID string) (repository.Metadata, error) {
+	id := repository.NewGameIdentifier(gameID)
+
+	m, err := s.repo.Metadata(id)
+	if err != nil {
+		return repository.Metadata{}, fmt.Errorf("failed to get metadata: %w", err)
+	}
+
+	return m, nil
+}
+
+func (s *Service) Backup(gameID, backupID string) (repository.Backup, error) {
+	id := repository.NewBackupIdentifier(gameID, backupID)
+
+	return s.repo.Backup(id)
+}
+
+func (s *Service) UpdateMetadata(gameID string, m repository.Metadata) error {
+	id := repository.NewGameIdentifier(gameID)
+
+	if err := s.repo.WriteMetadata(id, m); err != nil {
+		return fmt.Errorf("failed to write metadate: %w", err)
+	}
+
+	return nil
+}
+
+func (s *Service) Scan(gameID string) error {
+	id := repository.NewGameIdentifier(gameID)
+
+	lastRun, err := s.repo.LastScan(id)
+	if err != nil {
+		return fmt.Errorf("failed to get last scan time: %w", err)
+	}
+
+	m, err := s.repo.Metadata(id)
+	if err != nil {
+		return fmt.Errorf("failed to get game metadata: %w", err)
+	}
+
+	if !IsDirectoryChanged(m.Path, lastRun) {
+		return nil
+	}
+
+	f, err := s.repo.WriteBlob(id)
+	if err != nil {
+		return fmt.Errorf("failed to get datastore stream: %w", err)
+	}
+	if v, ok := f.(io.Closer); ok {
+		defer v.Close()
+	}
+
+	if err := archive.Tar(f, m.Path); err != nil {
+		return fmt.Errorf("failed to make archive: %w", err)
+	}
+
+	if err := s.repo.ResetLastScan(id); err != nil {
+		return fmt.Errorf("failed to reset scan date: %w", err)
+	}
+
+	m.Date = time.Now()
+	m.Version += 1
+
+	if err := s.repo.WriteMetadata(id, m); err != nil {
+		return fmt.Errorf("failed to update metadata: %w", err)
+	}
+
+	return nil
+}
+
+func (s *Service) AllGames() ([]repository.Metadata, error) {
+	ids, err := s.repo.All()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get the list of ids: %w", err)
+	}
+
+	var ms []repository.Metadata
+	for _, id := range ids {
+		m, err := s.repo.Metadata(repository.NewGameIdentifier(id))
+		if err != nil {
+			return nil, fmt.Errorf("failed to open metadata: %w", err)
+		}
+		ms = append(ms, m)
+	}
+
+	return ms, nil
+}
+
+func (s *Service) AllBackups(gameID string) ([]repository.Backup, error) {
+	ids, err := s.repo.AllHist(repository.NewGameIdentifier(gameID))
+	if err != nil {
+		return nil, fmt.Errorf("failed to get the list of ids: %w", err)
+	}
+
+	var bs []repository.Backup
+	for _, id := range ids {
+		b, err := s.repo.Backup(repository.NewBackupIdentifier(gameID, id))
+		if err != nil {
+			return nil, fmt.Errorf("failed to open metadata: %w", err)
+		}
+		bs = append(bs, b)
+	}
+
+	return bs, nil
+}
+
+func (l Service) PullArchive(gameID, backupID string, cli *client.Client) error {
+	if len(backupID) > 0 {
+		path := l.repo.DataPath(repository.NewBackupIdentifier(gameID, backupID))
+		return cli.PullBackup(gameID, backupID, filepath.Join(path, "data.tar.gz"))
+	}
+
+	path := l.repo.DataPath(repository.NewGameIdentifier(gameID))
+	return cli.Pull(gameID, filepath.Join(path, "data.tar.gz"))
+}
+
+func (l Service) PullCurrent(id, path string, cli *client.Client) error {
+	gameID := repository.NewGameIdentifier(id)
+	if err := l.repo.Mkdir(gameID); err != nil {
+		return err
+	}
+
+	m, err := cli.Metadata(id)
+	if err != nil {
+		return fmt.Errorf("failed to get metadata from the server: %w", err)
+	}
+
+	if err := l.repo.WriteMetadata(gameID, m); err != nil {
+		return fmt.Errorf("failed to write metadata: %w", err)
+	}
+
+	archivePath := filepath.Join(l.repo.DataPath(gameID), "data.tar.gz")
+
+	if err := cli.Pull(id, archivePath); err != nil {
+		return fmt.Errorf("failed to pull from the server: %w", err)
+	}
+
+	f, err := l.repo.ReadBlob(gameID)
+	if err != nil {
+		return fmt.Errorf("failed to open blob from local repository: %w", err)
+	}
+
+	if err := os.MkdirAll(path, 0740); err != nil {
+		return fmt.Errorf("failed to create destination directory: %w", err)
+	}
+
+	if err := archive.Untar(f, path); err != nil {
+		return fmt.Errorf("failed to untar archive: %w", err)
+	}
+
+	if err := l.repo.ResetLastScan(gameID); err != nil {
+		return fmt.Errorf("failed to create .last_run file: %w", err)
+	}
+
+	return nil
+}
+
+func (l Service) PullBackup(gameID, backupID string, cli *client.Client) error {
+	id := repository.NewBackupIdentifier(gameID, backupID)
+
+	archivePath := filepath.Join(l.repo.DataPath(id), "data.tar.gz")
+
+	if err := cli.PullBackup(gameID, backupID, archivePath); err != nil {
+		return fmt.Errorf("failed to pull backup: %w", err)
+	}
+
+	return nil
+}
+
+func (l Service) RemoveGame(gameID string) error {
+	return l.repo.Remove(repository.NewGameIdentifier(gameID))
+}
+
+func (l Service) SetVersion(gameID string, value int) error {
+	id := repository.NewGameIdentifier(gameID)
+
+	m, err := l.repo.Metadata(id)
+	if err != nil {
+		return fmt.Errorf("failed to get metadata from the server: %w", err)
+	}
+
+	m.Version = value
+
+	if err := l.repo.WriteMetadata(id, m); err != nil {
+		return fmt.Errorf("failed to write metadata: %w", err)
+	}
+
+	return nil
+}
+
+func IsDirectoryChanged(path string, lastRun time.Time) bool {
+	changed := false
+	_ = filepath.Walk(path, func(path string, info os.FileInfo, walkErr error) error {
+		if walkErr != nil {
+			return nil
+		}
+		if info.ModTime().After(lastRun) {
+			changed = true
+			return io.EOF // early exit
+		}
+		return nil
+	})
+	return changed
+}

pkg/repository/repository.go

@@ -2,7 +2,6 @@ package repository
 
 import (
 	"cloudsave/pkg/tools/hash"
-	"cloudsave/pkg/tools/id"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -10,8 +9,6 @@ import (
 	"os"
 	"path/filepath"
 	"time"
-
-	"github.com/google/uuid"
 )
 
 type (
@@ -21,6 +18,12 @@ type (
 		Path    string    `json:"path"`
 		Version int       `json:"version"`
 		Date    time.Time `json:"date"`
+		MD5     string    `json:"-"`
+	}
+
+	Remote struct {
+		URL    string `json:"url"`
+		GameID string `json:"-"`
 	}
 
 	Backup struct {
@@ -29,6 +32,57 @@ type (
 		UUID        string    `json:"uuid"`
 		ArchivePath string    `json:"-"`
 	}
+
+	Data struct {
+		Metadata Metadata
+		DataPath string
+		Backup   map[string]Data
+	}
+
+	GameIdentifier struct {
+		gameID string
+	}
+
+	BackupIdentifier struct {
+		gameID   string
+		backupID string
+	}
+
+	Identifier interface {
+		Key() string
+	}
+
+	LazyRepository struct {
+		dataRoot string
+	}
+
+	EagerRepository struct {
+		LazyRepository
+
+		data map[string]Data
+	}
+
+	Repository interface {
+		Mkdir(id Identifier) error
+
+		All() ([]string, error)
+		AllHist(gameID GameIdentifier) ([]string, error)
+
+		WriteBlob(ID Identifier) (io.Writer, error)
+		WriteMetadata(gameID GameIdentifier, m Metadata) error
+
+		Metadata(gameID GameIdentifier) (Metadata, error)
+		LastScan(gameID GameIdentifier) (time.Time, error)
+		ReadBlob(gameID Identifier) (io.Reader, error)
+		Backup(id BackupIdentifier) (Backup, error)
+
+		SetRemote(gameID GameIdentifier, url string) error
+		ResetLastScan(id GameIdentifier) error
+
+		DataPath(id Identifier) string
+
+		Remove(gameID GameIdentifier) error
+	}
 )
 
 var (
@@ -36,347 +90,232 @@ var (
 	datastorepath string
 )
 
-func init() {
+func NewGameIdentifier(gameID string) GameIdentifier {
-	var err error
+	return GameIdentifier{
-	roaming, err = os.UserConfigDir()
+		gameID: gameID,
-	if err != nil {
-		panic("failed to get user config path: " + err.Error())
 	}
+}
+func (bi GameIdentifier) Key() string {
+	return bi.gameID
+}
 
-	datastorepath = filepath.Join(roaming, "cloudsave", "data")
+func NewBackupIdentifier(gameID, backupID string) BackupIdentifier {
-	err = os.MkdirAll(datastorepath, 0740)
+	return BackupIdentifier{
-	if err != nil {
+		gameID:   gameID,
-		panic("cannot make the datastore:" + err.Error())
+		backupID: backupID,
 	}
 }
 
-func Add(name, path string) (Metadata, error) {
+func (bi BackupIdentifier) Key() string {
-	m := Metadata{
+	return bi.gameID + ":" + bi.backupID
-		ID:   id.New(),
-		Name: name,
-		Path: path,
-	}
-
-	err := os.MkdirAll(filepath.Join(datastorepath, m.ID), 0740)
-	if err != nil {
-		panic("cannot make directory for the game:" + err.Error())
-	}
-
-	f, err := os.OpenFile(filepath.Join(datastorepath, m.ID, "metadata.json"), os.O_CREATE|os.O_WRONLY, 0740)
-	if err != nil {
-		return Metadata{}, fmt.Errorf("cannot open the metadata file in the datastore: %w", err)
-	}
-	defer f.Close()
-
-	e := json.NewEncoder(f)
-	err = e.Encode(m)
-	if err != nil {
-		return Metadata{}, fmt.Errorf("cannot write into the metadata file in the datastore: %w", err)
-	}
-
-	return m, nil
 }
 
-func Register(m Metadata, path string) error {
+func NewLazyRepository(dataRootPath string) (Repository, error) {
-	m.Path = path
+	m, err := os.Stat(dataRootPath)
-
-	err := os.MkdirAll(filepath.Join(datastorepath, m.ID), 0740)
 	if err != nil {
-		panic("cannot make directory for the game:" + err.Error())
+		return nil, fmt.Errorf("failed to open datastore: %w", err)
 	}
 
-	f, err := os.OpenFile(filepath.Join(datastorepath, m.ID, "metadata.json"), os.O_CREATE|os.O_WRONLY, 0740)
+	if !m.IsDir() {
-	if err != nil {
+		return nil, fmt.Errorf("failed to open datastore: not a directory")
-		return fmt.Errorf("cannot open the metadata file in the datastore: %w", err)
-	}
-	defer f.Close()
-
-	e := json.NewEncoder(f)
-	err = e.Encode(m)
-	if err != nil {
-		return fmt.Errorf("cannot write into the metadata file in the datastore: %w", err)
 	}
 
-	return nil
+	return &LazyRepository{
+		dataRoot: dataRootPath,
+	}, nil
 }
 
-func All() ([]Metadata, error) {
+func (l LazyRepository) Mkdir(id Identifier) error {
-	ds, err := os.ReadDir(datastorepath)
+	return os.MkdirAll(l.DataPath(id), 0740)
-	if err != nil {
-		return nil, fmt.Errorf("cannot open the datastore: %w", err)
-	}
-
-	var datastore []Metadata
-	for _, d := range ds {
-		content, err := os.ReadFile(filepath.Join(datastorepath, d.Name(), "metadata.json"))
-		if err != nil {
-			continue
-		}
-
-		var m Metadata
-		err = json.Unmarshal(content, &m)
-		if err != nil {
-			return nil, fmt.Errorf("corrupted datastore: failed to parse %s/metadata.json: %w", d.Name(), err)
-		}
-
-		datastore = append(datastore, m)
-	}
-	return datastore, nil
 }
 
-func One(gameID string) (Metadata, error) {
+func (l LazyRepository) All() ([]string, error) {
-	_, err := os.ReadDir(datastorepath)
+	dir, err := os.ReadDir(l.dataRoot)
 	if err != nil {
-		return Metadata{}, fmt.Errorf("cannot open the datastore: %w", err)
+		return nil, fmt.Errorf("failed to open directory: %w", err)
 	}
 
-	content, err := os.ReadFile(filepath.Join(datastorepath, gameID, "metadata.json"))
+	var res []string
-	if err != nil {
+	for _, d := range dir {
-		return Metadata{}, fmt.Errorf("game not found: %w", err)
+		res = append(res, d.Name())
 	}
 
-	var m Metadata
-	err = json.Unmarshal(content, &m)
-	if err != nil {
-		return Metadata{}, fmt.Errorf("corrupted datastore: failed to parse %s/metadata.json: %w", gameID, err)
-	}
-
-	return m, nil
-}
-
-func MakeArchive(gameID string) error {
-	path := filepath.Join(datastorepath, gameID, "data.tar.gz")
-
-	// open old
-	f, err := os.OpenFile(path, os.O_RDONLY, 0)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return nil
-		}
-		return fmt.Errorf("failed to open old file: %w", err)
-	}
-	defer f.Close()
-
-	histDirPath := filepath.Join(datastorepath, gameID, "hist", uuid.NewString())
-	if err := os.MkdirAll(histDirPath, 0740); err != nil {
-		return fmt.Errorf("failed to make directory: %w", err)
-	}
-
-	// open new
-	nf, err := os.OpenFile(filepath.Join(histDirPath, "data.tar.gz"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
-	if err != nil {
-		return fmt.Errorf("failed to open new file: %w", err)
-	}
-	defer nf.Close()
-
-	// copy
-	if _, err := io.Copy(nf, f); err != nil {
-		return fmt.Errorf("failed to copy data: %w", err)
-	}
-
-	return nil
-}
-
-func RestoreArchive(gameID, uuid string) error {
-	histDirPath := filepath.Join(datastorepath, gameID, "hist", uuid)
-	if err := os.MkdirAll(histDirPath, 0740); err != nil {
-		return fmt.Errorf("failed to make directory: %w", err)
-	}
-
-	// open old
-	nf, err := os.OpenFile(filepath.Join(histDirPath, "data.tar.gz"), os.O_RDONLY, 0)
-	if err != nil {
-		return fmt.Errorf("failed to open new file: %w", err)
-	}
-	defer nf.Close()
-
-	path := filepath.Join(datastorepath, gameID, "data.tar.gz")
-
-	// open new
-	f, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return nil
-		}
-		return fmt.Errorf("failed to open old file: %w", err)
-	}
-	defer f.Close()
-
-	// copy
-	if _, err := io.Copy(f, nf); err != nil {
-		return fmt.Errorf("failed to copy data: %w", err)
-	}
-
-	return nil
-}
-
-func Archive(gameID, uuid string) (Backup, error) {
-	histDirPath := filepath.Join(datastorepath, gameID, "hist", uuid)
-	if err := os.MkdirAll(histDirPath, 0740); err != nil {
-		return Backup{}, fmt.Errorf("failed to make 'hist' directory")
-	}
-
-	finfo, err := os.Stat(histDirPath)
-	if err != nil {
-		return Backup{}, fmt.Errorf("corrupted datastore: %w", err)
-	}
-	archivePath := filepath.Join(histDirPath, "data.tar.gz")
-
-	h, err := hash.FileMD5(archivePath)
-	if err != nil {
-		return Backup{}, fmt.Errorf("failed to calculate md5 hash: %w", err)
-	}
-
-	b := Backup{
-		CreatedAt:   finfo.ModTime(),
-		UUID:        filepath.Base(finfo.Name()),
-		MD5:         h,
-		ArchivePath: archivePath,
-	}
-
-	return b, nil
-}
-
-func Archives(gameID string) ([]Backup, error) {
-	histDirPath := filepath.Join(datastorepath, gameID, "hist")
-	if err := os.MkdirAll(histDirPath, 0740); err != nil {
-		return nil, fmt.Errorf("failed to make 'hist' directory")
-	}
-
-	d, err := os.ReadDir(histDirPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open 'hist' directory")
-	}
-
-	var res []Backup
-	for _, f := range d {
-		finfo, err := f.Info()
-		if err != nil {
-			return nil, fmt.Errorf("corrupted datastore: %w", err)
-		}
-		path := filepath.Join(histDirPath, finfo.Name())
-		archivePath := filepath.Join(path, "data.tar.gz")
-
-		h, err := hash.FileMD5(archivePath)
-		if err != nil {
-			return nil, fmt.Errorf("failed to calculate md5 hash: %w", err)
-		}
-
-		b := Backup{
-			CreatedAt:   finfo.ModTime(),
-			UUID:        filepath.Base(finfo.Name()),
-			MD5:         h,
-			ArchivePath: archivePath,
-		}
-
-		res = append(res, b)
-	}
 	return res, nil
 }
 
-func DatastorePath() string {
+func (l LazyRepository) AllHist(id GameIdentifier) ([]string, error) {
-	return datastorepath
+	path := l.DataPath(id)
+
+	dir, err := os.ReadDir(filepath.Join(path, "hist"))
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("failed to open directory: %w", err)
+	}
+
+	var res []string
+	for _, d := range dir {
+		res = append(res, d.Name())
+	}
+
+	return res, nil
 }
 
-func Remove(gameID string) error {
+func (l LazyRepository) WriteBlob(ID Identifier) (io.Writer, error) {
-	err := os.RemoveAll(filepath.Join(datastorepath, gameID))
+	path := l.DataPath(ID)
+
+	dst, err := os.OpenFile(filepath.Join(path, "data.tar.gz"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
 	if err != nil {
-		return err
+		return nil, fmt.Errorf("failed to open destination file: %w", err)
 	}
-	return nil
+
+	return dst, nil
 }
 
-func Hash(gameID string) (string, error) {
+func (l LazyRepository) WriteMetadata(id GameIdentifier, m Metadata) error {
-	path := filepath.Join(datastorepath, gameID, "data.tar.gz")
+	path := l.DataPath(id)
 
-	return hash.FileMD5(path)
+	dst, err := os.OpenFile(filepath.Join(path, "metadata.json"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
-}
-
-func Version(gameID string) (int, error) {
-	path := filepath.Join(datastorepath, gameID, "metadata.json")
-
-	f, err := os.OpenFile(path, os.O_RDONLY, 0)
 	if err != nil {
-		return 0, err
+		return fmt.Errorf("failed to open destination file: %w", err)
 	}
-	defer f.Close()
+	defer dst.Close()
 
-	var metadata Metadata
+	e := json.NewEncoder(dst)
-	d := json.NewDecoder(f)
+	if err := e.Encode(m); err != nil {
-	err = d.Decode(&metadata)
+		return fmt.Errorf("failed to encode data: %w", err)
-	if err != nil {
-		return 0, err
-	}
-
-	return metadata.Version, nil
-}
-
-func SetVersion(gameID string, version int) error {
-	path := filepath.Join(datastorepath, gameID, "metadata.json")
-
-	f, err := os.OpenFile(path, os.O_RDONLY, 0)
-	if err != nil {
-		return err
-	}
-
-	var metadata Metadata
-	d := json.NewDecoder(f)
-	err = d.Decode(&metadata)
-	if err != nil {
-		f.Close()
-		return err
-	}
-
-	f.Close()
-
-	metadata.Version = version
-
-	f, err = os.OpenFile(path, os.O_WRONLY|os.O_TRUNC, 0740)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	e := json.NewEncoder(f)
-	err = e.Encode(metadata)
-	if err != nil {
-		return err
 	}
 
 	return nil
 }
 
-func SetDate(gameID string, dt time.Time) error {
+func (l LazyRepository) Metadata(id GameIdentifier) (Metadata, error) {
-	path := filepath.Join(datastorepath, gameID, "metadata.json")
+	path := l.DataPath(id)
 
-	f, err := os.OpenFile(path, os.O_RDONLY, 0)
+	src, err := os.OpenFile(filepath.Join(path, "metadata.json"), os.O_RDONLY, 0)
 	if err != nil {
-		return err
+		return Metadata{}, fmt.Errorf("corrupted datastore: failed to open metadata: %w", err)
 	}
 
-	var metadata Metadata
+	var m Metadata
-	d := json.NewDecoder(f)
+	d := json.NewDecoder(src)
-	err = d.Decode(&metadata)
+	if err := d.Decode(&m); err != nil {
-	if err != nil {
+		return Metadata{}, fmt.Errorf("corrupted datastore: failed to parse metadata: %w", err)
-		f.Close()
-		return err
 	}
 
-	f.Close()
+	m.MD5, err = hash.FileMD5(filepath.Join(path, "data.tar.gz"))
-
-	metadata.Date = dt
-
-	f, err = os.OpenFile(path, os.O_WRONLY|os.O_TRUNC, 0740)
 	if err != nil {
-		return err
+		return Metadata{}, fmt.Errorf("failed to calculate md5: %w", err)
+	}
+
+	return m, nil
+}
+
+func (l LazyRepository) Backup(id BackupIdentifier) (Backup, error) {
+	path := l.DataPath(id)
+
+	fs, err := os.Stat(filepath.Join(path, "data.tar.gz"))
+	if err != nil {
+		return Backup{}, fmt.Errorf("corrupted datastore: failed to open metadata: %w", err)
+	}
+
+	h, err := hash.FileMD5(filepath.Join(path, "data.tar.gz"))
+	if err != nil {
+		return Backup{}, fmt.Errorf("corrupted datastore: failed to open metadata: %w", err)
+	}
+
+	return Backup{
+		CreatedAt:   fs.ModTime(),
+		MD5:         h,
+		UUID:        id.backupID,
+		ArchivePath: filepath.Join(path, "data.tar.gz"),
+	}, nil
+}
+
+func (l LazyRepository) LastScan(id GameIdentifier) (time.Time, error) {
+	path := l.DataPath(id)
+
+	data, err := os.ReadFile(filepath.Join(path, ".last_run"))
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return time.Time{}, nil
+		}
+		return time.Time{}, fmt.Errorf("failed to reading state file: %w", err)
+	}
+
+	lastRun, err := time.Parse(time.RFC3339, string(data))
+	if err != nil {
+		return time.Time{}, fmt.Errorf("parsing state file timestamp: %w", err)
+	}
+
+	return lastRun, nil
+}
+
+func (l LazyRepository) ResetLastScan(id GameIdentifier) error {
+	path := l.DataPath(id)
+
+	f, err := os.OpenFile(filepath.Join(path, ".last_run"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
+	if err != nil {
+		return fmt.Errorf("failed to open file: %w", err)
 	}
 	defer f.Close()
 
-	e := json.NewEncoder(f)
+	data := time.Now().Format(time.RFC3339)
-	err = e.Encode(metadata)
+
-	if err != nil {
+	if _, err := f.WriteString(data); err != nil {
-		return err
+		return fmt.Errorf("failed to write file: %w", err)
 	}
 
 	return nil
 }
+
+func (l LazyRepository) ReadBlob(id Identifier) (io.Reader, error) {
+	path := l.DataPath(id)
+
+	dst, err := os.OpenFile(filepath.Join(path, "data.tar.gz"), os.O_RDONLY, 0)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open blob: %w", err)
+	}
+
+	return dst, nil
+}
+
+func (l LazyRepository) SetRemote(id GameIdentifier, url string) error {
+	path := l.DataPath(id)
+
+	src, err := os.OpenFile(filepath.Join(path, "remote.json"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
+	if err != nil {
+		return fmt.Errorf("failed to open remote description: %w", err)
+	}
+	defer src.Close()
+
+	var r Remote
+	d := json.NewEncoder(src)
+	if err := d.Encode(r); err != nil {
+		return fmt.Errorf("failed to marshall remote description: %w", err)
+	}
+
+	return nil
+}
+
+func (l LazyRepository) Remove(id GameIdentifier) error {
+	path := l.DataPath(id)
+
+	if err := os.RemoveAll(path); err != nil {
+		return fmt.Errorf("failed to remove game folder from the datastore: %w", err)
+	}
+
+	return nil
+}
+
+func (r LazyRepository) DataPath(id Identifier) string {
+	switch identifier := id.(type) {
+	case GameIdentifier:
+		return filepath.Join(r.dataRoot, identifier.gameID)
+	case BackupIdentifier:
+		return filepath.Join(r.dataRoot, identifier.gameID, "hist", identifier.backupID)
+	}
+
+	panic("identifier type not supported")
+}