very rudimentary sync (#438)

util/sync/filesystem.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"fmt"
 	"golang.org/x/net/webdav"
+	"io"
 	"io/fs"
 	"os"
+	"path/filepath"
 )
 
 type FilesystemTargetConfig struct {
@@ -13,16 +15,20 @@ type FilesystemTargetConfig struct {
 }
 
 type FilesystemTarget struct {
+	cfg  *FilesystemTargetConfig
 	root fs.FS
 	tree []*Object
 }
 
 func NewFilesystemTarget(cfg *FilesystemTargetConfig) *FilesystemTarget {
 	root := os.DirFS(cfg.Root)
-	return &FilesystemTarget{root: root}
+	return &FilesystemTarget{cfg: cfg, root: root}
 }
 
 func (t *FilesystemTarget) Inventory() ([]*Object, error) {
+	if _, err := os.Stat(t.cfg.Root); os.IsNotExist(err) {
+		return nil, nil
+	}
 	t.tree = nil
 	if err := fs.WalkDir(t.root, ".", t.recurse); err != nil {
 		return nil, err
@@ -52,3 +58,24 @@ func (t *FilesystemTarget) recurse(path string, d fs.DirEntry, err error) error
 	}
 	return nil
 }
+
+func (t *FilesystemTarget) ReadStream(path string) (io.ReadCloser, error) {
+	return os.Open(path)
+}
+
+func (t *FilesystemTarget) WriteStream(path string, stream io.Reader, mode os.FileMode) error {
+	targetPath := filepath.Join(t.cfg.Root, path)
+
+	if err := os.MkdirAll(filepath.Dir(targetPath), mode); err != nil {
+		return err
+	}
+	f, err := os.Create(targetPath)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(f, stream)
+	if err != nil {
+		return err
+	}
+	return nil
+}

util/sync/model.go

@@ -1,6 +1,10 @@
 package sync
 
-import "time"
+import (
+	"io"
+	"os"
+	"time"
+)
 
 type Object struct {
 	Path     string
@@ -11,4 +15,6 @@ type Object struct {
 
 type Target interface {
 	Inventory() ([]*Object, error)
+	ReadStream(path string) (io.ReadCloser, error)
+	WriteStream(path string, stream io.Reader, mode os.FileMode) error
 }

util/sync/synchronizer.go

@@ -3,6 +3,7 @@ package sync
 import (
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"os"
 )
 
 func Synchronize(src, dst Target) error {
@@ -32,9 +33,16 @@ func Synchronize(src, dst Target) error {
 		}
 	}
 
-	logrus.Infof("files to copy:")
-	for _, copy := range copyList {
-		logrus.Infof("-> %v", copy.Path)
+	for _, target := range copyList {
+		logrus.Infof("+> %v", target.Path)
+		ss, err := src.ReadStream(target.Path)
+		if err != nil {
+			return err
+		}
+		if err := dst.WriteStream(target.Path, ss, os.ModePerm); err != nil {
+			return err
+		}
+		logrus.Infof("=> %v", target.Path)
 	}
 
 	return nil

util/sync/webdav.go

@@ -3,6 +3,8 @@ package sync
 import (
 	"github.com/pkg/errors"
 	"github.com/studio-b12/gowebdav"
+	"io"
+	"os"
 	"path/filepath"
 )
 
@@ -57,3 +59,11 @@ func (t *WebDAVTarget) recurse(path string, tree []*Object) ([]*Object, error) {
 	}
 	return tree, nil
 }
+
+func (t *WebDAVTarget) ReadStream(path string) (io.ReadCloser, error) {
+	return t.c.ReadStream(path)
+}
+
+func (t *WebDAVTarget) WriteStream(path string, stream io.Reader, mode os.FileMode) error {
+	return t.c.WriteStream(path, stream, mode)
+}