Add commands 'cat','list' and 'ls'

cmd/khepri/cmd_cat.go

@@ -0,0 +1,133 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/fd0/khepri"
+	"github.com/fd0/khepri/backend"
+)
+
+func commandCat(be backend.Server, key *khepri.Key, args []string) error {
+	if len(args) != 2 {
+		return errors.New("usage: cat [blob|tree|snapshot|key|lock] ID")
+	}
+
+	tpe := args[0]
+
+	id, err := backend.ParseID(args[1])
+	if err != nil {
+		return err
+	}
+
+	ch, err := khepri.NewContentHandler(be, key)
+	if err != nil {
+		return err
+	}
+
+	err = ch.LoadAllSnapshots()
+	if err != nil {
+		return err
+	}
+
+	switch tpe {
+	case "blob":
+		// try id
+		data, err := ch.Load(backend.Blob, id)
+		if err == nil {
+			_, err = os.Stdout.Write(data)
+			return err
+		}
+
+		// try storage id
+		buf, err := be.Get(backend.Blob, id)
+		if err != nil {
+			return err
+		}
+
+		// decrypt
+		buf, err = key.Decrypt(buf)
+		if err != nil {
+			return err
+		}
+
+		_, err = os.Stdout.Write(data)
+		return err
+
+	case "tree":
+		var tree khepri.Tree
+		// try id
+		err := ch.LoadJSON(backend.Tree, id, &tree)
+		if err != nil {
+			// try storage id
+			buf, err := be.Get(backend.Tree, id)
+			if err != nil {
+				return err
+			}
+
+			// decrypt
+			buf, err = key.Decrypt(buf)
+			if err != nil {
+				return err
+			}
+
+			// unmarshal
+			err = json.Unmarshal(backend.Uncompress(buf), &tree)
+			if err != nil {
+				return err
+			}
+		}
+
+		buf, err := json.MarshalIndent(&tree, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "snapshot":
+		var sn khepri.Snapshot
+		err := ch.LoadJSONRaw(backend.Snapshot, id, &sn)
+		if err != nil {
+			return err
+		}
+
+		buf, err := json.MarshalIndent(&sn, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "key":
+		data, err := be.Get(backend.Key, id)
+		if err != nil {
+			return err
+		}
+
+		var key khepri.Key
+		err = json.Unmarshal(data, &key)
+		if err != nil {
+			return err
+		}
+
+		buf, err := json.MarshalIndent(&key, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "lock":
+		return errors.New("not yet implemented")
+	default:
+		return errors.New("invalid type")
+	}
+
+	return nil
+}