use mtdb.NewBlockDB instead of the whole db context

main.go

@@ -7,11 +7,12 @@ import (
 
 	"github.com/minetest-go/areasparser"
 	"github.com/minetest-go/mtdb"
+	"github.com/minetest-go/mtdb/block"
 	"github.com/sirupsen/logrus"
 )
 
 var Version string
-var ctx *mtdb.Context
+var block_repo block.BlockRepository
 var wd string
 
 func main() {
@@ -35,7 +36,7 @@ func main() {
 		"version": Version,
 	}).Info("Starting mapcleaner")
 
-	ctx, err = mtdb.New(wd)
+	block_repo, err = mtdb.NewBlockDB(wd)
 	if err != nil {
 		panic(err)
 	}

protected.go

@@ -85,7 +85,7 @@ func IsEmerged(chunk_x, chunk_y, chunk_z int) (bool, error) {
 	for _, x := range []int{x1, x2} {
 		for _, y := range []int{y1, y2} {
 			for _, z := range []int{z1, z2} {
-				data, err := ctx.Blocks.GetByPos(x, y, z)
+				data, err := block_repo.GetByPos(x, y, z)
 				if err != nil {
 					return false, err
 				}
@@ -133,7 +133,7 @@ func IsProtected(chunk_x, chunk_y, chunk_z int) (bool, error) {
 						"z": z,
 					}).Debug("Checking mapblock")
 
-					block, err := ctx.Blocks.GetByPos(x, y, z)
+					block, err := block_repo.GetByPos(x, y, z)
 					if err != nil {
 						return false, err
 					}

remove.go

@@ -14,7 +14,7 @@ func RemoveChunk(chunk_x, chunk_y, chunk_z int) error {
 					"z": z,
 				}).Debug("Removing mapblock")
 
-				err := ctx.Blocks.Delete(x, y, z)
+				err := block_repo.Delete(x, y, z)
 				if err != nil {
 					return err
 				}