[#6] Add caching from multiple environments

internal/chain/chain.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"os"
 	"path"
-	"strconv"
 
 	"git.frostfs.info/TrueCloudLab/monza/internal/bytecode"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
@@ -47,7 +46,15 @@ func Open(ctx context.Context, dir, endpoint string, rewrite bool) (*Chain, erro
 		return nil, fmt.Errorf("rpc get version: %w", err)
 	}
 
-	dbPath := path.Join(dir, strconv.Itoa(int(v.Protocol.Network))+".db")
+	validationBlock, err := getValidationBlock(cli)
+	if err != nil {
+		return nil, fmt.Errorf("error get validation block: %w", err)
+	}
+	if validationBlock == nil {
+		return nil, fmt.Errorf("validation block does not exist: %w", err)
+	}
+
+	dbPath := path.Join(dir, validationBlock.Hash().String()+".db")
 	if rewrite {
 		_ = os.Remove(dbPath) // ignore error if file does not exist, etc.
 	}
@@ -60,6 +67,18 @@ func Open(ctx context.Context, dir, endpoint string, rewrite bool) (*Chain, erro
 	return &Chain{db, v.Protocol.StateRootInHeader, cli}, nil
 }
 
+func getValidationBlock(cli *rpcclient.Client) (*block.Block, error) {
+	// not 0, because it always has the same hash
+	const validationBlockIndex = 1
+	var err error
+	validBlock, err := cli.GetBlockByIndex(validationBlockIndex)
+	if err != nil {
+		return nil, fmt.Errorf("error sending request for block: %w", err)
+	}
+
+	return validBlock, nil
+}
+
 func (d *Chain) Block(i uint32) (res *block.Block, err error) {
 	cached, err := d.block(i)
 	if err != nil {