commit inicial do projeto

internal/storage/store.go

@@ -0,0 +1,86 @@
+package storage
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"dejo_node/internal/transactions"
+)
+
+type BlockStore struct {
+	Path string
+}
+
+func NewBlockStore(path string) *BlockStore {
+	_ = os.MkdirAll(path, 0755)
+	return &BlockStore{Path: path}
+}
+
+func (s *BlockStore) SaveBlock(block *transactions.Block) error {
+	file := filepath.Join(s.Path, fmt.Sprintf("block_%03d.json", block.Index))
+	data, err := json.MarshalIndent(block, "", "  ")
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(file, data, 0644)
+}
+
+func (s *BlockStore) LoadBlock(height int) (*transactions.Block, error) {
+	file := filepath.Join(s.Path, fmt.Sprintf("block_%03d.json", height))
+	data, err := ioutil.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	var block transactions.Block
+	err = json.Unmarshal(data, &block)
+	if err != nil {
+		return nil, err
+	}
+	return &block, nil
+}
+
+func (s *BlockStore) ListBlocks() ([]*transactions.Block, error) {
+	files, err := ioutil.ReadDir(s.Path)
+	if err != nil {
+		return nil, err
+	}
+	var blocks []*transactions.Block
+	for _, file := range files {
+		if file.IsDir() || filepath.Ext(file.Name()) != ".json" {
+			continue
+		}
+		heightStr := file.Name()[6:9]
+		height, err := strconv.Atoi(heightStr)
+		if err != nil {
+			continue
+		}
+		block, err := s.LoadBlock(height)
+		if err == nil {
+			blocks = append(blocks, block)
+		}
+	}
+	sort.Slice(blocks, func(i, j int) bool {
+		return blocks[i].Index < blocks[j].Index
+	})
+	return blocks, nil
+}
+
+func (s *BlockStore) GetLatestBlock() (*transactions.Block, error) {
+	blocks, err := s.ListBlocks()
+	if err != nil || len(blocks) == 0 {
+		return nil, fmt.Errorf("nenhum bloco disponível")
+	}
+	return blocks[len(blocks)-1], nil
+}
+
+func (s *BlockStore) GetBlockByIndex(index int) (*transactions.Block, error) {
+	return s.LoadBlock(index)
+}
+
+func (s *BlockStore) LoadAll() ([]*transactions.Block, error) {
+	return s.ListBlocks()
+}