Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/chain/adapters/evm.go

@@ -0,0 +1,71 @@
+package adapters
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient"
+)
+
+// EVMAdapter implements ChainAdapter for EVM-compatible chains
+type EVMAdapter struct {
+	client  *ethclient.Client
+	chainID int64
+}
+
+// NewEVMAdapter creates a new EVM chain adapter
+func NewEVMAdapter(client *ethclient.Client, chainID int64) *EVMAdapter {
+	return &EVMAdapter{
+		client:  client,
+		chainID: chainID,
+	}
+}
+
+// ChainAdapter defines the interface for chain adapters
+type ChainAdapter interface {
+	GetBlockByNumber(ctx context.Context, number int64) (*types.Block, error)
+	GetTransaction(ctx context.Context, hash common.Hash) (*types.Transaction, bool, error)
+	GetTransactionReceipt(ctx context.Context, hash common.Hash) (*types.Receipt, error)
+	GetCode(ctx context.Context, address common.Address) ([]byte, error)
+	GetBalance(ctx context.Context, address common.Address) (*big.Int, error)
+	GetGasPrice(ctx context.Context) (*big.Int, error)
+	ChainID() int64
+}
+
+// GetBlockByNumber gets a block by number
+func (e *EVMAdapter) GetBlockByNumber(ctx context.Context, number int64) (*types.Block, error) {
+	return e.client.BlockByNumber(ctx, big.NewInt(number))
+}
+
+// GetTransaction gets a transaction by hash
+func (e *EVMAdapter) GetTransaction(ctx context.Context, hash common.Hash) (*types.Transaction, bool, error) {
+	return e.client.TransactionByHash(ctx, hash)
+}
+
+// GetTransactionReceipt gets a transaction receipt
+func (e *EVMAdapter) GetTransactionReceipt(ctx context.Context, hash common.Hash) (*types.Receipt, error) {
+	return e.client.TransactionReceipt(ctx, hash)
+}
+
+// GetCode gets contract code
+func (e *EVMAdapter) GetCode(ctx context.Context, address common.Address) ([]byte, error) {
+	return e.client.CodeAt(ctx, address, nil)
+}
+
+// GetBalance gets account balance
+func (e *EVMAdapter) GetBalance(ctx context.Context, address common.Address) (*big.Int, error) {
+	return e.client.BalanceAt(ctx, address, nil)
+}
+
+// GetGasPrice gets current gas price
+func (e *EVMAdapter) GetGasPrice(ctx context.Context) (*big.Int, error) {
+	return e.client.SuggestGasPrice(ctx)
+}
+
+// ChainID returns the chain ID
+func (e *EVMAdapter) ChainID() int64 {
+	return e.chainID
+}
+