add smartchef harvest method

pancakeswap/smartchef.go

@@ -0,0 +1,35 @@
+package pancakeswap
+
+import (
+	"context"
+	"math/big"
+
+	"git.lehouerou.net/laurent/evm"
+	"git.lehouerou.net/laurent/evm/bsc"
+	"git.lehouerou.net/laurent/evm/pancakeswap/contracts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/pkg/errors"
+)
+
+type SmartChef struct {
+	client   *bsc.Client
+	contract *contracts.SmartChef
+}
+
+func NewSmartChef(client *bsc.Client, address common.Address) (*SmartChef, error) {
+	contract, err := contracts.NewSmartChef(address, client)
+	if err != nil {
+		return nil, errors.Wrap(err, "init contract")
+	}
+	return &SmartChef{
+		client:   client,
+		contract: contract,
+	}, nil
+}
+
+func (s *SmartChef) Harvest(ctx context.Context) (evm.Transaction, error) {
+	return s.client.Execute(ctx, func(ctx context.Context, opts *evm.TransactOpts) (*types.Transaction, error) {
+		return s.contract.Deposit(opts.TransactOpts, big.NewInt(0))
+	})
+}