Move Frontend interface to separate file

1 files changed, 32 insertions, 0 deletions

diff --git a/xeth/frontend.go b/xeth/frontend.go
new file mode 100644
index 000000000..8deb5c98c
--- /dev/null
+++ b/xeth/frontend.go
@@ -0,0 +1,32 @@
+package xeth
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// Frontend should be implemented by users of XEth. Its methods are
+// called whenever XEth makes a decision that requires user input.
+type Frontend interface {
+	// UnlockAccount is called when a transaction needs to be signed
+	// but the key corresponding to the transaction's sender is
+	// locked.
+	//
+	// It should unlock the account with the given address and return
+	// true if unlocking succeeded.
+	UnlockAccount(address []byte) bool
+
+	// This is called for all transactions inititated through
+	// Transact. It should prompt the user to confirm the transaction
+	// and return true if the transaction was acknowledged.
+	//
+	// ConfirmTransaction is not used for Call transactions
+	// because they cannot change any state.
+	ConfirmTransaction(tx *types.Transaction) bool
+}
+
+// dummyFrontend is a non-interactive frontend that allows all
+// transactions but cannot not unlock any keys.
+type dummyFrontend struct{}
+
+func (dummyFrontend) UnlockAccount([]byte) bool                  { return false }
+func (dummyFrontend) ConfirmTransaction(*types.Transaction) bool { return true }