[RPC] bumpfee

This command allows a user to increase the fee on a wallet transaction T, creating a "bumper" transaction B.
T must signal that it is BIP-125 replaceable.
T's change output is decremented to pay the additional fee.  (B will not add inputs to T.)
T cannot have any descendant transactions.
Once B bumps T, neither T nor B's outputs can be spent until either T or (more likely) B is mined.

Includes code by @jonasschnelli and @ryanofsky

1 files changed, 6 insertions, 0 deletions

diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 8a587f4ed..50c5025c2 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -891,6 +891,9 @@ public:
     //! Get wallet transactions that conflict with given transaction (spend same outputs)
     std::set<uint256> GetConflicts(const uint256& txid) const;
 
+    //! Check if a given transaction has any of its outputs spent by another transaction in the wallet
+    bool HasWalletSpend(const uint256& txid) const;
+
     //! Flush wallet (bitdb flush)
     void Flush(bool shutdown=false);
 
@@ -927,6 +930,9 @@ public:
     /* Mark a transaction (and it in-wallet descendants) as abandoned so its inputs may be respent. */
     bool AbandonTransaction(const uint256& hashTx);
 
+    /** Mark a transaction as replaced by another transaction (e.g., BIP 125). */
+    bool MarkReplaced(const uint256& originalHash, const uint256& newHash);
+
     /* Returns the wallets help message */
     static std::string GetWalletHelpString(bool showDebug);