Implement "feefilter" P2P message.

The "feefilter" p2p message is used to inform other nodes of your mempool min fee which is the feerate that any new transaction must meet to be accepted to your mempool.  This will allow them to filter invs to you according to this feerate.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/main.h b/src/main.h
index a011ba4e55..0bfcfab213 100644
--- a/src/main.h
+++ b/src/main.h
@@ -102,6 +102,10 @@ static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
 /** Average delay between trickled inventory broadcasts in seconds.
  *  Blocks, whitelisted receivers, and a random 25% of transactions bypass this. */
 static const unsigned int AVG_INVENTORY_BROADCAST_INTERVAL = 5;
+/** Average delay between feefilter broadcasts in seconds. */
+static const unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60;
+/** Maximum feefilter broadcast delay after significant change. */
+static const unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60;
 
 static const unsigned int DEFAULT_LIMITFREERELAY = 15;
 static const bool DEFAULT_RELAYPRIORITY = true;
@@ -117,6 +121,8 @@ static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
 static const bool DEFAULT_TESTSAFEMODE = false;
 /** Default for -mempoolreplacement */
 static const bool DEFAULT_ENABLE_REPLACEMENT = true;
+/** Default for using fee filter */
+static const bool DEFAULT_FEEFILTER = true;
 
 /** Maximum number of headers to announce when relaying blocks with headers message.*/
 static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
@@ -282,7 +288,7 @@ void PruneAndFlush();
 
 /** (try to) add transaction to memory pool **/
 bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
-                        bool* pfMissingInputs, bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
+                        bool* pfMissingInputs, CFeeRate* txFeeRate, bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
 
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state);