Expose the minimum fee rate on protocol, shared by feefilter.

include/bitcoin/node/protocols/protocol.hpp

@@ -67,6 +67,9 @@ class BCN_API protocol
     /// The candidate|confirmed chain is current.
     virtual bool is_current_chain(bool confirmed) const NOEXCEPT;
 
+    /// The minimum fee rate (satoshis/kvB) to relay, max_money if not pooling.
+    virtual uint64_t minimum_fee_rate() const NOEXCEPT;
+
     /// Zulu time at which the node started.
     virtual time_t start_time() const NOEXCEPT;
 

src/protocols/protocol.cpp

@@ -66,6 +66,12 @@ bool protocol::is_current_chain(bool confirmed) const NOEXCEPT
     return session_->is_current_chain(confirmed);
 }
 
+uint64_t protocol::minimum_fee_rate() const NOEXCEPT
+{
+    return is_current_chain(true) ? node_settings().minimum_fee_rate_() :
+        system_settings().max_money();
+}
+
 time_t protocol::start_time() const NOEXCEPT
 {
     return session_->start_time();

src/protocols/protocol_transaction_out_70013.cpp

@@ -54,15 +54,12 @@ void protocol_transaction_out_70013::start() NOEXCEPT
 // Outbound (feefilter).
 // ----------------------------------------------------------------------------
 
-// bip133: a tx below the advertised rate is not announced to us, and the
-// maximum suppresses relay entirely, as txs are not accepted when not current.
+// bip133: a tx below the advertised rate is not announced to us.
 void protocol_transaction_out_70013::do_send_fee_filter() NOEXCEPT
 {
     BC_ASSERT(stranded());
 
-    const auto minimum = is_current_chain(true) ?
-        node_settings().minimum_fee_rate_() :
-        system_settings().max_money();
+    const auto minimum = minimum_fee_rate();
 
     if (minimum == sent_fee_)
         return;