mining/mempool: Export MinHighPriority from mining.

This move the export for MinHighPriority from the mempool package to the
mining package.  This should have been done when the priority
calculation code was moved to the mining package.

mempool/mempool.go

@@ -30,10 +30,6 @@ const (
 	// inclusion when generating block templates.
 	DefaultBlockPrioritySize = 50000
 
-	// MinHighPriority is the minimum priority value that allows a
-	// transaction to be considered high priority.
-	MinHighPriority = btcutil.SatoshiPerBitcoin * 144.0 / 250
-
 	// orphanTTL is the maximum amount of time an orphan is allowed to
 	// stay in the orphan pool before it expires and is evicted during the
 	// next scan.
@@ -797,10 +793,10 @@ func (mp *TxPool) maybeAcceptTransaction(tx *btcutil.Tx, isNew, rateLimit, rejec
 	if isNew && !mp.cfg.Policy.DisableRelayPriority && txFee < minFee {
 		currentPriority := mining.CalcPriority(tx.MsgTx(), utxoView,
 			nextBlockHeight)
-		if currentPriority <= MinHighPriority {
+		if currentPriority <= mining.MinHighPriority {
 			str := fmt.Sprintf("transaction %v has insufficient "+
 				"priority (%g <= %g)", txHash,
-				currentPriority, MinHighPriority)
+				currentPriority, mining.MinHighPriority)
 			return nil, txRuleError(wire.RejectInsufficientFee, str)
 		}
 	}

mining.go

@@ -12,7 +12,6 @@ import (
 	"github.com/btcsuite/btcd/blockchain"
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
-	"github.com/btcsuite/btcd/mempool"
 	"github.com/btcsuite/btcd/mining"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
@@ -638,13 +637,13 @@ mempoolLoop:
 		// the priority size or there are no more high-priority
 		// transactions.
 		if !sortedByFee && (blockPlusTxSize >= policy.BlockPrioritySize ||
-			prioItem.priority <= mempool.MinHighPriority) {
+			prioItem.priority <= mining.MinHighPriority) {
 
 			minrLog.Tracef("Switching to sort by fees per "+
 				"kilobyte blockSize %d >= BlockPrioritySize "+
 				"%d || priority %.2f <= minHighPriority %.2f",
 				blockPlusTxSize, policy.BlockPrioritySize,
-				prioItem.priority, mempool.MinHighPriority)
+				prioItem.priority, mining.MinHighPriority)
 
 			sortedByFee = true
 			priorityQueue.SetLessFunc(txPQByFee)
@@ -656,7 +655,7 @@ mempoolLoop:
 			// final one in the high-priority section, so just fall
 			// though to the code below so it is added now.
 			if blockPlusTxSize > policy.BlockPrioritySize ||
-				prioItem.priority < mempool.MinHighPriority {
+				prioItem.priority < mining.MinHighPriority {
 
 				heap.Push(priorityQueue, prioItem)
 				continue

mining/mining.go

@@ -11,6 +11,12 @@ import (
 	"github.com/btcsuite/btcutil"
 )
 
+const (
+	// MinHighPriority is the minimum priority value that allows a
+	// transaction to be considered high priority.
+	MinHighPriority = btcutil.SatoshiPerBitcoin * 144.0 / 250
+)
+
 // TxDesc is a descriptor about a transaction in a transaction source along with
 // additional metadata.
 type TxDesc struct {