chainntnfs+queue: move ConcurrentQueue to own package 'queue'

chainntnfs/btcdnotify/btcd.go

@@ -14,6 +14,7 @@ import (
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 	"github.com/lightningnetwork/lnd/chainntnfs"
+	"github.com/lightningnetwork/lnd/queue"
 )
 
 const (
@@ -81,8 +82,8 @@ type BtcdNotifier struct {
 
 	bestBlock chainntnfs.BlockEpoch
 
-	chainUpdates *chainntnfs.ConcurrentQueue
-	txUpdates    *chainntnfs.ConcurrentQueue
+	chainUpdates *queue.ConcurrentQueue
+	txUpdates    *queue.ConcurrentQueue
 
 	// spendHintCache is a cache used to query and update the latest height
 	// hints for an outpoint. Each height hint represents the earliest
@@ -115,8 +116,8 @@ func New(config *rpcclient.ConnConfig, spendHintCache chainntnfs.SpendHintCache,
 
 		spendNotifications: make(map[wire.OutPoint]map[uint64]*spendNotification),
 
-		chainUpdates: chainntnfs.NewConcurrentQueue(10),
-		txUpdates:    chainntnfs.NewConcurrentQueue(10),
+		chainUpdates: queue.NewConcurrentQueue(10),
+		txUpdates:    queue.NewConcurrentQueue(10),
 
 		spendHintCache:   spendHintCache,
 		confirmHintCache: confirmHintCache,
@@ -1056,7 +1057,7 @@ type blockEpochRegistration struct {
 
 	epochChan chan *chainntnfs.BlockEpoch
 
-	epochQueue *chainntnfs.ConcurrentQueue
+	epochQueue *queue.ConcurrentQueue
 
 	bestBlock *chainntnfs.BlockEpoch
 
@@ -1081,7 +1082,7 @@ func (b *BtcdNotifier) RegisterBlockEpochNtfn(
 	bestBlock *chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error) {
 
 	reg := &blockEpochRegistration{
-		epochQueue: chainntnfs.NewConcurrentQueue(20),
+		epochQueue: queue.NewConcurrentQueue(20),
 		epochChan:  make(chan *chainntnfs.BlockEpoch, 20),
 		cancelChan: make(chan struct{}),
 		epochID:    atomic.AddUint64(&b.epochClientCounter, 1),