Move atomicError type into internal package

Move atomicError type into internal package

agent.go

@@ -11,6 +11,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	atomicx "github.com/pion/ice/v2/internal/atomic"
 	"github.com/pion/logging"
 	"github.com/pion/mdns"
 	"github.com/pion/stun"
@@ -114,7 +115,7 @@ type Agent struct {
 	// State for closing
 	done         chan struct{}
 	taskLoopDone chan struct{}
-	err          atomicError
+	err          atomicx.Error
 
 	gatherCandidateCancel func()
 	gatherCandidateDone   chan struct{}

internal/atomic/atomic.go

@@ -0,0 +1,20 @@
+// Package atomic contains custom atomic types
+package atomic
+
+import "sync/atomic"
+
+// Error is an atomic error
+type Error struct {
+	v atomic.Value
+}
+
+// Store updates the value of the atomic variable
+func (a *Error) Store(err error) {
+	a.v.Store(struct{ error }{err})
+}
+
+// Load retrieves the current value of the atomic variable
+func (a *Error) Load() error {
+	err, _ := a.v.Load().(struct{ error })
+	return err.error
+}

util.go

@@ -3,25 +3,13 @@ package ice
 import (
 	"fmt"
 	"net"
-	"sync/atomic"
 	"time"
 
 	"github.com/pion/logging"
 	"github.com/pion/stun"
 	"github.com/pion/transport/v2"
 )
 
-type atomicError struct{ v atomic.Value }
-
-func (a *atomicError) Store(err error) {
-	a.v.Store(struct{ error }{err})
-}
-
-func (a *atomicError) Load() error {
-	err, _ := a.v.Load().(struct{ error })
-	return err.error
-}
-
 // The conditions of invalidation written below are defined in
 // https://tools.ietf.org/html/rfc8445#section-5.1.1.1
 func isSupportedIPv6(ip net.IP) bool {