fix: synchronize access to lastPingTime in ticker struct (#99)

* fix: Synchronize access to lastPingTime in Ticker struct

* fix: Synchronize access to lastPingTime in Ticker struct second pass

* updated lasPingTime visibility, gitignored .vscode/settings.json

* update: updated as specified

.gitignore

@@ -1,2 +1,3 @@
 .chglog
-.env
+.env
+.vscode

ticker/ticker.go

@@ -9,6 +9,7 @@ import (
 	"math"
 	"net/url"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -28,7 +29,7 @@ type Ticker struct {
 
 	url                 url.URL
 	callbacks           callbacks
-	lastPingTime        time.Time
+	lastPingTime        atomicTime
 	autoReconnect       bool
 	reconnectMaxRetries int
 	reconnectMaxDelay   time.Duration
@@ -41,6 +42,22 @@ type Ticker struct {
 	cancel context.CancelFunc
 }
 
+// atomicTime is wrapper over time.Time to safely access
+// an updating timestamp concurrently.
+type atomicTime struct {
+	v atomic.Value
+}
+
+// Get returns the current timestamp.
+func (b *atomicTime) Get() time.Time {
+	return b.v.Load().(time.Time)
+}
+
+// Set sets the current timestamp.
+func (b *atomicTime) Set(value time.Time) {
+	b.v.Store(value)
+}
+
 // callbacks represents callbacks available in ticker.
 type callbacks struct {
 	onTick        func(models.Tick)
@@ -311,7 +328,7 @@ func (t *Ticker) ServeWithContext(ctx context.Context) {
 			t.reconnectAttempt = 0
 
 			// Set current time as last ping time
-			t.lastPingTime = time.Now()
+			t.lastPingTime.Set(time.Now())
 
 			// Set on close handler
 			t.Conn.SetCloseHandler(t.handleClose)
@@ -339,6 +356,7 @@ func (t *Ticker) handleClose(code int, reason string) error {
 	return nil
 }
 
+
 // Trigger callback methods
 func (t *Ticker) triggerError(err error) {
 	if t.callbacks.onError != nil {
@@ -370,6 +388,7 @@ func (t *Ticker) triggerNoReconnect(attempt int) {
 	}
 }
 
+
 func (t *Ticker) triggerMessage(messageType int, message []byte) {
 	if t.callbacks.onMessage != nil {
 		t.callbacks.onMessage(messageType, message)
@@ -401,7 +420,7 @@ func (t *Ticker) checkConnection(ctx context.Context, wg *sync.WaitGroup) {
 
 			// If last ping time is greater then timeout interval then close the
 			// existing connection and reconnect
-			if time.Since(t.lastPingTime) > dataTimeoutInterval {
+			if time.Since(t.lastPingTime.Get()) > dataTimeoutInterval {
 				// Close the current connection without waiting for close frame
 				if t.Conn != nil {
 					t.Conn.Close()
@@ -431,7 +450,7 @@ func (t *Ticker) readMessage(ctx context.Context, wg *sync.WaitGroup) {
 			}
 
 			// Update last ping time to check for connection
-			t.lastPingTime = time.Now()
+			t.lastPingTime.Set(time.Now())
 
 			// Trigger message.
 			t.triggerMessage(mType, msg)