From 011c3d398d1d6a798659c1b3e517c1a7a619cae6 Mon Sep 17 00:00:00 2001
From: Jeff Haynie <jhaynie@pinpoint.com>
Date: Sat, 27 Jun 2020 12:55:27 -0500
Subject: [PATCH] remove ping code

---
 event/event.go | 53 +-------------------------------------------------
 1 file changed, 1 insertion(+), 52 deletions(-)

diff --git a/event/event.go b/event/event.go
index a3434a3..a173e7c 100644
--- a/event/event.go
+++ b/event/event.go
@@ -413,7 +413,6 @@ func (c *SubscriptionChannel) Close() error {
 		}
 		close(c.done)
 		close(c.ch)
-		c.checkLastPingsStop()
 	}
 	return nil
 }
@@ -430,45 +429,6 @@ var defaultInsecureWSDialer = &websocket.Dialer{
 	EnableCompression: true,
 }
 
-func (c *SubscriptionChannel) pingReceived() {
-	c.lastPingMu.Lock()
-	c.lastPing = time.Now()
-	c.lastPingMu.Unlock()
-}
-
-const expectedDurationBetweenPings = 30 * time.Second
-
-func (c *SubscriptionChannel) checkLastPingsInit() {
-	c.pingReceived() // make initial checks right
-	c.lastPingTimer = time.NewTicker(expectedDurationBetweenPings)
-	c.lastPingsDone = make(chan bool)
-}
-
-func (c *SubscriptionChannel) checkLastPingsLoop() {
-	for {
-		select {
-		case <-c.lastPingsDone:
-			return
-		case <-c.lastPingTimer.C:
-			c.lastPingMu.Lock()
-			lastPing := c.lastPing
-			c.lastPingMu.Unlock()
-			// crash if 5 last pings were missed
-			// would be better to retry subscription, but can't figure out how to do this cleanly here, since it would be blocked on wch.ReadJSON()
-			if time.Since(lastPing) > 5*expectedDurationBetweenPings {
-				panic(fmt.Errorf("no pings received for %v, expecting pings every %v", time.Since(lastPing), expectedDurationBetweenPings))
-			}
-		}
-	}
-}
-
-func (c *SubscriptionChannel) checkLastPingsStop() {
-	if c.lastPingTimer != nil {
-		c.lastPingTimer.Stop()
-		c.lastPingsDone <- true
-	}
-}
-
 // Publish will send a message to the event api
 func (c *SubscriptionChannel) Publish(event PublishEvent, options ...Option) error {
 	ts := time.Now()
@@ -659,12 +619,6 @@ func (c *SubscriptionChannel) run() {
 		c.mu.Unlock()
 		log.Debug(c.subscription.Logger, "connected")
 
-		pinghandler := wch.PingHandler()
-		wch.SetPingHandler(func(data string) error {
-			c.pingReceived()
-			return pinghandler(data)
-		})
-
 		var subid string
 
 		if len(c.subscription.Topics) > 0 {
@@ -695,11 +649,6 @@ func (c *SubscriptionChannel) run() {
 			c.mu.Unlock()
 		}
 
-		if !c.subscription.DisablePing {
-			c.checkLastPingsInit() // have it separately to avoid races with Close
-			go c.checkLastPingsLoop()
-		}
-
 		errors = 0
 		var errored bool
 		var closed bool
@@ -862,7 +811,7 @@ type Subscription struct {
 	HTTPHeaders       map[string]string   `json:"-"`
 	CloseTimeout      time.Duration       `json:"-"`
 	DispatchTimeout   time.Duration       `json:"-"`
-	DisablePing       bool                `json:"-"`
+	DisablePing       bool                `json:"-"` // Deprecated
 }
 
 // NewSubscription will create a subscription to the event server and will continously read events (as they arrive)