From fac248d94b70d58ff54c6be3e4bbfa6c514e142e Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Tue, 7 Jan 2020 00:20:51 +0100
Subject: [PATCH] Mind latest retain value: Clear retained value

---
 handler.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/handler.go b/handler.go
index c0b11ec..193f5a2 100644
--- a/handler.go
+++ b/handler.go
@@ -103,11 +103,13 @@ func handleMapSubmit(w http.ResponseWriter, r *http.Request) {
 
 	pos.Time = time.Now()
 
+	reqRetainerLock.Lock()
 	if pos.Retained {
-		reqRetainerLock.Lock()
 		reqRetainer[mapID] = pos
-		reqRetainerLock.Unlock()
+	} else {
+		delete(reqRetainer, mapID)
 	}
+	reqRetainerLock.Unlock()
 
 	reqDistributorsLock.RLock()
 	defer reqDistributorsLock.RUnlock()