From 479ed3f97417d95f19491931d20e696f79f62cc9 Mon Sep 17 00:00:00 2001
From: Guilherme Salazar <gsz@acm.org>
Date: Fri, 10 Jan 2020 21:00:44 -0800
Subject: [PATCH] feat(*) exit if parent died

Run a goroutine every minute to check if parent died and exit.
Assumption: if parent dies, the process gets adopted by init (pid 1).
---
 main.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/main.go b/main.go
index 321da09..583b7a0 100644
--- a/main.go
+++ b/main.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"reflect"
 	"fmt"
+	"time"
 )
 
 var version = "development"
@@ -99,6 +100,10 @@ func startServer() {
 	runServer(listener)
 }
 
+func isParentAlive() bool {
+	return os.Getppid() != 1 // assume ppid 1 means process was adopted by init
+}
+
 func main() {
 	if *showVersion == true {
 		printVersion()
@@ -111,6 +116,17 @@ func main() {
 	}
 
 	if socket != "" {
+		go func() {
+			for {
+				if ! isParentAlive() {
+					log.Printf("Kong exited; shutting down...")
+					os.Exit(0)
+				}
+
+				time.Sleep(1 * time.Second)
+			}
+		}()
+
 		startServer()
 	}
 }