From 2f96652bb408e65c205317403d749ba9a395c6bb Mon Sep 17 00:00:00 2001
From: zelig <viktor.tron@gmail.com>
Date: Thu, 26 Jun 2014 10:47:45 +0100
Subject: [PATCH] interrupt handlers now ordered

---
 ethereal/main.go | 12 ++++++++----
 ethereum/cmd.go  |  1 -
 ethereum/main.go |  2 ++
 utils/cmd.go     | 25 ++++++++++++++-----------
 4 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/ethereal/main.go b/ethereal/main.go
index 10571be7b..5dfab4c45 100644
--- a/ethereal/main.go
+++ b/ethereal/main.go
@@ -8,10 +8,12 @@ import (
 )
 
 func main() {
-	qml.Init(nil)
-
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
+	utils.HandleInterrupt()
+
+	qml.Init(nil)
+
 	// precedence: code-internal flag default < config file < environment variables < command line
 	Init() // parsing command line
 	utils.InitConfig(ConfigFile, Datadir, Identifier, "ETH")
@@ -33,8 +35,10 @@ func main() {
 		utils.StartRpc(ethereum, RpcPort)
 	}
 
-	utils.StartEthereum(ethereum, UseSeed)
-
 	gui := ethui.New(ethereum, LogLevel)
 	gui.Start(AssetPath)
+
+	utils.StartEthereum(ethereum, UseSeed)
+
+
 }
diff --git a/ethereum/cmd.go b/ethereum/cmd.go
index 0e9c2be8c..2dfd54666 100644
--- a/ethereum/cmd.go
+++ b/ethereum/cmd.go
@@ -12,7 +12,6 @@ func InitJsConsole(ethereum *eth.Ethereum) {
   go repl.Start()
   utils.RegisterInterrupt(func(os.Signal) {
     repl.Stop()
-    ethereum.Stop()
   })
 }
 
diff --git a/ethereum/main.go b/ethereum/main.go
index bbbaf5541..800486e56 100644
--- a/ethereum/main.go
+++ b/ethereum/main.go
@@ -11,6 +11,8 @@ var logger = ethlog.NewLogger("CLI")
 func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
+	utils.HandleInterrupt()
+
 	// precedence: code-internal flag default < config file < environment variables < command line
 	Init() // parsing command line
 	utils.InitConfig(ConfigFile, Datadir, Identifier, "ETH")
diff --git a/utils/cmd.go b/utils/cmd.go
index 34716b94a..da05c6d83 100644
--- a/utils/cmd.go
+++ b/utils/cmd.go
@@ -18,16 +18,23 @@ import (
 )
 
 var logger = ethlog.NewLogger("CLI")
+var interruptCallbacks = []func(os.Signal){}
 
-// Register interrupt handlers
+// Register interrupt handlers callbacks
 func RegisterInterrupt(cb func(os.Signal)) {
+  interruptCallbacks = append(interruptCallbacks, cb)
+}
+
+// go routine that call interrupt handlers in order of registering
+func HandleInterrupt() {
+  c := make(chan os.Signal, 1)
   go func() {
-    // Buffered chan of one is enough
-    c := make(chan os.Signal, 1)
-    // Notify about interrupts for now
     signal.Notify(c, os.Interrupt)
     for sig := range c {
-      cb(sig)
+      logger.Errorf("Shutting down (%v) ... \n", sig)
+      for _, cb := range interruptCallbacks {
+        cb(sig)
+      }
     }
   }()
 }
@@ -109,13 +116,12 @@ func NewEthereum(UseUPnP bool, OutboundPort string, MaxPeer int) *eth.Ethereum {
 func StartEthereum(ethereum *eth.Ethereum, UseSeed bool) {
   logger.Infof("Starting Ethereum v%s", ethutil.Config.Ver)
   ethereum.Start(UseSeed)
-  // Wait for shutdown
-  ethereum.WaitForShutdown()
   RegisterInterrupt(func(sig os.Signal) {
-    logger.Errorf("Shutting down (%v) ... \n", sig)
     ethereum.Stop()
     ethlog.Flush()
   })
+  // this blocks the thread
+  ethereum.WaitForShutdown()
 }
 
 func ShowGenesis(ethereum *eth.Ethereum) {
@@ -174,9 +180,6 @@ func StartRpc(ethereum *eth.Ethereum, RpcPort int) {
     logger.Errorf("Could not start RPC interface (port %v): %v", RpcPort, err)
   } else {
     go ethereum.RpcServer.Start()
-    RegisterInterrupt(func(os.Signal) {
-      ethereum.RpcServer.Stop()
-    })
   }
 }