More graceful Tile38 shutdown

internal/endpoint/amqp.go

@@ -27,13 +27,21 @@ func (conn *AMQPConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > amqpExpiresAfter {
-			conn.ex = true
 			conn.close()
+			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *AMQPConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *AMQPConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/disque.go

@@ -33,15 +33,21 @@ func (conn *DisqueConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > disqueExpiresAfter {
-			if conn.conn != nil {
 			conn.close()
-			}
 			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *DisqueConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *DisqueConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/endpoint.go

@@ -6,6 +6,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/streadway/amqp"
@@ -136,6 +137,7 @@ type Endpoint struct {
 
 // Conn is an endpoint connection
 type Conn interface {
+	ExpireNow()
 	Expired() bool
 	Send(val string) error
 }
@@ -145,6 +147,8 @@ type Manager struct {
 	mu        sync.RWMutex
 	conns     map[string]Conn
 	publisher LocalPublisher
+	shutdown  int32          // atomic bool
+	wg        sync.WaitGroup // run wait group
 }
 
 // NewManager returns a new manager
@@ -153,13 +157,29 @@ func NewManager(publisher LocalPublisher) *Manager {
 		conns:     make(map[string]Conn),
 		publisher: publisher,
 	}
-	go epc.Run()
+	epc.wg.Add(1)
+	go epc.run()
 	return epc
 }
 
+func (epc *Manager) Shutdown() {
+	defer epc.wg.Wait()
+	atomic.StoreInt32(&epc.shutdown, 1)
+	// expire the connections
+	epc.mu.Lock()
+	defer epc.mu.Unlock()
+	for _, conn := range epc.conns {
+		conn.ExpireNow()
+	}
+}
+
 // Run starts the managing of endpoints
-func (epc *Manager) Run() {
+func (epc *Manager) run() {
+	defer epc.wg.Done()
 	for {
+		if atomic.LoadInt32(&epc.shutdown) != 0 {
+			return
+		}
 		time.Sleep(time.Second)
 		func() {
 			epc.mu.Lock()

internal/endpoint/eventHub.go

@@ -28,6 +28,10 @@ func (conn *EvenHubConn) Expired() bool {
 	return false
 }
 
+// ExpireNow forces the connection to expire
+func (conn *EvenHubConn) ExpireNow() {
+}
+
 // Send sends a message
 func (conn *EvenHubConn) Send(msg string) error {
 	hub, err := eventhub.NewHubFromConnectionString(conn.ep.EventHub.ConnectionString)

internal/endpoint/grpc.go

@@ -36,14 +36,21 @@ func (conn *GRPCConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > grpcExpiresAfter {
-			if conn.conn != nil {
 			conn.close()
-			}
 			conn.ex = true
 		}
 	}
 	return conn.ex
 }
+
+// ExpireNow forces the connection to expire
+func (conn *GRPCConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *GRPCConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/http.go

@@ -38,6 +38,10 @@ func (conn *HTTPConn) Expired() bool {
 	return false
 }
 
+// ExpireNow forces the connection to expire
+func (conn *HTTPConn) ExpireNow() {
+}
+
 // Send sends a message
 func (conn *HTTPConn) Send(msg string) error {
 	req, err := http.NewRequest("POST", conn.ep.Original, bytes.NewBufferString(msg))

internal/endpoint/kafka.go

@@ -34,15 +34,21 @@ func (conn *KafkaConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > kafkaExpiresAfter {
-			if conn.conn != nil {
 			conn.close()
-			}
 			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *KafkaConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *KafkaConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/local.go

@@ -23,6 +23,10 @@ func (conn *LocalConn) Expired() bool {
 	return false
 }
 
+// ExpireNow forces the connection to expire
+func (conn *LocalConn) ExpireNow() {
+}
+
 // Send sends a message
 func (conn *LocalConn) Send(msg string) error {
 	conn.publisher.Publish(conn.ep.Local.Channel, msg)

internal/endpoint/mqtt.go

@@ -40,12 +40,19 @@ func (conn *MQTTConn) Expired() bool {
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *MQTTConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *MQTTConn) close() {
 	if conn.conn != nil {
 		if conn.conn.IsConnected() {
 			conn.conn.Disconnect(250)
 		}
-
 		conn.conn = nil
 	}
 }

internal/endpoint/nats.go

@@ -32,15 +32,21 @@ func (conn *NATSConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > natsExpiresAfter {
-			if conn.conn != nil {
 			conn.close()
-			}
 			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *NATSConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *NATSConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/pubsub.go

@@ -83,13 +83,21 @@ func (conn *PubSubConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > pubsubExpiresAfter {
-			conn.ex = true
 			conn.close()
+			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *PubSubConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func newPubSubConn(ep Endpoint) *PubSubConn {
 	return &PubSubConn{
 		ep: ep,

internal/endpoint/redis.go

@@ -32,15 +32,21 @@ func (conn *RedisConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > redisExpiresAfter {
-			if conn.conn != nil {
 			conn.close()
-			}
 			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *RedisConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *RedisConn) close() {
 	if conn.conn != nil {
 		conn.conn.Close()

internal/endpoint/sqs.go

@@ -39,13 +39,21 @@ func (conn *SQSConn) Expired() bool {
 	defer conn.mu.Unlock()
 	if !conn.ex {
 		if time.Since(conn.t) > sqsExpiresAfter {
-			conn.ex = true
 			conn.close()
+			conn.ex = true
 		}
 	}
 	return conn.ex
 }
 
+// ExpireNow forces the connection to expire
+func (conn *SQSConn) ExpireNow() {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	conn.close()
+	conn.ex = true
+}
+
 func (conn *SQSConn) close() {
 	if conn.svc != nil {
 		conn.svc = nil

internal/server/expire.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"sync"
 	"time"
 
 	"github.com/tidwall/tile38/internal/collection"
@@ -12,20 +13,15 @@ const bgExpireDelay = time.Second / 10
 
 // backgroundExpiring deletes expired items from the database.
 // It's executes every 1/10 of a second.
-func (s *Server) backgroundExpiring() {
+func (s *Server) backgroundExpiring(wg *sync.WaitGroup) {
-	for {
+	defer wg.Done()
-		if s.stopServer.on() {
+	s.loopUntilServerStops(bgExpireDelay, func() {
-			return
-		}
-		func() {
 		s.mu.Lock()
 		defer s.mu.Unlock()
 		now := time.Now()
 		s.backgroundExpireObjects(now)
 		s.backgroundExpireHooks(now)
-		}()
+	})
-		time.Sleep(bgExpireDelay)
-	}
 }
 
 func (s *Server) backgroundExpireObjects(now time.Time) {

internal/server/live.go

@@ -21,10 +21,16 @@ type liveBuffer struct {
 	cond    *sync.Cond
 }
 
-func (s *Server) processLives() {
+func (s *Server) processLives(wg *sync.WaitGroup) {
-	defer s.lwait.Done()
+	defer wg.Done()
+	var done abool
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		for {
+			if done.on() {
+				break
+			}
 			s.lcond.Broadcast()
 			time.Sleep(time.Second / 4)
 		}
@@ -33,6 +39,7 @@ func (s *Server) processLives() {
 	defer s.lcond.L.Unlock()
 	for {
 		if s.stopServer.on() {
+			done.set(true)
 			return
 		}
 		for len(s.lstack) > 0 {

internal/server/server.go

@@ -79,6 +79,7 @@ type Server struct {
 	started time.Time
 	config  *Config
 	epc     *endpoint.Manager
+	ln      net.Listener // server listener
 
 	// env opts
 	geomParseOpts geojson.ParseOptions
@@ -114,7 +115,6 @@ type Server struct {
 	lstack       []*commandDetails
 	lives        map[*liveBuffer]bool
 	lcond        *sync.Cond
-	lwait        sync.WaitGroup
 	fcup         bool         // follow caught up
 	fcuponce     bool         // follow caught up once
 	shrinking    bool         // aof shrinking flag
@@ -165,6 +165,9 @@ type Options struct {
 
 	// QueueFileName allows for custom queue.db file path
 	QueueFileName string
+
+	// Shutdown allows for shutting down the server.
+	Shutdown <-chan bool
 }
 
 // Serve starts a new tile38 server
@@ -180,6 +183,15 @@ func Serve(opts Options) error {
 	}
 
 	log.Infof("Server started, Tile38 version %s, git %s", core.Version, core.GitSHA)
+	defer func() {
+		log.Warn("Server has shutdown, bye now")
+		if false {
+			// prints the stack, looking for running goroutines.
+			buf := make([]byte, 10000)
+			n := runtime.Stack(buf, true)
+			println(string(buf[:n]))
+		}
+	}()
 
 	// Initialize the s
 	s := &Server{
@@ -210,6 +222,7 @@ func Serve(opts Options) error {
 	}
 
 	s.epc = endpoint.NewManager(s)
+	defer s.epc.Shutdown()
 	s.luascripts = s.newScriptMap()
 	s.luapool = s.newPool()
 	defer s.luapool.Shutdown()
@@ -279,6 +292,13 @@ func Serve(opts Options) error {
 		nerr <- s.netServe()
 	}()
 
+	go func() {
+		<-opts.Shutdown
+		s.stopServer.set(true)
+		log.Warnf("Shutting down...")
+		s.ln.Close()
+	}()
+
 	// Load the queue before the aof
 	qdb, err := buntdb.Open(opts.QueueFileName)
 	if err != nil {
@@ -324,32 +344,60 @@ func Serve(opts Options) error {
 	}
 
 	// Start background routines
-	if s.config.followHost() != "" {
+	var bgwg sync.WaitGroup
-		go s.follow(s.config.followHost(), s.config.followPort(),
-			s.followc.get())
-	}
 
-	if opts.MetricsAddr != "" {
+	if s.config.followHost() != "" {
-		log.Infof("Listening for metrics at: %s", opts.MetricsAddr)
+		bgwg.Add(1)
 		go func() {
-			http.HandleFunc("/", s.MetricsIndexHandler)
+			defer bgwg.Done()
-			http.HandleFunc("/metrics", s.MetricsHandler)
+			s.follow(s.config.followHost(), s.config.followPort(),
-			log.Fatal(http.ListenAndServe(opts.MetricsAddr, nil))
+				s.followc.get())
 		}()
 	}
 
-	s.lwait.Add(1)
+	var mln net.Listener
-	go s.processLives()
+	if opts.MetricsAddr != "" {
-	go s.watchOutOfMemory()
+		log.Infof("Listening for metrics at: %s", opts.MetricsAddr)
-	go s.watchLuaStatePool()
+		mln, err = net.Listen("tcp", opts.MetricsAddr)
-	go s.watchAutoGC()
+		if err != nil {
-	go s.backgroundExpiring()
+			return err
-	go s.backgroundSyncAOF()
+		}
+		bgwg.Add(1)
+		go func() {
+			defer bgwg.Done()
+			smux := http.NewServeMux()
+			smux.HandleFunc("/", s.MetricsIndexHandler)
+			smux.HandleFunc("/metrics", s.MetricsHandler)
+			err := http.Serve(mln, smux)
+			if err != nil {
+				if !s.stopServer.on() {
+					log.Fatalf("metrics server: %s", err)
+				}
+			}
+		}()
+	}
+
+	bgwg.Add(1)
+	go s.processLives(&bgwg)
+	bgwg.Add(1)
+	go s.watchOutOfMemory(&bgwg)
+	bgwg.Add(1)
+	go s.watchLuaStatePool(&bgwg)
+	bgwg.Add(1)
+	go s.watchAutoGC(&bgwg)
+	bgwg.Add(1)
+	go s.backgroundExpiring(&bgwg)
+	bgwg.Add(1)
+	go s.backgroundSyncAOF(&bgwg)
 	defer func() {
+		log.Debug("Stopping background routines")
 		// Stop background routines
 		s.followc.add(1) // this will force any follow communication to die
 		s.stopServer.set(true)
-		s.lwait.Wait()
+		if mln != nil {
+			mln.Close() // Stop the metrics server
+		}
+		bgwg.Wait()
 	}()
 
 	// Server is now loaded and ready. Wait for network error messages.
@@ -384,16 +432,37 @@ func (s *Server) netServe() error {
 	if err != nil {
 		return err
 	}
-	defer ln.Close()
+
+	var wg sync.WaitGroup
+	defer func() {
+		log.Debug("Closing client connections...")
+		s.connsmu.RLock()
+		for _, c := range s.conns {
+			c.closer.Close()
+		}
+		s.connsmu.RUnlock()
+		wg.Wait()
+		ln.Close()
+		log.Debug("Client connection closed")
+	}()
+	s.ln = ln
+
 	log.Infof("Ready to accept connections at %s", ln.Addr())
 	var clientID int64
 	for {
 		conn, err := ln.Accept()
 		if err != nil {
-			return err
+			if s.stopServer.on() {
+				return nil
 			}
-
+			log.Warn(err)
+			time.Sleep(time.Second / 5)
+			continue
+		}
+		wg.Add(1)
 		go func(conn net.Conn) {
+			defer wg.Done()
+
 			// open connection
 			// create the client
 			client := new(Client)
@@ -617,20 +686,16 @@ func (conn *liveConn) SetWriteDeadline(deadline time.Time) error {
 	panic("not supported")
 }
 
-func (s *Server) watchAutoGC() {
+func (s *Server) watchAutoGC(wg *sync.WaitGroup) {
-	t := time.NewTicker(time.Second)
+	defer wg.Done()
-	defer t.Stop()
 	start := time.Now()
-	for range t.C {
+	s.loopUntilServerStops(time.Second, func() {
-		if s.stopServer.on() {
-			return
-		}
 		autoGC := s.config.autoGC()
 		if autoGC == 0 {
-			continue
+			return
 		}
 		if time.Since(start) < time.Second*time.Duration(autoGC) {
-			continue
+			return
 		}
 		var mem1, mem2 runtime.MemStats
 		runtime.ReadMemStats(&mem1)
@@ -645,7 +710,7 @@ func (s *Server) watchAutoGC() {
 			"alloc: %v, heap_alloc: %v, heap_released: %v",
 			mem2.Alloc, mem2.HeapAlloc, mem2.HeapReleased)
 		start = time.Now()
-	}
+	})
 }
 
 func (s *Server) checkOutOfMemory() {
@@ -667,38 +732,43 @@ func (s *Server) checkOutOfMemory() {
 	s.outOfMemory.set(int(mem.HeapAlloc) > s.config.maxMemory())
 }
 
-func (s *Server) watchOutOfMemory() {
+func (s *Server) loopUntilServerStops(dur time.Duration, op func()) {
-	t := time.NewTicker(time.Second * 2)
+	var last time.Time
-	defer t.Stop()
+	for {
-	for range t.C {
-		s.checkOutOfMemory()
-	}
-}
-
-func (s *Server) watchLuaStatePool() {
-	t := time.NewTicker(time.Second * 10)
-	defer t.Stop()
-	for range t.C {
-		func() {
-			s.luapool.Prune()
-		}()
-	}
-}
-
-// backgroundSyncAOF ensures that the aof buffer is does not grow too big.
-func (s *Server) backgroundSyncAOF() {
-	t := time.NewTicker(time.Second)
-	defer t.Stop()
-	for range t.C {
 		if s.stopServer.on() {
 			return
 		}
-		func() {
+		now := time.Now()
+		if now.Sub(last) > dur {
+			op()
+			last = now
+		}
+		time.Sleep(time.Second / 5)
+	}
+}
+
+func (s *Server) watchOutOfMemory(wg *sync.WaitGroup) {
+	defer wg.Done()
+	s.loopUntilServerStops(time.Second*4, func() {
+		s.checkOutOfMemory()
+	})
+}
+
+func (s *Server) watchLuaStatePool(wg *sync.WaitGroup) {
+	defer wg.Done()
+	s.loopUntilServerStops(time.Second*10, func() {
+		s.luapool.Prune()
+	})
+}
+
+// backgroundSyncAOF ensures that the aof buffer is does not grow too big.
+func (s *Server) backgroundSyncAOF(wg *sync.WaitGroup) {
+	defer wg.Done()
+	s.loopUntilServerStops(time.Second, func() {
 		s.mu.Lock()
 		defer s.mu.Unlock()
 		s.flushAOF(true)
-		}()
+	})
-	}
 }
 
 func isReservedFieldName(field string) bool {

scripts/test.sh

@@ -9,9 +9,8 @@ cd tests
 go test -coverpkg=../internal/server -coverprofile=/tmp/coverage.out $GOTEST
 
 
-# go test \
+# go test -coverpkg=../internal/... -coverprofile=/tmp/coverage.out \
-#     -coverpkg=../internal/... -coverprofile=/tmp/coverage.out \
+#     -v ./... $GOTEST
-#     -v . -v ../... $GOTEST 
 
 go tool cover -html=/tmp/coverage.out -o /tmp/coverage.html
 echo "details: file:///tmp/coverage.html"

tests/mock_test.go

@@ -39,6 +39,7 @@ type mockServer struct {
 	conn     redis.Conn
 	ioJSON   bool
 	dir      string
+	shutdown chan bool
 }
 
 func (mc *mockServer) readAOF() ([]byte, error) {
@@ -71,8 +72,10 @@ func mockOpenServer(opts MockServerOptions) (*mockServer, error) {
 	logOutput := io.Discard
 	if os.Getenv("PRINTLOG") == "1" {
 		logOutput = os.Stderr
+		tlog.Level = 3
 	}
-	s := &mockServer{port: port, dir: dir}
+	shutdown := make(chan bool)
+	s := &mockServer{port: port, dir: dir, shutdown: shutdown}
 	tlog.SetOutput(logOutput)
 	var ferrt int32 // atomic flag for when ferr has been set
 	var ferr error  // ferr for when the server fails to start
@@ -84,11 +87,14 @@ func mockOpenServer(opts MockServerOptions) (*mockServer, error) {
 			UseHTTP:           true,
 			DevMode:           true,
 			AppendOnly:        true,
+			Shutdown:          shutdown,
+			ShowDebugMessages: true,
 		}
 		if opts.Metrics {
 			sopts.MetricsAddr = ":4321"
 		}
-		if err := server.Serve(sopts); err != nil {
+		err := server.Serve(sopts)
+		if err != nil {
 			ferr = err
 			atomic.StoreInt32(&ferrt, 1)
 		}
@@ -133,6 +139,7 @@ func (s *mockServer) waitForStartup(ferr *error, ferrt *int32) error {
 }
 
 func (mc *mockServer) Close() {
+	mc.shutdown <- true
 	if mc.conn != nil {
 		mc.conn.Close()
 	}

tests/tests_test.go

@@ -26,6 +26,18 @@ const (
 	white   = "\x1b[37m"
 )
 
+// type mockTest struct {
+// }
+
+// func mockTestInit() *mockTest {
+// 	mt := &mockTest{}
+// 	return mt
+// }
+
+// func (mt *mockTest) Cleanup() {
+
+// }
+
 func TestAll(t *testing.T) {
 	mockCleanup(false)
 	defer mockCleanup(false)
@@ -45,6 +57,8 @@ func TestAll(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	// log.Printf("Waiting a second for everything to cleanly start...")
+	// time.Sleep(time.Second * 2)
 	defer mc.Close()
 
 	runSubTest(t, "keys", mc, subTestKeys)