Handle shutdown better

account.go

@@ -130,6 +130,7 @@ func RemoveAccount(mxUser string, name string) {
 
 func CloseAllAcountsForShutdown() {
 	accountsLock.Lock()
+	defer accountsLock.Unlock()
 	for _, accl := range registeredAccounts {
 		for _, acct := range accl {
 			acct.Conn.Close()

connector/external/external.go

@@ -79,8 +79,8 @@ type External struct {
 
 	config Configuration
 
-	recv     io.Reader
+	recvPipe io.ReadCloser
-	send     io.Writer
+	sendPipe io.WriteCloser
 	sendJson *json.Encoder
 
 	generation int
@@ -114,7 +114,7 @@ func (ext *External) Configure(c Configuration) error {
 	ext.handlerChan = make(chan *extMessageWithData, 1000)
 	go ext.handlerLoop(ext.generation)
 
-	err = ext.setupProc()
+	err = ext.setupProc(ext.generation)
 	if err != nil {
 		return err
 	}
@@ -133,26 +133,28 @@ func (ext *External) Configure(c Configuration) error {
 
 // ---- Process management and communication logic
 
-func (ext *External) setupProc() error {
+func (ext *External) setupProc(generation int) error {
 	var err error
 
 	ext.proc = exec.Command(ext.command)
 
-	ext.recv, err = ext.proc.StdoutPipe()
+	ext.recvPipe, err = ext.proc.StdoutPipe()
 	if err != nil {
 		return err
 	}
-	ext.send, err = ext.proc.StdinPipe()
+	ext.sendPipe, err = ext.proc.StdinPipe()
 	if err != nil {
 		return err
 	}
 
+	send := io.Writer(ext.sendPipe)
+	recv := io.Reader(ext.recvPipe)
 	if ext.debug {
-		ext.recv = io.TeeReader(ext.recv, os.Stderr)
+		recv = io.TeeReader(recv, os.Stderr)
-		ext.send = io.MultiWriter(ext.send, os.Stderr)
+		send = io.MultiWriter(send, os.Stderr)
 	}
 
-	ext.sendJson = json.NewEncoder(ext.send)
+	ext.sendJson = json.NewEncoder(send)
 
 	ext.proc.Stderr = os.Stderr
 
@@ -161,7 +163,7 @@ func (ext *External) setupProc() error {
 		return err
 	}
 
-	go ext.recvLoop()
+	go ext.recvLoop(recv, generation)
 	return nil
 }
 
@@ -175,7 +177,7 @@ func (ext *External) restartLoop(generation int) {
 			break
 		}
 		log.Printf("Process %s stopped, restarting.", ext.command)
-		err := ext.setupProc()
+		err := ext.setupProc(generation)
 		if err != nil {
 			ext.proc = nil
 			log.Warnf("Unable to restart %s: %s", ext.command, err)
@@ -232,8 +234,8 @@ func (m *extMessageWithData) UnmarshalJSON(jj []byte) error {
 
 }
 
-func (ext *External) recvLoop() {
+func (ext *External) recvLoop(from io.Reader, generation int) {
-	scanner := bufio.NewScanner(ext.recv)
+	scanner := bufio.NewScanner(from)
 	for scanner.Scan() {
 		var msg extMessageWithData
 		err := json.Unmarshal(scanner.Bytes(), &msg)
@@ -260,6 +262,10 @@ func (ext *External) recvLoop() {
 		} else {
 			ext.handlerChan <- &msg
 		}
+
+		if ext.generation != generation {
+			break
+		}
 	}
 }
 
@@ -315,20 +321,25 @@ func (ext *External) cmd(msg extMessage, data interface{}) (*extMessageWithData,
 }
 
 func (ext *External) Close() {
+	ext.generation += 1
+
 	ext.sendJson.Encode(&extMessage{
 		MsgType: CLOSE,
 	})
-	ext.generation += 1
 
 	proc := ext.proc
+	proc.Process.Signal(os.Interrupt)
+	ext.recvPipe.Close()
+	ext.sendPipe.Close()
+
 	ext.proc = nil
-	ext.recv = nil
+	ext.recvPipe = nil
-	ext.send = nil
+	ext.sendPipe = nil
 	ext.sendJson = nil
 	ext.handlerChan = nil
 
 	go func() {
-		time.Sleep(10 * time.Second)
+		time.Sleep(1 * time.Second)
 		proc.Process.Kill()
 	}()
 }

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"crypto/rand"
 	"encoding/hex"
 	"encoding/json"
@@ -9,6 +10,7 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v2"
@@ -179,12 +181,12 @@ func main() {
 	sigch := make(chan os.Signal)
 	signal.Notify(sigch, os.Interrupt, syscall.SIGTERM)
 
-	err = StartAppService(errch)
+	as_server, err := StartAppService(errch)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	StartWeb(errch)
+	web_server := StartWeb(errch)
 
 	// Wait for an error somewhere or interrupt signal
 	select {
@@ -196,6 +198,22 @@ func main() {
 		log.Warnf("Got signal %s", sig.String())
 	}
 
+	// Shut down, hopefully this is not a too bad way to do it
 	log.Warn("Shuttind down")
+	delay := 2 * time.Second
+
+	ctx1, _ := context.WithTimeout(context.TODO(), delay)
+	go as_server.Shutdown(ctx1)
+
+	ctx2, _ := context.WithTimeout(context.TODO(), delay)
+	go web_server.Shutdown(ctx2)
+
+	time.Sleep(delay)
 	CloseAllAcountsForShutdown()
+
+	if err != nil {
+		os.Exit(1)
+	} else {
+		os.Exit(0)
+	}
 }

server.go

@@ -16,18 +16,18 @@ import (
 
 var mx *mxlib.Client
 
-func StartAppService(errch chan error) error {
+func StartAppService(errch chan error) (*http.Server, error) {
 	mx = mxlib.NewClient(config.Server, registration.AsToken)
 
 	err := InitDb()
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	if dbKvGet("ezbr_initialized") != "yes" {
 		err = mx.RegisterUser(registration.SenderLocalpart)
 		if mxe, ok := err.(*mxlib.MxError); !ok || mxe.ErrCode != "M_USER_IN_USE" {
-			return err
+			return nil, err
 		}
 
 		_, st := os.Stat(config.AvatarFile)
@@ -36,13 +36,13 @@ func StartAppService(errch chan error) error {
 				Path: config.AvatarFile,
 			})
 			if err != nil {
-				return err
+				return nil, err
 			}
 		}
 
 		err = mx.ProfileDisplayname(ezbrMxId(), fmt.Sprintf("Easybridge (%s)", EASYBRIDGE_SYSTEM_PROTOCOL))
 		if err != nil {
-			return err
+			return nil, err
 		}
 
 		dbKvPut("ezbr_initialized", "yes")
@@ -52,9 +52,13 @@ func StartAppService(errch chan error) error {
 	router.HandleFunc("/_matrix/app/v1/transactions/{txnId}", handleTxn)
 	router.HandleFunc("/transactions/{txnId}", handleTxn)
 
+	log.Printf("Starting HTTP server on %s", config.ASBindAddr)
+	http_server := &http.Server{
+		Addr:    config.ASBindAddr,
+		Handler: checkTokenAndLog(router),
+	}
 	go func() {
-		log.Printf("Starting HTTP server on %s", config.ASBindAddr)
+		err := http_server.ListenAndServe()
-		err := http.ListenAndServe(config.ASBindAddr, checkTokenAndLog(router))
 		if err != nil {
 			errch <- err
 		}
@@ -71,7 +75,7 @@ func StartAppService(errch chan error) error {
 		}
 	}()
 
-	return nil
+	return http_server, nil
 }
 
 func checkTokenAndLog(handler http.Handler) http.Handler {

web.go

@@ -21,7 +21,7 @@ const SESSION_NAME = "easybridge_session"
 var sessionsStore sessions.Store = nil
 var userKeys = map[string]*[32]byte{}
 
-func StartWeb(errch chan error) {
+func StartWeb(errch chan error) *http.Server {
 	session_key := blake2b.Sum256([]byte(config.SessionKey))
 	sessionsStore = sessions.NewCookieStore(session_key[:])
 
@@ -36,12 +36,18 @@ func StartWeb(errch chan error) {
 	r.Handle("/static/{file:.*}", http.StripPrefix("/static/", staticfiles))
 
 	log.Printf("Starting web UI HTTP server on %s", config.WebBindAddr)
+	web_server := &http.Server{
+		Addr:    config.WebBindAddr,
+		Handler: logRequest(r),
+	}
 	go func() {
-		err := http.ListenAndServe(config.WebBindAddr, logRequest(r))
+		err := web_server.ListenAndServe()
 		if err != nil {
 			errch <- err
 		}
 	}()
+
+	return web_server
 }
 
 func logRequest(handler http.Handler) http.Handler {