BUG/MEDIUM: reload: wait until reload is done

to avoid potential issues with reading files on fs,
wait until reload is done

fs/etc/s6-overlay/s6-rc.d/haproxy/run

@@ -23,4 +23,5 @@ fi
 
 echo "Memory limit for HAProxy: ${MEMLIMIT}MiB"
 
+# if master socket is changed, that needs to be aligned in pkg/haproxy/process/interface.go
 exec /usr/local/sbin/haproxy -W -db -m "${MEMLIMIT}" -S /var/run/haproxy-master.sock,level,admin -f /etc/haproxy/haproxy.cfg -f /etc/haproxy/haproxy-aux.cfg

pkg/haproxy/process/interface.go

@@ -13,6 +13,9 @@ import (
 
 var logger = utils.GetLogger()
 
+// MUST be the same as in fs/etc/s6-overlay/s6-rc.d/haproxy/run
+const MASTER_SOCKET_PATH = "/var/run/haproxy-master.sock" //nolint:stylecheck
+
 type Process interface {
 	Service(action string) (err error)
 	UseAuxFile(useAuxFile bool)
@@ -22,16 +25,9 @@ type Process interface {
 func New(env env.Env, osArgs utils.OSArgs, auxCfgFile string, api api.HAProxyClient) (p Process) { //nolint:ireturn
 	switch {
 	case osArgs.UseWiths6Overlay:
-		p = &s6Control{
-			Env:    env,
-			OSArgs: osArgs,
-			API:    api,
-		}
+		p = newS6Control(api, env, osArgs)
 	case osArgs.UseWithPebble:
-		p = &pebbleControl{
-			Env:    env,
-			OSArgs: osArgs,
-		}
+		p = newPebbleControl(env, osArgs)
 	default:
 		p = &directControl{
 			Env:    env,

pkg/haproxy/process/pebble.go

@@ -1,18 +1,42 @@
 package process
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"os/exec"
 
+	"github.com/haproxytech/client-native/v5/runtime"
+	"github.com/haproxytech/client-native/v5/runtime/options"
 	"github.com/haproxytech/kubernetes-ingress/pkg/haproxy/api"
 	"github.com/haproxytech/kubernetes-ingress/pkg/haproxy/env"
 	"github.com/haproxytech/kubernetes-ingress/pkg/utils"
 )
 
 type pebbleControl struct {
-	Env    env.Env
-	OSArgs utils.OSArgs
+	Env               env.Env
+	OSArgs            utils.OSArgs
+	masterSocket      runtime.Runtime
+	masterSocketValid bool
+	logger            utils.Logger
+}
+
+func newPebbleControl(env env.Env, osArgs utils.OSArgs) *pebbleControl {
+	pb := pebbleControl{
+		Env:    env,
+		OSArgs: osArgs,
+		logger: utils.GetLogger(),
+	}
+
+	masterSocket, err := runtime.New(context.Background(), options.MasterSocket(MASTER_SOCKET_PATH, 1))
+	if err != nil {
+		pb.logger.Error(err)
+		return &pb
+	}
+	pb.masterSocketValid = true
+	pb.masterSocket = masterSocket
+
+	return &pb
 }
 
 func (d *pebbleControl) Service(action string) error {
@@ -30,6 +54,15 @@ func (d *pebbleControl) Service(action string) error {
 		// no need to stop it (pebble)
 		return nil
 	case "reload":
+		if d.masterSocketValid {
+			msg, err := d.masterSocket.Reload()
+			if err != nil {
+				d.logger.Error(err)
+			}
+			d.logger.Debug("Reload done")
+			d.logger.Debug(msg)
+			return err
+		}
 		cmd = exec.Command("pebble", "signal", "SIGUSR2", "haproxy")
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr

pkg/haproxy/process/s6-overlay.go

@@ -1,19 +1,44 @@
 package process
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"os/exec"
 
+	"github.com/haproxytech/client-native/v5/runtime"
+	"github.com/haproxytech/client-native/v5/runtime/options"
 	"github.com/haproxytech/kubernetes-ingress/pkg/haproxy/api"
 	"github.com/haproxytech/kubernetes-ingress/pkg/haproxy/env"
 	"github.com/haproxytech/kubernetes-ingress/pkg/utils"
 )
 
 type s6Control struct {
-	API    api.HAProxyClient
-	Env    env.Env
-	OSArgs utils.OSArgs
+	API               api.HAProxyClient
+	Env               env.Env
+	OSArgs            utils.OSArgs
+	masterSocket      runtime.Runtime
+	masterSocketValid bool
+	logger            utils.Logger
+}
+
+func newS6Control(api api.HAProxyClient, env env.Env, osArgs utils.OSArgs) *s6Control {
+	sc := s6Control{
+		API:    api,
+		Env:    env,
+		OSArgs: osArgs,
+		logger: utils.GetLogger(),
+	}
+
+	masterSocket, err := runtime.New(context.Background(), options.MasterSocket(MASTER_SOCKET_PATH, 1))
+	if err != nil {
+		sc.logger.Error(err)
+		return &sc
+	}
+	sc.masterSocketValid = true
+	sc.masterSocket = masterSocket
+
+	return &sc
 }
 
 func (d *s6Control) Service(action string) error {
@@ -31,6 +56,15 @@ func (d *s6Control) Service(action string) error {
 		// no need to stop it (s6)
 		return nil
 	case "reload":
+		if d.masterSocketValid {
+			msg, err := d.masterSocket.Reload()
+			if err != nil {
+				d.logger.Error(err)
+			}
+			d.logger.Debug(msg)
+			return err
+		}
+
 		cmd = exec.Command("s6-svc", "-2", "/run/service/haproxy")
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr