add stack utility

.changeset/gold-fishes-smash.md

@@ -0,0 +1,5 @@
+---
+"@livekit/protocol": patch
+---
+
+add stack utility

observability/reporter.go

@@ -1,6 +1,9 @@
 package observability
 
 import (
+	"github.com/go-logr/logr"
+
+	"github.com/livekit/protocol/logger"
 	"github.com/livekit/protocol/observability/agentsobs"
 	"github.com/livekit/protocol/observability/egressobs"
 	"github.com/livekit/protocol/observability/gatewayobs"
@@ -13,7 +16,10 @@ import (
 
 const Project = "livekit"
 
+var discardLogger = logger.LogRLogger(logr.Discard())
+
 type Reporter interface {
+	Logger(projectID string) (logger.Logger, error)
 	Room() roomobs.Reporter
 	Agent() agentsobs.Reporter
 	Gateway() gatewayobs.Reporter
@@ -33,6 +39,10 @@ func NewReporter() Reporter {
 
 type reporter struct{}
 
+func (reporter) Logger(projectID string) (logger.Logger, error) {
+	return discardLogger, nil
+}
+
 func (reporter) Room() roomobs.Reporter {
 	return roomobs.NewNoopReporter()
 }

utils/closers.go

@@ -16,6 +16,7 @@ package utils
 
 import (
 	"io"
+	"slices"
 
 	"go.uber.org/multierr"
 )
@@ -28,7 +29,7 @@ func CombineClosers(cs ...io.Closer) Closers {
 
 func (s *Closers) Close() error {
 	var err error
-	for _, c := range *s {
+	for _, c := range slices.Backward(*s) {
 		if c != nil {
 			err = multierr.Append(err, c.Close())
 		}

utils/stack/stack.go

@@ -0,0 +1,25 @@
+package stack
+
+type Stack[T any] []T
+
+func (s Stack[T]) Empty() bool {
+	return len(s) == 0
+}
+
+func (s *Stack[T]) Reset() {
+	*s = (*s)[:0]
+}
+
+func (s *Stack[T]) Push(v T) {
+	*s = append(*s, v)
+}
+
+func (s *Stack[T]) Pop() T {
+	v := (*s)[len(*s)-1]
+	*s = (*s)[:len(*s)-1]
+	return v
+}
+
+func (s Stack[T]) Peek() T {
+	return s[len(s)-1]
+}