feat: Waku v2 bridge

Issue #12610

vendor/github.com/pion/transport/deadline/deadline.go

@@ -0,0 +1,110 @@
+// Package deadline provides deadline timer used to implement
+// net.Conn compatible connection
+package deadline
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+// Deadline signals updatable deadline timer.
+// Also, it implements context.Context.
+type Deadline struct {
+	exceeded chan struct{}
+	stop     chan struct{}
+	stopped  chan bool
+	deadline time.Time
+	mu       sync.RWMutex
+}
+
+// New creates new deadline timer.
+func New() *Deadline {
+	d := &Deadline{
+		exceeded: make(chan struct{}),
+		stop:     make(chan struct{}),
+		stopped:  make(chan bool, 1),
+	}
+	d.stopped <- true
+	return d
+}
+
+// Set new deadline. Zero value means no deadline.
+func (d *Deadline) Set(t time.Time) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+
+	d.deadline = t
+
+	close(d.stop)
+
+	select {
+	case <-d.exceeded:
+		d.exceeded = make(chan struct{})
+	default:
+		stopped := <-d.stopped
+		if !stopped {
+			d.exceeded = make(chan struct{})
+		}
+	}
+	d.stop = make(chan struct{})
+	d.stopped = make(chan bool, 1)
+
+	if t.IsZero() {
+		d.stopped <- true
+		return
+	}
+
+	if dur := time.Until(t); dur > 0 {
+		exceeded := d.exceeded
+		stopped := d.stopped
+		go func() {
+			select {
+			case <-time.After(dur):
+				close(exceeded)
+				stopped <- false
+			case <-d.stop:
+				stopped <- true
+			}
+		}()
+		return
+	}
+
+	close(d.exceeded)
+	d.stopped <- false
+}
+
+// Done receives deadline signal.
+func (d *Deadline) Done() <-chan struct{} {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	return d.exceeded
+}
+
+// Err returns context.DeadlineExceeded if the deadline is exceeded.
+// Otherwise, it returns nil.
+func (d *Deadline) Err() error {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	select {
+	case <-d.exceeded:
+		return context.DeadlineExceeded
+	default:
+		return nil
+	}
+}
+
+// Deadline returns current deadline.
+func (d *Deadline) Deadline() (time.Time, bool) {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	if d.deadline.IsZero() {
+		return d.deadline, false
+	}
+	return d.deadline, true
+}
+
+// Value returns nil.
+func (d *Deadline) Value(interface{}) interface{} {
+	return nil
+}