use the new crypto/tls QUIC Transport (#3860)

internal/qtls/client_session_cache.go

@@ -0,0 +1,61 @@
+//go:build go1.21
+
+package qtls
+
+import (
+	"crypto/tls"
+)
+
+type clientSessionCache struct {
+	getData func() []byte
+	setData func([]byte)
+	wrapped tls.ClientSessionCache
+}
+
+var _ tls.ClientSessionCache = &clientSessionCache{}
+
+func (c clientSessionCache) Put(key string, cs *tls.ClientSessionState) {
+	if cs == nil {
+		c.wrapped.Put(key, nil)
+		return
+	}
+	ticket, state, err := cs.ResumptionState()
+	if err != nil || state == nil {
+		c.wrapped.Put(key, cs)
+		return
+	}
+	state.Extra = append(state.Extra, addExtraPrefix(c.getData()))
+	newCS, err := tls.NewResumptionState(ticket, state)
+	if err != nil {
+		// It's not clear why this would error. Just save the original state.
+		c.wrapped.Put(key, cs)
+		return
+	}
+	c.wrapped.Put(key, newCS)
+}
+
+func (c clientSessionCache) Get(key string) (*tls.ClientSessionState, bool) {
+	cs, ok := c.wrapped.Get(key)
+	if !ok || cs == nil {
+		return cs, ok
+	}
+	ticket, state, err := cs.ResumptionState()
+	if err != nil {
+		// It's not clear why this would error.
+		// Remove the ticket from the session cache, so we don't run into this error over and over again
+		c.wrapped.Put(key, nil)
+		return nil, false
+	}
+	// restore QUIC transport parameters and RTT stored in state.Extra
+	if extra := findExtraData(state.Extra); extra != nil {
+		c.setData(extra)
+	}
+	session, err := tls.NewResumptionState(ticket, state)
+	if err != nil {
+		// It's not clear why this would error.
+		// Remove the ticket from the session cache, so we don't run into this error over and over again
+		c.wrapped.Put(key, nil)
+		return nil, false
+	}
+	return session, true
+}