implement and use the MAX_STREAMS frame

internal/wire/max_streams_frame_test.go

@@ -0,0 +1,78 @@
+package wire
+
+import (
+	"bytes"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/utils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("MAX_STREAMS frame", func() {
+	Context("parsing", func() {
+		It("accepts a frame for a bidirectional stream", func() {
+			data := []byte{0x1c}
+			data = append(data, encodeVarInt(0xdecaf)...)
+			b := bytes.NewReader(data)
+			f, err := parseMaxStreamsFrame(b, protocol.VersionWhatever)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(f.Type).To(Equal(protocol.StreamTypeBidi))
+			Expect(f.MaxStreams).To(BeEquivalentTo(0xdecaf))
+			Expect(b.Len()).To(BeZero())
+		})
+
+		It("accepts a frame for a bidirectional stream", func() {
+			data := []byte{0x1d}
+			data = append(data, encodeVarInt(0xdecaf)...)
+			b := bytes.NewReader(data)
+			f, err := parseMaxStreamsFrame(b, protocol.VersionWhatever)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(f.Type).To(Equal(protocol.StreamTypeUni))
+			Expect(f.MaxStreams).To(BeEquivalentTo(0xdecaf))
+			Expect(b.Len()).To(BeZero())
+		})
+
+		It("errors on EOFs", func() {
+			data := []byte{0x1d}
+			data = append(data, encodeVarInt(0xdeadbeefcafe13)...)
+			_, err := parseMaxStreamsFrame(bytes.NewReader(data), protocol.VersionWhatever)
+			Expect(err).NotTo(HaveOccurred())
+			for i := range data {
+				_, err := parseMaxStreamsFrame(bytes.NewReader(data[0:i]), protocol.VersionWhatever)
+				Expect(err).To(HaveOccurred())
+			}
+		})
+	})
+
+	Context("writing", func() {
+		It("for a bidirectional stream", func() {
+			f := &MaxStreamsFrame{
+				Type:       protocol.StreamTypeBidi,
+				MaxStreams: 0xdeadbeef,
+			}
+			b := &bytes.Buffer{}
+			Expect(f.Write(b, protocol.VersionWhatever)).To(Succeed())
+			expected := []byte{0x1c}
+			expected = append(expected, encodeVarInt(0xdeadbeef)...)
+			Expect(b.Bytes()).To(Equal(expected))
+		})
+
+		It("for a unidirectional stream", func() {
+			f := &MaxStreamsFrame{
+				Type:       protocol.StreamTypeUni,
+				MaxStreams: 0xdecafbad,
+			}
+			b := &bytes.Buffer{}
+			Expect(f.Write(b, protocol.VersionWhatever)).To(Succeed())
+			expected := []byte{0x1d}
+			expected = append(expected, encodeVarInt(0xdecafbad)...)
+			Expect(b.Bytes()).To(Equal(expected))
+		})
+
+		It("has the correct min length", func() {
+			frame := MaxStreamsFrame{MaxStreams: 0x1337}
+			Expect(frame.Length(protocol.VersionWhatever)).To(Equal(1 + utils.VarIntLen(0x1337)))
+		})
+	})
+})