Initial checkin of gRPC to third_party/

third_party/grpc/tools/http2_interop/s6.5.go

Index: third_party/grpc/tools/http2_interop/s6.5.go
diff --git a/third_party/grpc/tools/http2_interop/s6.5.go b/third_party/grpc/tools/http2_interop/s6.5.go
new file mode 100644
index 0000000000000000000000000000000000000000..4295c46f73aab6ca28459a37d02104189d90e08b
--- /dev/null
+++ b/third_party/grpc/tools/http2_interop/s6.5.go
@@ -0,0 +1,90 @@
+package http2interop
+
+import (
+	"fmt"
+	"time"
+)
+
+// Section 6.5 says the minimum SETTINGS_MAX_FRAME_SIZE is 16,384
+func testSmallMaxFrameSize(ctx *HTTP2InteropCtx) error {
+	conn, err := connect(ctx)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	conn.SetDeadline(time.Now().Add(defaultTimeout))
+
+	sf := &SettingsFrame{
+		Params: []SettingsParameter{{
+			Identifier: SettingsMaxFrameSize,
+			Value:      1<<14 - 1, // 1 less than the smallest maximum
+		}},
+	}
+
+	if err := http2Connect(conn, sf); err != nil {
+		return err
+	}
+
+	if _, err := expectGoAwaySoon(conn); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Section 6.5.3 says all settings frames must be acked.
+func testAllSettingsFramesAcked(ctx *HTTP2InteropCtx) error {
+	conn, err := connect(ctx)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	conn.SetDeadline(time.Now().Add(defaultTimeout))
+
+	sf := &SettingsFrame{}
+	if err := http2Connect(conn, sf); err != nil {
+		return err
+	}
+
+	// The spec says "The values in the SETTINGS frame MUST be processed in the order they
+	// appear. [...] Once all values have been processed, the recipient MUST immediately
+	// emit a SETTINGS frame with the ACK flag set."  From my understanding, processing all
+	// of no values warrants an ack per frame.
+	for i := 0; i < 10; i++ {
+		if err := streamFrame(conn, sf); err != nil {
+			return err
+		}
+	}
+
+	var settingsFramesReceived = 0
+	// The server by default sends a settings frame as part of the handshake, and another
+	// after the receipt of the initial settings frame as part of our conneection preface.
+	// This means we expected 1 + 1 + 10 = 12 settings frames in return, with all but the
+	// first having the ack bit.
+	for settingsFramesReceived < 12 {
+		f, err := parseFrame(conn)
+		if err != nil {
+			return err
+		}
+
+		// Other frames come down the wire too, including window update.  Just ignore those.
+		if f, ok := f.(*SettingsFrame); ok {
+			settingsFramesReceived += 1
+			if settingsFramesReceived == 1 {
+				if f.Header.Flags&SETTINGS_FLAG_ACK > 0 {
+					return fmt.Errorf("settings frame should not have used ack: %v")
+				}
+				continue
+			}
+
+			if f.Header.Flags&SETTINGS_FLAG_ACK == 0 {
+				return fmt.Errorf("settings frame should have used ack: %v", f)
+			}
+			if len(f.Params) != 0 {
+				return fmt.Errorf("settings ack cannot have params: %v", f)
+			}
+		}
+	}
+
+	return nil
+}