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106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
package protocol
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import (
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"bufio"
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"encoding/binary"
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"errors"
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"io"
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"strings"
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)
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// 支持的 gateway wire format 名称。
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const (
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WireFormatPacket = "packet"
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WireFormatFrameV1 = "frame_v1"
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)
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// ErrInvalidWireFormat 表示 envelope 使用了不支持的线协议格式。
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var ErrInvalidWireFormat = errors.New("protocol wire format is invalid")
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// Envelope 是 packet 与 frame_v1 的统一传输容器。
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type Envelope struct {
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Format string
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Packet Packet
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Frame Frame
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}
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// ReadEnvelope 自动探测并读取 packet 或 frame_v1。
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func ReadEnvelope(r *bufio.Reader, maxBodySize uint32) (Envelope, error) {
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if r == nil {
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return Envelope{}, io.ErrUnexpectedEOF
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}
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peek, err := r.Peek(4)
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if err != nil {
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return Envelope{}, err
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}
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// 读侧兼容两种线协议:先探测 frame_v1 magic,未命中则退回旧 packet 格式,方便客户端灰度升级。
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if binary.LittleEndian.Uint16(peek[0:2]) == FrameMagic &&
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peek[2] == FrameVersion1 &&
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int(peek[3]) >= FrameHeaderSizeV1 {
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frame, err := ReadFrame(r, maxBodySize)
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if err != nil {
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return Envelope{}, err
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}
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return Envelope{
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Format: WireFormatFrameV1,
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Packet: packetFromFrame(frame),
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Frame: frame,
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}, nil
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}
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packet, err := ReadPacket(r, maxBodySize)
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if err != nil {
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return Envelope{}, err
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}
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return Envelope{
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Format: WireFormatPacket,
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Packet: packet,
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}, nil
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}
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// WriteEnvelope 按指定 wire format 写出 envelope。
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func WriteEnvelope(w io.Writer, envelope Envelope) error {
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format := strings.TrimSpace(envelope.Format)
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if format == "" {
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format = WireFormatPacket
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} else {
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format = NormalizeWireFormat(format)
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}
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switch format {
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case WireFormatPacket:
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return WritePacket(w, envelope.Packet)
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case WireFormatFrameV1:
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// frame_v1 的压缩标记以 Packet.Compressed 为准,避免调用方同时维护 Packet 和 Frame 两份状态时产生漂移。
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flags := envelope.Frame.Flags &^ FrameFlagCompressed
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if envelope.Packet.Compressed {
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flags |= FrameFlagCompressed
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}
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frame := Frame{
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Version: envelope.Frame.Version,
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Flags: flags,
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Codec: envelope.Frame.Codec,
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PacketID: envelope.Packet.PacketID,
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MsgID: envelope.Packet.MsgID,
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Sequence: envelope.Frame.Sequence,
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Body: envelope.Packet.Body,
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Metadata: CloneFrameMetadata(envelope.Frame.Metadata),
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}
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return WriteFrame(w, frame)
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default:
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return ErrInvalidWireFormat
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}
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}
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// NormalizeWireFormat 归一化 wire format 文本。
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func NormalizeWireFormat(format string) string {
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switch strings.ToLower(strings.TrimSpace(format)) {
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case "":
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return WireFormatPacket
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case WireFormatPacket:
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return WireFormatPacket
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case WireFormatFrameV1:
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return WireFormatFrameV1
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default:
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return ""
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}
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}
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