112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
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package sarama
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type MessageBlock struct {
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Offset int64
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Msg *Message
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}
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// Messages convenience helper which returns either all the
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// messages that are wrapped in this block
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func (msb *MessageBlock) Messages() []*MessageBlock {
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if msb.Msg.Set != nil {
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return msb.Msg.Set.Messages
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}
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return []*MessageBlock{msb}
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}
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func (msb *MessageBlock) encode(pe packetEncoder) error {
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pe.putInt64(msb.Offset)
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pe.push(&lengthField{})
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err := msb.Msg.encode(pe)
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if err != nil {
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return err
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}
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return pe.pop()
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}
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func (msb *MessageBlock) decode(pd packetDecoder) (err error) {
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if msb.Offset, err = pd.getInt64(); err != nil {
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return err
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}
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lengthDecoder := acquireLengthField()
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defer releaseLengthField(lengthDecoder)
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if err = pd.push(lengthDecoder); err != nil {
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return err
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}
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msb.Msg = new(Message)
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if err = msb.Msg.decode(pd); err != nil {
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return err
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}
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if err = pd.pop(); err != nil {
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return err
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}
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return nil
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}
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type MessageSet struct {
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PartialTrailingMessage bool // whether the set on the wire contained an incomplete trailing MessageBlock
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OverflowMessage bool // whether the set on the wire contained an overflow message
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Messages []*MessageBlock
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}
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func (ms *MessageSet) encode(pe packetEncoder) error {
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for i := range ms.Messages {
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err := ms.Messages[i].encode(pe)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (ms *MessageSet) decode(pd packetDecoder) (err error) {
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ms.Messages = nil
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for pd.remaining() > 0 {
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magic, err := magicValue(pd)
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if err != nil {
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if err == ErrInsufficientData {
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ms.PartialTrailingMessage = true
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return nil
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}
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return err
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}
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if magic > 1 {
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return nil
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}
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msb := new(MessageBlock)
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err = msb.decode(pd)
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switch err {
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case nil:
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ms.Messages = append(ms.Messages, msb)
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case ErrInsufficientData:
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// As an optimization the server is allowed to return a partial message at the
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// end of the message set. Clients should handle this case. So we just ignore such things.
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if msb.Offset == -1 {
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// This is an overflow message caused by chunked down conversion
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ms.OverflowMessage = true
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} else {
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ms.PartialTrailingMessage = true
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}
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return nil
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default:
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return err
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}
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}
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return nil
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}
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func (ms *MessageSet) addMessage(msg *Message) {
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block := new(MessageBlock)
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block.Msg = msg
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ms.Messages = append(ms.Messages, block)
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}
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