William Kurkian | ea86948 | 2019-04-09 15:16:11 -0400 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | type MessageBlock struct { |
| 4 | Offset int64 |
| 5 | Msg *Message |
| 6 | } |
| 7 | |
| 8 | // Messages convenience helper which returns either all the |
| 9 | // messages that are wrapped in this block |
| 10 | func (msb *MessageBlock) Messages() []*MessageBlock { |
| 11 | if msb.Msg.Set != nil { |
| 12 | return msb.Msg.Set.Messages |
| 13 | } |
| 14 | return []*MessageBlock{msb} |
| 15 | } |
| 16 | |
| 17 | func (msb *MessageBlock) encode(pe packetEncoder) error { |
| 18 | pe.putInt64(msb.Offset) |
| 19 | pe.push(&lengthField{}) |
| 20 | err := msb.Msg.encode(pe) |
| 21 | if err != nil { |
| 22 | return err |
| 23 | } |
| 24 | return pe.pop() |
| 25 | } |
| 26 | |
| 27 | func (msb *MessageBlock) decode(pd packetDecoder) (err error) { |
| 28 | if msb.Offset, err = pd.getInt64(); err != nil { |
| 29 | return err |
| 30 | } |
| 31 | |
| 32 | if err = pd.push(&lengthField{}); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | |
| 36 | msb.Msg = new(Message) |
| 37 | if err = msb.Msg.decode(pd); err != nil { |
| 38 | return err |
| 39 | } |
| 40 | |
| 41 | if err = pd.pop(); err != nil { |
| 42 | return err |
| 43 | } |
| 44 | |
| 45 | return nil |
| 46 | } |
| 47 | |
| 48 | type MessageSet struct { |
| 49 | PartialTrailingMessage bool // whether the set on the wire contained an incomplete trailing MessageBlock |
| 50 | OverflowMessage bool // whether the set on the wire contained an overflow message |
| 51 | Messages []*MessageBlock |
| 52 | } |
| 53 | |
| 54 | func (ms *MessageSet) encode(pe packetEncoder) error { |
| 55 | for i := range ms.Messages { |
| 56 | err := ms.Messages[i].encode(pe) |
| 57 | if err != nil { |
| 58 | return err |
| 59 | } |
| 60 | } |
| 61 | return nil |
| 62 | } |
| 63 | |
| 64 | func (ms *MessageSet) decode(pd packetDecoder) (err error) { |
| 65 | ms.Messages = nil |
| 66 | |
| 67 | for pd.remaining() > 0 { |
| 68 | magic, err := magicValue(pd) |
| 69 | if err != nil { |
| 70 | if err == ErrInsufficientData { |
| 71 | ms.PartialTrailingMessage = true |
| 72 | return nil |
| 73 | } |
| 74 | return err |
| 75 | } |
| 76 | |
| 77 | if magic > 1 { |
| 78 | return nil |
| 79 | } |
| 80 | |
| 81 | msb := new(MessageBlock) |
| 82 | err = msb.decode(pd) |
| 83 | switch err { |
| 84 | case nil: |
| 85 | ms.Messages = append(ms.Messages, msb) |
| 86 | case ErrInsufficientData: |
| 87 | // As an optimization the server is allowed to return a partial message at the |
| 88 | // end of the message set. Clients should handle this case. So we just ignore such things. |
| 89 | if msb.Offset == -1 { |
| 90 | // This is an overflow message caused by chunked down conversion |
| 91 | ms.OverflowMessage = true |
| 92 | } else { |
| 93 | ms.PartialTrailingMessage = true |
| 94 | } |
| 95 | return nil |
| 96 | default: |
| 97 | return err |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return nil |
| 102 | } |
| 103 | |
| 104 | func (ms *MessageSet) addMessage(msg *Message) { |
| 105 | block := new(MessageBlock) |
| 106 | block.Msg = msg |
| 107 | ms.Messages = append(ms.Messages, block) |
| 108 | } |