khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "encoding/binary" |
| 5 | "time" |
| 6 | ) |
| 7 | |
| 8 | const ( |
| 9 | controlMask = 0x20 |
| 10 | maximumRecordOverhead = 5*binary.MaxVarintLen32 + binary.MaxVarintLen64 + 1 |
| 11 | ) |
| 12 | |
| 13 | type RecordHeader struct { |
| 14 | Key []byte |
| 15 | Value []byte |
| 16 | } |
| 17 | |
| 18 | func (h *RecordHeader) encode(pe packetEncoder) error { |
| 19 | if err := pe.putVarintBytes(h.Key); err != nil { |
| 20 | return err |
| 21 | } |
| 22 | return pe.putVarintBytes(h.Value) |
| 23 | } |
| 24 | |
| 25 | func (h *RecordHeader) decode(pd packetDecoder) (err error) { |
| 26 | if h.Key, err = pd.getVarintBytes(); err != nil { |
| 27 | return err |
| 28 | } |
| 29 | |
| 30 | if h.Value, err = pd.getVarintBytes(); err != nil { |
| 31 | return err |
| 32 | } |
| 33 | return nil |
| 34 | } |
| 35 | |
| 36 | type Record struct { |
| 37 | Attributes int8 |
| 38 | TimestampDelta time.Duration |
| 39 | OffsetDelta int64 |
| 40 | Key []byte |
| 41 | Value []byte |
| 42 | Headers []*RecordHeader |
| 43 | |
| 44 | length varintLengthField |
| 45 | } |
| 46 | |
| 47 | func (r *Record) encode(pe packetEncoder) error { |
| 48 | pe.push(&r.length) |
| 49 | pe.putInt8(r.Attributes) |
| 50 | pe.putVarint(int64(r.TimestampDelta / time.Millisecond)) |
| 51 | pe.putVarint(r.OffsetDelta) |
| 52 | if err := pe.putVarintBytes(r.Key); err != nil { |
| 53 | return err |
| 54 | } |
| 55 | if err := pe.putVarintBytes(r.Value); err != nil { |
| 56 | return err |
| 57 | } |
| 58 | pe.putVarint(int64(len(r.Headers))) |
| 59 | |
| 60 | for _, h := range r.Headers { |
| 61 | if err := h.encode(pe); err != nil { |
| 62 | return err |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | return pe.pop() |
| 67 | } |
| 68 | |
| 69 | func (r *Record) decode(pd packetDecoder) (err error) { |
| 70 | if err = pd.push(&r.length); err != nil { |
| 71 | return err |
| 72 | } |
| 73 | |
| 74 | if r.Attributes, err = pd.getInt8(); err != nil { |
| 75 | return err |
| 76 | } |
| 77 | |
| 78 | timestamp, err := pd.getVarint() |
| 79 | if err != nil { |
| 80 | return err |
| 81 | } |
| 82 | r.TimestampDelta = time.Duration(timestamp) * time.Millisecond |
| 83 | |
| 84 | if r.OffsetDelta, err = pd.getVarint(); err != nil { |
| 85 | return err |
| 86 | } |
| 87 | |
| 88 | if r.Key, err = pd.getVarintBytes(); err != nil { |
| 89 | return err |
| 90 | } |
| 91 | |
| 92 | if r.Value, err = pd.getVarintBytes(); err != nil { |
| 93 | return err |
| 94 | } |
| 95 | |
| 96 | numHeaders, err := pd.getVarint() |
| 97 | if err != nil { |
| 98 | return err |
| 99 | } |
| 100 | |
| 101 | if numHeaders >= 0 { |
| 102 | r.Headers = make([]*RecordHeader, numHeaders) |
| 103 | } |
| 104 | for i := int64(0); i < numHeaders; i++ { |
| 105 | hdr := new(RecordHeader) |
| 106 | if err := hdr.decode(pd); err != nil { |
| 107 | return err |
| 108 | } |
| 109 | r.Headers[i] = hdr |
| 110 | } |
| 111 | |
| 112 | return pd.pop() |
| 113 | } |