Pragya Arya | 324337e | 2020-02-20 14:35:08 +0530 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "encoding/binary" |
| 5 | "fmt" |
| 6 | "math" |
| 7 | |
| 8 | "github.com/rcrowley/go-metrics" |
| 9 | ) |
| 10 | |
| 11 | type prepEncoder struct { |
| 12 | stack []pushEncoder |
| 13 | length int |
| 14 | } |
| 15 | |
| 16 | // primitives |
| 17 | |
| 18 | func (pe *prepEncoder) putInt8(in int8) { |
| 19 | pe.length++ |
| 20 | } |
| 21 | |
| 22 | func (pe *prepEncoder) putInt16(in int16) { |
| 23 | pe.length += 2 |
| 24 | } |
| 25 | |
| 26 | func (pe *prepEncoder) putInt32(in int32) { |
| 27 | pe.length += 4 |
| 28 | } |
| 29 | |
| 30 | func (pe *prepEncoder) putInt64(in int64) { |
| 31 | pe.length += 8 |
| 32 | } |
| 33 | |
| 34 | func (pe *prepEncoder) putVarint(in int64) { |
| 35 | var buf [binary.MaxVarintLen64]byte |
| 36 | pe.length += binary.PutVarint(buf[:], in) |
| 37 | } |
| 38 | |
| 39 | func (pe *prepEncoder) putArrayLength(in int) error { |
| 40 | if in > math.MaxInt32 { |
| 41 | return PacketEncodingError{fmt.Sprintf("array too long (%d)", in)} |
| 42 | } |
| 43 | pe.length += 4 |
| 44 | return nil |
| 45 | } |
| 46 | |
| 47 | func (pe *prepEncoder) putBool(in bool) { |
| 48 | pe.length++ |
| 49 | } |
| 50 | |
| 51 | // arrays |
| 52 | |
| 53 | func (pe *prepEncoder) putBytes(in []byte) error { |
| 54 | pe.length += 4 |
| 55 | if in == nil { |
| 56 | return nil |
| 57 | } |
| 58 | return pe.putRawBytes(in) |
| 59 | } |
| 60 | |
| 61 | func (pe *prepEncoder) putVarintBytes(in []byte) error { |
| 62 | if in == nil { |
| 63 | pe.putVarint(-1) |
| 64 | return nil |
| 65 | } |
| 66 | pe.putVarint(int64(len(in))) |
| 67 | return pe.putRawBytes(in) |
| 68 | } |
| 69 | |
| 70 | func (pe *prepEncoder) putRawBytes(in []byte) error { |
| 71 | if len(in) > math.MaxInt32 { |
| 72 | return PacketEncodingError{fmt.Sprintf("byteslice too long (%d)", len(in))} |
| 73 | } |
| 74 | pe.length += len(in) |
| 75 | return nil |
| 76 | } |
| 77 | |
| 78 | func (pe *prepEncoder) putNullableString(in *string) error { |
| 79 | if in == nil { |
| 80 | pe.length += 2 |
| 81 | return nil |
| 82 | } |
| 83 | return pe.putString(*in) |
| 84 | } |
| 85 | |
| 86 | func (pe *prepEncoder) putString(in string) error { |
| 87 | pe.length += 2 |
| 88 | if len(in) > math.MaxInt16 { |
| 89 | return PacketEncodingError{fmt.Sprintf("string too long (%d)", len(in))} |
| 90 | } |
| 91 | pe.length += len(in) |
| 92 | return nil |
| 93 | } |
| 94 | |
| 95 | func (pe *prepEncoder) putStringArray(in []string) error { |
| 96 | err := pe.putArrayLength(len(in)) |
| 97 | if err != nil { |
| 98 | return err |
| 99 | } |
| 100 | |
| 101 | for _, str := range in { |
| 102 | if err := pe.putString(str); err != nil { |
| 103 | return err |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | return nil |
| 108 | } |
| 109 | |
| 110 | func (pe *prepEncoder) putInt32Array(in []int32) error { |
| 111 | err := pe.putArrayLength(len(in)) |
| 112 | if err != nil { |
| 113 | return err |
| 114 | } |
| 115 | pe.length += 4 * len(in) |
| 116 | return nil |
| 117 | } |
| 118 | |
| 119 | func (pe *prepEncoder) putInt64Array(in []int64) error { |
| 120 | err := pe.putArrayLength(len(in)) |
| 121 | if err != nil { |
| 122 | return err |
| 123 | } |
| 124 | pe.length += 8 * len(in) |
| 125 | return nil |
| 126 | } |
| 127 | |
| 128 | func (pe *prepEncoder) offset() int { |
| 129 | return pe.length |
| 130 | } |
| 131 | |
| 132 | // stackable |
| 133 | |
| 134 | func (pe *prepEncoder) push(in pushEncoder) { |
| 135 | in.saveOffset(pe.length) |
| 136 | pe.length += in.reserveLength() |
| 137 | pe.stack = append(pe.stack, in) |
| 138 | } |
| 139 | |
| 140 | func (pe *prepEncoder) pop() error { |
| 141 | in := pe.stack[len(pe.stack)-1] |
| 142 | pe.stack = pe.stack[:len(pe.stack)-1] |
| 143 | if dpe, ok := in.(dynamicPushEncoder); ok { |
| 144 | pe.length += dpe.adjustLength(pe.length) |
| 145 | } |
| 146 | |
| 147 | return nil |
| 148 | } |
| 149 | |
| 150 | // we do not record metrics during the prep encoder pass |
| 151 | func (pe *prepEncoder) metricRegistry() metrics.Registry { |
| 152 | return nil |
| 153 | } |