| Scott Baker | eee8dd8 | 2019-09-24 12:52:34 -0700 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "encoding/binary" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | ) |
| 8 | |
| 9 | type protocolBody interface { |
| 10 | encoder |
| 11 | versionedDecoder |
| 12 | key() int16 |
| 13 | version() int16 |
| 14 | requiredVersion() KafkaVersion |
| 15 | } |
| 16 | |
| 17 | type request struct { |
| 18 | correlationID int32 |
| 19 | clientID string |
| 20 | body protocolBody |
| 21 | } |
| 22 | |
| 23 | func (r *request) encode(pe packetEncoder) (err error) { |
| 24 | pe.push(&lengthField{}) |
| 25 | pe.putInt16(r.body.key()) |
| 26 | pe.putInt16(r.body.version()) |
| 27 | pe.putInt32(r.correlationID) |
| 28 | err = pe.putString(r.clientID) |
| 29 | if err != nil { |
| 30 | return err |
| 31 | } |
| 32 | err = r.body.encode(pe) |
| 33 | if err != nil { |
| 34 | return err |
| 35 | } |
| 36 | return pe.pop() |
| 37 | } |
| 38 | |
| 39 | func (r *request) decode(pd packetDecoder) (err error) { |
| 40 | var key int16 |
| 41 | if key, err = pd.getInt16(); err != nil { |
| 42 | return err |
| 43 | } |
| 44 | var version int16 |
| 45 | if version, err = pd.getInt16(); err != nil { |
| 46 | return err |
| 47 | } |
| 48 | if r.correlationID, err = pd.getInt32(); err != nil { |
| 49 | return err |
| 50 | } |
| 51 | r.clientID, err = pd.getString() |
| 52 | |
| 53 | r.body = allocateBody(key, version) |
| 54 | if r.body == nil { |
| 55 | return PacketDecodingError{fmt.Sprintf("unknown request key (%d)", key)} |
| 56 | } |
| 57 | return r.body.decode(pd, version) |
| 58 | } |
| 59 | |
| 60 | func decodeRequest(r io.Reader) (req *request, bytesRead int, err error) { |
| 61 | lengthBytes := make([]byte, 4) |
| 62 | if _, err := io.ReadFull(r, lengthBytes); err != nil { |
| 63 | return nil, bytesRead, err |
| 64 | } |
| 65 | bytesRead += len(lengthBytes) |
| 66 | |
| 67 | length := int32(binary.BigEndian.Uint32(lengthBytes)) |
| 68 | if length <= 4 || length > MaxRequestSize { |
| 69 | return nil, bytesRead, PacketDecodingError{fmt.Sprintf("message of length %d too large or too small", length)} |
| 70 | } |
| 71 | |
| 72 | encodedReq := make([]byte, length) |
| 73 | if _, err := io.ReadFull(r, encodedReq); err != nil { |
| 74 | return nil, bytesRead, err |
| 75 | } |
| 76 | bytesRead += len(encodedReq) |
| 77 | |
| 78 | req = &request{} |
| 79 | if err := decode(encodedReq, req); err != nil { |
| 80 | return nil, bytesRead, err |
| 81 | } |
| 82 | return req, bytesRead, nil |
| 83 | } |
| 84 | |
| 85 | func allocateBody(key, version int16) protocolBody { |
| 86 | switch key { |
| 87 | case 0: |
| 88 | return &ProduceRequest{} |
| 89 | case 1: |
| 90 | return &FetchRequest{} |
| 91 | case 2: |
| 92 | return &OffsetRequest{Version: version} |
| 93 | case 3: |
| 94 | return &MetadataRequest{} |
| 95 | case 8: |
| 96 | return &OffsetCommitRequest{Version: version} |
| 97 | case 9: |
| 98 | return &OffsetFetchRequest{} |
| 99 | case 10: |
| 100 | return &FindCoordinatorRequest{} |
| 101 | case 11: |
| 102 | return &JoinGroupRequest{} |
| 103 | case 12: |
| 104 | return &HeartbeatRequest{} |
| 105 | case 13: |
| 106 | return &LeaveGroupRequest{} |
| 107 | case 14: |
| 108 | return &SyncGroupRequest{} |
| 109 | case 15: |
| 110 | return &DescribeGroupsRequest{} |
| 111 | case 16: |
| 112 | return &ListGroupsRequest{} |
| 113 | case 17: |
| 114 | return &SaslHandshakeRequest{} |
| 115 | case 18: |
| 116 | return &ApiVersionsRequest{} |
| 117 | case 19: |
| 118 | return &CreateTopicsRequest{} |
| 119 | case 20: |
| 120 | return &DeleteTopicsRequest{} |
| 121 | case 21: |
| 122 | return &DeleteRecordsRequest{} |
| 123 | case 22: |
| 124 | return &InitProducerIDRequest{} |
| 125 | case 24: |
| 126 | return &AddPartitionsToTxnRequest{} |
| 127 | case 25: |
| 128 | return &AddOffsetsToTxnRequest{} |
| 129 | case 26: |
| 130 | return &EndTxnRequest{} |
| 131 | case 28: |
| 132 | return &TxnOffsetCommitRequest{} |
| 133 | case 29: |
| 134 | return &DescribeAclsRequest{} |
| 135 | case 30: |
| 136 | return &CreateAclsRequest{} |
| 137 | case 31: |
| 138 | return &DeleteAclsRequest{} |
| 139 | case 32: |
| 140 | return &DescribeConfigsRequest{} |
| 141 | case 33: |
| 142 | return &AlterConfigsRequest{} |
| 143 | case 36: |
| 144 | return &SaslAuthenticateRequest{} |
| 145 | case 37: |
| 146 | return &CreatePartitionsRequest{} |
| 147 | case 42: |
| 148 | return &DeleteGroupsRequest{} |
| 149 | } |
| 150 | return nil |
| 151 | } |