120 lines
2.5 KiB
Go
120 lines
2.5 KiB
Go
package sarama
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import (
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"encoding/binary"
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"fmt"
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"io"
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)
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type protocolBody interface {
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encoder
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versionedDecoder
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key() int16
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version() int16
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requiredVersion() KafkaVersion
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}
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type request struct {
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correlationID int32
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clientID string
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body protocolBody
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}
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func (r *request) encode(pe packetEncoder) (err error) {
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pe.push(&lengthField{})
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pe.putInt16(r.body.key())
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pe.putInt16(r.body.version())
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pe.putInt32(r.correlationID)
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err = pe.putString(r.clientID)
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if err != nil {
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return err
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}
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err = r.body.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 (r *request) decode(pd packetDecoder) (err error) {
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var key int16
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if key, err = pd.getInt16(); err != nil {
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return err
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}
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var version int16
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if version, err = pd.getInt16(); err != nil {
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return err
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}
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if r.correlationID, err = pd.getInt32(); err != nil {
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return err
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}
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r.clientID, err = pd.getString()
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r.body = allocateBody(key, version)
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if r.body == nil {
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return PacketDecodingError{fmt.Sprintf("unknown request key (%d)", key)}
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}
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return r.body.decode(pd, version)
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}
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func decodeRequest(r io.Reader) (req *request, bytesRead int, err error) {
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lengthBytes := make([]byte, 4)
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if _, err := io.ReadFull(r, lengthBytes); err != nil {
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return nil, bytesRead, err
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}
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bytesRead += len(lengthBytes)
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length := int32(binary.BigEndian.Uint32(lengthBytes))
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if length <= 4 || length > MaxRequestSize {
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return nil, bytesRead, PacketDecodingError{fmt.Sprintf("message of length %d too large or too small", length)}
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}
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encodedReq := make([]byte, length)
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if _, err := io.ReadFull(r, encodedReq); err != nil {
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return nil, bytesRead, err
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}
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bytesRead += len(encodedReq)
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req = &request{}
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if err := decode(encodedReq, req); err != nil {
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return nil, bytesRead, err
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}
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return req, bytesRead, nil
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}
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func allocateBody(key, version int16) protocolBody {
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switch key {
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case 0:
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return &ProduceRequest{}
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case 1:
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return &FetchRequest{}
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case 2:
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return &OffsetRequest{Version: version}
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case 3:
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return &MetadataRequest{}
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case 8:
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return &OffsetCommitRequest{Version: version}
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case 9:
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return &OffsetFetchRequest{}
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case 10:
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return &ConsumerMetadataRequest{}
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case 11:
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return &JoinGroupRequest{}
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case 12:
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return &HeartbeatRequest{}
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case 13:
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return &LeaveGroupRequest{}
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case 14:
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return &SyncGroupRequest{}
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case 15:
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return &DescribeGroupsRequest{}
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case 16:
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return &ListGroupsRequest{}
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case 17:
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return &SaslHandshakeRequest{}
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case 18:
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return &ApiVersionsRequest{}
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}
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return nil
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}
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