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dse_revise_request.go
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dse_revise_request.go
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// Copyright 2020 DataStax
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package message
import (
"fmt"
"io"
"github.com/datastax/go-cassandra-native-protocol/primitive"
)
// Revise was called CANCEL in DSE protocol version 1 and was renamed to REVISE_REQUEST in version 2.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/datastax/go-cassandra-native-protocol/message.Message
type Revise struct {
RevisionType primitive.DseRevisionType
TargetStreamId int32
// The number of pages that the client is ready to receive, or zero to indicate no limit.
// Valid for DSE v2 only when RevisionType is 2 (DseRevisionTypeMoreContinuousPages).
// See ContinuousPagingOptions.
NextPages int32
}
func (m *Revise) IsResponse() bool {
return false
}
func (m *Revise) GetOpCode() primitive.OpCode {
return primitive.OpCodeDseRevise
}
func (m *Revise) String() string {
return fmt.Sprintf("REVISE_REQUEST operation type: %v, stream id: %v", m.RevisionType, m.TargetStreamId)
}
type reviseCodec struct{}
func (c *reviseCodec) Encode(msg Message, dest io.Writer, version primitive.ProtocolVersion) error {
revise, ok := msg.(*Revise)
if !ok {
return fmt.Errorf("expected *message.Revise, got %T", msg)
}
if err := primitive.CheckDseProtocolVersion(version); err != nil {
return err
} else if err := primitive.CheckValidDseRevisionType(revise.RevisionType, version); err != nil {
return err
} else if err := primitive.WriteInt(int32(revise.RevisionType), dest); err != nil {
return fmt.Errorf("cannot write REVISE/CANCEL revision type: %w", err)
}
if err := primitive.WriteInt(revise.TargetStreamId, dest); err != nil {
return fmt.Errorf("cannot write REVISE/CANCEL target stream id: %w", err)
}
switch revise.RevisionType {
case primitive.DseRevisionTypeMoreContinuousPages:
if err := primitive.WriteInt(revise.NextPages, dest); err != nil {
return fmt.Errorf("cannot write REVISE/CANCEL next pages: %w", err)
}
}
return nil
}
func (c *reviseCodec) EncodedLength(msg Message, version primitive.ProtocolVersion) (length int, err error) {
if err := primitive.CheckDseProtocolVersion(version); err != nil {
return -1, err
}
revise, ok := msg.(*Revise)
if !ok {
return -1, fmt.Errorf("expected *message.Revise, got %T", msg)
}
length += primitive.LengthOfInt // revision type
length += primitive.LengthOfInt // stream id
switch revise.RevisionType {
case primitive.DseRevisionTypeMoreContinuousPages:
length += primitive.LengthOfInt // next pages
}
return length, nil
}
func (c *reviseCodec) Decode(source io.Reader, version primitive.ProtocolVersion) (msg Message, err error) {
if err := primitive.CheckDseProtocolVersion(version); err != nil {
return nil, err
}
revise := &Revise{}
var revisionType int32
if revisionType, err = primitive.ReadInt(source); err != nil {
return nil, fmt.Errorf("cannot read REVISE/CANCEL revision type: %w", err)
}
revise.RevisionType = primitive.DseRevisionType(revisionType)
if err := primitive.CheckValidDseRevisionType(revise.RevisionType, version); err != nil {
return nil, err
} else if revise.TargetStreamId, err = primitive.ReadInt(source); err != nil {
return nil, fmt.Errorf("cannot read REVISE/CANCEL target stream id: %w", err)
}
switch revise.RevisionType {
case primitive.DseRevisionTypeMoreContinuousPages:
if revise.NextPages, err = primitive.ReadInt(source); err != nil {
return nil, fmt.Errorf("cannot read REVISE/CANCEL next pages: %w", err)
}
}
return revise, nil
}
func (c *reviseCodec) GetOpCode() primitive.OpCode {
return primitive.OpCodeDseRevise
}