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register.go
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register.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 (
"errors"
"fmt"
"io"
"github.com/datastax/go-cassandra-native-protocol/primitive"
)
// Register is a request to register the client as a listener for the specified event types.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/datastax/go-cassandra-native-protocol/message.Message
type Register struct {
EventTypes []primitive.EventType
}
func (m *Register) IsResponse() bool {
return false
}
func (m *Register) GetOpCode() primitive.OpCode {
return primitive.OpCodeRegister
}
func (m *Register) String() string {
return fmt.Sprint("REGISTER ", m.EventTypes)
}
type registerCodec struct{}
func (c *registerCodec) Encode(msg Message, dest io.Writer, _ primitive.ProtocolVersion) error {
register, ok := msg.(*Register)
if !ok {
return errors.New(fmt.Sprintf("expected *message.Register, got %T", msg))
}
if len(register.EventTypes) == 0 {
return errors.New("REGISTER messages must have at least one event type")
}
for _, eventType := range register.EventTypes {
if err := primitive.CheckValidEventType(eventType); err != nil {
return err
}
}
return primitive.WriteStringList(asStringList(register.EventTypes), dest)
}
func (c *registerCodec) EncodedLength(msg Message, _ primitive.ProtocolVersion) (int, error) {
register, ok := msg.(*Register)
if !ok {
return -1, errors.New(fmt.Sprintf("expected *message.Register, got %T", msg))
}
return primitive.LengthOfStringList(asStringList(register.EventTypes)), nil
}
func (c *registerCodec) Decode(source io.Reader, _ primitive.ProtocolVersion) (Message, error) {
if eventTypes, err := primitive.ReadStringList(source); err != nil {
return nil, err
} else {
for _, eventType := range eventTypes {
if err := primitive.CheckValidEventType(primitive.EventType(eventType)); err != nil {
return nil, err
}
}
return &Register{EventTypes: fromStringList(eventTypes)}, nil
}
}
func (c *registerCodec) GetOpCode() primitive.OpCode {
return primitive.OpCodeRegister
}
func asStringList(eventTypes []primitive.EventType) []string {
strings := make([]string, len(eventTypes))
for i, eventType := range eventTypes {
strings[i] = string(eventType)
}
return strings
}
func fromStringList(strings []string) []primitive.EventType {
eventTypes := make([]primitive.EventType, len(strings))
for i, eventType := range strings {
eventTypes[i] = primitive.EventType(eventType)
}
return eventTypes
}