github.com/datastax/go-cassandra-native-protocol@v0.0.0-20220706104457-5e8aad05cf90/primitive/inet.go (about)

     1  // Copyright 2020 DataStax
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package primitive
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"io"
    21  	"net"
    22  )
    23  
    24  // [inet] (net.IP + port)
    25  
    26  // Inet is the [inet] protocol type. It is the combination of a net.IP + port number.
    27  // +k8s:deepcopy-gen=true
    28  type Inet struct {
    29  	Addr net.IP
    30  	Port int32
    31  }
    32  
    33  func (i Inet) String() string {
    34  	return fmt.Sprintf("%v:%v", i.Addr, i.Port)
    35  }
    36  
    37  func ReadInet(source io.Reader) (*Inet, error) {
    38  	if addr, err := ReadInetAddr(source); err != nil {
    39  		return nil, fmt.Errorf("cannot read [inet] address: %w", err)
    40  	} else if port, err := ReadInt(source); err != nil {
    41  		return nil, fmt.Errorf("cannot read [inet] port number: %w", err)
    42  	} else {
    43  		return &Inet{Addr: addr, Port: port}, nil
    44  	}
    45  }
    46  
    47  func WriteInet(inet *Inet, dest io.Writer) error {
    48  	if inet == nil {
    49  		return errors.New("cannot write nil [inet]")
    50  	}
    51  	if err := WriteInetAddr(inet.Addr, dest); err != nil {
    52  		return fmt.Errorf("cannot write [inet] address: %w", err)
    53  	} else if err := WriteInt(inet.Port, dest); err != nil {
    54  		return fmt.Errorf("cannot write [inet] port number: %w", err)
    55  	}
    56  	return nil
    57  }
    58  
    59  func LengthOfInet(inet *Inet) (length int, err error) {
    60  	if inet == nil {
    61  		return -1, errors.New("cannot compute nil [inet] length")
    62  	}
    63  	length, err = LengthOfInetAddr(inet.Addr)
    64  	if err != nil {
    65  		return -1, err
    66  	}
    67  	return length + LengthOfInt, nil
    68  }