github.com/jackc/pgx/v5@v5.5.5/pgproto3/parameter_status.go (about)

     1  package pgproto3
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/json"
     6  )
     7  
     8  type ParameterStatus struct {
     9  	Name  string
    10  	Value string
    11  }
    12  
    13  // Backend identifies this message as sendable by the PostgreSQL backend.
    14  func (*ParameterStatus) Backend() {}
    15  
    16  // Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
    17  // type identifier and 4 byte message length.
    18  func (dst *ParameterStatus) Decode(src []byte) error {
    19  	buf := bytes.NewBuffer(src)
    20  
    21  	b, err := buf.ReadBytes(0)
    22  	if err != nil {
    23  		return err
    24  	}
    25  	name := string(b[:len(b)-1])
    26  
    27  	b, err = buf.ReadBytes(0)
    28  	if err != nil {
    29  		return err
    30  	}
    31  	value := string(b[:len(b)-1])
    32  
    33  	*dst = ParameterStatus{Name: name, Value: value}
    34  	return nil
    35  }
    36  
    37  // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
    38  func (src *ParameterStatus) Encode(dst []byte) ([]byte, error) {
    39  	dst, sp := beginMessage(dst, 'S')
    40  	dst = append(dst, src.Name...)
    41  	dst = append(dst, 0)
    42  	dst = append(dst, src.Value...)
    43  	dst = append(dst, 0)
    44  	return finishMessage(dst, sp)
    45  }
    46  
    47  // MarshalJSON implements encoding/json.Marshaler.
    48  func (ps ParameterStatus) MarshalJSON() ([]byte, error) {
    49  	return json.Marshal(struct {
    50  		Type  string
    51  		Name  string
    52  		Value string
    53  	}{
    54  		Type:  "ParameterStatus",
    55  		Name:  ps.Name,
    56  		Value: ps.Value,
    57  	})
    58  }