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

     1  package pgproto3
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/json"
     6  )
     7  
     8  type CommandComplete struct {
     9  	CommandTag []byte
    10  }
    11  
    12  // Backend identifies this message as sendable by the PostgreSQL backend.
    13  func (*CommandComplete) Backend() {}
    14  
    15  // Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
    16  // type identifier and 4 byte message length.
    17  func (dst *CommandComplete) Decode(src []byte) error {
    18  	idx := bytes.IndexByte(src, 0)
    19  	if idx == -1 {
    20  		return &invalidMessageFormatErr{messageType: "CommandComplete", details: "unterminated string"}
    21  	}
    22  	if idx != len(src)-1 {
    23  		return &invalidMessageFormatErr{messageType: "CommandComplete", details: "string terminated too early"}
    24  	}
    25  
    26  	dst.CommandTag = src[:idx]
    27  
    28  	return nil
    29  }
    30  
    31  // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
    32  func (src *CommandComplete) Encode(dst []byte) ([]byte, error) {
    33  	dst, sp := beginMessage(dst, 'C')
    34  	dst = append(dst, src.CommandTag...)
    35  	dst = append(dst, 0)
    36  	return finishMessage(dst, sp)
    37  }
    38  
    39  // MarshalJSON implements encoding/json.Marshaler.
    40  func (src CommandComplete) MarshalJSON() ([]byte, error) {
    41  	return json.Marshal(struct {
    42  		Type       string
    43  		CommandTag string
    44  	}{
    45  		Type:       "CommandComplete",
    46  		CommandTag: string(src.CommandTag),
    47  	})
    48  }
    49  
    50  // UnmarshalJSON implements encoding/json.Unmarshaler.
    51  func (dst *CommandComplete) UnmarshalJSON(data []byte) error {
    52  	// Ignore null, like in the main JSON package.
    53  	if string(data) == "null" {
    54  		return nil
    55  	}
    56  
    57  	var msg struct {
    58  		CommandTag string
    59  	}
    60  	if err := json.Unmarshal(data, &msg); err != nil {
    61  		return err
    62  	}
    63  
    64  	dst.CommandTag = []byte(msg.CommandTag)
    65  	return nil
    66  }