85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package pgproto3
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import (
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"errors"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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const cancelRequestCode = 80877102
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type CancelRequest struct {
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ProcessID uint32
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SecretKey []byte
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}
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// Frontend identifies this message as sendable by a PostgreSQL frontend.
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func (*CancelRequest) Frontend() {}
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func (dst *CancelRequest) Decode(src []byte) error {
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if len(src) < 12 {
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return errors.New("cancel request too short")
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}
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if len(src) > 264 {
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return errors.New("cancel request too long")
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}
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requestCode := binary.BigEndian.Uint32(src)
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if requestCode != cancelRequestCode {
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return errors.New("bad cancel request code")
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}
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dst.ProcessID = binary.BigEndian.Uint32(src[4:])
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dst.SecretKey = make([]byte, len(src)-8)
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copy(dst.SecretKey, src[8:])
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return nil
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}
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// Encode encodes src into dst. dst will include the 4 byte message length.
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func (src *CancelRequest) Encode(dst []byte) ([]byte, error) {
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if len(src.SecretKey) > 256 {
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return nil, errors.New("secret key too long")
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}
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msgLen := int32(12 + len(src.SecretKey))
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dst = pgio.AppendInt32(dst, msgLen)
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dst = pgio.AppendInt32(dst, cancelRequestCode)
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dst = pgio.AppendUint32(dst, src.ProcessID)
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dst = append(dst, src.SecretKey...)
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return dst, nil
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src CancelRequest) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ProcessID uint32
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SecretKey string
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}{
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Type: "CancelRequest",
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ProcessID: src.ProcessID,
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SecretKey: hex.EncodeToString(src.SecretKey),
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})
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}
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// UnmarshalJSON implements encoding/json.Unmarshaler.
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func (dst *CancelRequest) UnmarshalJSON(data []byte) error {
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var msg struct {
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ProcessID uint32
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SecretKey string
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}
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if err := json.Unmarshal(data, &msg); err != nil {
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return err
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}
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dst.ProcessID = msg.ProcessID
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secretKey, err := hex.DecodeString(msg.SecretKey)
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if err != nil {
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return err
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}
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dst.SecretKey = secretKey
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return nil
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}
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