59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
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package pgproto3
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import (
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"encoding/binary"
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"encoding/json"
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"errors"
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"github.com/jackc/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 uint32
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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("bad cancel request size")
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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 = binary.BigEndian.Uint32(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 {
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dst = pgio.AppendInt32(dst, 16)
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dst = pgio.AppendInt32(dst, cancelRequestCode)
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dst = pgio.AppendUint32(dst, src.ProcessID)
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dst = pgio.AppendUint32(dst, src.SecretKey)
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return dst
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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 uint32
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}{
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Type: "CancelRequest",
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ProcessID: src.ProcessID,
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SecretKey: src.SecretKey,
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})
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}
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