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58 lines
1.3 KiB
58 lines
1.3 KiB
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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