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73 lines
1.6 KiB
73 lines
1.6 KiB
package pgproto3 |
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import ( |
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"bytes" |
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"encoding/binary" |
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"encoding/json" |
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"github.com/jackc/pgio" |
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) |
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type NotificationResponse struct { |
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PID uint32 |
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Channel string |
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Payload string |
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} |
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// Backend identifies this message as sendable by the PostgreSQL backend. |
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func (*NotificationResponse) Backend() {} |
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// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message |
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// type identifier and 4 byte message length. |
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func (dst *NotificationResponse) Decode(src []byte) error { |
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buf := bytes.NewBuffer(src) |
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pid := binary.BigEndian.Uint32(buf.Next(4)) |
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b, err := buf.ReadBytes(0) |
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if err != nil { |
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return err |
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} |
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channel := string(b[:len(b)-1]) |
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b, err = buf.ReadBytes(0) |
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if err != nil { |
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return err |
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} |
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payload := string(b[:len(b)-1]) |
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*dst = NotificationResponse{PID: pid, Channel: channel, Payload: payload} |
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return nil |
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} |
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// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length. |
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func (src *NotificationResponse) Encode(dst []byte) []byte { |
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dst = append(dst, 'A') |
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sp := len(dst) |
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dst = pgio.AppendInt32(dst, -1) |
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dst = pgio.AppendUint32(dst, src.PID) |
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dst = append(dst, src.Channel...) |
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dst = append(dst, 0) |
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dst = append(dst, src.Payload...) |
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dst = append(dst, 0) |
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pgio.SetInt32(dst[sp:], int32(len(dst[sp:]))) |
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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 NotificationResponse) MarshalJSON() ([]byte, error) { |
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return json.Marshal(struct { |
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Type string |
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PID uint32 |
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Channel string |
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Payload string |
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}{ |
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Type: "NotificationResponse", |
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PID: src.PID, |
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Channel: src.Channel, |
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Payload: src.Payload, |
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}) |
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}
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