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65 lines
1.4 KiB
65 lines
1.4 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 Execute struct { |
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Portal string |
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MaxRows uint32 |
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} |
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// Frontend identifies this message as sendable by a PostgreSQL frontend. |
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func (*Execute) Frontend() {} |
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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 *Execute) Decode(src []byte) error { |
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buf := bytes.NewBuffer(src) |
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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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dst.Portal = string(b[:len(b)-1]) |
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if buf.Len() < 4 { |
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return &invalidMessageFormatErr{messageType: "Execute"} |
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} |
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dst.MaxRows = binary.BigEndian.Uint32(buf.Next(4)) |
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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 *Execute) Encode(dst []byte) []byte { |
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dst = append(dst, 'E') |
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sp := len(dst) |
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dst = pgio.AppendInt32(dst, -1) |
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dst = append(dst, src.Portal...) |
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dst = append(dst, 0) |
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dst = pgio.AppendUint32(dst, src.MaxRows) |
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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 Execute) MarshalJSON() ([]byte, error) { |
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return json.Marshal(struct { |
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Type string |
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Portal string |
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MaxRows uint32 |
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}{ |
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Type: "Execute", |
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Portal: src.Portal, |
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MaxRows: src.MaxRows, |
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}) |
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}
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