95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
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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"errors"
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"fmt"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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const ProtocolVersionNumber = 196608 // 3.0
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type StartupMessage struct {
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ProtocolVersion uint32
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Parameters map[string]string
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}
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// Frontend identifies this message as sendable by a PostgreSQL frontend.
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func (*StartupMessage) 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 *StartupMessage) Decode(src []byte) error {
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if len(src) < 4 {
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return errors.New("startup message too short")
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}
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dst.ProtocolVersion = binary.BigEndian.Uint32(src)
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rp := 4
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if dst.ProtocolVersion != ProtocolVersionNumber {
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return fmt.Errorf("Bad startup message version number. Expected %d, got %d", ProtocolVersionNumber, dst.ProtocolVersion)
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}
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dst.Parameters = make(map[string]string)
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for {
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idx := bytes.IndexByte(src[rp:], 0)
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if idx < 0 {
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return &invalidMessageFormatErr{messageType: "StartupMessage"}
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}
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key := string(src[rp : rp+idx])
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rp += idx + 1
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idx = bytes.IndexByte(src[rp:], 0)
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if idx < 0 {
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return &invalidMessageFormatErr{messageType: "StartupMessage"}
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}
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value := string(src[rp : rp+idx])
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rp += idx + 1
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dst.Parameters[key] = value
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if len(src[rp:]) == 1 {
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if src[rp] != 0 {
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return fmt.Errorf("Bad startup message last byte. Expected 0, got %d", src[rp])
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}
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break
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}
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}
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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 *StartupMessage) Encode(dst []byte) ([]byte, error) {
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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.ProtocolVersion)
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for k, v := range src.Parameters {
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dst = append(dst, k...)
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dst = append(dst, 0)
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dst = append(dst, v...)
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dst = append(dst, 0)
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}
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dst = append(dst, 0)
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return finishMessage(dst, sp)
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src StartupMessage) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ProtocolVersion uint32
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Parameters map[string]string
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}{
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Type: "StartupMessage",
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ProtocolVersion: src.ProtocolVersion,
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Parameters: src.Parameters,
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})
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}
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