func (c *FrontendConnection) readDescribeMessage(msg *fbcore.Message) (byte, error) {
typ, err := fbbuf.ReadByte(msg.Payload())
if err != nil {
return 0, err
}
if typ != 'S' && typ != 'P' {
return 0, fmt.Errorf("invalid type %q", typ)
}
statementName, err := fbbuf.ReadCString(msg.Payload())
if err != nil {
return 0, err
}
if statementName != "" {
return 0, fmt.Errorf("tried to use statement/portal name %q; only unnamed statements and portals are supported")
}
// TODO: ensure we're at the end of the packet
return typ, nil
}
func parseLogRecord(
dst *logRecord, data []byte, exit exitFn) {
b := bytes.NewBuffer(data)
// Read the next nullable string from b, returning a 'nil'
// *string should it be null.
nextNullableString := func() *string {
np, err := buf.ReadByte(b)
if err != nil {
exit(err)
}
switch np {
case 'P':
s, err := buf.ReadCString(b)
if err != nil {
exit(err)
}
return &s
case 'N':
// 'N' is still followed by a NUL byte that
// must be consumed.
_, err := buf.ReadCString(b)
if err != nil {
exit(err)
}
return nil
default:
exit("Expected nullable string "+
"control character, got %c", np)
}
exit("Prior switch should always return")
panic("exit should panic/return, " +
"but the compiler doesn't know that")
}
// Read a non-nullable string from b
nextString := func() string {
s, err := buf.ReadCString(b)
if err != nil {
exit(err)
}
return s
}
nextInt32 := func() int32 {
i32, err := buf.ReadInt32(b)
if err != nil {
exit(err)
}
return i32
}
nextInt64 := func() int64 {
i64, err := readInt64(b)
if err != nil {
exit(err)
}
return i64
}
nextUint64 := func() uint64 {
ui64, err := readUint64(b)
if err != nil {
exit(err)
}
return ui64
}
dst.LogTime = nextString()
dst.UserName = nextNullableString()
dst.DatabaseName = nextNullableString()
dst.Pid = nextInt32()
dst.ClientAddr = nextNullableString()
dst.SessionID = nextString()
dst.SeqNum = nextInt64()
dst.PsDisplay = nextNullableString()
dst.SessionStart = nextString()
dst.Vxid = nextNullableString()
dst.Txid = nextUint64()
dst.ELevel = nextInt32()
dst.SQLState = nextNullableString()
dst.ErrMessage = nextNullableString()
dst.ErrDetail = nextNullableString()
dst.ErrHint = nextNullableString()
dst.InternalQuery = nextNullableString()
dst.InternalQueryPos = nextInt32()
dst.ErrContext = nextNullableString()
dst.UserQuery = nextNullableString()
dst.UserQueryPos = nextInt32()
dst.FileErrPos = nextNullableString()
dst.ApplicationName = nextNullableString()
if b.Len() != 0 {
exit("LogRecord message has mismatched "+
"length header and cString contents: remaining %d",
b.Len())
}
}