/
packageError.go
168 lines (138 loc) · 3.68 KB
/
packageError.go
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// SPDX-FileCopyrightText: 2020 SAP SE
// SPDX-FileCopyrightText: 2021 SAP SE
// SPDX-FileCopyrightText: 2022 SAP SE
// SPDX-FileCopyrightText: 2023 SAP SE
//
// SPDX-License-Identifier: Apache-2.0
package tds
import "fmt"
// ErrorPackage is a deprecated package used to communicate errors.
type ErrorPackage struct {
ErrorNumber int32
State uint8
Class uint8
ErrorMsg string
ServerName string
ProcName string
LineNr uint16
}
// ReadFrom implements the tds.Package interface.
func (pkg *ErrorPackage) ReadFrom(ch BytesChannel) error {
expectLength, err := ch.Uint16()
if err != nil {
return ErrNotEnoughBytes
}
pkg.ErrorNumber, err = ch.Int32()
if err != nil {
return ErrNotEnoughBytes
}
n := 4
msgLength, err := ch.Uint16()
if err != nil {
return ErrNotEnoughBytes
}
n += 2
pkg.ErrorMsg, err = ch.String(int(msgLength))
if err != nil {
return ErrNotEnoughBytes
}
n += int(msgLength)
serverLength, err := ch.Uint8()
if err != nil {
return ErrNotEnoughBytes
}
n++
pkg.ServerName, err = ch.String(int(serverLength))
if err != nil {
return ErrNotEnoughBytes
}
n += int(serverLength)
procLength, err := ch.Uint8()
if err != nil {
return ErrNotEnoughBytes
}
n++
pkg.ProcName, err = ch.String(int(procLength))
if err != nil {
return ErrNotEnoughBytes
}
n += int(procLength)
pkg.LineNr, err = ch.Uint16()
if err != nil {
return ErrNotEnoughBytes
}
n += 2
if n != int(expectLength) {
return fmt.Errorf("expected to read %d bytes, read %d bytes instead",
expectLength, n)
}
return nil
}
// WriteTo implements the tds.Package interface.
func (pkg ErrorPackage) WriteTo(ch BytesChannel) error {
if err := ch.WriteByte(byte(TDS_ERROR)); err != nil {
return fmt.Errorf("failed to write TDS Token %s: %w", TDS_ERROR, err)
}
// 4 errornumber
// 1 state
// 1 class
// 2 len(errormsg)
// x errormsg
// 1 len(servername)
// x servername
// 1 len(procname)
// x procname
// 2 linenr
expectLength := 12 + len(pkg.ErrorMsg) + len(pkg.ServerName) + len(pkg.ProcName)
if err := ch.WriteUint16(uint16(expectLength)); err != nil {
return fmt.Errorf("failed to write length: %w", err)
}
if err := ch.WriteInt32(pkg.ErrorNumber); err != nil {
return fmt.Errorf("failed to write error number: %w", err)
}
n := 4
if err := ch.WriteUint8(pkg.State); err != nil {
return fmt.Errorf("failed to write state: %w", err)
}
n++
if err := ch.WriteUint8(pkg.Class); err != nil {
return fmt.Errorf("failed to write class: %w", err)
}
n++
if err := ch.WriteUint16(uint16(len(pkg.ErrorMsg))); err != nil {
return fmt.Errorf("failed to write error message length: %w", err)
}
n += 2
if err := ch.WriteString(pkg.ErrorMsg); err != nil {
return fmt.Errorf("failed to write error message: %w", err)
}
n += len(pkg.ErrorMsg)
if err := ch.WriteUint8(uint8(len(pkg.ServerName))); err != nil {
return fmt.Errorf("failed to write servername length: %w", err)
}
n++
if err := ch.WriteString(pkg.ServerName); err != nil {
return fmt.Errorf("failed to write servername: %w", err)
}
n += len(pkg.ServerName)
if err := ch.WriteUint8(uint8(len(pkg.ProcName))); err != nil {
return fmt.Errorf("failed to write procname length: %w", err)
}
n++
if err := ch.WriteString(pkg.ProcName); err != nil {
return fmt.Errorf("failed to write procname: %w", err)
}
n += len(pkg.ProcName)
if err := ch.WriteUint16(pkg.LineNr); err != nil {
return fmt.Errorf("failed to write linenr: %w", err)
}
n += 2
if n != expectLength {
return fmt.Errorf("expected to write %d bytes, wrote %d bytes instead",
expectLength, n)
}
return nil
}
func (pkg ErrorPackage) String() string {
return fmt.Sprintf("%T(%d: %s)", pkg, pkg.ErrorNumber, pkg.ErrorMsg)
}