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resp.go
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resp.go
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// Copyright 2014 The go-mysql Authors. All rights reserved.
// Use of this source code is governed by a MIT License
// that can be found in the LICENSES/go-mysql-LICENSE file.
// Copyright 2018 The kingbus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mysql
import (
"fmt"
gomysql "github.com/siddontang/go-mysql/mysql"
)
func (c *Conn) writeOK(r *gomysql.Result) error {
if r == nil {
r = &gomysql.Result{}
}
r.Status |= c.status
data := make([]byte, 4, 32)
data = append(data, gomysql.OK_HEADER)
data = append(data, gomysql.PutLengthEncodedInt(r.AffectedRows)...)
data = append(data, gomysql.PutLengthEncodedInt(r.InsertId)...)
if c.capability&gomysql.CLIENT_PROTOCOL_41 > 0 {
data = append(data, byte(r.Status), byte(r.Status>>8))
data = append(data, 0, 0)
}
return c.WritePacket(data)
}
func (c *Conn) writeError(e error) error {
var m *gomysql.MyError
var ok bool
if m, ok = e.(*gomysql.MyError); !ok {
m = gomysql.NewError(gomysql.ER_UNKNOWN_ERROR, e.Error())
}
data := make([]byte, 4, 16+len(m.Message))
data = append(data, gomysql.ERR_HEADER)
data = append(data, byte(m.Code), byte(m.Code>>8))
if c.capability&gomysql.CLIENT_PROTOCOL_41 > 0 {
data = append(data, '#')
data = append(data, m.State...)
}
data = append(data, m.Message...)
return c.WritePacket(data)
}
func (c *Conn) writeEOF() error {
data := make([]byte, 4, 9)
data = append(data, gomysql.EOF_HEADER)
if c.capability&gomysql.CLIENT_PROTOCOL_41 > 0 {
data = append(data, 0, 0)
data = append(data, byte(c.status), byte(c.status>>8))
}
return c.WritePacket(data)
}
func (c *Conn) writeResultset(r *gomysql.Resultset) error {
columnLen := gomysql.PutLengthEncodedInt(uint64(len(r.Fields)))
data := make([]byte, 4, 1024)
data = append(data, columnLen...)
if err := c.WritePacket(data); err != nil {
return err
}
for _, v := range r.Fields {
data = data[0:4]
data = append(data, v.Dump()...)
if err := c.WritePacket(data); err != nil {
return err
}
}
if err := c.writeEOF(); err != nil {
return err
}
for _, v := range r.RowDatas {
data = data[0:4]
data = append(data, v...)
if err := c.WritePacket(data); err != nil {
return err
}
}
if err := c.writeEOF(); err != nil {
return err
}
return nil
}
func (c *Conn) writeFieldList(fs []*gomysql.Field) error {
data := make([]byte, 4, 1024)
for _, v := range fs {
data = data[0:4]
data = append(data, v.Dump()...)
if err := c.WritePacket(data); err != nil {
return err
}
}
if err := c.writeEOF(); err != nil {
return err
}
return nil
}
type noResponse struct{}
func (c *Conn) writeValue(value interface{}) error {
switch v := value.(type) {
case noResponse:
return nil
case error:
return c.writeError(v)
case nil:
return c.writeOK(nil)
case *gomysql.Result:
if v != nil && v.Resultset != nil {
return c.writeResultset(v.Resultset)
}
return c.writeOK(v)
case []*gomysql.Field:
return c.writeFieldList(v)
default:
return fmt.Errorf("invalid response type %T", value)
}
}