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session.go
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/*
* go-mysqlstack
* xelabs.org
*
* Copyright (c) XeLabs
* GPL License
*
*/
package driver
import (
"fmt"
"net"
"sync"
"github.com/xelabs/go-mysqlstack/common"
"github.com/xelabs/go-mysqlstack/packet"
"github.com/xelabs/go-mysqlstack/proto"
"github.com/xelabs/go-mysqlstack/sqldb"
"github.com/xelabs/go-mysqlstack/xlog"
"github.com/xelabs/go-mysqlstack/sqlparser/depends/sqltypes"
)
// Session is a client connection with greeting and auth.
type Session struct {
id uint32
mu sync.RWMutex
log *xlog.Log
conn net.Conn
schema string
auth *proto.Auth
packets *packet.Packets
greeting *proto.Greeting
}
func newSession(log *xlog.Log, ID uint32, conn net.Conn) *Session {
return &Session{
id: ID,
log: log,
conn: conn,
auth: proto.NewAuth(),
greeting: proto.NewGreeting(ID),
packets: packet.NewPackets(conn),
}
}
func (s *Session) writeErrFromError(err error) error {
if se, ok := err.(*sqldb.SQLError); ok {
return s.packets.WriteERR(se.Num, se.State, "%v", se.Message)
}
unknow := sqldb.NewSQLError(sqldb.ER_UNKNOWN_ERROR, "%v", err)
return s.packets.WriteERR(unknow.Num, unknow.State, unknow.Message)
}
func (s *Session) writeFields(result *sqltypes.Result) error {
// 1. Write columns.
if err := s.packets.AppendColumns(result.Fields); err != nil {
return err
}
if (s.auth.ClientFlags() & sqldb.CLIENT_DEPRECATE_EOF) == 0 {
if err := s.packets.AppendEOF(); err != nil {
return err
}
}
return nil
}
func (s *Session) writeRows(result *sqltypes.Result) error {
// 2. Append rows.
for _, row := range result.Rows {
rowBuf := common.NewBuffer(16)
for _, val := range row {
if val.IsNull() {
rowBuf.WriteLenEncodeNUL()
} else {
rowBuf.WriteLenEncodeBytes(val.Raw())
}
}
if err := s.packets.Append(rowBuf.Datas()); err != nil {
return err
}
}
return nil
}
func (s *Session) writeFinish(result *sqltypes.Result) error {
// 3. Write EOF.
if (s.auth.ClientFlags() & sqldb.CLIENT_DEPRECATE_EOF) == 0 {
if err := s.packets.AppendEOF(); err != nil {
return err
}
} else {
if err := s.packets.AppendOKWithEOFHeader(result.RowsAffected, result.InsertID, s.greeting.Status(), result.Warnings); err != nil {
return err
}
}
return nil
}
func (s *Session) flush() error {
// 4. Write to stream.
return s.packets.Flush()
}
func (s *Session) writeResult(result *sqltypes.Result) error {
if len(result.Fields) == 0 {
if result.State == sqltypes.RStateNone {
// This is just an INSERT result, send an OK packet.
return s.packets.WriteOK(result.RowsAffected, result.InsertID, s.greeting.Status(), result.Warnings)
}
return fmt.Errorf("unexpected: result.without.no.fields.but.has.rows.result:%+v", result)
}
switch result.State {
case sqltypes.RStateNone:
if err := s.writeFields(result); err != nil {
return err
}
if err := s.writeRows(result); err != nil {
return err
}
if err := s.writeFinish(result); err != nil {
return err
}
case sqltypes.RStateFields:
if err := s.writeFields(result); err != nil {
return err
}
case sqltypes.RStateRows:
if err := s.writeRows(result); err != nil {
return err
}
case sqltypes.RStateFinished:
if err := s.writeFinish(result); err != nil {
return err
}
}
return s.flush()
}
// Close used to close the connection.
func (s *Session) Close() {
s.mu.RLock()
defer s.mu.RUnlock()
if s.conn != nil {
s.conn.Close()
s.conn = nil
}
}
// ID returns the connection ID.
func (s *Session) ID() uint32 {
s.mu.RLock()
defer s.mu.RUnlock()
return s.id
}
// Addr returns the remote address.
func (s *Session) Addr() string {
s.mu.RLock()
defer s.mu.RUnlock()
if s.conn != nil {
return s.conn.RemoteAddr().String()
}
return "unknow"
}
// SetSchema used to set the schema.
func (s *Session) SetSchema(schema string) {
s.mu.Lock()
defer s.mu.Unlock()
s.schema = schema
}
// Schema returns the schema.
func (s *Session) Schema() string {
s.mu.RLock()
defer s.mu.RUnlock()
return s.schema
}
// User returns the user of auth.
func (s *Session) User() string {
s.mu.RLock()
defer s.mu.RUnlock()
return s.auth.User()
}
// Salt returns the salt of greeting.
func (s *Session) Salt() []byte {
s.mu.RLock()
defer s.mu.RUnlock()
return s.greeting.Salt
}
// Scramble returns the scramble of auth.
func (s *Session) Scramble() []byte {
s.mu.RLock()
defer s.mu.RUnlock()
return s.auth.AuthResponse()
}
// Charset returns the charset of auth.
func (s *Session) Charset() uint8 {
s.mu.RLock()
defer s.mu.RUnlock()
return s.auth.Charset()
}