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/*
* go-mysqlstack
* xelabs.org
*
* Copyright (c) XeLabs
* GPL License
*
*/
package driver
import (
"net"
"runtime"
"runtime/debug"
"github.com/xelabs/go-mysqlstack/common"
"github.com/xelabs/go-mysqlstack/sqldb"
"github.com/xelabs/go-mysqlstack/xlog"
"github.com/xelabs/go-mysqlstack/sqlparser/depends/sqltypes"
)
// Handler interface.
type Handler interface {
// NewSession is called when a session is coming.
NewSession(session *Session)
// SessionClosed is called when a session exit.
SessionClosed(session *Session)
// Check the session.
SessionCheck(session *Session) error
// Check the Auth request.
AuthCheck(session *Session) error
// Handle the cominitdb.
ComInitDB(session *Session, database string) error
// Handle the queries.
ComQuery(session *Session, query string, callback func(*sqltypes.Result) error) error
}
// Listener is a connection handler.
type Listener struct {
// Logger.
log *xlog.Log
address string
// Query handler.
handler Handler
// This is the main listener socket.
listener net.Listener
// Incrementing ID for connection id.
connectionID uint32
}
// NewListener creates a new Listener.
func NewListener(log *xlog.Log, address string, handler Handler) (*Listener, error) {
listener, err := net.Listen("tcp", address)
if err != nil {
return nil, err
}
return &Listener{
log: log,
address: address,
handler: handler,
listener: listener,
connectionID: 1,
}, nil
}
// Accept runs an accept loop until the listener is closed.
func (l *Listener) Accept() {
runtime.GOMAXPROCS(runtime.NumCPU())
for {
conn, err := l.listener.Accept()
if err != nil {
// Close() was probably called.
return
}
ID := l.connectionID
l.connectionID++
go l.handle(conn, ID)
}
}
func (l *Listener) parserComInitDB(data []byte) string {
return string(data[1:])
}
func (l *Listener) parserComQuery(data []byte) string {
// Trim the right.
data = data[1:]
last := len(data) - 1
if data[last] == ';' {
data = data[:last]
}
return common.BytesToString(data)
}
// handle is called in a go routine for each client connection.
func (l *Listener) handle(conn net.Conn, ID uint32) {
var err error
var data []byte
var authPkt []byte
var greetingPkt []byte
log := l.log
// Catch panics, and close the connection in any case.
defer func() {
conn.Close()
if x := recover(); x != nil {
log.Error("server.handle.panic:\n%v\n%s", x, debug.Stack())
}
}()
session := newSession(log, ID, conn)
// Session check.
if err = l.handler.SessionCheck(session); err != nil {
log.Warning("session[%v].check.failed.error:%+v", ID, err)
session.writeErrFromError(err)
return
}
// Session register.
l.handler.NewSession(session)
defer l.handler.SessionClosed(session)
// Greeting packet.
greetingPkt = session.greeting.Pack()
if err = session.packets.Write(greetingPkt); err != nil {
log.Error("server.write.greeting.packet.error: %v", err)
return
}
// Auth packet.
if authPkt, err = session.packets.Next(); err != nil {
log.Error("server.read.auth.packet.error: %v", err)
return
}
if err = session.auth.UnPack(authPkt); err != nil {
log.Error("server.unpack.auth.error: %v", err)
return
}
// Auth check.
if err = l.handler.AuthCheck(session); err != nil {
log.Warning("server.user[%+v].auth.check.failed", session.User())
session.writeErrFromError(err)
return
}
// Check the database.
db := session.auth.Database()
if db != "" {
if err = l.handler.ComInitDB(session, db); err != nil {
log.Error("server.cominitdb[%s].error:%+v", db, err)
session.writeErrFromError(err)
return
}
session.SetSchema(db)
}
if err = session.packets.WriteOK(0, 0, session.greeting.Status(), 0); err != nil {
return
}
for {
// Reset packet sequence ID.
session.packets.ResetSeq()
if data, err = session.packets.Next(); err != nil {
return
}
switch data[0] {
case sqldb.COM_QUIT:
return
case sqldb.COM_INIT_DB:
db := l.parserComInitDB(data)
if err = l.handler.ComInitDB(session, db); err != nil {
if werr := session.writeErrFromError(err); werr != nil {
return
}
} else {
session.SetSchema(db)
if err = session.packets.WriteOK(0, 0, session.greeting.Status(), 0); err != nil {
return
}
}
case sqldb.COM_PING:
if err = session.packets.WriteOK(0, 0, session.greeting.Status(), 0); err != nil {
return
}
case sqldb.COM_QUERY:
query := l.parserComQuery(data)
if err = l.handler.ComQuery(session, query, func(qr *sqltypes.Result) error {
return session.writeResult(qr)
}); err != nil {
log.Error("server.handle.query.from.session[%v].error:%+v.query[%s]", ID, err, query)
if werr := session.writeErrFromError(err); werr != nil {
return
}
continue
}
default:
cmd := sqldb.CommandString(data[0])
log.Error("session.command:%s.not.implemented", cmd)
sqlErr := sqldb.NewSQLError(sqldb.ER_UNKNOWN_ERROR, "command handling not implemented yet: %s", cmd)
if err := session.writeErrFromError(sqlErr); err != nil {
return
}
}
// Reset packet sequence ID.
session.packets.ResetSeq()
}
}
// Addr returns the client address.
func (l *Listener) Addr() string {
return l.address
}
// Close close the listener and all connections.
func (l *Listener) Close() {
l.listener.Close()
}