func (c *ClientConn) handleAdmin(admin *sqlparser.Admin) error {
var err error
var result *mysql.Resultset
region := sqlparser.String(admin.Region)
err = c.checkCmdOrder(region, admin.Columns)
if err != nil {
return err
}
switch strings.ToLower(region) {
case NodeRegion:
err = c.handleNodeCmd(admin.Rows)
case ServerRegion:
result, err = c.handleServerCmd(admin.Rows)
default:
return fmt.Errorf("admin %s not supported now", region)
}
if err != nil {
golog.Error("ClientConn", "handleAdmin", err.Error(),
c.connectionId, "sql", sqlparser.String(admin))
return err
}
if result != nil {
return c.writeResultset(c.status, result)
}
return c.writeOK(nil)
}
func (r *Router) buildReplacePlan(statement sqlparser.Statement) (*Plan, error) {
plan := &Plan{}
stmt := statement.(*sqlparser.Replace)
if _, ok := stmt.Rows.(sqlparser.SelectStatement); ok {
panic(sqlparser.NewParserError("select in replace not allowed"))
}
plan.Rule = r.GetRule(sqlparser.String(stmt.Table))
plan.Criteria = plan.checkValuesType(stmt.Rows.(sqlparser.Values))
plan.TableIndexs = makeList(0, len(plan.Rule.TableToNode))
err := plan.calRouteIndexs()
if err != nil {
golog.Error("Route", "BuildReplacePlan", err.Error(), 0)
return nil, err
}
err = r.generateReplaceSql(plan, stmt)
if err != nil {
return nil, err
}
return plan, nil
}
func (r *Router) buildDeletePlan(statement sqlparser.Statement) (*Plan, error) {
plan := &Plan{}
var where *sqlparser.Where
stmt := statement.(*sqlparser.Delete)
plan.Rule = r.GetRule(sqlparser.String(stmt.Table))
where = stmt.Where
if where != nil {
plan.Criteria = where.Expr /*路由条件*/
} else {
plan.Rule = r.DefaultRule
}
plan.TableIndexs = makeList(0, len(plan.Rule.TableToNode))
err := plan.calRouteIndexs()
if err != nil {
golog.Error("Route", "BuildDeletePlan", err.Error(), 0)
return nil, err
}
if plan.Rule.Type != DefaultRuleType && len(plan.RouteTableIndexs) == 0 {
golog.Error("Route", "BuildDeletePlan", errors.ErrNoCriteria.Error(), 0)
return nil, errors.ErrNoCriteria
}
//generate sql,如果routeTableindexs为空则表示不分表，不分表则发default node
err = r.generateDeleteSql(plan, stmt)
if err != nil {
return nil, err
}
return plan, nil
}
func (r *Router) buildInsertPlan(statement sqlparser.Statement) (*Plan, error) {
plan := &Plan{}
stmt := statement.(*sqlparser.Insert)
if _, ok := stmt.Rows.(sqlparser.SelectStatement); ok {
return nil, errors.ErrSelectInInsert
}
/*根据sql语句的表，获得对应的分片规则*/
plan.Rule = r.GetRule(sqlparser.String(stmt.Table))
if stmt.OnDup != nil {
err := plan.Rule.checkUpdateExprs(sqlparser.UpdateExprs(stmt.OnDup))
if err != nil {
return nil, err
}
}
plan.Criteria = plan.checkValuesType(stmt.Rows.(sqlparser.Values))
plan.TableIndexs = makeList(0, len(plan.Rule.TableToNode))
err := plan.calRouteIndexs()
if err != nil {
golog.Error("Route", "BuildInsertPlan", err.Error(), 0)
return nil, err
}
err = r.generateInsertSql(plan, stmt)
if err != nil {
return nil, err
}
return plan, nil
}
func (c *ClientConn) handleUseDB(stmt *sqlparser.UseDB) error {
if len(stmt.DB) == 0 {
return fmt.Errorf("must have database, not %s", sqlparser.String(stmt))
}
c.db = string(stmt.DB)
return c.writeOK(nil)
}
func (r *Router) buildSelectPlan(statement sqlparser.Statement) (*Plan, error) {
plan := &Plan{}
var where *sqlparser.Where
var tableName string
stmt := statement.(*sqlparser.Select)
switch v := (stmt.From[0]).(type) {
case *sqlparser.AliasedTableExpr:
tableName = sqlparser.String(v.Expr)
case *sqlparser.JoinTableExpr:
if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
tableName = sqlparser.String(ate.Expr)
} else {
tableName = sqlparser.String(v)
}
default:
tableName = sqlparser.String(v)
}
plan.Rule = r.GetRule(tableName) //根据表名获得分表规则
where = stmt.Where
if where != nil {
plan.Criteria = where.Expr /*路由条件*/
} else {
plan.Rule = r.DefaultRule
}
plan.TableIndexs = makeList(0, len(plan.Rule.TableToNode))
err := plan.calRouteIndexs()
if err != nil {
golog.Error("Route", "BuildSelectPlan", err.Error(), 0)
return nil, err
}
if plan.Rule.Type != DefaultRuleType && len(plan.RouteTableIndexs) == 0 {
golog.Error("Route", "BuildSelectPlan", errors.ErrNoCriteria.Error(), 0)
return nil, errors.ErrNoCriteria
}
//generate sql,如果routeTableindexs为空则表示不分表，不分表则发default node
err = r.generateSelectSql(plan, stmt)
if err != nil {
return nil, err
}
return plan, nil
}
func (c *ClientConn) handleServerCmd(rows sqlparser.InsertRows) (*mysql.Resultset, error) {
var err error
var result *mysql.Resultset
var opt, k, v string
vals := rows.(sqlparser.Values)
if len(vals) == 0 {
return nil, errors.ErrCmdUnsupport
}
tuple := vals[0].(sqlparser.ValTuple)
if len(tuple) != len(cmdServerOrder) {
return nil, errors.ErrCmdUnsupport
}
opt = sqlparser.String(tuple[0])
opt = strings.Trim(opt, "'")
k = sqlparser.String(tuple[1])
k = strings.Trim(k, "'")
v = sqlparser.String(tuple[2])
v = strings.Trim(v, "'")
switch strings.ToLower(opt) {
case ADMIN_OPT_SHOW:
result, err = c.handleAdminShow(k, v)
default:
err = errors.ErrCmdUnsupport
golog.Error("ClientConn", "handleNodeCmd", err.Error(),
c.connectionId, "opt", opt)
}
if err != nil {
return nil, err
}
return result, nil
}
func (c *ClientConn) handleSetNames(val sqlparser.ValExpr) error {
value := sqlparser.String(val)
value = strings.Trim(value, "'`\"")
charset := strings.ToLower(value)
if charset == "null" {
return c.writeOK(nil)
}
cid, ok := mysql.CharsetIds[charset]
if !ok {
return fmt.Errorf("invalid charset %s", charset)
}
c.charset = charset
c.collation = cid
return c.writeOK(nil)
}
func (c *ClientConn) checkCmdOrder(region string, columns sqlparser.Columns) error {
var cmdOrder []string
node := sqlparser.SelectExprs(columns)
switch region {
case NodeRegion:
cmdOrder = cmdNodeOrder
case ServerRegion:
cmdOrder = cmdServerOrder
default:
return errors.ErrCmdUnsupport
}
for i := 0; i < len(node); i++ {
val := sqlparser.String(node[i])
if val != cmdOrder[i] {
return errors.ErrCmdUnsupport
}
}
return nil
}
func (r *Router) generateSelectSql(plan *Plan, stmt sqlparser.Statement) error {
sqls := make(map[string][]string)
node, ok := stmt.(*sqlparser.Select)
if ok == false {
return errors.ErrStmtConvert
}
if len(plan.RouteNodeIndexs) == 0 {
return errors.ErrNoRouteNode
}
if len(plan.RouteTableIndexs) == 0 {
buf := sqlparser.NewTrackedBuffer(nil)
stmt.Format(buf)
nodeName := r.Nodes[0]
sqls[nodeName] = []string{buf.String()}
} else {
tableCount := len(plan.RouteTableIndexs)
for i := 0; i < tableCount; i++ {
buf := sqlparser.NewTrackedBuffer(nil)
buf.Fprintf("select %v%s%v from ",
node.Comments,
node.Distinct,
node.SelectExprs,
)
switch v := (node.From[0]).(type) {
case *sqlparser.AliasedTableExpr:
if len(v.As) != 0 {
fmt.Fprintf(buf, "%s_%04d AS %s",
sqlparser.String(v.Expr),
plan.RouteTableIndexs[i],
string(v.As),
)
} else {
fmt.Fprintf(buf, "%s_%04d",
sqlparser.String(v.Expr),
plan.RouteTableIndexs[i],
)
}
case *sqlparser.JoinTableExpr:
if ate, ok := (v.LeftExpr).(*sqlparser.AliasedTableExpr); ok {
if len(ate.As) != 0 {
fmt.Fprintf(buf, "%s_%04d AS %s",
sqlparser.String(ate.Expr),
plan.RouteTableIndexs[i],
string(ate.As),
)
} else {
fmt.Fprintf(buf, "%s_%04d",
sqlparser.String(ate.Expr),
plan.RouteTableIndexs[i],
)
}
} else {
fmt.Fprintf(buf, "%s_%04d",
sqlparser.String(v.LeftExpr),
plan.RouteTableIndexs[i],
)
}
buf.Fprintf(" %s %v", v.Join, v.RightExpr)
if v.On != nil {
buf.Fprintf(" on %v", v.On)
}
default:
fmt.Fprintf(buf, "%s_%04d",
sqlparser.String(node.From[0]),
plan.RouteTableIndexs[i],
)
}
buf.Fprintf("%v%v%v%v%v%s",
node.Where,
node.GroupBy,
node.Having,
node.OrderBy,
node.Limit,
node.Lock,
)
tableIndex := plan.RouteTableIndexs[i]
nodeIndex := plan.Rule.TableToNode[tableIndex]
nodeName := r.Nodes[nodeIndex]
if _, ok := sqls[nodeName]; ok == false {
sqls[nodeName] = make([]string, 0, tableCount)
}
sqls[nodeName] = append(sqls[nodeName], buf.String())
}
}
plan.RewrittenSqls = sqls
return nil
}
func (c *ClientConn) handleNodeCmd(rows sqlparser.InsertRows) error {
var err error
var opt, nodeName, role, addr string
vals := rows.(sqlparser.Values)
if len(vals) == 0 {
return errors.ErrCmdUnsupport
}
tuple := vals[0].(sqlparser.ValTuple)
if len(tuple) != len(cmdNodeOrder) {
return errors.ErrCmdUnsupport
}
opt = sqlparser.String(tuple[0])
opt = strings.Trim(opt, "'")
nodeName = sqlparser.String(tuple[1])
nodeName = strings.Trim(nodeName, "'")
if nodeName != c.user {
nodeName = c.user
}
role = sqlparser.String(tuple[2])
role = strings.Trim(role, "'")
addr = sqlparser.String(tuple[3])
addr = strings.Trim(addr, "'")
switch strings.ToLower(opt) {
case ADMIN_OPT_ADD:
err = c.AddDatabase(
nodeName,
role,
addr,
)
case ADMIN_OPT_DEL:
err = c.DeleteDatabase(
nodeName,
role,
addr,
)
case ADMIN_OPT_UP:
err = c.UpDatabase(
nodeName,
role,
addr,
)
case ADMIN_OPT_DOWN:
err = c.DownDatabase(
nodeName,
role,
addr,
)
default:
err = errors.ErrCmdUnsupport
golog.Error("ClientConn", "handleNodeCmd", err.Error(),
c.connectionId, "opt", opt)
}
return err
}