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// Copyright 2017 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"context"
"time"
"xorm.io/xorm/caches"
"xorm.io/xorm/contexts"
"xorm.io/xorm/dialects"
"xorm.io/xorm/log"
"xorm.io/xorm/names"
)
// EngineGroup defines an engine group
type EngineGroup struct {
*Engine
slaves []*Engine
policy GroupPolicy
}
// NewEngineGroup creates a new engine group
func NewEngineGroup(args1 interface{}, args2 interface{}, policies ...GroupPolicy) (*EngineGroup, error) {
var eg EngineGroup
if len(policies) > 0 {
eg.policy = policies[0]
} else {
eg.policy = RoundRobinPolicy()
}
driverName, ok1 := args1.(string)
conns, ok2 := args2.([]string)
if ok1 && ok2 {
engines := make([]*Engine, len(conns))
for i, conn := range conns {
engine, err := NewEngine(driverName, conn)
if err != nil {
return nil, err
}
engine.engineGroup = &eg
engines[i] = engine
}
eg.Engine = engines[0]
eg.slaves = engines[1:]
return &eg, nil
}
master, ok3 := args1.(*Engine)
slaves, ok4 := args2.([]*Engine)
if ok3 && ok4 {
master.engineGroup = &eg
for i := 0; i < len(slaves); i++ {
slaves[i].engineGroup = &eg
}
eg.Engine = master
eg.slaves = slaves
return &eg, nil
}
return nil, ErrParamsType
}
// Close the engine
func (eg *EngineGroup) Close() error {
err := eg.Engine.Close()
if err != nil {
return err
}
for i := 0; i < len(eg.slaves); i++ {
err := eg.slaves[i].Close()
if err != nil {
return err
}
}
return nil
}
// ContextHook returned a group session
func (eg *EngineGroup) Context(ctx context.Context) *Session {
sess := eg.NewSession()
sess.isAutoClose = true
return sess.Context(ctx)
}
// NewSession returned a group session
func (eg *EngineGroup) NewSession() *Session {
sess := eg.Engine.NewSession()
sess.sessionType = groupSession
return sess
}
// Master returns the master engine
func (eg *EngineGroup) Master() *Engine {
return eg.Engine
}
// Ping tests if database is alive
func (eg *EngineGroup) Ping() error {
if err := eg.Engine.Ping(); err != nil {
return err
}
for _, slave := range eg.slaves {
if err := slave.Ping(); err != nil {
return err
}
}
return nil
}
// SetColumnMapper set the column name mapping rule
func (eg *EngineGroup) SetColumnMapper(mapper names.Mapper) {
eg.Engine.SetColumnMapper(mapper)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetColumnMapper(mapper)
}
}
// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
func (eg *EngineGroup) SetConnMaxLifetime(d time.Duration) {
eg.Engine.SetConnMaxLifetime(d)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetConnMaxLifetime(d)
}
}
// SetDefaultCacher set the default cacher
func (eg *EngineGroup) SetDefaultCacher(cacher caches.Cacher) {
eg.Engine.SetDefaultCacher(cacher)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetDefaultCacher(cacher)
}
}
// SetLogger set the new logger
func (eg *EngineGroup) SetLogger(logger interface{}) {
eg.Engine.SetLogger(logger)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetLogger(logger)
}
}
func (eg *EngineGroup) AddHook(hook contexts.Hook) {
eg.Engine.AddHook(hook)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].AddHook(hook)
}
}
// SetLogLevel sets the logger level
func (eg *EngineGroup) SetLogLevel(level log.LogLevel) {
eg.Engine.SetLogLevel(level)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetLogLevel(level)
}
}
// SetMapper set the name mapping rules
func (eg *EngineGroup) SetMapper(mapper names.Mapper) {
eg.Engine.SetMapper(mapper)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetMapper(mapper)
}
}
// SetMaxIdleConns set the max idle connections on pool, default is 2
func (eg *EngineGroup) SetMaxIdleConns(conns int) {
eg.Engine.DB().SetMaxIdleConns(conns)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].DB().SetMaxIdleConns(conns)
}
}
// SetMaxOpenConns is only available for go 1.2+
func (eg *EngineGroup) SetMaxOpenConns(conns int) {
eg.Engine.DB().SetMaxOpenConns(conns)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].DB().SetMaxOpenConns(conns)
}
}
// SetPolicy set the group policy
func (eg *EngineGroup) SetPolicy(policy GroupPolicy) *EngineGroup {
eg.policy = policy
return eg
}
// SetQuotePolicy sets the special quote policy
func (eg *EngineGroup) SetQuotePolicy(quotePolicy dialects.QuotePolicy) {
eg.Engine.SetQuotePolicy(quotePolicy)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetQuotePolicy(quotePolicy)
}
}
// SetTableMapper set the table name mapping rule
func (eg *EngineGroup) SetTableMapper(mapper names.Mapper) {
eg.Engine.SetTableMapper(mapper)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].SetTableMapper(mapper)
}
}
// ShowSQL show SQL statement or not on logger if log level is great than INFO
func (eg *EngineGroup) ShowSQL(show ...bool) {
eg.Engine.ShowSQL(show...)
for i := 0; i < len(eg.slaves); i++ {
eg.slaves[i].ShowSQL(show...)
}
}
// Slave returns one of the physical databases which is a slave according the policy
func (eg *EngineGroup) Slave() *Engine {
switch len(eg.slaves) {
case 0:
return eg.Engine
case 1:
return eg.slaves[0]
}
return eg.policy.Slave(eg)
}
// Slaves returns all the slaves
func (eg *EngineGroup) Slaves() []*Engine {
return eg.slaves
}
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