/
scatter.go
257 lines (222 loc) · 6.15 KB
/
scatter.go
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/*
* NeoDB
*
* Copyright 2018 The Radon Authors.
* Copyright 2021-2030 The NeoDB Authors.
* Code is licensed under the GPLv3.
*
*/
package backend
import (
"io/ioutil"
"os"
"path"
"sort"
"sync"
"github.com/sealdb/neodb/config"
"github.com/sealdb/neodb/monitor"
"github.com/pkg/errors"
"github.com/sealdb/mysqlstack/xlog"
)
const (
backendjson = "backend.json"
)
// Scatter tuple.
type Scatter struct {
log *xlog.Log
mu sync.RWMutex
txnMgr *TxnManager
metadir string
backends map[string]*Poolz
}
// NewScatter creates a new scatter.
func NewScatter(log *xlog.Log, metadir string) *Scatter {
return &Scatter{
log: log,
txnMgr: NewTxnManager(log),
metadir: metadir,
backends: make(map[string]*Poolz),
}
}
// Init is used to init the xaCheck and start the xaCheck thread.
func (scatter *Scatter) Init(scatterConf *config.ScatterConfig) error {
return scatter.txnMgr.Init(scatter, scatterConf)
}
// Add backend node.
func (scatter *Scatter) add(config *config.BackendConfig) error {
log := scatter.log
log.Info("scatter.add:%v", config.Name)
if _, ok := scatter.backends[config.Name]; ok {
return errors.Errorf("scatter.backend[%v].duplicate", config.Name)
}
// check the address in backendsConfig, fix issue#546.
for _, pool := range scatter.backends {
if pool.conf.Address == config.Address {
return errors.Errorf("scatter.address[%v].already.exists.in.backends", config.Address)
}
}
scatter.backends[config.Name] = NewPoolz(log, config)
monitor.BackendInc("backend")
return nil
}
// Add used to add a new backend to scatter.
func (scatter *Scatter) Add(config *config.BackendConfig) error {
scatter.mu.Lock()
defer scatter.mu.Unlock()
return scatter.add(config)
}
func (scatter *Scatter) remove(config *config.BackendConfig) error {
log := scatter.log
log.Warning("scatter.remove:%v", config.Name)
pool, ok := scatter.backends[config.Name]
if !ok {
return errors.Errorf("scatter.backend[%v].can.not.be.found", config.Name)
}
delete(scatter.backends, config.Name)
monitor.BackendDec("backend")
pool.Close()
return nil
}
// Remove used to remove a backend from the scatter.
func (scatter *Scatter) Remove(config *config.BackendConfig) error {
scatter.mu.Lock()
defer scatter.mu.Unlock()
return scatter.remove(config)
}
// Close used to clean the pools connections.
func (scatter *Scatter) Close() {
scatter.mu.Lock()
defer scatter.mu.Unlock()
log := scatter.log
log.Info("scatter.prepare.to.close....")
scatter.clear()
// to close the xaCheck go
scatter.txnMgr.Close()
log.Info("scatter.close.done....")
}
func (scatter *Scatter) clear() {
for _, v := range scatter.backends {
v.Close()
}
scatter.backends = make(map[string]*Poolz)
}
// FlushConfig used to write the backends to file.
func (scatter *Scatter) FlushConfig() error {
scatter.mu.Lock()
defer scatter.mu.Unlock()
log := scatter.log
file := path.Join(scatter.metadir, backendjson)
var backends config.BackendsConfig
for _, v := range scatter.backends {
backends.Backends = append(backends.Backends, v.conf)
}
log.Warning("scatter.flush.to.file[%v].backends.conf:%+v", file, backends.Backends)
if err := config.WriteConfig(file, backends); err != nil {
log.Panicf("scatter.flush.config.to.file[%v].error:%v", file, err)
return err
}
if err := config.UpdateVersion(scatter.metadir); err != nil {
log.Panicf("scatter.flush.config.update.version.error:%v", err)
return err
}
return nil
}
// LoadConfig used to load all backends from metadir/backend.json file.
func (scatter *Scatter) LoadConfig() error {
scatter.mu.Lock()
defer scatter.mu.Unlock()
// Do clear first.
scatter.clear()
log := scatter.log
metadir := scatter.metadir
file := path.Join(metadir, backendjson)
// Create it if the backends config not exists.
if _, err := os.Stat(file); os.IsNotExist(err) {
backends := config.BackendsConfig{}
if err := config.WriteConfig(file, backends); err != nil {
log.Error("scatter.flush.backends.to.file[%v].error:%v", file, err)
return err
}
}
data, err := ioutil.ReadFile(file)
if err != nil {
log.Error("scatter.load.from.file[%v].error:%v", file, err)
return err
}
conf, err := config.ReadBackendsConfig(string(data))
if err != nil {
log.Error("scatter.parse.json.file[%v].error:%v", file, err)
return err
}
monitor.BackendSet("backend", 0)
for _, backend := range conf.Backends {
if err := scatter.add(backend); err != nil {
log.Error("scatter.add.backend[%+v].error:%v", backend.Name, err)
return err
}
log.Info("scatter.load.backend:%+v", backend.Name)
}
return nil
}
// AllBackends returns all backends.
func (scatter *Scatter) AllBackends() []string {
var backends []string
scatter.mu.RLock()
defer scatter.mu.RUnlock()
for k := range scatter.backends {
backends = append(backends, k)
}
sort.Strings(backends)
return backends
}
// Backends returns all normal backends.
func (scatter *Scatter) Backends() []string {
var backends []string
scatter.mu.RLock()
defer scatter.mu.RUnlock()
for k, pool := range scatter.backends {
if pool.conf.Role != config.NormalBackend {
continue
}
backends = append(backends, k)
}
sort.Strings(backends)
return backends
}
func (scatter *Scatter) CheckBackend(backenName string) bool {
scatter.mu.RLock()
defer scatter.mu.RUnlock()
for k, pool := range scatter.backends {
if pool.conf.Role != config.NormalBackend {
continue
}
if k == backenName {
return true
}
}
return false
}
// PoolzClone used to copy backends to new map.
func (scatter *Scatter) PoolzClone() map[string]*Poolz {
poolzMap := make(map[string]*Poolz)
scatter.mu.RLock()
defer scatter.mu.RUnlock()
for k, v := range scatter.backends {
poolzMap[k] = v
}
return poolzMap
}
// BackendConfigsClone used to clone all the backend configs.
func (scatter *Scatter) BackendConfigsClone() []*config.BackendConfig {
scatter.mu.RLock()
defer scatter.mu.RUnlock()
beConfigs := make([]*config.BackendConfig, 0, 16)
for _, v := range scatter.backends {
beConfigs = append(beConfigs, v.conf)
}
return beConfigs
}
// CreateTransaction used to create a transaction.
func (scatter *Scatter) CreateTransaction() (*Txn, error) {
return scatter.txnMgr.CreateTxn(scatter.PoolzClone())
}