/
dbm.go
196 lines (175 loc) · 3.46 KB
/
dbm.go
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package dbm
import (
"errors"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/Centny/gwf/log"
"github.com/Centny/gwf/util"
)
var ShowLog bool = false
var ShowLogTime int64 = 8000
func slog(format string, args ...interface{}) {
if ShowLog {
log.D_(-1, format, args...)
}
}
type DbH interface {
Ping(db interface{}) error
Create() (interface{}, error)
// Close(db interface{})
String() string
}
var Closed = errors.New("Closed explicitly")
type MDb struct {
H DbH
DB interface{}
Active bool
Hited uint64
lck *sync.RWMutex
ping int32
last int64
log_time int64
}
func NewMDb(h DbH) (*MDb, error) {
db, err := h.Create()
mdb := &MDb{
H: h,
DB: db,
Active: true,
Hited: 0,
ping: 0,
lck: &sync.RWMutex{},
}
return mdb, err
}
func (m *MDb) Db() interface{} {
return m.DB
}
func (m *MDb) TPing() {
var showlog = ShowLog && (util.Now()-m.log_time > ShowLogTime)
if showlog {
m.log_time = util.Now()
log.D("MDb start ping to %v ", m.String())
}
err := m.H.Ping(m.DB)
if err == nil || err.Error() != "Closed explicitly" {
if err == nil {
if showlog {
log.D("MDb ping to %v success", m.String())
}
} else {
log.E("MDb ping to %v error->%v, will mark to not active", m.String(), err)
}
m.lck.Lock()
m.Active = err == nil
m.ping = 0
m.lck.Unlock()
return
}
// m.H.Close(m.DB)
//do reconnect
log.E("MDb ping to %v error->%v, will try reconnect", m.String(), err)
for {
db, err := m.H.Create()
if err == nil {
log.D("MDb connect to %v success, will mark to active", m.String())
m.lck.Lock()
m.DB = db
m.ping = 0
m.Active = true
m.lck.Unlock()
break
} else {
log.E("MDb connect to %v error->%v, will retry after 5s", m.String(), err)
time.Sleep(5 * time.Second)
}
}
}
func (m *MDb) IsActive() bool {
m.lck.RLock()
defer m.lck.RUnlock()
return m.Active
}
func (m *MDb) String() string {
return fmt.Sprintf("DB(%v),Active(%v),Hited(%v)", m.H.String(), m.Active, m.Hited)
}
type MDbs struct {
Dbs []*MDb
onum uint32
Timeout int64
Delay int64
Running bool
}
func NewMDbs2() *MDbs {
var mdbs = &MDbs{
Timeout: 30000,
Delay: 3000,
}
// mdbs.StartLoop()
return mdbs
}
func NewMDbs(h DbH) (*MDbs, error) {
mdbs := &MDbs{
Timeout: 30000,
Delay: 3000,
}
// mdbs.StartLoop()
mdb, err := NewMDb(h)
if err == nil {
mdbs.Add(mdb)
}
return mdbs, err
}
func (m *MDbs) Add(mdb ...*MDb) {
m.Dbs = append(m.Dbs, mdb...)
m.StartLoop()
}
func (m *MDbs) Db() interface{} {
return m.SelMDb().Db()
}
func (m *MDbs) SelMDb() *MDb {
all := len(m.Dbs)
if all < 1 {
panic("database session list is empty, please add at last one")
}
tidx := atomic.AddUint32(&m.onum, 1)
bidx := int(tidx % uint32(all))
beg := util.Now()
for {
for i := 0; i < all; i++ {
mdb := m.Dbs[(bidx+i)%all]
if mdb.IsActive() {
atomic.AddUint64(&mdb.Hited, 1)
return mdb
}
}
log.W("MDbs all session is not active, it will retry after 1s")
time.Sleep(time.Second)
if util.Now()-beg > m.Timeout {
break
}
}
panic(fmt.Sprintf("MDbs wait database active timeout(%vms)", m.Timeout))
}
func (m *MDbs) LoopPing() {
log.D("MDbs loop ping is started...")
for m.Running {
for _, mdb := range m.Dbs {
if mdb.ping < 1 {
mdb.ping = 1
go mdb.TPing()
}
}
time.Sleep(time.Duration(m.Delay) * time.Millisecond)
}
log.D("MDbs loop ping is stopped...")
}
func (m *MDbs) StartLoop() {
if m.Running {
return
}
m.Running = true
go m.LoopPing()
}