forked from 200lab-Education/go-sdk
/
mongo.go
168 lines (141 loc) · 3.48 KB
/
mongo.go
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/*
* @author Viet Tran <viettranx@gmail.com>
* @copyright 2019 Viet Tran <viettranx@gmail.com>
* @license Apache-2.0
*/
package sdkmgo
import (
"context"
"flag"
"github.com/globalsign/mgo"
"github.com/leductoan3082004/go-sdk/logger"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"math"
"sync"
"time"
)
var (
defaultDBName = "defaultMongoDB"
DefaultMongoDB = getDefaultMongoDB()
)
const retryCount = 10
type MongoDBOpt struct {
MgoUri string
Prefix string
PingInterval int // in seconds
}
type mongoDB struct {
name string
logger logger.Logger
session *mongo.Client
isRunning bool
once *sync.Once
*MongoDBOpt
}
func getDefaultMongoDB() *mongoDB {
return NewMongoDB(defaultDBName, "")
}
func NewMongoDB(name, prefix string) *mongoDB {
return &mongoDB{
MongoDBOpt: &MongoDBOpt{
Prefix: prefix,
},
name: name,
isRunning: false,
once: new(sync.Once),
}
}
func (mgDB *mongoDB) GetPrefix() string {
return mgDB.Prefix
}
func (mgDB *mongoDB) Name() string {
return mgDB.name
}
func (mgDB *mongoDB) InitFlags() {
prefix := mgDB.Prefix
if mgDB.Prefix != "" {
prefix += "-"
}
flag.StringVar(&mgDB.MgoUri, prefix+"mgo-uri", "", "MongoDB connection-string. Ex: mongodb://...")
flag.IntVar(&mgDB.PingInterval, prefix+"mgo-ping-interval", 5, "MongoDB ping check interval")
}
func (mgDB *mongoDB) isDisabled() bool {
return mgDB.MgoUri == ""
}
func (mgDB *mongoDB) Configure() error {
if mgDB.isDisabled() || mgDB.isRunning {
return nil
}
mgDB.logger = logger.GetCurrent().GetLogger(mgDB.name)
mgDB.logger.Info("Connect to Mongodb at ", mgDB.MgoUri, " ...")
var err error
mgDB.session, err = mgDB.getConnWithRetry(retryCount)
if err != nil {
mgDB.logger.Error("Error connect to mongodb at ", mgDB.MgoUri, ". ", err.Error())
return err
}
mgDB.isRunning = true
return nil
}
func (mgDB *mongoDB) Cleanup() {
}
func (mgDB *mongoDB) Run() error {
return mgDB.Configure()
}
func (mgDB *mongoDB) Stop() <-chan bool {
if mgDB.session != nil {
_ = mgDB.session.Disconnect(context.Background())
}
mgDB.isRunning = false
c := make(chan bool)
go func() { c <- true }()
return c
}
func (mgDB *mongoDB) Get() interface{} {
mgDB.once.Do(func() {
if !mgDB.isRunning && !mgDB.isDisabled() {
if db, err := mgDB.getConnWithRetry(math.MaxInt32); err == nil {
mgDB.session = db
mgDB.isRunning = true
} else {
mgDB.logger.Fatalf("%s connection cannot reconnect\n", mgDB.name)
}
}
})
if mgDB.session == nil {
return nil
}
return mgDB.session
}
func (mgDB *mongoDB) getConnWithRetry(retryCount int) (*mongo.Client, error) {
db, err := mongo.Connect(context.Background(), options.Client().ApplyURI(mgDB.MgoUri))
if err != nil {
for {
time.Sleep(time.Second * 1)
mgDB.logger.Errorf("Retry to connect %s.\n", mgDB.name)
db, err = mongo.Connect(context.Background(), options.Client().ApplyURI(mgDB.MgoUri))
if err == nil {
go mgDB.reconnectIfNeeded()
break
}
}
} else {
go mgDB.reconnectIfNeeded()
}
return db, err
}
func (mgDB *mongoDB) reconnectIfNeeded() {
conn := mgDB.session
for {
if err := conn.Ping(context.Background(), nil); err != nil {
_ = conn.Disconnect(context.Background())
mgDB.logger.Errorf("%s connection is gone, try to reconnect\n", mgDB.name)
mgDB.isRunning = false
mgDB.once = new(sync.Once)
mgDB.Get().(*mgo.Session).Close()
return
}
time.Sleep(time.Second * time.Duration(mgDB.PingInterval))
}
}