Initial commit

common/mongos/client.go

@@ -0,0 +1,507 @@
+package mongos
+
+import (
+	"context"
+	"errors"
+	"reflect"
+	"stat/common/utils"
+	"strings"
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+type MongoTool struct {
+	db       *Manager
+	collName string
+}
+
+type PageAndSort struct {
+	Page     int64
+	PageSize int64
+	Sort     bson.M //bson.M{_id : -1 }
+}
+
+func New(db *Manager, collName string) *MongoTool {
+	return &MongoTool{db: db, collName: collName}
+}
+
+func (b *MongoTool) GetCollection() *mongo.Collection {
+	return b.collection()
+}
+
+func (b *MongoTool) collection() *mongo.Collection {
+	opts := options.CollectionOptions{Registry: Registry}
+	return b.db.Database().Collection(b.collName, &opts)
+}
+
+func (b *MongoTool) FindById(ctx context.Context, bind interface{}, id interface{}, opts ...*options.FindOneOptions) error {
+	param := bson.M{"_id": id}
+	return b.FindOne(ctx, bind, param, opts...)
+}
+
+func (b *MongoTool) FindOne(ctx context.Context, bind interface{}, query bson.M, opts ...*options.FindOneOptions) error {
+	err := b.collection().FindOne(ctx, query, opts...).Decode(bind)
+	if err != nil && err == mongo.ErrNoDocuments {
+		return nil
+	}
+	return err
+}
+
+func (b *MongoTool) FindOneEx(ctx context.Context, bind interface{}, query bson.M, opts ...*options.FindOneOptions) error {
+	err := b.collection().FindOne(ctx, query, opts...).Decode(bind)
+	return err
+}
+
+func (b *MongoTool) FindMOneAndUpdate(ctx context.Context, bind interface{}, query bson.M, update interface{}, opts ...*options.FindOneAndUpdateOptions) error {
+	setReturn := false
+	for _, opt := range opts {
+		if opt != nil && opt.ReturnDocument != nil {
+			setReturn = true
+			break
+		}
+	}
+	if !setReturn {
+		after := options.After
+		opts = append(opts, &options.FindOneAndUpdateOptions{ReturnDocument: &after})
+	}
+	um := utils.Struct2Map(update)
+	um["updatedAt"] = time.Now()
+	set := bson.M{
+		"$set": um,
+	}
+	result := b.collection().FindOneAndUpdate(ctx, query, set, opts...)
+	err := result.Decode(bind)
+	return err
+}
+
+func (b *MongoTool) FindMOneAndUpdateInc(ctx context.Context, bind interface{}, query bson.M, update interface{}, inc interface{}, opts ...*options.FindOneAndUpdateOptions) error {
+	um := utils.Struct2Map(update)
+	um["updatedAt"] = time.Now()
+	im := utils.Struct2Map(inc)
+	set := bson.M{
+		"$set": um,
+	}
+	if im != nil {
+		set["$inc"] = inc
+	}
+
+	setReturn := false
+	for _, opt := range opts {
+		if opt != nil && opt.ReturnDocument != nil {
+			setReturn = true
+			break
+		}
+	}
+	if !setReturn {
+		after := options.After
+		opts = append(opts, &options.FindOneAndUpdateOptions{ReturnDocument: &after})
+	}
+
+	result := b.collection().FindOneAndUpdate(ctx, query, set, opts...)
+	err := result.Decode(bind)
+	return err
+}
+
+func (b *MongoTool) FindOneAndUpdateTiny(
+	ctx context.Context,
+	query bson.M,
+	update bson.M,
+	opts ...*options.FindOneAndUpdateOptions) error {
+	result := b.collection().FindOneAndUpdate(ctx, query, update, opts...)
+	return result.Err()
+}
+
+func (b *MongoTool) FindOneAndUpdateReturnTiny(ctx context.Context,
+	bind interface{},
+	query bson.M,
+	update bson.M,
+	afterDoc bool,
+	opts ...*options.FindOneAndUpdateOptions) error {
+
+	if afterDoc {
+		opts = append(opts, options.FindOneAndUpdate().SetReturnDocument(options.After))
+	} else {
+		opts = append(opts, options.FindOneAndUpdate().SetReturnDocument(options.Before))
+	}
+
+	result := b.collection().FindOneAndUpdate(ctx, query, update, opts...).Decode(bind)
+	return result
+}
+
+func (b *MongoTool) FindOneAndUpdate(ctx context.Context, bind interface{}, query bson.M, update bson.M, opts ...*options.FindOneAndUpdateOptions) error {
+	setReturn := false
+	for _, opt := range opts {
+		if opt != nil && opt.ReturnDocument != nil {
+			setReturn = true
+			break
+		}
+	}
+	if !setReturn {
+		after := options.After
+		opts = append(opts, &options.FindOneAndUpdateOptions{ReturnDocument: &after})
+	}
+	b.setUpdatedAt(update, time.Now())
+	result := b.collection().FindOneAndUpdate(ctx, query, update, opts...)
+	err := result.Decode(bind)
+	return err
+}
+
+func (b *MongoTool) Find(ctx context.Context, bind interface{}, query bson.M, opt ...*options.FindOptions) error {
+	err := b.validSlice(bind)
+	cur, err := b.collection().Find(ctx, query, opt...)
+	if err != nil && err == mongo.ErrNoDocuments {
+		return nil
+	} else if err != nil {
+		return err
+	}
+	err = cur.All(ctx, bind)
+	return err
+}
+
+func (b *MongoTool) FindByPage(ctx context.Context, bind interface{}, query bson.M, pageAndSort *PageAndSort, opts ...*options.FindOptions) error {
+	err := b.validSlice(bind)
+	if err != nil {
+		return err
+	}
+	opt := &options.FindOptions{}
+	if pageAndSort == nil {
+		return errors.New("page must not nil")
+	}
+	if pageAndSort.Page == 0 || pageAndSort.PageSize == 0 {
+		return errors.New("page and  PageSize must not nil")
+	}
+	skip := (pageAndSort.Page - 1) * pageAndSort.PageSize
+	opt.Skip = &skip
+	opt.Limit = &pageAndSort.PageSize
+	if pageAndSort.Sort != nil {
+		opt.Sort = pageAndSort.Sort
+	}
+	opts = append(opts, opt)
+	cur, err := b.collection().Find(ctx, query, opts...)
+	if err != nil && err == mongo.ErrNoDocuments {
+		return nil
+	} else if err != nil {
+		return err
+	}
+	err = cur.All(ctx, bind)
+	return err
+
+}
+
+func (b *MongoTool) FindOneAndDelete(ctx context.Context, bind interface{}, query bson.M, opts ...*options.FindOneAndDeleteOptions) error {
+	result := b.collection().FindOneAndDelete(ctx, query, opts...)
+	if result.Err() != nil {
+		return result.Err()
+	}
+	return result.Decode(bind)
+}
+
+func (b *MongoTool) InsertOneTiny(ctx context.Context, doc interface{}) (err error) {
+	_, err = b.collection().InsertOne(ctx, doc)
+	return
+}
+
+func (b *MongoTool) InsertOne(ctx context.Context, doc interface{}) (string, error) {
+	//设置创建时间
+	b.addCreatedAt(doc)
+	//设置修改时间
+	b.addUpdatedAt(doc)
+	result, err := b.collection().InsertOne(ctx, doc)
+	if err != nil {
+		return "", err
+	}
+	if id, ok := result.InsertedID.(primitive.ObjectID); ok {
+		return id.Hex(), nil
+	}
+	return "", err
+}
+
+func (b *MongoTool) InsertMany(ctx context.Context, docs interface{}) ([]interface{}, error) {
+	err := b.validSlice(docs)
+	if err != nil {
+		return nil, err
+	}
+	res := b.setTimeForSlice(docs)
+	result, err := b.collection().InsertMany(ctx, res)
+	if err != nil {
+		return nil, err
+	}
+	return result.InsertedIDs, err
+}
+
+// struct方式
+func (b *MongoTool) UpdateMOne(ctx context.Context, query bson.M, update interface{}) (*mongo.UpdateResult, error) {
+	um := utils.Struct2Map(update)
+	um["updatedAt"] = time.Now()
+	set := bson.M{
+		"$set": um,
+	}
+	return b.collection().UpdateOne(ctx, query, set)
+}
+
+func (b *MongoTool) UpdateMOneInc(ctx context.Context, query bson.M, update interface{}, inc interface{}) (*mongo.UpdateResult, error) {
+	um := utils.Struct2Map(update)
+	um["updatedAt"] = time.Now()
+	set := bson.M{
+		"$set": um,
+	}
+	im := utils.Struct2Map(inc)
+	if im != nil {
+		set["$inc"] = im
+	}
+	return b.collection().UpdateOne(ctx, query, set)
+}
+
+// 原生bson.M 方式
+func (b *MongoTool) UpdateOne(ctx context.Context, query bson.M, update bson.M) (*mongo.UpdateResult, error) {
+	b.setUpdatedAt(update, time.Now())
+	return b.collection().UpdateOne(ctx, query, update)
+}
+
+// struct方式
+func (b *MongoTool) UpsertMOne(ctx context.Context, query bson.M, update interface{}) (*mongo.UpdateResult, error) {
+	um := utils.Struct2Map(update)
+	um["updatedAt"] = time.Now()
+	set := bson.M{
+		"$set": um,
+	}
+	upsert := true
+	opt := &options.UpdateOptions{
+		Upsert: &upsert,
+	}
+	now := time.Now()
+	result, err := b.collection().UpdateOne(ctx, query, set, opt)
+	if err == nil {
+		if result.UpsertedCount >= 1 {
+			_, err = b.collection().UpdateOne(ctx, query, bson.M{"$set": bson.M{"createdAt": now}})
+		}
+	}
+	return result, err
+
+}
+
+func (b *MongoTool) UpsertOneEx(ctx context.Context, query bson.M, update bson.M) (*mongo.UpdateResult, error) {
+	opt := &options.UpdateOptions{}
+	opt.SetUpsert(true)
+	result, err := b.collection().UpdateOne(ctx, query, update, opt)
+	return result, err
+
+}
+
+func (b *MongoTool) UpsertOne(ctx context.Context, query bson.M, update bson.M) (*mongo.UpdateResult, error) {
+
+	upsert := true
+	opt := &options.UpdateOptions{
+		Upsert: &upsert,
+	}
+	now := time.Now()
+	b.setUpdatedAt(update, now)
+	result, err := b.collection().UpdateOne(ctx, query, update, opt)
+	if err == nil {
+		if result.UpsertedCount >= 1 {
+			_, err = b.collection().UpdateOne(ctx, query, bson.M{"$set": bson.M{"createdAt": now}})
+		}
+	}
+	return result, err
+
+}
+
+func (b *MongoTool) UpdateMMany(ctx context.Context, query bson.M, update interface{}) (*mongo.UpdateResult, error) {
+	//b.setUpdatedAt(update, time.Now())
+	return b.collection().UpdateMany(ctx, query, update)
+}
+
+func (b *MongoTool) UpdateMany(ctx context.Context, query bson.M, update bson.M) (*mongo.UpdateResult, error) {
+	b.setUpdatedAt(update, time.Now())
+	return b.collection().UpdateMany(ctx, query, update)
+}
+
+func (b *MongoTool) DeleteById(ctx context.Context, id interface{}) (int64, error) {
+
+	param := bson.M{"_id": id}
+	result, err := b.collection().DeleteOne(ctx, param)
+	if err != nil {
+		return 0, err
+	}
+	return result.DeletedCount, nil
+
+}
+
+func (b *MongoTool) DeleteOne(ctx context.Context, query bson.M, opts ...*options.DeleteOptions) (int64, error) {
+
+	result, err := b.collection().DeleteOne(ctx, query)
+	if err != nil {
+		return 0, err
+	}
+	return result.DeletedCount, nil
+}
+
+func (b *MongoTool) DeleteMany(ctx context.Context, query bson.M, opts ...*options.DeleteOptions) (int64, error) {
+
+	result, err := b.collection().DeleteMany(ctx, query, opts...)
+	if err != nil {
+		return 0, err
+	}
+	deletedCount := result.DeletedCount
+	return deletedCount, nil
+}
+
+func (b *MongoTool) Aggregate(ctx context.Context, bind interface{}, pipeline []bson.M, opts ...*options.AggregateOptions) error {
+
+	err := b.validSlice(bind)
+	if err != nil {
+		return err
+	}
+	cur, err := b.collection().Aggregate(ctx, pipeline, opts...)
+	if err != nil {
+		return err
+	}
+	return cur.All(ctx, bind)
+}
+
+func (b *MongoTool) ObjectAggregate(ctx context.Context, bind interface{}, pipeline []bson.M, opts ...*options.AggregateOptions) error {
+	cur, err := b.collection().Aggregate(ctx, pipeline, opts...)
+	if err != nil {
+		return err
+	}
+	if cur.Next(ctx) {
+		return cur.Decode(bind)
+	}
+	return nil
+}
+
+func (b *MongoTool) QueryOne(ctx context.Context, bind interface{}, query interface{}, opts ...*options.FindOneOptions) error {
+	err := b.collection().FindOne(ctx, query, opts...).Decode(bind)
+	if err != nil && err == mongo.ErrNoDocuments {
+		return nil
+	}
+	return err
+}
+
+func (b *MongoTool) Count(ctx context.Context, query interface{}, opts ...*options.CountOptions) (int64, error) {
+	return b.collection().CountDocuments(ctx, query, opts...)
+}
+
+func (b *MongoTool) EstimatedCount(ctx context.Context, opts ...*options.EstimatedDocumentCountOptions) (int64, error) {
+	return b.collection().EstimatedDocumentCount(ctx, opts...)
+}
+
+func (b *MongoTool) BulkWrite(ctx context.Context, models []mongo.WriteModel, opts ...*options.BulkWriteOptions) (*mongo.BulkWriteResult, error) {
+	return b.collection().BulkWrite(ctx, models, opts...)
+}
+
+// CreateIndex 创建数据索引.options 在index里面创建
+func (b *MongoTool) CreateIndex(ctx context.Context, models []mongo.IndexModel) ([]string, error) {
+	data, err := b.collection().Indexes().CreateMany(ctx, models)
+	if err != nil {
+		if strings.Contains(err.Error(), "IndexKeySpecsConflict") {
+			return data, nil
+		}
+		if strings.Contains(err.Error(), "IndexOptionsConflict") {
+			return data, nil
+		}
+		return data, err
+	}
+	return data, nil
+}
+
+// DropIndex 删除数据索引.options 在index里面创建
+func (b *MongoTool) DropIndex(ctx context.Context, indexName string) error {
+	_, err := b.collection().Indexes().DropOne(ctx, indexName)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (b *MongoTool) addCreatedAt(val interface{}) {
+	if _, ok := val.(bson.M); ok {
+		return
+	}
+	if _, ok := val.(map[string]interface{}); ok {
+		return
+	}
+	v := reflect.ValueOf(val).Elem().FieldByName("CreatedAt")
+	if v.IsValid() {
+		v.Set(reflect.ValueOf(time.Now()))
+	}
+
+}
+func (b *MongoTool) addUpdatedAt(val interface{}) {
+	if _, ok := val.(bson.M); ok {
+		return
+	}
+	if _, ok := val.(map[string]interface{}); ok {
+		return
+	}
+	v := reflect.ValueOf(val).Elem().FieldByName("UpdatedAt")
+	if v.IsValid() {
+		v.Set(reflect.ValueOf(time.Now()))
+	}
+}
+
+func (b *MongoTool) setTimeForSlice(docs interface{}) []interface{} {
+	arr := reflect.ValueOf(docs).Elem()
+	result := make([]interface{}, 0)
+	for i := 0; i < arr.Len(); i++ {
+		ele := arr.Index(i).Elem()
+		now := time.Now()
+		if ma := ele.FieldByName("UpdatedAt"); ma.IsValid() {
+			ma.Set(reflect.ValueOf(now))
+		}
+		if ca := ele.FieldByName("CreatedAt"); ca.IsValid() {
+			ca.Set(reflect.ValueOf(now))
+		}
+		result = append(result, ele.Interface())
+	}
+	return result
+}
+func (b *MongoTool) validSlice(bind interface{}) error {
+
+	if reflect.TypeOf(bind).Kind() != reflect.Ptr {
+		return errors.New("interface must be a  Ptr")
+	}
+	if reflect.TypeOf(bind).Elem().Kind() != reflect.Slice {
+		return errors.New("interface must be a  slice")
+	}
+	return nil
+}
+
+func (b *MongoTool) setUpdatedAt(doc bson.M, now time.Time) {
+	set, exists := doc["$set"]
+	if !exists {
+		doc["$set"] = bson.M{"updatedAt": now}
+		return
+	}
+
+	if res, ok := set.(bson.M); ok {
+		res["updatedAt"] = now
+	}
+}
+
+func (b *MongoTool) setCreatedAt(doc bson.M, now time.Time) {
+	set, exists := doc["$set"]
+	if !exists {
+		doc["$set"] = bson.M{"createdAt": now}
+		return
+	}
+	if res, ok := set.(bson.M); ok {
+		res["createdAt"] = now
+	}
+
+}
+
+// Exists 是否存在数据
+func (b *MongoTool) Exists(ctx context.Context, filter interface{}, opts ...*options.FindOneOptions) (bool, error) {
+	var limit int64 = 1
+	lo := &options.CountOptions{Limit: &limit}
+	n, err := b.Count(ctx, filter, lo)
+	if err != nil {
+		return false, err
+	}
+	return n > 0, nil
+}

common/mongos/codec.go

@@ -0,0 +1,119 @@
+package mongos
+
+import (
+	"fmt"
+	"github.com/shopspring/decimal"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/bson/bsonrw"
+	"go.mongodb.org/mongo-driver/bson/bsontype"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"reflect"
+	"time"
+)
+
+var Registry = func() *bsoncodec.Registry {
+	builder := bson.NewRegistryBuilder()
+	builder.RegisterDecoder(reflect.TypeOf(time.Time{}), &localTimeDecoder{})
+	builder.RegisterDecoder(reflect.TypeOf(decimal.Decimal{}), &decimalDecoder{})
+	builder.RegisterEncoder(reflect.TypeOf(decimal.Decimal{}), &decimalEncoder{})
+	builder.RegisterDefaultDecoder(reflect.Float32, &floatDecoder{})
+	builder.RegisterDefaultDecoder(reflect.Float64, &floatDecoder{})
+	return builder.Build()
+}()
+
+type floatDecoder struct {
+}
+
+func (dvd *floatDecoder) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	var f float64
+	var err error
+	switch vr.Type() {
+	case bsontype.Int32:
+		i32, err := vr.ReadInt32()
+		if err != nil {
+			return err
+		}
+		f = float64(i32)
+	case bsontype.Int64:
+		i64, err := vr.ReadInt64()
+		if err != nil {
+			return err
+		}
+		f = float64(i64)
+	case bsontype.Double:
+		f, err = vr.ReadDouble()
+		if err != nil {
+			return err
+		}
+	default:
+		return fmt.Errorf("cannot decode %v into a float32 or float64 type", vr.Type())
+	}
+	val.SetFloat(f)
+	return nil
+}
+
+type localTimeDecoder struct{}
+
+func (*localTimeDecoder) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	dvd := bsoncodec.DefaultValueDecoders{}
+	err := dvd.TimeDecodeValue(dc, vr, val)
+	if err != nil {
+		return err
+	}
+	t := val.Interface().(time.Time)
+	val.Set(reflect.ValueOf(t.Local()))
+	return nil
+}
+
+type decimalDecoder struct{}
+
+func (*decimalDecoder) DecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != reflect.TypeOf(decimal.Decimal{}) {
+		return bsoncodec.ValueDecoderError{Name: "DecimalDecodeValue", Types: []reflect.Type{reflect.TypeOf(decimal.Decimal{})}, Received: val}
+	}
+	var (
+		num bool
+	)
+	if vr.Type() == bson.TypeInt32 || vr.Type() == bson.TypeInt64 {
+		vr.ReadInt32()
+		vr.ReadInt64()
+		num = true
+	}
+	if num {
+		d := decimal.NewFromFloat(0.0)
+		val.Set(reflect.ValueOf(d))
+		return nil
+	}
+
+	mongodecimal, err := vr.ReadDecimal128()
+	if err != nil {
+		return err
+	}
+	d, err := decimal.NewFromString(mongodecimal.String())
+	if err != nil {
+		return err
+	}
+	val.Set(reflect.ValueOf(d))
+	return nil
+}
+
+//
+
+type decimalEncoder struct{}
+
+func (*decimalEncoder) EncodeValue(ctx bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
+	if !val.IsValid() || val.Type() != reflect.TypeOf(decimal.Decimal{}) {
+		return bsoncodec.ValueDecoderError{Name: "DecimalEncodeValue", Types: []reflect.Type{reflect.TypeOf(decimal.Decimal{})}, Received: val}
+	}
+
+	if d, ok := val.Interface().(decimal.Decimal); ok {
+		mongodecimal, err := primitive.ParseDecimal128(d.StringFixed(2))
+		if err != nil {
+			return err
+		}
+		val = reflect.ValueOf(mongodecimal)
+	}
+	dve := bsoncodec.DefaultValueEncoders{}
+	return dve.Decimal128EncodeValue(ctx, vw, val)
+}

common/mongos/manager.go

@@ -0,0 +1,138 @@
+package mongos
+
+import (
+	"context"
+	"stat/common/log"
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/x/mongo/driver/connstring"
+
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+var MgoManager *Manager
+
+type Options struct {
+	Url string `json:"url"` // 数据库连接
+}
+
+// Manager 数据库连接管理器
+// 重置连接等
+type Manager struct {
+	client *mongo.Client
+	url    string
+	db     string
+}
+
+func NewManager(url string) *Manager {
+	return &Manager{url: url}
+}
+
+func (m *Manager) Database() *mongo.Database {
+	return m.client.Database(m.db)
+}
+
+func (m *Manager) Connect() error {
+	cs, err := connstring.Parse(m.url)
+	if err != nil {
+		log.Error("db connect parse err", log.E(err))
+		return err
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	client, err := mongo.Connect(ctx, options.Client().ApplyURI(m.url))
+	if err != nil {
+		log.Error("[warn] connect mongo db err", log.E(err))
+		return err
+	}
+	if err = client.Ping(ctx, nil); err != nil {
+		log.Error("[warn] ping mongo db err", log.E(err))
+		return err
+	}
+
+	m.db = cs.Database
+	m.client = client
+
+	log.Info("mongos:Init ok!", log.Any("dbName", m.db), log.Any("dbHost", cs.Hosts))
+	return nil
+}
+
+func (m *Manager) DisConnect() {
+	if m.client != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if err := m.client.Disconnect(ctx); err != nil {
+			log.Error("db disconnect err", log.E(err))
+		}
+		m.client = nil
+	}
+}
+
+//Transaction 开启事务处理包裹处理,里面处理的全是利用的事务的ctx
+func (m *Manager) Transaction(ctx context.Context, fn func(sctx mongo.SessionContext) error) error {
+	return m.client.UseSession(
+		ctx,
+		func(sctx mongo.SessionContext) error {
+			return runTransactionWithRetry(sctx, func(ctx mongo.SessionContext) error {
+				err := sctx.StartTransaction()
+				if err != nil {
+					return err
+				}
+				err = fn(sctx)
+				if err != nil {
+					sctx.AbortTransaction(sctx)
+					return err
+				}
+				return commitWithRetry(sctx)
+			})
+		},
+	)
+}
+
+func runTransactionWithRetry(sctx mongo.SessionContext, txnFn func(mongo.SessionContext) error) error {
+	for {
+		err := txnFn(sctx) // Performs transaction.
+		if err == nil {
+			return nil
+		}
+		// If transient error, retry the whole transaction
+		if cmdErr, ok := err.(mongo.CommandError); ok && cmdErr.HasErrorLabel("TransientTransactionError") {
+			continue
+		}
+		return err
+	}
+}
+
+// commitWithRetry is an example function demonstrating transaction retry logic.
+func commitWithRetry(sctx mongo.SessionContext) error {
+	for {
+		err := sctx.CommitTransaction(sctx)
+		switch e := err.(type) {
+		case nil:
+			return nil
+		case mongo.CommandError:
+			// Can retry commit
+			if e.HasErrorLabel("UnknownTransactionCommitResult") {
+				continue
+			}
+			return e
+		default:
+			return e
+		}
+	}
+}
+
+func Transaction(ctx context.Context, fn func(sctx mongo.SessionContext) error) error {
+	return MgoManager.Transaction(ctx, fn)
+}
+
+func ToBsonM(v interface{}) bson.M {
+	b, _ := bson.Marshal(v)
+	var r = bson.M{}
+	_ = bson.Unmarshal(b, &r)
+	return r
+}