mongodb

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/jinzhu/copier v0.3.5
 	github.com/jmoiron/sqlx v1.3.5
 	github.com/mattn/go-sqlite3 v1.14.15
-	github.com/stretchr/testify v1.8.0
+	github.com/stretchr/testify v1.8.1
+	go.mongodb.org/mongo-driver v1.10.3
 	go.uber.org/multierr v1.8.0
 )

go.sum

@@ -7,53 +7,95 @@ github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfC
 github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
 github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
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internal/mock/log.go

@@ -1,28 +1,29 @@
 // Package mock implements dependencies for testing.
 //
 //revive:disable:unexported-return
+//revive:disable:exported
 package mock
 
 import (
 	"context"
 )
 
-type log struct {
+type Log struct {
 	Logged []string
 }
 
-// NewLog create mock log.
-func NewLog() *log {
-	return &log{}
+// NewLog create mock Log.
+func NewLog() *Log {
+	return &Log{}
 }
 
-func (l *log) Warning(_ context.Context, msg string) {
+func (l *Log) Warning(_ context.Context, msg string) {
 	l.Logged = append(l.Logged, msg)
 }
 
 type zeroLog struct{}
 
-// NewZeroLog create mock log, which should not be called.
+// NewZeroLog create mock Log, which should not be called.
 func NewZeroLog() *zeroLog {
 	return &zeroLog{}
 }

mongo/factory.go

@@ -0,0 +1,17 @@
+package mongo
+
+import (
+	"context"
+
+	"go.mongodb.org/mongo-driver/mongo"
+
+	"github.com/avito-tech/go-transaction-manager/transaction"
+)
+
+// NewDefaultFactory creates default transaction.Transaction(mongo.Session).
+// TODO add options.
+func NewDefaultFactory(client *mongo.Client) transaction.TrFactory {
+	return func(ctx context.Context, s transaction.Settings) (context.Context, transaction.Transaction, error) {
+		return NewTransaction(ctx, nil, nil, client)
+	}
+}

mongo/transaction.go

@@ -0,0 +1,89 @@
+// Package mongo is an implementation of transaction.Transaction interface by Transaction for mongo.Client.
+package mongo
+
+import (
+	"context"
+	"sync/atomic"
+
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+// Transaction is transaction.Transaction for mongo.Client.
+type Transaction struct {
+	session  mongo.Session
+	isActive int64
+}
+
+// NewTransaction creates transaction.Transaction for mongo.Client.
+func NewTransaction(
+	ctx context.Context,
+	sessionOptions *options.SessionOptions,
+	trOpts *options.TransactionOptions,
+	client *mongo.Client,
+) (context.Context, *Transaction, error) {
+	s, err := client.StartSession(sessionOptions)
+	if err != nil {
+		return ctx, nil, err
+	}
+
+	if err = s.StartTransaction(trOpts); err != nil {
+		return ctx, nil, err
+	}
+
+	tr := &Transaction{session: s, isActive: 1}
+
+	go tr.awaitDone(ctx)
+
+	return mongo.NewSessionContext(ctx, tr.session), tr, nil
+}
+
+func (t *Transaction) awaitDone(ctx context.Context) {
+	if ctx.Done() == nil {
+		return
+	}
+
+	<-ctx.Done()
+
+	t.deactivate()
+}
+
+// Transaction returns the real transaction mongo.Session.
+func (t *Transaction) Transaction() interface{} {
+	return t.session
+}
+
+// Commit the transaction.Transaction.
+func (t *Transaction) Commit(ctx context.Context) error {
+	t.deactivate()
+
+	defer t.session.EndSession(ctx)
+
+	if err := t.session.CommitTransaction(ctx); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Rollback the transaction.Transaction..
+func (t *Transaction) Rollback(ctx context.Context) error {
+	t.deactivate()
+
+	defer t.session.EndSession(ctx)
+
+	if err := t.session.AbortTransaction(ctx); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// IsActive returns true if the transaction started but not committed or rolled back.
+func (t *Transaction) IsActive() bool {
+	return atomic.LoadInt64(&t.isActive) == 1
+}
+
+func (t *Transaction) deactivate() {
+	atomic.SwapInt64(&t.isActive, 0)
+}

mongo/transaction_test.go

@@ -0,0 +1,135 @@
+package mongo
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/integration/mtest"
+
+	"github.com/avito-tech/go-transaction-manager/internal/mock"
+	"github.com/avito-tech/go-transaction-manager/transaction"
+	trmcontext "github.com/avito-tech/go-transaction-manager/transaction/context"
+	"github.com/avito-tech/go-transaction-manager/transaction/manager"
+	"github.com/avito-tech/go-transaction-manager/transaction/settings"
+)
+
+type user struct {
+	ID primitive.ObjectID `bson:"_id,omitempty"`
+}
+
+func TestTransaction(t *testing.T) {
+	t.Parallel()
+
+	type args struct {
+		ctx context.Context
+	}
+
+	testErr := errors.New("error test")
+	doNil := func(mt *mtest.T, ctx context.Context) error {
+		return nil
+	}
+
+	mt := mtest.New(
+		t,
+		mtest.NewOptions().ClientType(mtest.Mock),
+	)
+	defer mt.Close()
+
+	tests := map[string]struct {
+		prepare func(mt *mtest.T)
+		args    args
+		do      func(mt *mtest.T, ctx context.Context) error
+		wantErr assert.ErrorAssertionFunc
+	}{
+		"success": {
+			prepare: func(mt *mtest.T) {},
+			args: args{
+				ctx: context.Background(),
+			},
+			do:      doNil,
+			wantErr: assert.NoError,
+		},
+		"commit_error": {
+			prepare: func(mt *mtest.T) {},
+			args: args{
+				ctx: context.Background(),
+			},
+			do: func(mt *mtest.T, ctx context.Context) error {
+				_, _ = mt.Coll.InsertOne(ctx, user{
+					ID: primitive.NewObjectID(),
+				})
+
+				return nil
+			},
+			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
+				var divErr mongo.CommandError
+
+				return assert.ErrorAs(t, err, &divErr) && assert.ErrorIs(t, err, transaction.ErrCommit)
+			},
+		},
+		"rollback_after_error": {
+			prepare: func(mt *mtest.T) {},
+			args: args{
+				ctx: context.Background(),
+			},
+			do: func(mt *mtest.T, ctx context.Context) error {
+				s := mongo.SessionFromContext(ctx)
+
+				require.NoError(mt, s.AbortTransaction(ctx))
+
+				return testErr
+			},
+			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
+				return assert.ErrorIs(t, err, testErr) &&
+					assert.ErrorIs(t, err, transaction.ErrRollback)
+			},
+		},
+	}
+	for name, tt := range tests {
+		tt := tt
+		mt.Run(name, func(mt *mtest.T) {
+			mt.Parallel()
+
+			log := mock.NewLog()
+
+			tt.prepare(mt)
+
+			s := settings.New(
+				settings.WithPropagation(transaction.PropagationNested),
+			)
+			m := manager.New(
+				NewDefaultFactory(mt.Client),
+				manager.WithLog(log),
+				manager.WithSettings(s),
+			)
+
+			var tr Transaction
+			err := m.Do(tt.args.ctx, func(ctx context.Context) error {
+				var trNested transaction.Transaction
+				err := m.Do(ctx, func(ctx context.Context) error {
+					trNested = trmcontext.DefaultManager.Default(ctx)
+
+					require.NotNil(t, trNested)
+
+					return tt.do(mt, ctx)
+				})
+
+				if trNested != nil {
+					require.Equal(t, true, trNested.IsActive())
+				}
+
+				return err
+			})
+			require.Equal(t, false, tr.IsActive())
+
+			if !tt.wantErr(t, err) {
+				return
+			}
+		})
+	}
+}

sql/factory.go

@@ -7,9 +7,10 @@ import (
 	"github.com/avito-tech/go-transaction-manager/transaction"
 )
 
-// NewDefaultFactory creates default transaction.Transaction(sqlx.Tx).
+// NewDefaultFactory creates default transaction.Transaction(sql.Tx).
+// TODO add options.
 func NewDefaultFactory(db *sql.DB) transaction.TrFactory {
-	return func(ctx context.Context) (transaction.Transaction, error) {
+	return func(ctx context.Context, s transaction.Settings) (context.Context, transaction.Transaction, error) {
 		return NewTransaction(ctx, transaction.NewSavePoint(), nil, db)
 	}
 }