add sequencer of mongo

cmd/layotto/main.go

@@ -106,6 +106,7 @@ import (
 
 	// Sequencer
 	sequencer_etcd "mosn.io/layotto/components/sequencer/etcd"
+	sequencer_mongo "mosn.io/layotto/components/sequencer/mongo"
 	sequencer_redis "mosn.io/layotto/components/sequencer/redis"
 	sequencer_zookeeper "mosn.io/layotto/components/sequencer/zookeeper"
 
@@ -334,6 +335,9 @@ func NewRuntimeGrpcServer(data json.RawMessage, opts ...grpc.ServerOption) (mgrp
 			runtime_sequencer.NewFactory("zookeeper", func() sequencer.Store {
 				return sequencer_zookeeper.NewZookeeperSequencer(log.DefaultLogger)
 			}),
+			runtime_sequencer.NewFactory("mongo", func() sequencer.Store {
+				return sequencer_mongo.NewMongoSequencer(log.DefaultLogger)
+			}),
 		))
 	// 4. check if unhealthy
 	if err != nil {

components/pkg/utils/mongo.go

@@ -17,6 +17,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 	"go.mongodb.org/mongo-driver/mongo/readconcern"
@@ -75,6 +76,7 @@ type Item struct {
 type MongoFactory interface {
 	NewMongoClient(m MongoMetadata) (MongoClient, error)
 	NewMongoCollection(m *mongo.Database, collectionName string, opts *options.CollectionOptions) MongoCollection
+	NewSingleResult(sr *mongo.SingleResult) MongoSingleResult
 }
 
 type MongoClient interface {
@@ -98,10 +100,22 @@ type MongoCollection interface {
 	DeleteOne(ctx context.Context, filter interface{}, opts ...*options.DeleteOptions) (*mongo.DeleteResult, error)
 	Find(ctx context.Context, filter interface{}, opts ...*options.FindOptions) (*mongo.Cursor, error)
 	Indexes() mongo.IndexView
+	UpdateOne(ctx context.Context, filter interface{}, update interface{},
+		opts ...*options.UpdateOptions) (*mongo.UpdateResult, error)
+}
+
+type MongoSingleResult interface {
+	Decode(v interface{}) error
+	Err() error
+	DecodeBytes() (bson.Raw, error)
 }
 
 type MongoFactoryImpl struct{}
 
+func (c *MongoFactoryImpl) NewSingleResult(sr *mongo.SingleResult) MongoSingleResult {
+	return sr
+}
+
 func (c *MongoFactoryImpl) NewMongoCollection(m *mongo.Database, collectionName string, opts *options.CollectionOptions) MongoCollection {
 	collection := m.Collection(collectionName, opts)
 	return collection

components/pkg/utils/mongo_lock_mock.go

@@ -65,6 +65,10 @@ func (f *MockMongoFactory) NewMongoCollection(m *mongo.Database, collectionName
 	return &MockMongoCollection{}
 }
 
+func (f *MockMongoFactory) NewSingleResult(sr *mongo.SingleResult) MongoSingleResult {
+	return nil
+}
+
 func (mc *MockMongoCollection) FindOne(ctx context.Context, filter interface{}, opts ...*options.FindOneOptions) *mongo.SingleResult {
 	result := mongo.SingleResult{}
 	return &result
@@ -105,6 +109,10 @@ func (mc *MockMongoCollection) Indexes() mongo.IndexView {
 	return mongo.IndexView{}
 }
 
+func (mc *MockMongoCollection) UpdateOne(ctx context.Context, filter interface{}, update interface{}, opts ...*options.UpdateOptions) (*mongo.UpdateResult, error) {
+	return nil, nil
+}
+
 func (c *MockMongoClient) StartSession(opts ...*options.SessionOptions) (mongo.Session, error) {
 	return &MockMongoSession{}, nil
 }

components/pkg/utils/mongo_sequencer_mock.go

@@ -0,0 +1,183 @@
+//
+// Copyright 2021 Layotto Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package utils
+
+import (
+	"context"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/bsoncodec"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+	"go.mongodb.org/mongo-driver/mongo/readpref"
+	"reflect"
+	"unsafe"
+)
+
+var Result = make(map[string]bson.M)
+var id string
+
+type MockMongoSequencerFactory struct{}
+
+// MockMongoClient is a mock of MongoClient interface
+type MockMongoSequencerClient struct{}
+
+// MockMongoSession is a mock of MongoSession interface
+type MockMongoSequencerSession struct {
+	mongo.SessionContext
+}
+
+// MockMongoCollection is a mock of MongoCollection interface
+type MockMongoSequencerCollection struct {
+	// '_id' document
+	InsertOneResult *mongo.InsertOneResult
+}
+
+type MockMongoSequencerSingleResult struct{}
+
+func NewMockMongoSequencerFactory() *MockMongoSequencerFactory {
+	return &MockMongoSequencerFactory{}
+}
+
+func NewMockMongoSequencerSession() *MockMongoSequencerSession {
+	return &MockMongoSequencerSession{}
+}
+
+func (f *MockMongoSequencerFactory) NewSingleResult(sr *mongo.SingleResult) MongoSingleResult {
+	return &MockMongoSequencerSingleResult{}
+}
+
+func (f *MockMongoSequencerFactory) NewMongoClient(m MongoMetadata) (MongoClient, error) {
+	return &MockMongoSequencerClient{}, nil
+}
+
+func (f *MockMongoSequencerFactory) NewMongoCollection(m *mongo.Database, collectionName string, opts *options.CollectionOptions) MongoCollection {
+	return &MockMongoSequencerCollection{}
+}
+
+func (mc *MockMongoSequencerCollection) FindOne(ctx context.Context, filter interface{}, opts ...*options.FindOneOptions) *mongo.SingleResult {
+	result := new(mongo.SingleResult)
+	value := reflect.ValueOf(result)
+	doc := filter.(bson.M)
+	id = doc["_id"].(string)
+	if value.Kind() == reflect.Ptr {
+		elem := value.Elem()
+		err := elem.FieldByName("err")
+		*(*error)(unsafe.Pointer(err.Addr().Pointer())) = nil
+
+		cur := elem.FieldByName("cur")
+		*(**mongo.Cursor)(unsafe.Pointer(cur.Addr().Pointer())) = &mongo.Cursor{}
+
+		rdr := elem.FieldByName("rdr")
+		*(*bson.Raw)(unsafe.Pointer(rdr.Addr().Pointer())) = bson.Raw{}
+
+		reg := elem.FieldByName("reg")
+		*(**bsoncodec.Registry)(unsafe.Pointer(reg.Addr().Pointer())) = &bsoncodec.Registry{}
+	}
+	return result
+}
+
+func (mc *MockMongoSequencerCollection) InsertOne(ctx context.Context, document interface{}, opts ...*options.InsertOneOptions) (*mongo.InsertOneResult, error) {
+	doc := document.(bson.M)
+	value := doc["_id"].(string)
+	if _, ok := Result[value]; ok {
+		return nil, nil
+	} else {
+		// insert cache
+		Result[value] = doc
+		mc.InsertOneResult.InsertedID = value
+		return mc.InsertOneResult, nil
+	}
+}
+
+func (mc *MockMongoSequencerCollection) DeleteOne(ctx context.Context, filter interface{}, opts ...*options.DeleteOptions) (*mongo.DeleteResult, error) {
+	return nil, nil
+}
+
+func (mc *MockMongoSequencerCollection) Find(ctx context.Context, filter interface{}, opts ...*options.FindOptions) (*mongo.Cursor, error) {
+	cursor := &mongo.Cursor{}
+	return cursor, nil
+}
+
+func (mc *MockMongoSequencerCollection) Indexes() mongo.IndexView {
+	return mongo.IndexView{}
+}
+
+func (mc *MockMongoSequencerCollection) UpdateOne(ctx context.Context, filter interface{}, update interface{}, opts ...*options.UpdateOptions) (*mongo.UpdateResult, error) {
+	doc := filter.(bson.M)
+	value := doc["_id"].(string)
+	if res, ok := Result[value]; ok {
+		Result[value] = bson.M{"_id": res["_id"], "sequencer_value": res["sequencer_value"].(int) + 1}
+		return nil, nil
+	}
+	return nil, nil
+}
+
+func (c *MockMongoSequencerClient) StartSession(opts ...*options.SessionOptions) (mongo.Session, error) {
+	return &MockMongoSequencerSession{}, nil
+}
+
+func (c *MockMongoSequencerClient) Ping(ctx context.Context, rp *readpref.ReadPref) error {
+	return nil
+}
+
+func (c *MockMongoSequencerClient) Database(name string, opts ...*options.DatabaseOptions) *mongo.Database {
+	return nil
+}
+
+func (c *MockMongoSequencerClient) Disconnect(ctx context.Context) error {
+	return nil
+}
+
+func (s *MockMongoSequencerSession) AbortTransaction(context.Context) error {
+	return nil
+}
+
+func (s *MockMongoSequencerSession) CommitTransaction(context.Context) error {
+	return nil
+}
+
+func (s *MockMongoSequencerSession) WithTransaction(ctx context.Context, fn func(sessCtx mongo.SessionContext) (interface{}, error),
+	opts ...*options.TransactionOptions) (interface{}, error) {
+	res, err := fn(s)
+	return res, err
+}
+
+func (s *MockMongoSequencerSession) EndSession(context.Context) {}
+
+func (d *MockMongoSequencerSingleResult) Decode(v interface{}) error {
+	b := Result[id]
+	id := b["_id"].(string)
+	value := b["sequencer_value"].(int)
+	ref := reflect.ValueOf(v)
+	if ref.Kind() == reflect.Ptr {
+		elem := ref.Elem()
+		Id := elem.FieldByName("Id")
+		*(*string)(unsafe.Pointer(Id.Addr().Pointer())) = id
+
+		v := elem.FieldByName("Sequencer_value")
+		*(*int)(unsafe.Pointer(v.Addr().Pointer())) = value
+	}
+	return nil
+}
+
+func (d *MockMongoSequencerSingleResult) Err() error {
+	if Result[id] == nil {
+		return mongo.ErrNoDocuments
+	}
+	return nil
+}
+
+func (d *MockMongoSequencerSingleResult) DecodeBytes() (bson.Raw, error) {
+	return nil, nil
+}