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mongo_sequencer.go
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mongo_sequencer.go
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// 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 mongo
import (
"context"
"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"
"go.mongodb.org/mongo-driver/mongo/writeconcern"
"mosn.io/pkg/log"
"mosn.io/layotto/components/pkg/utils"
"mosn.io/layotto/components/sequencer"
)
type MongoSequencer struct {
factory utils.MongoFactory
client utils.MongoClient
session utils.MongoSession
collection utils.MongoCollection
singResult utils.MongoSingleResult
metadata utils.MongoMetadata
biggerThan map[string]int64
logger log.ErrorLogger
ctx context.Context
cancel context.CancelFunc
}
type SequencerDocument struct {
Id string `bson:"_id"`
Sequencer_value int64 `bson:"sequencer_value"`
}
// MongoSequencer returns a new mongo sequencer
func NewMongoSequencer(logger log.ErrorLogger) *MongoSequencer {
m := &MongoSequencer{
logger: logger,
}
return m
}
func (e *MongoSequencer) Init(config sequencer.Configuration) error {
var document SequencerDocument
// 1.parse config
m, err := utils.ParseMongoMetadata(config.Properties)
if err != nil {
return err
}
e.metadata = m
e.biggerThan = config.BiggerThan
e.factory = &utils.MongoFactoryImpl{}
// 2. construct client
e.ctx, e.cancel = context.WithCancel(context.Background())
if e.client, err = e.factory.NewMongoClient(m); err != nil {
return err
}
if err := e.client.Ping(e.ctx, nil); err != nil {
return err
}
// Connections Collection
e.collection, err = utils.SetCollection(e.client, e.factory, e.metadata)
if err != nil {
return err
}
if len(e.biggerThan) > 0 {
for k, bt := range e.biggerThan {
if bt <= 0 {
continue
}
// find key of biggerThan
cursor, err := e.collection.Find(e.ctx, bson.M{"_id": k})
if err != nil {
return err
}
if cursor != nil && cursor.RemainingBatchLength() > 0 {
cursor.Decode(&document)
}
// check biggerThan's value
if document.Sequencer_value < bt {
return fmt.Errorf("mongo sequencer error: can not satisfy biggerThan guarantee.key: %s,current id:%v", k, document.Sequencer_value)
}
}
}
return err
}
func (e *MongoSequencer) GetNextId(req *sequencer.GetNextIdRequest) (*sequencer.GetNextIdResponse, error) {
var err error
var document SequencerDocument
// create mongo session
e.session, err = e.client.StartSession()
txnOpts := options.Transaction().SetReadConcern(readconcern.Snapshot()).
SetWriteConcern(writeconcern.New(writeconcern.WMajority()))
// check session
if err != nil {
return nil, fmt.Errorf("[mongoSequencer]: Create Session return error: %s key: %s", err, req.Key)
}
// close mongo session
defer e.session.EndSession(e.ctx)
status, err := e.session.WithTransaction(e.ctx, func(sessionContext mongo.SessionContext) (interface{}, error) {
var err error
after := options.After
upsert := true
opt := options.FindOneAndUpdateOptions{
ReturnDocument: &after,
Upsert: &upsert,
}
e.singResult = e.factory.NewSingleResult(e.collection.FindOneAndUpdate(e.ctx, bson.M{"_id": req.Key}, bson.M{"$inc": bson.M{"sequencer_value": 1}}, &opt))
// rollback
if e.singResult.Err() != nil {
_ = sessionContext.AbortTransaction(sessionContext)
return nil, err
}
// commit
if err = sessionContext.CommitTransaction(sessionContext); err != nil {
return nil, err
}
e.singResult.Decode(&document)
return document, nil
}, txnOpts)
if err != nil || status == nil {
return nil, err
}
return &sequencer.GetNextIdResponse{
NextId: document.Sequencer_value,
}, nil
}
func (e *MongoSequencer) GetSegment(req *sequencer.GetSegmentRequest) (support bool, result *sequencer.GetSegmentResponse, err error) {
var document SequencerDocument
// size=0 only check support
if req.Size == 0 {
return true, nil, nil
}
// create mongo session
e.session, err = e.client.StartSession()
txnOpts := options.Transaction().SetReadConcern(readconcern.Snapshot()).
SetWriteConcern(writeconcern.New(writeconcern.WMajority()))
// check session
if err != nil {
return true, nil, fmt.Errorf("[mongoSequencer]: Create Session return error: %s key: %s", err, req.Key)
}
// close mongo session
defer e.session.EndSession(e.ctx)
status, err := e.session.WithTransaction(e.ctx, func(sessionContext mongo.SessionContext) (interface{}, error) {
var err error
after := options.After
upsert := true
opt := options.FindOneAndUpdateOptions{
ReturnDocument: &after,
Upsert: &upsert,
}
// find and upsert
e.singResult = e.factory.NewSingleResult(e.collection.FindOneAndUpdate(e.ctx, bson.M{"_id": req.Key}, bson.M{"$inc": bson.M{"sequencer_value": req.Size}}, &opt))
// rollback
if e.singResult.Err() != nil {
_ = sessionContext.AbortTransaction(sessionContext)
return nil, err
}
// commit
if err = sessionContext.CommitTransaction(sessionContext); err != nil {
return nil, err
}
e.singResult.Decode(&document)
return document, nil
}, txnOpts)
if err != nil || status == nil {
return true, nil, err
}
return true, &sequencer.GetSegmentResponse{
From: document.Sequencer_value - int64(req.Size) + 1,
To: document.Sequencer_value,
}, nil
}
func (e *MongoSequencer) Close() error {
e.cancel()
return e.client.Disconnect(e.ctx)
}