feat: use mongodb official driver instead of mgo (#1782)

* wip: backup

* wip: backup

* wip: backup

* backup

* backup

* backup

* add more tests

* fix wrong dependency

* fix lint errors

* remove test due to data race

* add tests

* fix test error

* add mon.Model

* add mon.Model unmarshal

* add monc

* add more tests for monc

* add more tests for monc

* add docs for mon and monc packages

* fix doc errors

* chhore: add comment

* chore: fix test bug

* chore: refine tests

* chore: remove primitive.NewObjectID in test code

* chore: rename test files for typo

core/stores/mon/bulkinserter.go

@@ -0,0 +1,91 @@
+package mon
+
+import (
+	"context"
+	"time"
+
+	"github.com/zeromicro/go-zero/core/executors"
+	"github.com/zeromicro/go-zero/core/logx"
+	"go.mongodb.org/mongo-driver/mongo"
+)
+
+const (
+	flushInterval = time.Second
+	maxBulkRows   = 1000
+)
+
+type (
+	// ResultHandler is a handler that used to handle results.
+	ResultHandler func(*mongo.InsertManyResult, error)
+
+	// A BulkInserter is used to insert bulk of mongo records.
+	BulkInserter struct {
+		executor *executors.PeriodicalExecutor
+		inserter *dbInserter
+	}
+)
+
+// NewBulkInserter returns a BulkInserter.
+func NewBulkInserter(coll *mongo.Collection, interval ...time.Duration) *BulkInserter {
+	inserter := &dbInserter{
+		collection: coll,
+	}
+
+	duration := flushInterval
+	if len(interval) > 0 {
+		duration = interval[0]
+	}
+
+	return &BulkInserter{
+		executor: executors.NewPeriodicalExecutor(duration, inserter),
+		inserter: inserter,
+	}
+}
+
+// Flush flushes the inserter, writes all pending records.
+func (bi *BulkInserter) Flush() {
+	bi.executor.Flush()
+}
+
+// Insert inserts doc.
+func (bi *BulkInserter) Insert(doc interface{}) {
+	bi.executor.Add(doc)
+}
+
+// SetResultHandler sets the result handler.
+func (bi *BulkInserter) SetResultHandler(handler ResultHandler) {
+	bi.executor.Sync(func() {
+		bi.inserter.resultHandler = handler
+	})
+}
+
+type dbInserter struct {
+	collection    *mongo.Collection
+	documents     []interface{}
+	resultHandler ResultHandler
+}
+
+func (in *dbInserter) AddTask(doc interface{}) bool {
+	in.documents = append(in.documents, doc)
+	return len(in.documents) >= maxBulkRows
+}
+
+func (in *dbInserter) Execute(objs interface{}) {
+	docs := objs.([]interface{})
+	if len(docs) == 0 {
+		return
+	}
+
+	result, err := in.collection.InsertMany(context.Background(), docs)
+	if in.resultHandler != nil {
+		in.resultHandler(result, err)
+	} else if err != nil {
+		logx.Error(err)
+	}
+}
+
+func (in *dbInserter) RemoveAll() interface{} {
+	documents := in.documents
+	in.documents = nil
+	return documents
+}