Failed to connect MongoDB by native db driver - mongodb

Question

I am trying to connect MongoDB by the native MongoDB driver with go language
(ref).
Here is my snapcode.
package main
import (
"context"
"fmt"
"log"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
const (
account = "rootAdmin"
password = "12345678"
iP = "127.0.0.1"
port = 27017
tlsCertificateKeyFile = "D:/cert/wa.pem"
)
type mongoStuff struct {
ctx context.Context
client *mongo.Client
cancel context.CancelFunc
}
func connectToMongoDB() *mongoStuff {
uri := fmt.Sprintf("mongodb://%v:%v#%v:%v/?authSource=admin&tlsCertificateKeyFile=%v&tls=true",
account,
password,
iP,
port,
tlsCertificateKeyFile)
credential := options.Credential{
AuthMechanism: "MONGODB-X509",
Username: account,
Password: password,
}
log.Println(uri)
clientOpts := options.Client().ApplyURI(uri).SetAuth(credential)
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
client, err := mongo.Connect(ctx, clientOpts)
if err != nil {
log.Println("Dead connect")
log.Fatal(err)
}
return &mongoStuff{ctx, client, cancel}
}
func disconnectMongoDB(mongodb *mongoStuff) {
cancel := mongodb.cancel
client := mongodb.client
ctx := mongodb.ctx
defer cancel()
defer func() {
if err := client.Disconnect(ctx); err != nil {
log.Println("Dead disconnect")
panic(err)
}
}()
}
func insertExamples(mongodb *mongoStuff) {
ctx := mongodb.ctx
var db *mongo.Database = mongodb.client.Database("documentation_examples")
coll := db.Collection("inventory_insert")
err := coll.Drop(ctx)
if err != nil {
log.Println("Dead drop")
log.Fatal(err)
}
{
result, err := coll.InsertOne(
ctx,
bson.D{
{"item", "canvas"},
{"qty", 100},
{"tags", bson.A{"cotton"}},
{
"size", bson.D{
{"h", 28},
{"w", 35.5},
{"uom", "cm"},
}},
})
if err != nil {
log.Println("Dead insertone")
log.Fatal(err)
}
log.Printf("insertone success. id=%v", result.InsertedID)
}
}
func main() {
mongodb := connectToMongoDB()
defer disconnectMongoDB(mongodb)
insertExamples(mongodb)
}
Whenever I run the code, it just comes up with the below error.
connection() error occured during connection handshake: auth error: round trip error: (AuthenticationFailed) No user name provided
I can't figure out what's going on.

Answer 1

To authenticate with x.509, the username should be either the common name of the certificate or empty. You seem to be attempting some mix of password and x.509 authentication.
All required options can be provided in the URI. See How can I connect with X509 by putting all options in the connection string in node.js driver for mongodb?.
If you insist on specifying credentials not in a URI, reference driver documentation that describes how to do that for x509 credentials.