So I am trying to use https://github.com/mongodb/mongo-go-driver to connect to a mongo database in golang.
Here is my connection handler:
var DB *mongo.Database
func CreateConnectionHandler()(*mongo.Database, error){
fmt.Println("inside createConnection in database package")
godotenv.Load()
fmt.Println("in CreateConnectionHandler and SERVER_CONFIG: ")
fmt.Println(os.Getenv("SERVER_CONFIG"))
uri:=""
if os.Getenv("SERVER_CONFIG")=="kubernetes"{
fmt.Println("inside kubernetes db config")
uri = "mongodb://patientplatypus:SUPERSECRETPASSDOOT@
mongo-release-mongodb.default.svc.cluster.local:27017/
platypusNEST?authMechanism=SCRAM-SHA-1"
}else if os.Getenv("SERVER_CONFIG")=="compose"{
fmt.Println("inside compose db config")
uri = "mongodb://datastore:27017"
}
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
client, err := mongo.Connect(ctx, uri)
if err != nil {
return nil, fmt.Errorf("mongo client couldn't connect: %v", err)
}
DB := client.Database("platypusNEST")
return DB, nil
}
And the error I am getting:
api | database/connection.go:29:30: cannot use uri (type
string) as type *options.ClientOptions in argument to mongo.Connect
So I tried replacing uri with the connection string like this:
client, err := mongo.Connect(ctx, "mongodb://datastore:27017")
But I still got the error.
Compare this with what is in the documentation:
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second) client, err := mongo.Connect(ctx, "mongodb://localhost:27017")
And it is exactly the same! I'm really not sure why there is this error. Any ideas?
To those who come searching - the docs are out of date as of this posting, but their latest push here: https://github.com/mongodb/mongo-go-driver/commit/32946b1f8b9412a6a94e68ff789575327bb257cf has them doing this with the connect:
client, err := mongo.NewClient(options.Client().ApplyURI(uri))
You will also now need to import the options package. Happy hacking.
EDIT: thanks vcanales for finding this - you're a gentleman and a scholar.
In addition to the accepted answer - this snippet below may be improved by using an environment variable to pass in the Mongodb URL.
package main
import (
"context
"fmt"
"time"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"go.mongodb.org/mongo-driver/mongo/readpref"
)
func ConnectMongo() {
var (
client *mongo.Client
mongoURL = "mongodb://localhost:27017"
)
// Initialize a new mongo client with options
client, err := mongo.NewClient(options.Client().ApplyURI(mongoURL))
// Connect the mongo client to the MongoDB server
ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
err = client.Connect(ctx)
// Ping MongoDB
ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
if err = client.Ping(ctx, readpref.Primary()); err != nil {
fmt.Println("could not ping to mongo db service: %v
", err)
return
}
fmt.Println("connected to nosql database:", mongoURL)
}
func main() {
ConnectMongo()
}
More information on options and readpref respectively: https://docs.mongodb.com/manual/reference/method/cursor.readPref/index.html https://docs.mongodb.com/manual/core/read-preference/