How to Successfully Connect to MongoDB Atlas using Golang Drivers with the New URL Syntax?

Using Golang Drivers to Connect to MongoDB Atlas with New URL Syntax

While connecting to MongoDB Atlas using Golang drivers, issues may arise due to the use of the new URL syntax introduced in MongoDB 3.6. This article explores the potential pitfalls and provides solutions.

Error: Not Getting Connected

The code presented attempts to establish a connection using the tls.Dial("tcp", addr.String(), tlsConfig) function. However, it does not specify a timeout, which can result in the code blocking indefinitely. To resolve this, explicitly set the timeout using dialInfo.Timeout = time.Duration(30).

Error: No Reachable Servers

When using the mgo.DialWithInfo function with the SCRAM mechanism, an error may occur indicating that no reachable servers were found. This is because the globalsign/mgo driver does not currently support the SRV connection string URI. Alternatively, use the non-SRV connection URI format (MongoDB v3.4) or consider using the mongo-go-driver instead, which does support the SRV connection URI.

Sample Code Using Mongo-go-driver

To demonstrate connecting using the mongo-go-driver with the SRV connection URI, consider the following code snippet:

mongoURI := "mongodb+srv://admin:[email protected]/dbname?ssl=true&retryWrites=true"

client, err := mongo.NewClient(options.Client().ApplyURI(mongoURI))
if err != nil {
    log.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
err = client.Connect(ctx)
defer client.Disconnect(ctx)

if err != nil {
    log.Fatal(err)
}

This example is compatible with the current version of mongo-go-driver, v1.0.0.

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