How to Connect to MongoDB Atlas from Go: Solving Timeout and Server Reachability Issues?

Establishing MongoDB Atlas Connection from Go Using New URL Structure (MongoDB 3.6 )

In your previous attempts to connect to MongoDB Atlas from Go using mgo, you encountered issues with the DialInfo timeout and server reachability. Let's explore these issues and provide solutions:

Zero Timeout

The default DialInfo has a zero timeout, causing the connection establishment process to block indefinitely. To resolve this, you can explicitly set a timeout using:

dialInfo.Timeout = time.Duration(30)
session, err := mgo.DialWithInfo(dialInfo)

Unreachable Servers

Your concern about unreachable servers stems from mgo's lack of support for the SRV connection string URI format (MongoDB v3.4). To address this limitation, you can use the non-srv connection URI format:

mongoURI = "mongodb+srv://admin:password@my-atlas-cluster-01.mongodb.net:27017/dbname?ssl=true&retryWrites=true"

Alternative Go Driver for SRV

If you prefer to use SRV in your connection URI, consider utilizing the mongo-go-driver. Here's an example:

mongoURI := "mongodb+srv://admin:password@my-atlas-cluster-01.mongodb.net/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)
}
database := client.Database("go")
collection := database.Collection("atlas")

Note that this code is compatible with the current version of mongo-go-driver (v1.0.0).

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