您如何使用官方的mongo-go-driver连接到MongoDB Atlas [重复]

I am hosting my test Atlas cluster on AWS so I wanted to have similar credential management to the AWS process. From the AWS credentials page:

The default provider chain looks for credentials in the following order:

1. Environment variables.

2. Shared credentials file.

3. If your application is running on an Amazon EC2 instance, IAM role for Amazon EC2.

Therefore, I wanted to implement the environment veriable for my simple login to Atlas example. Code below assumes that the following line has been issued at the command line

export MONGO_PW='<your Atlas admin user password>'

Then the following program will verify your connection

package main

import (
    "context"
    "fmt"
    "os"

    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

var username = "<username>"
var host1 = "<atlas host>"  // of the form foo.mongodb.net

func main() {

    ctx := context.TODO()

    pw, ok := os.LookupEnv("MONGO_PW")
    if !ok {
        fmt.Println("error: unable to find MONGO_PW in the environment")
        os.Exit(1)
    }
    mongoURI := fmt.Sprintf("mongodb+srv://%s:%s@%s", username, pw, host1)
    fmt.Println("connection string is:", mongoURI)

    // Set client options and connect
    clientOptions := options.Client().ApplyURI(mongoURI)
    client, err := mongo.Connect(ctx, clientOptions)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    err = client.Ping(ctx, nil)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    fmt.Println("Connected to MongoDB!")
}

From here the rest of the tutorial linked in my original question goes smoothly.