Find the mongo server version and replica set information from golang client.

getMongoVersionAndReplSetInfo.go

package main

import (
  "context"
  "fmt"
  "log"

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

func main() {
  url := "mongodb://localhost:27017"

  clientOptions := options.Client().ApplyURI(url)

  client, err := mongo.Connect(context.Background(), clientOptions)

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

  err = client.Ping(context.Background(), nil)

  if err != nil {
    log.Fatal(err)
  }
  fmt.Println("Connected to MongoDB!")
  
  type MongoMetaData struct {
    Version string `json:"version"`
    Set     string `json:"set"`
  }

  mongoMetaData := MongoMetaData{}
  client.Database("test").RunCommand(nil, bsonx.Doc{{"buildInfo", bsonx.Int32(1)}}).Decode(&mongoMetaData)
  fmt.Println(mongoMetaData.Version)

  client.Database("admin").RunCommand(nil, bsonx.Doc{{"replSetGetStatus", bsonx.Int32(1)}}).Decode(&mongoMetaData)
  fmt.Println(mongoMetaData.Set)

}