How to use go mongo-driver db.getUser()

php editor Youzi will introduce to you how to use the db.getUser() method in go mongo-driver. When using the MongoDB database, the getUser() method is a very practical function that can be used to obtain detailed information of a specified user. Through the guidance of this article, you will learn how to use this method correctly and obtain the required user information. Read this article and let’s explore this useful feature together!

Question content

I want to get user details of database using go driver.

For example. In mongoshell

> db.getuser("testuser")
null

How do I build bson.m or bson.d for this?

I don’t want to pass additional parameters, just retrieve the user information from the database

var op bson.m
command := bson.d{{"getuser", 1}, {"username", "testuser"}}
err = clientinfo.database(db).runcommand(context.todo(), cmd).decode(&op)

I tried something like the above, but it returned the following error:

(CommandNotFound) no such command: 'getUser'

What am I missing here?

Solution

database.runcommand() is to facilitate calling mongodb’s runcommand() Function, that is, running the specified database command .

In other words, the getuser() function you call in the mongo shell is a function, not a command.

But there is a usersinfo command to get the same data. Its syntax is:

db.runcommand(
   {
     usersinfo: <various>,
     showcredentials: <boolean>,
     showcustomdata: <boolean>,
     showprivileges: <boolean>,
     showauthenticationrestrictions: <boolean>,
     filter: <document>,
     comment: <any>
   }
)

This is how to execute the usersinfo command:

var op bson.m
cmd := bson.d{{key: "usersinfo", value: bson.m{
    "user": "testuser",
    "db":   "admin",
}}}
err = clientinfo.database(db).runcommand(ctx, cmd).decode(&op)

Please note that the usersinfo document has various specifications, such as:

{ usersinfo: 1 }

Returns information about the user in the database running the command. mongosh Provides a db.getusers() helper for invocations of this command.

{ usersinfo: <username> }

Returns information about the specific user that exists in the database running the command. mongosh Provides a db.getuser() helper for invocations of this command.

{ usersinfo: { user: <name>, db: <db> } }

Return information about the user specified by name and database.

{ usersinfo: [ { user: <name>, db: <db> }, ... ] }
{ usersinfo: [ <username1>, ... ] }

Return information about the specified user.

{ foralldbs: true }

Return information about all users in the database.

As you can see, the getuser() command is short for { usersinfo: <username> } and you can call it like this:

var op bson.m
cmd := bson.d{{key: "usersinfo", value: "testuser"}}
err = clientinfo.database(db).runcommand(ctx, cmd).decode(&op)

If you want information about multiple users, you can of course use an array:

cmd := bson.D{{Key: "usersInfo", Value: []string{"testuser", "anotheruser"}}}

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