mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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use bson::{bson, doc};
use serde::Deserialize;

use crate::{
    cmap::{options::ConnectionPoolOptions, Command, ConnectionPool},
    selection_criteria::ReadPreference,
    test::{CLIENT, LOCK},
};

#[derive(Debug, Deserialize)]
struct ListDatabasesResponse {
    databases: Vec<DatabaseEntry>,
}

#[derive(Debug, Deserialize)]
struct DatabaseEntry {
    name: String,
}

#[test]
fn acquire_connection_and_send_command() {
    let _guard = LOCK.run_concurrently();

    let client_options = CLIENT.options.clone();
    let pool_options = ConnectionPoolOptions::from_client_options(&client_options);

    let pool = ConnectionPool::new(client_options.hosts[0].clone(), Some(pool_options));
    let mut connection = pool.check_out().unwrap();

    let body = doc! { "listDatabases": 1 };
    let read_pref = ReadPreference::PrimaryPreferred {
        tag_sets: None,
        max_staleness: None,
    };
    let cmd = Command::new_read(
        "listDatabases".to_string(),
        "admin".to_string(),
        Some(read_pref),
        body,
    );
    let response = connection.send_command(cmd, None).unwrap();

    assert!(response.is_success());

    let response: ListDatabasesResponse = response.body().unwrap();

    let names: Vec<_> = response
        .databases
        .into_iter()
        .map(|entry| entry.name)
        .collect();

    assert!(names.iter().any(|name| name == "admin"));
    assert!(names.iter().any(|name| name == "config"));
}