mongodb 1.1.0-beta

The official MongoDB driver for Rust
Documentation 
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use std::time::Duration;

use crate::{
    bson::{doc, Bson},
    error::ErrorKind,
    options::{Acknowledgment, InsertOneOptions, WriteConcern},
    test::{TestClient, LOCK},
};

#[test]
fn write_concern_is_acknowledged() {
    let w_1 = WriteConcern::builder()
        .w(Acknowledgment::Nodes(1))
        .journal(false)
        .build();
    assert!(w_1.is_acknowledged());

    let w_majority = WriteConcern::builder()
        .w(Acknowledgment::Majority)
        .journal(false)
        .build();
    assert!(w_majority.is_acknowledged());

    let w_0 = WriteConcern::builder()
        .w(Acknowledgment::Nodes(0))
        .journal(false)
        .build();
    assert!(!w_0.is_acknowledged());

    let w_0 = WriteConcern::builder().w(Acknowledgment::Nodes(0)).build();
    assert!(!w_0.is_acknowledged());

    let empty = WriteConcern::builder().build();
    assert!(empty.is_acknowledged());

    let empty = WriteConcern::builder().journal(false).build();
    assert!(empty.is_acknowledged());

    let empty = WriteConcern::builder().journal(true).build();
    assert!(empty.is_acknowledged());
}

#[test]
fn write_concern_deserialize() {
    let w_1 = doc! { "w": 1 };
    let wc: WriteConcern = bson::from_bson(Bson::Document(w_1)).unwrap();
    assert_eq!(
        wc,
        WriteConcern {
            w: Acknowledgment::Nodes(1).into(),
            w_timeout: None,
            journal: None
        }
    );

    let w_majority = doc! { "w": "majority" };
    let wc: WriteConcern = bson::from_bson(Bson::Document(w_majority)).unwrap();
    assert_eq!(
        wc,
        WriteConcern {
            w: Acknowledgment::Majority.into(),
            w_timeout: None,
            journal: None
        }
    );

    let w_timeout = doc! { "w": "majority", "wtimeout": 100 };
    let wc: WriteConcern = bson::from_bson(Bson::Document(w_timeout)).unwrap();
    assert_eq!(
        wc,
        WriteConcern {
            w: Acknowledgment::Majority.into(),
            w_timeout: Duration::from_millis(100).into(),
            journal: None
        }
    );

    let journal = doc! { "w": "majority", "j": true };
    let wc: WriteConcern = bson::from_bson(Bson::Document(journal)).unwrap();
    assert_eq!(
        wc,
        WriteConcern {
            w: Acknowledgment::Majority.into(),
            w_timeout: None,
            journal: true.into()
        }
    );
}

#[cfg_attr(feature = "tokio-runtime", tokio::test)]
#[cfg_attr(feature = "async-std-runtime", async_std::test)]
#[function_name::named]
async fn inconsistent_write_concern_rejected() {
    let _guard = LOCK.run_concurrently().await;

    let client = TestClient::new().await;
    let db = client.database(function_name!());
    let error = db
        .run_command(
            doc! {
                "insert": function_name!(),
                "documents": [ {} ],
                "writeConcern": { "w": 0, "j": true }
            },
            None,
        )
        .await
        .expect_err("insert should fail");
    assert!(matches!(error.kind.as_ref(), ErrorKind::ArgumentError { .. }));

    let coll = db.collection(function_name!());
    let wc = WriteConcern {
        w: Acknowledgment::Nodes(0).into(),
        journal: true.into(),
        w_timeout: None,
    };
    let options = InsertOneOptions::builder().write_concern(wc).build();
    let error = coll
        .insert_one(doc! {}, options)
        .await
        .expect_err("insert should fail");
    assert!(matches!(error.kind.as_ref(), ErrorKind::ArgumentError { .. }));
}

#[cfg_attr(feature = "tokio-runtime", tokio::test)]
#[cfg_attr(feature = "async-std-runtime", async_std::test)]
#[function_name::named]
async fn unacknowledged_write_concern_rejected() {
    let _guard = LOCK.run_concurrently().await;

    let client = TestClient::new().await;
    let db = client.database(function_name!());
    let error = db
        .run_command(
            doc! {
                "insert": function_name!(),
                "documents": [ {} ],
                "writeConcern": { "w": 0 }
            },
            None,
        )
        .await
        .expect_err("insert should fail");
    assert!(matches!(error.kind.as_ref(), ErrorKind::ArgumentError { .. }));
}