Rust

Connect a Rust application to TeselaDB with the official MongoDB driver for Rust. TeselaDB presents itself as a mongos, so the driver works unchanged.

Requirements

• Rust with Cargo.
• The address of one or more nodes, a user with readWrite on the database and the pki/ca.pem file of the cluster.

Install the driver

cargo add mongodb tokio --features tokio/full

Store the connection string

Put the string in an environment variable instead of writing it in the code:

export TESELADB_URI="mongodb://user:<password>@node-01:27017,node-02:27017/shop?tls=true&tlsCAFile=./ca.pem"

Write and read a document

let client = mongodb::Client::with_uri_str(std::env::var("TESELADB_URI")?).await?;
let orders = client.database("shop").collection::<mongodb::bson::Document>("orders");
orders.insert_one(mongodb::bson::doc! { "total": 149.5 }).await?;
println!("{}", orders.count_documents(mongodb::bson::doc! {}).await?);

Check

The program prints the number of documents in orders, which grows by one each time you run it.

Common problems

• The connection closes before authenticating because tls=true is missing from the string.
• The driver does not trust the node certificate because it does not have the CA of this cluster.

See also

• Connection string and options
• Read and write documents