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The driver uses the tracing crate for all logs.
To view the logs you have to create a tracing subscriber to which all logs will be written.
To just print the logs you can use the default subscriber:
use tracing::info;
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
// Install global collector configured based on RUST_LOG env var
// This collector will receive logs from the driver
tracing_subscriber::fmt::init();
let uri = std::env::var("SCYLLA_URI")
.unwrap_or_else(|_| "127.0.0.1:9042".to_string());
info!("Connecting to {}", uri);
let session: Session = SessionBuilder::new().known_node(uri).build().await?;
session
.query(
"CREATE KEYSPACE IF NOT EXISTS ks WITH REPLICATION = \
{'class' : 'NetworkTopologyStrategy', 'replication_factor' : 1}",
&[],
)
.await?;
// This query should generate a warning message
session.query("USE ks", &[]).await?;
Ok(())
}
To start this example execute:
RUST_LOG=info cargo run
The full example is available in the examples folder
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