Function display_format

vm-migration/src/context.rs:665–691

The display format is specifically crafted to be very insightful in logs. Therefore, we have a dedicated test for that format.

()

        /// The display format is specifically crafted to be very insightful in logs.
        /// Therefore, we have a dedicated test for that format.
        fn display_format() {
            let s = Scenario::new();
            let mut ctx = s.make_ctx();

            // Iteration 0: 1 MiB in 1s
            ctx.update_metrics_before_transfer(s.iteration_begin, &make_table(1024 * 1024));
            ctx.update_metrics_after_transfer(s.transfer_begin, Duration::from_secs(1));
            ctx.iteration += 1;

            // Iteration 1: 512 KiB in 1s; fix migration_duration for deterministic elapsed/avg_bw
            ctx.update_metrics_before_transfer(s.iteration_begin, &make_table(512 * 1024));
            ctx.update_metrics_after_transfer(s.transfer_begin, Duration::from_secs(1));

            ctx.migration_duration = Some(Duration::from_secs(2));
            let out = ctx.to_string();

            assert_eq!(
                out,
                "iter=1 curr=1MiB total=2MiB bw=0.50MiB/s transfer=1.00s overhead=8000ms est_downtime=500ms elapsed=2.00s avg_bw=0.15MiB/s"
            );

            // Should change elapsed() time!
            // Since this is at least 10s, we never face timing issues in CI!
            ctx.finalize();
            let out2 = ctx.to_string();
            assert_ne!(out2, out, "elapsed time should have changed! is={out2}");
        }
    }
}