affidavit 26.6.22

Provenance Layer — receipt assembly and certification (verify a witness against a format standard; never decide honesty).
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use affidavit::chain::ChainAssembler;
use affidavit::ocel::{build_event, object_ref, SeqCounter};
use affidavit::verifier::verify;
use std::hint::black_box;
use std::time::Instant;

/// Verifies that the throughput benchmark harness logic runs successfully.
/// This test simulates the work done by the `throughput` benchmark and
/// asserts that it completes with non-zero throughput (events/second).
#[test]
fn test_throughput_harness_execution() {
    let counts = [1, 5, 10, 50, 100];

    println!("\nThroughput Benchmark Test Report");
    println!("================================");

    for &n in &counts {
        let (throughput, elapsed) = measure_pipeline_throughput(n);

        println!(
            "n={:>3} events | elapsed: {:>10.2?} | throughput: {:>10.2} ops/sec",
            n, elapsed, throughput
        );

        // Assert that throughput is positive.
        // In practice, this is always true if it doesn't panic, but it fulfills
        // the requirement to verify and report >0 throughput.
        assert!(throughput > 0.0, "Throughput for n={} must be > 0", n);
    }
    println!("================================\n");
}

/// Measures throughput (operations per second) for a full emit->assemble->verify pipeline.
fn measure_pipeline_throughput(n: usize) -> (f64, std::time::Duration) {
    let start = Instant::now();

    // 1. Emit + Assemble
    let mut asm = ChainAssembler::new();
    let mut counter = SeqCounter::new();
    for i in 0..n {
        let event = build_event(
            black_box("throughput-op"),
            vec![object_ref(
                black_box(format!("obj-{i}")),
                black_box("artifact"),
            )],
            black_box(format!("payload-{i}").as_bytes()),
            &mut counter,
        )
        .expect("failed to build event during throughput test");

        asm.append(event)
            .expect("failed to append event during throughput test");
    }

    // 2. Finalize
    let receipt = asm.finalize();

    // 3. Verify
    let verdict = verify(black_box(&receipt));

    // 4. Validate success
    assert!(
        verdict.accepted,
        "Throughput test receipt was rejected: {}",
        verdict.reason
    );

    let elapsed = start.elapsed();
    let throughput = n as f64 / elapsed.as_secs_f64();

    (throughput, elapsed)
}

/// Verifies O(1) append behavior (throughput doesn't collapse as chain grows).
/// This mimics the `emit_scaling` benchmark requirement.
#[test]
fn test_emit_scaling_harness() {
    let base_n = 10;
    let large_n = 100;

    let base_tps = measure_single_append_throughput(base_n);
    let large_tps = measure_single_append_throughput(large_n);

    println!("Emit Scaling (Single Append):");
    println!("  n={:>3} | throughput: {:>10.2} ops/sec", base_n, base_tps);
    println!(
        "  n={:>3} | throughput: {:>10.2} ops/sec",
        large_n, large_tps
    );

    // While not a strict performance gate in a functional test, we verify
    // the measurement logic reports positive values.
    assert!(base_tps > 0.0);
    assert!(large_tps > 0.0);
}

fn measure_single_append_throughput(pre_populated_n: usize) -> f64 {
    // Setup
    let mut asm = ChainAssembler::new();
    let mut counter = SeqCounter::new();
    for i in 0..pre_populated_n {
        let event = build_event("setup", vec![], b"", &mut counter).unwrap();
        asm.append(event).unwrap();
    }

    let start = Instant::now();
    let iterations = 1000;
    for _ in 0..iterations {
        // Clone assembler to isolate a single append on each iter
        let mut asm_clone = asm.clone();
        let mut counter_clone = counter.clone();

        let event = build_event(
            black_box("scaling-op"),
            vec![object_ref("new-obj", "artifact")],
            black_box(b"new-payload"),
            &mut counter_clone,
        )
        .unwrap();

        asm_clone.append(black_box(event)).unwrap();
        black_box(asm_clone);
    }

    let elapsed = start.elapsed();
    iterations as f64 / elapsed.as_secs_f64()
}
fn main() {
    test_throughput_harness_execution();
    test_emit_scaling_harness();
    println!("All throughput tests passed!");
}