Remove unused `wrk-api-bench` dependency (#2331)

assert_cmd = "2.0"

home = "0.5"

serial_test = "0.7.0"

wrk-api-bench = "0.0.8"

# This dependency is only required for testing the `pokemon-service-tls` program.

hyper-rustls = { version = "0.23.0", features = ["http2"] }

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0

 */

use std::{env, fs::OpenOptions, io::Write, path::Path, time::Duration};

use tokio::time;

use wrk_api_bench::{BenchmarkBuilder, HistoryPeriod, WrkBuilder};

use crate::helpers::PokemonService;

mod helpers;

#[tokio::test]

async fn benchmark() -> Result<(), Box<dyn std::error::Error>> {

    // Benchmarks are expensive, so they run only if the environment

    // variable `RUN_BENCHMARKS` is present.

    if env::var_os("RUN_BENCHMARKS").is_some() {

        let _program = PokemonService::run();

        // Give PokémonService some time to start up.

        time::sleep(Duration::from_millis(50)).await;

        // The history directory is cached inside GitHub actions under

        // the running use home directory to allow us to recover historical

        // data between runs.

        let history_dir = if env::var_os("GITHUB_ACTIONS").is_some() {

            home::home_dir().unwrap().join(".wrk-api-bench")

        } else {

            Path::new(".").join(".wrk-api-bench")

        };

        let mut wrk = WrkBuilder::default()

            .url(String::from("http://localhost:13734/empty-operation"))

            .history_dir(history_dir)

            .build()?;

        // Run a single benchmark with 8 threads and 64 connections for 60 seconds.

        let benches = vec![BenchmarkBuilder::default()

            .duration(Duration::from_secs(90))

            .threads(2)

            .connections(32)

            .build()?];

        wrk.bench(&benches)?;

        // Calculate deviation from last run and write it to disk.

        if let Ok(deviation) = wrk.deviation(HistoryPeriod::Last) {

            let mut deviation_file = OpenOptions::new()

                .create(true)

                .write(true)

                .truncate(true)

                .open("/tmp/smithy_rs_benchmark_deviation.txt")

                .unwrap();

            deviation_file.write_all(deviation.to_github_markdown().as_bytes())?;

        }

    }

    Ok(())

}