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use crate::result::{Measurement, OpMeasurements, Operation};
use crate::specification::{Create, FileCount};
use crate::step::Step;
use log::{debug, info};
use std::fs::File;
use std::path::PathBuf;
use std::time::Instant;
use tempfile::{tempdir, TempDir};
/// A running benchmark suite.
///
/// This manages temporary data created for the benchmarks, and
/// executes individual steps in the suite.
pub struct Suite {
benchmark: Option<Benchmark>,
}
/// Possible errors from running a benchmark suite.
#[derive(Debug, thiserror::Error)]
pub enum SuiteError {
/// Error creating a temporary directory.
#[error(transparent)]
TempDir(#[from] std::io::Error),
/// File creation failed.
#[error("Failed to create file {0}: {1}")]
CreateFile(PathBuf, std::io::Error),
}
impl Suite {
pub fn new() -> Result<Self, SuiteError> {
Ok(Self { benchmark: None })
}
/// Execute one step in the benchmark suite.
///
/// Return a measurement of the step.
pub fn execute(&mut self, step: &Step) -> Result<OpMeasurements, SuiteError> {
debug!("executing step {:?}", step);
let time = Instant::now();
let mut om = match step {
Step::Start(name) => {
assert!(self.benchmark.is_none());
let mut benchmark = Benchmark::new(name)?;
let om = benchmark.start()?;
self.benchmark = Some(benchmark);
om
}
Step::Stop(name) => {
assert!(self.benchmark.is_some());
assert_eq!(name, self.benchmark.as_ref().unwrap().name());
let om = self.benchmark.as_mut().unwrap().stop()?;
self.benchmark = None;
om
}
Step::Create(x) => {
assert!(self.benchmark.is_some());
self.benchmark.as_mut().unwrap().create(x)?
}
Step::Rename(x) => {
assert!(self.benchmark.is_some());
self.benchmark.as_mut().unwrap().rename(x)?
}
Step::Delete(x) => {
assert!(self.benchmark.is_some());
self.benchmark.as_mut().unwrap().delete(x)?
}
Step::Backup(x) => {
assert!(self.benchmark.is_some());
self.benchmark.as_mut().unwrap().backup(*x)?
}
Step::Restore(x) => {
assert!(self.benchmark.is_some());
self.benchmark.as_mut().unwrap().restore(*x)?
}
};
let t = std::time::Duration::from_millis(10);
std::thread::sleep(t);
let ms = time.elapsed().as_millis();
debug!("step duration was {} ms", ms);
om.push(Measurement::DurationMs(ms));
Ok(om)
}
}
struct Benchmark {
name: String,
tempdir: Option<TempDir>,
}
impl Benchmark {
fn new(name: &str) -> Result<Self, SuiteError> {
Ok(Self {
name: name.to_string(),
tempdir: Some(tempdir()?),
})
}
fn name(&self) -> &str {
&self.name
}
fn tempdir(&self) -> &TempDir {
self.tempdir.as_ref().unwrap()
}
fn start(&mut self) -> Result<OpMeasurements, SuiteError> {
info!("starting benchmark {}", self.name());
Ok(OpMeasurements::new(self.name(), Operation::Start))
}
fn stop(&mut self) -> Result<OpMeasurements, SuiteError> {
info!("ending benchmark {}", self.name);
self.tempdir.take().unwrap().close()?;
Ok(OpMeasurements::new(self.name(), Operation::Stop))
}
fn create(&mut self, create: &Create) -> Result<OpMeasurements, SuiteError> {
info!("creating {} test data files", create.files);
let tempdir = self.tempdir().path();
debug!("creating {} files in {}", create.files, tempdir.display());
for i in 0..create.files {
let filename = tempdir.join(format!("{}", i));
debug!("creating {}", filename.display());
File::create(&filename).map_err(|err| SuiteError::CreateFile(filename, err))?;
}
Ok(OpMeasurements::new(self.name(), Operation::Create))
}
fn rename(&mut self, count: &FileCount) -> Result<OpMeasurements, SuiteError> {
info!("renaming {} test data files", count.files);
Ok(OpMeasurements::new(self.name(), Operation::Rename))
}
fn delete(&mut self, count: &FileCount) -> Result<OpMeasurements, SuiteError> {
info!("deleting {} test data files", count.files);
Ok(OpMeasurements::new(self.name(), Operation::Delete))
}
fn backup(&mut self, n: usize) -> Result<OpMeasurements, SuiteError> {
info!("making backup {} in benchmark {}", n, self.name());
Ok(OpMeasurements::new(self.name(), Operation::Backup))
}
fn restore(&mut self, n: usize) -> Result<OpMeasurements, SuiteError> {
info!("restoring backup {} in benchmark {}", n, self.name());
Ok(OpMeasurements::new(self.name(), Operation::Restore))
}
}
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