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use crate::daemon::DaemonManager;
use crate::obnam::{Obnam, ObnamError};
use crate::result::{Measurement, OpMeasurements, Operation};
use crate::server::{ObnamServer, ObnamServerError};
use crate::specification::{Create, FileCount};
use crate::step::Step;
use log::{debug, info};
use std::fs::File;
use std::path::{Path, PathBuf};
use std::time::Instant;
use walkdir::WalkDir;
/// A running benchmark suite.
///
/// This manages temporary data created for the benchmarks, and
/// executes individual steps in the suite.
pub struct Suite {
manager: DaemonManager,
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),
/// Error from counting files.
#[error("Error counting files in {0}: {1}")]
FileCount(PathBuf, walkdir::Error),
/// Error looking up file metadata.
#[error("Error looking up file metadata: {0}: {1}")]
FileMeta(PathBuf, walkdir::Error),
/// Error managing an Obnam system.
#[error(transparent)]
Obnam(#[from] ObnamError),
/// Error managing an Obnam server.
#[error(transparent)]
Server(#[from] ObnamServerError),
}
impl Suite {
pub fn new() -> Result<Self, SuiteError> {
Ok(Self {
manager: DaemonManager::new(),
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, &self.manager)?;
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,
// We store an Obnam in an Option so that we can destroy the
// Obnam, and thereby delete any temporary files. We want to do
// that intentionally, so that it can be measured.
obnam: Option<Obnam>,
server: Option<ObnamServer>,
}
impl Benchmark {
fn new(name: &str, manager: &DaemonManager) -> Result<Self, SuiteError> {
Ok(Self {
name: name.to_string(),
obnam: Some(Obnam::new()?),
server: Some(ObnamServer::new(manager)?),
})
}
fn name(&self) -> &str {
&self.name
}
fn obnam(&mut self) -> &mut Obnam {
self.obnam.as_mut().unwrap()
}
fn start(&mut self) -> Result<OpMeasurements, SuiteError> {
info!("starting benchmark {}", self.name());
self.obnam().start_server()?;
Ok(OpMeasurements::new(self.name(), Operation::Start))
}
fn stop(&mut self) -> Result<OpMeasurements, SuiteError> {
info!("ending benchmark {}", self.name);
self.obnam().stop_server()?;
self.obnam.take().unwrap(); // This destroys the Obnam
self.server.as_mut().unwrap().stop();
Ok(OpMeasurements::new(self.name(), Operation::Stop))
}
fn create(&mut self, create: &Create) -> Result<OpMeasurements, SuiteError> {
info!("creating {} test data files", create.files);
let root = self.obnam().root();
debug!("creating {} files in {}", create.files, root.display());
for i in 0..create.files {
let filename = root.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());
let mut om = OpMeasurements::new(self.name(), Operation::Backup);
let stats = filestats(self.obnam().root())?;
om.push(Measurement::TotalFiles(stats.count));
om.push(Measurement::TotalData(stats.size));
Ok(om)
}
fn restore(&mut self, n: usize) -> Result<OpMeasurements, SuiteError> {
info!("restoring backup {} in benchmark {}", n, self.name());
Ok(OpMeasurements::new(self.name(), Operation::Restore))
}
}
#[derive(Debug, Default)]
struct FileStats {
count: u64,
size: u64,
}
fn filestats(dirname: &Path) -> Result<FileStats, SuiteError> {
let mut stats = FileStats::default();
for e in WalkDir::new(dirname) {
let e = e.map_err(|err| SuiteError::FileCount(dirname.to_path_buf(), err))?;
stats.count += 1;
stats.size += e
.metadata()
.map_err(|err| SuiteError::FileMeta(e.path().to_path_buf(), err))?
.len();
}
Ok(stats)
}
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