577 lines
16 KiB
Rust
577 lines
16 KiB
Rust
extern crate git2;
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extern crate pretty_env_logger;
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#[macro_use]
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extern crate log;
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extern crate indicatif;
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extern crate notify;
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extern crate tempfile;
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extern crate walkdir;
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use git2::{Cred, Error, FetchOptions, Index, IndexEntry, IndexTime, Progress, PushOptions, RemoteCallbacks, ResetType, Repository, Signature, TreeBuilder};
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use git2::build::{CheckoutBuilder, RepoBuilder};
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use std::fs::{File, create_dir_all, read, remove_file};
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use std::io::Cursor;
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use std::path::{Path, PathBuf};
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use std::string::String;
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use std::str;
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use std::sync::{Arc, Mutex};
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use std::sync::mpsc::{channel, Sender, Receiver};
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use std::thread::{spawn, JoinHandle};
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use indicatif::{ProgressBar, ProgressStyle};
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use notify::{raw_watcher, RecommendedWatcher, RawEvent, Op, RecursiveMode, Watcher};
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use tempfile::TempDir;
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use walkdir::WalkDir;
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pub struct BenchmarkRepositoryInner
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{
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repository: Repository,
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ssh_user: String,
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user_name: String,
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user_email: String,
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}
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pub struct BenchmarkRepository
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{
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inner: Arc<Mutex<BenchmarkRepositoryInner>>,
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autocommit_channel: (Sender<RawEvent>, Receiver<RawEvent>),
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autocommit_directory: Option<TempDir>,
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autocommit_thread: Option<JoinHandle<()>>,
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autocommit_watcher: Option<RecommendedWatcher>,
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autocommit_locks: Arc<Mutex<usize>>,
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}
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pub struct TargetPath
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{
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pub source: PathBuf,
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pub destination: PathBuf,
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}
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impl BenchmarkRepository
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{
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fn progress_bar_style() -> ProgressStyle
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{
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ProgressStyle::default_bar()
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.template("{bar:74.on_black} {percent:>3} %")
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.progress_chars("█▉▊▋▌▍▎▏ ")
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}
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fn transfer_progress_callback(progress: Progress, progress_bar: &mut ProgressBar) -> bool
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{
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progress_bar.set_length(progress.total_objects() as u64);
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progress_bar.set_position(progress.received_objects() as u64);
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// continue the transfer
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true
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}
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fn push_update_reference_callback(reference: &str, status: Option<&str>) -> Result<(), Error>
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{
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match status
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{
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None => trace!("Reference “{}” pushed successfully to remote “origin”", reference),
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Some(error) => panic!("Couldn’t push reference “{}” to remote “origin”: {}", reference, error),
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};
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Ok(())
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}
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fn checkout_progress_callback(path: Option<&Path>, current: usize, total: usize, progress_bar: &mut ProgressBar)
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{
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progress_bar.set_length(total as u64);
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progress_bar.set_position(current as u64);
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}
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fn reset_origin(&self, remote_url: &str) -> &Self
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{
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let inner = self.inner.lock().unwrap();
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let remote = match inner.repository.find_remote("origin")
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{
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Ok(remote) => remote,
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Err(_) =>
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match inner.repository.remote("origin", remote_url)
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{
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Ok(remote) => remote,
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Err(error) => panic!("Could not reset remote “origin”: {}", error),
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},
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};
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info!("Reset origin to “{}”", remote_url);
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self
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}
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fn fetch_branch(&self, branch_name: &str) -> &Self
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{
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let inner = self.inner.lock().unwrap();
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let mut progress_bar = ProgressBar::new(0);
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progress_bar.set_style(BenchmarkRepository::progress_bar_style());
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{
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let mut remote_callbacks = RemoteCallbacks::new();
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remote_callbacks.credentials(
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|_, _, _|
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{
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match Cred::ssh_key_from_agent(&inner.ssh_user)
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{
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Ok(credentials) => Ok(credentials),
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Err(error) => panic!("could not retrieve key pair for SSH authentication as user “{}”: {}", inner.ssh_user, error),
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}
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});
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remote_callbacks.transfer_progress(
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|progress| BenchmarkRepository::transfer_progress_callback(progress, &mut progress_bar));
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let mut fetch_options = FetchOptions::new();
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fetch_options.remote_callbacks(remote_callbacks);
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let mut origin = inner.repository.find_remote("origin").expect("could not find remote “origin”");
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info!("Updating branch “{}”", branch_name);
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if let Err(error) = origin.fetch(&[branch_name], Some(&mut fetch_options), None)
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{
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panic!("failed to fetch branch “{}” from remote “origin”: {}", branch_name, error);
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}
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}
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progress_bar.finish_and_clear();
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trace!("Branch “{}” is up-to-date", branch_name);
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self
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}
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fn init(base_path: &Path) -> Repository
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{
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let repository = match Repository::init_bare(base_path)
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{
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Ok(repository) => repository,
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Err(error) => panic!("failed to initialize Git repository in “{}”: {}", base_path.display(), error),
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};
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info!("Initialized Git repository in “{}”", base_path.display());
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repository
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}
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pub fn new(remote_url: &str, base_path: &Path, ssh_user: &str, user_name: &str, user_email: &str) -> BenchmarkRepository
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{
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let repository = match Repository::open(base_path)
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{
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Ok(repository) =>
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{
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info!("Using existing Git repository");
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repository
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},
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Err(_) => BenchmarkRepository::init(base_path),
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};
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let benchmark_repository_inner =
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BenchmarkRepositoryInner
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{
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repository: repository,
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ssh_user: ssh_user.to_string(),
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user_name: user_name.to_string(),
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user_email: user_email.to_string(),
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};
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let benchmark_repository =
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BenchmarkRepository
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{
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inner: Arc::new(Mutex::new(benchmark_repository_inner)),
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autocommit_channel: channel(),
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autocommit_directory: None,
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autocommit_thread: None,
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autocommit_watcher: None,
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autocommit_locks: Arc::new(Mutex::new(0)),
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};
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benchmark_repository
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.reset_origin(remote_url)
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.fetch_branch("config")
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.fetch_branch("results")
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.fetch_branch("status");
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benchmark_repository
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}
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pub fn read_file_as_index_entry(inner: &BenchmarkRepositoryInner, file_path: &Path, result_file_path: &Path) -> IndexEntry
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{
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// create a new blob with the file contents
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let object_id = match inner.repository.blob_path(file_path)
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{
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Ok(object_id) => object_id,
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Err(error) => panic!("Could not write blob for “{}”: {}", file_path.display(), error),
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};
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info!("Created object “{}” from “{}”", object_id, file_path.display());
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IndexEntry
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{
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ctime: IndexTime::new(0, 0),
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mtime: IndexTime::new(0, 0),
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dev: 0,
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ino: 0,
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mode: 0o100644,
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uid: 0,
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gid: 0,
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file_size: 0,
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id: object_id,
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flags: 0,
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flags_extended: 0,
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path: result_file_path.to_string_lossy().as_bytes().to_owned(),
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}
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}
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pub fn commit_directory(inner: &BenchmarkRepositoryInner, directory_path: &TargetPath, branch_name: &str)
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{
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let mut file_paths = vec![];
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for entry in WalkDir::new(&directory_path.source)
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{
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let entry = entry.unwrap();
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if entry.path().file_name().unwrap() == ".lock" || entry.file_type().is_dir()
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{
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continue;
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}
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let relative_path = entry.path().strip_prefix(&directory_path.source).unwrap();
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trace!("Adding “{}” (from “{}”) to autocommit list", relative_path.display(), entry.path().display());
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file_paths.push(TargetPath{source: entry.path().to_owned(), destination: directory_path.destination.join(&relative_path)});
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}
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BenchmarkRepository::commit_files(&inner, &file_paths, branch_name);
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}
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pub fn commit_files(inner: &BenchmarkRepositoryInner, file_paths: &[TargetPath], branch_name: &str)
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{
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let tip_reference_name = format!("refs/remotes/origin/{}", branch_name);
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let tip_reference = match inner.repository.find_reference(&tip_reference_name)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not find reference “{}”: {}", tip_reference_name, error),
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};
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let parent_tree = match tip_reference.peel_to_tree()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not peel reference to tree: {}", error),
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};
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let mut index = match Index::new()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not create index: {}", error),
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};
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match index.read_tree(&parent_tree)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not read parent tree into index: {}", error),
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};
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for target_path in file_paths
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{
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let index_entry = BenchmarkRepository::read_file_as_index_entry(inner, &target_path.source, &target_path.destination);
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if let Err(error) = index.add(&index_entry)
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{
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panic!("Could not add index entry for “{}”: {}", target_path.destination.display(), error);
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}
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}
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let tree_object_id = match index.write_tree_to(&inner.repository)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not write index to tree: {}", error),
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};
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let tree = match inner.repository.find_tree(tree_object_id)
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{
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Ok(value) => value,
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Err(error) => panic!("Could obtain tree: {}", error),
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};
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info!("Created tree object “{}”", tree_object_id);
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let signature = Signature::now(&inner.user_name, &inner.user_email).expect("Could not create signature");
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let message = format!("Add files");
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let parent = match tip_reference.peel_to_commit()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not peel reference: {}", error),
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};
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let commit_id = match inner.repository.commit(Some(&tip_reference_name), &signature, &signature, &message, &tree, &[&parent])
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{
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Ok(value) => value,
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Err(error) => panic!("Could not write commit: {}", error),
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};
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let push_refspec = format!("refs/remotes/origin/{}:refs/heads/{}", branch_name, branch_name);
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trace!("Created commit “{}”, using refspec “{}”", commit_id, push_refspec);
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let mut remote_callbacks = RemoteCallbacks::new();
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remote_callbacks.credentials(
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|_, _, _|
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{
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match Cred::ssh_key_from_agent(&inner.ssh_user)
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{
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Ok(value) => Ok(value),
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Err(error) => panic!("could not retrieve key pair for SSH authentication as user “{}”: {}", inner.ssh_user, error),
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}
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});
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remote_callbacks.push_update_reference(
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|reference, status| BenchmarkRepository::push_update_reference_callback(reference, status));
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let mut push_options = PushOptions::new();
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push_options.remote_callbacks(remote_callbacks);
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let mut remote = inner.repository.find_remote("origin").expect("");
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remote.push(&[&push_refspec], Some(&mut push_options)).expect("couldn’t push");
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}
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pub fn file_exists(&self, file_path: &Path, branch_name: &str) -> bool
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{
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let inner = self.inner.lock().unwrap();
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let tip_reference_name = format!("refs/remotes/origin/{}", branch_name);
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let tip_reference = match inner.repository.find_reference(&tip_reference_name)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not find reference “{}”: {}", tip_reference_name, error),
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};
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let tree = match tip_reference.peel_to_tree()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not peel reference to tree: {}", error),
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};
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let object_id = match tree.get_path(file_path)
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{
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Ok(tree_entry) => tree_entry.id(),
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Err(error) => return false,
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};
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let blob = match inner.repository.find_blob(object_id)
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{
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Ok(blob) => blob,
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Err(error) => return false,
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};
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true
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}
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pub fn read_file(&self, file_path: &Path, branch_name: &str) -> Option<String>
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{
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let inner = self.inner.lock().unwrap();
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let tip_reference_name = format!("refs/remotes/origin/{}", branch_name);
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let tip_reference = match inner.repository.find_reference(&tip_reference_name)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not find reference “{}”: {}", tip_reference_name, error),
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};
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let tree = match tip_reference.peel_to_tree()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not peel reference to tree: {}", error),
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};
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let object_id = match tree.get_path(file_path)
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{
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Ok(tree_entry) => tree_entry.id(),
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Err(error) => return None,
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};
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let blob = match inner.repository.find_blob(object_id)
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{
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Ok(blob) => blob,
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Err(error) => return None,
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};
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let content = match std::str::from_utf8(blob.content())
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{
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Ok(content) => content,
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Err(error) => panic!("Could not interpret file “{}” as UTF-8: {}", file_path.display(), error),
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};
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Some(content.to_owned())
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}
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fn prepare_autocommit_directory(&mut self)
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{
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match self.autocommit_thread
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{
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Some(_) => (),
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None =>
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{
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let tmp_dir = match TempDir::new()
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{
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Ok(value) => value,
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Err(error) => panic!("Could not create autocommit directory: {}", error),
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};
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trace!("Created temporary autocommit directory in {}", tmp_dir.path().display());
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let lock_file_path = tmp_dir.path().join(".lock");
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if let Err(error) = File::create(&lock_file_path)
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{
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panic!("Could not create lock file “{}”: {}", lock_file_path.display(), error);
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}
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let (sender, receiver) = channel();
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let mut watcher = match raw_watcher(sender)
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{
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Ok(value) => value,
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Err(error) => panic!("Could not create filesystem watcher: {}", error),
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};
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watcher.watch(&tmp_dir, RecursiveMode::Recursive);
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self.autocommit_watcher = Some(watcher);
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self.autocommit_directory = Some(tmp_dir);
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let autocommit_base_path = self.autocommit_directory.as_ref().unwrap().path().to_owned();
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let inner = self.inner.clone();
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let autocommit_locks = self.autocommit_locks.clone();
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let thread = spawn(
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move ||
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{
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trace!("Autocommit thread running");
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let mut active = true;
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loop
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{
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match receiver.recv()
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{
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Ok(RawEvent{path: Some(path), op: Ok(Op::REMOVE), cookie: _}) =>
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{
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if path == lock_file_path
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{
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trace!("Waiting for remaining autocommit locks to be released");
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active = false;
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}
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else
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{
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trace!("Received “remove” event for path “{}”", path.display());
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let stripped_path = match path.strip_prefix(&autocommit_base_path)
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{
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Ok(value) => value,
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Err(error) => panic!("Cannot handle “remove” event for path “{}”", path.display()),
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};
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let mut components = stripped_path.components();
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let branch_name = components.next().unwrap();
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let result_path = stripped_path.strip_prefix(&branch_name).unwrap().parent().unwrap();
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info!("Autocommiting “{}”", result_path.display());
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let inner = inner.lock().unwrap();
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BenchmarkRepository::commit_directory(&inner, &TargetPath{source: path.parent().unwrap().to_owned(), destination: result_path.to_owned()}, &branch_name.as_os_str().to_str().unwrap());
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let mut autocommit_locks = autocommit_locks.lock().unwrap();
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*autocommit_locks -= 1;
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}
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},
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Err(error) => panic!("Error handling notify event: {}", error),
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_ => (),
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}
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let mut autocommit_locks = autocommit_locks.lock().unwrap();
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if *autocommit_locks == 0
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{
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break;
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}
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}
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trace!("Autocommit thread finished");
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});
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self.autocommit_thread = Some(thread);
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}
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}
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}
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pub fn create_autocommit_directory(&mut self, directory_path: &Path, branch_name: &str) -> Result<PathBuf, String>
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{
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self.prepare_autocommit_directory();
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let result_directory_path = self.autocommit_directory.as_ref().unwrap().path().join(branch_name).join(directory_path);
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match create_dir_all(&result_directory_path)
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{
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Ok(_) => (),
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Err(error) => panic!("Could not create result directory: {}", error),
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}
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{
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let lock_file_path = result_directory_path.join(".lock");
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if lock_file_path.exists()
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{
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panic!("Autocommit directory “{}” already locked", lock_file_path.display());
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}
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if let Err(error) = File::create(&lock_file_path)
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{
|
||
panic!("Could not create temporary file “{}”: {}", lock_file_path.display(), error);
|
||
}
|
||
}
|
||
|
||
let mut autocommit_locks = self.autocommit_locks.lock().unwrap();
|
||
*autocommit_locks += 1;
|
||
|
||
Ok(result_directory_path)
|
||
}
|
||
|
||
pub fn wait_for_autocommit_thread(mut self)
|
||
{
|
||
if let None = self.autocommit_thread
|
||
{
|
||
panic!("No autocommit thread started");
|
||
}
|
||
|
||
let lock_file_path = self.autocommit_directory.as_ref().unwrap().path().join(".lock");
|
||
|
||
if let Err(error) = remove_file(&lock_file_path)
|
||
{
|
||
panic!("Could not remove lock file “{}”: {}", lock_file_path.display(), error);
|
||
}
|
||
|
||
info!("Removed lock file");
|
||
|
||
let autocommit_thread = self.autocommit_thread;
|
||
|
||
if let Err(RecvError) = autocommit_thread.unwrap().join()
|
||
{
|
||
panic!("Could not join autocommit thread");
|
||
}
|
||
|
||
self.autocommit_thread = None;
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests
|
||
{
|
||
}
|