280 lines
8.0 KiB
Rust
280 lines
8.0 KiB
Rust
use failure::*;
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use chrono::prelude::*;
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use std::path::{PathBuf, Path};
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use std::collections::HashMap;
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use lazy_static::lazy_static;
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use std::sync::{Mutex, Arc};
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use crate::tools;
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use crate::config::datastore;
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use super::chunk_store::*;
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use super::fixed_index::*;
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use super::dynamic_index::*;
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use chrono::{Utc, TimeZone};
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/// Datastore Management
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///
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/// A Datastore can store severals backups, and provides the
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/// management interface for backup.
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pub struct DataStore {
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chunk_store: Arc<ChunkStore>,
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gc_mutex: Mutex<bool>,
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}
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/// Detailed Backup Information
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#[derive(Debug)]
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pub struct BackupInfo {
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/// Type of backup
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pub backup_type: String,
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/// Unique (for this type) ID
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pub backup_id: String,
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/// Backup timestamp
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pub backup_time: DateTime<Utc>,
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}
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lazy_static!{
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static ref datastore_map: Mutex<HashMap<String, Arc<DataStore>>> = Mutex::new(HashMap::new());
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}
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impl DataStore {
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pub fn lookup_datastore(name: &str) -> Result<Arc<DataStore>, Error> {
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let config = datastore::config()?;
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let (_, store_config) = config.sections.get(name)
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.ok_or(format_err!("no such datastore '{}'", name))?;
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let path = store_config["path"].as_str().unwrap();
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let mut map = datastore_map.lock().unwrap();
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if let Some(datastore) = map.get(name) {
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// Compare Config - if changed, create new Datastore object!
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if datastore.chunk_store.base == PathBuf::from(path) {
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return Ok(datastore.clone());
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}
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}
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let datastore = DataStore::open(name)?;
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let datastore = Arc::new(datastore);
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map.insert(name.to_string(), datastore.clone());
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Ok(datastore)
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}
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pub fn open(store_name: &str) -> Result<Self, Error> {
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let config = datastore::config()?;
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let (_, store_config) = config.sections.get(store_name)
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.ok_or(format_err!("no such datastore '{}'", store_name))?;
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let path = store_config["path"].as_str().unwrap();
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let chunk_store = ChunkStore::open(store_name, path)?;
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Ok(Self {
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chunk_store: Arc::new(chunk_store),
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gc_mutex: Mutex::new(false),
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})
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}
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pub fn create_fixed_writer<P: AsRef<Path>>(&self, filename: P, size: usize, chunk_size: usize) -> Result<FixedIndexWriter, Error> {
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let index = FixedIndexWriter::create(self.chunk_store.clone(), filename.as_ref(), size, chunk_size)?;
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Ok(index)
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}
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pub fn open_fixed_reader<P: AsRef<Path>>(&self, filename: P) -> Result<FixedIndexReader, Error> {
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let index = FixedIndexReader::open(self.chunk_store.clone(), filename.as_ref())?;
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Ok(index)
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}
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pub fn create_dynamic_writer<P: AsRef<Path>>(
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&self, filename: P,
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chunk_size: usize
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) -> Result<DynamicIndexWriter, Error> {
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let index = DynamicIndexWriter::create(
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self.chunk_store.clone(), filename.as_ref(), chunk_size)?;
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Ok(index)
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}
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pub fn open_dynamic_reader<P: AsRef<Path>>(&self, filename: P) -> Result<DynamicIndexReader, Error> {
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let index = DynamicIndexReader::open(self.chunk_store.clone(), filename.as_ref())?;
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Ok(index)
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}
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pub fn base_path(&self) -> PathBuf {
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self.chunk_store.base_path()
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}
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pub fn get_backup_dir(
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&self,
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backup_type: &str,
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backup_id: &str,
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backup_time: DateTime<Utc>,
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) -> PathBuf {
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let mut relative_path = PathBuf::new();
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relative_path.push(backup_type);
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relative_path.push(backup_id);
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let date_str = backup_time.format("%Y-%m-%dT%H:%M:%S").to_string();
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relative_path.push(&date_str);
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relative_path
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}
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pub fn create_backup_dir(
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&self,
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backup_type: &str,
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backup_id: &str,
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backup_time: i64,
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) -> Result<PathBuf, Error> {
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let mut relative_path = PathBuf::new();
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relative_path.push(backup_type);
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relative_path.push(backup_id);
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let dt = Utc.timestamp(backup_time, 0);
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let date_str = dt.format("%Y-%m-%dT%H:%M:%S").to_string();
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println!("date: {}", date_str);
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relative_path.push(&date_str);
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let mut full_path = self.base_path();
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full_path.push(&relative_path);
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std::fs::create_dir_all(&full_path)?;
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Ok(relative_path)
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}
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pub fn list_backups(&self) -> Result<Vec<BackupInfo>, Error> {
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let path = self.base_path();
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let mut list = vec![];
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lazy_static! {
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static ref BACKUP_TYPE_REGEX: regex::Regex = regex::Regex::new(r"^(host|vm|ct)$").unwrap();
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static ref BACKUP_ID_REGEX: regex::Regex = regex::Regex::new(r"^[A-Za-z][A-Za-z0-9_-]+$").unwrap();
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static ref BACKUP_DATE_REGEX: regex::Regex = regex::Regex::new(
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r"^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}$").unwrap();
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}
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tools::scandir(libc::AT_FDCWD, &path, &BACKUP_TYPE_REGEX, |l0_fd, backup_type, file_type| {
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if file_type != nix::dir::Type::Directory { return Ok(()); }
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tools::scandir(l0_fd, backup_type, &BACKUP_ID_REGEX, |l1_fd, backup_id, file_type| {
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if file_type != nix::dir::Type::Directory { return Ok(()); }
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tools::scandir(l1_fd, backup_id, &BACKUP_DATE_REGEX, |_, backup_time, file_type| {
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if file_type != nix::dir::Type::Directory { return Ok(()); }
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let dt = Utc.datetime_from_str(backup_time, "%Y-%m-%dT%H:%M:%S")?;
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list.push(BackupInfo {
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backup_type: backup_type.to_owned(),
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backup_id: backup_id.to_owned(),
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backup_time: dt,
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});
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Ok(())
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})
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})
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})?;
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Ok(list)
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}
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pub fn list_images(&self) -> Result<Vec<PathBuf>, Error> {
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let base = self.base_path();
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let mut list = vec![];
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use walkdir::WalkDir;
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let walker = WalkDir::new(&base).same_file_system(true).into_iter();
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// make sure we skip .chunks (and other hidden files to keep it simple)
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fn is_hidden(entry: &walkdir::DirEntry) -> bool {
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entry.file_name()
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.to_str()
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.map(|s| s.starts_with("."))
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.unwrap_or(false)
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}
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for entry in walker.filter_entry(|e| !is_hidden(e)) {
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let path = entry?.into_path();
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if let Some(ext) = path.extension() {
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if ext == "fidx" {
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list.push(path);
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} else if ext == "didx" {
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list.push(path);
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}
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}
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}
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Ok(list)
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}
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fn mark_used_chunks(&self, status: &mut GarbageCollectionStatus) -> Result<(), Error> {
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let image_list = self.list_images()?;
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for path in image_list {
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if let Some(ext) = path.extension() {
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if ext == "fidx" {
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let index = self.open_fixed_reader(&path)?;
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index.mark_used_chunks(status)?;
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} else if ext == "didx" {
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let index = self.open_dynamic_reader(&path)?;
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index.mark_used_chunks(status)?;
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}
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}
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}
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Ok(())
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}
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pub fn garbage_collection(&self) -> Result<(), Error> {
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if let Ok(ref mut _mutex) = self.gc_mutex.try_lock() {
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let mut gc_status = GarbageCollectionStatus::default();
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gc_status.used_bytes = 0;
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println!("Start GC phase1 (mark chunks)");
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self.mark_used_chunks(&mut gc_status)?;
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println!("Start GC phase2 (sweep unused chunks)");
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self.chunk_store.sweep_unused_chunks(&mut gc_status)?;
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println!("Used bytes: {}", gc_status.used_bytes);
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println!("Used chunks: {}", gc_status.used_chunks);
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println!("Disk bytes: {}", gc_status.disk_bytes);
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println!("Disk chunks: {}", gc_status.disk_chunks);
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} else {
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println!("Start GC failed - (already running/locked)");
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}
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Ok(())
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}
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}
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