zvault/src/repository/backup_file.rs

190 lines
7.7 KiB
Rust

use ::prelude::*;
use std::io::{self, BufReader, BufWriter, Read, Write};
use std::fs::{self, File};
use std::path::{Path, PathBuf};
use std::collections::HashMap;
static HEADER_STRING: [u8; 7] = *b"zvault\x03";
static HEADER_VERSION: u8 = 1;
quick_error!{
#[derive(Debug)]
pub enum BackupFileError {
Read(err: io::Error, path: PathBuf) {
cause(err)
description("Failed to read backup")
display("Backup file error: failed to read backup file {:?}\n\tcaused by: {}", path, err)
}
Write(err: io::Error, path: PathBuf) {
cause(err)
description("Failed to write backup")
display("Backup file error: failed to write backup file {:?}\n\tcaused by: {}", path, err)
}
Decode(err: msgpack::DecodeError, path: PathBuf) {
cause(err)
context(path: &'a Path, err: msgpack::DecodeError) -> (err, path.to_path_buf())
description("Failed to decode backup")
display("Backup file error: failed to decode backup of {:?}\n\tcaused by: {}", path, err)
}
Encode(err: msgpack::EncodeError, path: PathBuf) {
cause(err)
context(path: &'a Path, err: msgpack::EncodeError) -> (err, path.to_path_buf())
description("Failed to encode backup")
display("Backup file error: failed to encode backup of {:?}\n\tcaused by: {}", path, err)
}
WrongHeader(path: PathBuf) {
description("Wrong header")
display("Backup file error: wrong header on backup {:?}", path)
}
UnsupportedVersion(path: PathBuf, version: u8) {
description("Wrong version")
display("Backup file error: unsupported version on backup {:?}: {}", path, version)
}
Decryption(err: EncryptionError, path: PathBuf) {
cause(err)
context(path: &'a Path, err: EncryptionError) -> (err, path.to_path_buf())
description("Decryption failed")
display("Backup file error: decryption failed on backup {:?}\n\tcaused by: {}", path, err)
}
Encryption(err: EncryptionError) {
from()
cause(err)
description("Encryption failed")
display("Backup file error: encryption failed\n\tcaused by: {}", err)
}
PartialBackupsList(partial: HashMap<String, Backup>, failed: Vec<PathBuf>) {
description("Some backups could not be loaded")
display("Backup file error: some backups could not be loaded: {:?}", failed)
}
}
}
#[derive(Default, Debug, Clone)]
struct BackupHeader {
pub encryption: Option<Encryption>
}
serde_impl!(BackupHeader(u8) {
encryption: Option<Encryption> => 0
});
#[derive(Default, Debug, Clone)]
pub struct Backup {
pub root: ChunkList,
pub total_data_size: u64, // Sum of all raw sizes of all entities
pub changed_data_size: u64, // Sum of all raw sizes of all entities actively stored
pub deduplicated_data_size: u64, // Sum of all raw sizes of all new bundles
pub encoded_data_size: u64, // Sum al all encoded sizes of all new bundles
pub bundle_count: usize,
pub chunk_count: usize,
pub avg_chunk_size: f32,
pub timestamp: i64,
pub duration: f32,
pub file_count: usize,
pub dir_count: usize,
pub host: String,
pub path: String,
pub config: Config,
pub modified: bool,
pub user_names: HashMap<u32, String>,
pub group_names: HashMap<u32, String>
}
serde_impl!(Backup(u8?) {
root: ChunkList => 0,
total_data_size: u64 => 1,
changed_data_size: u64 => 2,
deduplicated_data_size: u64 => 3,
encoded_data_size: u64 => 4,
bundle_count: usize => 5,
chunk_count: usize => 6,
avg_chunk_size: f32 => 7,
timestamp: i64 => 8,
duration: f32 => 9,
file_count: usize => 10,
dir_count: usize => 11,
host: String => 12,
path: String => 13,
config: Config => 14,
modified: bool => 15,
user_names: HashMap<u32, String> => 16,
group_names: HashMap<u32, String> => 17
});
impl Backup {
pub fn read_from<P: AsRef<Path>>(crypto: &Crypto, path: P) -> Result<Self, BackupFileError> {
let path = path.as_ref();
let mut file = BufReader::new(try!(File::open(path).map_err(|err| BackupFileError::Read(err, path.to_path_buf()))));
let mut header = [0u8; 8];
try!(file.read_exact(&mut header).map_err(|err| BackupFileError::Read(err, path.to_path_buf())));
if header[..HEADER_STRING.len()] != HEADER_STRING {
return Err(BackupFileError::WrongHeader(path.to_path_buf()))
}
let version = header[HEADER_STRING.len()];
if version != HEADER_VERSION {
return Err(BackupFileError::UnsupportedVersion(path.to_path_buf(), version))
}
let header: BackupHeader = try!(msgpack::decode_from_stream(&mut file).context(path));
let mut data = Vec::new();
try!(file.read_to_end(&mut data).map_err(|err| BackupFileError::Read(err, path.to_path_buf())));
if let Some(ref encryption) = header.encryption {
data = try!(crypto.decrypt(encryption, &data));
}
Ok(try!(msgpack::decode(&data).context(path)))
}
pub fn save_to<P: AsRef<Path>>(&self, crypto: &Crypto, encryption: Option<Encryption>, path: P) -> Result<(), BackupFileError> {
let path = path.as_ref();
let mut data = try!(msgpack::encode(self).context(path));
if let Some(ref encryption) = encryption {
data = try!(crypto.encrypt(encryption, &data));
}
let mut file = BufWriter::new(try!(File::create(path).map_err(|err| BackupFileError::Write(err, path.to_path_buf()))));
try!(file.write_all(&HEADER_STRING).map_err(|err| BackupFileError::Write(err, path.to_path_buf())));
try!(file.write_all(&[HEADER_VERSION]).map_err(|err| BackupFileError::Write(err, path.to_path_buf())));
let header = BackupHeader { encryption: encryption };
try!(msgpack::encode_to_stream(&header, &mut file).context(path));
try!(file.write_all(&data).map_err(|err| BackupFileError::Write(err, path.to_path_buf())));
Ok(())
}
pub fn get_all_from<P: AsRef<Path>>(crypto: &Crypto, path: P) -> Result<HashMap<String, Backup>, BackupFileError> {
let mut backups = HashMap::new();
let base_path = path.as_ref();
let path = path.as_ref();
if !path.exists() {
debug!("Backup root folder does not exist");
return Ok(backups);
}
let mut paths = vec![path.to_path_buf()];
let mut failed_paths = vec![];
while let Some(path) = paths.pop() {
for entry in try!(fs::read_dir(&path).map_err(|e| BackupFileError::Read(e, path.clone()))) {
let entry = try!(entry.map_err(|e| BackupFileError::Read(e, path.clone())));
let path = entry.path();
if path.is_dir() {
paths.push(path);
} else {
let relpath = path.strip_prefix(&base_path).unwrap();
if relpath.extension() != Some("backup".as_ref()) {
continue
}
let name = relpath.with_file_name(relpath.file_stem().unwrap()).to_string_lossy().to_string();
if let Ok(backup) = Backup::read_from(crypto, &path) {
backups.insert(name, backup);
} else {
failed_paths.push(path.clone());
}
}
}
}
if failed_paths.is_empty() {
Ok(backups)
} else {
Err(BackupFileError::PartialBackupsList(backups, failed_paths))
}
}
}