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|
use hbak_common::config::NodeConfig;
use hbak_common::conn::{AuthServ, DEFAULT_PORT};
use hbak_common::message::SyncInfo;
use hbak_common::proto::{LocalNode, Node, Snapshot};
use hbak_common::{LocalNodeError, NetworkError, RemoteError};
use std::collections::HashMap;
use std::fs::{self, File};
use std::io;
use std::net::{IpAddr, Ipv6Addr, SocketAddr, TcpListener, TcpStream};
use std::thread;
use clap::Parser;
use fork::{daemon, Fork};
#[derive(Debug, Parser)]
#[command(author, version, about, long_about = None)]
/// Background process to serve push and pull requests.
struct Args {
/// Stay attached to the terminal instead of daemonizing.
#[arg(short, long)]
debug: bool,
}
fn main() {
let args = Args::parse();
if args.debug {
match serve() {
Ok(_) => {}
Err(e) => eprintln!("Error: {}", e),
}
} else {
match daemon(false, false) {
Ok(Fork::Parent(_)) => {}
Ok(Fork::Child) => match serve() {
Ok(_) => {}
Err(e) => eprintln!("Error: {}", e),
},
Err(e) => eprintln!("Error: {}", io::Error::from_raw_os_error(e)),
}
}
}
fn serve() -> Result<(), LocalNodeError> {
let node_config = NodeConfig::load()?;
let bind_addr = node_config.bind_addr.unwrap_or(SocketAddr::new(
IpAddr::V6(Ipv6Addr::UNSPECIFIED),
DEFAULT_PORT,
));
let listener = TcpListener::bind(bind_addr)?;
println!("[info] <{}> Listening", bind_addr);
for stream in listener.incoming() {
let stream = stream?;
let peer_addr = stream.peer_addr()?;
thread::spawn(move || match handle_client(stream) {
Ok(_) => println!("[info] <{}> Disconnected", peer_addr),
Err(e) => eprintln!("[warn] <{}> Cannot handle client: {}", peer_addr, e),
});
}
unreachable!()
}
fn handle_client(stream: TcpStream) -> Result<(), NetworkError> {
let peer_addr = stream.peer_addr()?;
let local_node = LocalNode::new()?;
let auth_serv = AuthServ::try_from(stream)?;
let (stream_conn, remote_node_auth) =
auth_serv.secure_stream(local_node.config().auth.clone())?;
println!(
"[info] <{}@{}> Authentication successful",
remote_node_auth.node_name, peer_addr
);
let mut local_sync_info = SyncInfo {
volumes: HashMap::new(),
};
for volume in &remote_node_auth.push {
let latest_snapshots = local_node.latest_snapshots(volume.clone())?;
local_sync_info
.volumes
.insert(volume.clone(), latest_snapshots);
}
let (stream_conn, remote_sync_info) = stream_conn.meta_sync(local_sync_info)?;
let mut tx = Vec::new();
for (volume, latest_snapshots) in remote_sync_info.volumes.into_iter().filter(|(volume, _)| {
remote_node_auth.pull.contains(volume) || volume.node_name() == remote_node_auth.node_name
}) {
// Full backup: Either restoring or remote is out of date.
if volume.node_name() == remote_node_auth.node_name {
let snapshot = local_node.latest_backup_full(volume.clone())?;
let r = local_node.export(&snapshot)?;
tx.push((r, snapshot));
} else {
for snapshot in local_node.all_full_after(volume.clone(), latest_snapshots.last_full)? {
let r = local_node.export(&snapshot)?;
tx.push((r, snapshot));
}
}
// Incremental backup: Either restoring or remote is out of date.
let incr = if volume.node_name() == remote_node_auth.node_name {
local_node.backup_incremental_after(
volume.clone(),
local_node.latest_backup_full(volume)?.taken(),
)?
} else {
local_node.all_incremental_after(volume, latest_snapshots.last_incremental)?
};
for snapshot in incr {
let r = local_node.export(&snapshot)?;
tx.push((r, snapshot));
}
}
for (_, snapshot) in &tx {
println!(
"[info] <{}@{}> Queueing {} for transmission",
remote_node_auth.node_name, peer_addr, snapshot
);
}
let rx_setup =
|snapshot: &Snapshot| {
if !remote_node_auth.push.iter().any(|volume| {
snapshot.is_of_volume(volume) && volume.node_name() != local_node.name()
}) {
return Err(RemoteError::AccessDenied);
}
if snapshot.backup_path().exists() {
return Err(RemoteError::Immutable);
}
let file = File::create(snapshot.streaming_path()).map_err(|_| RemoteError::RxError)?;
println!(
"[info] <{}@{}> Receiving {}",
remote_node_auth.node_name, peer_addr, snapshot
);
Ok(file)
};
let rx_finish = |snapshot: Snapshot| {
fs::rename(snapshot.streaming_path(), snapshot.backup_path())
.map_err(|_| RemoteError::RxError)?;
println!(
"[info] <{}@{}> Received {}",
remote_node_auth.node_name, peer_addr, snapshot
);
Ok(())
};
stream_conn.data_sync(tx, rx_setup, rx_finish)
}
|
