openethereum/parity/snapshot.rs

272 lines
8.7 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Snapshot and restoration commands.
use std::time::Duration;
use std::path::{Path, PathBuf};
use std::sync::Arc;
use ethcore::snapshot::{Progress, RestorationStatus, SnapshotService as SS};
use ethcore::snapshot::io::{SnapshotReader, PackedReader, PackedWriter};
use ethcore::snapshot::service::Service as SnapshotService;
use ethcore::service::ClientService;
use ethcore::client::{Mode, DatabaseCompactionProfile, VMType};
use ethcore::miner::Miner;
use ethcore::ids::BlockId;
use cache::CacheConfig;
use params::{SpecType, Pruning, Switch, tracing_switch_to_bool, fatdb_switch_to_bool};
use helpers::{to_client_config, execute_upgrades};
use dir::Directories;
use user_defaults::UserDefaults;
use fdlimit;
use io::PanicHandler;
/// Kinds of snapshot commands.
#[derive(Debug, PartialEq, Clone, Copy)]
pub enum Kind {
/// Take a snapshot.
Take,
/// Restore a snapshot.
Restore
}
/// Command for snapshot creation or restoration.
#[derive(Debug, PartialEq)]
pub struct SnapshotCommand {
pub cache_config: CacheConfig,
pub dirs: Directories,
pub spec: SpecType,
pub pruning: Pruning,
pub pruning_history: u64,
pub tracing: Switch,
pub fat_db: Switch,
pub compaction: DatabaseCompactionProfile,
pub file_path: Option<String>,
pub wal: bool,
pub kind: Kind,
pub block_at: BlockId,
}
// helper for reading chunks from arbitrary reader and feeding them into the
// service.
fn restore_using<R: SnapshotReader>(snapshot: Arc<SnapshotService>, reader: &R, recover: bool) -> Result<(), String> {
use util::sha3::Hashable;
let manifest = reader.manifest();
info!("Restoring to block #{} (0x{:?})", manifest.block_number, manifest.block_hash);
try!(snapshot.init_restore(manifest.clone(), recover).map_err(|e| {
format!("Failed to begin restoration: {}", e)
}));
let (num_state, num_blocks) = (manifest.state_hashes.len(), manifest.block_hashes.len());
let informant_handle = snapshot.clone();
::std::thread::spawn(move || {
while let RestorationStatus::Ongoing { state_chunks_done, block_chunks_done, .. } = informant_handle.status() {
info!("Processed {}/{} state chunks and {}/{} block chunks.",
state_chunks_done, num_state, block_chunks_done, num_blocks);
::std::thread::sleep(Duration::from_secs(5));
}
});
info!("Restoring state");
for &state_hash in &manifest.state_hashes {
if snapshot.status() == RestorationStatus::Failed {
return Err("Restoration failed".into());
}
let chunk = try!(reader.chunk(state_hash)
.map_err(|e| format!("Encountered error while reading chunk {:?}: {}", state_hash, e)));
let hash = chunk.sha3();
if hash != state_hash {
return Err(format!("Mismatched chunk hash. Expected {:?}, got {:?}", state_hash, hash));
}
snapshot.feed_state_chunk(state_hash, &chunk);
}
info!("Restoring blocks");
for &block_hash in &manifest.block_hashes {
if snapshot.status() == RestorationStatus::Failed {
return Err("Restoration failed".into());
}
let chunk = try!(reader.chunk(block_hash)
.map_err(|e| format!("Encountered error while reading chunk {:?}: {}", block_hash, e)));
let hash = chunk.sha3();
if hash != block_hash {
return Err(format!("Mismatched chunk hash. Expected {:?}, got {:?}", block_hash, hash));
}
snapshot.feed_block_chunk(block_hash, &chunk);
}
match snapshot.status() {
RestorationStatus::Ongoing { .. } => Err("Snapshot file is incomplete and missing chunks.".into()),
RestorationStatus::Failed => Err("Snapshot restoration failed.".into()),
RestorationStatus::Inactive => {
info!("Restoration complete.");
Ok(())
}
}
}
impl SnapshotCommand {
// shared portion of snapshot commands: start the client service
fn start_service(self) -> Result<(ClientService, Arc<PanicHandler>), String> {
// Setup panic handler
let panic_handler = PanicHandler::new_in_arc();
// load spec file
let spec = try!(self.spec.spec());
// load genesis hash
let genesis_hash = spec.genesis_header().hash();
// database paths
let db_dirs = self.dirs.database(genesis_hash, spec.fork_name.clone());
// user defaults path
let user_defaults_path = db_dirs.user_defaults_path();
// load user defaults
let user_defaults = try!(UserDefaults::load(&user_defaults_path));
fdlimit::raise_fd_limit();
// select pruning algorithm
let algorithm = self.pruning.to_algorithm(&user_defaults);
// check if tracing is on
let tracing = try!(tracing_switch_to_bool(self.tracing, &user_defaults));
// check if fatdb is on
let fat_db = try!(fatdb_switch_to_bool(self.fat_db, &user_defaults, algorithm));
// prepare client and snapshot paths.
let client_path = db_dirs.client_path(algorithm);
let snapshot_path = db_dirs.snapshot_path();
// execute upgrades
try!(execute_upgrades(&db_dirs, algorithm, self.compaction.compaction_profile(db_dirs.fork_path().as_path())));
// prepare client config
let client_config = to_client_config(&self.cache_config, Default::default(), Mode::Active, tracing, fat_db, self.compaction, self.wal, VMType::default(), "".into(), algorithm, self.pruning_history, true);
let service = try!(ClientService::start(
client_config,
&spec,
&client_path,
&snapshot_path,
&self.dirs.ipc_path(),
Arc::new(Miner::with_spec(&spec))
).map_err(|e| format!("Client service error: {:?}", e)));
Ok((service, panic_handler))
}
/// restore from a snapshot
pub fn restore(self) -> Result<(), String> {
let file = self.file_path.clone();
let (service, _panic_handler) = try!(self.start_service());
warn!("Snapshot restoration is experimental and the format may be subject to change.");
warn!("On encountering an unexpected error, please ensure that you have a recent snapshot.");
let snapshot = service.snapshot_service();
if let Some(file) = file {
info!("Attempting to restore from snapshot at '{}'", file);
let reader = PackedReader::new(Path::new(&file))
.map_err(|e| format!("Couldn't open snapshot file: {}", e))
.and_then(|x| x.ok_or("Snapshot file has invalid format.".into()));
let reader = try!(reader);
try!(restore_using(snapshot, &reader, true));
} else {
info!("Attempting to restore from local snapshot.");
// attempting restoration with recovery will lead to deadlock
// as we currently hold a read lock on the service's reader.
match *snapshot.reader() {
Some(ref reader) => try!(restore_using(snapshot.clone(), reader, false)),
None => return Err("No local snapshot found.".into()),
}
}
Ok(())
}
/// Take a snapshot from the head of the chain.
pub fn take_snapshot(self) -> Result<(), String> {
let file_path = try!(self.file_path.clone().ok_or("No file path provided.".to_owned()));
let file_path: PathBuf = file_path.into();
let block_at = self.block_at;
let (service, _panic_handler) = try!(self.start_service());
warn!("Snapshots are currently experimental. File formats may be subject to change.");
let writer = try!(PackedWriter::new(&file_path)
.map_err(|e| format!("Failed to open snapshot writer: {}", e)));
let progress = Arc::new(Progress::default());
let p = progress.clone();
let informant_handle = ::std::thread::spawn(move || {
::std::thread::sleep(Duration::from_secs(5));
let mut last_size = 0;
while !p.done() {
let cur_size = p.size();
if cur_size != last_size {
last_size = cur_size;
let bytes = ::informant::format_bytes(p.size());
info!("Snapshot: {} accounts {} blocks {}", p.accounts(), p.blocks(), bytes);
}
::std::thread::sleep(Duration::from_secs(5));
}
});
if let Err(e) = service.client().take_snapshot(writer, block_at, &*progress) {
let _ = ::std::fs::remove_file(&file_path);
return Err(format!("Encountered fatal error while creating snapshot: {}", e));
}
info!("snapshot creation complete");
assert!(progress.done());
try!(informant_handle.join().map_err(|_| "failed to join logger thread"));
Ok(())
}
}
/// Execute this snapshot command.
pub fn execute(cmd: SnapshotCommand) -> Result<String, String> {
match cmd.kind {
Kind::Take => try!(cmd.take_snapshot()),
Kind::Restore => try!(cmd.restore()),
}
Ok(String::new())
}