user defaults (#2014)

* user defaults

* finished user defaults

* user defaults are network-dependent

* added tests for newly added functions, logger is initialized first

* dir cleanup in progress

* user_file is placed next to snapshots

parity/blockchain.rs

@@ -26,15 +26,16 @@ use io::{PanicHandler, ForwardPanic};
 use util::{ToPretty, Uint};
 use rlp::PayloadInfo;
 use ethcore::service::ClientService;
-use ethcore::client::{Mode, DatabaseCompactionProfile, Switch, VMType, BlockImportError, BlockChainClient, BlockID};
+use ethcore::client::{Mode, DatabaseCompactionProfile, VMType, BlockImportError, BlockChainClient, BlockID};
 use ethcore::error::ImportError;
 use ethcore::miner::Miner;
 use cache::CacheConfig;
+use params::{SpecType, Pruning, Switch, tracing_switch_to_bool};
 use informant::{Informant, MillisecondDuration};
 use io_handler::ImportIoHandler;
-use params::{SpecType, Pruning};
 use helpers::{to_client_config, execute_upgrades};
 use dir::Directories;
+use user_defaults::UserDefaults;
 use fdlimit;
 
 #[derive(Debug, PartialEq)]
@@ -113,29 +114,44 @@ fn execute_import(cmd: ImportBlockchain) -> Result<String, String> {
 	// Setup panic handler
 	let panic_handler = PanicHandler::new_in_arc();
 
+	// Setup logging
+	let _logger = setup_log(&cmd.logger_config);
+
+	// create dirs used by parity
+	try!(cmd.dirs.create_dirs());
+
 	// load spec file
 	let spec = try!(cmd.spec.spec());
 
 	// load genesis hash
 	let genesis_hash = spec.genesis_header().hash();
 
-	// Setup logging
-	let _logger = setup_log(&cmd.logger_config);
+	// database paths
+	let db_dirs = cmd.dirs.database(genesis_hash, spec.fork_name.clone());
+
+	// user defaults path
+	let user_defaults_path = db_dirs.user_defaults_path();
+
+	// load user defaults
+	let mut user_defaults = try!(UserDefaults::load(&user_defaults_path));
+
+	// check if tracing is on
+	let tracing = try!(tracing_switch_to_bool(cmd.tracing, &user_defaults));
 
 	fdlimit::raise_fd_limit();
 
 	// select pruning algorithm
-	let algorithm = cmd.pruning.to_algorithm(&cmd.dirs, genesis_hash, spec.fork_name.as_ref());
+	let algorithm = cmd.pruning.to_algorithm(&user_defaults);
 
 	// prepare client and snapshot paths.
-	let client_path = cmd.dirs.client_path(genesis_hash, spec.fork_name.as_ref(), algorithm);
-	let snapshot_path = cmd.dirs.snapshot_path(genesis_hash, spec.fork_name.as_ref());
+	let client_path = db_dirs.client_path(algorithm);
+	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&cmd.dirs, genesis_hash, spec.fork_name.as_ref(), algorithm, cmd.compaction.compaction_profile()));
+	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile()));
 
 	// prepare client config
-	let client_config = to_client_config(&cmd.cache_config, &cmd.dirs, genesis_hash, cmd.mode, cmd.tracing, cmd.pruning, cmd.compaction, cmd.wal, cmd.vm_type, "".into(), spec.fork_name.as_ref());
+	let client_config = to_client_config(&cmd.cache_config, cmd.mode, tracing, cmd.compaction, cmd.wal, cmd.vm_type, "".into(), algorithm);
 
 	// build client
 	let service = try!(ClientService::start(
@@ -220,6 +236,12 @@ fn execute_import(cmd: ImportBlockchain) -> Result<String, String> {
 		}
 	}
 	client.flush_queue();
+
+	// save user defaults
+	user_defaults.pruning = algorithm;
+	user_defaults.tracing = tracing;
+	try!(user_defaults.save(&user_defaults_path));
+
 	let report = client.report();
 
 	let ms = timer.elapsed().as_milliseconds();
@@ -238,6 +260,12 @@ fn execute_export(cmd: ExportBlockchain) -> Result<String, String> {
 	// Setup panic handler
 	let panic_handler = PanicHandler::new_in_arc();
 
+	// Setup logging
+	let _logger = setup_log(&cmd.logger_config);
+
+	// create dirs used by parity
+	try!(cmd.dirs.create_dirs());
+
 	let format = cmd.format.unwrap_or_default();
 
 	// load spec file
@@ -246,23 +274,32 @@ fn execute_export(cmd: ExportBlockchain) -> Result<String, String> {
 	// load genesis hash
 	let genesis_hash = spec.genesis_header().hash();
 
-	// Setup logging
-	let _logger = setup_log(&cmd.logger_config);
+	// database paths
+	let db_dirs = cmd.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));
+
+	// check if tracing is on
+	let tracing = try!(tracing_switch_to_bool(cmd.tracing, &user_defaults));
 
 	fdlimit::raise_fd_limit();
 
 	// select pruning algorithm
-	let algorithm = cmd.pruning.to_algorithm(&cmd.dirs, genesis_hash, spec.fork_name.as_ref());
+	let algorithm = cmd.pruning.to_algorithm(&user_defaults);
 
 	// prepare client and snapshot paths.
-	let client_path = cmd.dirs.client_path(genesis_hash, spec.fork_name.as_ref(), algorithm);
-	let snapshot_path = cmd.dirs.snapshot_path(genesis_hash, spec.fork_name.as_ref());
+	let client_path = db_dirs.client_path(algorithm);
+	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&cmd.dirs, genesis_hash, spec.fork_name.as_ref(), algorithm, cmd.compaction.compaction_profile()));
+	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile()));
 
 	// prepare client config
-	let client_config = to_client_config(&cmd.cache_config, &cmd.dirs, genesis_hash, cmd.mode, cmd.tracing, cmd.pruning, cmd.compaction, cmd.wal, VMType::default(), "".into(), spec.fork_name.as_ref());
+	let client_config = to_client_config(&cmd.cache_config, cmd.mode, tracing, cmd.compaction, cmd.wal, VMType::default(), "".into(), algorithm);
 
 	let service = try!(ClientService::start(
 		client_config,

parity/dir.rs

@@ -52,32 +52,13 @@ impl Directories {
 		Ok(())
 	}
 
-	/// Get the chain's root path.
-	pub fn chain_path(&self, genesis_hash: H256, fork_name: Option<&String>) -> PathBuf {
-		let mut dir = Path::new(&self.db).to_path_buf();
-		dir.push(format!("{:?}{}", H64::from(genesis_hash), fork_name.map(|f| format!("-{}", f)).unwrap_or_default()));
-		dir
-	}
-
-	/// Get the root path for database
-	pub fn db_version_path(&self, genesis_hash: H256, fork_name: Option<&String>, pruning: Algorithm) -> PathBuf {
-		let mut dir = self.chain_path(genesis_hash, fork_name);
-		dir.push(format!("v{}-sec-{}", LEGACY_CLIENT_DB_VER_STR, pruning.as_internal_name_str()));
-		dir
-	}
-
-	/// Get the path for the databases given the genesis_hash and information on the databases.
-	pub fn client_path(&self, genesis_hash: H256, fork_name: Option<&String>, pruning: Algorithm) -> PathBuf {
-		let mut dir = self.db_version_path(genesis_hash, fork_name, pruning);
-		dir.push("db");
-		dir
-	}
-
-	/// Get the path for the snapshot directory given the genesis hash and fork name.
-	pub fn snapshot_path(&self, genesis_hash: H256, fork_name: Option<&String>) -> PathBuf {
-		let mut dir = self.chain_path(genesis_hash, fork_name);
-		dir.push("snapshot");
-		dir
+	/// Database paths.
+	pub fn database(&self, genesis_hash: H256, fork_name: Option<String>) -> DatabaseDirectories {
+		DatabaseDirectories {
+			path: self.db.clone(),
+			genesis_hash: genesis_hash,
+			fork_name: fork_name,
+		}
 	}
 
 	/// Get the ipc sockets path
@@ -88,6 +69,49 @@ impl Directories {
 	}
 }
 
+#[derive(Debug, PartialEq)]
+pub struct DatabaseDirectories {
+	pub path: String,
+	pub genesis_hash: H256,
+	pub fork_name: Option<String>,
+}
+
+impl DatabaseDirectories {
+	fn fork_path(&self) -> PathBuf {
+		let mut dir = Path::new(&self.path).to_path_buf();
+		dir.push(format!("{:?}{}", H64::from(self.genesis_hash), self.fork_name.as_ref().map(|f| format!("-{}", f)).unwrap_or_default()));
+		dir
+	}
+
+	/// Get the root path for database
+	pub fn version_path(&self, pruning: Algorithm) -> PathBuf {
+		let mut dir = self.fork_path();
+		dir.push(format!("v{}-sec-{}", LEGACY_CLIENT_DB_VER_STR, pruning.as_internal_name_str()));
+		dir
+	}
+
+	/// Get the path for the databases given the genesis_hash and information on the databases.
+	pub fn client_path(&self, pruning: Algorithm) -> PathBuf {
+		let mut dir = self.version_path(pruning);
+		dir.push("db");
+		dir
+	}
+
+	/// Get user defaults path
+	pub fn user_defaults_path(&self) -> PathBuf {
+		let mut dir = self.fork_path();
+		dir.push("user_defaults");
+		dir
+	}
+
+	/// Get the path for the snapshot directory given the genesis hash and fork name.
+	pub fn snapshot_path(&self) -> PathBuf {
+		let mut dir = self.fork_path();
+		dir.push("snapshot");
+		dir
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use super::Directories;

parity/helpers.rs

@@ -19,13 +19,12 @@ use std::io::{Write, Read, BufReader, BufRead};
 use std::time::Duration;
 use std::path::Path;
 use std::fs::File;
-use util::{clean_0x, U256, Uint, Address, path, H256, CompactionProfile};
+use util::{clean_0x, U256, Uint, Address, path, CompactionProfile};
 use util::journaldb::Algorithm;
-use ethcore::client::{Mode, BlockID, Switch, VMType, DatabaseCompactionProfile, ClientConfig};
+use ethcore::client::{Mode, BlockID, VMType, DatabaseCompactionProfile, ClientConfig};
 use ethcore::miner::PendingSet;
 use cache::CacheConfig;
-use dir::Directories;
-use params::Pruning;
+use dir::DatabaseDirectories;
 use upgrade::upgrade;
 use migration::migrate;
 use ethsync::is_valid_node_url;
@@ -190,16 +189,13 @@ pub fn default_network_config() -> ::ethsync::NetworkConfiguration {
 #[cfg_attr(feature = "dev", allow(too_many_arguments))]
 pub fn to_client_config(
 		cache_config: &CacheConfig,
-		dirs: &Directories,
-		genesis_hash: H256,
 		mode: Mode,
-		tracing: Switch,
-		pruning: Pruning,
+		tracing: bool,
 		compaction: DatabaseCompactionProfile,
 		wal: bool,
 		vm_type: VMType,
 		name: String,
-		fork_name: Option<&String>,
+		pruning: Algorithm,
 	) -> ClientConfig {
 	let mut client_config = ClientConfig::default();
 
@@ -221,7 +217,7 @@ pub fn to_client_config(
 
 	client_config.mode = mode;
 	client_config.tracing.enabled = tracing;
-	client_config.pruning = pruning.to_algorithm(dirs, genesis_hash, fork_name);
+	client_config.pruning = pruning;
 	client_config.db_compaction = compaction;
 	client_config.db_wal = wal;
 	client_config.vm_type = vm_type;
@@ -230,14 +226,12 @@ pub fn to_client_config(
 }
 
 pub fn execute_upgrades(
-	dirs: &Directories,
-	genesis_hash: H256,
-	fork_name: Option<&String>,
+	dirs: &DatabaseDirectories,
 	pruning: Algorithm,
 	compaction_profile: CompactionProfile
 ) -> Result<(), String> {
 
-	match upgrade(Some(&dirs.db)) {
+	match upgrade(Some(&dirs.path)) {
 		Ok(upgrades_applied) if upgrades_applied > 0 => {
 			debug!("Executed {} upgrade scripts - ok", upgrades_applied);
 		},
@@ -247,7 +241,7 @@ pub fn execute_upgrades(
 		_ => {},
 	}
 
-	let client_path = dirs.db_version_path(genesis_hash, fork_name, pruning);
+	let client_path = dirs.version_path(pruning);
 	migrate(&client_path, pruning, compaction_profile).map_err(|e| format!("{}", e))
 }
 

parity/main.rs

@@ -39,6 +39,8 @@ extern crate semver;
 extern crate ethcore_io as io;
 extern crate ethcore_ipc as ipc;
 extern crate ethcore_ipc_nano as nanoipc;
+extern crate serde;
+extern crate serde_json;
 extern crate rlp;
 
 extern crate json_ipc_server as jsonipc;
@@ -106,6 +108,7 @@ mod run;
 mod sync;
 #[cfg(feature="ipc")]
 mod boot;
+mod user_defaults;
 
 #[cfg(feature="stratum")]
 mod stratum;

parity/params.rs

@@ -14,15 +14,14 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::str::FromStr;
-use std::fs;
+use std::{str, fs};
 use std::time::Duration;
-use util::{H256, Address, U256, version_data};
+use util::{Address, U256, version_data};
 use util::journaldb::Algorithm;
 use ethcore::spec::Spec;
 use ethcore::ethereum;
 use ethcore::miner::{GasPricer, GasPriceCalibratorOptions};
-use dir::Directories;
+use user_defaults::UserDefaults;
 
 #[derive(Debug, PartialEq)]
 pub enum SpecType {
@@ -39,7 +38,7 @@ impl Default for SpecType {
 	}
 }
 
-impl FromStr for SpecType {
+impl str::FromStr for SpecType {
 	type Err = String;
 
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
@@ -81,7 +80,7 @@ impl Default for Pruning {
 	}
 }
 
-impl FromStr for Pruning {
+impl str::FromStr for Pruning {
 	type Err = String;
 
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
@@ -93,24 +92,12 @@ impl FromStr for Pruning {
 }
 
 impl Pruning {
-	pub fn to_algorithm(&self, dirs: &Directories, genesis_hash: H256, fork_name: Option<&String>) -> Algorithm {
+	pub fn to_algorithm(&self, user_defaults: &UserDefaults) -> Algorithm {
 		match *self {
 			Pruning::Specific(algo) => algo,
-			Pruning::Auto => Self::find_best_db(dirs, genesis_hash, fork_name),
+			Pruning::Auto => user_defaults.pruning,
 		}
 	}
-
-	fn find_best_db(dirs: &Directories, genesis_hash: H256, fork_name: Option<&String>) -> Algorithm {
-		let mut algo_types = Algorithm::all_types();
-		// if all dbs have the same modification time, the last element is the default one
-		algo_types.push(Algorithm::default());
-
-		algo_types.into_iter().max_by_key(|i| {
-			let mut client_path = dirs.client_path(genesis_hash, fork_name, *i);
-			client_path.push("CURRENT");
-			fs::metadata(&client_path).and_then(|m| m.modified()).ok()
-		}).unwrap()
-	}
 }
 
 #[derive(Debug, PartialEq)]
@@ -128,7 +115,7 @@ impl Default for ResealPolicy {
 	}
 }
 
-impl FromStr for ResealPolicy {
+impl str::FromStr for ResealPolicy {
 	type Err = String;
 
 	fn from_str(s: &str) -> Result<Self, Self::Err> {
@@ -223,10 +210,50 @@ impl Default for MinerExtras {
 	}
 }
 
+/// 3-value enum.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Switch {
+	/// True.
+	On,
+	/// False.
+	Off,
+	/// Auto.
+	Auto,
+}
+
+impl Default for Switch {
+	fn default() -> Self {
+		Switch::Auto
+	}
+}
+
+impl str::FromStr for Switch {
+	type Err = String;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		match s {
+			"on" => Ok(Switch::On),
+			"off" => Ok(Switch::Off),
+			"auto" => Ok(Switch::Auto),
+			other => Err(format!("Invalid switch value: {}", other))
+		}
+	}
+}
+
+pub fn tracing_switch_to_bool(switch: Switch, user_defaults: &UserDefaults) -> Result<bool, String> {
+	match (user_defaults.is_first_launch, switch, user_defaults.tracing) {
+		(false, Switch::On, false) => Err("TraceDB resync required".into()),
+		(_, Switch::On, _) => Ok(true),
+		(_, Switch::Off, _) => Ok(false),
+		(_, Switch::Auto, def) => Ok(def),
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use util::journaldb::Algorithm;
-	use super::{SpecType, Pruning, ResealPolicy};
+	use user_defaults::UserDefaults;
+	use super::{SpecType, Pruning, ResealPolicy, Switch, tracing_switch_to_bool};
 
 	#[test]
 	fn test_spec_type_parsing() {
@@ -274,4 +301,36 @@ mod tests {
 		let all = ResealPolicy { own: true, external: true };
 		assert_eq!(all, ResealPolicy::default());
 	}
+
+	#[test]
+	fn test_switch_parsing() {
+		assert_eq!(Switch::On, "on".parse().unwrap());
+		assert_eq!(Switch::Off, "off".parse().unwrap());
+		assert_eq!(Switch::Auto, "auto".parse().unwrap());
+	}
+
+	#[test]
+	fn test_switch_default() {
+		assert_eq!(Switch::default(), Switch::Auto);
+	}
+
+	fn user_defaults_with_tracing(first_launch: bool, tracing: bool) -> UserDefaults {
+		let mut ud = UserDefaults::default();
+		ud.is_first_launch = first_launch;
+		ud.tracing = tracing;
+		ud
+	}
+
+	#[test]
+	fn test_switch_to_bool() {
+		assert!(!tracing_switch_to_bool(Switch::Off, &user_defaults_with_tracing(true, true)).unwrap());
+		assert!(!tracing_switch_to_bool(Switch::Off, &user_defaults_with_tracing(true, false)).unwrap());
+		assert!(!tracing_switch_to_bool(Switch::Off, &user_defaults_with_tracing(false, true)).unwrap());
+		assert!(!tracing_switch_to_bool(Switch::Off, &user_defaults_with_tracing(false, false)).unwrap());
+
+		assert!(tracing_switch_to_bool(Switch::On, &user_defaults_with_tracing(true, true)).unwrap());
+		assert!(tracing_switch_to_bool(Switch::On, &user_defaults_with_tracing(true, false)).unwrap());
+		assert!(tracing_switch_to_bool(Switch::On, &user_defaults_with_tracing(false, true)).unwrap());
+		assert!(tracing_switch_to_bool(Switch::On, &user_defaults_with_tracing(false, false)).is_err());
+	}
 }

parity/run.rs

@@ -23,7 +23,7 @@ use ethcore_rpc::NetworkSettings;
 use ethsync::NetworkConfiguration;
 use util::{Colour, version, U256};
 use io::{MayPanic, ForwardPanic, PanicHandler};
-use ethcore::client::{Mode, Switch, DatabaseCompactionProfile, VMType, ChainNotify};
+use ethcore::client::{Mode, DatabaseCompactionProfile, VMType, ChainNotify};
 use ethcore::service::ClientService;
 use ethcore::account_provider::AccountProvider;
 use ethcore::miner::{Miner, MinerService, ExternalMiner, MinerOptions};
@@ -35,10 +35,11 @@ use rpc::{HttpServer, IpcServer, HttpConfiguration, IpcConfiguration};
 use signer::SignerServer;
 use dapps::WebappServer;
 use io_handler::ClientIoHandler;
-use params::{SpecType, Pruning, AccountsConfig, GasPricerConfig, MinerExtras};
+use params::{SpecType, Pruning, AccountsConfig, GasPricerConfig, MinerExtras, Switch, tracing_switch_to_bool};
 use helpers::{to_client_config, execute_upgrades, passwords_from_files};
 use dir::Directories;
 use cache::CacheConfig;
+use user_defaults::UserDefaults;
 use dapps;
 use signer;
 use modules;
@@ -87,34 +88,45 @@ pub struct RunCmd {
 }
 
 pub fn execute(cmd: RunCmd) -> Result<(), String> {
-	// increase max number of open files
-	raise_fd_limit();
+	// set up panic handler
+	let panic_handler = PanicHandler::new_in_arc();
 
 	// set up logger
 	let logger = try!(setup_log(&cmd.logger_config));
 
-	// set up panic handler
-	let panic_handler = PanicHandler::new_in_arc();
+	// increase max number of open files
+	raise_fd_limit();
 
 	// create dirs used by parity
 	try!(cmd.dirs.create_dirs());
 
 	// load spec
 	let spec = try!(cmd.spec.spec());
-	let fork_name = spec.fork_name.clone();
 
 	// load genesis hash
 	let genesis_hash = spec.genesis_header().hash();
 
+	// database paths
+	let db_dirs = cmd.dirs.database(genesis_hash, spec.fork_name.clone());
+
+	// user defaults path
+	let user_defaults_path = db_dirs.user_defaults_path();
+
+	// load user defaults
+	let mut user_defaults = try!(UserDefaults::load(&user_defaults_path));
+
+	// check if tracing is on
+	let tracing = try!(tracing_switch_to_bool(cmd.tracing, &user_defaults));
+
 	// select pruning algorithm
-	let algorithm = cmd.pruning.to_algorithm(&cmd.dirs, genesis_hash, fork_name.as_ref());
+	let algorithm = cmd.pruning.to_algorithm(&user_defaults);
 
 	// prepare client and snapshot paths.
-	let client_path = cmd.dirs.client_path(genesis_hash, fork_name.as_ref(), algorithm);
-	let snapshot_path = cmd.dirs.snapshot_path(genesis_hash, fork_name.as_ref());
+	let client_path = db_dirs.client_path(algorithm);
+	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&cmd.dirs, genesis_hash, fork_name.as_ref(), algorithm, cmd.compaction.compaction_profile()));
+	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile()));
 
 	// run in daemon mode
 	if let Some(pid_file) = cmd.daemon {
@@ -152,16 +164,13 @@ pub fn execute(cmd: RunCmd) -> Result<(), String> {
 	// create client config
 	let client_config = to_client_config(
 		&cmd.cache_config,
-		&cmd.dirs,
-		genesis_hash,
 		cmd.mode,
-		cmd.tracing,
-		cmd.pruning,
+		tracing,
 		cmd.compaction,
 		cmd.wal,
 		cmd.vm_type,
 		cmd.name,
-		fork_name.as_ref(),
+		algorithm,
 	);
 
 	// set up bootnodes
@@ -288,6 +297,11 @@ pub fn execute(cmd: RunCmd) -> Result<(), String> {
 		url::open(&format!("http://{}:{}/", cmd.dapps_conf.interface, cmd.dapps_conf.port));
 	}
 
+	// save user defaults
+	user_defaults.pruning = algorithm;
+	user_defaults.tracing = tracing;
+	try!(user_defaults.save(&user_defaults_path));
+
 	// Handle exit
 	wait_for_exit(panic_handler, http_server, ipc_server, dapps_server, signer_server);
 

parity/snapshot.rs

@@ -25,14 +25,15 @@ 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, Switch, VMType};
+use ethcore::client::{Mode, DatabaseCompactionProfile, VMType};
 use ethcore::miner::Miner;
 use ethcore::ids::BlockID;
 
 use cache::CacheConfig;
-use params::{SpecType, Pruning};
+use params::{SpecType, Pruning, Switch, tracing_switch_to_bool};
 use helpers::{to_client_config, execute_upgrades};
 use dir::Directories;
+use user_defaults::UserDefaults;
 use fdlimit;
 
 use io::PanicHandler;
@@ -129,23 +130,35 @@ impl SnapshotCommand {
 		// 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));
+
+		// check if tracing is on
+		let tracing = try!(tracing_switch_to_bool(self.tracing, &user_defaults));
+
 		// Setup logging
 		let _logger = setup_log(&self.logger_config);
 
 		fdlimit::raise_fd_limit();
 
 		// select pruning algorithm
-		let algorithm = self.pruning.to_algorithm(&self.dirs, genesis_hash, spec.fork_name.as_ref());
+		let algorithm = self.pruning.to_algorithm(&user_defaults);
 
 		// prepare client and snapshot paths.
-		let client_path = self.dirs.client_path(genesis_hash, spec.fork_name.as_ref(), algorithm);
-		let snapshot_path = self.dirs.snapshot_path(genesis_hash, spec.fork_name.as_ref());
+		let client_path = db_dirs.client_path(algorithm);
+		let snapshot_path = db_dirs.snapshot_path();
 
 		// execute upgrades
-		try!(execute_upgrades(&self.dirs, genesis_hash, spec.fork_name.as_ref(), algorithm, self.compaction.compaction_profile()));
+		try!(execute_upgrades(&db_dirs, algorithm, self.compaction.compaction_profile()));
 
 		// prepare client config
-		let client_config = to_client_config(&self.cache_config, &self.dirs, genesis_hash, self.mode, self.tracing, self.pruning, self.compaction, self.wal, VMType::default(), "".into(), spec.fork_name.as_ref());
+		let client_config = to_client_config(&self.cache_config, self.mode, tracing, self.compaction, self.wal, VMType::default(), "".into(), algorithm);
 
 		let service = try!(ClientService::start(
 			client_config,

parity/user_defaults.rs

@@ -0,0 +1,98 @@
+// 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/>.
+
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::collections::BTreeMap;
+use serde::{Serialize, Serializer, Error, Deserialize, Deserializer};
+use serde::de::{Visitor, MapVisitor};
+use serde::de::impls::BTreeMapVisitor;
+use serde_json::Value;
+use serde_json::de::from_reader;
+use serde_json::ser::to_string;
+use util::journaldb::Algorithm;
+
+pub struct UserDefaults {
+	pub is_first_launch: bool,
+	pub pruning: Algorithm,
+	pub tracing: bool,
+}
+
+impl Serialize for UserDefaults {
+	fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+	where S: Serializer {
+		let mut map: BTreeMap<String, Value> = BTreeMap::new();
+		map.insert("pruning".into(), Value::String(self.pruning.as_str().into()));
+		map.insert("tracing".into(), Value::Bool(self.tracing));
+		map.serialize(serializer)
+	}
+}
+
+struct UserDefaultsVisitor;
+
+impl Deserialize for UserDefaults {
+	fn deserialize<D>(deserializer: &mut D) -> Result<Self, D::Error>
+	where D: Deserializer {
+		deserializer.deserialize(UserDefaultsVisitor)
+	}
+}
+
+impl Visitor for UserDefaultsVisitor {
+	type Value = UserDefaults;
+
+	fn visit_map<V>(&mut self, visitor: V) -> Result<Self::Value, V::Error>
+	where V: MapVisitor {
+		let mut map: BTreeMap<String, Value> = try!(BTreeMapVisitor::new().visit_map(visitor));
+		let pruning: Value = try!(map.remove("pruning".into()).ok_or_else(|| Error::custom("missing pruning")));
+		let pruning = try!(pruning.as_str().ok_or_else(|| Error::custom("invalid pruning value")));
+		let pruning = try!(pruning.parse().map_err(|_| Error::custom("invalid pruning method")));
+		let tracing: Value = try!(map.remove("tracing".into()).ok_or_else(|| Error::custom("missing tracing")));
+		let tracing = try!(tracing.as_bool().ok_or_else(|| Error::custom("invalid tracing value")));
+
+		let user_defaults = UserDefaults {
+			is_first_launch: false,
+			pruning: pruning,
+			tracing: tracing,
+		};
+
+		Ok(user_defaults)
+	}
+}
+
+impl Default for UserDefaults {
+	fn default() -> Self {
+		UserDefaults {
+			is_first_launch: true,
+			pruning: Algorithm::default(),
+			tracing: false,
+		}
+	}
+}
+
+impl UserDefaults {
+	pub fn load<P>(path: P) -> Result<Self, String> where P: AsRef<Path> {
+		match File::open(path) {
+			Ok(file) => from_reader(file).map_err(|e| e.to_string()),
+			_ => Ok(UserDefaults::default()),
+		}
+	}
+
+	pub fn save<P>(self, path: P) -> Result<(), String> where P: AsRef<Path> {
+		let mut file: File = try!(File::create(path).map_err(|_| "Cannot create user defaults file".to_owned()));
+		file.write_all(to_string(&self).unwrap().as_bytes()).map_err(|_| "Failed to save user defaults".to_owned())
+	}
+}