Exporting

ethcore/src/client/client.rs

@@ -374,6 +374,16 @@ impl<V> Client<V> where V: Verifier {
 		self.chain.configure_cache(pref_cache_size, max_cache_size);
 	}
 
+	/// Look up the block number for the given block ID.
+	pub fn block_number(&self, id: BlockID) -> Option<BlockNumber> {
+		match id {
+			BlockID::Number(number) => Some(number),
+			BlockID::Hash(ref hash) => self.chain.block_number(hash),
+			BlockID::Earliest => Some(0),
+			BlockID::Latest => Some(self.chain.best_block_number())
+		}
+	}
+
 	fn block_hash(chain: &BlockChain, id: BlockID) -> Option<H256> {
 		match id {
 			BlockID::Hash(hash) => Some(hash),
@@ -383,15 +393,6 @@ impl<V> Client<V> where V: Verifier {
 		}
 	}
 
-	fn block_number(&self, id: BlockID) -> Option<BlockNumber> {
-		match id {
-			BlockID::Number(number) => Some(number),
-			BlockID::Hash(ref hash) => self.chain.block_number(hash),
-			BlockID::Earliest => Some(0),
-			BlockID::Latest => Some(self.chain.best_block_number())
-		}
-	}
-
 	fn transaction_address(&self, id: TransactionID) -> Option<TransactionAddress> {
 		match id {
 			TransactionID::Hash(ref hash) => self.chain.transaction_address(hash),

parity/cli.rs

@@ -24,6 +24,7 @@ Parity. Ethereum Client.
 Usage:
   parity daemon <pid-file> [options]
   parity account (new | list) [options]
+  parity export [ <file> ] [options]
   parity [options]
 
 Protocol Options:
@@ -42,9 +43,9 @@ Account Options:
                            ACCOUNTS is a comma-delimited list of addresses.
   --password FILE          Provide a file containing a password for unlocking
                            an account.
-  --keys-iterations NUM    Specify the number of iterations to use when deriving key
-                           from the password (bigger is more secure)
-                           [default: 10240].
+  --keys-iterations NUM    Specify the number of iterations to use when
+                           deriving key from the password (bigger is more
+                           secure) [default: 10240].
   --no-import-keys         Do not import keys from legacy clients.
 
 Networking Options:
@@ -142,6 +143,14 @@ Footprint Options:
                            the entire system, overrides other cache and queue
                            options.
 
+Export Options:
+  --from BLOCK             Export from block BLOCK, which may be an index or
+                           hash [default: 0].
+  --to BLOCK               Export to (including) block NUMBER, which may be an
+                           index, hash or 'latest' [default: latest].
+  --format FORMAT          Export in given format. FORMAT must be one of 'hex'
+                           and 'binary' [default: hex].
+
 Virtual Machine Options:
   --jitvm                  Enable the JIT VM.
 
@@ -186,7 +195,9 @@ pub struct Args {
 	pub cmd_account: bool,
 	pub cmd_new: bool,
 	pub cmd_list: bool,
+	pub cmd_export: bool,
 	pub arg_pid_file: String,
+	pub arg_file: Option<String>,
 	pub flag_chain: String,
 	pub flag_db_path: String,
 	pub flag_identity: String,
@@ -230,6 +241,9 @@ pub struct Args {
 	pub flag_tx_limit: usize,
 	pub flag_logging: Option<String>,
 	pub flag_version: bool,
+	pub flag_from: String,
+	pub flag_to: String,
+	pub flag_format: String,
 	pub flag_jitvm: bool,
 	// legacy...
 	pub flag_geth: bool,

parity/main.rs

@@ -65,7 +65,9 @@ mod configuration;
 
 use ctrlc::CtrlC;
 use util::*;
+use std::fs::File;
 use util::panics::{MayPanic, ForwardPanic, PanicHandler};
+use ethcore::client::{BlockID, BlockChainClient};
 use ethcore::service::ClientService;
 use ethsync::EthSync;
 use ethminer::{Miner, MinerService, ExternalMiner};
@@ -104,6 +106,11 @@ fn execute(conf: Configuration) {
 		return;
 	}
 
+	if conf.args.cmd_export {
+		execute_export(conf);
+		return;
+	}
+
 	execute_client(conf);
 }
 
@@ -216,6 +223,80 @@ fn flush_stdout() {
 	::std::io::stdout().flush().expect("stdout is flushable; qed");
 }
 
+enum DataFormat {
+	Hex,
+	Binary,
+}
+
+fn execute_export(conf: Configuration) {
+	println!("Exporting to {:?} from {}, to {}", conf.args.arg_file, conf.args.flag_from, conf.args.flag_to);
+
+	// Setup panic handler
+	let panic_handler = PanicHandler::new_in_arc();
+
+	// Raise fdlimit
+	unsafe { ::fdlimit::raise_fd_limit(); }
+
+	let spec = conf.spec();
+	let net_settings = NetworkConfiguration {
+		config_path: None,
+		listen_address: None,
+		public_address: None,
+		udp_port: None,
+		nat_enabled: false,
+		discovery_enabled: false,
+		pin: true,
+		boot_nodes: Vec::new(),
+		use_secret: None,
+		ideal_peers: 0,
+	};
+	let client_config = conf.client_config(&spec);
+
+	// Build client
+	let service = ClientService::start(
+		client_config, spec, net_settings, Path::new(&conf.path())
+	).unwrap_or_else(|e| die_with_error("Client", e));
+
+	panic_handler.forward_from(&service);
+	let client = service.client();
+
+	// we have a client!
+	let parse_block_id = |s: &str, arg: &str| -> u64 {
+		if s == "latest" {
+			client.chain_info().best_block_number
+		} else if let Ok(n) = s.parse::<u64>() {
+			n
+		} else if let Ok(h) = H256::from_str(s) {
+			client.block_number(BlockID::Hash(h)).unwrap_or_else(|| {
+				die!("Unknown block hash passed to {} parameter: {:?}", arg, s);
+			})
+		} else {
+			die!("Invalid {} parameter given: {:?}", arg, s);
+		}
+	};
+	let from = parse_block_id(&conf.args.flag_from, "--from");
+	let to = parse_block_id(&conf.args.flag_to, "--to");
+	let format = match conf.args.flag_format.deref() {
+		"binary" | "bin" => DataFormat::Binary,
+		"hex" => DataFormat::Hex,
+		x => die!("Invalid --format parameter given: {:?}", x),
+	};
+
+	let mut out: Box<Write> = if let Some(f) = conf.args.arg_file {
+		Box::new(File::create(&f).unwrap_or_else(|_| die!("Cannot write to file given: {}", f)))
+	} else {
+		Box::new(::std::io::stdout())
+	};
+
+	for i in from..(to + 1) {
+		let b = client.deref().block(BlockID::Number(i)).unwrap();
+		match format {
+			DataFormat::Binary => { out.write(&b).expect("Couldn't write to stream."); }
+			DataFormat::Hex => { out.write_fmt(format_args!("{}", b.pretty())).expect("Couldn't write to stream."); }
+		}
+	}
+}
+
 fn execute_account_cli(conf: Configuration) {
 	use util::keys::store::SecretStore;
 	use rpassword::read_password;