Genesis creation utilities.

substrate/client/src/genesis.rs

@@ -0,0 +1,37 @@
+// Copyright 2017 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot 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.
+
+// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tool for creating the genesis block.
+
+use std::collections::HashMap;
+use native_runtime::primitives::{Block, Header};
+use triehash::trie_root;
+
+/// Create a genesis block, given the initial storage.
+pub fn construct_genesis_block(storage: &HashMap<Vec<u8>, Vec<u8>>) -> Block {
+	let state_root = trie_root(storage.clone().into_iter()).0;
+	let header = Header {
+		parent_hash: Default::default(),
+		number: 0,
+		state_root,
+		transaction_root: trie_root(vec![].into_iter()).0,
+		digest: Default::default(),
+	};
+	Block {
+		header,
+		transactions: vec![],
+	}
+}

substrate/client/src/lib.rs

@@ -21,7 +21,9 @@
 extern crate polkadot_primitives as primitives;
 extern crate polkadot_state_machine as state_machine;
 extern crate polkadot_serializer as ser;
+extern crate native_runtime;
 
+extern crate triehash;
 extern crate parking_lot;
 #[macro_use] extern crate error_chain;
 #[macro_use] extern crate log;
@@ -31,6 +33,10 @@ pub mod blockchain;
 pub mod backend;
 pub mod in_mem;
 
+mod genesis;
+
+pub use genesis::construct_genesis_block;
+
 pub use blockchain::Info as ChainInfo;
 pub use blockchain::BlockId;