eth_getwork implemented.

Cargo.lock

@@ -203,6 +203,7 @@ name = "ethcore-rpc"
 version = "0.9.99"
 dependencies = [
  "clippy 0.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethash 0.9.99",
  "ethcore 0.9.99",
  "ethcore-util 0.9.99",
  "ethsync 0.9.99",

ethash/src/compute.rs

@@ -172,7 +172,8 @@ fn get_data_size(block_number: u64) -> usize {
 }
 
 #[inline]
-fn get_seedhash(block_number: u64) -> H256 {
+/// Given the `block_number`, determine the seed hash for Ethash.
+pub fn get_seedhash(block_number: u64) -> H256 {
 	let epochs = block_number / ETHASH_EPOCH_LENGTH;
 	let mut ret: H256 = [0u8; 32];
 	for _ in 0..epochs {

ethash/src/lib.rs

@@ -24,7 +24,7 @@ mod compute;
 
 use std::mem;
 use compute::Light;
-pub use compute::{quick_get_difficulty, H256, ProofOfWork, ETHASH_EPOCH_LENGTH};
+pub use compute::{get_seedhash, quick_get_difficulty, H256, ProofOfWork, ETHASH_EPOCH_LENGTH};
 
 use std::sync::{Arc, Mutex};
 
@@ -35,7 +35,7 @@ struct LightCache {
 	prev: Option<Arc<Light>>,
 }
 
-/// Lighy/Full cache manager
+/// Light/Full cache manager.
 pub struct EthashManager {
 	cache: Mutex<LightCache>,
 }

ethcore/src/client.rs

@@ -195,7 +195,7 @@ pub struct Client {
 	panic_handler: Arc<PanicHandler>,
 
 	// for sealing...
-	_sealing_block: Mutex<Option<ClosedBlock>>,
+	sealing_block: Mutex<Option<ClosedBlock>>,
 }
 
 const HISTORY: u64 = 1000;
@@ -232,7 +232,7 @@ impl Client {
 			report: RwLock::new(Default::default()),
 			import_lock: Mutex::new(()),
 			panic_handler: panic_handler,
-			_sealing_block: Mutex::new(None),
+			sealing_block: Mutex::new(None),
 		}))
 	}
 
@@ -417,9 +417,7 @@ impl Client {
 	/// New chain head event.
 	pub fn new_chain_head(&self) {
 		let h = self.chain.read().unwrap().best_block_hash();
-		info!("NEW CHAIN HEAD: #{}: {}", self.chain.read().unwrap().best_block_number(), h);
-
-		info!("Preparing to seal.");
+		info!("New best block: #{}: {}", self.chain.read().unwrap().best_block_number(), h);
 		let b = OpenBlock::new(
 			self.engine.deref().deref(),
 			self.state_db.lock().unwrap().clone(),
@@ -430,8 +428,11 @@ impl Client {
 		);
 		let b = b.close();
 		info!("Sealed: hash={}, diff={}, number={}", b.hash(), b.block().header().difficulty(), b.block().header().number());
-		*self._sealing_block.lock().unwrap() = Some(b);
+		*self.sealing_block.lock().unwrap() = Some(b);
 	}
+
+	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
+	pub fn sealing_block(&self) -> &Mutex<Option<ClosedBlock>> { &self.sealing_block }
 }
 
 // TODO: need MinerService MinerIoHandler

ethcore/src/ethereum/ethash.rs

@@ -241,10 +241,16 @@ impl Ethash {
 		target
 	}
 
-	fn boundary_to_difficulty(boundary: &H256) -> U256 {
+	/// Convert an Ethash boundary to its original difficulty. Basically just `f(x) = 2^256 / x`.
+	pub fn boundary_to_difficulty(boundary: &H256) -> U256 {
 		U256::from((U512::one() << 256) / x!(U256::from(boundary.as_slice())))
 	}
 
+	/// Convert an Ethash difficulty to the target boundary. Basically just `f(x) = 2^256 / x`.
+	pub fn difficulty_to_boundary(difficulty: &U256) -> H256 {
+		x!(U256::from((U512::one() << 256) / x!(difficulty)))
+	}
+
 	fn to_ethash(hash: H256) -> EH256 {
 		unsafe { mem::transmute(hash) }
 	}

rpc/Cargo.toml

@@ -15,6 +15,7 @@ jsonrpc-core = "1.2"
 jsonrpc-http-server = "2.1"
 ethcore-util = { path = "../util" }
 ethcore = { path = "../ethcore" }
+ethash = { path = "../ethash" }
 ethsync = { path = "../sync" }
 clippy = { version = "0.0.44", optional = true }
 rustc-serialize = "0.3"

rpc/src/v1/impls/eth.rs

@@ -22,7 +22,11 @@ use util::hash::*;
 use util::uint::*;
 use util::sha3::*;
 use ethcore::client::*;
+use ethcore::block::{IsBlock};
 use ethcore::views::*;
+extern crate ethash;
+use self::ethash::get_seedhash;
+use ethcore::ethereum::Ethash;
 use ethcore::ethereum::denominations::shannon;
 use v1::traits::{Eth, EthFilter};
 use v1::types::{Block, BlockTransactions, BlockNumber, Bytes, SyncStatus, SyncInfo, Transaction, OptionalValue, Index, Filter, Log};
@@ -209,6 +213,29 @@ impl Eth for EthClient {
 				to_value(&logs)
 			})
 	}
+
+	fn work(&self, params: Params) -> Result<Value, Error> {
+		match params {
+			Params::None => {
+				let c = take_weak!(self.client);
+				let u = c.sealing_block().lock().unwrap();
+				match *u {
+					Some(ref b) => {
+						let current_hash = b.hash();
+						let target = Ethash::difficulty_to_boundary(b.block().header().difficulty());
+						let seed_hash = get_seedhash(b.block().header().number());
+						to_value(&(current_hash, seed_hash, target))
+					}
+					_ => Err(Error::invalid_params())
+				}
+			},
+			_ => Err(Error::invalid_params())
+		}
+	}
+
+//	fn submit_work(&self, _: Params) -> Result<Value, Error> { rpc_unimplemented!() }
+
+//	fn submit_hashrate(&self, _: Params) -> Result<Value, Error> { rpc_unimplemented!() }
 }
 
 /// Eth filter rpc implementation.

util/src/misc.rs

@@ -69,5 +69,5 @@ pub fn contents(name: &str) -> Result<Bytes, UtilError> {
 
 /// Get the standard version string for this software.
 pub fn version() -> String {
-	format!("Parity//{}-{}-{}/{}-{}-{}/rustc{}", env!("CARGO_PKG_VERSION"), short_sha(), commit_date().replace("-", ""), Target::arch(), Target::os(), Target::env(), rustc_version::version())
+	format!("Parity//v{}-{}-{}/{}-{}-{}/rustc{}", env!("CARGO_PKG_VERSION"), short_sha(), commit_date().replace("-", ""), Target::arch(), Target::os(), Target::env(), rustc_version::version())
 }

util/src/uint.rs

@@ -1124,6 +1124,33 @@ impl From<U512> for U256 {
 	}
 }
 
+impl<'a> From<&'a U256> for U512 {
+	fn from(value: &'a U256) -> U512 {
+		let U256(ref arr) = *value;
+		let mut ret = [0; 8];
+		ret[0] = arr[0];
+		ret[1] = arr[1];
+		ret[2] = arr[2];
+		ret[3] = arr[3];
+		U512(ret)
+	}
+}
+
+impl<'a> From<&'a U512> for U256 {
+	fn from(value: &'a U512) -> U256 {
+		let U512(ref arr) = *value;
+		if arr[4] | arr[5] | arr[6] | arr[7] != 0 {
+			panic!("Overflow");
+		}
+		let mut ret = [0; 4];
+		ret[0] = arr[0];
+		ret[1] = arr[1];
+		ret[2] = arr[2];
+		ret[3] = arr[3];
+		U256(ret)
+	}
+}
+
 impl From<U256> for U128 {
 	fn from(value: U256) -> U128 {
 		let U256(ref arr) = value;