Moved consensus related constants to their own core module.

core/src/core/block.rs

@@ -23,9 +23,8 @@ use std::collections::HashSet;
 use core::Committed;
 use core::{Input, Output, Proof, TxProof, Transaction};
 use core::transaction::merkle_inputs_outputs;
-use core::{PROOFSIZE, REWARD};
+use consensus::{PROOFSIZE, REWARD, MAX_IN_OUT_LEN};
 use core::hash::{Hash, Hashed, ZERO_HASH};
-use core::transaction::MAX_IN_OUT_LEN;
 use ser::{self, Readable, Reader, Writeable, Writer};
 
 /// Block header, fairly standard compared to other blockchains.

core/src/core/hash.rs

@@ -60,7 +60,7 @@ pub const ZERO_HASH: Hash = Hash([0; 32]);
 
 /// Serializer that outputs a hash of the serialized object
 pub struct HashWriter {
-	state: Keccak
+	state: Keccak,
 }
 
 impl HashWriter {
@@ -71,9 +71,7 @@ impl HashWriter {
 
 impl Default for HashWriter {
 	fn default() -> HashWriter {
-		HashWriter {
-			state: Keccak::new_sha3_256()
-		}
+		HashWriter { state: Keccak::new_sha3_256() }
 	}
 }
 
@@ -90,7 +88,7 @@ impl ser::Writer for HashWriter {
 
 /// A trait for types that have a canonical hash
 pub trait Hashed {
-       fn hash(&self) -> Hash;
+	fn hash(&self) -> Hash;
 }
 
 impl<W: ser::Writeable> Hashed for W {
@@ -112,4 +110,3 @@ impl Hashed for [u8] {
 		Hash(ret)
 	}
 }
-

core/src/core/mod.rs

@@ -19,25 +19,17 @@ pub mod hash;
 pub mod transaction;
 #[allow(dead_code)]
 
-pub use self::block::{Block, BlockHeader};
-pub use self::transaction::{Transaction, Input, Output, TxProof};
-use self::hash::{Hash, Hashed, ZERO_HASH};
-use ser::{Writeable, Writer, Error};
-
 use std::fmt;
 use std::cmp::Ordering;
 
 use secp::{self, Secp256k1};
 use secp::pedersen::*;
 
-/// The block subsidy amount
-pub const REWARD: u64 = 1_000_000_000;
-
-/// Block interval, in seconds
-pub const BLOCK_TIME_SEC: u8 = 15;
-
-/// Cuckoo-cycle proof size (cycle length)
-pub const PROOFSIZE: usize = 42;
+use consensus::PROOFSIZE;
+pub use self::block::{Block, BlockHeader};
+pub use self::transaction::{Transaction, Input, Output, TxProof};
+use self::hash::{Hash, Hashed, ZERO_HASH};
+use ser::{Writeable, Writer, Error};
 
 /// Implemented by types that hold inputs and outputs including Pedersen
 /// commitments. Handles the collection of the commitments as well as their
@@ -156,8 +148,10 @@ impl Writeable for HPair {
 	}
 }
 /// An iterator over hashes in a vector that pairs them to build a row in a
-/// Merkle tree. If the vector has an odd number of hashes, it appends a zero hash
-/// See https://bitcointalk.org/index.php?topic=102395.0 CVE-2012-2459 (block merkle calculation exploit)
+/// Merkle tree. If the vector has an odd number of hashes, it appends a zero
+/// hash
+/// See https://bitcointalk.org/index.php?topic=102395.0 CVE-2012-2459 (block
+/// merkle calculation exploit)
 /// for the argument against duplication of last hash
 struct HPairIter(Vec<Hash>);
 impl Iterator for HPairIter {

core/src/core/transaction.rs

@@ -14,18 +14,15 @@
 
 //! Transactions
 
-use core::Committed;
-use core::MerkleRow;
-use core::hash::{Hash, Hashed};
-use ser::{self, Reader, Writer, Readable, Writeable};
-
 use secp::{self, Secp256k1, Message, Signature};
 use secp::key::SecretKey;
 use secp::pedersen::{RangeProof, Commitment};
 
-/// The maximum number of inputs or outputs a transaction may have
-/// and be deserializable.
-pub const MAX_IN_OUT_LEN: u64 = 50000;
+use consensus::MAX_IN_OUT_LEN;
+use core::Committed;
+use core::MerkleRow;
+use core::hash::{Hash, Hashed};
+use ser::{self, Reader, Writer, Readable, Writeable};
 
 /// A proof that a transaction did not create (or remove) funds. Includes both
 /// the transaction's Pedersen commitment and the signature that guarantees

core/src/lib.rs

@@ -31,6 +31,7 @@ extern crate tiny_keccak;
 #[macro_use]
 pub mod macros;
 
+pub mod consensus;
 pub mod core;
 pub mod genesis;
 pub mod pow;

core/src/pow/cuckoo.rs

@@ -23,7 +23,8 @@ use std::cmp;
 use crypto::digest::Digest;
 use crypto::sha2::Sha256;
 
-use core::{Proof, PROOFSIZE};
+use consensus::PROOFSIZE;
+use core::Proof;
 use pow::siphash::siphash24;
 
 const MAXPATHLEN: usize = 8192;

core/src/pow/mod.rs

@@ -27,28 +27,14 @@ mod cuckoo;
 
 use time;
 
-use core::{Block, Proof, PROOFSIZE};
+use consensus::{SIZESHIFT, EASINESS};
+use core::{Block, Proof};
 use core::hash::{Hash, Hashed};
 use pow::cuckoo::{Cuckoo, Miner, Error};
 
 use ser;
 use ser::{Writeable, Writer};
 
-/// Default Cuckoo Cycle size shift used is 28. We may decide to increase it.
-/// when difficuty increases.
-const SIZESHIFT: u32 = 28;
-
-/// Default Cuckoo Cycle easiness, high enough to have good likeliness to find
-/// a solution.
-const EASINESS: u32 = 50;
-
-/// Max target hash, lowest difficulty
-pub const MAX_TARGET: [u32; PROOFSIZE] =
-	[0xfff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
-	 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff];
-
 /// Subset of a block header that goes into hashing for proof of work.
 /// Basically the whole thing minus the PoW solution itself and the total
 /// difficulty (yet unknown). We also add the count of every variable length
@@ -169,6 +155,7 @@ fn pow_size(b: &Block, target: Proof, sizeshift: u32) -> Result<(Proof, u64), Er
 #[cfg(test)]
 mod test {
 	use super::*;
+	use consensus::MAX_TARGET;
 	use core::Proof;
 	use genesis;
 

core/src/ser.rs

@@ -49,9 +49,11 @@ impl fmt::Display for Error {
 	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 		match *self {
 			Error::IOErr(ref e) => write!(f, "{}", e),
-			Error::UnexpectedData { expected: ref e, received: ref r } => write!(f, "expected {:?}, got {:?}", e, r),
+			Error::UnexpectedData { expected: ref e, received: ref r } => {
+				write!(f, "expected {:?}, got {:?}", e, r)
+			}
 			Error::CorruptedData => f.write_str("corrupted data"),
-			Error::TooLargeReadErr(ref s) => f.write_str(&s)
+			Error::TooLargeReadErr(ref s) => f.write_str(&s),
 		}
 	}
 }
@@ -60,7 +62,7 @@ impl error::Error for Error {
 	fn cause(&self) -> Option<&error::Error> {
 		match *self {
 			Error::IOErr(ref e) => Some(e),
-			_ => None
+			_ => None,
 		}
 	}
 
@@ -69,7 +71,7 @@ impl error::Error for Error {
 			Error::IOErr(ref e) => error::Error::description(e),
 			Error::UnexpectedData { expected: _, received: _ } => "unexpected data",
 			Error::CorruptedData => "corrupted data",
-			Error::TooLargeReadErr(ref s) => s
+			Error::TooLargeReadErr(ref s) => s,
 		}
 	}
 }
@@ -90,7 +92,7 @@ pub enum SerializationMode {
 	/// Serialize the data that defines the object
 	Hash,
 	/// Serialize everything that a signer of the object should know
-	SigHash
+	SigHash,
 }
 
 /// Implementations defined how different numbers and binary structures are