New JSON conversion traits.

Cargo.toml

@@ -21,6 +21,7 @@ eth-secp256k1 = { git = "https://github.com/arkpar/rust-secp256k1.git" }
 rust-crypto = "0.2.34"
 elastic-array = "0.4"
 heapsize = "0.2"
+itertools = "0.4"
 
 [dev-dependencies]
 json-tests = { path = "json-tests" }

src/bytes.rs

@@ -40,7 +40,7 @@ use std::slice;
 use std::cmp::Ordering;
 use std::error::Error as StdError;
 use std::ops::{Deref, DerefMut};
-use uint::{U128, U256};
+use uint::{Uint, U128, U256};
 use hash::FixedHash;
 
 pub struct PrettySlice<'a> (&'a [u8]);

src/common.rs

@@ -1,4 +1,5 @@
 pub use standard::*;
+pub use from_json::*;
 pub use error::*;
 pub use hash::*;
 pub use uint::*;

src/hash.rs

@@ -1,23 +1,18 @@
 //! General hash types, a fixed-size raw-data type used as the output of hash functions.
 
-use std::str::FromStr;
-use std::fmt;
-use std::ops;
-use std::hash::{Hash, Hasher};
-use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitOrAssign, BitAnd, BitXor};
-use std::cmp::{PartialOrd, Ordering};
-use rustc_serialize::hex::*;
+use standard::*;
+use math::log2;
 use error::UtilError;
 use rand::Rng;
 use rand::os::OsRng;
 use bytes::{BytesConvertable,Populatable};
-use math::log2;
-use uint::U256;
+use from_json::*;
+use uint::{Uint, U256};
 
 /// Trait for a fixed-size byte array to be used as the output of hash functions.
 ///
 /// Note: types implementing `FixedHash` must be also `BytesConvertable`.
-pub trait FixedHash: Sized + BytesConvertable + Populatable {
+pub trait FixedHash: Sized + BytesConvertable + Populatable + FromStr + Default {
 	fn new() -> Self;
 	/// Synonym for `new()`. Prefer to new as it's more readable.
 	fn zero() -> Self;
@@ -196,6 +191,20 @@ macro_rules! impl_hash {
 			}
 		}
 
+		impl FromJson for $from {
+			fn from_json(json: &Json) -> Self {
+				match json {
+					&Json::String(ref s) => {
+						match s.len() % 2 {
+							0 => FromStr::from_str(clean_0x(s)).unwrap(),
+							_ => FromStr::from_str(&("0".to_string() + &(clean_0x(s).to_string()))[..]).unwrap()
+						}
+					},
+					_ => Default::default(),
+				}
+			}
+		}
+
 		impl fmt::Debug for $from {
 			fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 				for i in self.0.iter() {
@@ -381,6 +390,7 @@ macro_rules! impl_hash {
 				&self ^ &rhs
 			}
 		}
+
 		impl $from {
 			pub fn hex(&self) -> String {
 				format!("{:?}", self)
@@ -389,6 +399,10 @@ macro_rules! impl_hash {
 			pub fn from_bloomed<T>(b: &T) -> Self where T: FixedHash { b.bloom_part($size) }
 		}
 
+		impl Default for $from {
+			fn default() -> Self { $from::new() }
+		}
+
 		impl From<u64> for $from {
 			fn from(mut value: u64) -> $from {
 				let mut ret = $from::new();

src/json_aid.rs

@@ -8,6 +8,14 @@ pub fn clean(s: &str) -> &str {
 	}
 }
 
+pub fn u256_from_str(s: &str) -> U256 {
+	if s.len() >= 2 && &s[0..2] == "0x" {
+		U256::from_str(&s[2..]).unwrap_or(U256::from(0))
+	} else {
+		U256::from_dec_str(s).unwrap_or(U256::from(0))
+	}
+}
+
 pub fn bytes_from_json(json: &Json) -> Bytes {
 	let s = json.as_string().unwrap_or("");
 	if s.len() % 2 == 1 {
@@ -34,34 +42,97 @@ pub fn vec_h256_from_json(json: &Json) -> Vec<H256> {
 	json.as_array().unwrap().iter().map(&h256_from_json).collect()
 }
 
-pub fn u256_from_str(s: &str) -> U256 {
-	if s.len() >= 2 && &s[0..2] == "0x" {
-		U256::from_str(&s[2..]).unwrap_or(U256::from(0))
-	} else {
-		U256::from_dec_str(s).unwrap_or(U256::from(0))
-	}
-}
-
-pub fn u256_from_json(json: &Json) -> U256 {
-	u256_from_str(json.as_string().unwrap_or(""))
+pub fn map_h256_h256_from_json(json: &Json) -> BTreeMap<H256, H256> {
+	json.as_object().unwrap().iter().fold(BTreeMap::new(), |mut m, (key, value)| {
+		m.insert(H256::from(&u256_from_str(key)), H256::from(&U256::from_json(value)));
+		m
+	})
 }
 
 pub fn usize_from_json(json: &Json) -> usize {
-	u256_from_json(json).low_u64() as usize
+	U256::from_json(json).low_u64() as usize
 }
 
 pub fn u64_from_json(json: &Json) -> u64 {
-	u256_from_json(json).low_u64()
+	U256::from_json(json).low_u64()
 }
 
 pub fn u32_from_json(json: &Json) -> u32 {
-	u256_from_json(json).low_u32()
+	U256::from_json(json).low_u32()
 }
 
 pub fn u16_from_json(json: &Json) -> u16 {
-	u256_from_json(json).low_u32() as u16
+	U256::from_json(json).low_u32() as u16
 }
 
 pub fn u8_from_json(json: &Json) -> u8 {
-	u256_from_json(json).low_u32() as u8
+	U256::from_json(json).low_u32() as u8
+}
+
+impl<T> FromJson for Vec<T> where T: FromJson {
+	fn from_json(json: &Json) -> Self {
+		json.as_array().unwrap().iter().map(|x|T::from_json(x)).collect()
+	}
+}
+
+impl FromJson for u64 {
+	fn from_json(json: &Json) -> Self {
+		U256::from_json(json).low_u64()
+	}
+}
+
+impl FromJson for u32 {
+	fn from_json(json: &Json) -> Self {
+		U256::from_json(json).low_u64() as u32
+	}
+}
+
+impl FromJson for u16 {
+	fn from_json(json: &Json) -> Self {
+		U256::from_json(json).low_u64() as u16
+	}
+}
+
+impl FromJson for u8 {
+	fn from_json(json: &Json) -> Self {
+		U256::from_json(json).low_u64() as u8
+	}
+}
+
+#[test]
+fn u256_from_json() {
+	let j = Json::from_str("{ \"dec\": \"10\", \"hex\": \"0x0a\", \"int\": 10 }").unwrap();
+
+	let v: U256 = xjson!(&j["dec"]);
+	assert_eq!(U256::from(10), v);
+	let v: U256 = xjson!(&j["hex"]);
+	assert_eq!(U256::from(10), v);
+	let v: U256 = xjson!(&j["int"]);
+	assert_eq!(U256::from(10), v);
+}
+
+#[test]
+fn h256_from_json_() {
+	let j = Json::from_str("{ \"with\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\", \"without\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\" }").unwrap();
+
+	let v: H256 = xjson!(&j["with"]);
+	assert_eq!(H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(), v);
+	let v: H256 = xjson!(&j["without"]);
+	assert_eq!(H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(), v);
+}
+
+#[test]
+fn vec_u256_from_json() {
+	let j = Json::from_str("{ \"array\": [ \"10\", \"0x0a\", 10] }").unwrap();
+
+	let v: Vec<U256> = xjson!(&j["array"]);
+	assert_eq!(vec![U256::from(10); 3], v);
+}
+
+#[test]
+fn vec_h256_from_json_() {
+	let j = Json::from_str("{ \"array\": [ \"1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\", \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\"] }").unwrap();
+
+	let v: Vec<H256> = xjson!(&j["array"]);
+	assert_eq!(vec![H256::from_str("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap(); 2], v);
 }

src/lib.rs

@@ -34,16 +34,15 @@ extern crate mio;
 extern crate rand;
 extern crate rocksdb;
 extern crate tiny_keccak;
-
 #[macro_use]
 extern crate heapsize;
 #[macro_use]
 extern crate log;
 #[macro_use]
 extern crate lazy_static;
-
+#[macro_use]
+extern crate itertools;
 extern crate env_logger;
-
 extern crate time;
 extern crate crypto as rcrypto;
 extern crate secp256k1;
@@ -51,12 +50,16 @@ extern crate arrayvec;
 extern crate elastic_array;
 
 pub mod standard;
+#[macro_use]
+pub mod from_json;
+#[macro_use]
 pub mod common;
 pub mod error;
 pub mod hash;
 pub mod uint;
 pub mod bytes;
 pub mod rlp;
+pub mod misc;
 pub mod json_aid;
 pub mod vector;
 pub mod sha3;
@@ -75,6 +78,7 @@ pub mod semantic_version;
 pub mod network;
 
 pub use common::*;
+pub use misc::*;
 pub use json_aid::*;
 pub use rlp::*;
 pub use hashdb::*;

src/sha3.rs

@@ -5,6 +5,8 @@ use tiny_keccak::Keccak;
 use bytes::{BytesConvertable,Populatable};
 use hash::{H256, FixedHash};
 
+pub const SHA3_EMPTY: H256 = H256( [0xc5, 0xd2, 0x46, 0x01, 0x86, 0xf7, 0x23, 0x3c, 0x92, 0x7e, 0x7d, 0xb2, 0xdc, 0xc7, 0x03, 0xc0, 0xe5, 0x00, 0xb6, 0x53, 0xca, 0x82, 0x27, 0x3b, 0x7b, 0xfa, 0xd8, 0x04, 0x5d, 0x85, 0xa4, 0x70] );
+
 /// Types implementing this trait are sha3able.
 ///
 /// ```
@@ -43,12 +45,10 @@ impl<T> Hashable for T where T: BytesConvertable {
 
 #[test]
 fn sha3_empty() {
-	use std::str::FromStr;
-	assert_eq!([0u8; 0].sha3(), H256::from_str("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470").unwrap());
+	assert_eq!([0u8; 0].sha3(), SHA3_EMPTY);
 }
 #[test]
 fn sha3_as() {
-	use std::str::FromStr;
-	assert_eq!([0x41u8; 32].sha3(), H256::from_str("59cad5948673622c1d64e2322488bf01619f7ff45789741b15a9f782ce9290a8").unwrap());
+	assert_eq!([0x41u8; 32].sha3(), From::from("59cad5948673622c1d64e2322488bf01619f7ff45789741b15a9f782ce9290a8"));
 }
 

src/standard.rs

@@ -7,6 +7,7 @@ pub use std::ptr;
 pub use std::result;
 pub use std::option;
 pub use std::mem;
+pub use std::ops;
 
 pub use std::path::Path;
 pub use std::str::{FromStr};
@@ -22,6 +23,7 @@ pub use std::collections::*;
 
 pub use rustc_serialize::json::Json;
 pub use rustc_serialize::base64::FromBase64;
-pub use rustc_serialize::hex::FromHex;
+pub use rustc_serialize::hex::{FromHex, FromHexError};
 
 pub use heapsize::HeapSizeOf;
+pub use itertools::Itertools;

src/uint.rs

@@ -21,17 +21,8 @@
 ///! The functions here are designed to be fast.
 ///!
 
-use std::fmt;
-use std::cmp::*;
-use std::ops::*;
-use std::str::FromStr;
-use std::hash::{Hash, Hasher};
-use rustc_serialize::hex::{FromHex, FromHexError};
-
-pub trait FromDecStr: Sized {
-	type Err;
-	fn from_dec_str(value: &str) -> Result<Self, Self::Err>;
-}
+use standard::*;
+use from_json::*;
 
 macro_rules! impl_map_from {
 	($thing:ident, $from:ty, $to:ty) => {
@@ -43,32 +34,77 @@ macro_rules! impl_map_from {
 	}
 }
 
+pub trait Uint: Sized + Default + FromStr + From<u64> + FromJson + fmt::Debug + fmt::Display + PartialOrd + Ord + PartialEq + Eq + Hash {
+
+	/// Size of this type.
+	const SIZE: usize;
+
+	fn zero() -> Self;
+	fn one() -> Self;
+
+	type FromDecStrErr;
+	fn from_dec_str(value: &str) -> Result<Self, Self::FromDecStrErr>;
+
+	/// Conversion to u32
+	fn low_u32(&self) -> u32;
+
+	/// Conversion to u64
+	fn low_u64(&self) -> u64;
+
+	/// Conversion to u32 with overflow checking
+	fn as_u32(&self) -> u32;
+
+	/// Conversion to u64 with overflow checking
+	fn as_u64(&self) -> u64;
+	
+	/// Return the least number of bits needed to represent the number
+	fn bits(&self) -> usize;
+	fn bit(&self, index: usize) -> bool;
+	fn byte(&self, index: usize) -> u8;
+	fn to_bytes(&self, bytes: &mut[u8]);
+
+	fn exp10(n: usize) -> Self;
+}
+
 macro_rules! construct_uint {
 	($name:ident, $n_words:expr) => (
 		/// Little-endian large integer type
 		#[derive(Copy, Clone, Eq, PartialEq)]
 		pub struct $name(pub [u64; $n_words]);
 
-		impl $name {
-			pub const SIZE: usize = $n_words * 8;
+		impl Uint for $name {
+			const SIZE: usize = $n_words * 8;
+
+			type FromDecStrErr = FromHexError;
+
+			/// TODO: optimize, throw appropriate err
+			fn from_dec_str(value: &str) -> Result<Self, Self::FromDecStrErr> {
+				Ok(value.bytes()
+				   .map(|b| b - 48)
+				   .fold($name::from(0u64), | acc, c |
+						 // fast multiplication by 10
+						 // (acc << 3) + (acc << 1) => acc * 10
+						 (acc << 3) + (acc << 1) + $name::from(c)
+					))
+			}
 
 			/// Conversion to u32
 			#[inline]
-			pub fn low_u32(&self) -> u32 {
+			fn low_u32(&self) -> u32 {
 				let &$name(ref arr) = self;
 				arr[0] as u32
 			}
 
 			/// Conversion to u64
 			#[inline]
-			pub fn low_u64(&self) -> u64 {
+			fn low_u64(&self) -> u64 {
 				let &$name(ref arr) = self;
 				arr[0]
 			}
 
 			/// Conversion to u32 with overflow checking
 			#[inline]
-			pub fn as_u32(&self) -> u32 {
+			fn as_u32(&self) -> u32 {
 				let &$name(ref arr) = self;
 				if (arr[0] & (0xffffffffu64 << 32)) != 0 {
 					panic!("Integer overflow when casting U256") 
@@ -78,7 +114,7 @@ macro_rules! construct_uint {
 
 			/// Conversion to u64 with overflow checking
 			#[inline]
-			pub fn as_u64(&self) -> u64 {
+			fn as_u64(&self) -> u64 {
 				let &$name(ref arr) = self;
 				for i in 1..$n_words {
 					if arr[i] != 0 {
@@ -89,7 +125,7 @@ macro_rules! construct_uint {
 			}
 			/// Return the least number of bits needed to represent the number
 			#[inline]
-			pub fn bits(&self) -> usize {
+			fn bits(&self) -> usize {
 				let &$name(ref arr) = self;
 				for i in 1..$n_words {
 					if arr[$n_words - i] > 0 { return (0x40 * ($n_words - i + 1)) - arr[$n_words - i].leading_zeros() as usize; }
@@ -98,18 +134,18 @@ macro_rules! construct_uint {
 			}
 
 			#[inline]
-			pub fn bit(&self, index: usize) -> bool {
+			fn bit(&self, index: usize) -> bool {
 				let &$name(ref arr) = self;
 				arr[index / 64] & (1 << (index % 64)) != 0
 			}
 
 			#[inline]
-			pub fn byte(&self, index: usize) -> u8 {
+			fn byte(&self, index: usize) -> u8 {
 				let &$name(ref arr) = self;
 				(arr[index / 8] >> ((index % 8)) * 8) as u8
 			}
 
-			pub fn to_bytes(&self, bytes: &mut[u8]) {
+			fn to_bytes(&self, bytes: &mut[u8]) {
 				assert!($n_words * 8 == bytes.len());
 				let &$name(ref arr) = self;
 				for i in 0..bytes.len() {
@@ -120,7 +156,7 @@ macro_rules! construct_uint {
 			}
 
 			#[inline]
-			pub fn exp10(n: usize) -> $name {
+			fn exp10(n: usize) -> $name {
 				match n {
 					0 => $name::from(1u64),
 					_ => $name::exp10(n - 1) * $name::from(10u64)
@@ -128,15 +164,17 @@ macro_rules! construct_uint {
 			}
 
 			#[inline]
-			pub fn zero() -> $name {
+			fn zero() -> $name {
 				From::from(0u64)
 			}
 
 			#[inline]
-			pub fn one() -> $name {
+			fn one() -> $name {
 				From::from(1u64)
 			}
+		}
 
+		impl $name {
 			/// Multiplication by u32
 			fn mul_u32(self, other: u32) -> $name {
 				let $name(ref arr) = self;
@@ -154,6 +192,12 @@ macro_rules! construct_uint {
 			}
 		}
 
+		impl Default for $name {
+			fn default() -> Self {
+				$name::zero()
+			}
+		}
+
 		impl From<u64> for $name {
 			fn from(value: u64) -> $name {
 				let mut ret = [0; $n_words];
@@ -162,6 +206,23 @@ macro_rules! construct_uint {
 			}
 		}
 
+		impl FromJson for $name {
+			fn from_json(json: &Json) -> Self {
+				match json {
+					&Json::String(ref s) => {
+						if s.len() >= 2 && &s[0..2] == "0x" {
+							FromStr::from_str(&s[2..]).unwrap_or(Default::default())
+						} else {
+							Uint::from_dec_str(s).unwrap_or(Default::default())
+						}
+					},
+					&Json::U64(u) => From::from(u),
+					&Json::I64(i) => From::from(i as u64),
+					_ => Uint::zero(),
+				}
+			}
+		}
+
 		impl_map_from!($name, u8, u64);
 		impl_map_from!($name, u16, u64);
 		impl_map_from!($name, u32, u64);
@@ -443,22 +504,6 @@ macro_rules! construct_uint {
 				state.finish();
 			}
 		}
-
-		impl FromDecStr for $name {
-			type Err = FromHexError;
-
-			/// TODO: optimize, throw appropriate err
-			fn from_dec_str(value: &str) -> Result<Self, Self::Err> {
-				Ok(value.bytes()
-				   .map(|b| b - 48)
-				   .fold($name::from(0u64), | acc, c |
-						 // fast multiplication by 10
-						 // (acc << 3) + (acc << 1) => acc * 10
-						 (acc << 3) + (acc << 1) + $name::from(c)
-					))
-			}
-		}
-
 	);
 }
 
@@ -557,8 +602,7 @@ pub const BAD_U256: U256 = U256([0xffffffffffffffffu64; 4]);
 
 #[cfg(test)]
 mod tests {
-	use uint::U256;
-	use uint::FromDecStr;
+	use uint::{Uint, U256};
 	use std::str::FromStr;
 
 	#[test]