implement more convertion on NumberOrHex (#7682)

primitives/rpc/src/number.rs

@@ -18,7 +18,7 @@
 //! A number type that can be serialized both as a number or a string that encodes a number in a
 //! string.
 
-use std::{convert::TryFrom, fmt::Debug};
+use std::{convert::{TryFrom, TryInto}, fmt::Debug};
 use serde::{Serialize, Deserialize};
 use sp_core::U256;
 
@@ -67,24 +67,27 @@ pub struct TryFromIntError(pub(crate) ());
 impl TryFrom<NumberOrHex> for u32 {
 	type Error = TryFromIntError;
 	fn try_from(num_or_hex: NumberOrHex) -> Result<u32, TryFromIntError> {
-		let num_or_hex = num_or_hex.into_u256();
-		if num_or_hex > U256::from(u32::max_value()) {
-			return Err(TryFromIntError(()));
-		} else {
-			Ok(num_or_hex.as_u32())
-		}
+		num_or_hex.into_u256().try_into().map_err(|_| TryFromIntError(()))
 	}
 }
 
 impl TryFrom<NumberOrHex> for u64 {
 	type Error = TryFromIntError;
 	fn try_from(num_or_hex: NumberOrHex) -> Result<u64, TryFromIntError> {
-		let num_or_hex = num_or_hex.into_u256();
-		if num_or_hex > U256::from(u64::max_value()) {
-			return Err(TryFromIntError(()));
-		} else {
-			Ok(num_or_hex.as_u64())
-		}
+		num_or_hex.into_u256().try_into().map_err(|_| TryFromIntError(()))
+	}
+}
+
+impl TryFrom<NumberOrHex> for u128 {
+	type Error = TryFromIntError;
+	fn try_from(num_or_hex: NumberOrHex) -> Result<u128, TryFromIntError> {
+		num_or_hex.into_u256().try_into().map_err(|_| TryFromIntError(()))
+	}
+}
+
+impl From<NumberOrHex> for U256 {
+	fn from(num_or_hex: NumberOrHex) -> U256 {
+		num_or_hex.into_u256()
 	}
 }