derive codec for inherent data (#2714)

* derive codec for inherent data

* increase spec version

substrate/core/inherents/src/lib.rs

@@ -53,7 +53,7 @@ pub use runtime_primitives::RuntimeString;
 pub type InherentIdentifier = [u8; 8];
 
 /// Inherent data to include in a block.
-#[derive(Clone, Default)]
+#[derive(Clone, Default, Encode, Decode)]
 pub struct InherentData {
 	/// All inherent data encoded with parity-codec and an identifier.
 	data: BTreeMap<InherentIdentifier, Vec<u8>>
@@ -123,33 +123,6 @@ impl InherentData {
 	}
 }
 
-impl codec::Encode for InherentData {
-	fn encode(&self) -> Vec<u8> {
-		let keys = self.data.keys().collect::<Vec<_>>();
-		let values = self.data.values().collect::<Vec<_>>();
-
-		let mut encoded = keys.encode();
-		encoded.extend(values.encode());
-		encoded
-	}
-}
-
-impl codec::Decode for InherentData {
-	fn decode<I: codec::Input>(value: &mut I) -> Option<Self> {
-		Vec::<InherentIdentifier>::decode(value)
-			.and_then(|i| Vec::<Vec<u8>>::decode(value).map(|v| (i, v)))
-			.and_then(|(i, v)| {
-				if i.len() == v.len() {
-					Some(Self {
-						data: i.into_iter().zip(v.into_iter()).collect()
-					})
-				} else {
-					None
-				}
-			})
-	}
-}
-
 /// The result of checking inherents.
 ///
 /// It either returns okay for all checks, stores all occurred errors or just one fatal error.

substrate/node/runtime/src/lib.rs

@@ -58,7 +58,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 86,
+	spec_version: 87,
 	impl_version: 87,
 	apis: RUNTIME_API_VERSIONS,
 };