make generic seal take valid rlp

ethcore/res/authority_round.json

@@ -21,8 +21,7 @@
 	"genesis": {
 		"seal": {
 			"generic": {
-				"fields": 2,
-				"rlp": "0x200"
+				"rlp": "0xc28080"
 			}
 		},
 		"difficulty": "0x20000",

ethcore/res/instant_seal.json

@@ -12,7 +12,6 @@
 	"genesis": {
 		"seal": {
 			"generic": {
-				"fields": 0,
 				"rlp": "0x0"
 			}
 		},

ethcore/src/spec/seal.rs

@@ -30,11 +30,9 @@ pub struct Ethereum {
 
 impl Into<Generic> for Ethereum {
 	fn into(self) -> Generic {
-		let mut s = RlpStream::new();
-		s.append(&self.mix_hash);
-		s.append(&self.nonce);
+		let mut s = RlpStream::new_list(2);
+		s.append(&self.mix_hash).append(&self.nonce);
 		Generic {
-			fields: 2,
 			rlp: s.out()
 		}
 	}
@@ -42,8 +40,6 @@ impl Into<Generic> for Ethereum {
 
 /// Generic seal.
 pub struct Generic {
-	/// Number of seal fields.
-	pub fields: usize,
 	/// Seal rlp.
 	pub rlp: Vec<u8>,
 }
@@ -64,7 +60,6 @@ impl From<ethjson::spec::Seal> for Seal {
 				mix_hash: eth.mix_hash.into()
 			}),
 			ethjson::spec::Seal::Generic(g) => Seal::Generic(Generic {
-				fields: g.fields,
 				rlp: g.rlp.into()
 			})
 		}

ethcore/src/spec/spec.rs

@@ -94,8 +94,6 @@ pub struct Spec {
 	pub receipts_root: H256,
 	/// The genesis block's extra data field.
 	pub extra_data: Bytes,
-	/// The number of seal fields in the genesis block.
-	pub seal_fields: usize,
 	/// Each seal field, expressed as RLP, concatenated.
 	pub seal_rlp: Bytes,
 
@@ -127,7 +125,6 @@ impl From<ethjson::spec::Spec> for Spec {
 			gas_used: g.gas_used,
 			timestamp: g.timestamp,
 			extra_data: g.extra_data,
-			seal_fields: seal.fields,
 			seal_rlp: seal.rlp,
 			state_root_memo: RwLock::new(g.state_root),
 			genesis_state: From::from(s.accounts),
@@ -192,13 +189,8 @@ impl Spec {
 		header.set_gas_limit(self.gas_limit.clone());
 		header.set_difficulty(self.difficulty.clone());
 		header.set_seal({
-			let seal = {
-				let mut s = RlpStream::new_list(self.seal_fields);
-				s.append_raw(&self.seal_rlp, self.seal_fields);
-				s.out()
-			};
-			let r = Rlp::new(&seal);
-			(0..self.seal_fields).map(|i| r.at(i).as_raw().to_vec()).collect()
+			let r = Rlp::new(&self.seal_rlp);
+			r.iter().map(|f| f.as_raw().to_vec()).collect()
 		});
 		trace!(target: "spec", "Header hash is {}", header.hash());
 		header
@@ -227,7 +219,6 @@ impl Spec {
 		self.gas_used = g.gas_used;
 		self.timestamp = g.timestamp;
 		self.extra_data = g.extra_data;
-		self.seal_fields = seal.fields;
 		self.seal_rlp = seal.rlp;
 		self.state_root_memo = RwLock::new(g.state_root);
 	}

json/src/spec/seal.rs

@@ -32,9 +32,7 @@ pub struct Ethereum {
 /// Generic seal.
 #[derive(Debug, PartialEq, Deserialize)]
 pub struct Generic {
-	/// Number of fields.
-	pub fields: usize,
-	/// Their rlp.
+	/// Seal rlp.
 	pub rlp: Bytes,
 }
 
@@ -63,11 +61,10 @@ mod tests {
 			}
 		},{
 			"generic": {
-				"fields": 1,
-				"rlp": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
+				"rlp": "0xe011bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
 			}
 		}]"#;
-		let _deserialized: Vec<Seal> = serde_json::from_str(s).unwrap();
+		let deserialized: Vec<Seal> = serde_json::from_str(s).unwrap();
 		// TODO: validate all fields
 	}
 }