make block builder and construct_runtime! generic over inherent-data (#1191)

* make block builder generic over inherent-data

* construct_runtime has you specify inherent data type

* get all tests to compile

substrate/core/client/src/block_builder/api.rs

@@ -16,19 +16,19 @@
 
 //! The runtime api for building blocks.
 
-use runtime_primitives::{traits::Block as BlockT, ApplyResult, InherentData, CheckInherentError};
+use runtime_primitives::{traits::Block as BlockT, ApplyResult, CheckInherentError};
 use rstd::vec::Vec;
 
 decl_runtime_apis! {
 	/// The `BlockBuilder` api trait that provides required functions for building a block for a runtime.
-	pub trait BlockBuilder {
+	pub trait BlockBuilder<InherentData> {
 		/// Apply the given extrinsics.
 		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult;
 		/// Finish the current block.
 		fn finalise_block() -> <Block as BlockT>::Header;
-		/// Generate inherent extrinsics.
+		/// Generate inherent extrinsics. The inherent data will vary from chain to chain.
 		fn inherent_extrinsics(inherent: InherentData) -> Vec<<Block as BlockT>::Extrinsic>;
-		/// Check that the inherents are valid.
+		/// Check that the inherents are valid. The inherent data will vary from chain to chain.
 		fn check_inherents(block: Block, data: InherentData) -> Result<(), CheckInherentError>;
 		/// Generate a random seed.
 		fn random_seed() -> <Block as BlockT>::Hash;

substrate/core/client/src/block_builder/block_builder.rs

@@ -16,6 +16,7 @@
 
 use super::api::BlockBuilder as BlockBuilderApi;
 use std::vec::Vec;
+use std::marker::PhantomData;
 use codec::Encode;
 use blockchain::HeaderBackend;
 use runtime_primitives::traits::{
@@ -28,18 +29,19 @@ use error;
 use runtime_primitives::ApplyOutcome;
 
 /// Utility for building new (valid) blocks from a stream of extrinsics.
-pub struct BlockBuilder<'a, Block, A: ProvideRuntimeApi> where Block: BlockT {
+pub struct BlockBuilder<'a, Block, InherentData, A: ProvideRuntimeApi> where Block: BlockT {
 	header: <Block as BlockT>::Header,
 	extrinsics: Vec<<Block as BlockT>::Extrinsic>,
 	api: ApiRef<'a, A::Api>,
 	block_id: BlockId<Block>,
+	_marker: PhantomData<InherentData>,
 }
 
-impl<'a, Block, A> BlockBuilder<'a, Block, A>
+impl<'a, Block, A, InherentData> BlockBuilder<'a, Block, InherentData, A>
 where
 	Block: BlockT<Hash=H256>,
 	A: ProvideRuntimeApi + HeaderBackend<Block> + 'a,
-	A::Api: BlockBuilderApi<Block>,
+	A::Api: BlockBuilderApi<Block, InherentData>,
 {
 	/// Create a new instance of builder from the given client, building on the latest block.
 	pub fn new(api: &'a A) -> error::Result<Self> {
@@ -72,6 +74,7 @@ where
 			extrinsics: Vec::new(),
 			api,
 			block_id: *block_id,
+			_marker: PhantomData,
 		})
 	}
 
@@ -79,12 +82,12 @@ where
 	/// can be validly executed (by executing it); if it is invalid, it'll be returned along with
 	/// the error. Otherwise, it will return a mutable reference to self (in order to chain).
 	pub fn push(&mut self, xt: <Block as BlockT>::Extrinsic) -> error::Result<()> {
-		fn impl_push<'a, T, Block: BlockT>(
+		fn impl_push<'a, T, Block: BlockT, InherentData>(
 			api: &mut ApiRef<'a, T>,
 			block_id: &BlockId<Block>,
 			xt: Block::Extrinsic,
 			extrinsics: &mut Vec<Block::Extrinsic>
-		) -> error::Result<()> where T: BlockBuilderApi<Block> {
+		) -> error::Result<()> where T: BlockBuilderApi<Block, InherentData> {
 			api.map_api_result(|api| {
 				match api.apply_extrinsic(block_id, &xt)? {
 					Ok(ApplyOutcome::Success) | Ok(ApplyOutcome::Fail) => {