Initial: Offchain Workers (#1942)

* Refactor state-machine stuff.

* Fix tests.

* WiP

* WiP2

* Service support for offchain workers.

* Service support for offchain workers.

* Testing offchain worker.

* Initial version working.

* Pass side effects in call.

* Pass OffchainExt in context.

* Submit extrinsics to the pool.

* Support inherents.

* Insert to inherents pool.

* Inserting to the pool asynchronously.

* Add test to offchain worker.

* Implement convenience syntax for modules.

* Dispatching offchain worker through executive.

* Fix offchain test.

* Remove offchain worker from timestamp.

* Update Cargo.lock.

* Address review comments.

* Use latest patch version for futures.

* Add CLI parameter for offchain worker.

* Fix compilation.

* Fix test.

* Fix extrinsics format for tests.

* Fix RPC test.

* Bump spec version.

* Fix executive.

* Fix support macro.

* Address grumbles.

* Bump runtime

substrate/core/test-runtime/src/lib.rs

@@ -94,6 +94,7 @@ impl Transfer {
 pub enum Extrinsic {
 	AuthoritiesChange(Vec<AuthorityId>),
 	Transfer(Transfer, AccountSignature),
+	IncludeData(Vec<u8>),
 }
 
 #[cfg(feature = "std")]
@@ -117,6 +118,7 @@ impl BlindCheckable for Extrinsic {
 					Err(runtime_primitives::BAD_SIGNATURE)
 				}
 			},
+			Extrinsic::IncludeData(data) => Ok(Extrinsic::IncludeData(data)),
 		}
 	}
 }
@@ -377,6 +379,13 @@ cfg_if! {
 			impl consensus_aura::AuraApi<Block> for Runtime {
 				fn slot_duration() -> u64 { 1 }
 			}
+
+			impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+				fn offchain_worker(block: u64) {
+					let ex = Extrinsic::IncludeData(block.encode());
+					runtime_io::submit_extrinsic(&ex)
+				}
+			}
 		}
 	} else {
 		impl_runtime_apis! {
@@ -480,6 +489,13 @@ cfg_if! {
 			impl consensus_aura::AuraApi<Block> for Runtime {
 				fn slot_duration() -> u64 { 1 }
 			}
+
+			impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+				fn offchain_worker(block: u64) {
+					let ex = Extrinsic::IncludeData(block.encode());
+					runtime_io::submit_extrinsic(&ex)
+				}
+			}
 		}
 	}
 }