Collator node workflow (#280)

* arbitrary application logic in CLI

* collation work

* split up exit and work futures in application

* collation node workflow

* typo

* indentation fix

* doc grumbles

* rename Application to Worker

* refactor Worker::exit to exit_only

substrate/polkadot/consensus/src/collation.rs

@@ -23,18 +23,10 @@ use std::sync::Arc;
 
 use polkadot_api::PolkadotApi;
 use polkadot_primitives::{Hash, AccountId, BlockId};
-use polkadot_primitives::parachain::{Id as ParaId, BlockData, Extrinsic, CandidateReceipt};
+use polkadot_primitives::parachain::{Id as ParaId, Collation, Extrinsic};
 
 use futures::prelude::*;
 
-/// A full collation.
-pub struct Collation {
-	/// Block data.
-	pub block_data: BlockData,
-	/// The candidate receipt itself.
-	pub receipt: CandidateReceipt,
-}
-
 /// Encapsulates connections to collators and allows collation on any parachain.
 ///
 /// This is expected to be a lightweight, shared type like an `Arc`.

substrate/polkadot/consensus/src/lib.rs

@@ -32,7 +32,6 @@
 extern crate ed25519;
 extern crate parking_lot;
 extern crate polkadot_api;
-extern crate polkadot_collator as collator;
 extern crate polkadot_statement_table as table;
 extern crate polkadot_parachain as parachain;
 extern crate polkadot_transaction_pool as transaction_pool;
@@ -79,7 +78,7 @@ use futures::future;
 use collation::CollationFetch;
 use dynamic_inclusion::DynamicInclusion;
 
-pub use self::collation::{validate_collation, Collators, Collation};
+pub use self::collation::{validate_collation, Collators};
 pub use self::error::{ErrorKind, Error};
 pub use self::shared_table::{SharedTable, StatementProducer, ProducedStatements, Statement, SignedStatement, GenericStatement};
 pub use service::Service;

substrate/polkadot/consensus/src/shared_table/mod.rs

@@ -21,9 +21,8 @@ use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 
 use table::{self, Table, Context as TableContextTrait};
-use collation::Collation;
 use polkadot_primitives::{Hash, SessionKey};
-use polkadot_primitives::parachain::{Id as ParaId, BlockData, Extrinsic, CandidateReceipt};
+use polkadot_primitives::parachain::{Id as ParaId, BlockData, Collation, Extrinsic, CandidateReceipt};
 
 use parking_lot::Mutex;
 use futures::{future, prelude::*};
@@ -470,6 +469,7 @@ mod tests {
 		let candidate = CandidateReceipt {
 			parachain_index: para_id,
 			collator: [1; 32].into(),
+			signature: Default::default(),
 			head_data: ::polkadot_primitives::parachain::HeadData(vec![1, 2, 3, 4]),
 			balance_uploads: Vec::new(),
 			egress_queue_roots: Vec::new(),
@@ -519,6 +519,7 @@ mod tests {
 		let candidate = CandidateReceipt {
 			parachain_index: para_id,
 			collator: [1; 32].into(),
+			signature: Default::default(),
 			head_data: ::polkadot_primitives::parachain::HeadData(vec![1, 2, 3, 4]),
 			balance_uploads: Vec::new(),
 			egress_queue_roots: Vec::new(),