Tagged transaction queue integration (#893)

* Make the graph generic.

* Adapting pool API for the graph.

* Merge pool & graph.

* Restructure.

* Fix test of transaction pool.

* Get rid of node/transaction-pool.

* Compilation fixes.

* Test7

* Fix compilation of tests.

* Revert runtime changes.

* Add validate_transaction to test-runtime.

* Fix RPC tests.

* Add clearing of the old transactions.

* Trigger pool events.

* Use new queue API.

* Fix wasm build, re-export Hasher.

* No warning if validate transaction fails.

* Get rid of Into<u64> and use As

substrate/core/transaction-pool/graph/src/lib.rs

@@ -0,0 +1,53 @@
+// Copyright 2018 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+// tag::description[]
+//! Generic Transaction Pool
+//!
+//! The pool is based on dependency graph between transactions
+//! and their priority.
+//! The pool is able to return an iterator that traverses transaction
+//! graph in the correct order taking into account priorities and dependencies.
+//!
+//! TODO [ToDr]
+//! - [ ] Longevity handling (remove obsolete transactions periodically)
+//! - [ ] Multi-threading (getting ready transactions should not block the pool)
+// end::description[]
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+extern crate futures;
+extern crate parking_lot;
+extern crate sr_primitives;
+
+#[macro_use] extern crate error_chain;
+#[macro_use] extern crate log;
+#[macro_use] extern crate serde_derive;
+
+mod future;
+mod listener;
+mod pool;
+mod ready;
+mod rotator;
+
+pub mod base_pool;
+pub mod error;
+pub mod watcher;
+
+pub use self::error::IntoPoolError;
+pub use self::base_pool::{Transaction, Status};
+pub use self::pool::{Pool, Options, ChainApi, EventStream, ExtrinsicFor, BlockHash, ExHash, NumberFor, TransactionFor};