Introduce srml/im-online (#3079)

* Fix grammar and typo

* Extend network service

* Extend offchain API

* Support creating unsigned UncheckedExtrinsic

* Introduce srml/im-online

* Bump impl and spec version

* Fix web-wasm test

* Apply suggestions from code review

Remove parity-multiaddr dependency

Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com>

* Replace transmute with from_raw_parts

* Replace PeerId.to_string() with .to_base58()

Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com>

* Update Cargo.lock

* Bump impl and spec version (again)

It was updated in master in the meantime.

* Apply suggestions from code review

Co-Authored-By: Sergei Pepyakin <sergei@parity.io>

* Address comments

* Add public function is_online_in_current_session()

* Bump spec_version

* Fix doc tests

* Improve comments

* Remove superfluous line

* Name parameters consistently

* Implement comments

* Switch From to TryFrom

* Use Vec instead of HashSet

* Fix tests

* Revert me: local testing

* Fix check if already sent during session

We gossip each session, hence we need to check
if already sent in this session (not era).

* Fix typos

* Consistent terminology

* Revert "Revert me: local testing"

This reverts commit 73fbc29ff3e5ed71d99436318260b4f007e837f4.

* Introduce IsMember trait

* Implement misc comments

* Remove unused function

* Fix test

* Fix external_addresses being written

* Fix test

* Add necessary trait bound

* Do not increment version

* Update lib.rs

substrate/core/service/src/lib.rs

@@ -37,7 +37,7 @@ use exit_future::Signal;
 use futures::prelude::*;
 use futures03::stream::{StreamExt as _, TryStreamExt as _};
 use keystore::Store as Keystore;
-use network::NetworkState;
+use network::{NetworkState, NetworkStateInfo};
 use log::{info, warn, debug, error};
 use parity_codec::{Encode, Decode};
 use primitives::{Pair, ed25519, crypto};
@@ -293,6 +293,7 @@ impl<Components: components::Components> Service<Components> {
 			let wclient = Arc::downgrade(&client);
 			let offchain = offchain_workers.as_ref().map(Arc::downgrade);
 			let to_spawn_tx_ = to_spawn_tx.clone();
+			let network_state_info: Arc<dyn NetworkStateInfo + Send + Sync> = network.clone();
 
 			let events = client.import_notification_stream()
 				.map(|v| Ok::<_, ()>(v)).compat()
@@ -312,6 +313,7 @@ impl<Components: components::Components> Service<Components> {
 							&number,
 							&offchain,
 							&txpool,
+							&network_state_info,
 						).map_err(|e| warn!("Offchain workers error processing new block: {:?}", e))?;
 						let _ = to_spawn_tx_.unbounded_send(future);
 					}