Telemetry (Slog + WS) (#217)

* Merge remote-tracking branch 'origin/master' into gav-xts-dont-panic

* Update wasm.

* consensus, session and staking all panic-safe.

* Democracy doesn't panic in apply.

* Fix tests.

* Extra helper macro, council depanicked.

* Fix one test.

* Fix up all council tests. No panics!

* Council voting depanicked.

* Dispatch returns result.

* session & staking tests updated

* Fix democracy tests.

* Fix council tests.

* Fix up polkadot parachains in runtime

* Fix borked merge

* More Slicable support

Support general `Option` and array types.

* Basic storage types.

* Existential deposit for contract creation

* Basic implemnetation along with removals

* Fix tests.

* externalities builder fix.

* Tests.

* Fix up the runtime.

* Fix tests.

* Add generic `Address` type.

* Initial function integration of Address into Extrinsic.

* Fix build

* All tests compile.

* Fix (some) tests.

* Fix signing.

* Push error.

* transfer can accept Address

* Make Address generic over AccountIndex

* Fix test

* Make Council use Address for dispatch.

* Fix build

* Bend over backwards to support braindead derive.

* Repot some files.

* Fix tests.

* Fix grumbles

* Remove Default bound

* Fix build for new nightly.

* Make `apply_extrinsic` never panic, return useful Result.

* More merge hell

* Doesn't build, but might do soon

* Serde woes

* get substrate-runtime-staking compiling

* Polkadot builds again!

* Fix all build.

* Fix tests & binaries.

* Reserve some extra initial byte values of address for future format changes

* Make semantic of `ReservedBalance` clear.

* Fix panic handler.

* Integrate other balance transformations into the new model

Fix up staking tests.

* Fix runtime tests.

* Fix panic build.

* Tests for demonstrating interaction between balance types.

* Repot some runtime code

* Fix checkedblock in non-std builds

* Get rid of `DoLookup` phantom.

* Attempt to make transaction_pool work with lookups.

* Remove vscode settings

* New attempt at making transaction pool work.

* It builds again!

* --all builds

* Fix tests.

* New build.

* Test account nonce reset.

* polkadot transaction pool tests/framework.

* Initial draft (working).

* Address grumbles.

* Revert bad `map_or`

* Rebuild binaries, workaround.

* Avoid checking in vscode

* reconnecting, shared, slog

* CLI options for name and telemetry url

* ensure telemetry url imples enabled

* Avoid casting to usize early.

* Provide on-connect event for session message

* Better port

* heartbeat and some renaming

* transaction pool stuff

* minor renaming.

* report telemetry

* cleanups.

* Fix for previous cleanup

* Initial draft (working).

* Avoid checking in vscode

* reconnecting, shared, slog

* CLI options for name and telemetry url

* ensure telemetry url imples enabled

* Provide on-connect event for session message

* Better port

* heartbeat and some renaming

* transaction pool stuff

* minor renaming.

* report telemetry

* cleanups.

* Fix for previous cleanup

* Address grumble

* Final grumble and repot telemetry to substrate

* Fix comment

* Please build, travis...

polkadot/service/src/lib.rs

@@ -19,8 +19,8 @@
 
 extern crate futures;
 extern crate ed25519;
+extern crate clap;
 extern crate exit_future;
-extern crate parking_lot;
 extern crate tokio_timer;
 extern crate polkadot_primitives;
 extern crate polkadot_runtime;
@@ -40,9 +40,13 @@ extern crate tokio_core;
 extern crate substrate_client as client;
 extern crate substrate_client_db as client_db;
 
+#[macro_use]
+extern crate substrate_telemetry;
 #[macro_use]
 extern crate error_chain;
 #[macro_use]
+extern crate slog;	// needed until we can reexport `slog_info` from `substrate_telemetry`
+#[macro_use]
 extern crate log;
 #[macro_use]
 extern crate hex_literal;
@@ -71,7 +75,7 @@ use network::ManageNetwork;
 use exit_future::Signal;
 
 pub use self::error::{ErrorKind, Error};
-pub use config::{Configuration, Role, ChainSpec};
+pub use config::{Configuration, Role, OptionChainSpec, ChainSpec};
 
 type CodeExecutor = NativeExecutor<LocalDispatch>;
 
@@ -410,7 +414,8 @@ impl<B, E> Service<B, E>
 		let (client, on_demand) = client_creator(db_settings, executor, genesis_builder)?;
 		let api = api_creator(client.clone());
 		let best_header = client.best_block_header()?;
-		info!("Starting Polkadot. Best block is #{}", best_header.number);
+		info!("Best block is #{}", best_header.number);
+		telemetry!("node.start"; "height" => best_header.number, "best" => ?best_header.hash());
 		let transaction_pool = Arc::new(TransactionPool::new(config.transaction_pool));
 		let transaction_pool_adapter = Arc::new(TransactionPoolAdapter {
 			pool: transaction_pool.clone(),
@@ -430,6 +435,7 @@ impl<B, E> Service<B, E>
 		let barrier = ::std::sync::Arc::new(Barrier::new(2));
 		on_demand.map(|on_demand| on_demand.set_service_link(Arc::downgrade(&network)));
 
+
 		let thread = {
 			let client = client.clone();
 			let network = network.clone();
@@ -445,11 +451,11 @@ impl<B, E> Service<B, E>
 				// block notifications
 				let network1 = network.clone();
 				let txpool1 = txpool.clone();
+
 				let events = client.import_notification_stream()
 					.for_each(move |notification| {
 						network1.on_block_imported(notification.hash, &notification.header);
 						prune_imported(&*api, &*txpool1, notification.hash);
-
 						Ok(())
 					});
 				core.handle().spawn(events);