Introduce launcher

[zhangsoledad]

this PR mainly simplified the launch code

ckb/ckb-bin/src/subcommand/run.rs

Lines 11 to 62 in 853eaf5

	pub fn run(args: RunArgs, version: Version, async_handle: Handle) -> Result<(), ExitCode> {
	deadlock_detection();
	info!("ckb version: {}", version);
	let mut launcher = Launcher::new(args, version, async_handle);
	let block_assembler_config = launcher.sanitize_block_assembler_config()?;
	let miner_enable = block_assembler_config.is_some();
	let exit_handler = DefaultExitHandler::default();
	launcher.migrate_guard()?;
	let (shared, table) = launcher.build_shared(block_assembler_config)?;
	// spawn freezer background process
	let _freezer = shared.spawn_freeze();
	setup_system_cell_cache(
	shared.consensus().genesis_block(),
	&shared.store().cell_provider(),
	);
	rayon::ThreadPoolBuilder::new()
	.thread_name(|i| format!("RayonGlobal-{}", i))
	.build_global()
	.expect("Init the global thread pool for rayon failed");
	ckb_memory_tracker::track_current_process(
	launcher.args.config.memory_tracker.interval,
	Some(shared.store().db().inner()),
	);
	launcher.check_assume_valid_target(&shared);
	let chain_controller = launcher.start_chain_service(&shared, table);
	let (network_controller, rpc_server) =
	launcher.start_network_and_rpc(&shared, chain_controller, &exit_handler, miner_enable);
	let exit_handler_clone = exit_handler.clone();
	ctrlc::set_handler(move || {
	exit_handler_clone.notify_exit();
	})
	.expect("Error setting Ctrl-C handler");
	exit_handler.wait_for_exit();
	info!("Finishing work, please wait...");
	drop(rpc_server);
	drop(network_controller);
	Ok(())
	}

[zhangsoledad]

bors r=yangby-cryptape,quake

[bors]

Build failed:

• continuous-integration/travis-ci/push

[zhangsoledad]

bors retry

[bors]

Build failed:

• continuous-integration/travis-ci/push

[zhangsoledad]

bors retry

[bors]

Build failed:

• continuous-integration/travis-ci/push

[yangby-cryptape]

bors r=yangby-cryptape,quake

[bors]

Build succeeded:

• continuous-integration/travis-ci/push