Migration testing runtime API/Bot (#8038)

* A clean new attempt

* Checkpoint to move remote.

* A lot of dependency wiring to make it feature gated.

* bad macro, bad macro.

* Undo the DB mess.

* Update frame/support/src/traits.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* Apply suggestions from code review

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* unbreak the build

* Update frame/try-runtime/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update utils/frame/try-runtime/cli/Cargo.toml

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/try-runtime/Cargo.toml

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Address most review grumbles.

* Fix build

* Add some comments

* Remove allowing one pallet at a time.

* More grumbles.

* relocate remote-ext

* Fix build

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/bin/node/cli/src/cli.rs

@@ -47,6 +47,11 @@ pub enum Subcommand {
 	#[structopt(name = "benchmark", about = "Benchmark runtime pallets.")]
 	Benchmark(frame_benchmarking_cli::BenchmarkCmd),
 
+	/// Try some experimental command on the runtime. This includes migration and runtime-upgrade
+	/// testing.
+	#[cfg(feature = "try-runtime")]
+	TryRuntime(try_runtime_cli::TryRuntimeCmd),
+
 	/// Verify a signature for a message, provided on STDIN, with a given (public or secret) key.
 	Verify(VerifyCmd),
 

substrate/bin/node/cli/src/command.rs

@@ -149,5 +149,20 @@ pub fn run() -> Result<()> {
 				Ok((cmd.run(client, backend), task_manager))
 			})
 		},
+		#[cfg(feature = "try-runtime")]
+		Some(Subcommand::TryRuntime(cmd)) => {
+			let runner = cli.create_runner(cmd)?;
+			runner.async_run(|config| {
+				// we don't need any of the components of new_partial, just a runtime, or a task
+				// manager to do `async_run`.
+				let registry = config.prometheus_config.as_ref().map(|cfg| &cfg.registry);
+				let task_manager = sc_service::TaskManager::new(
+					config.task_executor.clone(),
+					registry,
+				).unwrap();
+
+				Ok((cmd.run::<Block, Executor>(config), task_manager))
+			})
+		}
 	}
 }