Make wasm runtime cache size configurable (#10177)

* Make wasm runtime cache size configurable

* apply review comments

* remove VersionedRuntimeValue

* fix compilation

* VersionedRuntime: replace clone by Arc

* fmt

* fix warnings

* fix tests compilation

* fmt

substrate/client/cli/src/commands/run_cmd.rs

@@ -238,6 +238,10 @@ pub struct RunCmd {
 	#[structopt(long)]
 	pub max_runtime_instances: Option<usize>,
 
+	/// Maximum number of different runtimes that can be cached.
+	#[structopt(long, default_value = "2")]
+	pub runtime_cache_size: u8,
+
 	/// Run a temporary node.
 	///
 	/// A temporary directory will be created to store the configuration and will be deleted
@@ -453,6 +457,10 @@ impl CliConfiguration for RunCmd {
 		Ok(self.max_runtime_instances.map(|x| x.min(256)))
 	}
 
+	fn runtime_cache_size(&self) -> Result<u8> {
+		Ok(self.runtime_cache_size)
+	}
+
 	fn base_path(&self) -> Result<Option<BasePath>> {
 		Ok(if self.tmp {
 			Some(BasePath::new_temp_dir()?)

substrate/client/cli/src/config.rs

@@ -452,6 +452,13 @@ pub trait CliConfiguration<DCV: DefaultConfigurationValues = ()>: Sized {
 		Ok(Default::default())
 	}
 
+	/// Get maximum different runtimes in cache
+	///
+	/// By default this is `2`.
+	fn runtime_cache_size(&self) -> Result<u8> {
+		Ok(2)
+	}
+
 	/// Activate or not the automatic announcing of blocks after import
 	///
 	/// By default this is `false`.
@@ -482,6 +489,7 @@ pub trait CliConfiguration<DCV: DefaultConfigurationValues = ()>: Sized {
 		let is_validator = role.is_authority();
 		let (keystore_remote, keystore) = self.keystore_config(&config_dir)?;
 		let telemetry_endpoints = self.telemetry_endpoints(&chain_spec)?;
+		let runtime_cache_size = self.runtime_cache_size()?;
 
 		let unsafe_pruning = self.import_params().map(|p| p.unsafe_pruning).unwrap_or(false);
 
@@ -534,6 +542,7 @@ pub trait CliConfiguration<DCV: DefaultConfigurationValues = ()>: Sized {
 			role,
 			base_path: Some(base_path),
 			informant_output_format: Default::default(),
+			runtime_cache_size,
 		})
 	}