templates: add genesis config presets for minimal/solochain (#5868)

# Description

Closes [#5790](#5790).
Useful for starting nodes based on minimal/solochain when doing
development or for testing omni node with less happy code paths. It is
reusing the presets defined for the nodes chain specs.

## Integration

Specifically useful for development/testing if generating chain-specs
for `minimal` or `solochain` runtimes from `templates` directories.

## Review Notes

Added `genesis_config_presets` modules for both minimal/solochain. I
reused the presets defined in each node `chain_spec` module
correspondingly.

### PRDOC

Not sure who uses templates, maybe node devs and runtime devs at start
of their learning journey, but happy to get some guidance on how to
write the prdoc if needed.

### Thinking out loud

I saw concerns around sharing functionality for such genesis config
presets between the template chains. I think there might be a case for
doing that, on the lines of this comment:
#4739 (comment).
I would add that `parachains-common::genesis_config_heleper` contains a
few methods from those mentioned, but I am unsure if using it as a
dependency for templates is correct. Feels like the comment suggests
there should be a `commons` crate concerning just `templates`, which I
agree with to some degree, if we assume `cumulus` needs might be driven
in certain directions that are not relevant to `templates` and vice
versa. However I am not so certain about this, so would welcome some
thoughts, since I am seeing `parachains-common` being used already in a
few runtime implementations:
https://crates.io/crates/parachains-common/reverse_dependencies?page=3,
so might be a good candidate already for the `common` logic.

---------

Signed-off-by: Iulian Barbu <iulian.barbu@parity.io>

templates/minimal/node/src/chain_spec.rs

@@ -15,13 +15,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use minimal_template_runtime::{BalancesConfig, SudoConfig, WASM_BINARY};
+use minimal_template_runtime::WASM_BINARY;
 use polkadot_sdk::{
 	sc_service::{ChainType, Properties},
-	sp_keyring::AccountKeyring,
 	*,
 };
-use serde_json::{json, Value};
 
 /// This is a specialization of the general Substrate ChainSpec type.
 pub type ChainSpec = sc_service::GenericChainSpec;
@@ -33,26 +31,12 @@ fn props() -> Properties {
 	properties
 }
 
-pub fn development_config() -> Result<ChainSpec, String> {
+pub fn development_chain_spec() -> Result<ChainSpec, String> {
 	Ok(ChainSpec::builder(WASM_BINARY.expect("Development wasm not available"), Default::default())
 		.with_name("Development")
 		.with_id("dev")
 		.with_chain_type(ChainType::Development)
-		.with_genesis_config_patch(testnet_genesis())
+		.with_genesis_config_preset_name(sp_genesis_builder::DEV_RUNTIME_PRESET)
 		.with_properties(props())
 		.build())
 }
-
-/// Configure initial storage state for FRAME pallets.
-fn testnet_genesis() -> Value {
-	use minimal_template_runtime::interface::{Balance, MinimumBalance};
-	use polkadot_sdk::polkadot_sdk_frame::traits::Get;
-	let endowment = <MinimumBalance as Get<Balance>>::get().max(1) * 1000;
-	let balances = AccountKeyring::iter()
-		.map(|a| (a.to_account_id(), endowment))
-		.collect::<Vec<_>>();
-	json!({
-		"balances": BalancesConfig { balances },
-		"sudo": SudoConfig { key: Some(AccountKeyring::Alice.to_account_id()) },
-	})
-}

templates/minimal/node/src/command.rs

@@ -49,7 +49,7 @@ impl SubstrateCli for Cli {
 
 	fn load_spec(&self, id: &str) -> Result<Box<dyn sc_service::ChainSpec>, String> {
 		Ok(match id {
-			"dev" => Box::new(chain_spec::development_config()?),
+			"dev" => Box::new(chain_spec::development_chain_spec()?),
 			path =>
 				Box::new(chain_spec::ChainSpec::from_json_file(std::path::PathBuf::from(path))?),
 		})

templates/minimal/runtime/Cargo.toml

@@ -21,6 +21,7 @@ polkadot-sdk = { workspace = true, features = [
 	"pallet-transaction-payment-rpc-runtime-api",
 	"runtime",
 ] }
+serde_json = { workspace = true, default-features = false, features = ["alloc"] }
 
 # local pallet templates
 pallet-minimal-template = { workspace = true }
@@ -37,4 +38,5 @@ std = [
 	"pallet-minimal-template/std",
 	"polkadot-sdk/std",
 	"scale-info/std",
+	"serde_json/std",
 ]

templates/minimal/runtime/src/lib.rs

@@ -25,7 +25,7 @@ include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
 
 extern crate alloc;
 
-use alloc::{vec, vec::Vec};
+use alloc::vec::Vec;
 use pallet_transaction_payment::{FeeDetails, RuntimeDispatchInfo};
 use polkadot_sdk::{
 	polkadot_sdk_frame::{
@@ -36,6 +36,54 @@ use polkadot_sdk::{
 	*,
 };
 
+/// Provides getters for genesis configuration presets.
+pub mod genesis_config_presets {
+	use crate::{
+		interface::{Balance, MinimumBalance},
+		sp_genesis_builder::PresetId,
+		sp_keyring::AccountKeyring,
+		BalancesConfig, RuntimeGenesisConfig, SudoConfig,
+	};
+
+	use alloc::{vec, vec::Vec};
+	use polkadot_sdk::{sp_core::Get, sp_genesis_builder};
+	use serde_json::Value;
+
+	/// Returns a development genesis config preset.
+	pub fn development_config_genesis() -> Value {
+		let endowment = <MinimumBalance as Get<Balance>>::get().max(1) * 1000;
+		let config = RuntimeGenesisConfig {
+			balances: BalancesConfig {
+				balances: AccountKeyring::iter()
+					.map(|a| (a.to_account_id(), endowment))
+					.collect::<Vec<_>>(),
+			},
+			sudo: SudoConfig { key: Some(AccountKeyring::Alice.to_account_id()) },
+			..Default::default()
+		};
+
+		serde_json::to_value(config).expect("Could not build genesis config.")
+	}
+
+	/// Get the set of the available genesis config presets.
+	pub fn get_preset(id: &PresetId) -> Option<Vec<u8>> {
+		let patch = match id.try_into() {
+			Ok(sp_genesis_builder::DEV_RUNTIME_PRESET) => development_config_genesis(),
+			_ => return None,
+		};
+		Some(
+			serde_json::to_string(&patch)
+				.expect("serialization to json is expected to work. qed.")
+				.into_bytes(),
+		)
+	}
+
+	/// List of supported presets.
+	pub fn preset_names() -> Vec<PresetId> {
+		vec![PresetId::from(sp_genesis_builder::DEV_RUNTIME_PRESET)]
+	}
+}
+
 /// The runtime version.
 #[runtime_version]
 pub const VERSION: RuntimeVersion = RuntimeVersion {
@@ -272,11 +320,11 @@ impl_runtime_apis! {
 		}
 
 		fn get_preset(id: &Option<sp_genesis_builder::PresetId>) -> Option<Vec<u8>> {
-			get_preset::<RuntimeGenesisConfig>(id, |_| None)
+			get_preset::<RuntimeGenesisConfig>(id, self::genesis_config_presets::get_preset)
 		}
 
 		fn preset_names() -> Vec<sp_genesis_builder::PresetId> {
-			vec![]
+			self::genesis_config_presets::preset_names()
 		}
 	}
 }

templates/parachain/node/src/chain_spec.rs

@@ -24,7 +24,7 @@ impl Extensions {
 	}
 }
 
-pub fn development_config() -> ChainSpec {
+pub fn development_chain_spec() -> ChainSpec {
 	// Give your base currency a unit name and decimal places
 	let mut properties = sc_chain_spec::Properties::new();
 	properties.insert("tokenSymbol".into(), "UNIT".into());
@@ -46,7 +46,7 @@ pub fn development_config() -> ChainSpec {
 	.build()
 }
 
-pub fn local_testnet_config() -> ChainSpec {
+pub fn local_chain_spec() -> ChainSpec {
 	// Give your base currency a unit name and decimal places
 	let mut properties = sc_chain_spec::Properties::new();
 	properties.insert("tokenSymbol".into(), "UNIT".into());

templates/parachain/node/src/command.rs

@@ -17,9 +17,9 @@ use crate::{
 
 fn load_spec(id: &str) -> std::result::Result<Box<dyn ChainSpec>, String> {
 	Ok(match id {
-		"dev" => Box::new(chain_spec::development_config()),
-		"template-rococo" => Box::new(chain_spec::local_testnet_config()),
-		"" | "local" => Box::new(chain_spec::local_testnet_config()),
+		"dev" => Box::new(chain_spec::development_chain_spec()),
+		"template-rococo" => Box::new(chain_spec::local_chain_spec()),
+		"" | "local" => Box::new(chain_spec::local_chain_spec()),
 		path => Box::new(chain_spec::ChainSpec::from_json_file(std::path::PathBuf::from(path))?),
 	})
 }

templates/parachain/runtime/Cargo.toml

@@ -27,7 +27,7 @@ scale-info = { features = [
 ], workspace = true }
 smallvec = { workspace = true, default-features = true }
 docify = { workspace = true }
-serde_json = { workspace = true, default-features = false }
+serde_json = { workspace = true, default-features = false, features = ["alloc"] }
 
 # Local
 pallet-parachain-template = { workspace = true }

templates/solochain/node/Cargo.toml

@@ -35,6 +35,7 @@ sp-consensus-aura = { workspace = true, default-features = true }
 sc-consensus = { workspace = true, default-features = true }
 sc-consensus-grandpa = { workspace = true, default-features = true }
 sp-consensus-grandpa = { workspace = true, default-features = true }
+sp-genesis-builder = { workspace = true, default-features = true }
 sc-client-api = { workspace = true, default-features = true }
 sc-basic-authorship = { workspace = true, default-features = true }
 
@@ -66,9 +67,7 @@ substrate-build-script-utils = { workspace = true, default-features = true }
 
 [features]
 default = ["std"]
-std = [
-	"solochain-template-runtime/std",
-]
+std = ["solochain-template-runtime/std"]
 # Dependencies that are only required if runtime benchmarking should be build.
 runtime-benchmarks = [
 	"frame-benchmarking-cli/runtime-benchmarks",

templates/solochain/node/src/chain_spec.rs

@@ -1,117 +1,29 @@
 use sc_service::ChainType;
-use solochain_template_runtime::{AccountId, Signature, WASM_BINARY};
-use sp_consensus_aura::sr25519::AuthorityId as AuraId;
-use sp_consensus_grandpa::AuthorityId as GrandpaId;
-use sp_core::{sr25519, Pair, Public};
-use sp_runtime::traits::{IdentifyAccount, Verify};
-
-// The URL for the telemetry server.
-// const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+use solochain_template_runtime::WASM_BINARY;
 
 /// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
 pub type ChainSpec = sc_service::GenericChainSpec;
 
-/// Generate a crypto pair from seed.
-pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
-	TPublic::Pair::from_string(&format!("//{}", seed), None)
-		.expect("static values are valid; qed")
-		.public()
-}
-
-type AccountPublic = <Signature as Verify>::Signer;
-
-/// Generate an account ID from seed.
-pub fn get_account_id_from_seed<TPublic: Public>(seed: &str) -> AccountId
-where
-	AccountPublic: From<<TPublic::Pair as Pair>::Public>,
-{
-	AccountPublic::from(get_from_seed::<TPublic>(seed)).into_account()
-}
-
-/// Generate an Aura authority key.
-pub fn authority_keys_from_seed(s: &str) -> (AuraId, GrandpaId) {
-	(get_from_seed::<AuraId>(s), get_from_seed::<GrandpaId>(s))
-}
-
-pub fn development_config() -> Result<ChainSpec, String> {
+pub fn development_chain_spec() -> Result<ChainSpec, String> {
 	Ok(ChainSpec::builder(
 		WASM_BINARY.ok_or_else(|| "Development wasm not available".to_string())?,
 		None,
 	)
 	.with_name("Development")
 	.with_id("dev")
 	.with_chain_type(ChainType::Development)
-	.with_genesis_config_patch(testnet_genesis(
-		// Initial PoA authorities
-		vec![authority_keys_from_seed("Alice")],
-		// Sudo account
-		get_account_id_from_seed::<sr25519::Public>("Alice"),
-		// Pre-funded accounts
-		vec![
-			get_account_id_from_seed::<sr25519::Public>("Alice"),
-			get_account_id_from_seed::<sr25519::Public>("Bob"),
-			get_account_id_from_seed::<sr25519::Public>("Alice//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Bob//stash"),
-		],
-		true,
-	))
+	.with_genesis_config_preset_name(sp_genesis_builder::DEV_RUNTIME_PRESET)
 	.build())
 }
 
-pub fn local_testnet_config() -> Result<ChainSpec, String> {
+pub fn local_chain_spec() -> Result<ChainSpec, String> {
 	Ok(ChainSpec::builder(
 		WASM_BINARY.ok_or_else(|| "Development wasm not available".to_string())?,
 		None,
 	)
 	.with_name("Local Testnet")
 	.with_id("local_testnet")
 	.with_chain_type(ChainType::Local)
-	.with_genesis_config_patch(testnet_genesis(
-		// Initial PoA authorities
-		vec![authority_keys_from_seed("Alice"), authority_keys_from_seed("Bob")],
-		// Sudo account
-		get_account_id_from_seed::<sr25519::Public>("Alice"),
-		// Pre-funded accounts
-		vec![
-			get_account_id_from_seed::<sr25519::Public>("Alice"),
-			get_account_id_from_seed::<sr25519::Public>("Bob"),
-			get_account_id_from_seed::<sr25519::Public>("Charlie"),
-			get_account_id_from_seed::<sr25519::Public>("Dave"),
-			get_account_id_from_seed::<sr25519::Public>("Eve"),
-			get_account_id_from_seed::<sr25519::Public>("Ferdie"),
-			get_account_id_from_seed::<sr25519::Public>("Alice//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Bob//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Charlie//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Dave//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Eve//stash"),
-			get_account_id_from_seed::<sr25519::Public>("Ferdie//stash"),
-		],
-		true,
-	))
+	.with_genesis_config_preset_name(sp_genesis_builder::LOCAL_TESTNET_RUNTIME_PRESET)
 	.build())
 }
-
-/// Configure initial storage state for FRAME modules.
-fn testnet_genesis(
-	initial_authorities: Vec<(AuraId, GrandpaId)>,
-	root_key: AccountId,
-	endowed_accounts: Vec<AccountId>,
-	_enable_println: bool,
-) -> serde_json::Value {
-	serde_json::json!({
-		"balances": {
-			// Configure endowed accounts with initial balance of 1 << 60.
-			"balances": endowed_accounts.iter().cloned().map(|k| (k, 1u64 << 60)).collect::<Vec<_>>(),
-		},
-		"aura": {
-			"authorities": initial_authorities.iter().map(|x| (x.0.clone())).collect::<Vec<_>>(),
-		},
-		"grandpa": {
-			"authorities": initial_authorities.iter().map(|x| (x.1.clone(), 1)).collect::<Vec<_>>(),
-		},
-		"sudo": {
-			// Assign network admin rights.
-			"key": Some(root_key),
-		},
-	})
-}

templates/solochain/node/src/command.rs

@@ -37,8 +37,8 @@ impl SubstrateCli for Cli {
 
 	fn load_spec(&self, id: &str) -> Result<Box<dyn sc_service::ChainSpec>, String> {
 		Ok(match id {
-			"dev" => Box::new(chain_spec::development_config()?),
-			"" | "local" => Box::new(chain_spec::local_testnet_config()?),
+			"dev" => Box::new(chain_spec::development_chain_spec()?),
+			"" | "local" => Box::new(chain_spec::local_chain_spec()?),
 			path =>
 				Box::new(chain_spec::ChainSpec::from_json_file(std::path::PathBuf::from(path))?),
 		})

templates/solochain/runtime/Cargo.toml

@@ -20,6 +20,7 @@ scale-info = { features = [
 	"derive",
 	"serde",
 ], workspace = true }
+serde_json = { workspace = true, default-features = false, features = ["alloc"] }
 
 # frame
 frame-support = { features = ["experimental"], workspace = true }
@@ -45,6 +46,7 @@ sp-consensus-aura = { features = [
 sp-consensus-grandpa = { features = [
 	"serde",
 ], workspace = true }
+sp-keyring = { workspace = true }
 sp-core = { features = [
 	"serde",
 ], workspace = true }
@@ -114,6 +116,8 @@ std = [
 	"sp-transaction-pool/std",
 	"sp-version/std",
 
+	"serde_json/std",
+	"sp-keyring/std",
 	"substrate-wasm-builder",
 ]