chain_spec.rs

use node_template_runtime::{AccountId, RuntimeGenesisConfig, Signature, WASM_BINARY};
use sc_service::ChainType;
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/";

/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
pub type ChainSpec = sc_service::GenericChainSpec<RuntimeGenesisConfig>;

/// 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> {
	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,
	))
	.build())
}

pub fn local_testnet_config() -> 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,
	))
	.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),
		},
	})
}