serai/substrate/runtime/src/wasm/mod.rs

use core::marker::PhantomData;
use alloc::{borrow::Cow, vec, vec::Vec};

use sp_core::{ConstU32, ConstU64, sr25519::Public};
use sp_runtime::{
  Perbill, Weight,
  traits::{Header as _, Block as _},
};
use sp_version::RuntimeVersion;

use serai_abi::{
  primitives::{
    crypto::EmbeddedEllipticCurveKeys,
    network_id::{ExternalNetworkId, NetworkId},
    balance::{Amount, ExternalBalance},
    validator_sets::{Session, ExternalValidatorSet, ValidatorSet},
    address::SeraiAddress,
  },
  SubstrateHeader as Header, SubstrateBlock as Block,
};

use serai_coins_pallet::{CoinsInstance, LiquidityTokensInstance};

/// The lookup for a SeraiAddress -> Public.
pub struct Lookup;
impl sp_runtime::traits::StaticLookup for Lookup {
  type Source = SeraiAddress;
  type Target = Public;
  fn lookup(source: SeraiAddress) -> Result<Public, sp_runtime::traits::LookupError> {
    Ok(source.into())
  }
  fn unlookup(source: Public) -> SeraiAddress {
    source.into()
  }
}

// TODO: Remove
#[sp_version::runtime_version]
pub const VERSION: RuntimeVersion = RuntimeVersion {
  spec_name: Cow::Borrowed("serai"),
  impl_name: Cow::Borrowed("core"),
  authoring_version: 0,
  spec_version: 0,
  impl_version: 0,
  apis: RUNTIME_API_VERSIONS,
  transaction_version: 0,
  system_version: 0,
};

frame_support::parameter_types! {
  pub const Version: RuntimeVersion = VERSION;

  // TODO
  pub BlockLength: frame_system::limits::BlockLength =
    frame_system::limits::BlockLength::max_with_normal_ratio(
      100 * 1024,
      Perbill::from_percent(75),
    );
  // TODO
  pub BlockWeights: frame_system::limits::BlockWeights =
    frame_system::limits::BlockWeights::with_sensible_defaults(
      Weight::from_parts(
        2u64 * frame_support::weights::constants::WEIGHT_REF_TIME_PER_SECOND,
        u64::MAX,
      ),
      Perbill::from_percent(75),
    );
}

#[frame_support::runtime]
mod runtime {
  use super::*;

  #[runtime::runtime]
  #[runtime::derive(RuntimeCall, RuntimeEvent, RuntimeError, RuntimeOrigin)]
  pub struct Runtime;

  #[runtime::pallet_index(0)]
  pub type System = frame_system::Pallet<Runtime>;

  #[runtime::pallet_index(1)]
  pub type Core = serai_core_pallet::Pallet<Runtime>;

  #[runtime::pallet_index(2)]
  pub type Coins = serai_coins_pallet::Pallet<Runtime, CoinsInstance>;

  #[runtime::pallet_index(3)]
  pub type ValidatorSets = serai_validator_sets_pallet::Pallet<Runtime>;

  #[runtime::pallet_index(4)]
  pub type Signals = serai_signals_pallet::Pallet<Runtime>;

  #[runtime::pallet_index(5)]
  pub type LiquidityTokens = serai_coins_pallet::Pallet<Runtime, LiquidityTokensInstance>;

  #[runtime::pallet_index(6)]
  pub type Dex = serai_dex_pallet::Pallet<Runtime>;

  #[runtime::pallet_index(0xfd)]
  #[runtime::disable_inherent]
  pub type Timestamp = pallet_timestamp::Pallet<Runtime>;

  #[runtime::pallet_index(0xfe)]
  pub type Babe = pallet_babe::Pallet<Runtime>;

  #[runtime::pallet_index(0xff)]
  pub type Grandpa = pallet_grandpa::Pallet<Runtime>;
}

impl frame_system::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
  type BaseCallFilter = frame_support::traits::Everything;
  type BlockWeights = BlockWeights;
  type BlockLength = BlockLength;
  type RuntimeOrigin = RuntimeOrigin;
  type RuntimeCall = RuntimeCall;
  type Nonce = u32;
  type Hash = <Self::Block as sp_runtime::traits::Block>::Hash;
  type Hashing = sp_runtime::traits::BlakeTwo256;
  type AccountId = sp_core::sr25519::Public;
  type Lookup = Lookup;
  type Block = Block;
  // Don't track old block hashes within the System pallet
  // We use not a number -> hash index, but a hash -> () index, in our own pallet
  type BlockHashCount = ConstU64<1>;
  type DbWeight = frame_support::weights::constants::RocksDbWeight;
  type Version = Version;
  type PalletInfo = PalletInfo;
  type AccountData = ();
  type OnNewAccount = ();
  type OnKilledAccount = ();
  // We use the default weights as we never expose/call any of these methods
  type SystemWeightInfo = ();
  // We also don't use the provided extensions framework
  type ExtensionsWeightInfo = ();
  // We don't invoke any hooks on-set-code as we don't perform upgrades via the blockchain yet via
  // nodes, ensuring everyone who upgrades consents to the rules they upgrade to
  type OnSetCode = ();
  type MaxConsumers = ConstU32<{ u32::MAX }>;
  // No migrations set
  type SingleBlockMigrations = ();
  type MultiBlockMigrator = ();

  type PreInherents = serai_core_pallet::StartOfBlock<Runtime>;
  type PostInherents = ();
  type PostTransactions = serai_core_pallet::EndOfBlock<Runtime>;
}

impl serai_core_pallet::Config for Runtime {}

impl serai_coins_pallet::Config<CoinsInstance> for Runtime {
  type AllowMint = serai_coins_pallet::AlwaysAllowMint; // TODO
}

#[doc(hidden)]
pub struct EconomicSecurity; // TODO
impl serai_abi::economic_security::EconomicSecurity for EconomicSecurity {
  fn achieved_economic_security(_network: ExternalNetworkId) -> bool {
    false
  }
  fn sri_value(_balance: ExternalBalance) -> Amount {
    Amount(0)
  }
}
impl serai_validator_sets_pallet::Config for Runtime {
  type ShouldEndSession = Babe;
  type EconomicSecurity = EconomicSecurity;
}
impl serai_signals_pallet::Config for Runtime {
  type RetirementValidityDuration = ConstU64<0>; // TODO
  type RetirementLockInDuration = ConstU64<1>; // TODO
}
impl serai_coins_pallet::Config<LiquidityTokensInstance> for Runtime {
  type AllowMint = serai_coins_pallet::AlwaysAllowMint;
}
impl serai_dex_pallet::Config for Runtime {}

impl pallet_timestamp::Config for Runtime {
  type Moment = u64;
  type OnTimestampSet = Babe;
  // TODO
  type MinimumPeriod = ConstU64<{ (6 * 1000) / 2 }>;
  type WeightInfo = ();
}

// pallet-babe requires `pallet-session` for `GetCurrentSessionForSubstrate` but not it itself
// We ensure this by having patched `pallet-session` to omit the pallet
#[doc(hidden)]
pub struct GetCurrentSessionForSubstrate;
impl pallet_session::GetCurrentSessionForSubstrate for GetCurrentSessionForSubstrate {
  fn get() -> u32 {
    serai_validator_sets_pallet::Pallet::<Runtime>::current_session(NetworkId::Serai)
      .map(|session| session.0)
      .unwrap_or(0)
  }
}
impl pallet_session::Config for Runtime {
  type Session = GetCurrentSessionForSubstrate;
}

type MaxAuthorities =
  ConstU32<{ serai_abi::primitives::validator_sets::KeyShares::MAX_PER_SET_U32 }>;
impl pallet_babe::Config for Runtime {
  // TODO
  type EpochDuration = ConstU64<{ (7 * 24 * 60 * 60 * 1000) / (6 * 1000) }>;

  type ExpectedBlockTime = ConstU64<{ 6 * 1000 }>; // TODO
  type EpochChangeTrigger = pallet_babe::ExternalTrigger;

  type WeightInfo = ();
  type MaxAuthorities = MaxAuthorities;
  type MaxNominators = ConstU32<1>;

  // TODO: https://github.com/serai-dex/serai/issues/657
  type DisabledValidators = ();
  type KeyOwnerProof = sp_session::MembershipProof;
  type EquivocationReportSystem = ();
}
impl pallet_grandpa::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;

  type WeightInfo = ();
  type MaxAuthorities = MaxAuthorities;
  type MaxNominators = ConstU32<1>;

  // TODO: https://github.com/serai-dex/serai/issues/657
  type MaxSetIdSessionEntries = ConstU64<0>;
  type KeyOwnerProof = sp_session::MembershipProof;
  type EquivocationReportSystem = ();
}

impl From<Option<SeraiAddress>> for RuntimeOrigin {
  fn from(signer: Option<SeraiAddress>) -> Self {
    match signer {
      None => RuntimeOrigin::none(),
      Some(signer) => RuntimeOrigin::signed(signer.into()),
    }
  }
}

impl From<serai_abi::Call> for RuntimeCall {
  fn from(call: serai_abi::Call) -> Self {
    match call {
      serai_abi::Call::Coins(call) => {
        use serai_abi::coins::Call;
        use serai_coins_pallet::Call as Scall;
        RuntimeCall::Coins(match call {
          Call::transfer { to, coins } => Scall::transfer { to: to.into(), coins },
          Call::burn { coins } => Scall::burn { coins },
          Call::burn_with_instruction { instruction } => {
            Scall::burn_with_instruction { instruction }
          }
        })
      }
      serai_abi::Call::ValidatorSets(call) => {
        use serai_abi::validator_sets::Call;
        use serai_validator_sets_pallet::Call as Scall;
        RuntimeCall::ValidatorSets(match call {
          Call::set_keys { network, key_pair, signature_participants, signature } => {
            Scall::set_keys { network, key_pair, signature_participants, signature }
          }
          Call::report_slashes { network, slashes, signature } => {
            Scall::report_slashes { network, slashes, signature }
          }
          Call::set_embedded_elliptic_curve_keys { keys } => {
            Scall::set_embedded_elliptic_curve_keys { keys }
          }
          Call::allocate { network, amount } => Scall::allocate { network, amount },
          Call::deallocate { network, amount } => Scall::deallocate { network, amount },
          Call::claim_deallocation { deallocation } => Scall::claim_deallocation {
            network: deallocation.network,
            session: deallocation.session,
          },
        })
      }
      serai_abi::Call::Signals(call) => {
        use serai_abi::signals::Call;
        use serai_signals_pallet::Call as Scall;
        RuntimeCall::Signals(match call {
          Call::register_retirement_signal { in_favor_of } => {
            Scall::register_retirement_signal { in_favor_of }
          }
          Call::revoke_retirement_signal { was_in_favor_of } => {
            Scall::revoke_retirement_signal { retirement_signal: was_in_favor_of }
          }
          Call::favor { signal, with_network } => Scall::favor { signal, with_network },
          Call::revoke_favor { signal, with_network } => {
            Scall::revoke_favor { signal, with_network }
          }
          Call::stand_against { signal, with_network } => {
            Scall::stand_against { signal, with_network }
          }
        })
      }
      serai_abi::Call::Dex(call) => {
        use serai_abi::dex::Call;
        match call {
          Call::add_liquidity {
            external_coin,
            sri_intended,
            external_coin_intended,
            sri_minimum,
            external_coin_minimum,
          } => RuntimeCall::Dex(serai_dex_pallet::Call::add_liquidity {
            external_coin,
            sri_intended,
            external_coin_intended,
            sri_minimum,
            external_coin_minimum,
          }),
          Call::transfer_liquidity { to, liquidity_tokens } => {
            RuntimeCall::Dex(serai_dex_pallet::Call::transfer_liquidity { to, liquidity_tokens })
          }
          Call::remove_liquidity { liquidity_tokens, sri_minimum, external_coin_minimum } => {
            RuntimeCall::Dex(serai_dex_pallet::Call::remove_liquidity {
              liquidity_tokens,
              sri_minimum,
              external_coin_minimum,
            })
          }
          Call::swap { coins_to_swap, minimum_to_receive } => {
            RuntimeCall::Dex(serai_dex_pallet::Call::swap { coins_to_swap, minimum_to_receive })
          }
          Call::swap_for { coins_to_receive, maximum_to_swap } => {
            RuntimeCall::Dex(serai_dex_pallet::Call::swap_for { coins_to_receive, maximum_to_swap })
          }
        }
      }
      serai_abi::Call::GenesisLiquidity(call) => {
        use serai_abi::genesis_liquidity::Call;
        match call {
          Call::oraclize_values { .. } | Call::remove_liquidity { .. } => todo!("TODO"),
        }
      }
      serai_abi::Call::InInstructions(call) => {
        use serai_abi::in_instructions::Call;
        match call {
          Call::execute_batch { .. } => todo!("TODO"),
        }
      }
    }
  }
}

type Executive = frame_executive::Executive<Runtime, Block, Context, Runtime, AllPalletsWithSystem>;

const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
pub const BABE_GENESIS_EPOCH_CONFIG: sp_consensus_babe::BabeEpochConfiguration =
  sp_consensus_babe::BabeEpochConfiguration {
    c: PRIMARY_PROBABILITY,
    allowed_slots: sp_consensus_babe::AllowedSlots::PrimaryAndSecondaryPlainSlots,
  };

sp_api::impl_runtime_apis! {
  impl crate::GenesisApi<Block> for Runtime {
    fn build(genesis: crate::GenesisConfig) {
      let config = RuntimeGenesisConfig {
        system: SystemConfig { _config: PhantomData },

        coins: CoinsConfig {
          accounts: genesis.coins.into_iter().map(|(key, balance)| (key.into(), balance)).collect(),
          _instance: PhantomData,
        },

        liquidity_tokens: LiquidityTokensConfig { accounts: vec![], _instance: PhantomData },

        validator_sets: ValidatorSetsConfig {
          participants:
            genesis.validators.into_iter().map(|(key, keys)| (key.into(), keys)).collect(),
        },
        signals: SignalsConfig::default(),

        // We leave these `authorities` empty as `serai-validator-sets-pallet` initializes them
        babe: BabeConfig {
          authorities: vec![],
          epoch_config: BABE_GENESIS_EPOCH_CONFIG,
          _config: PhantomData,
        },
        grandpa: GrandpaConfig { authorities: vec![], _config: PhantomData },
      };

      Core::genesis(&config);
    }
  }

  impl sp_api::Core<Block> for Runtime {
    fn version() -> RuntimeVersion {
      VERSION
    }
    fn initialize_block(header: &Header) -> sp_runtime::ExtrinsicInclusionMode {
      Executive::initialize_block(header)
    }
    fn execute_block(block: Block) {
      Executive::execute_block(block);
    }
  }

  impl sp_block_builder::BlockBuilder<Block> for Runtime {
    fn apply_extrinsic(
      extrinsic: <Block as sp_runtime::traits::Block>::Extrinsic,
    ) -> sp_runtime::ApplyExtrinsicResult {
      Executive::apply_extrinsic(extrinsic)
    }

    fn finalize_block() -> Header {
      Executive::finalize_block()
    }

    fn inherent_extrinsics(
      data: sp_inherents::InherentData,
    ) -> Vec<<Block as sp_runtime::traits::Block>::Extrinsic> {
      data.create_extrinsics()
    }

    fn check_inherents(
      block: Block,
      data: sp_inherents::InherentData,
    ) -> sp_inherents::CheckInherentsResult {
      let mut result = data.check_extrinsics(&block);

      // Handle the `SeraiPreExecutionDigest`
      'outer: {
        use serai_abi::SeraiPreExecutionDigest;

        const INHERENT_ID: [u8; 8] = [
          SeraiPreExecutionDigest::CONSENSUS_ID[0],
          SeraiPreExecutionDigest::CONSENSUS_ID[1],
          SeraiPreExecutionDigest::CONSENSUS_ID[2],
          SeraiPreExecutionDigest::CONSENSUS_ID[3],
          0, 0, 0, 0
        ];

        for log in block.header().digest().logs() {
          match log {
            sp_runtime::DigestItem::PreRuntime(consensus, encoded)
              if *consensus == SeraiPreExecutionDigest::CONSENSUS_ID =>
            {
              let Ok(SeraiPreExecutionDigest { unix_time_in_millis }) =
                <_ as borsh::BorshDeserialize>::deserialize_reader(&mut encoded.as_slice()) else {
                // We don't handle this error as we can't in this position
                let _ = result.put_error(
                  INHERENT_ID,
                  &sp_inherents::MakeFatalError::from("invalid `SeraiPreExecutionDigest`"),
                );
                return result;
              };

              use frame_support::inherent::ProvideInherent;
              match pallet_timestamp::Pallet::<Runtime>::check_inherent(
                &pallet_timestamp::Call::<Runtime>::set { now: unix_time_in_millis },
                &data
              ) {
                Ok(()) => {},
                Err(e) => {
                  let _ = result.put_error(sp_timestamp::INHERENT_IDENTIFIER, &e);
                }
              }

              break 'outer;
            }
            _ => {}
          }
        }

        let _ = result.put_error(
          INHERENT_ID,
          &sp_inherents::MakeFatalError::from("missing `SeraiPreExecutionDigest`")
        );
      }

      result
    }
  }

  impl sp_transaction_pool::runtime_api::TaggedTransactionQueue<Block> for Runtime {
    fn validate_transaction(
      source: sp_runtime::transaction_validity::TransactionSource,
      tx: <Block as sp_runtime::traits::Block>::Extrinsic,
      block_hash: <Block as sp_runtime::traits::Block>::Hash,
    ) -> sp_runtime::transaction_validity::TransactionValidity {
      Executive::validate_transaction(source, tx, block_hash)
    }
  }

  impl sp_consensus_babe::BabeApi<Block> for Runtime {
    fn configuration() -> sp_consensus_babe::BabeConfiguration {
      use frame_support::traits::Get;

      let epoch_config = Babe::epoch_config().unwrap_or(BABE_GENESIS_EPOCH_CONFIG);
      sp_consensus_babe::BabeConfiguration {
        slot_duration: Babe::slot_duration(),
        epoch_length: <Runtime as pallet_babe::Config>::EpochDuration::get(),
        c: epoch_config.c,
        authorities: Babe::authorities().to_vec(),
        randomness: Babe::randomness(),
        allowed_slots: epoch_config.allowed_slots,
      }
    }

    fn current_epoch_start() -> sp_consensus_babe::Slot {
      Babe::current_epoch_start()
    }

    fn current_epoch() -> sp_consensus_babe::Epoch {
      Babe::current_epoch()
    }

    fn next_epoch() -> sp_consensus_babe::Epoch {
      Babe::next_epoch()
    }

    // TODO: Revisit
    fn generate_key_ownership_proof(
      _slot: sp_consensus_babe::Slot,
      _authority_id: sp_consensus_babe::AuthorityId,
    ) -> Option<sp_consensus_babe::OpaqueKeyOwnershipProof> {
      None
    }

    // TODO: Revisit
    fn submit_report_equivocation_unsigned_extrinsic(
      equivocation_proof: sp_consensus_babe::EquivocationProof<Header>,
      _: sp_consensus_babe::OpaqueKeyOwnershipProof,
    ) -> Option<()> {
      None
    }
  }

  impl sp_consensus_grandpa::GrandpaApi<Block> for Runtime {
    fn grandpa_authorities() -> sp_consensus_grandpa::AuthorityList {
      Grandpa::grandpa_authorities()
    }

    fn current_set_id() -> sp_consensus_grandpa::SetId {
      Grandpa::current_set_id()
    }

    // TODO: Revisit
    fn generate_key_ownership_proof(
      _set_id: sp_consensus_grandpa::SetId,
      _authority_id: sp_consensus_grandpa::AuthorityId,
    ) -> Option<sp_consensus_grandpa::OpaqueKeyOwnershipProof> {
      None
    }

    // TODO: Revisit
    fn submit_report_equivocation_unsigned_extrinsic(
      equivocation_proof: sp_consensus_grandpa::EquivocationProof<
        <Block as sp_runtime::traits::Block>::Hash,
        u64,
      >,
      _: sp_consensus_grandpa::OpaqueKeyOwnershipProof,
    ) -> Option<()> {
      None
    }
  }

  impl sp_authority_discovery::AuthorityDiscoveryApi<Block> for Runtime {
    fn authorities() -> Vec<sp_authority_discovery::AuthorityId> {
      // Converts to `[u8; 32]` so it can be hashed
      let mut all = alloc::collections::BTreeSet::<[u8; 32]>::new();
      for network in NetworkId::all() {
        for participant in
          <Self as super::runtime_decl_for_serai_api::SeraiApi<Block>>::validators(network) {
          all.insert(sp_core::sr25519::Public::from(participant).into());
        }
      }
      all
        .into_iter()
        .map(|id| sp_authority_discovery::AuthorityId::from(sp_core::sr25519::Public::from(id)))
        .collect()
    }
  }

  impl crate::SeraiApi<Block> for Runtime {
    fn events() -> Vec<Vec<Vec<u8>>> {
      Core::events()
    }
    fn validators(network: NetworkId) -> Vec<serai_abi::primitives::crypto::Public> {
      // Returning the latest-decided, not latest and active, means the active set
      // may fail to peer find if there isn't sufficient overlap. If a large amount reboot,
      // forcing some validators to successfully peer find in order for the threshold to become
      // online again, this may cause a liveness failure.
      //
      // This is assumed not to matter in real life, yet an interesting note.
      let Some(session) = ValidatorSets::latest_decided_session(network) else {
        return vec![]
      };
      ValidatorSets::selected_validators(ValidatorSet { network, session })
        .map(|validator| validator.0.into())
        .collect()
    }
    fn current_session(network: NetworkId) -> Option<Session> {
      ValidatorSets::current_session(network)
    }
    fn current_stake(network: NetworkId) -> Option<Amount> {
      ValidatorSets::stake_for_current_validator_set(network)
    }
    fn keys(set: ExternalValidatorSet) -> Option<serai_abi::primitives::crypto::KeyPair> {
      ValidatorSets::oraclization_key(set)
        .and_then(|oraclization_key| {
          ValidatorSets::external_key(set)
            .map(|external_key| {
              serai_abi::primitives::crypto::KeyPair(oraclization_key.into(), external_key)
            })
        })
    }
    fn current_validators(network: NetworkId) -> Option<Vec<SeraiAddress>> {
      let session = ValidatorSets::current_session(network)?;
      Some(
        ValidatorSets::selected_validators(ValidatorSet { network, session })
          .map(|(key, _key_shares)| SeraiAddress::from(key))
          .collect()
      )
    }
    fn pending_slash_report(network: ExternalNetworkId) -> bool {
      ValidatorSets::pending_slash_report(network)
    }
    fn embedded_elliptic_curve_keys(
      validator: SeraiAddress,
      network: ExternalNetworkId,
    ) -> Option<EmbeddedEllipticCurveKeys> {
      ValidatorSets::embedded_elliptic_curve_keys(validator.into(), network)
    }
  }
}

#[derive(Clone, Default, PartialEq, Eq, Debug)]
struct Context;
impl serai_abi::TransactionContext for Context {
  // TODO
  const SIGNED_WEIGHT: Weight = Weight::zero();

  type RuntimeCall = RuntimeCall;

  /// The implicit context to verify transactions with.
  fn implicit_context() -> serai_abi::ImplicitContext {
    serai_abi::ImplicitContext {
      genesis: System::block_hash(0).into(),
      protocol_id: [0; 32], // TODO via build script
    }
  }

  /// If a block is present in the blockchain.
  fn block_is_present_in_blockchain(&self, hash: &serai_abi::primitives::BlockHash) -> bool {
    serai_core_pallet::Pallet::<Runtime>::block_exists(hash)
  }
  /// The time embedded into the current block.
  fn current_time(&self) -> Option<u64> {
    todo!("TODO")
  }
  /// Get the next nonce for an account.
  fn next_nonce(&self, signer: &SeraiAddress) -> u32 {
    serai_core_pallet::Pallet::<Runtime>::next_nonce(signer)
  }
  /// If the signer can pay the SRI fee.
  fn can_pay_fee(
    &self,
    signer: &SeraiAddress,
    fee: serai_abi::primitives::balance::Amount,
  ) -> Result<(), sp_runtime::transaction_validity::TransactionValidityError> {
    use serai_abi::primitives::coin::Coin;
    if serai_coins_pallet::Pallet::<Runtime, CoinsInstance>::balance(signer, Coin::Serai) >= fee {
      Ok(())
    } else {
      Err(sp_runtime::transaction_validity::TransactionValidityError::Invalid(
        sp_runtime::transaction_validity::InvalidTransaction::Payment,
      ))
    }
  }

  fn start_transaction(&self) {
    Core::start_transaction()
  }
  fn consume_next_nonce(&self, signer: &SeraiAddress) {
    serai_core_pallet::Pallet::<Runtime>::consume_next_nonce(signer)
  }
  /// Have the transaction pay its SRI fee.
  fn pay_fee(
    &self,
    signer: &SeraiAddress,
    fee: serai_abi::primitives::balance::Amount,
  ) -> Result<(), sp_runtime::transaction_validity::TransactionValidityError> {
    use serai_abi::primitives::{coin::*, balance::*};
    serai_coins_pallet::Pallet::<Runtime, CoinsInstance>::burn(
      RuntimeOrigin::signed(Public::from(*signer)),
      Balance { coin: Coin::Serai, amount: fee },
    )
    .map_err(|_| {
      sp_runtime::transaction_validity::TransactionValidityError::Invalid(
        sp_runtime::transaction_validity::InvalidTransaction::Payment,
      )
    })
  }
  fn end_transaction(&self, transaction_hash: [u8; 32]) {
    Core::end_transaction(transaction_hash);
  }
}

/* TODO
use validator_sets::MembershipProof;

const NORMAL_DISPATCH_RATIO: Perbill = Perbill::from_percent(75);

parameter_types! {
  pub const Version: RuntimeVersion = VERSION;

  pub const SS58Prefix: u8 = 42; // TODO: Remove for Bech32m

  // 1 MB block size limit
  pub BlockLength: system::limits::BlockLength =
    system::limits::BlockLength::max_with_normal_ratio(BLOCK_SIZE, NORMAL_DISPATCH_RATIO);
  pub BlockWeights: system::limits::BlockWeights =
    system::limits::BlockWeights::with_sensible_defaults(
      Weight::from_parts(2u64 * WEIGHT_REF_TIME_PER_SECOND, u64::MAX),
      NORMAL_DISPATCH_RATIO,
    );
}

impl timestamp::Config for Runtime {
  type Moment = u64;
  type OnTimestampSet = Babe;
  type MinimumPeriod = ConstU64<{ (TARGET_BLOCK_TIME * 1000) / 2 }>;
  type WeightInfo = ();
}

impl coins::Config for Runtime {
  type AllowMint = ValidatorSets;
}

impl dex::Config for Runtime {
  type LPFee = ConstU32<3>; // 0.3%
  type MintMinLiquidity = ConstU64<10000>;

  type MaxSwapPathLength = ConstU32<3>; // coin1 -> SRI -> coin2

  type MedianPriceWindowLength = ConstU16<{ MEDIAN_PRICE_WINDOW_LENGTH }>;

  type WeightInfo = dex::weights::SubstrateWeight<Runtime>;
}

pub struct IdentityValidatorIdOf;
impl Convert<PublicKey, Option<PublicKey>> for IdentityValidatorIdOf {
  fn convert(key: PublicKey) -> Option<PublicKey> {
    Some(key)
  }
}

impl signals::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
  // 1 week
  #[allow(clippy::cast_possible_truncation)]
  type RetirementValidityDuration = ConstU32<{ (7 * 24 * 60 * 60) / (TARGET_BLOCK_TIME as u32) }>;
  // 2 weeks
  #[allow(clippy::cast_possible_truncation)]
  type RetirementLockInDuration = ConstU32<{ (2 * 7 * 24 * 60 * 60) / (TARGET_BLOCK_TIME as u32) }>;
}

impl in_instructions::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
}

impl genesis_liquidity::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
}

impl emissions::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
}

impl economic_security::Config for Runtime {
  type RuntimeEvent = RuntimeEvent;
}

// for publishing equivocation evidences.
impl<C> frame_system::offchain::SendTransactionTypes<C> for Runtime
where
  RuntimeCall: From<C>,
{
  type Extrinsic = Transaction;
  type OverarchingCall = RuntimeCall;
}

// for validating equivocation evidences.
// The following runtime construction doesn't actually implement the pallet as doing so is
// unnecessary
// TODO: Replace the requirement on Config for a requirement on FindAuthor directly
impl pallet_authorship::Config for Runtime {
  type FindAuthor = ValidatorSets;
  type EventHandler = ();
}

/// Longevity of an offence report.
pub type ReportLongevity = <Runtime as pallet_babe::Config>::EpochDuration;

#[cfg(feature = "runtime-benchmarks")]
#[macro_use]
extern crate frame_benchmarking;

#[cfg(feature = "runtime-benchmarks")]
mod benches {
  define_benchmarks!(
    [frame_benchmarking, BaselineBench::<Runtime>]

    [system, SystemBench::<Runtime>]

    [balances, Balances]

    [babe, Babe]
    [grandpa, Grandpa]
  );
}

sp_api::impl_runtime_apis! {
  impl validator_sets::ValidatorSetsApi<Block> for Runtime {
    fn external_network_key(network: ExternalNetworkId) -> Option<Vec<u8>> {
      ValidatorSets::external_network_key(network)
    }
  }

  impl dex::DexApi<Block> for Runtime {
    fn quote_price_exact_tokens_for_tokens(
      coin1: Coin,
      coin2: Coin,
      amount: SubstrateAmount,
      include_fee: bool
    ) -> Option<SubstrateAmount> {
      Dex::quote_price_exact_tokens_for_tokens(coin1, coin2, amount, include_fee)
    }

    fn quote_price_tokens_for_exact_tokens(
      coin1: Coin,
      coin2: Coin,
      amount: SubstrateAmount,
      include_fee: bool
    ) -> Option<SubstrateAmount> {
      Dex::quote_price_tokens_for_exact_tokens(coin1, coin2, amount, include_fee)
    }

    fn get_reserves(coin1: Coin, coin2: Coin) -> Option<(SubstrateAmount, SubstrateAmount)> {
      Dex::get_reserves(&coin1, &coin2).ok()
    }
  }
}
*/