canvas: More refactoring (#997)

* canvas: Move contracts config to own file

* Reduce usage of parameter_types where possible

* Fix try-runtime compilation

polkadot-parachains/canvas-kusama/src/contracts.rs

@@ -0,0 +1,54 @@
+use crate::{
+	constants::currency::deposit, Balance, Balances, Call, Event, RandomnessCollectiveFlip,
+	Runtime, RuntimeBlockWeights, Timestamp,
+};
+use frame_support::{parameter_types, traits::Nothing, weights::Weight};
+use pallet_contracts::{
+	weights::{SubstrateWeight, WeightInfo},
+	Config, DefaultAddressGenerator, Frame, Schedule,
+};
+pub use parachains_common::AVERAGE_ON_INITIALIZE_RATIO;
+
+// Prints debug output of the `contracts` pallet to stdout if the node is
+// started with `-lruntime::contracts=debug`.
+pub const CONTRACTS_DEBUG_OUTPUT: bool = true;
+
+parameter_types! {
+	pub const DepositPerItem: Balance = deposit(1, 0);
+	pub const DepositPerByte: Balance = deposit(0, 1);
+	// The lazy deletion runs inside on_initialize.
+	pub DeletionWeightLimit: Weight = AVERAGE_ON_INITIALIZE_RATIO *
+		RuntimeBlockWeights::get().max_block;
+	// The weight needed for decoding the queue should be less or equal than a fifth
+	// of the overall weight dedicated to the lazy deletion.
+	pub DeletionQueueDepth: u32 = ((DeletionWeightLimit::get() / (
+			<Runtime as Config>::WeightInfo::on_initialize_per_queue_item(1) -
+			<Runtime as Config>::WeightInfo::on_initialize_per_queue_item(0)
+		)) / 5) as u32;
+	pub MySchedule: Schedule<Runtime> = Default::default();
+}
+
+impl Config for Runtime {
+	type Time = Timestamp;
+	type Randomness = RandomnessCollectiveFlip;
+	type Currency = Balances;
+	type Event = Event;
+	type Call = Call;
+	/// The safest default is to allow no calls at all.
+	///
+	/// Runtimes should whitelist dispatchables that are allowed to be called from contracts
+	/// and make sure they are stable. Dispatchables exposed to contracts are not allowed to
+	/// change because that would break already deployed contracts. The `Call` structure itself
+	/// is not allowed to change the indices of existing pallets, too.
+	type CallFilter = Nothing;
+	type DepositPerItem = DepositPerItem;
+	type DepositPerByte = DepositPerByte;
+	type WeightPrice = pallet_transaction_payment::Pallet<Self>;
+	type WeightInfo = SubstrateWeight<Self>;
+	type ChainExtension = ();
+	type DeletionQueueDepth = DeletionQueueDepth;
+	type DeletionWeightLimit = DeletionWeightLimit;
+	type Schedule = MySchedule;
+	type CallStack = [Frame<Self>; 31];
+	type AddressGenerator = DefaultAddressGenerator;
+}