Add preimage pallet (#241)

### Description
<!-- Describe what change this PR is implementing -->

Adds preimage pallet to cere & cere-dev

### Types of Changes
<!--- What types of changes does your code introduce? -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Dependency upgrade (A change in substrate or any 3rd party crate
version)

### Migrations and Hooks
<!--- Check the following box with an x if the following applies: -->
- [x] This change requires a runtime migration.
- [ ] Modifies `on_initialize`
- [ ] Modifies `on_finalize`

### Checklist
<!--- All boxes need to be checked. Follow this checklist before
requiring PR review -->
- [ ] Change has been tested locally.
- [ ] Change adds / updates tests.
- [x] Changelog doc updated.

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - [C,D] Updated Substrate to polkadot-v0.9.38
+- [C] Added pallet-preimage to support democracy functionality.
 
 ## [4.8.6]
 

runtime/cere-dev/Cargo.toml

@@ -72,6 +72,7 @@ pallet-nomination-pools-benchmarking = { git = "https://github.com/paritytech/su
 pallet-nomination-pools-runtime-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
 pallet-offences = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38", default-features = false, optional = true }
+pallet-preimage = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-proxy = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-randomness-collective-flip = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-recovery = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
@@ -143,6 +144,7 @@ std = [
   "node-primitives/std",
   "pallet-offences/std",
   "pallet-proxy/std",
+  "pallet-preimage/std",
   "sp-core/std",
   "pallet-randomness-collective-flip/std",
   "sp-std/std",
@@ -210,6 +212,7 @@ runtime-benchmarks = [
   "pallet-nomination-pools-benchmarking/runtime-benchmarks",
   "pallet-offences-benchmarking/runtime-benchmarks",
   "pallet-proxy/runtime-benchmarks",
+  "pallet-preimage/runtime-benchmarks",
   "pallet-scheduler/runtime-benchmarks",
   "pallet-session-benchmarking/runtime-benchmarks",
   "pallet-society/runtime-benchmarks",
@@ -254,6 +257,7 @@ try-runtime = [
   "pallet-nomination-pools/try-runtime",
   "pallet-offences/try-runtime",
   "pallet-proxy/try-runtime",
+  "pallet-preimage/try-runtime",
   "pallet-randomness-collective-flip/try-runtime",
   "pallet-recovery/try-runtime",
   "pallet-scheduler/try-runtime",

runtime/cere-dev/src/lib.rs

@@ -130,10 +130,10 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 48700,
+	spec_version: 48701,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
-	transaction_version: 12,
+	transaction_version: 13,
 	state_version: 0,
 };
 
@@ -342,6 +342,21 @@ impl pallet_proxy::Config for Runtime {
 	type AnnouncementDepositFactor = AnnouncementDepositFactor;
 }
 
+parameter_types! {
+	pub const PreimageMaxSize: u32 = 4096 * 1024;
+	pub const PreimageBaseDeposit: Balance = deposit(2, 64);
+	pub const PreimageByteDeposit: Balance = deposit(0, 1);
+}
+
+impl pallet_preimage::Config for Runtime {
+	type WeightInfo = pallet_preimage::weights::SubstrateWeight<Runtime>;
+	type RuntimeEvent = RuntimeEvent;
+	type Currency = Balances;
+	type ManagerOrigin = EnsureRoot<AccountId>;
+	type BaseDeposit = PreimageBaseDeposit;
+	type ByteDeposit = PreimageByteDeposit;
+}
+
 parameter_types! {
 	pub MaximumSchedulerWeight: Weight = Perbill::from_percent(80) *
 		RuntimeBlockWeights::get().max_block;
@@ -1411,6 +1426,7 @@ construct_runtime!(
 		Society: pallet_society,
 		Recovery: pallet_recovery,
 		Vesting: pallet_vesting,
+		Preimage: pallet_preimage,
 		Scheduler: pallet_scheduler,
 		Proxy: pallet_proxy,
 		Multisig: pallet_multisig,
@@ -1477,6 +1493,7 @@ type Migrations = (
 	// this release they will be properly pruned after the bonding duration has
 	// elapsed)
 	pallet_grandpa::migrations::CleanupSetIdSessionMap<Runtime>,
+	pallet_preimage::migration::v1::Migration<Runtime>,
 );
 
 /// Executive: handles dispatch to the various modules.
@@ -1531,6 +1548,7 @@ mod benches {
 		[pallet_nomination_pools, NominationPoolsBench::<Runtime>]
 		[pallet_offences, OffencesBench::<Runtime>]
 		[pallet_proxy, Proxy]
+		[pallet_preimage, Preimage]
 		[pallet_scheduler, Scheduler]
 		[pallet_session, SessionBench::<Runtime>]
 		[pallet_staking, Staking]

runtime/cere/Cargo.toml

@@ -72,6 +72,7 @@ pallet-nomination-pools-benchmarking = { git = "https://github.com/paritytech/su
 pallet-nomination-pools-runtime-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
 pallet-offences = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38", default-features = false, optional = true }
+pallet-preimage = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-proxy = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-randomness-collective-flip = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
 pallet-recovery = { default-features = false, git = "https://github.com/paritytech/substrate.git", branch = "polkadot-v0.9.38" }
@@ -143,6 +144,7 @@ std = [
   "node-primitives/std",
   "pallet-offences/std",
   "pallet-proxy/std",
+  "pallet-preimage/std",
   "sp-core/std",
   "pallet-randomness-collective-flip/std",
   "sp-std/std",
@@ -212,7 +214,9 @@ runtime-benchmarks = [
   "pallet-nomination-pools/runtime-benchmarks",
   "pallet-nomination-pools-benchmarking/runtime-benchmarks",
   "pallet-offences-benchmarking/runtime-benchmarks",
+  "pallet-preimage/runtime-benchmarks",
   "pallet-proxy/runtime-benchmarks",
+  "pallet-preimage/runtime-benchmarks",
   "pallet-scheduler/runtime-benchmarks",
   "pallet-session-benchmarking/runtime-benchmarks",
   "pallet-society/runtime-benchmarks",

runtime/cere/src/lib.rs

@@ -125,10 +125,10 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 48700,
+	spec_version: 48701,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
-	transaction_version: 12,
+	transaction_version: 13,
 	state_version: 0,
 };
 
@@ -337,6 +337,21 @@ impl pallet_proxy::Config for Runtime {
 	type AnnouncementDepositFactor = AnnouncementDepositFactor;
 }
 
+parameter_types! {
+	pub const PreimageMaxSize: u32 = 4096 * 1024;
+	pub const PreimageBaseDeposit: Balance = deposit(4, 128);
+	pub const PreimageByteDeposit: Balance = deposit(0, 2);
+}
+
+impl pallet_preimage::Config for Runtime {
+	type WeightInfo = pallet_preimage::weights::SubstrateWeight<Runtime>;
+	type RuntimeEvent = RuntimeEvent;
+	type Currency = Balances;
+	type ManagerOrigin = EnsureRoot<AccountId>;
+	type BaseDeposit = PreimageBaseDeposit;
+	type ByteDeposit = PreimageByteDeposit;
+}
+
 parameter_types! {
 	pub MaximumSchedulerWeight: Weight = Perbill::from_percent(80) *
 		RuntimeBlockWeights::get().max_block;
@@ -352,7 +367,7 @@ impl pallet_scheduler::Config for Runtime {
 	type MaxScheduledPerBlock = ConstU32<512>;
 	type WeightInfo = pallet_scheduler::weights::SubstrateWeight<Runtime>;
 	type OriginPrivilegeCmp = EqualPrivilegeOnly;
-	type Preimages = ();
+	type Preimages = Preimage;
 }
 
 parameter_types! {
@@ -792,7 +807,7 @@ impl pallet_democracy::Config for Runtime {
 	type MaxVotes = ConstU32<100>;
 	type WeightInfo = pallet_democracy::weights::SubstrateWeight<Runtime>;
 	type MaxProposals = MaxProposals;
-	type Preimages = ();
+	type Preimages = Preimage;
 	type MaxDeposits = ConstU32<100>;
 	type MaxBlacklisted = ConstU32<100>;
 }
@@ -1416,6 +1431,7 @@ construct_runtime!(
 		Society: pallet_society,
 		Recovery: pallet_recovery,
 		Vesting: pallet_vesting,
+		Preimage: pallet_preimage,
 		Scheduler: pallet_scheduler,
 		Proxy: pallet_proxy,
 		Multisig: pallet_multisig,
@@ -1482,6 +1498,7 @@ type Migrations = (
 	// this release they will be properly pruned after the bonding duration has
 	// elapsed)
 	pallet_grandpa::migrations::CleanupSetIdSessionMap<Runtime>,
+	pallet_preimage::migration::v1::Migration<Runtime>,
 );
 /// Executive: handles dispatch to the various modules.
 pub type Executive = frame_executive::Executive<
@@ -1527,6 +1544,7 @@ mod benches {
 		[pallet_nomination_pools, NominationPoolsBench::<Runtime>]
 		[pallet_offences, OffencesBench::<Runtime>]
 		[pallet_proxy, Proxy]
+		[pallet_preimage, Preimage]
 		[pallet_scheduler, Scheduler]
 		[pallet_session, SessionBench::<Runtime>]
 		[pallet_staking, Staking]