Pallet for Purchase (#1369)

* initial mock

* remove statement

* Merge branch 'master' into shawntabrizi-crowdsale

* only work for dead accounts

* Revert "Merge branch 'master' into shawntabrizi-crowdsale"

This reverts commit 5d26bc22f30fdbc58854dc64398bddc1f19c4d24.

* update storage name

* Re-mock

* Update comment

* payouts

* test signature verification

* Update wording

* fix tests

* support both free and locked balance

* Single statement set in configuration trait

* Configurable purchase limit, initiated status

* Account creation tests

* make note about `max_amount` check

* Update validity status tests

* update balance tests

* payment test

* finish tests

* enable in runtime

* Test and verify ed25519

* make purchase pallet more configurable on the fly

* Remove runtime check on purchase amount.

* clean up trait

* add basic weights

* add extra super saftey check for vesting

* Add vat tracking

* remove unused const

* Update to W3F Origins

* remove stale comment

* Support existing accounts w/o existing vesting schedule

* Update runtime/common/src/purchase.rs

Co-authored-by: Gavin Wood <gavin@parity.io>

* Add support for partially unlocked portion of purchased DOTs

* add trait import

* Expose constants from pallet

* Fixes

* Fixes

* Update runtime/polkadot/src/lib.rs

Co-authored-by: Gavin Wood <gavin@parity.io>

polkadot/runtime/common/src/lib.rs

@@ -25,6 +25,7 @@ pub mod slot_range;
 pub mod registrar;
 pub mod slots;
 pub mod crowdfund;
+pub mod purchase;
 pub mod impls;
 
 use primitives::v0::BlockNumber;

polkadot/runtime/polkadot/Cargo.toml

@@ -68,7 +68,7 @@ frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch =
 frame-system-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-offences-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 pallet-session-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
-hex-literal = { version = "0.2.1", optional = true }
+hex-literal = { version = "0.2.1" }
 
 runtime-common = { package = "polkadot-runtime-common", path = "../common", default-features = false }
 primitives = { package = "polkadot-primitives", path = "../../primitives", default-features = false }
@@ -163,7 +163,8 @@ runtime-benchmarks = [
 	"vesting/runtime-benchmarks",
 	"pallet-offences-benchmarking",
 	"pallet-session-benchmarking",
-	"hex-literal",
+	# renable when optional
+	# "hex-literal",
 ]
 # When enabled, the runtime api will not be build.
 #

polkadot/runtime/polkadot/src/lib.rs

@@ -25,7 +25,7 @@ use runtime_common::{
 	impls::{CurrencyToVoteHandler, ToAuthor},
 	NegativeImbalance, BlockHashCount, MaximumBlockWeight, AvailableBlockRatio,
 	MaximumBlockLength, BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight,
-	MaximumExtrinsicWeight,
+	MaximumExtrinsicWeight, purchase,
 };
 
 use sp_std::prelude::*;
@@ -57,11 +57,11 @@ use version::NativeVersion;
 use sp_core::OpaqueMetadata;
 use sp_staking::SessionIndex;
 use frame_support::{
-	parameter_types, construct_runtime, debug, RuntimeDebug,
+	parameter_types, ord_parameter_types, construct_runtime, debug, RuntimeDebug,
 	traits::{KeyOwnerProofSystem, SplitTwoWays, Randomness, LockIdentifier, Filter},
 	weights::Weight,
 };
-use system::{EnsureRoot, EnsureOneOf};
+use system::{EnsureRoot, EnsureOneOf, EnsureSignedBy};
 use im_online::sr25519::AuthorityId as ImOnlineId;
 use authority_discovery_primitives::AuthorityId as AuthorityDiscoveryId;
 use transaction_payment_rpc_runtime_api::RuntimeDispatchInfo;
@@ -135,7 +135,8 @@ impl Filter<Call> for BaseFilter {
 			Call::Session(_) | Call::FinalityTracker(_) | Call::Grandpa(_) | Call::ImOnline(_) |
 			Call::AuthorityDiscovery(_) |
 			Call::Utility(_) | Call::Claims(_) | Call::Vesting(_) | Call::Sudo(_) |
-			Call::Identity(_) | Call::Proxy(_) | Call::Multisig(_) | Call::Poll(_)  =>
+			Call::Identity(_) | Call::Proxy(_) | Call::Multisig(_) | Call::Poll(_) |
+			Call::Purchase(_) =>
 				true,
 		}
 	}
@@ -944,6 +945,46 @@ impl poll::Trait for Runtime {
 	type End = PollEnd;
 }
 
+parameter_types! {
+	pub const MaxStatementLength: usize = 1_000;
+	pub const UnlockedProportion: Permill = Permill::zero();
+	pub const MaxUnlocked: Balance = 0;
+}
+
+ord_parameter_types! {
+	pub const W3FValidity: AccountId = AccountId::from(
+		// 142wAF65SK7PxhyzzrWz5m5PXDtooehgePBd7rc2NWpfc8Wa
+		hex_literal::hex!("862e432e0cf75693899c62691ac0f48967f815add97ae85659dcde8332708551")
+	);
+	pub const W3FConfiguration: AccountId = AccountId::from(
+		// 1KvKReVmUiTc2LW2a4qyHsaJJ9eE9LRsywZkMk5hyBeyHgw
+		hex_literal::hex!("0e6de68b13b82479fbe988ab9ecb16bad446b67b993cdd9198cd41c7c6259c49")
+	);
+}
+
+type ValidityOrigin = EnsureOneOf<
+	AccountId,
+	EnsureRoot<AccountId>,
+	EnsureSignedBy<W3FValidity, AccountId>,
+>;
+
+type ConfigurationOrigin = EnsureOneOf<
+	AccountId,
+	EnsureRoot<AccountId>,
+	EnsureSignedBy<W3FConfiguration, AccountId>,
+>;
+
+impl purchase::Trait for Runtime {
+	type Event = Event;
+	type Currency = Balances;
+	type VestingSchedule = Vesting;
+	type ValidityOrigin = ValidityOrigin;
+	type ConfigurationOrigin = ConfigurationOrigin;
+	type MaxStatementLength = MaxStatementLength;
+	type UnlockedProportion = UnlockedProportion;
+	type MaxUnlocked = MaxUnlocked;
+}
+
 construct_runtime! {
 	pub enum Runtime where
 		Block = Block,
@@ -1012,6 +1053,9 @@ construct_runtime! {
 
 		// Poll module.
 		Poll: poll::{Module, Call, Storage, Event<T>},
+
+		// DOT Purchase module. Late addition.
+		Purchase: purchase::{Module, Call, Storage, Event<T>},
 	}
 }