Add Dex pallet (#407)

* Move pallet-asset-conversion

* update licensing

* initial integration

* Integrate Currency & Assets types

* integrate liquidity tokens

* fmt

* integrate dex pallet tests

* fmt

* compilation error fixes

* integrate dex benchmarks

* fmt

* cargo clippy

* replace all occurrences of "asset" with "coin"

* add the actual add liq/swap logic to in-instructions

* add client side & tests

* fix deny

* Lint and changes

- Renames InInstruction::AddLiquidity to InInstruction::SwapAndAddLiquidity
- Makes create_pool an internal function
- Makes dex-pallet exclusively create pools against a native coin
- Removes various fees
- Adds new crates to GH workflow

* Fix rebase artifacts

* Correct other rebase artifact

* Correct CI specification for liquidity-tokens

* Correct primitives' test to the standardized pallet account scheme

---------

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

substrate/runtime/Cargo.toml

@@ -40,12 +40,15 @@ frame-executive = { git = "https://github.com/serai-dex/substrate", default-feat
 frame-benchmarking = { git = "https://github.com/serai-dex/substrate", default-features = false, optional = true }
 
 serai-primitives = { path = "../primitives", default-features = false }
+serai-dex-primitives = { path = "../dex/primitives", default-features = false }
 
 pallet-timestamp = { git = "https://github.com/serai-dex/substrate", default-features = false }
 
 pallet-transaction-payment = { git = "https://github.com/serai-dex/substrate", default-features = false }
 
 coins-pallet = { package = "serai-coins-pallet", path = "../coins/pallet", default-features = false }
+liquidity-tokens-pallet = { package = "serai-liquidity-tokens-pallet", path = "../liquidity-tokens/pallet", default-features = false }
+dex-pallet = { package = "serai-dex-pallet", path = "../dex/pallet", default-features = false }
 
 validator-sets-pallet = { package = "serai-validator-sets-pallet", path = "../validator-sets/pallet", default-features = false }
 pallet-session = { git = "https://github.com/serai-dex/substrate", default-features = false }
@@ -94,12 +97,15 @@ std = [
   "frame-executive/std",
 
   "serai-primitives/std",
+  "serai-dex-primitives/std",
 
   "pallet-timestamp/std",
 
   "pallet-transaction-payment/std",
 
   "coins-pallet/std",
+  "liquidity-tokens-pallet/std",
+  "dex-pallet/std",
 
   "validator-sets-pallet/std",
   "pallet-session/std",
@@ -126,6 +132,8 @@ runtime-benchmarks = [
 
   "pallet-timestamp/runtime-benchmarks",
 
+  "dex-pallet/runtime-benchmarks",
+
   "pallet-babe/runtime-benchmarks",
   "pallet-grandpa/runtime-benchmarks",
 ]

substrate/runtime/src/lib.rs

@@ -17,6 +17,8 @@ pub use pallet_timestamp as timestamp;
 pub use pallet_transaction_payment as transaction_payment;
 
 pub use coins_pallet as coins;
+pub use liquidity_tokens_pallet as liquidity_tokens;
+pub use dex_pallet as dex;
 
 pub use validator_sets_pallet as validator_sets;
 pub use pallet_session as session;
@@ -45,7 +47,7 @@ use sp_runtime::{
   ApplyExtrinsicResult, Perbill,
 };
 
-use primitives::{PublicKey, SeraiAddress, AccountLookup, Signature, SubstrateAmount};
+use primitives::{PublicKey, SeraiAddress, Coin, AccountLookup, Signature, SubstrateAmount};
 
 use support::{
   traits::{ConstU8, ConstU32, ConstU64, Contains},
@@ -167,6 +169,7 @@ impl Contains<RuntimeCall> for CallFilter {
 
       // All of these pallets are our own, and all of their written calls are intended to be called
       RuntimeCall::Coins(call) => !matches!(call, coins::Call::__Ignore(_, _)),
+      RuntimeCall::Dex(call) => !matches!(call, dex::Call::__Ignore(_, _)),
       RuntimeCall::ValidatorSets(call) => !matches!(call, validator_sets::Call::__Ignore(_, _)),
       RuntimeCall::InInstructions(call) => !matches!(call, in_instructions::Call::__Ignore(_, _)),
       RuntimeCall::Signals(call) => !matches!(call, signals::Call::__Ignore(_, _)),
@@ -243,6 +246,37 @@ impl coins::Config for Runtime {
   type RuntimeEvent = RuntimeEvent;
 }
 
+impl liquidity_tokens::Config for Runtime {
+  type RuntimeEvent = RuntimeEvent;
+}
+
+impl dex::Config for Runtime {
+  type RuntimeEvent = RuntimeEvent;
+  type Currency = Coins;
+  type Balance = SubstrateAmount;
+  type CoinBalance = SubstrateAmount;
+  // TODO: Review if this should be u64/u128 or u64/u256 (and rounding in general).
+  type HigherPrecisionBalance = u128;
+
+  type CoinId = Coin;
+  type MultiCoinId = Coin;
+  type MultiCoinIdConverter = serai_dex_primitives::CoinConverter;
+  type PoolCoinId = u32;
+
+  type Coins = Coins;
+  type PoolCoins = LiquidityTokens;
+
+  type LPFee = ConstU32<3>; // 0.3%
+  type MintMinLiquidity = ConstU64<10000>;
+
+  type MaxSwapPathLength = ConstU32<3>; // coin1 -> SRI -> coin2
+
+  type WeightInfo = dex::weights::SubstrateWeight<Runtime>;
+
+  #[cfg(feature = "runtime-benchmarks")]
+  type BenchmarkHelper = ();
+}
+
 impl validator_sets::Config for Runtime {
   type RuntimeEvent = RuntimeEvent;
 }
@@ -342,6 +376,8 @@ construct_runtime!(
     TransactionPayment: transaction_payment,
 
     Coins: coins,
+    LiquidityTokens: liquidity_tokens,
+    Dex: dex,
 
     ValidatorSets: validator_sets,
     Session: session,