From be1a1a122d86024048ebe7f4f635f7bf96be3164 Mon Sep 17 00:00:00 2001
From: Dmitry Lavrenov <lawrenowdima@gmail.com>
Date: Thu, 29 Jun 2023 21:52:39 +0300
Subject: [PATCH 1/3] Introduce currency swap related primitives

---
 Cargo.lock                                 |  7 +++++++
 crates/primitives-currency-swap/Cargo.toml | 13 ++++++++++++
 crates/primitives-currency-swap/src/lib.rs | 23 ++++++++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 crates/primitives-currency-swap/Cargo.toml
 create mode 100644 crates/primitives-currency-swap/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index cd600727a..330aa87ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6751,6 +6751,13 @@ dependencies = [
  "sp-std",
 ]
 
+[[package]]
+name = "primitives-currency-swap"
+version = "0.1.0"
+dependencies = [
+ "frame-support",
+]
+
 [[package]]
 name = "primitives-ethereum"
 version = "0.1.0"
diff --git a/crates/primitives-currency-swap/Cargo.toml b/crates/primitives-currency-swap/Cargo.toml
new file mode 100644
index 000000000..4468a8169
--- /dev/null
+++ b/crates/primitives-currency-swap/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "primitives-currency-swap"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+frame-support = { default-features = false, git = "https://github.com/humanode-network/substrate", branch = "locked/polkadot-v0.9.38" }
+
+[features]
+default = ["std"]
+std = ["frame-support/std"]
+try-runtime = ["frame-support/try-runtime"]
diff --git a/crates/primitives-currency-swap/src/lib.rs b/crates/primitives-currency-swap/src/lib.rs
new file mode 100644
index 000000000..31831e880
--- /dev/null
+++ b/crates/primitives-currency-swap/src/lib.rs
@@ -0,0 +1,23 @@
+//! Currency swap related primitives.
+
+// Either generate code at stadard mode, or `no_std`, based on the `std` feature presence.
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use frame_support::{sp_runtime::DispatchError, traits::Currency};
+
+/// Currency swap interface.
+pub trait CurrencySwap<AccountIdFrom, AccountIdTo> {
+    /// The currency type balances send from.
+    type From: Currency<AccountIdFrom>;
+
+    /// The currency type balances send to.
+    type To: Currency<AccountIdTo>;
+
+    /// A possible error happens during the actual swap logic.
+    type Error: Into<DispatchError>;
+
+    /// The actual swap logic.
+    fn swap(
+        imbalance: <Self::From as Currency<AccountIdFrom>>::NegativeImbalance,
+    ) -> Result<<Self::To as Currency<AccountIdTo>>::NegativeImbalance, Self::Error>;
+}

From e6b374d6ba3cea524082d52595d45b4c5a70ed87 Mon Sep 17 00:00:00 2001
From: Dmitry Lavrenov <39522748+dmitrylavrenov@users.noreply.github.com>
Date: Thu, 29 Jun 2023 22:15:12 +0300
Subject: [PATCH 2/3] Edit docs for From type.

Co-authored-by: MOZGIII <mike-n@narod.ru>
---
 crates/primitives-currency-swap/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/primitives-currency-swap/src/lib.rs b/crates/primitives-currency-swap/src/lib.rs
index 31831e880..2e30110ef 100644
--- a/crates/primitives-currency-swap/src/lib.rs
+++ b/crates/primitives-currency-swap/src/lib.rs
@@ -7,7 +7,7 @@ use frame_support::{sp_runtime::DispatchError, traits::Currency};
 
 /// Currency swap interface.
 pub trait CurrencySwap<AccountIdFrom, AccountIdTo> {
-    /// The currency type balances send from.
+    /// The currency to convert from.
     type From: Currency<AccountIdFrom>;
 
     /// The currency type balances send to.

From 2f2da3895d2a87b1675c278708b57bddc25fbc28 Mon Sep 17 00:00:00 2001
From: Dmitry Lavrenov <39522748+dmitrylavrenov@users.noreply.github.com>
Date: Thu, 29 Jun 2023 22:15:39 +0300
Subject: [PATCH 3/3] Edit docs for To type

Co-authored-by: MOZGIII <mike-n@narod.ru>
---
 crates/primitives-currency-swap/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/primitives-currency-swap/src/lib.rs b/crates/primitives-currency-swap/src/lib.rs
index 2e30110ef..348d644c1 100644
--- a/crates/primitives-currency-swap/src/lib.rs
+++ b/crates/primitives-currency-swap/src/lib.rs
@@ -10,7 +10,7 @@ pub trait CurrencySwap<AccountIdFrom, AccountIdTo> {
     /// The currency to convert from.
     type From: Currency<AccountIdFrom>;
 
-    /// The currency type balances send to.
+    /// The currency to convert to.
     type To: Currency<AccountIdTo>;
 
     /// A possible error happens during the actual swap logic.