Fixes #15 - Create the vault contract

contracts/src/interfaces/ierc20.cairo

@@ -0,0 +1,19 @@
+use starknet::ContractAddress;
+
+#[starknet::interface]
+pub trait IERC20<TContractState> {
+    fn name(self: @TContractState) -> ByteArray;
+    fn symbol(self: @TContractState) -> ByteArray;
+    fn decimals(self: @TContractState) -> u8;
+
+    fn total_supply(self: @TContractState) -> u256;
+    fn balance_of(self: @TContractState, account: ContractAddress) -> u256;
+    fn allowance(self: @TContractState, owner: ContractAddress, spender: ContractAddress) -> u256;
+    fn approve(ref self: TContractState, spender: ContractAddress, amount: u256) -> bool;
+    fn transfer(ref self: TContractState, recipient: ContractAddress, amount: u256) -> bool;
+    fn transfer_from(
+        ref self: TContractState, sender: ContractAddress, recipient: ContractAddress, amount: u256
+    ) -> bool;
+
+    fn mint(ref self: TContractState, recipient: ContractAddress, amount: u256) -> bool;
+}

contracts/src/interfaces/ivault.cairo

@@ -0,0 +1,24 @@
+use core::starknet::ContractAddress;
+use core::starknet::ClassHash;
+use win_saved::types::{YieldSourceData, VaultDetails};
+
+#[derive(Drop, Serde)]
+pub struct WinnerStruct {
+    pub address: ContractAddress,
+    pub date: u64,
+    pub amount: u256
+}
+
+#[starknet::interface]
+pub trait IVault<TContractState> {
+    fn get_vault_details(self: @TContractState) -> VaultDetails;
+    fn deposit(ref self: TContractState, amount: u256);
+    fn withdraw(ref self: TContractState, amount: u256);
+    fn draw(ref self: TContractState, random_value: u32);
+    fn get_total_assets(self: @TContractState) -> u256;
+    fn get_yield_source_data(self: @TContractState) -> YieldSourceData;
+    fn get_recent_winners(self: @TContractState) -> Array<WinnerStruct>;
+    fn pause(ref self: TContractState);
+    fn unpause(ref self: TContractState);
+    fn upgrade(ref self: TContractState, new_class_hash: ClassHash);
+}

contracts/src/interfaces/iyieldsource.cairo

@@ -12,8 +12,8 @@ pub trait IYieldSource<TContractState> {
     fn withdraw(ref self: TContractState, token: ContractAddress, amount: felt252);
     fn withdraw_yield(ref self: TContractState, token: ContractAddress);
     fn get_supply_pool_data(self: @TContractState, token: ContractAddress) -> YieldSourceData;
-    fn get_yield_generated(self: @TContractState, token: ContractAddress) -> u128;
-    fn get_total_value_locked(self: @TContractState, token: ContractAddress) -> u128;
+    fn get_yield_generated(self: @TContractState, token: ContractAddress) -> u256;
+    fn get_total_value_locked(self: @TContractState, token: ContractAddress) -> u256;
     fn get_supported_assets(self: @TContractState) -> Array<ContractAddress>;
     fn get_source_class_hash(self: @TContractState) -> ClassHash;
     fn get_source_contract_address(self: @TContractState) -> ContractAddress;

contracts/src/lib.cairo

@@ -1,7 +1,10 @@
-pub mod connectors {
-    pub mod zklend;
-}
+pub mod types;
 
 pub mod interfaces {
+    pub mod ivault;
+    pub mod ierc20;
     pub mod iyieldsource;
 }
+
+pub mod vault;
+

contracts/src/types.cairo

@@ -0,0 +1,29 @@
+use starknet::ContractAddress;
+
+#[derive(Copy, Drop, Serde)]
+pub struct YieldSourceData {
+    pub lending_accumulator: felt252,
+    pub deposit_limit: felt252,
+}
+
+#[derive(Copy, Drop, Serde)]
+pub struct UserBalanceStruct {
+    pub address: ContractAddress,
+    pub amount: u256,
+}
+
+#[derive(Drop, Serde)]
+pub struct TokenData {
+    pub symbol: ByteArray,
+    pub address: ContractAddress
+}
+
+#[derive(Drop, Serde)]
+pub struct VaultDetails {
+    pub yield_token: TokenData,
+    pub vault_token: TokenData,
+    pub APY: felt252,
+    pub owner: ContractAddress,
+    pub total_deposit: u256,
+    pub total_yield: u256
+}