feat: Exchange Issuance for Leveraged Tokens (#97)

* Starting point for new Exchange Issuance Contract by combining EIv2 with flashloan interface

* Copy EIv2 test suite as starting point for test suite

* Addd failing test tryinga flashloan

* Test failing due to 0 Balance of AToken

* Add function retrieving long / short token addresses and amounts

* Copy fli setup from fli strategy extension test

* Log out issuance / redemption units in fli strategy integration test

* Add engage fliExtension call to test

* Fix getLeveraged Token Data

* Add method borrowing short token

* Delete most of the test setup and start form aaveFLI setup

* Engagement of aave token working

* Test for skeleton issueExactSetFromLongToken passing

* Switch to flashloaning long token

* Deposit long token in smart contract

* Contract issuing set with borrowed long tokens

* Contract swapping short for long token passing

* Obtaining shortfall from user passing

* Remove unneeded methods copied from original exchange issuance contract

* Add some docstring comments

* Move param decoding into helper functions to avoid stack too deep error

* Add check against max amount input

* Add test checking unimplemented method reverting

* Emit ExchangeIssue event

* remove logs

* Cleanup unintended changes

* Cleanup log statements

* let user pass exchange to use

* Approve lending pool once when approving the set token

* Reset lending pool allowance to zero before approving maxUint

* Updating comment / docstrings

* Limit executeOperation to only be called by the lending pool

* Finish fist implementation of redemption workflow

* Add minAmountOutput check

* Add docstring comment

* Add function to redeem for custom ERC20

* Issue from erc20

* Redemption to ETH

* Full test pipeline green for issuance / redemption

* Refactor obtainLongTokens method

* Refactor _liquidateLongTokens method

* More docstrings

* Add separate address for intermediat token

* Use intermediate token in trades

* Factor out collateralToken into separate variable

* Update hardhat and add skeleton integration test

* Remove uniswapV2 from exchanges

* Deploy exchange issuance contract in integration test

* Test issuing ETH2x for Matic passing

* Add integration test for redeeming to ETH

* Add test issuing / redeeming for long token

* Add buffer amount to short token to avoid debt issuance module reverting on redemption

* Extend integration test

* Relative instead of absolute tolerance on debt amount for redemption

* Sync aave leverage module before every issuance / redemption

* Pin block in integration tests

* Integration test for issuance via erc20

* Remove console logs

* Revert "Remove uniswapV2 from exchanges"

This reverts commit 7be0c38.

* Adjust expected revert messages and remove gasPrice: 0

* Fix broken unittests

* Rename Uniswap references to quickswap

* Run polygon integration tests in circleci

* Add polygon integration test to workflow

* Change maxAmountIn when swapping tokens for exact tokens

* Various minor changes based on PR feedback

* Remove factory variables from the contract and add constructor param documentation

* Use struct to contain decoded param values and avoid having decode multiple times

* Various minor refactorings and nits from PR review

* Factor out implementation of various public helper functions into one internal and one external function to save gas

* Remove LongToken from Payment options and instead check inputToken parameter to decide wether or not swap is necessary

* Remove LongToken versions of issue/redeem functions

* Minor nits / refactorings based on second round of PR comments

* Remove paymentParams encoding/decoding

* Add check to prevent attacks by initiating a flashloan on behalf of the EI contract

* Move max/minAmount checks to the top level of the executeOperation function

* Move issuance / redemption workflows into separate helper functions to reduce complexity of executeOperation

* Rename long / short to collateral / debt for consistency with naming in existing contracts

* Generate leveraged token data only one and add it to the DecodedParams object

* Add missing javadocs and rename _amountSetToken to _setAmount for consistency

* Add missing parameter in javadoc

* Fix misaligned javadoc

* Move exchange interaction to separate contract

* Add UniV3 integration

* Factor out uniV2/V3 versions of swap methods into separate methods

* Add method to encode uniV3 path

* First try generating uni V3 path from token addresses / fees. Currently failing

* fix wrong array indices

* Remove unneeded newPath variable

* Allow user to pass in swap parameters

* Remove generatePath method

* Adjust integration test to new interface

* Test and fix uniV3 multihops

* Add javadocs to new DEXAdapter methods

* remove intermediate token address

* Adjust integration test to use different fee levels

* Minor changes based on PR feedback

* Add minAmountOutput parameter for exactInput swap

* More refactoring based on pr feedback

* More cosmetic refactoring / changes and extensions of the javadocs

* More adjustments based on compiler warnings

Co-authored-by: Christian Koopmann <[email protected]>
Co-authored-by: Christian Koopmann <[email protected]>
Co-authored-by: Christian Koopmann <[email protected]>

Author: 4 people

.circleci/config.yml

@@ -80,6 +80,29 @@ jobs:
           name: Hardhat Test
           command: yarn test:fork
 
+  test_integration_polygon:
+    docker:
+      - image: cimg/node:lts
+    working_directory: ~/index-coop-smart-contracts
+    steps:
+      - setup_remote_docker:
+          docker_layer_caching: false
+      - run:
+          name: Fetch solc version
+          command: docker pull ethereum/solc:0.6.10
+      - restore_cache:
+          key: compiled-env-{{ .Environment.CIRCLE_SHA1 }}
+      - run:
+          name: Set Up Environment Variables
+          command: cp .env.default .env
+      - run:
+          name: Test RPC
+          command: yarn chain:fork:polygon
+          background: true
+      - run:
+          name: Hardhat Test
+          command: yarn test:integration:polygon
+
   coverage:
     docker:
       - image: cimg/node:lts
@@ -179,6 +202,9 @@ workflows:
       - test_forked_network:
           requires:
             - checkout_and_compile
+      - test_integration_polygon:
+          requires:
+            - checkout_and_compile
       - coverage:
           requires:
             - checkout_and_compile