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0.7
Mai Finance Process Quality Review
Score: 72%

Overview

This is a Mai Finance Process Quality Review completed on July 19th 2021. It was performed using the Process Review process (version 0.7.3) and is documented here. The review was performed by Nic of DeFiSafety. Check out our Telegram.
The final score of the review is 72%, a pass. The breakdown of the scoring is in Scoring Appendix. For our purposes, a pass is 70%.

Summary of the Process

Very simply, the review looks for the following declarations from the developer's site. With these declarations, it is reasonable to trust the smart contracts.
  • Here are my smart contracts on the blockchain
  • Here is the documentation that explains what my smart contracts do
  • Here are the tests I ran to verify my smart contract
  • Here are the audit(s) performed on my code by third party experts
  • Here are the admin controls and strategies

Disclaimer

This report is for informational purposes only and does not constitute investment advice of any kind, nor does it constitute an offer to provide investment advisory or other services. Nothing in this report shall be considered a solicitation or offer to buy or sell any security, token, future, option or other financial instrument or to offer or provide any investment advice or service to any person in any jurisdiction. Nothing contained in this report constitutes investment advice or offers any opinion with respect to the suitability of any security, and the views expressed in this report should not be taken as advice to buy, sell or hold any security. The information in this report should not be relied upon for the purpose of investing. In preparing the information contained in this report, we have not taken into account the investment needs, objectives and financial circumstances of any particular investor. This information has no regard to the specific investment objectives, financial situation and particular needs of any specific recipient of this information and investments discussed may not be suitable for all investors.
Any views expressed in this report by us were prepared based upon the information available to us at the time such views were written. The views expressed within this report are limited to DeFiSafety and the author and do not reflect those of any additional or third party and are strictly based upon DeFiSafety, its authors, interpretations and evaluation of relevant data. Changed or additional information could cause such views to change. All information is subject to possible correction. Information may quickly become unreliable for various reasons, including changes in market conditions or economic circumstances.
This completed report is copyright (c) DeFiSafety 2021. Permission is given to copy in whole, retaining this copyright label.

Chain

This section indicates the blockchain used by this protocol.
Chain: Polygon
Guidance: Ethereum Binance Smart Chain Polygon

Code and Team

This section looks at the code deployed on the Mainnet that gets reviewed and its corresponding software repository. The document explaining these questions is here. This review will answer the following questions:
1) Are the executing code addresses readily available? (%) 2) Is the code actively being used? (%) 3) Is there a public software repository? (Y/N) 4) Is there a development history visible? (%) 5) Is the team public (not anonymous)? (Y/N)

1) Are the executing code addresses readily available? (%)

Answer: 100%
They are available at website https://docs.mai.finance/resources/smart-contract-addresses, as indicated in the Appendix.
Note: Mai Finance gets a 70 here because their smart contract addresses are under "Links & Resources", rather than the more obvious "Smart Contract Addresses".
Guidance: 100% Clearly labelled and on website, docs or repo, quick to find 70% Clearly labelled and on website, docs or repo but takes a bit of looking 40% Addresses in mainnet.json, in discord or sub graph, etc 20% Address found but labeling not clear or easy to find 0% Executing addresses could not be found

How to improve this score:

Make the Ethereum addresses of the smart contract utilized by your application available on either your website or your GitHub (in the README for instance). Ensure the addresses is up to date. This is a very important question towards the final score.

2) Is the code actively being used? (%)

Answer: 100%
Activity is 10,000 transactions a day on contract MasterChef.sol, as indicated in the Appendix.

Guidance:

100% More than 10 transactions a day 70% More than 10 transactions a week 40% More than 10 transactions a month 10% Less than 10 transactions a month 0% No activity

3) Is there a public software repository? (Y/N)

Answer: Yes
Is there a public software repository with the code at a minimum, but also normally test and scripts. Even if the repository was created just to hold the files and has just 1 transaction, it gets a "Yes". For teams with private repositories, this answer is "No".

4) Is there a development history visible? (%)

Answer: 0%
With 13 commits and 1 branch, this is an unhealthy software repository.
This metric checks if the software repository demonstrates a strong steady history. This is normally demonstrated by commits, branches and releases in a software repository. A healthy history demonstrates a history of more than a month (at a minimum).
Guidance: 100% Any one of 100+ commits, 10+branches 70% Any one of 70+ commits, 7+branches 50% Any one of 50+ commits, 5+branches 30% Any one of 30+ commits, 3+branches 0% Less than 2 branches or less than 30 commits

How to improve this score:

Continue to test and perform other verification activities after deployment, including routine maintenance updating to new releases of testing and deployment tools. A public development history indicates clearly to the public the level of continued investment and activity by the developers on the application. This gives a level of security and faith in the application.

5) Is the team public (not anonymous)? (Y/N)

Answer: Yes
Two of the team members are public, as seen on their Youtube Page.
For a "Yes" in this question, the real names of some team members must be public on the website or other documentation (LinkedIn, etc). If the team is anonymous, then this question is a "No".

Documentation

This section looks at the software documentation. The document explaining these questions is here.
Required questions are;
6) Is there a whitepaper? (Y/N) 7) Are the basic software functions documented? (Y/N) 8) Does the software function documentation fully (100%) cover the deployed contracts? (%) 9) Are there sufficiently detailed comments for all functions within the deployed contract code (%) 10) Is it possible to trace from software documentation to the implementation in code (%)

6) Is there a whitepaper? (Y/N)

Answer: Yes

7) Are the basic software functions documented? (Y/N)

Answer: Yes
Robust software functions are documented Here.

How to improve this score:

Write the document based on the deployed code. For guidance, refer to the SecurEth System Description Document.

8) Does the software function documentation fully (100%) cover the deployed contracts? (%)

Answer: 80%
Robust software function documentation is found here.
Guidance:
100% All contracts and functions documented 80% Only the major functions documented 79-1% Estimate of the level of software documentation 0% No software documentation

How to improve this score:

This score can be improved by adding content to the software functions document such that it comprehensively covers the requirements. For guidance, refer to the SecurEth System Description Document. Using tools that aid traceability detection will help.

9) Are there sufficiently detailed comments for all functions within the deployed contract code (%)

Answer: 39%
Code examples are in the Appendix. As per the SLOC, there is 39% commenting to code (CtC).
The Comments to Code (CtC) ratio is the primary metric for this score.
Guidance: 100% CtC > 100 Useful comments consistently on all code 90-70% CtC > 70 Useful comment on most code 60-20% CtC > 20 Some useful commenting 0% CtC < 20 No useful commenting

How to improve this score

This score can improve by adding comments to the deployed code such that it comprehensively covers the code. For guidance, refer to the SecurEth Software Requirements.

10) Is it possible to trace from software documentation to the implementation in code (%)

Answer: 100%
Clear explicit traceability between code and documentation at a requirement level for all code
Guidance: 100% Clear explicit traceability between code and documentation at a requirement level for all code 60% Clear association between code and documents via non explicit traceability 40% Documentation lists all the functions and describes their functions 0% No connection between documentation and code

How to improve this score:

This score can improve by adding traceability from documentation to code such that it is clear where each outlined function is coded in the source code. For reference, check the SecurEth guidelines on traceability.

Testing

This section looks at the software testing available. It is explained in this document. This section answers the following questions;
11) Full test suite (Covers all the deployed code) (%) 12) Code coverage (Covers all the deployed lines of code, or explains misses) (%) 13) Scripts and instructions to run the tests (Y/N) 14) Report of the results (%) 15) Formal Verification test done (%) 16) Stress Testing environment (%)

11) Is there a Full test suite? (%)

Answer: 0%
There is no testing suite in Mai Finance's GitHub repository.
This score is guided by the Test to Code ratio (TtC). Generally a good test to code ratio is over 100%. However the reviewers best judgement is the final deciding factor.
Guidance: 100% TtC > 120% Both unit and system test visible 80% TtC > 80% Both unit and system test visible 40% TtC < 80% Some tests visible 0% No tests obvious

How to improve this score:

This score can improved by adding tests to fully cover the code. Document what is covered by traceability or test results in the software repository.

12) Code coverage (Covers all the deployed lines of code, or explains misses) (%)

Answer: 0%
No evidence of Mai Finance code coverage was found in their documentation or GitHub repositories.
Guidance: 100% Documented full coverage 99-51% Value of test coverage from documented results 50% No indication of code coverage but clearly there is a reasonably complete set of tests 30% Some tests evident but not complete 0% No test for coverage seen

How to improve this score:

This score can improved by adding tests that achieve full code coverage. A clear report and scripts in the software repository will guarantee a high score.

13) Scripts and instructions to run the tests (Y/N)

Answer: Yes

14) Report of the results (%)

Answer: 50%
No testing suite, but Mai Finance has a passing MythX score, which indicates the existence of some tests.
Guidance: 100% Detailed test report as described below 70% GitHub Code coverage report visible 0% No test report evident

How to improve this score

Add a report with the results. The test scripts should generate the report or elements of it.

15) Formal Verification test done (%)

Answer: 0%
There is no evidence of a Mai Finance Formal Verification test in any of their documentation or in web searches.

16) Stress Testing environment (%)

Answer: 0%
There is evidence of Mai Finance test-net smart contract addresses usage at https://0xlaozi.medium.com/your-guide-to-making-stablecoins-with-matic-5e31f61add0c, BUT there are no published TestNet addresses, and the TestNet website they linked in the article has been taken down.

Security

This section looks at the 3rd party software audits done. It is explained in this document. This section answers the following questions;
17) Did 3rd Party audits take place? (%) 18) Is the bounty value acceptably high?

17) Did 3rd Party audits take place? (%)

Answer: 90%
Mai Finance was launched in April 2021.
Note: Most fix recommendations were implemented by the Mai Finance team.
Guidance: 100% Multiple Audits performed before deployment and results public and implemented or not required 90% Single audit performed before deployment and results public and implemented or not required 70% Audit(s) performed after deployment and no changes required. Audit report is public
50% Audit(s) performed after deployment and changes needed but not implemented 20% No audit performed 0% Audit Performed after deployment, existence is public, report is not public and no improvements deployed OR smart contract address' not found, question
Deduct 25% if code is in a private repo and no note from auditors that audit is applicable to deployed code

18) Is the bounty value acceptably high (%)

Answer: 0%
Mai Finance are a part of EthOdyssey and the Polygon Hackathon. However, upon further inspection, these programs do not seem to offer rewards for finding bugs in the Mai protocol, but rather it is a developer contest for finding ways to add support to the Polygon chain.
Guidance:
100% Bounty is 10% TVL or at least $1M AND active program (see below) 90% Bounty is 5% TVL or at least 500k AND active program 80% Bounty is 5% TVL or at least 500k 70% Bounty is 100k or over AND active program 60% Bounty is 100k or over 50% Bounty is 50k or over AND active program 40% Bounty is 50k or over 20% Bug bounty program bounty is less than 50k 0% No bug bounty program offered
An active program means that a third party (such as Immunefi) is actively driving hackers to the site. An inactive program would be static mentions on the docs.

Access Controls

This section covers the documentation of special access controls for a DeFi protocol. The admin access controls are the contracts that allow updating contracts or coefficients in the protocol. Since these contracts can allow the protocol admins to "change the rules", complete disclosure of capabilities is vital for user's transparency. It is explained in this document. The questions this section asks are as follow;
19) Can a user clearly and quickly find the status of the admin controls? 20) Is the information clear and complete? 21) Is the information in non-technical terms that pertain to the investments? 22) Is there Pause Control documentation including records of tests?

19) Can a user clearly and quickly find the status of the access controls (%)

Answer: 100%
The Mai Finance access controls can easily be found in the "Risks" section of their GitBooks.
Guidance: 100% Clearly labelled and on website, docs or repo, quick to find 70% Clearly labelled and on website, docs or repo but takes a bit of looking 40% Access control docs in multiple places and not well labelled 20% Access control docs in multiple places and not labelled 0% Admin Control information could not be found

20) Is the information clear and complete (%)

Answer: 90%
a) Documentation clearly outlines the upgradeability of the contracts
b) OnlyOwner is implied in the Mai Finance GitBooks, and clearly outlined in the Owned.sol contract.
c) The capabilities for change in the contracts are clearly outlined here.
Guidance: All the contracts are immutable -- 100% OR
a) All contracts are clearly labelled as upgradeable (or not) -- 30% AND b) The type of ownership is clearly indicated (OnlyOwner / MultiSig / Defined Roles) -- 30% AND c) The capabilities for change in the contracts are described -- 30%

How to improve this score:

Create a document that covers the items described above. An example is enclosed.

21) Is the information in non-technical terms that pertain to the investments (%)

Answer: 90%
Most of the information found in the Mai Finance documentation is written in non-technical language. A good example of this can be found here.
Guidance: 100% All the contracts are immutable 90% Description relates to investments safety and updates in clear, complete non-software l language 30% Description all in software specific language 0% No admin control information could not be found

How to improve this score:

Create a document that covers the items described above in plain language that investors can understand. An example is enclosed.

22) Is there Pause Control documentation including records of tests (%)

Answer: 80%
It is indicated that none of the contracts are pausable in the "smart contracts" section of their documentation.
Guidance: 100% All the contracts are immutable or no pause control needed and this is explained OR 100% Pause control(s) are clearly documented and there is records of at least one test within 3 months 80% Pause control(s) explained clearly but no evidence of regular tests 40% Pause controls mentioned with no detail on capability or tests 0% Pause control not documented or explained

How to improve this score:

Create a document that covers the items described above in plain language that investors can understand. An example is enclosed.

Appendices

Author Details

The author of this review is Rex of DeFi Safety.
Email : [email protected] Twitter : @defisafety
I started with Ethereum just before the DAO and that was a wonderful education. It showed the importance of code quality. The second Parity hack also showed the importance of good process. Here my aviation background offers some value. Aerospace knows how to make reliable code using quality processes.
I was coaxed to go to EthDenver 2018 and there I started SecuEth.org with Bryant and Roman. We created guidelines on good processes for blockchain code development. We got EthFoundation funding to assist in their development.
Process Quality Reviews are an extension of the SecurEth guidelines that will further increase the quality processes in Solidity and Vyper development.
DeFiSafety is my full time gig and we are working on funding vehicles for a permanent staff.

Scoring Appendix

Executing Code Appendix

Code Used Appendix

Example Code Appendix

1
// Farm distributes the ERC20 rewards based on staked LP to each user.
2
//
3
// Cloned from https://github.com/SashimiProject/sashimiswap/blob/master/contracts/MasterChef.sol
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// Modified by Manhattan Finance to work for non-mintable ERC20.
5
contract Farm is Ownable, ReentrancyGuard {
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using SafeMath for uint256;
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using SafeERC20 for IERC20;
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// Info of each user.
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struct UserInfo {
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uint256 amount; // How many LP tokens the user has provided.
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uint256 rewardDebt; // Reward debt. See explanation below.
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//
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// We do some fancy math here. Basically, any point in time, the amount of ERC20s
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// entitled to a user but is pending to be distributed is:
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//
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// pending reward = (user.amount * pool.accERC20PerShare) - user.rewardDebt
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//
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// Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
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// 1. The pool's `accERC20PerShare` (and `lastRewardBlock`) gets updated.
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// 2. User receives the pending reward sent to his/her address.
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// 3. User's `amount` gets updated.
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// 4. User's `rewardDebt` gets updated.
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}
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// Info of each pool.
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struct PoolInfo {
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IERC20 lpToken; // Address of LP token contract.
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uint256 allocPoint; // How many allocation points assigned to this pool. ERC20s to distribute per block.
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uint256 lastRewardBlock; // Last block number that ERC20s distribution occurs.
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uint256 accERC20PerShare; // Accumulated ERC20s per share, times 1e12.
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uint16 depositFeeBP; // Deposit fee in basis points
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}
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// Address of the ERC20 Token contract.
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IERC20 public erc20;
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// The total amount of ERC20 that's paid out as reward.
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uint256 public paidOut = 0;
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// ERC20 tokens rewarded per block.
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uint256 public rewardPerBlock;
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// Info of each pool.
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PoolInfo[] public poolInfo;
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// Info of each user that stakes LP tokens.
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mapping (uint256 => mapping (address => UserInfo)) public userInfo;
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// Total allocation points. Must be the sum of all allocation points in all pools.
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uint256 public totalAllocPoint = 0;
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// The block number when farming starts.
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uint256 public startBlock;
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// The block number when farming ends.
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uint256 public endBlock;
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// Deposit Fee address
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address public feeAddress;
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event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
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event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
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event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
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constructor(IERC20 _erc20, uint256 _rewardPerBlock, uint256 _startBlock, address _feeAddress) public {
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erc20 = _erc20;
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rewardPerBlock = _rewardPerBlock;
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startBlock = _startBlock;
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endBlock = _startBlock;
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feeAddress = _feeAddress;
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}
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function setFeeAddress(address _feeAddress) public {
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require(msg.sender == feeAddress, "setFeeAddress: FORBIDDEN");
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feeAddress = _feeAddress;
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}
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// Number of LP pools
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function poolLength() external view returns (uint256) {
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return poolInfo.length;
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}
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// Fund the farm, increase the end block
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function fund(uint256 _amount) public onlyOwner {
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require(block.number < endBlock, "fund: too late, the farm is closed");
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erc20.safeTransferFrom(address(msg.sender), address(this), _amount);
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endBlock += _amount.div(rewardPerBlock);
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}
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// Add a new lp to the pool. Can only be called by the owner.
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// DO NOT add the same LP token more than once. Rewards will be messed up if you do.
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function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate, uint16 _depositFeeBP) public onlyOwner {
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require(_depositFeeBP <= 10000, "add: invalid deposit fee basis points");
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if (_withUpdate) {
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massUpdatePools();
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}
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uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
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totalAllocPoint = totalAllocPoint.add(_allocPoint);
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poolInfo.push(PoolInfo({
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lpToken: _lpToken,
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allocPoint: _allocPoint,
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lastRewardBlock: lastRewardBlock,
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accERC20PerShare: 0,
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depositFeeBP : _depositFeeBP
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}));
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}
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// Update the given pool's ERC20 allocation point. Can only be called by the owner.
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function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
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if (_withUpdate) {
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massUpdatePools();
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}
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totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
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poolInfo[_pid].allocPoint = _allocPoint;
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}
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// View function to see deposited LP for a user.
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function deposited(uint256 _pid, address _user) external view returns (uint256) {
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UserInfo storage user = userInfo[_pid][_user];
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return user.amount;
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}
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/ View function to see pending ERC20s for a user.
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function pending(uint256 _pid, address _user) external view returns (uint256) {
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PoolInfo storage pool = poolInfo[_pid];
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UserInfo storage user = userInfo[_pid][_user];
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uint256 accERC20PerShare = pool.accERC20PerShare;
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uint256 lpSupply = pool.lpToken.balanceOf(address(this));
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if (block.number > pool.lastRewardBlock && lpSupply != 0) {
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uint256 lastBlock = block.number < endBlock ? block.number : endBlock;
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uint256 nrOfBlocks = lastBlock.sub(pool.lastRewardBlock);
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uint256 erc20Reward = nrOfBlocks.mul(rewardPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
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accERC20PerShare = accERC20PerShare.add(erc20Reward.mul(1e12).div(lpSupply));
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}
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return user.amount.mul(accERC20PerShare).div(1e12).sub(user.rewardDebt);
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}
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/ View function for total reward the farm has yet to pay out.
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function totalPending() external view returns (uint256) {
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if (block.number <= startBlock) {
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return 0;
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}
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uint256 lastBlock = block.number < endBlock ? block.number : endBlock;
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return rewardPerBlock.mul(lastBlock - startBlock).sub(paidOut);
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}
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// Update reward variables for all pools. Be careful of gas spending!
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function massUpdatePools() public {
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uint256 length = poolInfo.length;
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for (uint256 pid = 0; pid < length; ++pid) {
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updatePool(pid);
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}
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}
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// Update reward variables of the given pool to be up-to-date.
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function updatePool(uint256 _pid) public {
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PoolInfo storage pool = poolInfo[_pid];
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uint256 lastBlock = block.number < endBlock ? block.number : endBlock;
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if (lastBlock <= pool.lastRewardBlock) {
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return;
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}
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uint256 lpSupply = pool.lpToken.balanceOf(address(this));
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if (lpSupply == 0) {
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pool.lastRewardBlock = lastBlock;
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return;
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}
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uint256 nrOfBlocks = lastBlock.sub(pool.lastRewardBlock);
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uint256 erc20Reward = nrOfBlocks.mul(rewardPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
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pool.accERC20PerShare = pool.accERC20PerShare.add(erc20Reward.mul(1e12).div(lpSupply));
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pool.lastRewardBlock = block.number;
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}
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// Deposit LP tokens to Farm for ERC20 allocation.
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function deposit(uint256 _pid, uint256 _amount) public nonReentrant {
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PoolInfo storage pool = poolInfo[_pid];
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UserInfo storage user = userInfo[_pid][msg.sender];
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updatePool(_pid);
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if (user.amount > 0) {
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uint256 pendingAmount = user.amount.mul(pool.accERC20PerShare).div(1e12).sub(user.rewardDebt);
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erc20Transfer(msg.sender, pendingAmount);
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}
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if (_amount > 0) {
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pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
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if (pool.depositFeeBP > 0) {
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uint256 depositFee = _amount.mul(pool.depositFeeBP).div(10000);
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pool.lpToken.safeTransfer(feeAddress, depositFee);
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user.amount = user.amount.add(_amount).sub(depositFee);
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} else {
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user.amount = user.amount.add(_amount);
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}
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}
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user.rewardDebt = user.amount.mul(pool.accERC20PerShare).div(1e12);
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emit Deposit(msg.sender, _pid, _amount);
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}
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// Withdraw LP tokens from Farm.
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function withdraw(uint256 _pid, uint256 _amount) public nonReentrant {
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PoolInfo storage pool = poolInfo[_pid];
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UserInfo storage user = userInfo[_pid][msg.sender];
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require(user.amount >= _amount, "withdraw: can't withdraw more than deposit");
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updatePool(_pid);
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uint256 pendingAmount = user.amount.mul(pool.accERC20PerShare).div(1e12).sub(user.rewardDebt);
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erc20Transfer(msg.sender, pendingAmount);
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user.amount = user.amount.sub(_amount);
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user.rewardDebt = user.amount.mul(pool.accERC20PerShare).div(1e12);
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pool.lpToken.safeTransfer(address(msg.sender), _amount);
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emit Withdraw(msg.sender, _pid, _amount);
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}
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// Withdraw without caring about rewards. EMERGENCY ONLY.
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function emergencyWithdraw(uint256 _pid) public nonReentrant {
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PoolInfo storage pool = poolInfo[_pid];
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UserInfo storage user = userInfo[_pid][msg.sender];
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pool.lpToken.safeTransfer(address(msg.sender), user.amount);
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emit EmergencyWithdraw(msg.sender, _pid, user.amount);
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user.amount = 0;
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user.rewardDebt = 0;
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}
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// Transfer ERC20 and update the required ERC20 to payout all rewards
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function erc20Transfer(address _to, uint256 _amount) internal {
226
erc20.transfer(_to, _amount);
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paidOut += _amount;
228
}
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SLOC Appendix

Solidity Contracts

Language
Files
Lines
Blanks
Comments
Code
Complexity
Solidity
15
1844
383
410
1051
70
Comments to Code 410/1051 = 39%

Javascript Tests

Language
Files
Lines
Blanks
Comments
Code
Complexity
JavaScript
N/A
N/A
N/A
N/A
N/A
N/A
Tests to Code = N/A
Last modified 5d ago