`@0x/contracts-broker`: Property-based Gods Unchained orders #2455

moodlezoup · 2020-01-24T00:35:39Z

Description

Implements the Broker and GodsUnchainedValidator contracts, as described in 0xProject/ZEIPs#75
Also moves LibAssetDataTransfer from @0x/contracts-exchange-forwarder to @0x/contracts-exchange-libs.

A couple of things to note:

The Broker currently doesn't support orders with taker fees. This is because, like the Forwarder, the Broker serves as the taker of the order, so the taker fee asset would need to be transferred to the Broker prior to the fill (more approvals to be set by the actual taker, etc.). You can't mix and match property-based and vanilla orders in batchBrokerTrade for the same reason.
Could add msg.sender checks to the fallback and safeBatchTransferFrom.
The way that the takerAssetAmount and the nested 1155 amounts work together is somewhat interesting for brokered assets. Refer to the comment above encodeBrokerAssetData for details
Right now safeBatchTransferFrom is fairly opinionated in that it enforces that from == address(this) and assumes the brokered asset is 721. Generalizing this could open up a few interesting use cases, but this can wait for a later iteration.

Testing instructions

Unit tests for the GodsUnchainedValidator contract are found in the new @0x/contracts-broker package, while Broker <> GodsUnchainedValidator integration tests are in @0x/contracts-integrations

Types of changes

Checklist:

Prefix PR title with [WIP] if necessary.
Add tests to cover changes as needed.
Update documentation as needed.
Add new entries to the relevant CHANGELOG.jsons.

buildsize · 2020-01-24T00:55:08Z

File name	Previous Size	New Size	Change
init.py	60.43 KB	60.43 KB	0 bytes (0%)
abi_gen_dummy.ts	85.45 KB	[deleted]
lib_dummy.ts	7.13 KB	[deleted]
test_lib_dummy.ts	10.56 KB	[deleted]
environment.pickle	1.72 MB	1.72 MB	0 bytes (0%)
index.doctree	436.61 KB	436.61 KB	0 bytes (0%)
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genindex.html	31.42 KB	31.42 KB	0 bytes (0%)
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underscore.js	11.86 KB	11.86 KB	0 bytes (0%)
contract_addresses.html	16.8 KB	16.8 KB	0 bytes (0%)
contract_artifacts.html	8.24 KB	8.24 KB	0 bytes (0%)
json_schemas.html	12.56 KB	12.56 KB	0 bytes (0%)
order_utils.html	47.16 KB	47.16 KB	0 bytes (0%)
erc20_token.html	93.56 KB	93.56 KB	0 bytes (0%)
exchange.html	730.72 KB	730.72 KB	0 bytes (0%)
tx_params.html	9.41 KB	9.41 KB	0 bytes (0%)
local_message_signer.html	15.08 KB	15.08 KB	0 bytes (0%)
asset_data_utils.html	22.66 KB	22.66 KB	0 bytes (0%)
asset_proxy_owner.html	337.39 KB	337.39 KB	0 bytes (0%)
coordinator.html	128.72 KB	128.72 KB	0 bytes (0%)
coordinator_registry.html	39.59 KB	39.59 KB	0 bytes (0%)
dutch_auction.html	66.13 KB	66.13 KB	0 bytes (0%)
erc20_proxy.html	111.83 KB	111.83 KB	0 bytes (0%)
erc721_proxy.html	111.95 KB	111.95 KB	0 bytes (0%)
erc721_token.html	150.2 KB	150.2 KB	0 bytes (0%)
forwarder.html	130.08 KB	130.08 KB	0 bytes (0%)
i_asset_proxy.html	40.18 KB	40.18 KB	0 bytes (0%)
i_validator.html	27.06 KB	27.06 KB	0 bytes (0%)
i_wallet.html	24.9 KB	24.9 KB	0 bytes (0%)
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weth9.html	133.39 KB	133.39 KB	0 bytes (0%)
zrx_token.html	107.61 KB	107.61 KB	0 bytes (0%)
dev_utils.html	593.43 KB	593.43 KB	0 bytes (0%)
types.html	8.54 KB	8.54 KB	0 bytes (0%)
erc1155_mintable.html	276.51 KB	276.51 KB	0 bytes (0%)
erc1155_proxy.html	133.15 KB	133.15 KB	0 bytes (0%)
static_call_proxy.html	34.04 KB	34.04 KB	0 bytes (0%)
relayer_api.html	113.37 KB	113.37 KB	0 bytes (0%)
relayer_api_asset_data_pairs_response_schema.html	13.86 KB	13.86 KB	0 bytes (0%)
relayer_api_asset_data_trade_info_schema.html	23.09 KB	23.09 KB	0 bytes (0%)
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relayer_api_error_response_schema_validation_errors.html	19.92 KB	19.92 KB	0 bytes (0%)
relayer_api_fee_recipients_response_schema.html	13.83 KB	13.83 KB	0 bytes (0%)
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relayer_api_orders_channel_update_schema.html	22.83 KB	22.83 KB	0 bytes (0%)
relayer_api_orders_response_schema.html	13.75 KB	13.75 KB	0 bytes (0%)
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coveralls · 2020-01-24T01:05:42Z

Coverage increased (+0.1%) to 79.739% when pulling 0691cc7 on feature/broker/gods-unchained into f9c9b9f on development.

abandeali1

Nice work! I really like the simplicity of this design.

abandeali1 · 2020-01-29T21:57:10Z

contracts/broker/contracts/src/Broker.sol

+    )
+        external
+    {
+        if (from != address(this)) {


Why not just ignore the from parameter and always use address(this)?

I put this in to handle the case where e.g, makerFeeAssetData = takerAssetData both point to the Broker. Without this check, the Broker would send one of the taker's assets to the fee recipient, but this would be disguised as a maker fee

Could this also be an issue for the taker fee? There's nothing explicitly preventing filling an order w/ a taker fee right?

Yeah, I suppose so, but at least if the takerFee is non-zero the taker should expect to be sending something to the maker, so it's kinda on them/the front-end to surface what that thing is. Also I can't really think of an easy way for the Broker to distinguish between a taker -> maker transfer vs a taker -> feeRecipient transfer

contracts/broker/contracts/src/Broker.sol

abandeali1 · 2020-01-29T22:58:04Z

contracts/broker/contracts/src/Broker.sol

+        uint256[] calldata amounts,
+        bytes calldata data
+    )
+        external


We should add a modifier that checks to make sure msg.sender == ERC1155Proxy here.

should we check that msg.sender == _EXCHANGE in the fallback while we're at it?

or I guess if we go with the WETH wrapping/unwrapping approach, msg.sender == _WETH

contracts/broker/contracts/src/Broker.sol

abandeali1 · 2020-01-30T13:55:09Z

contracts/broker/contracts/src/Broker.sol

+    /// @param fillFunctionSelector The selector for either `fillOrder` or `fillOrKillOrder`.
+    /// @return fillResults Amounts filled and fees paid by the maker and taker.
+    function brokerTrade(
+        bytes[] memory brokeredAssets,


Since these will always be 721 tokens, do we actually need any information other than the token IDs? It would be much cheaper to only cache a uint256[] if we could get away with it.

yeah, we can encode the token address in the 1155 asset data at the cost of a little generality
alternatively, I suppose we could save one storage word per asset while retaining full generality by using abi.encode(tokenAddress, tokenId) instead of the assetData

abandeali1 · 2020-01-30T14:40:04Z

contracts/broker/contracts/src/Broker.sol

+
+        // Clear storage
+        delete _cachedAssetData;
+        _cacheIndex = 0;


We don't actually need this for a single fill right?

We do in the case that the order's takerAssetAmount > 1.

contracts/broker/contracts/src/interfaces/IPropertyValidator.sol

dorothy-zbornak

This is really elegant! Still gonna think about it a bit more before approving but I'm really digging it so far.

Integration tests even look nice or w/e 🙄

dorothy-zbornak · 2020-01-30T17:14:13Z

contracts/broker/contracts/src/Broker.sol

+    bytes[] internal _cachedAssetData;
+    uint256 internal _cacheIndex;
+    address internal _sender;
+    address internal _EXCHANGE; // solhint-disable-line var-name-mixedcase


Could we get comments for these?

contracts/broker/contracts/src/validators/GodsUnchainedValidator.sol

contracts/broker/contracts/src/Broker.sol

abandeali1 · 2020-01-30T18:42:29Z

Another thought - if this contract approves the StakingProxy to spend its WETH balance, then filling WETH denominated orders wouldn't require ETH to be sent with the transaction in order to cover the protocol fee. This seems like it could be a pretty large UX improvement.

moodlezoup · 2020-01-30T20:04:02Z

Another thought - if this contract approves the StakingProxy to spend it's WETH balance, then filling WETH denominated orders wouldn't require ETH to be sent with the transaction. This seems like it could be a pretty large UX improvement.

hm, that's an interesting thought... I guess this would look like:

Broker wraps msg.value into WETH, if any ETH is provided in the call
All protocol fees are paid in WETH (either supplied by the taker or acquired from the maker during settlement)
And at the end:

for (uint256 i = 0; i < orders.length; i++) {
    if (orders[i].makerAssetData != WETH) {
        orders[i].makerAssetData.transferOut(fillResults[i].makerAssetFilledAmount);
    }
}
ETHER_TOKEN.withdraw(remainingWethBalance);
msg.sender.transfer(remainingWethBalance);

abandeali1 · 2020-01-30T20:21:07Z

I don't think you'd actually need to do any wrapping/unwrapping. The Broker receives WETH as part of the trade and then uses that to pay protocol fees automatically if msg.value is 0. The only change we'd really need to change is subtract protocolFeePaid in the transferOut call when makerAssetData == wethAssetData && msg.value == 0.

moodlezoup · 2020-01-30T21:42:26Z

I don't think you'd actually need to do any wrapping/unwrapping. The Broker receives WETH as part of the trade and then uses that to pay protocol fees automatically if msg.value is 0. The only change we'd really need to make is subtract protocolFeePaid in the transferOut call when makerAssetData == wethAssetData && msg.value == 0.

This would cause problems if msg.value = 1 or e.g. if the makerAssetAmount of WETH is not enough to cover all the protocol fees in the transaction and the taker needs to supply some ETH to make up the difference

abandeali1 · 2020-01-30T22:40:49Z

True, but nothing is stopping anyone from including ETH in the transaction if the makerAssetAmount < protocolFee. Also msg.value = 1 already breaks protocol fees (msg.value == protocolFee || msg.value == 0 must be true).

moodlezoup · 2020-01-30T23:03:55Z

Not sure if I follow –– If 0 < msg.value < protocolFee the Exchange/StakingProxy will fall back to paying the protocol fee in WETH. So if this is the case, and the Broker uses WETH acquired from the makerAssetData to pay the protocol fee, we'd need to subtract protocolFeePaid from the transferOut amount even though msg.value > 0.

abandeali1 · 2020-01-30T23:13:36Z

Nvm you're right. I was thinking about how the StakingProxy handles receiving protocol fees, not how the Exchange handles sending them to the StakingProxy.

Wrapping/unwrapping seems like the most logical approach to handle all of the edge cases then. Pretty much exactly what the Forwarder does.

moodlezoup · 2020-01-31T01:21:13Z

I guess at that point we might as well approve the ERC20Proxy as well, as this would enable WETH taker fees and filling orders with takerAssetData = WETH

dorothy-zbornak · 2020-01-31T13:44:43Z

contracts/broker/contracts/src/Broker.sol

+    /// @param to This should be the maker of the order.
+    /// @param amounts Should be an array of just one `uint256`, specifying the amount of the brokered assets to transfer.
+    /// @param data Encodes the validator contract address and any auxiliary data it needs for property validation.
+    function safeBatchTransferFrom(


OK, so here is my admittedly kind of lame attack vector for this and why we should probably be checking that msg.sender == ERC1155Proxy:

Maker creates one of these orders with makerFeeAssetData = ERC1155(...) and feeRecipient == maker.

Taker is like, w/e not my fee not my problem so I'll fill this order.

Taker is also like, my sloppy ass will pass in more ERC721s than the fill/order wants because the broker shouldn't use them anyway.

Exchange fills taker -> maker, which leaves behind the excess ERC721s "in" the broker contract.

Exchange then fills maker fee, which is an 1155 so it calls onERC1155BatchReceived() on maker which, surprise, is a smart contract.

In onERC1155BatchReceived() the maker calls broker.safeBatchTransferFrom(address(broker), maker, [], [1], hex"0x...")

Maker walks away with an extra ERC721.

This is actually the scenario that the if (from != address(this)) protects against. But yeah, I'm going to add a msg.sender == ERC1155Proxy check just in case we're missing an edge case

dorothy-zbornak · 2020-01-31T13:47:40Z

contracts/broker/contracts/src/Broker.sol

+    )
+        external
+    {
+        if (from != address(this)) {


Could this also be an issue for the taker fee? There's nothing explicitly preventing filling an order w/ a taker fee right?

moodlezoup · 2020-02-01T01:26:44Z

Added forwarder-like affiliate fees and WETH support
Refactored the Forwarder a good deal, most notably moved LibAssetDataTransfer and MixinWeth into @0x/contracts-extensions so that they can be reused between the Broker and Forwarder. (Also I deleted everything that was previously in the extensions🚶)

dorothy-zbornak

Seems legit! 👍

dorothy-zbornak · 2020-02-02T08:45:50Z

contracts/extensions/CHANGELOG.json

+        "version": "6.0.0",
+        "changes": [
+            {
+                "note": "New year, new me: remove everything, add MixinWethUtils and LibAssetDataTransfer",


dorothy-zbornak · 2020-02-03T14:58:10Z

contracts/dev-utils/README.md

-PKG=@0x/contracts-extensions yarn build
+PKG=@0x/contracts-dev-utils yarn build


abandeali1

Awesome, this is is really good shape! The refactors to the Forwarder are also 🔥 .

abandeali1 · 2020-02-03T21:46:27Z

contracts/extensions/contracts/src/MixinWethUtils.sol

-    /// @param initialWethAmount Amount of WETH available after transferring affiliate fees.
-    /// @param wethSpent Amount of WETH spent when filling orders.
+    /// @dev Unwraps and refunds WETH to msg.sender.
+    /// @param refundAmount Amount of WETH balance to refund.
    function _transferEthRefund(


Nit: now that this is in a more generic package, it probably makes sense to give this a more generic name. The first name that comes to mind is withdrawAndTransferEth.

moodlezoup changed the title ~~@0x/contracts-broker: Property-based Gods Unchained orders~~ [placeholder] @0x/contracts-broker: Property-based Gods Unchained orders Jan 24, 2020

moodlezoup force-pushed the feature/broker/gods-unchained branch 2 times, most recently from 19e2559 to bebf90f Compare January 24, 2020 00:45

moodlezoup changed the title ~~[placeholder] @0x/contracts-broker: Property-based Gods Unchained orders~~ [WIP] @0x/contracts-broker: Property-based Gods Unchained orders Jan 27, 2020

moodlezoup force-pushed the feature/broker/gods-unchained branch 2 times, most recently from 9be5661 to 2a4a419 Compare January 28, 2020 20:13

moodlezoup mentioned this pull request Jan 28, 2020

Property-based Orders Redux 0xProject/ZEIPs#75

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moodlezoup force-pushed the feature/broker/gods-unchained branch 6 times, most recently from 9992650 to 1fc449b Compare January 29, 2020 03:17

moodlezoup changed the title ~~[WIP] @0x/contracts-broker: Property-based Gods Unchained orders~~ @0x/contracts-broker: Property-based Gods Unchained orders Jan 29, 2020

moodlezoup marked this pull request as ready for review January 29, 2020 03:31

moodlezoup requested review from abandeali1 and hysz as code owners January 29, 2020 03:31

moodlezoup force-pushed the feature/broker/gods-unchained branch from 1fc449b to c5267b6 Compare January 29, 2020 04:44

abandeali1 suggested changes Jan 30, 2020

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moodlezoup force-pushed the feature/broker/gods-unchained branch from 259c389 to f02dc29 Compare February 1, 2020 01:23

moodlezoup force-pushed the feature/broker/gods-unchained branch from f02dc29 to efe200e Compare February 1, 2020 01:28

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moodlezoup force-pushed the feature/broker/gods-unchained branch from efe200e to d0865b2 Compare February 1, 2020 01:39

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moodlezoup force-pushed the feature/broker/gods-unchained branch 2 times, most recently from f44c2e4 to eb4c697 Compare February 4, 2020 04:48

moodlezoup added 15 commits February 4, 2020 10:04

create contracts-broker package

5bbbae5

Broker contracts

a98c95b

GodsUnchainedValidator unit tests

2f311f7

Broker integrations tests

1027ee2

lint

b8ac9c2

Update Broker README

c581f1b

Add Broker rich errors

c5e0de5

Move LibAssetDataTransfer from forwarder to exchange-libs package

3da7c5d

more integrations tests

403cabb

Add comments

4ab5951

skip coordinator client test

a2fcab4

Move LibAssetDataTransfer and MixinWeth(Utils) to contracts-extensions

3297194

Address PR feedback and add support for affiliate fees

d2313b3

add weth-related integration tests

d82f34f

rename _transferEthRefund -> _unwrapAndTransferEth

0691cc7

moodlezoup force-pushed the feature/broker/gods-unchained branch from eb4c697 to 0691cc7 Compare February 4, 2020 18:13

moodlezoup merged commit 93dcb68 into development Feb 4, 2020

moodlezoup deleted the feature/broker/gods-unchained branch February 4, 2020 18:53

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`@0x/contracts-broker`: Property-based Gods Unchained orders #2455

`@0x/contracts-broker`: Property-based Gods Unchained orders #2455

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		PKG=@0x/contracts-extensions yarn build
		PKG=@0x/contracts-dev-utils yarn build

@0x/contracts-broker: Property-based Gods Unchained orders #2455

@0x/contracts-broker: Property-based Gods Unchained orders #2455

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`@0x/contracts-broker`: Property-based Gods Unchained orders #2455

`@0x/contracts-broker`: Property-based Gods Unchained orders #2455

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