dagger-contracts/contracts/Marketplace.sol

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./Configuration.sol";
import "./Requests.sol";
import "./Collateral.sol";
import "./Proofs.sol";
import "./StateRetrieval.sol";
contract Marketplace is Collateral, Proofs, StateRetrieval {
using EnumerableSet for EnumerableSet.Bytes32Set;
using Requests for Request;
MarketplaceConfig public config;
MarketplaceFunds private funds;
mapping(RequestId => Request) private requests;
mapping(RequestId => RequestContext) private requestContexts;
mapping(SlotId => Slot) private slots;
struct RequestContext {
RequestState state;
uint256 slotsFilled;
uint256 startedAt;
uint256 endsAt;
}
struct Slot {
SlotState state;
RequestId requestId;
address host;
}
constructor(
IERC20 token,
MarketplaceConfig memory configuration
) Collateral(token) Proofs(configuration.proofs) marketplaceInvariant {
config = configuration;
}
function isWithdrawAllowed() internal view override returns (bool) {
return !hasSlots(msg.sender);
}
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function requestStorage(
Request calldata request
) public marketplaceInvariant {
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require(request.client == msg.sender, "Invalid client address");
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RequestId id = request.id();
require(requests[id].client == address(0), "Request already exists");
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requests[id] = request;
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requestContexts[id].endsAt = block.timestamp + request.ask.duration;
addToMyRequests(request.client, id);
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uint256 amount = request.price();
funds.received += amount;
funds.balance += amount;
transferFrom(msg.sender, amount);
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emit StorageRequested(id, request.ask);
}
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function fillSlot(
RequestId requestId,
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uint256 slotIndex,
bytes calldata proof
) public requestIsKnown(requestId) {
Request storage request = requests[requestId];
require(slotIndex < request.ask.slots, "Invalid slot");
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SlotId slotId = Requests.slotId(requestId, slotIndex);
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Slot storage slot = slots[slotId];
slot.requestId = requestId;
require(slotState(slotId) == SlotState.Free, "Slot is not free");
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require(
balanceOf(msg.sender) >= config.collateral.initialAmount,
"Insufficient collateral"
);
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_startRequiringProofs(slotId, request.ask.proofProbability);
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submitProof(slotId, proof);
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slot.host = msg.sender;
slot.state = SlotState.Filled;
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RequestContext storage context = requestContexts[requestId];
context.slotsFilled += 1;
addToMySlots(slot.host, slotId);
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emit SlotFilled(requestId, slotIndex, slotId);
if (context.slotsFilled == request.ask.slots) {
context.state = RequestState.Started;
context.startedAt = block.timestamp;
emit RequestFulfilled(requestId);
}
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}
function freeSlot(SlotId slotId) public slotIsNotFree(slotId) {
Slot storage slot = slots[slotId];
require(slot.host == msg.sender, "Slot filled by other host");
SlotState state = slotState(slotId);
require(state != SlotState.Paid, "Already paid");
if (state == SlotState.Finished) {
payoutSlot(slot.requestId, slotId);
} else if (state == SlotState.Failed) {
removeFromMySlots(msg.sender, slotId);
} else if (state == SlotState.Filled) {
_forciblyFreeSlot(slotId);
}
}
function markProofAsMissing(SlotId slotId, Period period) public {
require(slotState(slotId) == SlotState.Filled, "Slot not accepting proofs");
_markProofAsMissing(slotId, period);
address host = getHost(slotId);
if (missingProofs(slotId) % config.collateral.slashCriterion == 0) {
_slash(host, config.collateral.slashPercentage);
if (balanceOf(host) < config.collateral.minimumAmount) {
// When the collateral drops below the minimum threshold, the slot
// needs to be freed so that there is enough remaining collateral to be
// distributed for repairs and rewards (with any leftover to be burnt).
_forciblyFreeSlot(slotId);
}
}
}
function _forciblyFreeSlot(SlotId slotId) internal marketplaceInvariant {
Slot storage slot = slots[slotId];
RequestId requestId = slot.requestId;
RequestContext storage context = requestContexts[requestId];
// TODO: burn host's slot collateral except for repair costs + mark proof
// missing reward
// Slot collateral is not yet implemented as the design decision was
// not finalised.
removeFromMySlots(slot.host, slotId);
slot.state = SlotState.Free;
slot.host = address(0);
slot.requestId = RequestId.wrap(0);
context.slotsFilled -= 1;
emit SlotFreed(requestId, slotId);
Request storage request = requests[requestId];
uint256 slotsLost = request.ask.slots - context.slotsFilled;
if (
slotsLost > request.ask.maxSlotLoss &&
context.state == RequestState.Started
) {
context.state = RequestState.Failed;
context.endsAt = block.timestamp - 1;
emit RequestFailed(requestId);
// TODO: burn all remaining slot collateral (note: slot collateral not
// yet implemented)
// TODO: send client remaining funds
}
}
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function payoutSlot(
RequestId requestId,
SlotId slotId
) private requestIsKnown(requestId) marketplaceInvariant {
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RequestContext storage context = requestContexts[requestId];
Request storage request = requests[requestId];
context.state = RequestState.Finished;
removeFromMyRequests(request.client, requestId);
Slot storage slot = slots[slotId];
removeFromMySlots(slot.host, slotId);
uint256 amount = requests[requestId].pricePerSlot();
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funds.sent += amount;
funds.balance -= amount;
slot.state = SlotState.Paid;
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require(token.transfer(slot.host, amount), "Payment failed");
}
/// @notice Withdraws storage request funds back to the client that deposited them.
/// @dev Request must be expired, must be in RequestState.New, and the transaction must originate from the depositer address.
/// @param requestId the id of the request
function withdrawFunds(RequestId requestId) public marketplaceInvariant {
Request storage request = requests[requestId];
require(block.timestamp > request.expiry, "Request not yet timed out");
require(request.client == msg.sender, "Invalid client address");
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RequestContext storage context = requestContexts[requestId];
require(context.state == RequestState.New, "Invalid state");
// Update request state to Cancelled. Handle in the withdraw transaction
// as there needs to be someone to pay for the gas to update the state
context.state = RequestState.Cancelled;
removeFromMyRequests(request.client, requestId);
emit RequestCancelled(requestId);
// TODO: To be changed once we start paying out hosts for the time they
// fill a slot. The amount that we paid to hosts will then have to be
// deducted from the price.
uint256 amount = request.price();
funds.sent += amount;
funds.balance -= amount;
require(token.transfer(msg.sender, amount), "Withdraw failed");
}
function getHost(SlotId slotId) public view returns (address) {
return slots[slotId].host;
}
modifier requestIsKnown(RequestId requestId) {
require(requests[requestId].client != address(0), "Unknown request");
_;
}
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function getRequest(
RequestId requestId
) public view requestIsKnown(requestId) returns (Request memory) {
return requests[requestId];
}
modifier slotIsNotFree(SlotId slotId) {
require(slots[slotId].state != SlotState.Free, "Slot is free");
_;
}
function requestEnd(RequestId requestId) public view returns (uint256) {
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uint256 end = requestContexts[requestId].endsAt;
RequestState state = requestState(requestId);
if (state == RequestState.New || state == RequestState.Started) {
return end;
} else {
return Math.min(end, block.timestamp - 1);
}
}
function requestState(
RequestId requestId
) public view requestIsKnown(requestId) returns (RequestState) {
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RequestContext storage context = requestContexts[requestId];
if (
context.state == RequestState.New &&
block.timestamp > requests[requestId].expiry
) {
return RequestState.Cancelled;
} else if (
context.state == RequestState.Started && block.timestamp > context.endsAt
) {
return RequestState.Finished;
} else {
return context.state;
}
}
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function slotState(SlotId slotId) public view override returns (SlotState) {
Slot storage slot = slots[slotId];
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if (RequestId.unwrap(slot.requestId) == 0) {
return SlotState.Free;
}
RequestState reqState = requestState(slot.requestId);
if (slot.state == SlotState.Paid) {
return SlotState.Paid;
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}
if (reqState == RequestState.Cancelled) {
return SlotState.Finished;
}
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if (reqState == RequestState.Finished) {
return SlotState.Finished;
}
if (reqState == RequestState.Failed) {
return SlotState.Failed;
}
return slot.state;
}
event StorageRequested(RequestId requestId, Ask ask);
event RequestFulfilled(RequestId indexed requestId);
event RequestFailed(RequestId indexed requestId);
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event SlotFilled(
RequestId indexed requestId,
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uint256 indexed slotIndex,
SlotId slotId
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);
event SlotFreed(RequestId indexed requestId, SlotId slotId);
event RequestCancelled(RequestId indexed requestId);
modifier marketplaceInvariant() {
MarketplaceFunds memory oldFunds = funds;
_;
assert(funds.received >= oldFunds.received);
assert(funds.sent >= oldFunds.sent);
assert(funds.received == funds.balance + funds.sent);
}
struct MarketplaceFunds {
uint256 balance;
uint256 received;
uint256 sent;
}
}