497 lines
17 KiB
Solidity
497 lines
17 KiB
Solidity
pragma solidity ^0.4.11;
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import "./LiquidPledgingBase.sol";
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contract LiquidPledging is LiquidPledgingBase {
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//////
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// Constructor
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//////
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// This constructor also calls the constructor for `LiquidPledgingBase`
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function LiquidPledging(address _vault) LiquidPledgingBase(_vault) {
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}
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/// @notice This is how value enters into the system which creates pledges;
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/// the token of value goes into the vault and the amount in the pledge
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/// relevant to this Giver without delegates is increased, and a normal
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/// transfer is done to the idReceiver
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/// @param idGiver Identifier of the giver thats donating.
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/// @param idReceiver To whom it's transfered. Can be the same giver, another
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/// giver, a delegate or a campaign
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function donate(uint64 idGiver, uint64 idReceiver) payable {
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if (idGiver == 0) {
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idGiver = addGiver('', 259200, ILiquidPledgingPlugin(0x0)); // default to 3 day commitTime
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}
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NoteManager storage sender = findManager(idGiver);
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checkManagerOwner(sender);
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require(sender.managerType == NoteManagerType.Giver);
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uint amount = msg.value;
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require(amount > 0);
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vault.transfer(amount); // transfers the baseToken to the Vault
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uint64 idNote = findNote(
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idGiver,
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new uint64[](0), //what is new?
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0,
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0,
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0,
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PaymentState.NotPaid);
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Note storage nTo = findNote(idNote);
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nTo.amount += amount;
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Transfer(0, idNote, amount);
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transfer(idGiver, idNote, amount, idReceiver);
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}
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/// @notice Moves value between notes
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/// @param idSender ID of the giver, delegate or campaign manager that is transferring
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/// the funds from Note to Note. This manager must have permissions to move the value
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/// @param idNote Id of the note that's moving the value
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/// @param amount Quantity of value that's being moved
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/// @param idReceiver Destination of the value, can be a giver sending to a giver or
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/// a delegate, a delegate to another delegate or a campaign to precommit it to that campaign
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function transfer(uint64 idSender, uint64 idNote, uint amount, uint64 idReceiver) {
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idNote = normalizeNote(idNote);
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Note storage n = findNote(idNote);
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NoteManager storage receiver = findManager(idReceiver);
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NoteManager storage sender = findManager(idSender);
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checkManagerOwner(sender);
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require(n.paymentState == PaymentState.NotPaid);
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// If the sender is the owner
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if (n.owner == idSender) {
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if (receiver.managerType == NoteManagerType.Giver) {
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transferOwnershipToGiver(idNote, amount, idReceiver);
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} else if (receiver.managerType == NoteManagerType.Campaign) {
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transferOwnershipToCampaign(idNote, amount, idReceiver);
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} else if (receiver.managerType == NoteManagerType.Delegate) {
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appendDelegate(idNote, amount, idReceiver);
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} else {
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assert(false);
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}
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return;
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}
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// If the sender is a delegate
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uint senderDIdx = getDelegateIdx(n, idSender);
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if (senderDIdx != NOTFOUND) {
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// If the receiver is another giver
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if (receiver.managerType == NoteManagerType.Giver) {
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// Only accept to change to the original giver to remove all delegates
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assert(n.owner == idReceiver);
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undelegate(idNote, amount, n.delegationChain.length);
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return;
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}
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// If the receiver is another delegate
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if (receiver.managerType == NoteManagerType.Delegate) {
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uint receiverDIdx = getDelegateIdx(n, idReceiver);
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// If the receiver is not in the delegate list
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if (receiverDIdx == NOTFOUND) {
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undelegate(idNote, amount, n.delegationChain.length - senderDIdx - 1);
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appendDelegate(idNote, amount, idReceiver);
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// If the receiver is already part of the delegate chain and is
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// after the sender, then all of the other delegates after the sender are
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// removed and the receiver is appended at the end of the delegation chain
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} else if (receiverDIdx > senderDIdx) {
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undelegate(idNote, amount, n.delegationChain.length - senderDIdx - 1);
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appendDelegate(idNote, amount, idReceiver);
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// If the receiver is already part of the delegate chain and is
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// before the sender, then the sender and all of the other
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// delegates after the RECEIVER are revomved from the chain,
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// this is interesting because the delegate undelegates from the
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// delegates that delegated to this delegate... game theory issues? should this be allowed
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} else if (receiverDIdx <= senderDIdx) {
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undelegate(idNote, amount, n.delegationChain.length - receiverDIdx -1);
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}
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return;
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}
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// If the delegate wants to support a campaign, they undelegate all
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// the delegates after them in the chain and choose a campaign
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if (receiver.managerType == NoteManagerType.Campaign) {
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undelegate(idNote, amount, n.delegationChain.length - senderDIdx - 1);
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proposeAssignCampaign(idNote, amount, idReceiver);
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return;
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}
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}
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assert(false); // It is not the owner nor any delegate.
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}
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/// @notice This method is used to withdraw value from the system. This can be used
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/// by the givers to avoid committing the donation or by campaign manager to use
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/// the Ether.
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/// @param idNote Id of the note that wants to be withdrawn.
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/// @param amount Quantity of Ether that wants to be withdrawn.
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function withdraw(uint64 idNote, uint amount) {
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idNote = normalizeNote(idNote);
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Note storage n = findNote(idNote);
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require(n.paymentState == PaymentState.NotPaid);
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NoteManager storage owner = findManager(n.owner);
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checkManagerOwner(owner);
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uint64 idNewNote = findNote(
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n.owner,
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n.delegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.Paying
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);
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doTransfer(idNote, idNewNote, amount);
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vault.authorizePayment(bytes32(idNewNote), owner.addr, amount);
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}
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/// @notice Method called by the vault to confirm a payment.
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/// @param idNote Id of the note that wants to be withdrawn.
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/// @param amount Quantity of Ether that wants to be withdrawn.
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function confirmPayment(uint64 idNote, uint amount) onlyVault {
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Note storage n = findNote(idNote);
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require(n.paymentState == PaymentState.Paying);
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// Check the campaign is not canceled in the while.
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require(getOldestNoteNotCanceled(idNote) == idNote);
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uint64 idNewNote = findNote(
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n.owner,
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n.delegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.Paid
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);
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doTransfer(idNote, idNewNote, amount);
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}
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/// @notice Method called by the vault to cancel a payment.
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/// @param idNote Id of the note that wants to be canceled for withdraw.
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/// @param amount Quantity of Ether that wants to be rolled back.
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function cancelPayment(uint64 idNote, uint amount) onlyVault {
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Note storage n = findNote(idNote);
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require(n.paymentState == PaymentState.Paying); //TODO change to revert
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// When a payment is canceled, never is assigned to a campaign.
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uint64 oldNote = findNote(
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n.owner,
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n.delegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.NotPaid
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);
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oldNote = normalizeNote(oldNote);
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doTransfer(idNote, oldNote, amount);
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}
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/// @notice Method called to cancel this campaign.
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/// @param idCampaign Id of the projct that wants to be canceled.
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function cancelCampaign(uint64 idCampaign) {
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NoteManager storage campaign = findManager(idCampaign);
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checkManagerOwner(campaign);
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campaign.canceled = true;
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CancelCampaign(idCampaign);
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}
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function cancelNote(uint64 idNote, uint amount) {
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idNote = normalizeNote(idNote);
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Note storage n = findNote(idNote);
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NoteManager storage m = findManager(n.owner);
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checkManagerOwner(m);
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doTransfer(idNote, n.oldNote, amount);
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}
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////////
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// Multi note methods
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////////
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// This set of functions makes moving a lot of notes around much more
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// efficient (saves gas) than calling these functions in series
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uint constant D64 = 0x10000000000000000;
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function mTransfer(uint64 idSender, uint[] notesAmounts, uint64 idReceiver) {
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for (uint i = 0; i < notesAmounts.length; i++ ) {
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uint64 idNote = uint64( notesAmounts[i] & (D64-1) );
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uint amount = notesAmounts[i] / D64;
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transfer(idSender, idNote, amount, idReceiver);
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}
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}
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function mWithdraw(uint[] notesAmounts) {
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for (uint i = 0; i < notesAmounts.length; i++ ) {
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uint64 idNote = uint64( notesAmounts[i] & (D64-1) );
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uint amount = notesAmounts[i] / D64;
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withdraw(idNote, amount);
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}
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}
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function mConfirmPayment(uint[] notesAmounts) {
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for (uint i = 0; i < notesAmounts.length; i++ ) {
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uint64 idNote = uint64( notesAmounts[i] & (D64-1) );
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uint amount = notesAmounts[i] / D64;
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confirmPayment(idNote, amount);
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}
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}
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function mCancelPayment(uint[] notesAmounts) {
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for (uint i = 0; i < notesAmounts.length; i++ ) {
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uint64 idNote = uint64( notesAmounts[i] & (D64-1) );
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uint amount = notesAmounts[i] / D64;
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cancelPayment(idNote, amount);
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}
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}
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function mNormalizeNote(uint[] notes) returns(uint64) {
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for (uint i = 0; i < notes.length; i++ ) {
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uint64 idNote = uint64( notes[i] & (D64-1) );
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normalizeNote(idNote);
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}
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}
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////////
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// Private methods
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///////
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// this function is obvious, but it can also be called to undelegate everyone
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// by setting yourself as the idReceiver
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function transferOwnershipToCampaign(uint64 idNote, uint amount, uint64 idReceiver) internal {
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Note storage n = findNote(idNote);
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require(getNoteLevel(n) < MAX_INTERCAMPAIGN_LEVEL);
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uint64 oldNote = findNote(
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n.owner,
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n.delegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.NotPaid);
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uint64 toNote = findNote(
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idReceiver,
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new uint64[](0),
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0,
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0,
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oldNote,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, amount);
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}
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function transferOwnershipToGiver(uint64 idNote, uint amount, uint64 idReceiver) internal {
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uint64 toNote = findNote(
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idReceiver,
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new uint64[](0),
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0,
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0,
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0,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, amount);
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}
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function appendDelegate(uint64 idNote, uint amount, uint64 idReceiver) internal {
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Note storage n= findNote(idNote);
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require(n.delegationChain.length < MAX_DELEGATES); //TODO change to revert and say the error
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uint64[] memory newDelegationChain = new uint64[](n.delegationChain.length + 1);
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for (uint i=0; i<n.delegationChain.length; i++) {
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newDelegationChain[i] = n.delegationChain[i];
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}
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// Make the last item in the array the idReceiver
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newDelegationChain[n.delegationChain.length] = idReceiver;
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uint64 toNote = findNote(
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n.owner,
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newDelegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, amount);
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}
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/// @param q Number of undelegations
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function undelegate(uint64 idNote, uint amount, uint q) internal {
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Note storage n = findNote(idNote);
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uint64[] memory newDelegationChain = new uint64[](n.delegationChain.length - q);
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for (uint i=0; i<n.delegationChain.length - q; i++) {
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newDelegationChain[i] = n.delegationChain[i];
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}
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uint64 toNote = findNote(
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n.owner,
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newDelegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, amount);
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}
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function proposeAssignCampaign(uint64 idNote, uint amount, uint64 idReceiver) internal {// Todo rename
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Note storage n = findNote(idNote);
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require(getNoteLevel(n) < MAX_SUBCAMPAIGN_LEVEL);
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uint64 toNote = findNote(
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n.owner,
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n.delegationChain,
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idReceiver,
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uint64(getTime() + maxCommitTime(n)),
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n.oldNote,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, amount);
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}
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function doTransfer(uint64 from, uint64 to, uint _amount) internal {
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uint amount = callPlugins(true, from, to, _amount);
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if (from == to) return;
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if (amount == 0) return;
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Note storage nFrom = findNote(from);
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Note storage nTo = findNote(to);
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require(nFrom.amount >= amount);
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nFrom.amount -= amount;
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nTo.amount += amount;
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Transfer(from, to, amount);
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callPlugins(false, from, to, amount);
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}
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// This function does 2 things, #1: it checks to make sure that the pledges are correct
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// if the a pledged campaign has already been committed then it changes the owner
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// to be the proposed campaign (Note that the UI will have to read the commit time and manually
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// do what this function does to the note for the end user at the expiration of the commitTime)
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// #2: It checks to make sure that if there has been a cancellation in the chain of campaigns,
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// then it adjusts the note's owner appropriately.
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// This call can be called from any body at any time on any node. In general it can be called
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// to force the calls of the affected plugins, which also need to be predicted by the UI
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function normalizeNote(uint64 idNote) returns(uint64) {
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Note storage n = findNote(idNote);
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// Check to make sure this note hasnt already been used or is in the process of being used
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if (n.paymentState != PaymentState.NotPaid) return idNote;
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// First send to a campaign if it's proposed and commited
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if ((n.proposedCampaign > 0) && ( getTime() > n.commitTime)) {
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uint64 oldNote = findNote(
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n.owner,
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n.delegationChain,
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0,
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0,
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n.oldNote,
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PaymentState.NotPaid);
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uint64 toNote = findNote(
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n.proposedCampaign,
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new uint64[](0),
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0,
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0,
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oldNote,
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PaymentState.NotPaid);
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doTransfer(idNote, toNote, n.amount);
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idNote = toNote;
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n = findNote(idNote);
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}
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toNote = getOldestNoteNotCanceled(idNote);// TODO toNote is note defined
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if (toNote != idNote) {
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doTransfer(idNote, toNote, n.amount);
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}
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return toNote;
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}
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/////////////
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// Plugins
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/////////////
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function callPlugin(bool before, uint64 managerId, uint64 fromNote, uint64 toNote, uint64 context, uint amount) internal returns (uint allowedAmount) {
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uint newAmount;
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allowedAmount = amount;
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NoteManager storage manager = findManager(managerId);
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if ((address(manager.plugin) != 0) && (allowedAmount > 0)) {
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if (before) {
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newAmount = manager.plugin.beforeTransfer(managerId, fromNote, toNote, context, amount);
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require(newAmount <= allowedAmount);
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allowedAmount = newAmount;
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} else {
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manager.plugin.afterTransfer(managerId, fromNote, toNote, context, amount);
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}
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}
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}
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function callPluginsNote(bool before, uint64 idNote, uint64 fromNote, uint64 toNote, uint amount) internal returns (uint allowedAmount) {
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uint64 offset = idNote == fromNote ? 0 : 256;
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allowedAmount = amount;
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Note storage n = findNote(idNote);
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allowedAmount = callPlugin(before, n.owner, fromNote, toNote, offset, allowedAmount);
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for (uint64 i=0; i<n.delegationChain.length; i++) {
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allowedAmount = callPlugin(before, n.delegationChain[i], fromNote, toNote, offset + i+1, allowedAmount);
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}
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if (n.proposedCampaign > 0) {
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allowedAmount = callPlugin(before, n.proposedCampaign, fromNote, toNote, offset + 255, allowedAmount);
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}
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}
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function callPlugins(bool before, uint64 fromNote, uint64 toNote, uint amount) internal returns (uint allowedAmount) {
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allowedAmount = amount;
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allowedAmount = callPluginsNote(before, fromNote, fromNote, toNote, allowedAmount);
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allowedAmount = callPluginsNote(before, toNote, fromNote, toNote, allowedAmount);
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}
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/////////////
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// Test functions
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/////////////
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function getTime() internal returns (uint) {
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return now;
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}
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event Transfer(uint64 indexed from, uint64 indexed to, uint amount);
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event CancelCampaign(uint64 indexed idCampaign);
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}
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