424 lines
15 KiB
Solidity
424 lines
15 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 actualy also calls the constructor for the
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// `LiquidPledgingBase` contract
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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 notes. The
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/// token of value goes into the vault and then the amount in the Note
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/// relevant to this donor without delegates is increased.
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/// After that, a normal transfer is done to the idReceiver.
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/// @param idDonor Identifier of the donor thats donating.
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/// @param idReceiver To whom it's transfered. Can be the same donor, another
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/// donor, a delegate or a project
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function donate(uint64 idDonor, uint64 idReceiver) payable {// TODO change to `pledge()`
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NoteManager storage sender = findManager(idDonor);
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require(sender.managerType == NoteManagerType.Donor);
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require(sender.addr == msg.sender);
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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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idDonor,
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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(idDonor, idNote, amount, idReceiver);
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}
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/// @notice This is the main function to move value from one Note to the other
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/// @param idSender ID of the donor, delegate or project manager that is transfering
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/// the funds from Note to Note. This manager must have permisions 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 donor sending to a donor or
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/// a delegate, a delegate to another delegate or a project to precommit it to that project
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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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require(sender.addr == msg.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.Donor) {
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transferOwnershipToDonor(idNote, amount, idReceiver);
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} else if (receiver.managerType == NoteManagerType.Project) {
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transferOwnershipToProject(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 donor
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if (receiver.managerType == NoteManagerType.Donor) {
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// Only accept to change to the original donor 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 project, they undelegate all
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// the delegates after them in the chain and choose a project
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if (receiver.managerType == NoteManagerType.Project) {
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undelegate(idNote, amount, n.delegationChain.length - senderDIdx - 1);
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proposeAssignProject(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 donors to avoid committing the donation or by project manager to use
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/// the Ether.
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/// @param idNote Id of the note that wants to be withdrawed.
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/// @param amount Quantity of Ether that wants to be withdrawed.
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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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require(owner.addr == msg.sender);
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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 withdrawed.
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/// @param amount Quantity of Ether that wants to be withdrawed.
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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 project 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 cacnceled, never is assigned to a project.
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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 by the reviewer of a project to cancel this project.
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/// @param idProject Id of the projct that wants to be canceled.
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function cancelProject(uint64 idProject) {
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NoteManager storage project = findManager(idProject);
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require((project.reviewer == msg.sender) || (project.addr == msg.sender));
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project.canceled = true;
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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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////////
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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 your self as teh idReceiver
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function transferOwnershipToProject(uint64 idNote, uint amount, uint64 idReceiver) internal {
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Note storage n = findNote(idNote);
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require(getProjectLevel(n) < MAX_SUBPROJECT_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 transferOwnershipToDonor(uint64 idNote, uint amount, uint64 idReceiver) internal {
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Note storage n = findNote(idNote);
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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 Unmber 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 proposeAssignProject(uint64 idNote, uint amount, uint64 idReceiver) internal {// Todo rename
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Note storage n = findNote(idNote);
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require(getProjectLevel(n) < MAX_SUBPROJECT_LEVEL);
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NoteManager storage owner = findManager(n.owner);
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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() + owner.commitTime),
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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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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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}
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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 project has already been commited then it changes the owner
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// to be the proposed project (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 projects,
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// then it adjusts the note's owner appropriately.
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function normalizeNote(uint64 idNote) internal 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 project if it's proposed and commited
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if ((n.proposedProject > 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.proposedProject,
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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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// 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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}
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