yann300
2 years ago
parent
254a72d745
commit
c0d736dc8e
@ -1,161 +0,0 @@ |
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export const Ballot = { |
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name: 'browser/ballot.vy', |
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content: `# Voting with delegation.
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# Information about voters |
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struct Voter: |
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# weight is accumulated by delegation |
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weight: int128 |
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# if true, that person already voted (which includes voting by delegating) |
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voted: bool |
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# person delegated to |
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delegate: address |
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# index of the voted proposal, which is not meaningful unless 'voted' is True. |
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vote: int128 |
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# Users can create proposals |
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struct Proposal: |
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# short name (up to 32 bytes) |
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name: bytes32 |
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# number of accumulated votes |
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voteCount: int128 |
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voters: public(map(address, Voter)) |
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proposals: public(map(int128, Proposal)) |
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voterCount: public(int128) |
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chairperson: public(address) |
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int128Proposals: public(int128) |
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@public |
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@constant |
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def delegated(addr: address) -> bool: |
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return self.voters[addr].delegate != ZERO_ADDRESS |
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@public |
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@constant |
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def directlyVoted(addr: address) -> bool: |
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return self.voters[addr].voted and (self.voters[addr].delegate == ZERO_ADDRESS) |
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# Setup global variables |
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@public |
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def __init__(_proposalNames: bytes32[2]): |
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self.chairperson = msg.sender |
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self.voterCount = 0 |
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for i in range(2): |
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self.proposals[i] = Proposal({ |
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name: _proposalNames[i], |
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voteCount: 0 |
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}) |
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self.int128Proposals += 1 |
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|
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# Give a 'voter' the right to vote on this ballot. |
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# This may only be called by the 'chairperson'. |
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@public |
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def giveRightToVote(voter: address): |
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# Throws if the sender is not the chairperson. |
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assert msg.sender == self.chairperson |
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# Throws if the voter has already voted. |
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assert not self.voters[voter].voted |
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# Throws if the voter's voting weight isn't 0. |
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assert self.voters[voter].weight == 0 |
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self.voters[voter].weight = 1 |
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self.voterCount += 1 |
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# Used by 'delegate' below, and can be called by anyone. |
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@public |
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def forwardWeight(delegate_with_weight_to_forward: address): |
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assert self.delegated(delegate_with_weight_to_forward) |
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# Throw if there is nothing to do: |
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assert self.voters[delegate_with_weight_to_forward].weight > 0 |
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target: address = self.voters[delegate_with_weight_to_forward].delegate |
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for i in range(4): |
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if self.delegated(target): |
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target = self.voters[target].delegate |
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# The following effectively detects cycles of length <= 5, |
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# in which the delegation is given back to the delegator. |
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# This could be done for any int128ber of loops, |
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# or even infinitely with a while loop. |
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# However, cycles aren't actually problematic for correctness; |
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# they just result in spoiled votes. |
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# So, in the production version, this should instead be |
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# the responsibility of the contract's client, and this |
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# check should be removed. |
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assert target != delegate_with_weight_to_forward |
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else: |
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# Weight will be moved to someone who directly voted or |
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# hasn't voted. |
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break |
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weight_to_forward: int128 = self.voters[delegate_with_weight_to_forward].weight |
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self.voters[delegate_with_weight_to_forward].weight = 0 |
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self.voters[target].weight += weight_to_forward |
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if self.directlyVoted(target): |
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self.proposals[self.voters[target].vote].voteCount += weight_to_forward |
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self.voters[target].weight = 0 |
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# To reiterate: if target is also a delegate, this function will need |
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# to be called again, similarly to as above. |
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# Delegate your vote to the voter 'to'. |
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@public |
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def delegate(to: address): |
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# Throws if the sender has already voted |
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assert not self.voters[msg.sender].voted |
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# Throws if the sender tries to delegate their vote to themselves or to |
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# the default address value of 0x0000000000000000000000000000000000000000 |
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# (the latter might not be problematic, but I don't want to think about it). |
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assert to != msg.sender |
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assert to != ZERO_ADDRESS |
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self.voters[msg.sender].voted = True |
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self.voters[msg.sender].delegate = to |
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# This call will throw if and only if this delegation would cause a loop |
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# of length <= 5 that ends up delegating back to the delegator. |
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self.forwardWeight(msg.sender) |
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# Give your vote (including votes delegated to you) |
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# to proposal 'proposals[proposal].name'. |
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@public |
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def vote(proposal: int128): |
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# can't vote twice |
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assert not self.voters[msg.sender].voted |
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# can only vote on legitimate proposals |
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assert proposal < self.int128Proposals |
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self.voters[msg.sender].vote = proposal |
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self.voters[msg.sender].voted = True |
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# transfer msg.sender's weight to proposal |
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self.proposals[proposal].voteCount += self.voters[msg.sender].weight |
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self.voters[msg.sender].weight = 0 |
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# Computes the winning proposal taking all |
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# previous votes into account. |
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@public |
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@constant |
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def winningProposal() -> int128: |
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winning_vote_count: int128 = 0 |
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winning_proposal: int128 = 0 |
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for i in range(2): |
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if self.proposals[i].voteCount > winning_vote_count: |
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winning_vote_count = self.proposals[i].voteCount |
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winning_proposal = i |
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return winning_proposal |
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# Calls winningProposal() function to get the index |
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# of the winner contained in the proposals array and then |
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# returns the name of the winner |
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@public |
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@constant |
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def winnerName() -> bytes32: |
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return self.proposals[self.winningProposal()].name |
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` |
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} |
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