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@davidhq
Created February 22, 2022 14:30
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# Setup private variables (only callable from within the contract)
struct Funder :
sender: address
value: uint256
funders: HashMap[int128, Funder]
nextFunderIndex: int128
beneficiary: address
deadline: public(uint256)
goal: public(uint256)
refundIndex: int128
timelimit: public(uint256)
# Setup global variables
@external
def __init__(_beneficiary: address, _goal: uint256, _timelimit: uint256):
self.beneficiary = _beneficiary
self.deadline = block.timestamp + _timelimit
self.timelimit = _timelimit
self.goal = _goal
# Participate in this crowdfunding campaign
@external
@payable
def participate():
assert block.timestamp < self.deadline, "deadline not met (yet)"
nfi: int128 = self.nextFunderIndex
self.funders[nfi] = Funder({sender: msg.sender, value: msg.value})
self.nextFunderIndex = nfi + 1
# Enough money was raised! Send funds to the beneficiary
@external
def finalize():
assert block.timestamp >= self.deadline, "deadline has passed"
assert self.balance >= self.goal, "the goal has been reached"
selfdestruct(self.beneficiary)
# Not enough money was raised! Refund everyone (max 30 people at a time
# to avoid gas limit issues)
@external
def refund():
assert block.timestamp >= self.deadline and self.balance < self.goal
ind: int128 = self.refundIndex
for i in range(ind, ind + 30):
if i >= self.nextFunderIndex:
self.refundIndex = self.nextFunderIndex
return
send(self.funders[i].sender, self.funders[i].value)
self.funders[i] = empty(Funder)
self.refundIndex = ind + 30
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