TokenSwap

The intent of this contract is to facilitate the automated process of a variable rate claimable token swap.

What is a "variable rate claimable token swap"? The variable rate simply refers to the fact that the rate at which tokens are swapped are converted is set to a dynamic configurable amount. The claimable part means that the swapper is able to make a claim against their allocated balance to upstream supported contracts.

There are 12 internal state variables, i'll explain each one below:

• creator This is the address of the person who created the contract instance. They have the ability to prematurely end the token swap and also initiate final token transfer once token swap is successful

• beneficiary The address which will receive the raised ETH. It can only be set at the time of contract creation and cannot be changed.

• upstream_claim_address The upstream contract that can process participant claims, must contain the Claim() function as shown in the interface contract.

• amountRaisedInWei Internal accounting variable that keeps track of how much has been raised.

• rewardTokensIssued Internal accounting variable that keeps track of how many reward tokens been issued.

• tokenSwapClosed Flag to track status of tokenswap.

• fundingGoalInWei How much ETH constitutes a successful token swap

• fundingCapInWei How much ETH should we stop the token swap

• standardRewardRate The pre-calculated standard amount reward tokens issued for every 1 ETH. Its basically just funding Cap / RewardTokens to be issued

• startDate Set this to when you want the token swap to begin

• endDate Automatically set to whatever enddate you want

• trancheSize Pre-calculated amount of tokens to issue before checking for the next variable price adjustment.

• particpants Mapping of particpants addresses and these details

  • weiReceived (track how much particpant has swapped)
  • claimTokens (how much the user can claim)
  • claimed (has user claimed or not)

TokenSwap statuses

In progress

Users can call Swap() to execute their swaps. Contract creator can also issue a CloseTokenSwap() at anytime to cancel the process.

Cancelled

Users can call WithdrawWei() to withdraw all ETH they have sent if the token swap is cancelled or does not meet target

Target not met

As above, users can call WithdrawWei() to get their ETH back

Success

Users can call Claim() to make their claim to the upstream contract if the token swap is successful

Also on success the token swap creator can issue a call to TransitionAllTokens() to send all Ether raised to the beneficiary address.