redeem
params of yAssetParams -> (list(op), storage upd)
Redeem user collateral locked under yToken token of tokenId
, burning amount
of users yTokens.
The yToken
contract expects that underlying token info of tokenId
and all borrowed by user before tokenId
s are updated by calling PriceFeed.getPrice and updateInterest in the same block before this contract method
Types
type yAssetParams is [@layout:comb] record [
tokenId : nat; // yToken token Id
amount : nat; // amount tokens to burn
]
tokenId
nat
yToken identifier
amount
nat
amount of yTokens to burn
Usage
const redeemTokenId = 0; // or new BigNumber(0) or "0"
const amount = 10_000_000; // amount of yTokens to burn, pass 0 to burn all.
const yupana = await tezos.contract.at(yTokenAddress);
const proxy = await tezos.contract.at(proxyAddress);
const borrowedTokenIds = [1, 2]; // user borrowed tokens
const updBorrowed = borrowedTokenIds.reduce(
(batch, tokenId) => {
batch.push({
kind: "transaction",
...yupana.methods.updateInterest(tokenId).toTransferParams(),
},
{
kind: "transaction",
...proxy.methods.getPrice([tokenId]).toTransferParams(),
});
return batch;
}
const batchArray = [
...updBorrowed,
{
kind: "transaction",
...yupana.methods.updateInterest(redeemTokenId).toTransferParams(),
},
{
kind: "transaction",
...proxy.methods.getPrice([redeemTokenId]).toTransferParams(),
},
{
kind: "transaction",
...yupana.methods.redeem(redeemTokenId, amount).toTransferParams(),
},
];
const batch = await tezos.wallet.batch(batchArray);
const operation = await batch.send();
await operation.confirmation();
Errors
yToken/not-enough-tokens-to-burn
- not enough balance of tokens to burnburnAmount
wanted by user.underflow/totalSupplyF
- total supply less thanburnAmount
.underflow/totalLiquidF
- total liquidity less thanamount
.token/cant-get-contract-token
- FA12 token contract address does not containtransfer
entrypoint from FA12 interface.token/cant-get-contract-fa2-token
- FA2 token contract address does not containtransfer
entrypoint from FA2 interface.yToken/exceeds-allowable-redeem
- raised when outstanding borrow value greater than max collateral value.underflow/liquidity - reserves
- liquidity more than reserves.ceil-div-error
- division of two numbers fails.yToken/need-update
- token price and interest not updated (see warning above)yToken/yToken-undefined
- token identifier is not assigned to any known yTokens.
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