1  import { E } from '@endo/eventual-send';
 2  import { AmountMath } from '@agoric/ertp';
 3  
 4  import {
 5    offerTo,
 6    swapExact
 7  } from '@agoric/zoe/src/contractSupport/zoeHelpers.js';
 8  import { getGive, getWant } from '../../../shared/helpers.js';
 9  import { atomicRearrange } from '@agoric/zoe/src/contractSupport/index.js';
10  
11  const giveCollateralToLender = async (
12    zcf,
13    { collateralSeat, lenderSeat, debtObject, debtBrand, collateralObject }
14  ) =>
15    await atomicRearrange(
16      zcf,
17      harden([
18        // Transfer the wanted Loan amount to the borrower
19        [
20          collateralSeat,
21          lenderSeat,
22          {
23            [`${collateralObject.keyword}`]: collateralSeat.getAmountAllocated(
24              collateralObject.keyword
25            )
26          }
27        ],
28        // Transfer *all* collateral to the collateral seat.
29        [
30          lenderSeat,
31          collateralSeat,
32          {
33            [`${debtObject.keyword}`]: AmountMath.makeEmpty(debtBrand)
34          }
35        ]
36      ])
37    );
38  
39  const closeSuccessfully = (zcf, lenderSeat, collateralSeat) => () => {
40    lenderSeat.exit();
41    collateralSeat.exit();
42    zcf.shutdown('your loan had to be liquidated');
43  };
44  
45  const closeWithFailure = (zcf, lenderSeat, collateralSeat) => err => {
46    lenderSeat.fail(err);
47    collateralSeat.fail(err);
48    zcf.shutdownWithFailure(err);
49    throw err;
50  };
51  
52  /**
53   * This function is triggered by the priceAuthority when the value of the
54   * collateral is below the maxLtv. The function performs the
55   * liquidation and then shuts down the contract. Note that if a
56   * liquidation occurs, the borrower gets nothing and they can take no
57   * further action.
58   *
59   * For simplicity, we will sell all collateral.
60   *
61   * @type {Liquidate}
62   */
63  const liquidate = async (zcf, loanState) => {
64    await giveCollateralToLender(zcf, loanState).then(
65      closeSuccessfully(zcf, loanState.lenderSeat, loanState.collateralSeat),
66      closeWithFailure(zcf, loanState.lenderSeat, loanState.collateralSeat)
67    );
68  };
69  harden(liquidate);
70  
71  export { liquidate };