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Merge pull request #7900 from Agoric/6678-intrinsicAtomicTransfer
refactor: move atomicRearrange into Zcf
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| import { makeScalarMapStore } from '@agoric/vat-data'; | ||
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| import { assertRightsConserved } from './rightsConservation.js'; | ||
| import { addToAllocation, subtractFromAllocation } from './allocationMath.js'; | ||
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| const { Fail } = assert; | ||
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| /** @typedef {Array<AmountKeywordRecord>} TransactionList */ | ||
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| /** | ||
| * Convert from a list of transfer descriptions ([fromSeat, toSeat, fromAmount, | ||
| * toAmount], with many parts optional) to a list of resulting allocations for | ||
| * each of the seats mentioned. | ||
| * | ||
| * @param {Array<TransferPart>} transfers | ||
| * @returns {[ZCFSeat, AmountKeywordRecord][]} | ||
| */ | ||
| export const makeAllocationMap = transfers => { | ||
| /** @type {MapStore<ZCFSeat, [TransactionList, TransactionList]>} */ | ||
| const allocations = makeScalarMapStore(); | ||
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| const getAllocations = seat => { | ||
| if (allocations.has(seat)) { | ||
| return allocations.get(seat); | ||
| } | ||
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| /** @type {[TransactionList, TransactionList]} */ | ||
| const pair = [[], []]; | ||
| allocations.init(seat, pair); | ||
| return pair; | ||
| }; | ||
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| const decrementAllocation = (seat, decrement) => { | ||
| const [incr, decr] = getAllocations(seat); | ||
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| const newDecr = [...decr, decrement]; | ||
| allocations.set(seat, [incr, newDecr]); | ||
| }; | ||
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| const incrementAllocation = (seat, increment) => { | ||
| const [incr, decr] = getAllocations(seat); | ||
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| const newIncr = [...incr, increment]; | ||
| allocations.set(seat, [newIncr, decr]); | ||
| }; | ||
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| for (const [fromSeat, toSeat, fromAmounts, toAmounts] of transfers) { | ||
| if (fromSeat) { | ||
| if (!fromAmounts) { | ||
| throw Fail`Transfer from ${fromSeat} must say how much`; | ||
| } | ||
| decrementAllocation(fromSeat, fromAmounts); | ||
| if (toSeat) { | ||
| // Conserved transfer between seats | ||
| if (toAmounts) { | ||
| // distinct amounts, so we check conservation. | ||
| assertRightsConserved( | ||
| Object.values(fromAmounts), | ||
| Object.values(toAmounts), | ||
| ); | ||
| incrementAllocation(toSeat, toAmounts); | ||
| } else { | ||
| // fromAmounts will be used for toAmounts as well | ||
| incrementAllocation(toSeat, fromAmounts); | ||
| } | ||
| } else { | ||
| // Transfer only from fromSeat | ||
| !toAmounts || | ||
| Fail`Transfer without toSeat cannot have toAmounts ${toAmounts}`; | ||
| } | ||
| } else { | ||
| toSeat || Fail`Transfer must have at least one of fromSeat or toSeat`; | ||
| // Transfer only to toSeat | ||
| !fromAmounts || | ||
| Fail`Transfer without fromSeat cannot have fromAmounts ${fromAmounts}`; | ||
| toAmounts || Fail`Transfer to ${toSeat} must say how much`; | ||
| incrementAllocation(toSeat, toAmounts); | ||
| } | ||
| } | ||
|
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| /** @type {[ZCFSeat,AmountKeywordRecord][]} */ | ||
| const resultingAllocations = []; | ||
| for (const [seat, [incrList, decrList]] of allocations.entries()) { | ||
| let newAlloc = seat.getCurrentAllocation(); | ||
| for (const incr of incrList) { | ||
| newAlloc = addToAllocation(newAlloc, incr); | ||
| } | ||
| for (const decr of decrList) { | ||
| newAlloc = subtractFromAllocation(newAlloc, decr); | ||
| } | ||
| resultingAllocations.push([seat, newAlloc]); | ||
| } | ||
| return resultingAllocations; | ||
| }; |
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