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index.ts
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index.ts
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import { tritsToTrytes, trytesToTrits } from '@iota/converter'
import { transactionHash } from '@iota/transaction'
import { asTransactionObject, asTransactionTrytes } from '@iota/transaction-converter'
import { NativeModules } from 'react-native'
import { Hash, Trytes } from '../../types'
/**
* Attaches transactions to tangle by finding a valid nonce.
* Proof-of-Work puzzle is solved with native modules that use
* [`entangled`](https://github.com/iotaledger/entangled/tree/develop/mobile) libraries.
*
* @method attachToTangle
*
* @param {Hash} trunkTransaction
*
* @param {Hash} branchTransaction
*
* @param {number} minWeightMagnitude
*
* @param {Trytes} trytes
*
* @return {Promise<Trytes[]>} Attached trytes
*/
export const attachToTangle = (
trunkTransaction: Hash,
branchTransaction: Hash,
minWeightMagnitude: number,
trytes: ReadonlyArray<Trytes>
): ReadonlyArray<Trytes> => {
const search = (transactions: ReadonlyArray<Trytes> = [], trunk = trunkTransaction) => {
if (transactions.length === trytes.length) {
return [...transactions].reverse()
}
const transaction = {
...asTransactionObject(trytes[transactions.length]),
trunkTransaction: trunk,
branchTransaction,
attachmentTimestamp: Date.now(),
attachmentTimestampLowerBound: 0,
attachmentTimestampUpperBound: (Math.pow(3, 27) - 1) / 2,
}
return NativeModules.PearlDiver.doPOW(asTransactionTrytes(transaction), minWeightMagnitude).then(
(nonce: Trytes) => {
const transactionTrytes = asTransactionTrytes({ ...transaction, nonce })
return search(
[...transactions, transactionTrytes],
tritsToTrytes(transactionHash(trytesToTrits(transactionTrytes)))
)
}
)
}
return search()
}