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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | 4x 4x 4x 11x 9x 2x 1x 1x 1x 4x 11x 11x 11x 6x 6x 6x 6x 5x 5x 11x 11x 11x | const { Tx, Type, Util } = require('leap-core');
const { EMPTY_ADDRESS } = require('../../../utils/constants');
const txValue = (tx, prevTx) => {
// assuming first output is transfer, second one is change
if (tx.outputs && tx.outputs.length > 0) {
return {
value: tx.outputs[0].value,
color: tx.outputs[0].color,
};
}
if (tx.type === Type.EXIT && prevTx) {
const output = prevTx.outputs[tx.inputs[0].prevout.index];
return {
value: output.value,
color: output.color,
};
}
return { value: 0, color: 0 };
};
module.exports = async (db, tx) => {
let prevTx = null;
let from = EMPTY_ADDRESS;
if (tx.inputs && tx.inputs.length > 0 && tx.inputs[0].prevout) {
const prevTxHash = tx.inputs[0].prevout.hash;
const outputIndex = tx.inputs[0].prevout.index;
const txDoc = await db.getTransaction(Util.toHexString(prevTxHash));
if (txDoc) {
prevTx = Tx.fromJSON(txDoc.txData);
from = prevTx.outputs[outputIndex].address;
}
}
const { value, color } = txValue(tx, prevTx);
const to = tx.outputs && tx.outputs.length ? tx.outputs[0].address : EMPTY_ADDRESS;
return {
value,
color,
from,
to
};
};
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