88 lines
3.1 KiB
JavaScript
88 lines
3.1 KiB
JavaScript
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"use strict";
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/** Blockscout ERC-20 transfer parsing (shared by aggregator + indexer). */
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.pickPrimaryTokenTransfer = pickPrimaryTokenTransfer;
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exports.parseAllTokenTransfers = parseAllTokenTransfers;
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exports.fetchTokenTransferItemsForTx = fetchTokenTransferItemsForTx;
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exports.pickPrimaryFromSummaries = pickPrimaryFromSummaries;
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exports.applyPrimaryTransferToLeaf = applyPrimaryTransferToLeaf;
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exports.fetchAllTokenTransfersForTx = fetchAllTokenTransfersForTx;
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exports.fetchPrimaryTokenTransferForTx = fetchPrimaryTokenTransferForTx;
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function parseItem(item) {
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const token = item.token?.address;
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const raw = item.total?.value ??
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(item.value != null && item.value !== '' ? item.value : undefined);
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if (!token || raw === undefined)
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return null;
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const value = BigInt(raw);
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if (value === 0n)
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return null;
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const decimals = parseInt(item.token?.decimals || item.total?.decimals || '18', 10);
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return {
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token,
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tokenSymbol: item.token?.symbol || '',
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tokenDecimals: Number.isFinite(decimals) ? decimals : 18,
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from: item.from?.hash || '',
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to: item.to?.hash || '',
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value,
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logIndex: item.log_index ?? 0,
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};
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}
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/** Largest ERC-20 transfer in a tx (legacy primary payment). */
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function pickPrimaryTokenTransfer(items) {
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let best = null;
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for (const item of items) {
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const summary = parseItem(item);
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if (!summary)
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continue;
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if (!best || summary.value > best.value)
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best = summary;
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}
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return best;
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}
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/** All non-zero ERC-20 transfers in a tx. */
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function parseAllTokenTransfers(items) {
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const out = [];
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for (const item of items) {
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const summary = parseItem(item);
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if (summary)
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out.push(summary);
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}
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return out.sort((a, b) => (a.logIndex < b.logIndex ? -1 : a.logIndex > b.logIndex ? 1 : 0));
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}
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async function fetchTokenTransferItemsForTx(apiBase, txHash) {
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const base = apiBase.replace(/\/$/, '');
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const res = await fetch(`${base}/transactions/${txHash}/token-transfers`);
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if (!res.ok)
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return [];
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const body = (await res.json());
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return body.items ?? [];
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}
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function pickPrimaryFromSummaries(items) {
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let best = null;
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for (const s of items) {
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if (!best || s.value > best.value)
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best = s;
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}
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return best;
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}
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function applyPrimaryTransferToLeaf(leaf, primary) {
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if (!primary)
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return;
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leaf.token = primary.token;
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leaf.tokenSymbol = primary.tokenSymbol;
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leaf.tokenDecimals = primary.tokenDecimals;
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leaf.tokenValue = primary.value.toString();
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leaf.tokenLogIndex = primary.logIndex;
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if (leaf.nativeValueWei == null)
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leaf.nativeValueWei = String(leaf.value ?? '0');
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}
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async function fetchAllTokenTransfersForTx(apiBase, txHash) {
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const items = await fetchTokenTransferItemsForTx(apiBase, txHash);
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return parseAllTokenTransfers(items);
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}
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async function fetchPrimaryTokenTransferForTx(apiBase, txHash) {
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const items = await fetchTokenTransferItemsForTx(apiBase, txHash);
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return pickPrimaryTokenTransfer(items);
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}
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