@ledgerhq/coin-hedera/lib/logic/lastBlock.js

Ledger Hedera Coin integration

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.lastBlock = lastBlock;
const constants_1 = require("../constants");
const api_1 = require("../network/api");
const utils_1 = require("./utils");
/**
 * Gets the latest "block" information for Hedera.
 *
 * Hedera doesn't have actual blocks - it uses a timestamp-based consensus model.
 * To make Hedera compatible with block-based architecture:
 * 1. We fetch the most recent transaction from the mirror node
 * 2. Extract its consensus timestamp
 * 3. Convert this timestamp into a synthetic block using a hardcoded time window (10 seconds by default)
 */
async function lastBlock() {
    // see getBlock implementation, block data should be immutable: we do not allow querying blocks on non-finalized time range.
    // => we search the most recent transaction, but only in finalized time range (ending 10 seconds ago).
    const before = new Date(Date.now() - constants_1.FINALITY_MS - constants_1.SYNTHETIC_BLOCK_WINDOW_SECONDS * 1000);
    const latestTransaction = await api_1.apiClient.getLatestTransaction(before);
    const syntheticBlock = (0, utils_1.getSyntheticBlock)(latestTransaction.consensus_timestamp);
    return {
        height: syntheticBlock.blockHeight,
        hash: syntheticBlock.blockHash,
        time: syntheticBlock.blockTime,
    };
}
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