eth-json-rpc-middleware
Version:
Ethereum-related json-rpc-engine middleware.
36 lines • 1.48 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createBlockRefRewriteMiddleware = void 0;
const json_rpc_engine_1 = require("json-rpc-engine");
const cache_1 = require("./utils/cache");
function createBlockRefRewriteMiddleware({ blockTracker, } = {}) {
if (!blockTracker) {
throw Error('BlockRefRewriteMiddleware - mandatory "blockTracker" option is missing.');
}
return json_rpc_engine_1.createAsyncMiddleware(async (req, _res, next) => {
var _a;
const blockRefIndex = cache_1.blockTagParamIndex(req);
// skip if method does not include blockRef
if (blockRefIndex === undefined) {
return next();
}
// skip if not "latest"
let blockRef = (_a = req.params) === null || _a === void 0 ? void 0 : _a[blockRefIndex];
// omitted blockRef implies "latest"
if (blockRef === undefined) {
blockRef = 'latest';
}
if (blockRef !== 'latest') {
return next();
}
// rewrite blockRef to block-tracker's block number
const latestBlockNumber = await blockTracker.getLatestBlock();
if (req.params) {
// eslint-disable-next-line require-atomic-updates
req.params[blockRefIndex] = latestBlockNumber;
}
return next();
});
}
exports.createBlockRefRewriteMiddleware = createBlockRefRewriteMiddleware;
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