@lodestar/beacon-node/lib/network/reqresp/handlers/lightClientFinalityUpdate.js

A Typescript implementation of the beacon chain

import { RespStatus, ResponseError } from "@lodestar/reqresp";
import { computeEpochAtSlot } from "@lodestar/state-transition";
import { assertLightClientServer } from "../../../node/utils/lightclient.js";
import { ReqRespMethod, responseSszTypeByMethod } from "../types.js";
export async function* onLightClientFinalityUpdate(chain) {
    assertLightClientServer(chain.lightClientServer);
    const update = chain.lightClientServer.getFinalityUpdate();
    if (update === null) {
        throw new ResponseError(RespStatus.RESOURCE_UNAVAILABLE, "No latest finality update available");
    }
    const boundary = chain.config.getForkBoundaryAtEpoch(computeEpochAtSlot(update.signatureSlot));
    const type = responseSszTypeByMethod[ReqRespMethod.LightClientFinalityUpdate](boundary.fork, 0);
    yield {
        data: type.serialize(update),
        boundary,
    };
}
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