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

A Typescript implementation of the beacon chain

import { computeEpochAtSlot } from "@lodestar/state-transition";
import { toRootHex } from "@lodestar/utils";
export async function* onBeaconBlocksByRoot(requestBody, chain) {
    // The phase0 req/resp spec uses MIN_EPOCHS_FOR_BLOCK_REQUESTS to define the minimum range peers MUST serve.
    // Archival nodes may still serve older retained blocks to allow genesis sync.
    for (const blockRoot of requestBody) {
        const root = blockRoot;
        const block = await chain.getSerializedBlockByRoot(toRootHex(root));
        if (block) {
            yield {
                data: block.block,
                boundary: chain.config.getForkBoundaryAtEpoch(computeEpochAtSlot(block.slot)),
            };
        }
    }
}
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