Function rest_blockhash_by_height

src/rest.cpp:883–931

}

static bool rest_blockhash_by_height(const std::any& context, HTTPRequest* req,
                       const std::string& str_uri_part)
{
    if (!CheckWarmup(req)) return false;
    std::string height_str;
    const RetFormat rf = ParseDataFormat(height_str, str_uri_part);

    int32_t blockheight = -1; // Initialization done only to prevent valgrind false positive, see https://github.com/bitcoin/bitcoin/pull/18785
    if (!ParseInt32(height_str, &blockheight) || blockheight < 0) {
        return RESTERR(req, HTTP_BAD_REQUEST, "Invalid height: " + SanitizeString(height_str));
    }

    CBlockIndex* pblockindex = nullptr;
    {
        ChainstateManager* maybe_chainman = GetChainman(context, req);
        if (!maybe_chainman) return false;
        ChainstateManager& chainman = *maybe_chainman;
        LOCK(cs_main);
        const CChain& active_chain = chainman.ActiveChain();
        if (blockheight > active_chain.Height()) {
            return RESTERR(req, HTTP_NOT_FOUND, "Block height out of range");
        }
        pblockindex = active_chain[blockheight];
    }
    switch (rf) {
    case RetFormat::BINARY: {
        CDataStream ss_blockhash(SER_NETWORK, PROTOCOL_VERSION);
        ss_blockhash << pblockindex->GetBlockHash();
        req->WriteHeader("Content-Type", "application/octet-stream");
        req->WriteReply(HTTP_OK, ss_blockhash.str());
        return true;
    }
    case RetFormat::HEX: {
        req->WriteHeader("Content-Type", "text/plain");
        req->WriteReply(HTTP_OK, pblockindex->GetBlockHash().GetHex() + "\n");
        return true;
    }
    case RetFormat::JSON: {
        req->WriteHeader("Content-Type", "application/json");
        UniValue resp = UniValue(UniValue::VOBJ);
        resp.pushKV("blockhash", pblockindex->GetBlockHash().GetHex());
        req->WriteReply(HTTP_OK, resp.write() + "\n");
        return true;
    }
    default: {
        return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: " + AvailableDataFormatsString() + ")");
    }
    }
}

static const struct {
    const char* prefix;