Function echoipc

src/rpc/misc.cpp:743–779

static RPCHelpMan echojson() { return echo("echojson"); }

static RPCHelpMan echoipc()
{
    return RPCHelpMan{
        "echoipc",
        "\nEcho back the input argument, passing it through a spawned process in a multiprocess build.\n"
        "This command is for testing.\n",
        {{"arg", RPCArg::Type::STR, RPCArg::Optional::NO, "The string to echo",}},
        RPCResult{RPCResult::Type::STR, "echo", "The echoed string."},
        RPCExamples{HelpExampleCli("echo", "\"Hello world\"") +
                    HelpExampleRpc("echo", "\"Hello world\"")},
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue {
            interfaces::Init& local_init = *EnsureAnyNodeContext(request.context).init;
            std::unique_ptr<interfaces::Echo> echo;
            if (interfaces::Ipc* ipc = local_init.ipc()) {
                // Spawn a new bitcoin-node process and call makeEcho to get a
                // client pointer to a interfaces::Echo instance running in
                // that process. This is just for testing. A slightly more
                // realistic test spawning a different executable instead of
                // the same executable would add a new bitcoin-echo executable,
                // and spawn bitcoin-echo below instead of bitcoin-node. But
                // using bitcoin-node avoids the need to build and install a
                // new executable just for this one test.
                auto init = ipc->spawnProcess("bitcoin-node");
                echo = init->makeEcho();
                ipc->addCleanup(*echo, [init = init.release()] { delete init; });
            } else {
                // IPC support is not available because this is a bitcoind
                // process not a bitcoind-node process, so just create a local
                // interfaces::Echo object and return it so the `echoipc` RPC
                // method will work, and the python test calling `echoipc`
                // can expect the same result.
                echo = local_init.makeEcho();
            }
            return echo->echo(request.params[0].get_str());
        },
    };
}

static UniValue SummaryToJSON(const IndexSummary&& summary, std::string index_name)
{