Implement nextgen random handler and tests (#576)

Fixes #575

src/rpc/ngHandlers/Random.cpp

@@ -0,0 +1,48 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <rpc/RPCHelpers.h>
+#include <rpc/ngHandlers/Random.h>
+
+#include <ripple/beast/utility/rngfill.h>
+#include <ripple/crypto/csprng.h>
+
+namespace RPCng {
+
+RandomHandler::Result
+RandomHandler::process() const
+{
+    ripple::uint256 rand;
+    beast::rngfill(rand.begin(), rand.size(), ripple::crypto_prng());
+
+    return Output{ripple::strHex(rand)};
+}
+
+void
+tag_invoke(
+    boost::json::value_from_tag,
+    boost::json::value& jv,
+    RandomHandler::Output const& output)
+{
+    jv = {
+        {JS(random), output.random},
+    };
+}
+
+}  // namespace RPCng

src/rpc/ngHandlers/Random.h

@@ -0,0 +1,50 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#pragma once
+
+#include <rpc/common/Types.h>
+
+#include <boost/json/value.hpp>
+
+#include <string>
+
+namespace RPCng {
+
+class RandomHandler
+{
+public:
+    struct Output
+    {
+        std::string random;
+    };
+
+    using Result = HandlerReturnType<Output>;
+
+    Result
+    process() const;
+
+private:
+    friend void
+    tag_invoke(
+        boost::json::value_from_tag,
+        boost::json::value& jv,
+        Output const& output);
+};
+}  // namespace RPCng