Implement amm_info handler (#1060)

Fixes #283

src/rpc/AMMHelpers.cpp

@@ -0,0 +1,82 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2024, 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/AMMHelpers.h"
+
+#include "data/BackendInterface.h"
+#include "util/log/Logger.h"
+
+#include <ripple/protocol/AMMCore.h>
+
+namespace rpc {
+
+std::pair<ripple::STAmount, ripple::STAmount>
+getAmmPoolHolds(
+    BackendInterface const& backend,
+    std::uint32_t sequence,
+    ripple::AccountID const& ammAccountID,
+    ripple::Issue const& issue1,
+    ripple::Issue const& issue2,
+    bool freezeHandling,
+    boost::asio::yield_context yield
+)
+{
+    auto const assetInBalance =
+        accountHolds(backend, sequence, ammAccountID, issue1.currency, issue1.account, freezeHandling, yield);
+    auto const assetOutBalance =
+        accountHolds(backend, sequence, ammAccountID, issue2.currency, issue2.account, freezeHandling, yield);
+    return std::make_pair(assetInBalance, assetOutBalance);
+}
+
+ripple::STAmount
+getAmmLpHolds(
+    BackendInterface const& backend,
+    std::uint32_t sequence,
+    ripple::Currency const& cur1,
+    ripple::Currency const& cur2,
+    ripple::AccountID const& ammAccount,
+    ripple::AccountID const& lpAccount,
+    boost::asio::yield_context yield
+)
+{
+    auto const lptCurrency = ammLPTCurrency(cur1, cur2);
+    return accountHolds(backend, sequence, lpAccount, lptCurrency, ammAccount, true, yield);
+}
+
+ripple::STAmount
+getAmmLpHolds(
+    BackendInterface const& backend,
+    std::uint32_t sequence,
+    ripple::SLE const& ammSle,
+    ripple::AccountID const& lpAccount,
+    boost::asio::yield_context yield
+)
+{
+    return getAmmLpHolds(
+        backend,
+        sequence,
+        ammSle[ripple::sfAsset].currency,
+        ammSle[ripple::sfAsset2].currency,
+        ammSle[ripple::sfAccount],
+        lpAccount,
+        yield
+    );
+}
+
+}  // namespace rpc