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+// Copyright (c) 2018-2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <type_traits>
+
+namespace
+{
+ // credits to yrp (https://stackoverflow.com/questions/87372/check-if-a-class-has-a-member-function-of-a-given-signature
+ template <typename T>
+ struct HasCredits
+ {
+ template<typename U, uint64_t (U::*)> struct SFINAE {};
+ template<typename U> static char Test(SFINAE<U, &U::credits>*);
+ template<typename U> static int Test(...);
+ static const bool Has = sizeof(Test<T>(0)) == sizeof(char);
+ };
+}
+
+namespace tools
+{
+ struct rpc_payment_state_t
+ {
+ uint64_t credits;
+ uint64_t expected_spent;
+ uint64_t discrepancy;
+ std::string top_hash;
+ bool stale;
+
+ rpc_payment_state_t(): credits(0), expected_spent(0), discrepancy(0), stale(true) {}
+ };
+
+ static inline void check_rpc_cost(rpc_payment_state_t &rpc_payment_state, const char *call, uint64_t post_call_credits, uint64_t pre_call_credits, double expected_cost)
+ {
+ uint64_t expected_credits = (uint64_t)expected_cost;
+ if (expected_credits == 0)
+ expected_credits = 1;
+
+ rpc_payment_state.credits = post_call_credits;
+ rpc_payment_state.expected_spent += expected_credits;
+
+ if (pre_call_credits < post_call_credits)
+ return;
+
+ uint64_t cost = pre_call_credits - post_call_credits;
+
+ if (cost == expected_credits)
+ {
+ MDEBUG("Call " << call << " cost " << cost << " credits");
+ return;
+ }
+ MWARNING("Call " << call << " cost " << cost << " credits, expected " << expected_credits);
+
+ if (cost > expected_credits)
+ {
+ uint64_t d = cost - expected_credits;
+ if (rpc_payment_state.discrepancy > std::numeric_limits<uint64_t>::max() - d)
+ {
+ MERROR("Integer overflow in credit discrepancy calculation, setting to max");
+ rpc_payment_state.discrepancy = std::numeric_limits<uint64_t>::max();
+ }
+ else
+ {
+ rpc_payment_state.discrepancy += d;
+ }
+ }
+ }
+}