restriction_predicate.hpp

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/*
 * Copyright (c) 2019 Contributors.
 *
 * The MIT License
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#pragma once

#include <graphene/protocol/restriction.hpp>
#include <graphene/protocol/operations.hpp>

#include <functional>

namespace graphene { namespace protocol {

struct predicate_result {
   bool success = false;

   enum rejection_reason {
      predicate_was_false,
      null_optional,
      incorrect_variant_type
   };

   using rejection_indicator = static_variant<size_t, vector<predicate_result>, rejection_reason>;
   vector<rejection_indicator> rejection_path;

   static predicate_result Rejection(rejection_reason reason) { return {false, {reason}}; }
   static predicate_result Rejection(vector<predicate_result> branches) { return {false, {std::move(branches)}}; }
   static predicate_result Success() { return {true, {}}; }

   operator bool() const { return success; }

   predicate_result& reverse_path();
};

using restriction_predicate_function = std::function<predicate_result(const operation&)>;

restriction_predicate_function get_restriction_predicate(vector<restriction> rs, operation::tag_type op_type);

} } // namespace graphene::protocol

FC_REFLECT_ENUM(graphene::protocol::predicate_result::rejection_reason,
                (predicate_was_false)(null_optional)(incorrect_variant_type))
FC_REFLECT_TYPENAME(graphene::protocol::predicate_result::rejection_indicator)
FC_REFLECT(graphene::protocol::predicate_result, (success)(rejection_path))