ee1d87a600
This add a wrapper around the lua interpreter so that function executions are interruptible and return futures. With this patch it is possible to write and use simple UDFs that take and return integer values. Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*
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* Copyright (C) 2019 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "user_function.hh"
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#include "lua.hh"
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namespace cql3 {
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namespace functions {
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user_function::user_function(function_name name, std::vector<data_type> arg_types, std::vector<sstring> arg_names,
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sstring body, sstring language, data_type return_type, bool called_on_null_input, sstring bitcode,
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lua::runtime_config cfg)
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: abstract_function(std::move(name), std::move(arg_types), std::move(return_type)),
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_arg_names(std::move(arg_names)), _body(std::move(body)), _language(std::move(language)),
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_called_on_null_input(called_on_null_input), _bitcode(std::move(bitcode)),
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_cfg(std::move(cfg)) {}
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bool user_function::is_pure() { return true; }
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bool user_function::is_native() { return false; }
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bool user_function::is_aggregate() { return false; }
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bool user_function::requires_thread() const { return true; }
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bytes_opt user_function::execute(cql_serialization_format sf, const std::vector<bytes_opt>& parameters) {
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const auto& types = arg_types();
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if (parameters.size() != types.size()) {
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throw std::logic_error("Wrong number of parameters");
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}
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std::vector<data_value> values;
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values.reserve(parameters.size());
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for (int i = 0, n = types.size(); i != n; ++i) {
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const data_type& type = types[i];
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const bytes_opt& bytes = parameters[i];
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if (!bytes && !_called_on_null_input) {
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return std::nullopt;
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}
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values.push_back(bytes ? type->deserialize(*bytes) : data_value::make_null(type));
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}
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return lua::run_script(lua::bitcode_view{_bitcode}, values, return_type(), _cfg).get0();
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}
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}
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}
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