3e0aacc8b5
Spans are more flexible and can be constructed from any contiguous container (such as small_vector), or a subrange of such a container. This can save allocations, so change the signature to accept a span. Spans cannot be constructed from std::initializer_list, so one such call site is changed to use construct a span directly from the single argument.
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include "user_function.hh"
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#include "cql3/util.hh"
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#include "log.hh"
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#include "lang/wasm.hh"
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#include <seastar/core/thread.hh>
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namespace cql3 {
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namespace functions {
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extern logging::logger log;
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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, context ctx)
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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), _ctx(std::move(ctx)) {}
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bool user_function::is_pure() const { return true; }
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bool user_function::is_native() const { return false; }
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bool user_function::is_aggregate() const { return false; }
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bool user_function::requires_thread() const { return true; }
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bytes_opt user_function::execute(std::span<const 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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if (!seastar::thread::running_in_thread()) {
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on_internal_error(log, "User function cannot be executed in this context");
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}
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for (auto& param : parameters) {
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if (!param && !_called_on_null_input) {
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return std::nullopt;
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}
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}
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return seastar::visit(_ctx,
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[&] (lua_context& ctx) -> bytes_opt {
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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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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{ctx.bitcode}, values, return_type(), ctx.cfg).get0();
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},
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[&] (wasm::context& ctx) -> bytes_opt {
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try {
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return wasm::run_script(name(), ctx, arg_types(), parameters, return_type(), _called_on_null_input).get0();
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} catch (const wasm::exception& e) {
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throw exceptions::invalid_request_exception(format("UDF error: {}", e.what()));
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}
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});
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}
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std::ostream& user_function::describe(std::ostream& os) const {
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auto ks = cql3::util::maybe_quote(name().keyspace);
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auto na = cql3::util::maybe_quote(name().name);
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os << "CREATE FUNCTION " << ks << "." << na << "(";
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for (size_t i = 0; i < _arg_names.size(); i++) {
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if (i > 0) {
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os << ", ";
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}
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os << _arg_names[i] << " " << _arg_types[i]->cql3_type_name();
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}
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os << ")\n";
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if (_called_on_null_input) {
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os << "CALLED";
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} else {
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os << "RETURNS NULL";
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}
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os << " ON NULL INPUT\n"
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<< "RETURNS " << _return_type->cql3_type_name() << "\n"
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<< "LANGUAGE " << _language << "\n"
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<< "AS $$\n"
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<< _body << "\n"
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<< "$$;";
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return os;
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}
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}
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}
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