288f9b2b15
This PR extends authentication with 2 mechanisms: - a new role_manager subclass, which allows managing users via LDAP server, - a new authenticator, which delegates plaintext authentication to a running saslauthd daemon. The features have been ported from the enterprise repository with their test.py tests and the documentation as part of changing license to source available. Fixes: scylladb/scylla-enterprise#5000 Fixes: scylladb/scylla-enterprise#5001 Closes scylladb/scylladb#22030
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
/*
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* Copyright (C) 2021 ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <functional>
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#include <seastar/core/shared_future.hh>
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#include <stdexcept>
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/// Invokes a factory to produce an object, but sequentially: only one fiber at a time may be executing the
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/// factory. Any other fiber requesting the object will wait for the existing factory invocation to finish, then
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/// copy the result.
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///
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/// TODO: Move to Seastar.
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template<typename T>
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class sequential_producer {
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public:
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using factory_t = std::function<seastar::future<T>()>;
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private:
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factory_t _factory;
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seastar::shared_future<T> _churning; ///< Resolves when the previous _factory call completes.
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public:
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sequential_producer(factory_t&& f) : _factory(std::move(f))
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{
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clear();
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}
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seastar::future<T> operator()() {
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if (_churning.available()) {
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_churning = _factory();
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}
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return _churning.get_future();
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}
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void clear() {
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_churning = seastar::make_exception_future<T>(
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std::logic_error("initial future used in sequential_producer"));
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}
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};
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