d34da12240
A new stale_topology_exception was introduced, it's raised in apply_fence when an RPC comes with a stale fencing_token. An overload of apply_fence with future will be used to wrap the storage_proxy methods which need to be fenced.
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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* Copyright 2022-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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#pragma once
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#include <cstdint>
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#include <exception>
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#include <optional>
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#include <variant>
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#include <seastar/core/sstring.hh>
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#include <seastar/core/timed_out_error.hh>
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#include "utils/exception_container.hh"
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#include "utils/result.hh"
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namespace replica {
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// A marker indicating that the exception_variant holds an unknown exception.
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// For example, replica sends a new type of error and coordinator does not
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// understand it because it wasn't upgraded to a newer version yet.
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struct unknown_exception {};
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// A marker indicating that the exception variant doesn't hold any exception.
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struct no_exception {};
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class replica_exception : public std::exception {
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public:
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replica_exception() noexcept {};
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};
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class rate_limit_exception final : public replica_exception {
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public:
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rate_limit_exception() noexcept
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: replica_exception()
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{ }
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virtual const char* what() const noexcept override { return "rate limit exceeded"; }
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};
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class stale_topology_exception final : public replica_exception {
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int64_t _caller_version;
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int64_t _callee_fence_version;
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seastar::sstring _message;
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public:
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stale_topology_exception(int64_t caller_version, int64_t callee_fence_version)
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: _caller_version(caller_version)
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, _callee_fence_version(callee_fence_version)
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, _message(seastar::format("stale topology exception, caller version {}, callee fence version {}", caller_version, callee_fence_version))
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{
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}
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int64_t caller_version() const {
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return _caller_version;
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}
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int64_t callee_fence_version() const {
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return _callee_fence_version;
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}
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virtual const char* what() const noexcept override { return _message.c_str(); }
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};
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struct exception_variant {
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std::variant<unknown_exception,
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no_exception,
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rate_limit_exception,
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stale_topology_exception
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> reason;
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exception_variant()
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: reason(no_exception{})
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{ }
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template<typename Ex>
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exception_variant(Ex&& ex)
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: reason(std::move(ex))
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{ }
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std::exception_ptr into_exception_ptr() noexcept;
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inline operator bool() const noexcept {
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return !std::holds_alternative<no_exception>(reason);
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}
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};
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// Tries to encode the exception into an exception_variant.
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// If given exception cannot be encoded into one of the replica exception types,
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// returns no_exception.
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exception_variant try_encode_replica_exception(std::exception_ptr eptr);
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}
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