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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include <memory>
#include <optional>
#include <type_traits>
#include <boost/intrusive_ptr.hpp>
#include <boost/smart_ptr/intrusive_ref_counter.hpp>
#include <boost/smart_ptr/local_shared_ptr.hpp>
#include <seastar/core/chunked_fifo.hh>
#include <seastar/core/future.hh>
#include <seastar/core/shared_future.hh>
#include "common/dout.h"
#include "crimson/net/Fwd.h"
#include "os/Transaction.h"
#include "osd/osd_types.h"
#include "osd/osd_internal_types.h"
#include "crimson/common/type_helpers.h"
#include "crimson/osd/osd_operations/client_request.h"
#include "crimson/osd/osd_operations/peering_event.h"
#include "crimson/osd/shard_services.h"
#include "crimson/osd/osdmap_gate.h"
#include "crimson/osd/pg.h"
#include "crimson/osd/pg_backend.h"
#include "crimson/osd/exceptions.h"
#include "messages/MOSDOp.h"
class PGLSFilter;
class OSDOp;
namespace ceph::osd {
class OpsExecuter {
// an operation can be divided into two stages: main and effect-exposing
// one. The former is performed immediately on call to `do_osd_op()` while
// the later on `submit_changes()` – after successfully processing main
// stages of all involved operations. When any stage fails, none of all
// scheduled effect-exposing stages will be executed.
// when operation requires this division, `with_effect()` should be used.
struct effect_t {
virtual seastar::future<> execute() = 0;
virtual ~effect_t() = default;
};
PGBackend::cached_os_t os;
PG& pg;
PGBackend& backend;
Ref<MOSDOp> msg;
ceph::os::Transaction txn;
size_t num_read = 0; ///< count read ops
size_t num_write = 0; ///< count update ops
// this gizmo could be wrapped in std::optional for the sake of lazy
// initialization. we don't need it for ops that doesn't have effect
// TODO: verify the init overhead of chunked_fifo
seastar::chunked_fifo<std::unique_ptr<effect_t>> op_effects;
template <class Context, class MainFunc, class EffectFunc>
auto with_effect(Context&& ctx, MainFunc&& main_func, EffectFunc&& effect_func);
seastar::future<> do_op_call(class OSDOp& osd_op);
template <class Func>
auto do_const_op(Func&& f) {
// TODO: pass backend as read-only
return std::forward<Func>(f)(backend, std::as_const(*os));
}
template <class Func>
auto do_read_op(Func&& f) {
++num_read;
// TODO: pass backend as read-only
return do_const_op(std::forward<Func>(f));
}
template <class Func>
auto do_write_op(Func&& f) {
++num_write;
return std::forward<Func>(f)(backend, *os, txn);
}
// PG operations are being provided with pg instead of os.
template <class Func>
auto do_pg_op(Func&& f) {
return std::forward<Func>(f)(std::as_const(pg),
std::as_const(msg->get_hobj().nspace));
}
seastar::future<> dont_do_legacy_op() {
throw ceph::osd::operation_not_supported();
}
public:
OpsExecuter(PGBackend::cached_os_t os, PG& pg, Ref<MOSDOp> msg)
: os(std::move(os)),
pg(pg),
backend(pg.get_backend()),
msg(std::move(msg)) {
}
OpsExecuter(PG& pg, Ref<MOSDOp> msg)
: OpsExecuter{PGBackend::cached_os_t{}, pg, std::move(msg)}
{}
seastar::future<> execute_osd_op(class OSDOp& osd_op);
seastar::future<> execute_pg_op(class OSDOp& osd_op);
template <typename Func>
seastar::future<> submit_changes(Func&& f) &&;
const auto& get_message() const {
return *msg;
}
};
template <class Context, class MainFunc, class EffectFunc>
auto OpsExecuter::with_effect(
Context&& ctx,
MainFunc&& main_func,
EffectFunc&& effect_func)
{
using context_t = std::decay_t<Context>;
// the language offers implicit conversion to pointer-to-function for
// lambda only when it's closureless
static_assert(std::is_convertible_v<EffectFunc,
seastar::future<> (*)(context_t&&)>,
"with_effect function is not allowed to capture");
struct task_t final : effect_t {
context_t ctx;
EffectFunc effect_func;
task_t(Context&& ctx, EffectFunc&& effect_func)
: ctx(std::move(ctx)), effect_func(std::move(effect_func)) {}
seastar::future<> execute() final {
return std::move(effect_func)(std::move(ctx));
}
};
auto task =
std::make_unique<task_t>(std::move(ctx), std::move(effect_func));
auto& ctx_ref = task->ctx;
op_effects.emplace_back(std::move(task));
return std::forward<MainFunc>(main_func)(ctx_ref);
}
template <typename Func>
seastar::future<> OpsExecuter::submit_changes(Func&& f) && {
return std::forward<Func>(f)(std::move(txn), std::move(os)).then(
// NOTE: this lambda could be scheduled conditionally (if_then?)
[this] {
return seastar::do_until(
[this] { return op_effects.empty(); },
[this] {
auto fut = op_effects.front()->execute();
op_effects.pop_front();
return fut;
});
});
}
} // namespace ceph::osd
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