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#include <Common/Exception.h>
#include <Common/FailPoint.h>
#include <boost/core/noncopyable.hpp>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <optional>
#include <unordered_map>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
};
#if FIU_ENABLE
static struct InitFiu
{
InitFiu()
{
fiu_init(0);
}
} init_fiu;
/// We should define different types of failpoints here. There are four types of them:
/// - ONCE: the failpoint will only be triggered once.
/// - REGULAR: the failpoint will always be triggered util disableFailPoint is called.
/// - PAUSAEBLE_ONCE: the failpoint will be blocked one time when pauseFailPoint is called, util disableFailPoint is called.
/// - PAUSAEBLE: the failpoint will be blocked every time when pauseFailPoint is called, util disableFailPoint is called.
#define APPLY_FOR_FAILPOINTS(ONCE, REGULAR, PAUSEABLE_ONCE, PAUSEABLE) \
ONCE(replicated_merge_tree_commit_zk_fail_after_op) \
ONCE(replicated_merge_tree_insert_quorum_fail_0) \
REGULAR(use_delayed_remote_source) \
REGULAR(dummy_failpoint) \
PAUSEABLE_ONCE(dummy_pausable_failpoint_once) \
PAUSEABLE(dummy_pausable_failpoint)
namespace FailPoints
{
#define M(NAME) extern const char(NAME)[] = #NAME "";
APPLY_FOR_FAILPOINTS(M, M, M, M)
#undef M
}
static std::unordered_map<String, std::shared_ptr<FailPointChannel>> fail_point_wait_channels;
static std::mutex mu;
class FailPointChannel : private boost::noncopyable
{
public:
explicit FailPointChannel(UInt64 timeout_)
: timeout_ms(timeout_)
{}
FailPointChannel()
: timeout_ms(0)
{}
void wait()
{
std::unique_lock lock(m);
if (timeout_ms == 0)
cv.wait(lock);
else
cv.wait_for(lock, std::chrono::milliseconds(timeout_ms));
}
void notifyAll()
{
std::unique_lock lock(m);
cv.notify_all();
}
private:
UInt64 timeout_ms;
std::mutex m;
std::condition_variable cv;
};
void FailPointInjection::enablePauseFailPoint(const String & fail_point_name, UInt64 time_ms)
{
#define SUB_M(NAME, flags) \
if (fail_point_name == FailPoints::NAME) \
{ \
/* FIU_ONETIME -- Only fail once; the point of failure will be automatically disabled afterwards.*/ \
fiu_enable(FailPoints::NAME, 1, nullptr, flags); \
std::lock_guard lock(mu); \
fail_point_wait_channels.try_emplace(FailPoints::NAME, std::make_shared<FailPointChannel>(time_ms)); \
return; \
}
#define ONCE(NAME)
#define REGULAR(NAME)
#define PAUSEABLE_ONCE(NAME) SUB_M(NAME, FIU_ONETIME)
#define PAUSEABLE(NAME) SUB_M(NAME, 0)
APPLY_FOR_FAILPOINTS(ONCE, REGULAR, PAUSEABLE_ONCE, PAUSEABLE)
#undef SUB_M
#undef ONCE
#undef REGULAR
#undef PAUSEABLE_ONCE
#undef PAUSEABLE
throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot find fail point {}", fail_point_name);
}
void FailPointInjection::pauseFailPoint(const String & fail_point_name)
{
fiu_do_on(fail_point_name.c_str(), FailPointInjection::wait(fail_point_name););
}
void FailPointInjection::enableFailPoint(const String & fail_point_name)
{
#if FIU_ENABLE
#define SUB_M(NAME, flags, pause) \
if (fail_point_name == FailPoints::NAME) \
{ \
/* FIU_ONETIME -- Only fail once; the point of failure will be automatically disabled afterwards.*/ \
fiu_enable(FailPoints::NAME, 1, nullptr, flags); \
if (pause) \
{ \
std::lock_guard lock(mu); \
fail_point_wait_channels.try_emplace(FailPoints::NAME, std::make_shared<FailPointChannel>()); \
} \
return; \
}
#define ONCE(NAME) SUB_M(NAME, FIU_ONETIME, 0)
#define REGULAR(NAME) SUB_M(NAME, 0, 0)
#define PAUSEABLE_ONCE(NAME) SUB_M(NAME, FIU_ONETIME, 1)
#define PAUSEABLE(NAME) SUB_M(NAME, 0, 1)
APPLY_FOR_FAILPOINTS(ONCE, REGULAR, PAUSEABLE_ONCE, PAUSEABLE)
#undef SUB_M
#undef ONCE
#undef REGULAR
#undef PAUSEABLE_ONCE
#undef PAUSEABLE
#endif
throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot find fail point {}", fail_point_name);
}
void FailPointInjection::disableFailPoint(const String & fail_point_name)
{
std::lock_guard lock(mu);
if (auto iter = fail_point_wait_channels.find(fail_point_name); iter != fail_point_wait_channels.end())
{
/// can not rely on deconstruction to do the notify_all things, because
/// if someone wait on this, the deconstruct will never be called.
iter->second->notifyAll();
fail_point_wait_channels.erase(iter);
}
fiu_disable(fail_point_name.c_str());
}
void FailPointInjection::wait(const String & fail_point_name)
{
std::unique_lock lock(mu);
if (auto iter = fail_point_wait_channels.find(fail_point_name); iter == fail_point_wait_channels.end())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Can not find channel for fail point {}", fail_point_name);
else
{
lock.unlock();
auto ptr = iter->second;
ptr->wait();
}
};
#else
void FailPointInjection::pauseFailPoint(const String & /*fail_point_name*/) {}
void FailPointInjection::enableFailPoint(const String & /*fail_point_name*/) {}
void FailPointInjection::enablePauseFailPoint(const String & /*fail_point_name*/, UInt64 /*time*/) {}
void FailPointInjection::disableFailPoint(const String & /*fail_point_name*/) {}
void FailPointInjection::wait(const String & /*fail_point_name*/) {}
#endif
}
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