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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
// This class implements a custom SecondaryCache that randomly injects an
// error status into Inserts/Lookups based on a specified probability.
#include "utilities/fault_injection_secondary_cache.h"
namespace ROCKSDB_NAMESPACE {
void FaultInjectionSecondaryCache::ResultHandle::UpdateHandleValue(
FaultInjectionSecondaryCache::ResultHandle* handle) {
ErrorContext* ctx = handle->cache_->GetErrorContext();
if (!ctx->rand.OneIn(handle->cache_->prob_)) {
handle->value_ = handle->base_->Value();
handle->size_ = handle->base_->Size();
}
handle->base_.reset();
}
bool FaultInjectionSecondaryCache::ResultHandle::IsReady() {
bool ready = true;
if (base_) {
ready = base_->IsReady();
if (ready) {
UpdateHandleValue(this);
}
}
return ready;
}
void FaultInjectionSecondaryCache::ResultHandle::Wait() {
base_->Wait();
UpdateHandleValue(this);
}
void* FaultInjectionSecondaryCache::ResultHandle::Value() { return value_; }
size_t FaultInjectionSecondaryCache::ResultHandle::Size() { return size_; }
void FaultInjectionSecondaryCache::ResultHandle::WaitAll(
FaultInjectionSecondaryCache* cache,
std::vector<SecondaryCacheResultHandle*> handles) {
std::vector<SecondaryCacheResultHandle*> base_handles;
for (SecondaryCacheResultHandle* hdl : handles) {
FaultInjectionSecondaryCache::ResultHandle* handle =
static_cast<FaultInjectionSecondaryCache::ResultHandle*>(hdl);
if (!handle->base_) {
continue;
}
base_handles.emplace_back(handle->base_.get());
}
cache->base_->WaitAll(base_handles);
for (SecondaryCacheResultHandle* hdl : handles) {
FaultInjectionSecondaryCache::ResultHandle* handle =
static_cast<FaultInjectionSecondaryCache::ResultHandle*>(hdl);
if (handle->base_) {
UpdateHandleValue(handle);
}
}
}
FaultInjectionSecondaryCache::ErrorContext*
FaultInjectionSecondaryCache::GetErrorContext() {
ErrorContext* ctx = static_cast<ErrorContext*>(thread_local_error_->Get());
if (!ctx) {
ctx = new ErrorContext(seed_);
thread_local_error_->Reset(ctx);
}
return ctx;
}
Status FaultInjectionSecondaryCache::Insert(
const Slice& key, void* value, const Cache::CacheItemHelper* helper) {
ErrorContext* ctx = GetErrorContext();
if (ctx->rand.OneIn(prob_)) {
return Status::IOError();
}
return base_->Insert(key, value, helper);
}
std::unique_ptr<SecondaryCacheResultHandle>
FaultInjectionSecondaryCache::Lookup(const Slice& key,
const Cache::CreateCallback& create_cb,
bool wait, bool advise_erase,
bool& is_in_sec_cache) {
ErrorContext* ctx = GetErrorContext();
if (base_is_compressed_sec_cache_) {
if (ctx->rand.OneIn(prob_)) {
return nullptr;
} else {
return base_->Lookup(key, create_cb, wait, advise_erase, is_in_sec_cache);
}
} else {
std::unique_ptr<SecondaryCacheResultHandle> hdl =
base_->Lookup(key, create_cb, wait, advise_erase, is_in_sec_cache);
if (wait && ctx->rand.OneIn(prob_)) {
hdl.reset();
}
return std::unique_ptr<FaultInjectionSecondaryCache::ResultHandle>(
new FaultInjectionSecondaryCache::ResultHandle(this, std::move(hdl)));
}
}
void FaultInjectionSecondaryCache::Erase(const Slice& key) {
base_->Erase(key);
}
void FaultInjectionSecondaryCache::WaitAll(
std::vector<SecondaryCacheResultHandle*> handles) {
if (base_is_compressed_sec_cache_) {
ErrorContext* ctx = GetErrorContext();
std::vector<SecondaryCacheResultHandle*> base_handles;
for (SecondaryCacheResultHandle* hdl : handles) {
if (ctx->rand.OneIn(prob_)) {
continue;
}
base_handles.push_back(hdl);
}
base_->WaitAll(base_handles);
} else {
FaultInjectionSecondaryCache::ResultHandle::WaitAll(this, handles);
}
}
} // namespace ROCKSDB_NAMESPACE
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