95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "rocksdb/secondary_cache.h"
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#include "util/random.h"
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#include "util/thread_local.h"
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namespace ROCKSDB_NAMESPACE {
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// This class implements a custom SecondaryCache that randomly injects an
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// error status into Inserts/Lookups based on a specified probability.
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// Its used by db_stress to verify correctness in the presence of
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// secondary cache errors.
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//
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class FaultInjectionSecondaryCache : public SecondaryCache {
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public:
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explicit FaultInjectionSecondaryCache(
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const std::shared_ptr<SecondaryCache>& base, uint32_t seed, int prob)
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: base_(base),
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seed_(seed),
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prob_(prob),
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thread_local_error_(new ThreadLocalPtr(DeleteThreadLocalErrorContext)) {
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}
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virtual ~FaultInjectionSecondaryCache() override {}
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const char* Name() const override { return "FaultInjectionSecondaryCache"; }
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Status Insert(const Slice& key, void* value,
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const Cache::CacheItemHelper* helper) override;
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std::unique_ptr<SecondaryCacheResultHandle> Lookup(
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const Slice& key, const Cache::CreateCallback& create_cb,
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bool wait) override;
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void Erase(const Slice& /*key*/) override;
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void WaitAll(std::vector<SecondaryCacheResultHandle*> handles) override;
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std::string GetPrintableOptions() const override { return ""; }
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void EnableErrorInjection(uint64_t prob);
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private:
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class ResultHandle : public SecondaryCacheResultHandle {
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public:
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ResultHandle(FaultInjectionSecondaryCache* cache,
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std::unique_ptr<SecondaryCacheResultHandle>&& base)
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: cache_(cache), base_(std::move(base)), value_(nullptr), size_(0) {}
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~ResultHandle() override {}
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bool IsReady() override;
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void Wait() override;
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void* Value() override;
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size_t Size() override;
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static void WaitAll(FaultInjectionSecondaryCache* cache,
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std::vector<SecondaryCacheResultHandle*> handles);
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private:
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static void UpdateHandleValue(ResultHandle* handle);
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FaultInjectionSecondaryCache* cache_;
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std::unique_ptr<SecondaryCacheResultHandle> base_;
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void* value_;
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size_t size_;
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};
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static void DeleteThreadLocalErrorContext(void* p) {
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ErrorContext* ctx = static_cast<ErrorContext*>(p);
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delete ctx;
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}
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const std::shared_ptr<SecondaryCache> base_;
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uint32_t seed_;
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int prob_;
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struct ErrorContext {
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Random rand;
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explicit ErrorContext(uint32_t seed) : rand(seed) {}
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};
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std::unique_ptr<ThreadLocalPtr> thread_local_error_;
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ErrorContext* GetErrorContext();
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};
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} // namespace ROCKSDB_NAMESPACE
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