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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/iobuffer.h>
#include <zencore/iohash.h>
#include <zencore/stats.h>
#include <zencore/zencore.h>
#include <zenutil/cache/cache.h>
#include <atomic>
#include <chrono>
#include <functional>
#include <memory>
namespace zen {
class AuthMgr;
class CbObjectView;
class CbPackage;
class CbObjectWriter;
class CidStore;
class ZenCacheStore;
struct CloudCacheClientOptions;
struct ZenStructuredCacheClientOptions;
struct UpstreamCacheRecord
{
ZenContentType Type = ZenContentType::kBinary;
CacheKey Key;
std::vector<IoHash> ValueContentIds;
};
struct UpstreamCacheOptions
{
std::chrono::seconds HealthCheckInterval{5};
uint32_t ThreadCount = 4;
bool ReadUpstream = true;
bool WriteUpstream = true;
};
struct UpstreamError
{
int32_t ErrorCode{};
std::string Reason{};
explicit operator bool() const { return ErrorCode != 0; }
};
struct GetUpstreamCacheResult
{
IoBuffer Value;
UpstreamError Error{};
int64_t Bytes{};
double ElapsedSeconds{};
bool Success = false;
};
struct PutUpstreamCacheResult
{
std::string Reason;
int64_t Bytes{};
double ElapsedSeconds{};
bool Success = false;
};
struct CacheRecordGetCompleteParams
{
const CacheKey& Key;
size_t KeyIndex = ~size_t(0);
const CbObjectView& Record;
const CbPackage& Package;
};
using OnCacheRecordGetComplete = std::function<void(CacheRecordGetCompleteParams&&)>;
struct CacheValueGetCompleteParams
{
const CacheChunkRequest& Request;
size_t RequestIndex{~size_t(0)};
IoBuffer Value;
};
using OnCacheValueGetComplete = std::function<void(CacheValueGetCompleteParams&&)>;
struct UpstreamEndpointStats
{
metrics::OperationTiming CacheGetRequestTiming;
metrics::OperationTiming CachePutRequestTiming;
metrics::Counter CacheGetTotalBytes;
metrics::Counter CachePutTotalBytes;
metrics::Counter CacheGetCount;
metrics::Counter CacheHitCount;
metrics::Counter CacheErrorCount;
};
enum class UpstreamEndpointState : uint32_t
{
kDisabled,
kUnauthorized,
kError,
kOk
};
inline std::string_view
ToString(UpstreamEndpointState State)
{
using namespace std::literals;
switch (State)
{
case UpstreamEndpointState::kDisabled:
return "Disabled"sv;
case UpstreamEndpointState::kUnauthorized:
return "Unauthorized"sv;
case UpstreamEndpointState::kError:
return "Error"sv;
case UpstreamEndpointState::kOk:
return "Ok"sv;
default:
return "Unknown"sv;
}
}
struct UpstreamEndpointStatus
{
std::string Reason;
UpstreamEndpointState State;
};
struct UpstreamEndpointInfo
{
std::string Name;
std::string Url;
};
/**
* The upstream endpont is responsible for handling upload/downloading of cache records.
*/
class UpstreamEndpoint
{
public:
virtual ~UpstreamEndpoint() = default;
virtual const UpstreamEndpointInfo& GetEndpointInfo() const = 0;
virtual UpstreamEndpointStatus Initialize() = 0;
virtual UpstreamEndpointState GetState() = 0;
virtual UpstreamEndpointStatus GetStatus() = 0;
virtual GetUpstreamCacheResult GetCacheRecord(CacheKey CacheKey, ZenContentType Type) = 0;
virtual GetUpstreamCacheResult GetCacheRecords(std::span<CacheKey> CacheKeys,
std::span<size_t> KeyIndex,
const CacheRecordPolicy& Policy,
OnCacheRecordGetComplete&& OnComplete) = 0;
virtual GetUpstreamCacheResult GetCacheValue(const CacheKey& CacheKey, const IoHash& PayloadId) = 0;
virtual GetUpstreamCacheResult GetCacheValues(std::span<CacheChunkRequest> CacheChunkRequests,
std::span<size_t> RequestIndex,
OnCacheValueGetComplete&& OnComplete) = 0;
virtual PutUpstreamCacheResult PutCacheRecord(const UpstreamCacheRecord& CacheRecord,
IoBuffer RecordValue,
std::span<IoBuffer const> Payloads) = 0;
virtual UpstreamEndpointStats& Stats() = 0;
};
/**
* Manages one or more upstream cache endpoints.
*/
class UpstreamCache
{
public:
virtual ~UpstreamCache() = default;
virtual void Initialize() = 0;
virtual void RegisterEndpoint(std::unique_ptr<UpstreamEndpoint> Endpoint) = 0;
virtual void IterateEndpoints(std::function<bool(UpstreamEndpoint&)>&& Fn) = 0;
virtual GetUpstreamCacheResult GetCacheRecord(CacheKey CacheKey, ZenContentType Type) = 0;
virtual void GetCacheRecords(std::span<CacheKey> CacheKeys,
std::span<size_t> KeyIndex,
const CacheRecordPolicy& RecordPolicy,
OnCacheRecordGetComplete&& OnComplete) = 0;
virtual GetUpstreamCacheResult GetCacheValue(const CacheKey& CacheKey, const IoHash& ValueContentId) = 0;
virtual void GetCacheValues(std::span<CacheChunkRequest> CacheChunkRequests,
std::span<size_t> RequestIndex,
OnCacheValueGetComplete&& OnComplete) = 0;
virtual void EnqueueUpstream(UpstreamCacheRecord CacheRecord) = 0;
virtual void GetStatus(CbObjectWriter& CbO) = 0;
};
std::unique_ptr<UpstreamCache> MakeUpstreamCache(const UpstreamCacheOptions& Options, ZenCacheStore& CacheStore, CidStore& CidStore);
std::unique_ptr<UpstreamEndpoint> MakeJupiterUpstreamEndpoint(const CloudCacheClientOptions& Options, AuthMgr& Mgr);
std::unique_ptr<UpstreamEndpoint> MakeZenUpstreamEndpoint(const ZenStructuredCacheClientOptions& Options);
} // namespace zen
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