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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/iobuffer.h>
#include <zencore/iohash.h>
#include <zencore/zencore.h>
#include <atomic>
#include <chrono>
#include <memory>
namespace zen {
class CbObjectWriter;
class CidStore;
class ZenCacheStore;
struct CloudCacheClientOptions;
struct UpstreamCacheKey
{
std::string Bucket;
IoHash Hash;
};
struct UpstreamPayloadKey
{
UpstreamCacheKey CacheKey;
IoHash PayloadId;
};
struct UpstreamCacheRecord
{
ZenContentType Type = ZenContentType::kBinary;
UpstreamCacheKey CacheKey;
std::vector<IoHash> PayloadIds;
};
struct UpstreamCacheOptions
{
std::chrono::seconds HealthCheckInterval{5};
uint32_t ThreadCount = 4;
bool ReadUpstream = true;
bool WriteUpstream = true;
bool StatsEnabled = false;
};
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 UpstreamEndpointHealth
{
std::string Reason;
bool Ok = false;
};
struct UpstreamEndpointStats
{
std::atomic_uint64_t HitCount{};
std::atomic_uint64_t MissCount{};
std::atomic_uint64_t UpCount{};
std::atomic_uint64_t ErrorCount{};
std::atomic<double> UpBytes{};
std::atomic<double> DownBytes{};
std::atomic<double> SecondsUp{};
std::atomic<double> SecondsDown{};
};
/**
* The upstream endpont is responsible for handling upload/downloading of cache records.
*/
class UpstreamEndpoint
{
public:
virtual ~UpstreamEndpoint() = default;
virtual UpstreamEndpointHealth Initialize() = 0;
virtual bool IsHealthy() const = 0;
virtual UpstreamEndpointHealth CheckHealth() = 0;
virtual std::string_view DisplayName() const = 0;
virtual GetUpstreamCacheResult GetCacheRecord(UpstreamCacheKey CacheKey, ZenContentType Type) = 0;
virtual GetUpstreamCacheResult GetCachePayload(UpstreamPayloadKey PayloadKey) = 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 bool Initialize() = 0;
virtual void RegisterEndpoint(std::unique_ptr<UpstreamEndpoint> Endpoint) = 0;
virtual GetUpstreamCacheResult GetCacheRecord(UpstreamCacheKey CacheKey, ZenContentType Type) = 0;
virtual GetUpstreamCacheResult GetCachePayload(UpstreamPayloadKey PayloadKey) = 0;
struct EnqueueResult
{
bool Success = false;
};
virtual EnqueueResult 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);
std::unique_ptr<UpstreamEndpoint> MakeZenUpstreamEndpoint(std::span<std::string const> Urls);
} // namespace zen
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