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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include "kvcache.h"
#include <zencore/httpserver.h>
#include <zencore/memory.h>
#include <zencore/timer.h>
#include "cachestore.h"
#include "upstream/jupiter.h"
#include <spdlog/spdlog.h>
namespace zen {
using namespace fmt::literals;
using namespace std::literals;
//////////////////////////////////////////////////////////////////////////
struct HttpKvCacheService::AccessTracker
{
AccessTracker();
~AccessTracker();
void TrackAccess(std::string_view Key);
void Flush();
private:
RwLock m_Lock;
ChunkingLinearAllocator m_AccessRecordAllocator{8192};
};
HttpKvCacheService::AccessTracker::AccessTracker()
{
}
HttpKvCacheService::AccessTracker::~AccessTracker()
{
RwLock::ExclusiveLockScope _(m_Lock);
}
void
HttpKvCacheService::AccessTracker::Flush()
{
RwLock::ExclusiveLockScope _(m_Lock);
m_AccessRecordAllocator.Reset();
}
void
HttpKvCacheService::AccessTracker::TrackAccess(std::string_view Key)
{
// Once it matters, this should use a thread-local means of updating this data,
// like Concurrency::combinable or similar
RwLock::ExclusiveLockScope _(m_Lock);
const uint64_t KeySize = Key.size();
void* Ptr = m_AccessRecordAllocator.Alloc(KeySize + 1);
memcpy(Ptr, Key.data(), KeySize);
reinterpret_cast<uint8_t*>(Ptr)[KeySize] = 0;
}
//////////////////////////////////////////////////////////////////////////
HttpKvCacheService::HttpKvCacheService()
{
m_Cloud = new CloudCacheClient("https://jupiter.devtools.epicgames.com"sv,
"ue4.ddc"sv /* namespace */,
"test.ddc"sv /* blob store namespace */,
"https://epicgames.okta.com/oauth2/auso645ojjWVdRI3d0x7/v1/token"sv /* provider */,
"0oao91lrhqPiAlaGD0x7"sv /* client id */,
"-GBWjjenhCgOwhxL5yBKNJECVIoDPH0MK4RDuN7d"sv /* oauth secret */);
m_AccessTracker = std::make_unique<AccessTracker>();
}
HttpKvCacheService::~HttpKvCacheService()
{
}
const char*
HttpKvCacheService::BaseUri() const
{
return "/cache/";
}
void
HttpKvCacheService::HandleRequest(zen::HttpServerRequest& Request)
{
using namespace std::literals;
std::string_view Key = Request.RelativeUri();
switch (auto Verb = Request.RequestVerb())
{
using enum zen::HttpVerb;
case kHead:
case kGet:
{
m_AccessTracker->TrackAccess(Key);
CacheValue Value;
bool Success = m_cache.Get(Key, Value);
if (!Success)
{
Success = m_cache_.Get(Key, Value);
if (!Success)
{
CloudCacheSession Session(m_Cloud);
zen::Stopwatch Timer;
if (CloudCacheResult Result = Session.GetDerivedData("default", Key); Result.Success)
{
Success = true;
spdlog::debug("upstream HIT after {:5} {:6}! {}",
zen::NiceTimeSpanMs(Timer.getElapsedTimeMs()),
NiceBytes(Result.Value.Size()),
Key);
Value.Value = Result.Value;
}
else
{
spdlog::debug("upstream miss after {:5}! {}", zen::NiceTimeSpanMs(Timer.getElapsedTimeMs()), Key);
}
}
if (Success && (Value.Value.Size() <= m_InMemoryBlobSizeThreshold))
{
m_cache.Put(Key, Value);
}
}
if (!Success)
{
Request.WriteResponse(zen::HttpResponse::NotFound);
}
else
{
if (Verb == zen::HttpVerb::kHead)
{
Request.SetSuppressResponseBody();
Request.WriteResponse(zen::HttpResponse::OK, zen::HttpContentType::kBinary, Value.Value);
}
else
{
Request.WriteResponse(zen::HttpResponse::OK, zen::HttpContentType::kBinary, Value.Value);
}
}
}
break;
case kPut:
{
if (zen::IoBuffer Body = Request.ReadPayload())
{
CacheValue Value;
Value.Value = Body;
if (Value.Value.Size() <= m_InMemoryBlobSizeThreshold)
{
m_cache.Put(Key, Value);
}
// m_cache_.Put(Key, Value);
CloudCacheSession Session(m_Cloud);
zen::Stopwatch Timer;
CloudCacheResult Result = Session.PutDerivedData("default", Key, Value.Value);
spdlog::debug("upstream PUT '{}', took {:5} {:6}! {}",
Result.Success ? "OK" : "FAILED",
zen::NiceTimeSpanMs(Timer.getElapsedTimeMs()),
NiceBytes(Value.Value.Size()),
Key);
Request.WriteResponse(zen::HttpResponse::Created);
}
else
{
return;
}
}
break;
case kDelete:
// should this do anything?
return Request.WriteResponse(zen::HttpResponse::OK);
case kPost:
break;
default:
break;
}
}
void
HttpKvCacheService::Flush()
{
}
} // namespace zen
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