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// Copyright Epic Games, Inc. All Rights Reserved.
#include "httphubservice.h"
#include "hub.h"
#include "storageserverinstance.h"
#include <zencore/compactbinarybuilder.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
namespace zen {
namespace {
bool HandleFailureResults(HttpServerRequest& Request, const Hub::Response& Resp)
{
if (Resp.ResponseCode == Hub::EResponseCode::Rejected)
{
if (Resp.Message.empty())
{
Request.WriteResponse(HttpResponseCode::Conflict);
}
else
{
Request.WriteResponse(HttpResponseCode::Conflict, HttpContentType::kText, Resp.Message);
}
return true;
}
if (Resp.ResponseCode == Hub::EResponseCode::NotFound)
{
if (Resp.Message.empty())
{
Request.WriteResponse(HttpResponseCode::NotFound);
}
else
{
Request.WriteResponse(HttpResponseCode::NotFound, HttpContentType::kText, Resp.Message);
}
return true;
}
return false;
}
} // namespace
HttpHubService::HttpHubService(Hub& Hub) : m_Hub(Hub)
{
using namespace std::literals;
m_Router.AddMatcher("moduleid", [](std::string_view Str) -> bool {
for (const auto C : Str)
{
if (std::isalnum(C) || C == '-')
{
// fine
}
else
{
// not fine
return false;
}
}
return true;
});
m_Router.RegisterRoute(
"status",
[this](HttpRouterRequest& Req) {
CbObjectWriter Obj;
Obj.BeginArray("modules");
m_Hub.EnumerateModules([&Obj](std::string_view ModuleId, const Hub::InstanceInfo& Info) {
Obj.BeginObject();
{
Obj << "moduleId" << ModuleId;
Obj << "state" << ToString(Info.State);
Obj << "port" << Info.Port;
Obj.BeginObject("process_metrics");
{
Obj << "MemoryBytes" << Info.Metrics.MemoryBytes;
Obj << "KernelTimeMs" << Info.Metrics.KernelTimeMs;
Obj << "UserTimeMs" << Info.Metrics.UserTimeMs;
Obj << "WorkingSetSize" << Info.Metrics.WorkingSetSize;
Obj << "PeakWorkingSetSize" << Info.Metrics.PeakWorkingSetSize;
Obj << "PagefileUsage" << Info.Metrics.PagefileUsage;
Obj << "PeakPagefileUsage" << Info.Metrics.PeakPagefileUsage;
}
Obj.EndObject();
}
Obj.EndObject();
});
Obj.EndArray();
Req.ServerRequest().WriteResponse(HttpResponseCode::OK, Obj.Save());
},
HttpVerb::kGet);
m_Router.RegisterRoute(
"modules/{moduleid}",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
if (Req.ServerRequest().RequestVerb() == HttpVerb::kDelete)
{
HandleModuleDelete(Req.ServerRequest(), ModuleId);
}
else
{
HandleModuleGet(Req.ServerRequest(), ModuleId);
}
},
HttpVerb::kGet | HttpVerb::kDelete);
m_Router.RegisterRoute(
"modules/{moduleid}/provision",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
try
{
HubProvisionedInstanceInfo Info;
Hub::Response Resp = m_Hub.Provision(ModuleId, Info);
if (HandleFailureResults(Req.ServerRequest(), Resp))
{
return;
}
const HttpResponseCode HttpCode =
(Resp.ResponseCode == Hub::EResponseCode::Accepted) ? HttpResponseCode::Accepted : HttpResponseCode::OK;
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
Obj << "baseUri" << Info.BaseUri;
Obj << "port" << Info.Port;
return Req.ServerRequest().WriteResponse(HttpCode, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while provisioning module '{}': {}", ModuleId, Ex.what());
throw;
}
},
HttpVerb::kPost);
m_Router.RegisterRoute(
"modules/{moduleid}/deprovision",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
try
{
Hub::Response Resp = m_Hub.Deprovision(std::string(ModuleId));
if (HandleFailureResults(Req.ServerRequest(), Resp))
{
return;
}
const HttpResponseCode HttpCode =
(Resp.ResponseCode == Hub::EResponseCode::Accepted) ? HttpResponseCode::Accepted : HttpResponseCode::OK;
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
return Req.ServerRequest().WriteResponse(HttpCode, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while deprovisioning module '{}': {}", ModuleId, Ex.what());
throw;
}
},
HttpVerb::kPost);
m_Router.RegisterRoute(
"modules/{moduleid}/hibernate",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
try
{
Hub::Response Resp = m_Hub.Hibernate(std::string(ModuleId));
if (HandleFailureResults(Req.ServerRequest(), Resp))
{
return;
}
const HttpResponseCode HttpCode =
(Resp.ResponseCode == Hub::EResponseCode::Accepted) ? HttpResponseCode::Accepted : HttpResponseCode::OK;
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
return Req.ServerRequest().WriteResponse(HttpCode, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while hibernating module '{}': {}", ModuleId, Ex.what());
throw;
}
},
HttpVerb::kPost);
m_Router.RegisterRoute(
"modules/{moduleid}/wake",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
try
{
Hub::Response Resp = m_Hub.Wake(std::string(ModuleId));
if (HandleFailureResults(Req.ServerRequest(), Resp))
{
return;
}
const HttpResponseCode HttpCode =
(Resp.ResponseCode == Hub::EResponseCode::Accepted) ? HttpResponseCode::Accepted : HttpResponseCode::OK;
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
return Req.ServerRequest().WriteResponse(HttpCode, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while waking module '{}': {}", ModuleId, Ex.what());
throw;
}
},
HttpVerb::kPost);
m_Router.RegisterRoute(
"stats",
[this](HttpRouterRequest& Req) {
CbObjectWriter Obj;
Obj << "currentInstanceCount" << m_Hub.GetInstanceCount();
Obj << "maxInstanceCount" << m_Hub.GetMaxInstanceCount();
Obj << "instanceLimit" << m_Hub.GetConfig().InstanceLimit;
Req.ServerRequest().WriteResponse(HttpResponseCode::OK, Obj.Save());
},
HttpVerb::kGet);
}
HttpHubService::~HttpHubService()
{
}
const char*
HttpHubService::BaseUri() const
{
return "/hub/";
}
void
HttpHubService::SetNotificationEndpoint(std::string_view UpstreamNotificationEndpoint, std::string_view InstanceId)
{
ZEN_UNUSED(UpstreamNotificationEndpoint, InstanceId);
// TODO: store these for use in notifications, on some interval/criteria which is currently TBD
}
void
HttpHubService::HandleRequest(zen::HttpServerRequest& Request)
{
m_Router.HandleRequest(Request);
}
void
HttpHubService::HandleModuleGet(HttpServerRequest& Request, std::string_view ModuleId)
{
Hub::InstanceInfo InstanceInfo;
if (!m_Hub.Find(ModuleId, &InstanceInfo))
{
Request.WriteResponse(HttpResponseCode::NotFound);
return;
}
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
Obj << "state" << ToString(InstanceInfo.State);
Request.WriteResponse(HttpResponseCode::OK, Obj.Save());
}
void
HttpHubService::HandleModuleDelete(HttpServerRequest& Request, std::string_view ModuleId)
{
Hub::InstanceInfo InstanceInfo;
if (!m_Hub.Find(ModuleId, &InstanceInfo))
{
Request.WriteResponse(HttpResponseCode::NotFound);
return;
}
if (InstanceInfo.State == HubInstanceState::Provisioned || InstanceInfo.State == HubInstanceState::Hibernated ||
InstanceInfo.State == HubInstanceState::Crashed)
{
try
{
Hub::Response Resp = m_Hub.Deprovision(std::string(ModuleId));
if (HandleFailureResults(Request, Resp))
{
return;
}
// TODO: nuke all related storage
const HttpResponseCode HttpCode =
(Resp.ResponseCode == Hub::EResponseCode::Accepted) ? HttpResponseCode::Accepted : HttpResponseCode::OK;
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
return Request.WriteResponse(HttpCode, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while deprovisioning module '{}': {}", ModuleId, Ex.what());
throw;
}
}
// TODO: nuke all related storage
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
Request.WriteResponse(HttpResponseCode::OK, Obj.Save());
}
} // namespace zen
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