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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 {
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](StorageServerInstance& Instance) {
Obj.BeginObject();
Obj << "moduleId" << Instance.GetModuleId();
Obj << "provisioned" << Instance.IsProvisioned();
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);
std::string FailureReason = "unknown";
HttpResponseCode ResponseCode = HttpResponseCode::OK;
try
{
HubProvisionedInstanceInfo Info;
if (m_Hub.Provision(ModuleId, /* out */ Info, /* out */ FailureReason))
{
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
Obj << "baseUri" << Info.BaseUri;
Obj << "port" << Info.Port;
Req.ServerRequest().WriteResponse(HttpResponseCode::OK, Obj.Save());
return;
}
else
{
ResponseCode = HttpResponseCode::BadRequest;
}
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while provisioning module '{}': {}", ModuleId, Ex.what());
FailureReason = Ex.what();
ResponseCode = HttpResponseCode::InternalServerError;
}
Req.ServerRequest().WriteResponse(ResponseCode, HttpContentType::kText, FailureReason);
},
HttpVerb::kPost);
m_Router.RegisterRoute(
"modules/{moduleid}/deprovision",
[this](HttpRouterRequest& Req) {
std::string_view ModuleId = Req.GetCapture(1);
std::string FailureReason = "unknown";
try
{
if (!m_Hub.Deprovision(std::string(ModuleId), /* out */ FailureReason))
{
if (FailureReason.empty())
{
return Req.ServerRequest().WriteResponse(HttpResponseCode::NotFound);
}
else
{
return Req.ServerRequest().WriteResponse(HttpResponseCode::BadRequest, HttpContentType::kText, FailureReason);
}
}
CbObjectWriter Obj;
Obj << "moduleId" << ModuleId;
return Req.ServerRequest().WriteResponse(HttpResponseCode::OK, Obj.Save());
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Exception while deprovisioning module '{}': {}", ModuleId, Ex.what());
FailureReason = Ex.what();
}
Req.ServerRequest().WriteResponse(HttpResponseCode::InternalServerError, HttpContentType::kText, FailureReason);
},
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)
{
StorageServerInstance* Instance = nullptr;
if (!m_Hub.Find(ModuleId, &Instance))
{
Request.WriteResponse(HttpResponseCode::NotFound);
return;
}
// TODO: A separate http request for the modules/{moduleid}/deprovision endpoint can be called and deprovision the instance leaving us
// with a dangling pointer...
CbObjectWriter Obj;
Obj << "moduleId" << Instance->GetModuleId();
Obj << "provisioned" << Instance->IsProvisioned();
Request.WriteResponse(HttpResponseCode::OK, Obj.Save());
}
void
HttpHubService::HandleModuleDelete(HttpServerRequest& Request, std::string_view ModuleId)
{
StorageServerInstance* Instance = nullptr;
if (!m_Hub.Find(ModuleId, &Instance))
{
Request.WriteResponse(HttpResponseCode::NotFound);
return;
}
// TODO: deprovision and nuke all related storage
CbObjectWriter Obj;
Obj << "moduleId" << Instance->GetModuleId();
Obj << "provisioned" << Instance->IsProvisioned();
Request.WriteResponse(HttpResponseCode::OK, Obj.Save());
}
} // namespace zen
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