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// Copyright Epic Games, Inc. All Rights Reserved.
#include "httpsessions.h"
#include <zencore/compactbinarybuilder.h>
#include <zencore/compactbinaryvalidation.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
#include <zencore/trace.h>
#include "sessions.h"
namespace zen {
using namespace std::literals;
HttpSessionsService::HttpSessionsService(HttpStatusService& StatusService, HttpStatsService& StatsService, SessionsService& Sessions)
: m_Log(logging::Get("sessions"))
, m_StatusService(StatusService)
, m_StatsService(StatsService)
, m_Sessions(Sessions)
{
Initialize();
}
HttpSessionsService::~HttpSessionsService()
{
m_StatsService.UnregisterHandler("sessions", *this);
m_StatusService.UnregisterHandler("sessions", *this);
}
const char*
HttpSessionsService::BaseUri() const
{
return "/sessions/";
}
void
HttpSessionsService::HandleRequest(HttpServerRequest& Request)
{
metrics::OperationTiming::Scope $(m_HttpRequests);
if (m_Router.HandleRequest(Request) == false)
{
ZEN_WARN("No route found for {0}", Request.RelativeUri());
return Request.WriteResponse(HttpResponseCode::NotFound, HttpContentType::kText, "Not found"sv);
}
}
CbObject
HttpSessionsService::CollectStats()
{
ZEN_TRACE_CPU("SessionsService::Stats");
CbObjectWriter Cbo;
EmitSnapshot("requests", m_HttpRequests, Cbo);
Cbo.BeginObject("sessions");
{
Cbo << "readcount" << m_SessionsStats.SessionReadCount;
Cbo << "writecount" << m_SessionsStats.SessionWriteCount;
Cbo << "deletecount" << m_SessionsStats.SessionDeleteCount;
Cbo << "listcount" << m_SessionsStats.SessionListCount;
Cbo << "requestcount" << m_SessionsStats.RequestCount;
Cbo << "badrequestcount" << m_SessionsStats.BadRequestCount;
Cbo << "count" << m_Sessions.GetSessionCount();
}
Cbo.EndObject();
return Cbo.Save();
}
void
HttpSessionsService::HandleStatsRequest(HttpServerRequest& HttpReq)
{
HttpReq.WriteResponse(HttpResponseCode::OK, CollectStats());
}
void
HttpSessionsService::HandleStatusRequest(HttpServerRequest& Request)
{
ZEN_TRACE_CPU("HttpSessionsService::Status");
CbObjectWriter Cbo;
Cbo << "ok" << true;
Request.WriteResponse(HttpResponseCode::OK, Cbo.Save());
}
void
HttpSessionsService::Initialize()
{
using namespace std::literals;
ZEN_INFO("Initializing Sessions Service");
static constexpr AsciiSet ValidHexCharactersSet{"0123456789abcdefABCDEF"};
m_Router.AddMatcher("session_id", [](std::string_view Str) -> bool {
return Str.length() == Oid::StringLength && AsciiSet::HasOnly(Str, ValidHexCharactersSet);
});
m_Router.RegisterRoute(
"list",
[this](HttpRouterRequest& Req) { ListSessionsRequest(Req); },
HttpVerb::kGet);
m_Router.RegisterRoute(
"{session_id}",
[this](HttpRouterRequest& Req) { SessionRequest(Req); },
HttpVerb::kGet | HttpVerb::kPost | HttpVerb::kPut | HttpVerb::kDelete);
m_Router.RegisterRoute(
"",
[this](HttpRouterRequest& Req) { ListSessionsRequest(Req); },
HttpVerb::kGet);
m_StatsService.RegisterHandler("sessions", *this);
m_StatusService.RegisterHandler("sessions", *this);
}
static void
WriteSessionInfo(CbWriter& Writer, const SessionsService::SessionInfo& Info)
{
Writer << "id" << Info.Id;
if (!Info.AppName.empty())
{
Writer << "appname" << Info.AppName;
}
if (Info.JobId != Oid::Zero)
{
Writer << "jobid" << Info.JobId;
}
Writer << "created_at" << Info.CreatedAt;
Writer << "updated_at" << Info.UpdatedAt;
if (Info.Metadata.GetSize() > 0)
{
Writer.BeginObject("metadata");
for (const CbField& Field : Info.Metadata)
{
Writer.AddField(Field);
}
Writer.EndObject();
}
}
void
HttpSessionsService::ListSessionsRequest(HttpRouterRequest& Req)
{
HttpServerRequest& ServerRequest = Req.ServerRequest();
m_SessionsStats.SessionListCount++;
m_SessionsStats.RequestCount++;
std::vector<Ref<SessionsService::Session>> Sessions = m_Sessions.GetSessions();
CbObjectWriter Response;
Response.BeginArray("sessions");
for (const Ref<SessionsService::Session>& Session : Sessions)
{
Response.BeginObject();
{
WriteSessionInfo(Response, Session->Info());
}
Response.EndObject();
}
Response.EndArray();
return ServerRequest.WriteResponse(HttpResponseCode::OK, Response.Save());
}
void
HttpSessionsService::SessionRequest(HttpRouterRequest& Req)
{
HttpServerRequest& ServerRequest = Req.ServerRequest();
const Oid SessionId = Oid::TryFromHexString(Req.GetCapture(1));
if (SessionId == Oid::Zero)
{
m_SessionsStats.BadRequestCount++;
return ServerRequest.WriteResponse(HttpResponseCode::BadRequest,
HttpContentType::kText,
fmt::format("Invalid session id '{}'", Req.GetCapture(1)));
}
m_SessionsStats.RequestCount++;
switch (ServerRequest.RequestVerb())
{
case HttpVerb::kPost:
case HttpVerb::kPut:
{
IoBuffer Payload = ServerRequest.ReadPayload();
CbObject RequestObject;
if (Payload.GetSize() > 0)
{
if (CbValidateError ValidationResult = ValidateCompactBinary(Payload.GetView(), CbValidateMode::All);
ValidationResult != CbValidateError::None)
{
m_SessionsStats.BadRequestCount++;
return ServerRequest.WriteResponse(HttpResponseCode::BadRequest,
HttpContentType::kText,
fmt::format("Invalid payload: {}", zen::ToString(ValidationResult)));
}
RequestObject = LoadCompactBinaryObject(Payload);
}
if (ServerRequest.RequestVerb() == HttpVerb::kPost)
{
std::string AppName(RequestObject["appname"sv].AsString());
Oid JobId = RequestObject["jobid"sv].AsObjectId();
CbObjectView MetadataView = RequestObject["metadata"sv].AsObjectView();
m_SessionsStats.SessionWriteCount++;
if (m_Sessions.RegisterSession(SessionId, std::move(AppName), JobId, MetadataView))
{
return ServerRequest.WriteResponse(HttpResponseCode::Created, HttpContentType::kText, fmt::format("{}", SessionId));
}
else
{
// Already exists - try update instead
if (m_Sessions.UpdateSession(SessionId, MetadataView))
{
return ServerRequest.WriteResponse(HttpResponseCode::OK, HttpContentType::kText, fmt::format("{}", SessionId));
}
return ServerRequest.WriteResponse(HttpResponseCode::InternalServerError);
}
}
else
{
// PUT - update only
m_SessionsStats.SessionWriteCount++;
if (m_Sessions.UpdateSession(SessionId, RequestObject["metadata"sv].AsObjectView()))
{
return ServerRequest.WriteResponse(HttpResponseCode::OK, HttpContentType::kText, fmt::format("{}", SessionId));
}
return ServerRequest.WriteResponse(HttpResponseCode::NotFound,
HttpContentType::kText,
fmt::format("Session '{}' not found", SessionId));
}
}
case HttpVerb::kGet:
{
m_SessionsStats.SessionReadCount++;
Ref<SessionsService::Session> Session = m_Sessions.GetSession(SessionId);
if (Session)
{
CbObjectWriter Response;
WriteSessionInfo(Response, Session->Info());
return ServerRequest.WriteResponse(HttpResponseCode::OK, Response.Save());
}
return ServerRequest.WriteResponse(HttpResponseCode::NotFound);
}
case HttpVerb::kDelete:
{
m_SessionsStats.SessionDeleteCount++;
if (m_Sessions.RemoveSession(SessionId))
{
return ServerRequest.WriteResponse(HttpResponseCode::OK);
}
return ServerRequest.WriteResponse(HttpResponseCode::NotFound);
}
}
}
} // namespace zen
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