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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "managed_rpc_server.h"
#include "i_rpc_server_manager.h"
#include "random.h"
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/frt/target.h>
#include <vespa/log/log.h>
LOG_SETUP(".slobrok.server.managed_rpc_server");
namespace slobrok {
//-----------------------------------------------------------------------------
ManagedRpcServer::ManagedRpcServer(const std::string & name,
const std::string & spec,
IRpcServerManager &manager)
: NamedService(name, spec),
FNET_Task(manager.getSupervisor()->GetScheduler()),
_mmanager(manager),
_monitor(*this, *manager.getSupervisor()),
_monitoredServer(nullptr),
_checkServerReq(nullptr)
{
double seconds = randomIn(2.5, 2.9);
LOG(debug, "first healthcheck for %s in %g seconds", name.c_str(), seconds);
Schedule(seconds);
}
void ManagedRpcServer::PerformTask() {
if (_monitoredServer == nullptr) {
_monitoredServer = _mmanager.getSupervisor()->GetTarget(_spec.c_str());
}
if (_checkServerReq == nullptr) {
_checkServerReq = _mmanager.getSupervisor()->AllocRPCRequest();
_checkServerReq->SetMethodName("slobrok.callback.listNamesServed");
_monitoredServer->InvokeAsync(_checkServerReq, 5.0, this);
}
double seconds = randomIn(2.5, 2.9);
LOG(debug, "next healthcheck for %s in %g seconds", getName().c_str(), seconds);
Schedule(seconds);
}
void ManagedRpcServer::healthCheck() {
ScheduleNow();
}
ManagedRpcServer::~ManagedRpcServer()
{
LOG(debug, "(role[%s].~ManagedRpcServer)", _name.c_str());
Kill();
cleanupMonitor();
}
void
ManagedRpcServer::cleanupMonitor()
{
_monitor.disable();
if (_monitoredServer != nullptr) {
_monitoredServer->internal_subref();
_monitoredServer = nullptr;
}
if (_checkServerReq != nullptr) {
_checkServerReq->Abort();
// _checkServerReq cleared by RequestDone Method
LOG_ASSERT(_checkServerReq == nullptr);
}
}
void
ManagedRpcServer::notifyDisconnected()
{
cleanupMonitor();
_mmanager.notifyFailedRpcSrv(this, "disconnected");
}
bool
ManagedRpcServer::validateRpcServer(uint32_t numstrings,
FRT_StringValue *strings)
{
for (uint32_t i = 0; i < numstrings; ++i) {
if (strcmp(strings[i]._str, _name.c_str()) == 0) {
return true;
}
}
LOG(info, "REMOVE: server at %s did not have %s in listNamesServed values",
_spec.c_str(), _name.c_str());
return false;
}
void
ManagedRpcServer::RequestDone(FRT_RPCRequest *req)
{
LOG_ASSERT(req == _checkServerReq);
FRT_Values &answer = *(req->GetReturn());
if (req->GetErrorCode() == FRTE_RPC_ABORT) {
LOG(debug, "rpcserver[%s].check aborted", getName().c_str());
req->internal_subref();
_checkServerReq = nullptr;
return;
}
if (req->IsError()
|| strcmp(answer.GetTypeString(), "S") != 0
|| ! validateRpcServer(answer[0]._string_array._len,
answer[0]._string_array._pt))
{
std::string errmsg;
if (req->IsError()) {
errmsg = req->GetErrorMessage();
} else if (strcmp(answer.GetTypeString(), "S") != 0) {
errmsg = "checkServer wrong return: ";
errmsg += answer.GetTypeString();
} else {
errmsg = "checkServer failed validation";
}
req->internal_subref();
_checkServerReq = nullptr;
cleanupMonitor();
_mmanager.notifyFailedRpcSrv(this, errmsg);
return;
}
// start monitoring connection to server
LOG_ASSERT(_monitoredServer != nullptr);
_monitor.enable(_monitoredServer);
req->internal_subref();
_checkServerReq = nullptr;
_mmanager.notifyOkRpcSrv(this);
}
//-----------------------------------------------------------------------------
} // namespace slobrok
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