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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "remote_slobrok.h"
#include "exchange_manager.h"
#include "sbenv.h"
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/frt/target.h>
#include <vespa/log/log.h>
LOG_SETUP(".slobrok.server.remote_slobrok");
namespace slobrok {
//-----------------------------------------------------------------------------
RemoteSlobrok::RemoteSlobrok(const std::string &name, const std::string &spec,
ExchangeManager &manager)
: _exchanger(manager),
_remote(nullptr),
_serviceMapMirror(),
_rpcserver(name, spec, *this),
_reconnecter(getSupervisor()->GetScheduler(), *this),
_failCnt(0),
_consensusSubscription(MapSubscription::subscribe(_serviceMapMirror, _exchanger.env().consensusMap())),
_remAddPeerReq(nullptr),
_remFetchReq(nullptr)
{
_rpcserver.healthCheck();
}
void RemoteSlobrok::shutdown() {
_reconnecter.disable();
if (_remote != nullptr) {
_remote->internal_subref();
_remote = nullptr;
}
if (_remFetchReq != nullptr) {
_remFetchReq->Abort();
}
if (_remAddPeerReq != nullptr) {
_remAddPeerReq->Abort();
}
_serviceMapMirror.clear();
}
RemoteSlobrok::~RemoteSlobrok() {
shutdown();
// _rpcserver destructor called automatically
}
void RemoteSlobrok::maybeStartFetch() {
if (_remFetchReq != nullptr) return;
if (_remote == nullptr) return;
_remFetchReq = getSupervisor()->AllocRPCRequest();
_remFetchReq->SetMethodName("slobrok.internal.fetchLocalView");
_remFetchReq->GetParams()->AddInt32(_serviceMapMirror.currentGeneration().getAsInt());
_remFetchReq->GetParams()->AddInt32(5000);
_remote->InvokeAsync(_remFetchReq, 15.0, this);
}
void RemoteSlobrok::handleFetchResult() {
LOG_ASSERT(_remFetchReq != nullptr);
bool success = true;
if (_remFetchReq->CheckReturnTypes("iSSSi")) {
FRT_Values &answer = *(_remFetchReq->GetReturn());
uint32_t diff_from = answer[0]._intval32;
uint32_t numRemove = answer[1]._string_array._len;
FRT_StringValue *r = answer[1]._string_array._pt;
uint32_t numNames = answer[2]._string_array._len;
FRT_StringValue *n = answer[2]._string_array._pt;
uint32_t numSpecs = answer[3]._string_array._len;
FRT_StringValue *s = answer[3]._string_array._pt;
uint32_t diff_to = answer[4]._intval32;
std::vector<vespalib::string> removed;
for (uint32_t idx = 0; idx < numRemove; ++idx) {
removed.emplace_back(r[idx]._str);
}
ServiceMappingList updated;
if (numNames == numSpecs) {
for (uint32_t idx = 0; idx < numNames; ++idx) {
updated.emplace_back(n[idx]._str, s[idx]._str);
}
} else {
diff_from = 0;
diff_to = 0;
success = false;
}
MapDiff diff(diff_from, std::move(removed), std::move(updated), diff_to);
if (diff_from == 0) {
_serviceMapMirror.clear();
_serviceMapMirror.apply(std::move(diff));
} else if (diff_from == _serviceMapMirror.currentGeneration().getAsInt()) {
_serviceMapMirror.apply(std::move(diff));
} else {
_serviceMapMirror.clear();
success = false;
}
} else {
if (_remFetchReq->GetErrorCode() == FRTE_RPC_NO_SUCH_METHOD) {
LOG(debug, "partner slobrok too old - not mirroring");
} else {
LOG(debug, "fetchLocalView() failed with partner %s: %s",
getName().c_str(), _remFetchReq->GetErrorMessage());
fail();
}
_serviceMapMirror.clear();
success = false;
}
_remFetchReq->internal_subref();
_remFetchReq = nullptr;
if (success) {
maybeStartFetch();
}
}
void
RemoteSlobrok::RequestDone(FRT_RPCRequest *req)
{
if (req == _remFetchReq) {
handleFetchResult();
return;
}
if (req == _remAddPeerReq) {
// handle response after asking remote slobrok to add me as a peer:
if (req->IsError()) {
FRT_Values &args = *req->GetParams();
const char *myname = args[0]._string._str;
const char *myspec = args[1]._string._str;
LOG(info, "addPeer(%s, %s) on remote slobrok %s at %s: %s",
myname, myspec, getName().c_str(), getSpec().c_str(), req->GetErrorMessage());
req->internal_subref();
_remAddPeerReq = nullptr;
fail();
return;
}
req->internal_subref();
_remAddPeerReq = nullptr;
} else {
LOG(error, "got unknown request back in RequestDone()");
LOG_ASSERT(req == nullptr);
}
}
void
RemoteSlobrok::notifyFailedRpcSrv(ManagedRpcServer *rpcsrv, std::string errmsg)
{
if (++_failCnt > 10) {
LOG(warning, "remote location broker at %s failed: %s",
rpcsrv->getSpec().c_str(), errmsg.c_str());
} else {
LOG(debug, "remote location broker at %s failed: %s",
rpcsrv->getSpec().c_str(), errmsg.c_str());
}
LOG_ASSERT(rpcsrv == &_rpcserver);
fail();
}
void
RemoteSlobrok::fail()
{
// disconnect
if (_remote != nullptr) {
_remote->internal_subref();
_remote = nullptr;
}
// schedule reconnect attempt
_reconnecter.scheduleTryConnect();
}
void
RemoteSlobrok::notifyOkRpcSrv(ManagedRpcServer *rpcsrv)
{
LOG_ASSERT(rpcsrv == &_rpcserver);
(void) rpcsrv;
// connection was OK, so disable any pending reconnect
_reconnecter.disable();
if (_remote != nullptr) {
maybeStartFetch();
// the rest here should only be done on first notifyOk
return;
}
_remote = getSupervisor()->GetTarget(getSpec().c_str());
maybeStartFetch();
// at this point, we will ask peer to connect to us too;
// any failure will cause disconnect and retry.
_remAddPeerReq = getSupervisor()->AllocRPCRequest();
_remAddPeerReq->SetMethodName("slobrok.admin.addPeer");
_remAddPeerReq->GetParams()->AddString(_exchanger.env().mySpec().c_str());
_remAddPeerReq->GetParams()->AddString(_exchanger.env().mySpec().c_str());
_remote->InvokeAsync(_remAddPeerReq, 3.0, this);
}
void
RemoteSlobrok::tryConnect()
{
_rpcserver.healthCheck();
}
FRT_Supervisor *
RemoteSlobrok::getSupervisor()
{
return _exchanger.env().getSupervisor();
}
//-----------------------------------------------------------------------------
RemoteSlobrok::Reconnecter::Reconnecter(FNET_Scheduler *sched,
RemoteSlobrok &owner)
: FNET_Task(sched),
_waittime(13),
_owner(owner)
{
}
RemoteSlobrok::Reconnecter::~Reconnecter()
{
Kill();
}
void
RemoteSlobrok::Reconnecter::scheduleTryConnect()
{
if (_waittime < 60)
++_waittime;
Schedule(_waittime + (random() & 255)/100.0);
}
void
RemoteSlobrok::Reconnecter::disable()
{
// called when connection OK
Unschedule();
_waittime = 13;
}
void
RemoteSlobrok::Reconnecter::PerformTask()
{
_owner.tryConnect();
}
void
RemoteSlobrok::invokeAsync(FRT_RPCRequest *req,
double timeout,
FRT_IRequestWait *rwaiter)
{
LOG_ASSERT(isConnected());
_remote->InvokeAsync(req, timeout, rwaiter);
}
//-----------------------------------------------------------------------------
} // namespace slobrok
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