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#include "roaming_channel.h"
#include "channel_detail.h"
#include "client.h"
#include <yt/yt/core/actions/future.h>
namespace NYT::NRpc {
using namespace NBus;
using namespace NYson;
using namespace NYTree;
////////////////////////////////////////////////////////////////////////////////
class TRoamingRequestControl
: public TClientRequestControlThunk
{
public:
TRoamingRequestControl(
TFuture<IChannelPtr> asyncChannel,
IClientRequestPtr request,
IClientResponseHandlerPtr responseHandler,
const TSendOptions& options)
: Request_(std::move(request))
, ResponseHandler_(std::move(responseHandler))
, Options_(options)
, StartTime_(TInstant::Now())
{
if (Options_.Timeout) {
asyncChannel = asyncChannel.WithTimeout(*Options_.Timeout, TFutureTimeoutOptions{
.Error = TError("Error getting channel")
});
}
asyncChannel.Subscribe(BIND(&TRoamingRequestControl::OnGotChannel, MakeStrong(this)));
}
void Cancel() override
{
if (!TryAcquireSemaphore()) {
TClientRequestControlThunk::Cancel();
return;
}
ResponseHandler_->HandleError(TError(NYT::EErrorCode::Canceled, "RPC request canceled")
<< TErrorAttribute("request_id", Request_->GetRequestId())
<< TErrorAttribute("realm_id", Request_->GetRealmId())
<< TErrorAttribute("service", Request_->GetService())
<< TErrorAttribute("method", Request_->GetMethod()));
Request_.Reset();
ResponseHandler_.Reset();
}
private:
IClientRequestPtr Request_;
IClientResponseHandlerPtr ResponseHandler_;
const TSendOptions Options_;
const TInstant StartTime_;
std::atomic<bool> Semaphore_ = false;
bool TryAcquireSemaphore()
{
bool expected = false;
return Semaphore_.compare_exchange_strong(expected, true);
}
void OnGotChannel(const TErrorOr<IChannelPtr>& result)
{
if (!TryAcquireSemaphore()) {
return;
}
auto request = std::move(Request_);
auto responseHandler = std::move(ResponseHandler_);
if (!result.IsOK()) {
responseHandler->HandleError(result);
return;
}
auto adjustedOptions = Options_;
if (Options_.Timeout) {
auto now = TInstant::Now();
auto deadline = StartTime_ + *Options_.Timeout;
adjustedOptions.Timeout = now > deadline ? TDuration::Zero() : deadline - now;
}
const auto& channel = result.Value();
auto requestControl = channel->Send(
request,
responseHandler,
adjustedOptions);
SetUnderlying(std::move(requestControl));
}
};
class TSyncRoamingRequestControl
: public TClientRequestControlThunk
{
public:
TSyncRoamingRequestControl(
IClientRequestControlPtr requestControl,
IChannelPtr channel)
: Channel_(std::move(channel))
{
SetUnderlying(std::move(requestControl));
}
private:
const IChannelPtr Channel_;
};
////////////////////////////////////////////////////////////////////////////////
class TRoamingChannel
: public IChannel
{
public:
explicit TRoamingChannel(IRoamingChannelProviderPtr provider)
: Provider_(std::move(provider))
{ }
const TString& GetEndpointDescription() const override
{
return Provider_->GetEndpointDescription();
}
const IAttributeDictionary& GetEndpointAttributes() const override
{
return Provider_->GetEndpointAttributes();
}
IClientRequestControlPtr Send(
IClientRequestPtr request,
IClientResponseHandlerPtr responseHandler,
const TSendOptions& options) override
{
YT_ASSERT(request);
YT_ASSERT(responseHandler);
auto asyncChannel = Provider_->GetChannel(request);
// NB: Optimize for the typical case of sync channel acquisition.
if (auto channelOrError = asyncChannel.TryGet()) {
if (channelOrError->IsOK()) {
const auto& channel = channelOrError->Value();
return New<TSyncRoamingRequestControl>(
channel->Send(
std::move(request),
std::move(responseHandler),
options),
channel);
} else {
responseHandler->HandleError(std::move(*channelOrError));
return New<TClientRequestControlThunk>();
}
}
return New<TRoamingRequestControl>(
std::move(asyncChannel),
std::move(request),
std::move(responseHandler),
options);
}
void Terminate(const TError& error) override
{
Provider_->Terminate(error);
}
void SubscribeTerminated(const TCallback<void(const TError&)>& /*callback*/) override
{ }
void UnsubscribeTerminated(const TCallback<void(const TError&)>& /*callback*/) override
{ }
int GetInflightRequestCount() override
{
return 0;
}
const IMemoryUsageTrackerPtr& GetChannelMemoryTracker() override
{
return MemoryUsageTracker_;
}
private:
const IRoamingChannelProviderPtr Provider_;
const IMemoryUsageTrackerPtr MemoryUsageTracker_ = GetNullMemoryUsageTracker();
};
IChannelPtr CreateRoamingChannel(IRoamingChannelProviderPtr provider)
{
YT_VERIFY(provider);
return New<TRoamingChannel>(std::move(provider));
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NRpc
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