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#include "http_proxy.h"
#include "http_proxy_sock_impl.h"
namespace NHttp {
template <typename TSocketImpl>
class TOutgoingConnectionActor : public NActors::TActor<TOutgoingConnectionActor<TSocketImpl>>, public TSocketImpl, virtual public THttpConfig {
public:
using TBase = NActors::TActor<TOutgoingConnectionActor<TSocketImpl>>;
using TSelf = TOutgoingConnectionActor<TSocketImpl>;
const TActorId Owner;
const TActorId Poller;
SocketAddressType Address;
TString Host;
TActorId RequestOwner;
THttpOutgoingRequestPtr Request;
THttpIncomingResponsePtr Response;
TInstant LastActivity;
TDuration ConnectionTimeout = CONNECTION_TIMEOUT;
NActors::TPollerToken::TPtr PollerToken;
TOutgoingConnectionActor(const TActorId& owner, const TString& host, const TActorId& poller)
: TBase(&TSelf::StateWaiting)
, Owner(owner)
, Poller(poller)
, Host(host)
{
TSocketImpl::SetNonBlock();
TSocketImpl::SetTimeout(SOCKET_TIMEOUT);
}
void Die(const NActors::TActorContext& ctx) override {
ctx.Send(Owner, new TEvHttpProxy::TEvHttpConnectionClosed(ctx.SelfID));
TSocketImpl::Shutdown(); // to avoid errors when connection already closed
TBase::Die(ctx);
}
void ReplyAndDie(const NActors::TActorContext& ctx) {
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") -> (" << Response->Status << " " << Response->Message << ")");
ctx.Send(RequestOwner, new TEvHttpProxy::TEvHttpIncomingResponse(Request, Response));
RequestOwner = TActorId();
THolder<TEvHttpProxy::TEvReportSensors> sensors(BuildOutgoingRequestSensors(Request, Response));
ctx.Send(Owner, sensors.Release());
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") connection closed");
Die(ctx);
}
void ReplyErrorAndDie(const NActors::TActorContext& ctx, const TString& error) {
LOG_ERROR_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") connection closed with error: " << error);
if (RequestOwner) {
ctx.Send(RequestOwner, new TEvHttpProxy::TEvHttpIncomingResponse(Request, Response, error));
RequestOwner = TActorId();
THolder<TEvHttpProxy::TEvReportSensors> sensors(BuildOutgoingRequestSensors(Request, Response));
ctx.Send(Owner, sensors.Release());
Die(ctx);
}
}
protected:
void FailConnection(const NActors::TActorContext& ctx, const TString& error) {
if (Request) {
return ReplyErrorAndDie(ctx, error);
}
return TBase::Become(&TOutgoingConnectionActor::StateFailed);
}
void Connect(const NActors::TActorContext& ctx) {
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") connecting");
int res = TSocketImpl::Connect(Address);
RegisterPoller(ctx);
switch (-res) {
case 0:
return OnConnect(ctx);
case EINPROGRESS:
case EAGAIN:
return TBase::Become(&TOutgoingConnectionActor::StateConnecting);
default:
return ReplyErrorAndDie(ctx, strerror(-res));
}
}
void FlushOutput(const NActors::TActorContext& ctx) {
if (Request != nullptr) {
Request->Finish();
while (auto size = Request->Size()) {
bool read = false, write = false;
ssize_t res = TSocketImpl::Send(Request->Data(), size, read, write);
if (res > 0) {
Request->ChopHead(res);
} else if (-res == EINTR) {
continue;
} else if (-res == EAGAIN || -res == EWOULDBLOCK) {
if (PollerToken) {
if (!read && !write) {
write = true;
}
PollerToken->Request(read, write);
}
break;
} else {
if (!res) {
ReplyAndDie(ctx);
} else {
ReplyErrorAndDie(ctx, strerror(-res));
}
break;
}
}
}
}
void PullInput(const NActors::TActorContext& ctx) {
for (;;) {
if (Response == nullptr) {
Response = new THttpIncomingResponse(Request);
}
if (!Response->EnsureEnoughSpaceAvailable()) {
return ReplyErrorAndDie(ctx, "Not enough space in socket buffer");
}
bool read = false, write = false;
ssize_t res = TSocketImpl::Recv(Response->Pos(), Response->Avail(), read, write);
if (res > 0) {
Response->Advance(res);
if (Response->IsDone() && Response->IsReady()) {
return ReplyAndDie(ctx);
}
} else if (-res == EINTR) {
continue;
} else if (-res == EAGAIN || -res == EWOULDBLOCK) {
if (PollerToken) {
if (!read && !write) {
read = true;
}
PollerToken->Request(read, write);
}
return;
} else {
if (!res) {
Response->ConnectionClosed();
}
if (Response->IsDone() && Response->IsReady()) {
return ReplyAndDie(ctx);
}
return ReplyErrorAndDie(ctx, strerror(-res));
}
}
}
void RegisterPoller(const NActors::TActorContext& ctx) {
ctx.Send(Poller, new NActors::TEvPollerRegister(TSocketImpl::Socket, ctx.SelfID, ctx.SelfID));
}
void OnConnect(const NActors::TActorContext& ctx) {
bool read = false, write = false;
if (int res = TSocketImpl::OnConnect(read, write); res != 1) {
if (-res == EAGAIN) {
if (PollerToken) {
PollerToken->Request(read, write);
}
return;
} else {
return ReplyErrorAndDie(ctx, strerror(-res));
}
}
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") outgoing connection opened");
TBase::Become(&TOutgoingConnectionActor::StateConnected);
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << "," << Address << ") <- (" << Request->Method << " " << Request->URL << ")");
ctx.Send(ctx.SelfID, new NActors::TEvPollerReady(nullptr, true, true));
}
void HandleResolving(TEvHttpProxy::TEvResolveHostResponse::TPtr event, const NActors::TActorContext& ctx) {
LastActivity = ctx.Now();
if (!event->Get()->Error.empty()) {
return FailConnection(ctx, event->Get()->Error);
}
Address = event->Get()->Address;
if (Address.GetPort() == 0) {
Address.SetPort(Request->Secure ? 443 : 80);
}
Connect(ctx);
}
void HandleConnecting(NActors::TEvPollerReady::TPtr, const NActors::TActorContext& ctx) {
LastActivity = ctx.Now();
int res = TSocketImpl::GetError();
if (res == 0) {
OnConnect(ctx);
} else {
FailConnection(ctx, TStringBuilder() << strerror(res));
}
}
void HandleConnecting(NActors::TEvPollerRegisterResult::TPtr ev, const NActors::TActorContext& ctx) {
PollerToken = std::move(ev->Get()->PollerToken);
LastActivity = ctx.Now();
int res = TSocketImpl::GetError();
if (res == 0) {
OnConnect(ctx);
} else {
FailConnection(ctx, TStringBuilder() << strerror(res));
}
}
void HandleWaiting(TEvHttpProxy::TEvHttpOutgoingRequest::TPtr event, const NActors::TActorContext& ctx) {
LastActivity = ctx.Now();
Request = std::move(event->Get()->Request);
Host = Request->Host;
LOG_DEBUG_S(ctx, HttpLog, "(#" << TSocketImpl::GetRawSocket() << ") resolving " << Host);
Request->Timer.Reset();
RequestOwner = event->Sender;
ctx.Send(Owner, new TEvHttpProxy::TEvResolveHostRequest(Host));
if (event->Get()->Timeout) {
ConnectionTimeout = event->Get()->Timeout;
TSocketImpl::SetTimeout(ConnectionTimeout);
}
ctx.Schedule(ConnectionTimeout, new NActors::TEvents::TEvWakeup());
LastActivity = ctx.Now();
TBase::Become(&TOutgoingConnectionActor::StateResolving);
}
void HandleConnected(NActors::TEvPollerReady::TPtr event, const NActors::TActorContext& ctx) {
LastActivity = ctx.Now();
if (event->Get()->Read) {
PullInput(ctx);
}
if (event->Get()->Write) {
FlushOutput(ctx);
}
}
void HandleConnected(NActors::TEvPollerRegisterResult::TPtr ev, const NActors::TActorContext& ctx) {
PollerToken = std::move(ev->Get()->PollerToken);
LastActivity = ctx.Now();
PullInput(ctx);
FlushOutput(ctx);
}
void HandleFailed(TEvHttpProxy::TEvHttpOutgoingRequest::TPtr event, const NActors::TActorContext& ctx) {
Request = std::move(event->Get()->Request);
RequestOwner = event->Sender;
ReplyErrorAndDie(ctx, "Failed");
}
void HandleTimeout(const NActors::TActorContext& ctx) {
TDuration inactivityTime = ctx.Now() - LastActivity;
if (inactivityTime >= ConnectionTimeout) {
FailConnection(ctx, "Connection timed out");
} else {
ctx.Schedule(Min(ConnectionTimeout - inactivityTime, TDuration::MilliSeconds(100)), new NActors::TEvents::TEvWakeup());
}
}
STFUNC(StateWaiting) {
switch (ev->GetTypeRewrite()) {
HFunc(TEvHttpProxy::TEvHttpOutgoingRequest, HandleWaiting);
CFunc(NActors::TEvents::TEvWakeup::EventType, HandleTimeout);
}
}
STFUNC(StateResolving) {
switch (ev->GetTypeRewrite()) {
HFunc(TEvHttpProxy::TEvResolveHostResponse, HandleResolving);
CFunc(NActors::TEvents::TEvWakeup::EventType, HandleTimeout);
}
}
STFUNC(StateConnecting) {
switch (ev->GetTypeRewrite()) {
HFunc(NActors::TEvPollerReady, HandleConnecting);
CFunc(NActors::TEvents::TEvWakeup::EventType, HandleTimeout);
HFunc(NActors::TEvPollerRegisterResult, HandleConnecting);
}
}
STFUNC(StateConnected) {
switch (ev->GetTypeRewrite()) {
HFunc(NActors::TEvPollerReady, HandleConnected);
CFunc(NActors::TEvents::TEvWakeup::EventType, HandleTimeout);
HFunc(NActors::TEvPollerRegisterResult, HandleConnected);
}
}
STFUNC(StateFailed) {
switch (ev->GetTypeRewrite()) {
HFunc(TEvHttpProxy::TEvHttpOutgoingRequest, HandleFailed);
}
}
};
NActors::IActor* CreateOutgoingConnectionActor(const TActorId& owner, const TString& host, bool secure, const TActorId& poller) {
if (secure) {
return new TOutgoingConnectionActor<TSecureSocketImpl>(owner, host, poller);
} else {
return new TOutgoingConnectionActor<TPlainSocketImpl>(owner, host, poller);
}
}
}
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