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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "invoker.h"
#include "supervisor.h"
#include <vespa/fnet/channel.h>
#include <vespa/log/log.h>
LOG_SETUP(".fnet.frt.invoker");
FRT_SingleReqWait::FRT_SingleReqWait()
: _lock(),
_cond(),
_done(false),
_waiting(false)
{ }
FRT_SingleReqWait::~FRT_SingleReqWait() {}
void
FRT_SingleReqWait::WaitReq()
{
std::unique_lock<std::mutex> guard(_lock);
_waiting = true;
while(!_done) {
_cond.wait(guard);
}
_waiting = false;
}
void
FRT_SingleReqWait::RequestDone(FRT_RPCRequest *req)
{
(void) req;
std::lock_guard<std::mutex> guard(_lock);
_done = true;
if (_waiting) {
_cond.notify_one();
}
}
FRT_RPCInvoker::FRT_RPCInvoker(FRT_Supervisor *supervisor,
FRT_RPCRequest *req,
bool noReply)
: _req(req),
_method(supervisor->GetReflectionManager()
->LookupMethod(req->GetMethodName())),
_noReply(noReply)
{
if (LOG_WOULD_LOG(debug)) {
std::string methodName(_req->GetMethodName(), _req->GetMethodNameLen());
LOG(debug, "invoke(server) init: '%s'", methodName.c_str());
}
req->SetReturnHandler(this); // RPC req -> FNET_Connection link is via this ptr; set prior to access filter invocation.
if (_method == nullptr) {
if (!req->IsError()) { // may be BAD_REQUEST
req->SetError(FRTE_RPC_NO_SUCH_METHOD);
}
} else if (!FRT_Values::CheckTypes(_method->GetParamSpec(),
req->GetParamSpec()))
{
req->SetError(FRTE_RPC_WRONG_PARAMS);
} else if (_method->GetRequestAccessFilter() &&
!_method->GetRequestAccessFilter()->allow(*req))
{
req->SetError(FRTE_RPC_PERMISSION_DENIED);
}
}
bool FRT_RPCInvoker::Invoke()
{
bool detached = false;
_req->SetDetachedPT(&detached);
(_method->GetHandler()->*_method->GetMethod())(_req);
if (detached)
return false;
HandleDone(false);
return true;
}
void
FRT_RPCInvoker::HandleDone(bool freeChannel)
{
FNET_Channel *ch = _req->GetContext()._value.CHANNEL;
// check return value(s)
if (!_req->IsError() &&
!FRT_Values::CheckTypes(_method->GetReturnSpec(),
_req->GetReturnSpec()))
{
_req->SetError(FRTE_RPC_WRONG_RETURN);
}
if (LOG_WOULD_LOG(debug)) {
std::string methodName(_req->GetMethodName(), _req->GetMethodNameLen());
LOG(debug, "invoke(server) done: '%s': '%s'",
methodName.c_str(), FRT_GetErrorCodeName(_req->GetErrorCode()));
}
// send response to client or get rid of it
if (_noReply || (_req->GetErrorCode() == FRTE_RPC_BAD_REQUEST))
_req->internal_subref();
else
ch->Send(_req->CreateReplyPacket());
// free FNET channel (if not in packet delivery callback)
if (freeChannel)
ch->Free();
}
void
FRT_RPCInvoker::HandleReturn()
{
HandleDone(true);
}
FNET_Connection *
FRT_RPCInvoker::GetConnection()
{
return _req->GetContext()._value.CHANNEL->GetConnection();
}
//-----------------------------------------------------------------------------
void FRT_HookInvoker::Invoke()
{
bool detached = false;
_req->SetDetachedPT(&detached);
(_hook->GetHandler()->*_hook->GetMethod())(_req);
assert(!detached);
_req->internal_subref();
}
void
FRT_HookInvoker::HandleReturn()
{
// hooks cannot be detached
LOG_ABORT("should not be reached");
}
FNET_Connection *
FRT_HookInvoker::GetConnection()
{
return _conn;
}
//-----------------------------------------------------------------------------
FRT_RPCAdapter::FRT_RPCAdapter(FNET_Scheduler *scheduler,
FRT_RPCRequest *req,
FRT_IRequestWait *waiter)
: FNET_Task(scheduler),
_req(req),
_waiter(waiter),
_channel(nullptr)
{
if (LOG_WOULD_LOG(debug)) {
std::string methodName(_req->GetMethodName(), _req->GetMethodNameLen());
LOG(debug, "invoke(client) init: '%s'", methodName.c_str());
}
req->SetAbortHandler(this);
}
void
FRT_RPCAdapter::HandleDone()
{
if (LOG_WOULD_LOG(debug)) {
std::string methodName(_req->GetMethodName(), _req->GetMethodNameLen());
LOG(debug, "invoke(client) done: '%s': '%s'",
methodName.c_str(), FRT_GetErrorCodeName(_req->GetErrorCode()));
}
// give req back to caller
_waiter->RequestDone(_req);
}
bool
FRT_RPCAdapter::HandleAbort()
{
if (!_req->GetCompletionToken()) { // too late
return false;
}
if (_channel != nullptr) {
_channel->CloseAndFree();
}
Kill();
_req->SetError(FRTE_RPC_ABORT);
HandleDone();
return true;
}
void
FRT_RPCAdapter::PerformTask()
{
if (!_req->GetCompletionToken()) { // too late
return;
}
if (_channel != nullptr) {
_channel->CloseAndFree();
}
if (!_req->IsError()) {
_req->SetError(FRTE_RPC_TIMEOUT);
}
HandleDone();
}
FNET_IPacketHandler::HP_RetCode
FRT_RPCAdapter::HandlePacket(FNET_Packet *packet, FNET_Context)
{
if (!_req->GetCompletionToken()) { // too late
packet->Free();
return FNET_KEEP_CHANNEL;
}
Kill();
if (!packet->IsRegularPacket()) {
if (packet->IsChannelLostCMD()) {
_req->SetError(FRTE_RPC_CONNECTION);
}
if (packet->IsBadPacketCMD()) {
_req->SetError(FRTE_RPC_BAD_REPLY);
}
}
packet->Free();
HandleDone();
return FNET_FREE_CHANNEL;
}
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