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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "translogclient.h"
#include "common.h"
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/frt/target.h>
#include <vespa/fnet/frt/rpcrequest.h>
#include <vespa/fnet/transport.h>
#include <vespa/vespalib/util/threadstackexecutor.h>
#include <vespa/vespalib/util/size_literals.h>
#include <vespa/log/log.h>
LOG_SETUP(".translogclient");
using namespace std::chrono_literals;
VESPA_THREAD_STACK_TAG(translogclient_rpc_callback)
namespace search::transactionlog::client {
namespace {
const double NEVER(-1.0);
}
namespace {
struct RpcTask : public vespalib::Executor::Task {
FRT_RPCRequest *req;
std::function<void(FRT_RPCRequest *req)> fun;
RpcTask(FRT_RPCRequest *req_in, std::function<void(FRT_RPCRequest *req)> &&fun_in)
: req(req_in), fun(std::move(fun_in)) {}
void run() override {
fun(req);
req->Return();
req = nullptr;
}
~RpcTask() override {
if (req != nullptr) {
req->SetError(FRTE_RPC_METHOD_FAILED, "client has been shut down");
req->Return();
}
}
};
}
TransLogClient::TransLogClient(FNET_Transport & transport, const vespalib::string & rpcTarget) :
_executor(std::make_unique<vespalib::ThreadStackExecutor>(1, translogclient_rpc_callback)),
_rpcTarget(rpcTarget),
_sessions(),
_supervisor(std::make_unique<FRT_Supervisor>(&transport)),
_target(nullptr)
{
reconnect();
exportRPC(*_supervisor);
}
TransLogClient::~TransLogClient()
{
disconnect();
_executor->shutdown().sync();
_supervisor->GetTransport()->sync();
}
bool
TransLogClient::reconnect()
{
disconnect();
_target = _supervisor->Get2WayTarget(_rpcTarget.c_str());
return isConnected();
}
bool
TransLogClient::isConnected() const {
return (_target != nullptr) && _target->IsValid();
}
void
TransLogClient::disconnect()
{
if (_target) {
_target->internal_subref();
}
}
bool
TransLogClient::create(const vespalib::string & domain)
{
FRT_RPCRequest *req = _supervisor->AllocRPCRequest();
req->SetMethodName("createDomain");
req->GetParams()->AddString(domain.c_str());
int32_t retval(rpc(req));
req->internal_subref();
return (retval == 0);
}
bool
TransLogClient::remove(const vespalib::string & domain)
{
FRT_RPCRequest *req = _supervisor->AllocRPCRequest();
req->SetMethodName("deleteDomain");
req->GetParams()->AddString(domain.c_str());
int32_t retval(rpc(req));
req->internal_subref();
return (retval == 0);
}
std::unique_ptr<Session>
TransLogClient::open(const vespalib::string & domain)
{
FRT_RPCRequest *req = _supervisor->AllocRPCRequest();
req->SetMethodName("openDomain");
req->GetParams()->AddString(domain.c_str());
int32_t retval(rpc(req));
req->internal_subref();
if (retval == 0) {
return std::make_unique<Session>(domain, *this);
}
return std::unique_ptr<Session>();
}
std::unique_ptr<Visitor>
TransLogClient::createVisitor(const vespalib::string & domain, Callback & callBack)
{
return std::make_unique<Visitor>(domain, *this, callBack);
}
bool
TransLogClient::listDomains(std::vector<vespalib::string> & dir)
{
FRT_RPCRequest *req = _supervisor->AllocRPCRequest();
req->SetMethodName("listDomains");
int32_t retval(rpc(req));
if (retval == 0) {
char * s = req->GetReturn()->GetValue(1)._string._str;
for (const char * d(strsep(&s, "\n")); d && (*d != '\0'); d = strsep(&s, "\n")) {
dir.push_back(d);
}
}
req->internal_subref();
return (retval == 0);
}
int32_t
TransLogClient::rpc(FRT_RPCRequest * req)
{
int32_t retval(-7);
if (_target) {
_target->InvokeSync(req, NEVER);
if (req->GetErrorCode() == FRTE_NO_ERROR) {
retval = (req->GetReturn()->GetValue(0)._intval32);
LOG(debug, "rpc %s = %d", req->GetMethodName(), retval);
} else {
LOG(warning, "%s: error(%d): %s", req->GetMethodName(), req->GetErrorCode(), req->GetErrorMessage());
}
} else {
retval = -6;
}
return retval;
}
Session *
TransLogClient::findSession(const vespalib::string & domainName, int sessionId)
{
SessionKey key(domainName, sessionId);
auto found = _sessions.find(key);
Session * session((found != _sessions.end()) ? found->second : nullptr);
return session;
}
void
TransLogClient::exportRPC(FRT_Supervisor & supervisor)
{
FRT_ReflectionBuilder rb( & supervisor);
//-- Visit Callbacks -----------------------------------------------------------
rb.DefineMethod("visitCallback", "six", "i", FRT_METHOD(TransLogClient::visitCallbackRPC_hook), this);
rb.MethodDesc("Will return data asked from a subscriber/visitor.");
rb.ParamDesc("name", "The name of the domain.");
rb.ParamDesc("session", "Session handle.");
rb.ParamDesc("packet", "The data packet.");
rb.ReturnDesc("result", "A resultcode(int) of the operation. Non zero number indicates error.");
//-- Visit Callbacks -----------------------------------------------------------
rb.DefineMethod("eofCallback", "si", "i", FRT_METHOD(TransLogClient::eofCallbackRPC_hook), this);
rb.MethodDesc("Will tell you that you are done with the visitor.");
rb.ParamDesc("name", "The name of the domain.");
rb.ParamDesc("session", "Session handle.");
rb.ReturnDesc("result", "A resultcode(int) of the operation. Non zero number indicates error.");
}
void
TransLogClient::do_visitCallbackRPC(FRT_RPCRequest *req)
{
uint32_t retval(uint32_t(-1));
FRT_Values & params = *req->GetParams();
FRT_Values & ret = *req->GetReturn();
const char * domainName = params[0]._string._str;
int32_t sessionId(params[1]._intval32);
LOG(spam, "visitCallback(%s, %d)(%d)", domainName, sessionId, params[2]._data._len);
Session * session(findSession(domainName, sessionId));
if (session != nullptr) {
Packet packet(params[2]._data._buf, params[2]._data._len);
retval = session->visit(packet);
}
ret.AddInt32(retval);
LOG(debug, "visitCallback(%s, %d)=%d done", domainName, sessionId, retval);
}
void
TransLogClient::do_eofCallbackRPC(FRT_RPCRequest *req)
{
uint32_t retval(uint32_t(-1));
FRT_Values & params = *req->GetParams();
FRT_Values & ret = *req->GetReturn();
const char * domainName = params[0]._string._str;
int32_t sessionId(params[1]._intval32);
LOG(debug, "eofCallback(%s, %d)", domainName, sessionId);
Session * session(findSession(domainName, sessionId));
if (session != nullptr) {
session->eof();
retval = 0;
}
ret.AddInt32(retval);
LOG(debug, "eofCallback(%s, %d)=%d done", domainName, sessionId, retval);
}
void
TransLogClient::visitCallbackRPC_hook(FRT_RPCRequest *req)
{
_executor->execute(std::make_unique<RpcTask>(req->Detach(), [this](FRT_RPCRequest *x){ do_visitCallbackRPC(x); }));
}
void
TransLogClient::eofCallbackRPC_hook(FRT_RPCRequest *req)
{
_executor->execute(std::make_unique<RpcTask>(req->Detach(), [this](FRT_RPCRequest *x){ do_eofCallbackRPC(x); }));
}
}
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