int MasterStateMachine :: Init()
{
MasterVariables oVariables;
int ret = m_oMVStore.Read(m_iMyGroupIdx, oVariables);
if (ret != 0 && ret != 1)
{
PLG1Err("Master variables read from store fail, ret %d", ret);
return -1;
}
if (ret == 1)
{
PLG1Imp("no master variables exist");
}
else
{
m_llMasterVersion = oVariables.version();
if (oVariables.masternodeid() == m_iMyNodeID)
{
m_iMasterNodeID = nullnode;
m_llAbsExpireTime = 0;
}
else
{
m_iMasterNodeID = oVariables.masternodeid();
m_llAbsExpireTime = Time::GetTimestampMS() + oVariables.leasetime();
}
}
PLG1Head("OK, master nodeid %lu version %lu expiretime %u",
m_iMasterNodeID, m_llMasterVersion, m_llAbsExpireTime);
return 0;
}
int MasterStateMachine :: UpdateMasterToStore(const nodeid_t llMasterNodeID, const uint64_t llVersion, const uint32_t iLeaseTime)
{
MasterVariables oVariables;
oVariables.set_masternodeid(llMasterNodeID);
oVariables.set_version(llVersion);
oVariables.set_leasetime(iLeaseTime);
WriteOptions oWriteOptions;
oWriteOptions.bSync = false;
return m_oMVStore.Write(oWriteOptions, m_iMyGroupIdx, oVariables);
}
int MasterStateMachine :: GetCheckpointBuffer(std::string & sCPBuffer)
{
if (m_llMasterVersion == (uint64_t)-1)
{
return 0;
}
MasterVariables oVariables;
oVariables.set_masternodeid(m_iMasterNodeID);
oVariables.set_version(m_llMasterVersion);
oVariables.set_leasetime(m_iLeaseTime);
bool sSucc = oVariables.SerializeToString(&sCPBuffer);
if (!sSucc)
{
PLG1Err("Variables.Serialize fail");
return -1;
}
return 0;
}
int MasterStateMachine :: UpdateByCheckpoint(const std::string & sCPBuffer, bool & bChange)
{
if (sCPBuffer.size() == 0)
{
return 0;
}
MasterVariables oVariables;
bool bSucc = oVariables.ParseFromArray(sCPBuffer.data(), sCPBuffer.size());
if (!bSucc)
{
PLG1Err("Variables.ParseFromArray fail, bufferlen %zu", sCPBuffer.size());
return -1;
}
if (oVariables.version() <= m_llMasterVersion
&& m_llMasterVersion != (uint64_t)-1)
{
PLG1Imp("lag checkpoint, no need update, cp.version %lu now.version %lu",
oVariables.version(), m_llMasterVersion);
return 0;
}
int ret = UpdateMasterToStore(oVariables.masternodeid(), oVariables.version(), oVariables.leasetime());
if (ret != 0)
{
return -1;
}
PLG1Head("ok, cp.version %lu cp.masternodeid %lu old.version %lu old.masternodeid %lu",
oVariables.version(), oVariables.masternodeid(),
m_llMasterVersion, m_iMasterNodeID);
m_llMasterVersion = oVariables.version();
if (oVariables.masternodeid() == m_iMyNodeID)
{
m_iMasterNodeID = nullnode;
m_llAbsExpireTime = 0;
}
else
{
m_iMasterNodeID = oVariables.masternodeid();
m_llAbsExpireTime = Time::GetTimestampMS() + oVariables.leasetime();
}
return 0;
}
int MasterStateMachine :: UpdateByCheckpoint(const std::string & sCPBuffer, bool & bChange)
{
if (sCPBuffer.size() == 0)
{
return 0;
}
MasterVariables oVariables;
bool bSucc = oVariables.ParseFromArray(sCPBuffer.data(), sCPBuffer.size());
if (!bSucc)
{
PLG1Err("Variables.ParseFromArray fail, bufferlen %zu", sCPBuffer.size());
return -1;
}
std::lock_guard<std::mutex> oLockGuard(m_oMutex);
if (oVariables.version() <= m_llMasterVersion
&& m_llMasterVersion != (uint64_t)-1)
{
PLG1Imp("lag checkpoint, no need update, cp.version %lu now.version %lu",
oVariables.version(), m_llMasterVersion);
return 0;
}
int ret = UpdateMasterToStore(oVariables.masternodeid(), oVariables.version(), oVariables.leasetime());
if (ret != 0)
{
return -1;
}
PLG1Head("ok, cp.version %lu cp.masternodeid %lu old.version %lu old.masternodeid %lu",
oVariables.version(), oVariables.masternodeid(),
m_llMasterVersion, m_iMasterNodeID);
bool bMasterChange = false;
m_llMasterVersion = oVariables.version();
if (oVariables.masternodeid() == m_iMyNodeID)
{
m_iMasterNodeID = nullnode;
m_llAbsExpireTime = 0;
}
else
{
if (m_iMasterNodeID != oVariables.masternodeid())
{
bMasterChange = true;
}
m_iMasterNodeID = oVariables.masternodeid();
m_llAbsExpireTime = Time::GetSteadyClockMS() + oVariables.leasetime();
}
if (bMasterChange)
{
if (m_pMasterChangeCallback != nullptr)
{
m_pMasterChangeCallback(m_iMyGroupIdx, NodeInfo(m_iMasterNodeID), m_llMasterVersion);
}
}
return 0;
}
