YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

//

// The following only applies to changes made to this file as part of YugaByte development.

//

// Portions Copyright (c) YugaByte, Inc.

//

// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except

// in compliance with the License.  You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software distributed under the License

// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

// or implied.  See the License for the specific language governing permissions and limitations

// under the License.

//

#include "yb/consensus/consensus.h"

#include <set>

#include "yb/consensus/opid_util.h"

#include "yb/gutil/strings/substitute.h"

#include "yb/util/result.h"

#include "yb/util/status_format.h"

namespace yb {

namespace consensus {

using std::shared_ptr;

using strings::Substitute;

std::string LeaderElectionData::ToString() const {

  return YB_STRUCT_TO_STRING(mode, originator_uuid, pending_commit, must_be_committed_opid);

}

ConsensusBootstrapInfo::ConsensusBootstrapInfo()

  : last_id(MinimumOpId()),

    last_committed_id(MinimumOpId()) {

}

LeaderStatus Consensus::GetLeaderStatus(bool allow_stale) const {

  return GetLeaderState(allow_stale).status;

}

int64_t Consensus::LeaderTerm() const {

  return GetLeaderState().term;

}

void Consensus::SetFaultHooks(const shared_ptr<ConsensusFaultHooks>& hooks) {

  fault_hooks_ = hooks;

}

const shared_ptr<Consensus::ConsensusFaultHooks>& Consensus::GetFaultHooks() const {

  return fault_hooks_;

}

Status Consensus::ExecuteHook(HookPoint point) {

  if (PREDICT_FALSE(fault_hooks_.get() != nullptr)) {

    switch (point) {

      case Consensus::PRE_START: return fault_hooks_->PreStart();

      case Consensus::POST_START: return fault_hooks_->PostStart();

      case Consensus::PRE_CONFIG_CHANGE: return fault_hooks_->PreConfigChange();

      case Consensus::POST_CONFIG_CHANGE: return fault_hooks_->PostConfigChange();

      case Consensus::PRE_REPLICATE: return fault_hooks_->PreReplicate();

      case Consensus::POST_REPLICATE: return fault_hooks_->PostReplicate();

      case Consensus::PRE_UPDATE: return fault_hooks_->PreUpdate();

      case Consensus::POST_UPDATE: return fault_hooks_->PostUpdate();

      case Consensus::PRE_SHUTDOWN: return fault_hooks_->PreShutdown();

      case Consensus::POST_SHUTDOWN: return fault_hooks_->PostShutdown();

      default: LOG(FATAL) << "Unknown fault hook.";

    }

  }

  return Status::OK();

}

Result<OpId> Consensus::GetLastOpId(OpIdType type) {

  switch (type) {

    case OpIdType::RECEIVED_OPID:

      return GetLastReceivedOpId();

    case OpIdType::COMMITTED_OPID:

      return GetLastCommittedOpId();

    default:

      break;

  }

  return STATUS(InvalidArgument, "Unsupported OpIdType", OpIdType_Name(type));

}

Status Consensus::StepDown(const LeaderStepDownRequestPB* req, LeaderStepDownResponsePB* resp) {

  return STATUS(NotSupported, "Not implemented.");

}

Status Consensus::ChangeConfig(const ChangeConfigRequestPB& req,

                               const StdStatusCallback& client_cb,

                               boost::optional<tserver::TabletServerErrorPB::Code>* error) {

  return STATUS(NotSupported, "Not implemented.");

}

Status Consensus::ConsensusFaultHooks::PreStart() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PostStart() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PreConfigChange() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PostConfigChange() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PreReplicate() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PostReplicate() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PreUpdate() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PostUpdate() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PreShutdown() {

  return Status::OK();

}

Status Consensus::ConsensusFaultHooks::PostShutdown() {

  return Status::OK();

}

LeaderState& LeaderState::MakeNotReadyLeader(LeaderStatus status_) {

  status = status_;

  term = yb::OpId::kUnknownTerm;

  return *this;

}

Status LeaderState::CreateStatus() const {

  switch (status) {

    case consensus::LeaderStatus::NOT_LEADER:

      return STATUS(IllegalState, "Not the leader");

    case consensus::LeaderStatus::LEADER_BUT_NO_OP_NOT_COMMITTED:

        return STATUS(LeaderNotReadyToServe,

                      "Leader not yet replicated NoOp to be ready to serve requests");

    case consensus::LeaderStatus::LEADER_BUT_OLD_LEADER_MAY_HAVE_LEASE:

        return STATUS_FORMAT(LeaderNotReadyToServe,

                             "Previous leader's lease might still be active ($0 remaining).",

                             remaining_old_leader_lease);

    case consensus::LeaderStatus::LEADER_BUT_NO_MAJORITY_REPLICATED_LEASE:

        return STATUS(LeaderHasNoLease, "This leader has not yet acquired a lease.");

    case consensus::LeaderStatus::LEADER_AND_READY:

      return Status::OK();

  }

  FATAL_INVALID_ENUM_VALUE(consensus::LeaderStatus, status);

}

Status MoveStatus(LeaderState&& state) {

  return state.CreateStatus();

}

} // namespace consensus

} // namespace yb