/*
 * 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.
 */
package org.apache.hadoop.hbase.master.replication;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
import org.apache.hadoop.hbase.master.procedure.PeerProcedureInterface;
import org.apache.hadoop.hbase.master.procedure.RSProcedureDispatcher.ServerOperation;
import org.apache.hadoop.hbase.master.procedure.ServerRemoteProcedure;
import org.apache.hadoop.hbase.procedure2.ProcedureStateSerializer;
import org.apache.hadoop.hbase.procedure2.RemoteProcedureDispatcher.RemoteOperation;
import org.apache.hadoop.hbase.replication.regionserver.ReplaySyncReplicationWALCallable;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.ReplaySyncReplicationWALParameter;
import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.SyncReplicationReplayWALRemoteStateData;

/**
 * A remote procedure which is used to send replaying remote wal work to region server.
 */
@InterfaceAudience.Private
public class SyncReplicationReplayWALRemoteProcedure extends ServerRemoteProcedure
  implements PeerProcedureInterface {

  private static final Logger LOG =
    LoggerFactory.getLogger(SyncReplicationReplayWALRemoteProcedure.class);

  private String peerId;

  private List<String> wals;

  public SyncReplicationReplayWALRemoteProcedure() {
  }

  public SyncReplicationReplayWALRemoteProcedure(String peerId, List<String> wals,
    ServerName targetServer) {
    this.peerId = peerId;
    this.wals = wals;
    this.targetServer = targetServer;
  }

  @Override
  public Optional<RemoteOperation> remoteCallBuild(MasterProcedureEnv env, ServerName remote) {
    ReplaySyncReplicationWALParameter.Builder builder =
      ReplaySyncReplicationWALParameter.newBuilder();
    builder.setPeerId(peerId);
    wals.stream().forEach(builder::addWal);
    return Optional.of(new ServerOperation(this, getProcId(),
      ReplaySyncReplicationWALCallable.class, builder.build().toByteArray()));
  }

  protected void complete(MasterProcedureEnv env, Throwable error) {
    if (error != null) {
      LOG.warn("Replay wals {} on {} failed for peer id={}", wals, targetServer, peerId, error);
      this.succ = false;
    } else {
      truncateWALs(env);
      LOG.info("Replay wals {} on {} succeed for peer id={}", wals, targetServer, peerId);
      this.succ = true;
    }
  }

  /**
   * Only truncate wals one by one when task succeed. The parent procedure will check the first wal
   * length to know whether this task succeed.
   */
  private void truncateWALs(MasterProcedureEnv env) {
    String firstWal = wals.get(0);
    try {
      env.getMasterServices().getSyncReplicationReplayWALManager().finishReplayWAL(firstWal);
    } catch (IOException e) {
      // As it is idempotent to rerun this task. Just ignore this exception and return.
      LOG.warn("Failed to truncate wal {} for peer id={}", firstWal, peerId, e);
      return;
    }
    for (int i = 1; i < wals.size(); i++) {
      String wal = wals.get(i);
      try {
        env.getMasterServices().getSyncReplicationReplayWALManager().finishReplayWAL(wal);
      } catch (IOException e1) {
        try {
          // retry
          env.getMasterServices().getSyncReplicationReplayWALManager().finishReplayWAL(wal);
        } catch (IOException e2) {
          // As the parent procedure only check the first wal length. Just ignore this exception.
          LOG.warn("Failed to truncate wal {} for peer id={}", wal, peerId, e2);
        }
      }
    }
  }

  @Override
  protected void rollback(MasterProcedureEnv env) throws IOException, InterruptedException {
    throw new UnsupportedOperationException();
  }

  @Override
  protected boolean abort(MasterProcedureEnv env) {
    return false;
  }

  @Override
  protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException {
    SyncReplicationReplayWALRemoteStateData.Builder builder =
      SyncReplicationReplayWALRemoteStateData.newBuilder().setPeerId(peerId)
        .setTargetServer(ProtobufUtil.toServerName(targetServer));
    wals.stream().forEach(builder::addWal);
    serializer.serialize(builder.build());
  }

  @Override
  protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {
    SyncReplicationReplayWALRemoteStateData data =
      serializer.deserialize(SyncReplicationReplayWALRemoteStateData.class);
    peerId = data.getPeerId();
    wals = new ArrayList<>();
    data.getWalList().forEach(wals::add);
    targetServer = ProtobufUtil.toServerName(data.getTargetServer());
  }

  @Override
  public String getPeerId() {
    return peerId;
  }

  @Override
  public PeerOperationType getPeerOperationType() {
    return PeerOperationType.SYNC_REPLICATION_REPLAY_WAL_REMOTE;
  }
}