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/*
 * 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.solr.handler.component;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import net.jcip.annotations.NotThreadSafe;
import org.apache.solr.client.solrj.SolrRequest;
import org.apache.solr.client.solrj.SolrResponse;
import org.apache.solr.client.solrj.impl.LBHttp2SolrClient;
import org.apache.solr.client.solrj.impl.LBSolrClient;
import org.apache.solr.client.solrj.request.QueryRequest;
import org.apache.solr.client.solrj.routing.NoOpReplicaListTransformer;
import org.apache.solr.client.solrj.routing.ReplicaListTransformer;
import org.apache.solr.cloud.CloudDescriptor;
import org.apache.solr.cloud.ZkController;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.Replica;
import org.apache.solr.common.cloud.ZkCoreNodeProps;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.ShardParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.CoreDescriptor;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrRequestInfo;
import org.apache.solr.security.AllowListUrlChecker;

@NotThreadSafe
public class HttpShardHandler extends ShardHandler {
  /**
   * If the request context map has an entry with this key and Boolean.TRUE as value, {@link
   * #prepDistributed(ResponseBuilder)} will only include {@link
   * org.apache.solr.common.cloud.Replica.Type#NRT} replicas as possible destination of the
   * distributed request (or a leader replica of type {@link
   * org.apache.solr.common.cloud.Replica.Type#TLOG}). This is used by the RealtimeGet handler,
   * since other types of replicas shouldn't respond to RTG requests
   */
  public static String ONLY_NRT_REPLICAS = "distribOnlyRealtime";

  private HttpShardHandlerFactory httpShardHandlerFactory;
  private Map> responseFutureMap;
  private BlockingQueue responses;
  private AtomicInteger pending;
  private Map> shardToURLs;
  private LBHttp2SolrClient lbClient;

  public HttpShardHandler(HttpShardHandlerFactory httpShardHandlerFactory) {
    this.httpShardHandlerFactory = httpShardHandlerFactory;
    this.lbClient = httpShardHandlerFactory.loadbalancer;
    this.pending = new AtomicInteger(0);
    this.responses = new LinkedBlockingQueue<>();
    this.responseFutureMap = new HashMap<>();

    // maps "localhost:8983|localhost:7574" to a shuffled
    // List("http://localhost:8983","http://localhost:7574")
    // This is primarily to keep track of what order we should use to query the replicas of a shard
    // so that we use the same replica for all phases of a distributed request.
    shardToURLs = new HashMap<>();
  }

  private static class SimpleSolrResponse extends SolrResponse {

    volatile long elapsedTime;

    volatile NamedList nl;

    @Override
    public long getElapsedTime() {
      return elapsedTime;
    }

    @Override
    public NamedList getResponse() {
      return nl;
    }

    @Override
    public void setResponse(NamedList rsp) {
      nl = rsp;
    }

    @Override
    public void setElapsedTime(long elapsedTime) {
      this.elapsedTime = elapsedTime;
    }
  }

  // Not thread safe... don't use in Callable.
  // Don't modify the returned URL list.
  private List getURLs(String shard) {
    List urls = shardToURLs.get(shard);
    if (urls == null) {
      urls = httpShardHandlerFactory.buildURLList(shard);
      shardToURLs.put(shard, urls);
    }
    return urls;
  }

  @Override
  public void submit(
      final ShardRequest sreq, final String shard, final ModifiableSolrParams params) {
    // do this outside of the callable for thread safety reasons
    final List urls = getURLs(shard);
    params.remove(CommonParams.WT); // use default (currently javabin)
    params.remove(CommonParams.VERSION);
    QueryRequest req = makeQueryRequest(sreq, params, shard);
    req.setMethod(SolrRequest.METHOD.POST);

    LBSolrClient.Req lbReq = httpShardHandlerFactory.newLBHttpSolrClientReq(req, urls);

    ShardResponse srsp = new ShardResponse();
    if (sreq.nodeName != null) {
      srsp.setNodeName(sreq.nodeName);
    }
    srsp.setShardRequest(sreq);
    srsp.setShard(shard);
    SimpleSolrResponse ssr = new SimpleSolrResponse();
    srsp.setSolrResponse(ssr);

    pending.incrementAndGet();
    // if there are no shards available for a slice, urls.size()==0
    if (urls.isEmpty()) {
      // TODO: what's the right error code here? We should use the same thing when
      // all of the servers for a shard are down.
      SolrException exception =
          new SolrException(
              SolrException.ErrorCode.SERVICE_UNAVAILABLE, "no servers hosting shard: " + shard);
      srsp.setException(exception);
      srsp.setResponseCode(exception.code());
      responses.add(srsp);
      return;
    }

    long startTime = System.nanoTime();
    SolrRequestInfo requestInfo = SolrRequestInfo.getRequestInfo();
    if (requestInfo != null) {
      req.setUserPrincipal(requestInfo.getReq().getUserPrincipal());
    }

    CompletableFuture future = this.lbClient.requestAsync(lbReq);
    future.whenComplete(
        (rsp, throwable) -> {
          if (rsp != null) {
            ssr.nl = rsp.getResponse();
            srsp.setShardAddress(rsp.getServer());
            ssr.elapsedTime =
                TimeUnit.MILLISECONDS.convert(System.nanoTime() - startTime, TimeUnit.NANOSECONDS);
            responses.add(srsp);
          } else if (throwable != null) {
            ssr.elapsedTime =
                TimeUnit.MILLISECONDS.convert(System.nanoTime() - startTime, TimeUnit.NANOSECONDS);
            srsp.setException(throwable);
            if (throwable instanceof SolrException) {
              srsp.setResponseCode(((SolrException) throwable).code());
            }
            responses.add(srsp);
          }
        });

    responseFutureMap.put(srsp, future);
  }

  /** Subclasses could modify the request based on the shard */
  protected QueryRequest makeQueryRequest(
      final ShardRequest sreq, ModifiableSolrParams params, String shard) {
    // use generic request to avoid extra processing of queries
    return new QueryRequest(params);
  }

  /** Subclasses could modify the Response based on the shard */
  protected ShardResponse transfomResponse(
      final ShardRequest sreq, ShardResponse rsp, String shard) {
    return rsp;
  }

  /**
   * returns a ShardResponse of the last response correlated with a ShardRequest. This won't return
   * early if it runs into an error.
   */
  @Override
  public ShardResponse takeCompletedIncludingErrors() {
    return take(false);
  }

  /**
   * returns a ShardResponse of the last response correlated with a ShardRequest, or immediately
   * returns a ShardResponse if there was an error detected
   */
  @Override
  public ShardResponse takeCompletedOrError() {
    return take(true);
  }

  private ShardResponse take(boolean bailOnError) {
    try {
      while (pending.get() > 0) {
        ShardResponse rsp = responses.take();
        responseFutureMap.remove(rsp);

        pending.decrementAndGet();
        if (bailOnError && rsp.getException() != null)
          return rsp; // if exception, return immediately
        // add response to the response list... we do this after the take() and
        // not after the completion of "call" so we know when the last response
        // for a request was received.  Otherwise we might return the same
        // request more than once.
        rsp.getShardRequest().responses.add(rsp);
        if (rsp.getShardRequest().responses.size() == rsp.getShardRequest().actualShards.length) {
          return rsp;
        }
      }
    } catch (InterruptedException e) {
      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
    }
    return null;
  }

  @Override
  public void cancelAll() {
    for (CompletableFuture future : responseFutureMap.values()) {
      future.cancel(true);
      pending.decrementAndGet();
    }
    responseFutureMap.clear();
  }

  @Override
  public void prepDistributed(ResponseBuilder rb) {
    final SolrQueryRequest req = rb.req;
    final SolrParams params = req.getParams();
    final String shards = params.get(ShardParams.SHARDS);

    CoreDescriptor coreDescriptor = req.getCore().getCoreDescriptor();
    CloudDescriptor cloudDescriptor = req.getCloudDescriptor();
    ZkController zkController = req.getCoreContainer().getZkController();

    final ReplicaListTransformer replicaListTransformer =
        httpShardHandlerFactory.getReplicaListTransformer(req);

    AllowListUrlChecker urlChecker = req.getCoreContainer().getAllowListUrlChecker();
    if (shards != null
        && zkController == null
        && urlChecker.isEnabled()
        && !urlChecker.hasExplicitAllowList()) {
      throw new SolrException(
          SolrException.ErrorCode.FORBIDDEN,
          "solr.xml property '"
              + AllowListUrlChecker.URL_ALLOW_LIST
              + "' not configured but required (in lieu of ZkController and ClusterState) when using the '"
              + ShardParams.SHARDS
              + "' parameter. "
              + AllowListUrlChecker.SET_SOLR_DISABLE_URL_ALLOW_LIST_CLUE);
    }

    ReplicaSource replicaSource;
    if (zkController != null) {
      boolean onlyNrt = Boolean.TRUE == req.getContext().get(ONLY_NRT_REPLICAS);

      replicaSource =
          new CloudReplicaSource.Builder()
              .params(params)
              .zkStateReader(zkController.getZkStateReader())
              .allowListUrlChecker(urlChecker)
              .replicaListTransformer(replicaListTransformer)
              .collection(cloudDescriptor.getCollectionName())
              .onlyNrt(onlyNrt)
              .build();
      rb.slices = replicaSource.getSliceNames().toArray(new String[replicaSource.getSliceCount()]);

      if (canShortCircuit(rb.slices, onlyNrt, params, cloudDescriptor)) {
        rb.isDistrib = false;
        rb.shortCircuitedURL =
            ZkCoreNodeProps.getCoreUrl(zkController.getBaseUrl(), coreDescriptor.getName());
        return;
        // We shouldn't need to do anything to handle "shard.rows" since it was previously meant to
        // be an optimization?
      }

      if (!ShardParams.getShardsTolerantAsBool(params)) {
        for (int i = 0; i < rb.slices.length; i++) {
          if (replicaSource.getReplicasBySlice(i).isEmpty()) {
            final ReplicaSource allActiveReplicaSource =
                new CloudReplicaSource.Builder()
                    .params(params)
                    .zkStateReader(zkController.getZkStateReader())
                    .allowListUrlChecker(AllowListUrlChecker.ALLOW_ALL)
                    .replicaListTransformer(NoOpReplicaListTransformer.INSTANCE)
                    .collection(cloudDescriptor.getCollectionName())
                    .onlyNrt(false)
                    .build();
            final String adjective =
                (allActiveReplicaSource.getReplicasBySlice(i).isEmpty() ? "active" : "eligible");
            // stop the check when there are no replicas available for a shard
            // todo fix use of slices[i] which can be null if user specified urls in shards param
            throw new SolrException(
                SolrException.ErrorCode.SERVICE_UNAVAILABLE,
                "no " + adjective + " servers hosting shard: " + rb.slices[i]);
          }
        }
      }
    } else {
      replicaSource =
          new StandaloneReplicaSource.Builder()
              .allowListUrlChecker(urlChecker)
              .shards(shards)
              .build();
      rb.slices = new String[replicaSource.getSliceCount()];
    }

    rb.shards = new String[rb.slices.length];
    for (int i = 0; i < rb.slices.length; i++) {
      rb.shards[i] = createSliceShardsStr(replicaSource.getReplicasBySlice(i));
    }

    String shards_rows = params.get(ShardParams.SHARDS_ROWS);
    if (shards_rows != null) {
      rb.shards_rows = Integer.parseInt(shards_rows);
    }
    String shards_start = params.get(ShardParams.SHARDS_START);
    if (shards_start != null) {
      rb.shards_start = Integer.parseInt(shards_start);
    }
  }

  private static String createSliceShardsStr(final List shardUrls) {
    return String.join("|", shardUrls);
  }

  private boolean canShortCircuit(
      String[] slices,
      boolean onlyNrtReplicas,
      SolrParams params,
      CloudDescriptor cloudDescriptor) {
    // Are we hosting the shard that this request is for, and are we active? If so, then handle it
    // ourselves and make it a non-distributed request.
    String ourSlice = cloudDescriptor.getShardId();
    String ourCollection = cloudDescriptor.getCollectionName();
    // Some requests may only be fulfilled by replicas of type Replica.Type.NRT
    if (slices.length == 1
        && slices[0] != null
        && (slices[0].equals(ourSlice)
            || slices[0].equals(
                ourCollection + "_" + ourSlice)) // handle the _ format
        && cloudDescriptor.getLastPublished() == Replica.State.ACTIVE
        && (!onlyNrtReplicas || cloudDescriptor.getReplicaType() == Replica.Type.NRT)) {
      // currently just a debugging parameter to check distrib search on a single node
      boolean shortCircuit = params.getBool("shortCircuit", true);

      String targetHandler = params.get(ShardParams.SHARDS_QT);
      // if a different handler is specified, don't short-circuit
      shortCircuit = shortCircuit && targetHandler == null;

      return shortCircuit;
    }
    return false;
  }

  @Override
  public ShardHandlerFactory getShardHandlerFactory() {
    return httpShardHandlerFactory;
  }
}
 















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