com.couchbase.client.core.io.netty.view.ViewChunkResponseParser Maven / Gradle / Ivy

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The official Couchbase JVM Core IO Library
There is a newer version: 2.7.0
/*
 * Copyright (c) 2019 Couchbase, 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.
 */

package com.couchbase.client.core.io.netty.view;

import com.couchbase.client.core.error.CouchbaseException;
import com.couchbase.client.core.error.context.ViewErrorContext;
import com.couchbase.client.core.error.ViewNotFoundException;
import com.couchbase.client.core.io.netty.HttpProtocol;
import com.couchbase.client.core.io.netty.chunk.BaseChunkResponseParser;
import com.couchbase.client.core.json.stream.JsonStreamParser;
import com.couchbase.client.core.msg.ResponseStatus;
import com.couchbase.client.core.msg.view.ViewChunkHeader;
import com.couchbase.client.core.msg.view.ViewChunkRow;
import com.couchbase.client.core.msg.view.ViewChunkTrailer;
import com.couchbase.client.core.msg.view.ViewError;

import java.util.Optional;

/**
 * Parses the individual response http chunks for a view request.
 */
public class ViewChunkResponseParser
  extends BaseChunkResponseParser {

  /**
   * If present in non-reduce results, holds the total rows.
   */
  private long totalRows;

  /**
   * If enabled at request time, holds detailed debug information.
   */
  private Optional debug;

  /**
   * If an error happened during server request handling, will hold this error.
   */
  private Optional error;

  private final JsonStreamParser.Builder parserBuilder = JsonStreamParser.builder()
    .doOnValue("/debug_info", v -> debug = Optional.of(v.readBytes()))
    .doOnValue("/total_rows", v -> {
      markHeaderComplete();
      totalRows = v.readLong();
    })
    .doOnValue("/rows/-", v -> {
      markHeaderComplete();
      emitRow(new ViewChunkRow(v.readBytes()));
    })
    .doOnValue("/error", v -> {
      markHeaderComplete();
      String data = v.readString();

      ViewError current = error.orElse(new ViewError(null, null));
      error = Optional.of(new ViewError(data, current.reason()));
    })
    .doOnValue("/reason", v -> {
      String data = v.readString();

      ViewError current = error.orElse(new ViewError(null, null));
      error = Optional.of(new ViewError(current.error(), data));
    });

  @Override
  protected JsonStreamParser.Builder parserBuilder() {
    return parserBuilder;
  }

  @Override
  protected void doCleanup() {
    totalRows = 0;
    debug = Optional.empty();
    error = Optional.empty();
  }

  @Override
  public Optional header(boolean lastChunk) {
    return isHeaderComplete() || lastChunk
      ? Optional.of(new ViewChunkHeader(totalRows, debug))
      : Optional.empty();
  }

  @Override
  public Optional error() {
    return error.map(e -> {
      int httpStatus = responseHeader().status().code();
      ResponseStatus responseStatus = HttpProtocol.decodeStatus(responseHeader().status());
      ViewErrorContext errorContext = new ViewErrorContext(responseStatus, requestContext(), e, httpStatus);
      if (responseStatus == ResponseStatus.NOT_FOUND || e.error().equals("not_found") || e.reason().contains("not_found")) {
        return new ViewNotFoundException(errorContext);
      }
      return new CouchbaseException("Unknown view error: " + e.toString(), errorContext);
    });
  }

  @Override
  public void signalComplete() {
    Optional maybeError = error();
    if (maybeError.isPresent()) {
      failRows(maybeError.get());
    } else {
      completeRows();
    }
    completeTrailer(new ViewChunkTrailer(error));
  }

}