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GRPC lucene server using near-real-time replication

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/*
 * Copyright 2020 Yelp 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.yelp.nrtsearch.server;

import com.google.api.HttpBody;
import com.google.protobuf.ByteString;
import io.prometheus.client.CollectorRegistry;
import io.prometheus.client.exporter.common.TextFormat;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;

public class MetricsRequestHandler {
  private final CollectorRegistry collectorRegistry;

  public MetricsRequestHandler(CollectorRegistry collectorRegistry) {
    this.collectorRegistry = collectorRegistry;
  }

  public HttpBody process() throws IOException {
    try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(byteArrayOutputStream);
        Writer writer = new BufferedWriter(outputStreamWriter)) {
      TextFormat.write004(writer, collectorRegistry.metricFamilySamples());
      writer.flush();
      return HttpBody.newBuilder()
          .setContentType("text/plain")
          .setData(ByteString.copyFrom(byteArrayOutputStream.toByteArray()))
          .build();
    }
  }
}