code: /*
   * 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.skywalking.oap.server.library.util.prometheus.parser;
  
  import org.apache.skywalking.oap.server.library.util.ResourceUtils;
  import org.apache.skywalking.oap.server.library.util.prometheus.metrics.Counter;
  import org.apache.skywalking.oap.server.library.util.prometheus.metrics.Histogram;
  import org.apache.skywalking.oap.server.library.util.prometheus.metrics.MetricFamily;
  import org.apache.skywalking.oap.server.library.util.prometheus.metrics.MetricType;
  import org.apache.skywalking.oap.server.library.util.prometheus.metrics.Summary;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.LinkedList;
  import java.util.Queue;
  
  import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class TextParserTest {
  
      Queue<MetricFamily> expectedMfs = new LinkedList<>();
  
      long now;
  
      @BeforeEach
      public void setup() {
          now = System.currentTimeMillis();
          expectedMfs.offer(new MetricFamily.Builder()
              .setName("http_requests_total")
                                .setType(MetricType.COUNTER)
                                .setHelp("The total number of HTTP requests.")
                                .addMetric(Counter.builder()
                                                  .name("http_requests_total")
                                                  .label("method", "post")
                                                  .label("code", "200")
                                                  .value(1027D)
                                                  .timestamp(now)
                                                  .build())
                                .addMetric(Counter.builder()
                                                  .name("http_requests_total")
                                                  .label("method", "post")
                                                  .label("code", "400")
                                                  .value(3D)
                                                  .timestamp(now)
                                                  .build())
                                .build());
          expectedMfs.offer(new MetricFamily.Builder()
                                .setName("http_request_duration_seconds")
                                .setType(MetricType.HISTOGRAM)
                                .setHelp("A histogram of the request duration.")
                                .addMetric(Histogram.builder()
                                                     .name("http_request_duration_seconds")
                                                     .label("status", "400")
                                                     .sampleCount(55)
                                                     .sampleSum(12D)
                                                     .bucket(0.05D, 20L)
                                                     .bucket(0.1D, 20L)
                                                     .bucket(0.2D, 20L)
                                                     .bucket(0.5D, 25L)
                                                     .bucket(1.0D, 30L)
                                                     .bucket(Double.POSITIVE_INFINITY, 30L)
                                                     .timestamp(now)
                                                     .build())
                                .addMetric(Histogram.builder()
                                                    .name("http_request_duration_seconds")
                                                    .label("status", "200")
                                                    .sampleCount(144320L)
                                                    .sampleSum(53423.0D)
                                                    .bucket(0.05D, 24054L)
                                                    .bucket(0.1D, 33444L)
                                                    .bucket(0.2D, 100392L)
                                                    .bucket(0.5D, 129389L)
                                                    .bucket(1.0D, 133988L)
                                                    .bucket(Double.POSITIVE_INFINITY, 144320L)
                                                    .timestamp(now)
                                                    .build())
                                .build());
          expectedMfs.offer(new MetricFamily.Builder()
                                .setName("rpc_duration_seconds")
                                .setType(MetricType.SUMMARY)
                                .setHelp("A summary of the RPC duration in seconds.")
                                .addMetric(Summary.builder()
                                               .name("rpc_duration_seconds")
                                               .sampleCount(2693L)
                                               .sampleSum(1.7560473E7D)
                                               .quantile(0.01D, 3102D)
                                               .quantile(0.05D, 3272D)
                                               .quantile(0.5D, 4773D)
                                               .quantile(0.9D, 9001D)
                                               .quantile(0.99D, 76656D)
                                               .timestamp(now)
                                               .build())
                                .build());
      }
  
      @Test
      public void parseTextSuccessfully() throws IOException {
          try (InputStream is = ResourceUtils.readToStream("testdata/prometheus.txt")) {
              TextParser parser = new TextParser(is);
              MetricFamily mf;
              int mfNum = 0;
              while ((mf = parser.parse(now)) != null) {
                  mfNum++;
                  MetricFamily expected = expectedMfs.poll();
                  assertNotNull(expected);
                  assertThat(mf).isEqualTo(expected);
              }
              assertThat(mfNum).isEqualTo(3);
          }
      }
  }
  