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From zentol <...@git.apache.org>
Subject [GitHub] flink pull request #3833: [FLINK-6221] Add PrometheusReporter
Date Sat, 13 May 2017 22:57:36 GMT
Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3833#discussion_r116368667
  
    --- Diff: flink-metrics/flink-metrics-prometheus/src/test/java/org/apache/flink/metrics/prometheus/PrometheusReporterTest.java
---
    @@ -0,0 +1,192 @@
    +/*
    + * 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.flink.metrics.prometheus;
    +
    +import com.mashape.unirest.http.HttpResponse;
    +import com.mashape.unirest.http.Unirest;
    +import com.mashape.unirest.http.exceptions.UnirestException;
    +import org.apache.flink.configuration.ConfigConstants;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.configuration.MetricOptions;
    +import org.apache.flink.metrics.Counter;
    +import org.apache.flink.metrics.Gauge;
    +import org.apache.flink.metrics.Histogram;
    +import org.apache.flink.metrics.Meter;
    +import org.apache.flink.metrics.Metric;
    +import org.apache.flink.metrics.SimpleCounter;
    +import org.apache.flink.metrics.reporter.MetricReporter;
    +import org.apache.flink.metrics.util.TestMeter;
    +import org.apache.flink.runtime.metrics.MetricRegistry;
    +import org.apache.flink.runtime.metrics.MetricRegistryConfiguration;
    +import org.apache.flink.runtime.metrics.groups.FrontMetricGroup;
    +import org.apache.flink.runtime.metrics.groups.TaskManagerMetricGroup;
    +import org.apache.flink.runtime.metrics.util.TestingHistogram;
    +import org.apache.flink.util.TestLogger;
    +import org.junit.After;
    +import org.junit.Rule;
    +import org.junit.Test;
    +import org.junit.rules.ExpectedException;
    +
    +import java.util.Arrays;
    +
    +import static org.apache.flink.metrics.prometheus.PrometheusReporter.ARG_PORT;
    +import static org.apache.flink.runtime.metrics.scope.ScopeFormat.SCOPE_SEPARATOR;
    +import static org.hamcrest.Matchers.both;
    +import static org.hamcrest.Matchers.containsString;
    +import static org.hamcrest.Matchers.equalTo;
    +import static org.junit.Assert.assertThat;
    +
    +public class PrometheusReporterTest extends TestLogger {
    +	private static final int NON_DEFAULT_PORT = 9429;
    +
    +	private static final String HOST_NAME    = "hostname";
    +	private static final String TASK_MANAGER = "tm";
    +
    +	private static final String HELP_PREFIX    = "# HELP ";
    +	private static final String TYPE_PREFIX    = "# TYPE ";
    +	private static final String DIMENSIONS     = "host=\"" + HOST_NAME + "\",tm_id=\"" +
TASK_MANAGER + "\"";
    +	private static final String DEFAULT_LABELS = "{" + DIMENSIONS + ",}";
    +	private static final String SCOPE_PREFIX   = "taskmanager_";
    +
    +	@Rule
    +	public ExpectedException thrown = ExpectedException.none();
    +
    +	private MetricRegistry registry = prepareMetricRegistry();
    +
    +	private final MetricReporter reporter = registry.getReporters().get(0);
    +
    +	@Test
    +	public void counterIsReportedAsPrometheusGauge() throws UnirestException {
    +		//Prometheus counters may not decrease
    +		Counter testCounter = new SimpleCounter();
    +		testCounter.inc(7);
    +
    +		String counterName = "testCounter";
    +		String gaugeName = SCOPE_PREFIX + counterName;
    +
    +		assertThat(addMetricAndPollResponse(testCounter, counterName),
    +			containsString(HELP_PREFIX + gaugeName + " " + getFullMetricName(counterName) + "\n"
+
    +						   TYPE_PREFIX + gaugeName + " gauge" + "\n" +
    +						   gaugeName + DEFAULT_LABELS + " 7.0"));
    +	}
    +
    +	@Test
    +	public void gaugeIsReportedAsPrometheusGauge() throws UnirestException {
    +		Gauge<Integer> testGauge = new Gauge<Integer>() {
    +			@Override
    +			public Integer getValue() {
    +				return 1;
    +			}
    +		};
    +
    +		String gaugeName = "testGauge";
    +		String prometheusGaugeName = SCOPE_PREFIX + gaugeName;
    +
    +		assertThat(addMetricAndPollResponse(testGauge, gaugeName),
    +			containsString(HELP_PREFIX + prometheusGaugeName + " " + getFullMetricName(gaugeName)
+ "\n" +
    +						   TYPE_PREFIX + prometheusGaugeName + " gauge" + "\n" +
    +						   prometheusGaugeName + DEFAULT_LABELS + " 1.0"));
    +	}
    +
    +	@Test
    +	public void histogramIsReportedAsPrometheusSummary() throws UnirestException {
    +		Histogram testHistogram = new TestingHistogram();
    +
    +		String histogramName = "testHistogram";
    +		String summaryName = SCOPE_PREFIX + histogramName;
    +
    +		String response = addMetricAndPollResponse(testHistogram, histogramName);
    +		assertThat(response, both(containsString(HELP_PREFIX + summaryName + " " + getFullMetricName(histogramName)
+ "\n" +
    +												 TYPE_PREFIX + summaryName + " summary" + "\n"))
    +			.and(containsString(summaryName + "_count" + DEFAULT_LABELS + " 1.0")));
    +		for (String quantile : Arrays.asList("0.5", "0.75", "0.95", "0.98", "0.99", "0.999"))
{
    +			assertThat(response, containsString(
    +				summaryName + "{" + DIMENSIONS + ",quantile=\"" + quantile + "\",} " + quantile));
    +		}
    +	}
    +
    +	@Test
    +	public void meterTotalIsReportedAsPrometheusCounter() throws UnirestException {
    +		Meter testMeter = new TestMeter();
    +
    +		String meterName = "testMeter";
    +		String counterName = SCOPE_PREFIX + meterName + "_total";
    +
    +		assertThat(addMetricAndPollResponse(testMeter, meterName),
    +			containsString(HELP_PREFIX + counterName + " " + getFullMetricName(meterName) + "\n"
+
    +						   TYPE_PREFIX + counterName + " counter" + "\n" +
    +						   counterName + DEFAULT_LABELS + " 100.0"));
    +	}
    +
    +	@Test
    +	public void endpointIsUnavailableAfterReporterIsClosed() throws UnirestException {
    +		reporter.close();
    +		thrown.expect(UnirestException.class);
    +		pollMetrics();
    +	}
    +
    +	@Test
    +	public void invalidCharactersAreReplacedWithUnderscore() {
    +		assertThat(PrometheusReporter.replaceInvalidChars(""), equalTo(""));
    +		assertThat(PrometheusReporter.replaceInvalidChars("abc"), equalTo("abc"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("abc\""), equalTo("abc_"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("\"abc"), equalTo("_abc"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("\"abc\""), equalTo("_abc_"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("\"a\"b\"c\""), equalTo("_a_b_c_"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("\"\"\"\""), equalTo("____"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("    "), equalTo("____"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("\"ab ;(c)'"), equalTo("_ab___c__"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("a b c"), equalTo("a_b_c"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("a b c "), equalTo("a_b_c_"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("a;b'c*"), equalTo("a_b_c_"));
    +		assertThat(PrometheusReporter.replaceInvalidChars("a,=;:?'b,=;:?'c"), equalTo("a___:__b___:__c"));
    +	}
    +
    +	private String addMetricAndPollResponse(Metric metric, String metricName) throws UnirestException
{
    +		reporter.notifyOfAddedMetric(metric, metricName, new FrontMetricGroup<>(0, new
TaskManagerMetricGroup(registry, HOST_NAME, TASK_MANAGER)));
    +		return pollMetrics().getBody();
    +	}
    +
    +	private static HttpResponse<String> pollMetrics() throws UnirestException {
    +		return Unirest.get("http://localhost:" + NON_DEFAULT_PORT + "/metrics").asString();
    +	}
    +
    +	private static String getFullMetricName(String metricName) {
    +		return HOST_NAME + SCOPE_SEPARATOR + "taskmanager" + SCOPE_SEPARATOR + TASK_MANAGER
+ SCOPE_SEPARATOR + metricName;
    +	}
    +
    +	private static MetricRegistry prepareMetricRegistry() {
    --- End diff --
    
    This method is a bit overkill for a one-liner that is called once.


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