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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.http.application;
import com.github.tomakehurst.wiremock.junit.WireMockRule;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import java.time.Duration;
import java.util.Arrays;
import static ai.vespa.metricsproxy.TestUtil.getFileContents;
import static ai.vespa.metricsproxy.http.application.ApplicationMetricsRetriever.MAX_TIMEOUT;
import static ai.vespa.metricsproxy.http.application.ApplicationMetricsRetriever.MIN_TIMEOUT;
import static ai.vespa.metricsproxy.http.application.ApplicationMetricsRetriever.timeout;
import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
import static com.github.tomakehurst.wiremock.client.WireMock.get;
import static com.github.tomakehurst.wiremock.client.WireMock.urlPathEqualTo;
import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.options;
import static java.util.stream.Collectors.toList;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* @author gjoranv
*/
public class ApplicationMetricsRetrieverTest {
private static final String TEST_FILE = "generic-sample.json";
private static final String RESPONSE = getFileContents(TEST_FILE);
private static final String HOST = "localhost";
private static int port;
@Rule
public WireMockRule wireMockRule = new WireMockRule(options().dynamicPort(), false);
@Before
public void setup() {
port = wireMockRule.port();
}
@Test
public void metrics_can_be_retrieved() {
var config = nodesConfig("/node0");
Node node = new Node(config.node(0));
verifyRetrievingMetricsFromSingleNode(config, node);
}
private void verifyRetrievingMetricsFromSingleNode(MetricsNodesConfig config, Node node) {
wireMockRule.stubFor(get(urlPathEqualTo(config.node(0).metricsPath()))
.willReturn(aResponse().withBody(RESPONSE)));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
retriever.getMetrics();
retriever.startPollAndWait();
var metricsByNode = retriever.getMetrics();
assertEquals(1, metricsByNode.size());
assertEquals(4, metricsByNode.get(node).size());
}
@Test
public void metrics_can_be_retrieved_from_multiple_nodes() {
var config = nodesConfig("/node0", "/node1");
Node node0 = new Node(config.node(0));
Node node1 = new Node(config.node(1));
wireMockRule.stubFor(get(urlPathEqualTo(config.node(0).metricsPath()))
.willReturn(aResponse().withBody(RESPONSE)));
wireMockRule.stubFor(get(urlPathEqualTo(config.node(1).metricsPath()))
.willReturn(aResponse().withBody(RESPONSE)));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
retriever.getMetrics();
retriever.startPollAndWait();
var metricsByNode = retriever.getMetrics();
assertEquals(2, metricsByNode.size());
assertEquals(4, metricsByNode.get(node0).size());
assertEquals(4, metricsByNode.get(node1).size());
}
@Test
public void dead_node_yields_empty_metrics() {
var config = nodesConfig("/non-existent");
Node node = new Node(config.node(0));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
var metricsByNode = retriever.getMetrics();
assertEquals(1, metricsByNode.size());
assertEquals(0, metricsByNode.get(node).size());
}
@Test
public void metrics_from_good_node_are_returned_even_if_another_node_is_dead() {
var config = nodesConfig("/node0", "/node1");
Node node0 = new Node(config.node(0));
Node node1 = new Node(config.node(1));
wireMockRule.stubFor(get(urlPathEqualTo(config.node(1).metricsPath()))
.willReturn(aResponse().withBody(RESPONSE)));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
retriever.getMetrics();
retriever.startPollAndWait();
var metricsByNode = retriever.getMetrics();
assertEquals(2, metricsByNode.size());
assertEquals(0, metricsByNode.get(node0).size());
assertEquals(4, metricsByNode.get(node1).size());
}
@Test
public void an_exception_is_thrown_when_retrieving_times_out() {
var config = nodesConfig("/node0");
Node node = new Node(config.node(0));
wireMockRule.stubFor(get(urlPathEqualTo(config.node(0).metricsPath()))
.willReturn(aResponse()
.withBody(RESPONSE)
.withFixedDelay(10)));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
retriever.setTaskTimeout(Duration.ofMillis(1));
retriever.startPollAndWait();
assertTrue(retriever.getMetrics().get(node).isEmpty());
}
@Test
public void metrics_can_be_retrieved_after_previous_call_threw_an_exception() {
var config = nodesConfig("/node0");
Node node = new Node(config.node(0));
var delayedStub = wireMockRule.stubFor(get(urlPathEqualTo(config.node(0).metricsPath()))
.willReturn(aResponse()
.withBody(RESPONSE)
.withFixedDelay(10)));
ApplicationMetricsRetriever retriever = new ApplicationMetricsRetriever(config);
retriever.getMetrics();
retriever.setTaskTimeout(Duration.ofMillis(1));
retriever.startPollAndWait();
assertTrue(retriever.getMetrics().get(node).isEmpty());
// Verify successful retrieving
wireMockRule.removeStubMapping(delayedStub);
verifyRetrievingMetricsFromSingleNode(config, node);
}
@Test
public void test_timeout_calculation() {
assertEquals(MIN_TIMEOUT, timeout(1));
assertEquals(MIN_TIMEOUT, timeout(20));
// These values must be updated if the calculation in the timeout method itself is changed.
assertEquals(Duration.ofSeconds(100), timeout(100));
assertEquals(Duration.ofSeconds(200), timeout(200));
assertEquals(MAX_TIMEOUT, timeout(240));
}
private MetricsNodesConfig nodesConfig(String... paths) {
var nodes = Arrays.stream(paths)
.map(this::nodeConfig)
.collect(toList());
return new MetricsNodesConfig.Builder()
.node(nodes)
.build();
}
private MetricsNodesConfig.Node.Builder nodeConfig(String path) {
return new MetricsNodesConfig.Node.Builder()
.role(path)
.hostname(HOST)
.metricsPath(path)
.metricsPort(port);
}
}
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