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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler.metrics;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.github.tomakehurst.wiremock.junit5.WireMockExtension;
import com.yahoo.container.jdisc.RequestHandlerTestDriver;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
import static com.github.tomakehurst.wiremock.client.WireMock.equalTo;
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 com.yahoo.container.handler.metrics.MetricsV2Handler.V2_PATH;
import static com.yahoo.container.handler.metrics.MetricsV2Handler.VALUES_PATH;
import static com.yahoo.container.handler.metrics.MetricsV2Handler.consumerQuery;
import static org.junit.jupiter.api.Assertions.*;
/**
* @author gjoranv
*/
public class MetricsV2HandlerTest {
private static final ObjectMapper jsonMapper = new ObjectMapper();
private static final String URI_BASE = "http://localhost";
private static final String V2_URI = URI_BASE + V2_PATH;
private static final String VALUES_URI = URI_BASE + VALUES_PATH;
// Mock applicationmetrics api
private static final String MOCK_METRICS_PATH = "/node0";
private static final String TEST_FILE = "application-metrics.json";
private static final String RESPONSE = getFileContents(TEST_FILE);
private static final String CPU_METRIC = "cpu.util";
private static final String REPLACED_CPU_METRIC = "replaced_cpu_util";
private static final String CUSTOM_CONSUMER = "custom-consumer";
private static RequestHandlerTestDriver testDriver;
@RegisterExtension
public WireMockExtension wireMockRule = WireMockExtension.newInstance().options(options().dynamicPort()).build();
@BeforeEach
public void setup() {
setupWireMock();
var handler = new MetricsV2Handler(Executors.newSingleThreadExecutor(),
new MetricsProxyApiConfig.Builder()
.metricsPort(wireMockRule.getPort())
.metricsApiPath(MOCK_METRICS_PATH)
.prometheusApiPath("Not/In/Use")
.build());
testDriver = new RequestHandlerTestDriver(handler);
}
private void setupWireMock() {
wireMockRule.stubFor(get(urlPathEqualTo(MOCK_METRICS_PATH))
.willReturn(aResponse().withBody(RESPONSE)));
// Add a slightly different response for a custom consumer.
String myConsumerResponse = RESPONSE.replaceAll(CPU_METRIC, REPLACED_CPU_METRIC);
wireMockRule.stubFor(get(urlPathEqualTo(MOCK_METRICS_PATH))
.withQueryParam("consumer", equalTo(CUSTOM_CONSUMER))
.willReturn(aResponse().withBody(myConsumerResponse)));
}
@Test
void v2_response_contains_values_uri() throws Exception {
String response = testDriver.sendRequest(V2_URI).readAll();
JsonNode root = jsonMapper.readTree(response);
assertTrue(root.has("resources"));
ArrayNode resources = (ArrayNode) root.get("resources");
assertEquals(1, resources.size());
JsonNode valuesUri = resources.get(0);
assertEquals(VALUES_URI, valuesUri.get("url").textValue());
}
@Disabled
@Test
void visually_inspect_values_response() {
JsonNode responseJson = getResponseAsJson(null);
System.out.println(responseJson);
}
@Test
void invalid_path_yields_error_response() throws Exception {
String response = testDriver.sendRequest(V2_URI + "/invalid").readAll();
JsonNode root = jsonMapper.readTree(response);
assertTrue(root.has("error"));
assertTrue(root.get("error").textValue().startsWith("No content"));
}
@Test
void values_response_is_equal_to_test_file() {
String response = testDriver.sendRequest(VALUES_URI).readAll();
assertEquals(RESPONSE, response);
}
@Test
void consumer_is_propagated_to_metrics_proxy_api() {
JsonNode responseJson = getResponseAsJson(CUSTOM_CONSUMER);
JsonNode firstNodeMetricsValues =
responseJson.get("nodes").get(0)
.get("node")
.get("metrics").get(0)
.get("values");
assertTrue(firstNodeMetricsValues.has(REPLACED_CPU_METRIC));
}
private JsonNode getResponseAsJson(String consumer) {
String response = testDriver.sendRequest(VALUES_URI + consumerQuery(consumer)).readAll();
try {
return jsonMapper.readTree(response);
} catch (IOException e) {
fail("Failed to create json object: " + e.getMessage());
throw new RuntimeException(e);
}
}
static String getFileContents(String filename) {
InputStream in = MetricsV2HandlerTest.class.getClassLoader().getResourceAsStream(filename);
if (in == null) {
throw new RuntimeException("File not found: " + filename);
}
return new BufferedReader(new InputStreamReader(in)).lines().collect(Collectors.joining("\n"));
}
}
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