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package com.yahoo.container.handler.metrics;
import com.github.tomakehurst.wiremock.junit.WireMockRule;
import com.yahoo.container.jdisc.RequestHandlerTestDriver;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
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.urlEqualTo;
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.PrometheusV1Handler.consumerQuery;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class PrometheusV1HandlerTest {
private static final String URI_BASE = "http://localhost";
private static final String V1_URI = URI_BASE + PrometheusV1Handler.V1_PATH;
private static final String VALUES_URI = URI_BASE + PrometheusV1Handler.VALUES_PATH;
// Mock applicationmetrics api
private static final String MOCK_METRICS_PATH = "/node0";
private static final String TEST_FILE = "application-prometheus.txt";
private static final String RESPONSE = getFileContents(TEST_FILE);
private static final String CPU_METRIC = "cpu";
private static final String REPLACED_CPU_METRIC = "cpu.util";
private static final String CUSTOM_CONSUMER = "custom-consumer";
private static RequestHandlerTestDriver testDriver;
@Rule
public WireMockRule wireMockRule = new WireMockRule(80);
@Before
public void setup() {
setupWireMock();
var handler = new PrometheusV1Handler(Executors.newSingleThreadExecutor(),
new MetricsProxyApiConfig.Builder()
.metricsPort(wireMockRule.port())
.metricsApiPath(MOCK_METRICS_PATH)
.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)));
// wireMockRule.stubFor(get(urlEqualTo("/prometheus/v1/values"))
// .willReturn(aResponse()
// .withStatus(200)
// .withHeader("Content-Type", "text/plain")
// .withBody(RESPONSE)));
}
@Test
public void v1_response_contains_values_uri() throws Exception {
String response = testDriver.sendRequest(V1_URI).readAll();
JSONObject root = new JSONObject(response);
assertTrue(root.has("resources"));
JSONArray resources = root.getJSONArray("resources");
assertEquals(1, resources.length());
JSONObject valuesUri = resources.getJSONObject(0);
assertEquals(VALUES_URI, valuesUri.getString("url"));
}
@Test
public void invalid_path_yields_error_response() throws Exception {
String response = testDriver.sendRequest(V1_URI + "/invalid").readAll();
JSONObject root = new JSONObject(response);
assertTrue(root.has("error"));
assertTrue(root.getString("error").startsWith("No content"));
}
@Test
public void values_response_is_equal_to_test_file() {
String response = testDriver.sendRequest(VALUES_URI).readAll();
assertEquals(RESPONSE, response);
}
@Test
public void consumer_is_propagated_to_metrics_proxy_api() throws JSONException {
String response = getResponseAsString(CUSTOM_CONSUMER);
assertTrue(response.contains(REPLACED_CPU_METRIC));
}
private String getResponseAsString(String consumer) {
return testDriver.sendRequest(VALUES_URI + consumerQuery(consumer)).readAll();
}
private static String getFileContents(String filename) {
InputStream in = PrometheusV1HandlerTest.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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