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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.service;
import ai.vespa.metricsproxy.metric.HealthMetric;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Fetch health status for a given vespa service
*
* @author Jo Kristian Bergum
*/
public class RemoteHealthMetricFetcher extends HttpMetricFetcher {
private static final ObjectMapper jsonMapper = new ObjectMapper();
private final static Logger log = Logger.getLogger(RemoteHealthMetricFetcher.class.getPackage().getName());
private final static String HEALTH_PATH = STATE_PATH + "health";
public RemoteHealthMetricFetcher(VespaService service, int port) {
super(service, port, HEALTH_PATH);
}
/**
* Connect to remote service over http and fetch metrics
*/
public HealthMetric getHealth(int fetchCount) {
try (CloseableHttpResponse response = getResponse()) {
HttpEntity entity = response.getEntity();
try {
return parse(new BufferedInputStream(entity.getContent(), HttpMetricFetcher.BUFFER_SIZE));
} catch (Exception e) {
handleException(e, entity.getContentType(), fetchCount);
return HealthMetric.getDown("Failed fetching status page for service");
} finally {
EntityUtils.consumeQuietly(entity);
}
} catch (IOException e) {
if (service.isAlive()) {
logMessageNoResponse(errMsgNoResponse(e), fetchCount);
}
return HealthMetric.getUnknown("Failed fetching metrics for service: " + service.getMonitoringName());
}
}
private HealthMetric parse(InputStream data) {
try {
JsonNode o = jsonMapper.readTree(data);
JsonNode status = o.get("status");
String code = status.get("code").asText();
String message = "";
if (status.has("message")) {
message = status.get("message").textValue();
}
return HealthMetric.get(code, message);
} catch (IOException e) {
log.log(Level.FINE, () -> "Failed to parse json response from metrics page:" + e + ":" + data);
return HealthMetric.getUnknown("Not able to parse json from status page");
}
}
}
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