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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.vespa.service.health;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.logging.Level;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.net.URL;
import java.time.Duration;
import java.util.function.Function;
import java.util.logging.Logger;
import static com.yahoo.yolean.Exceptions.uncheck;
/**
* A thread-unsafe /state/v1/health endpoint client.
*
* @author hakonhall
*/
public class StateV1HealthClient implements AutoCloseable {
private static final long MAX_CONTENT_LENGTH = 1L << 20; // 1 MB
private static final ObjectMapper MAPPER = new ObjectMapper();
private static final Logger logger = Logger.getLogger(StateV1HealthClient.class.getName());
private final ApacheHttpClient httpClient;
private final Function<HttpEntity, String> getContentFunction;
StateV1HealthClient(URL url, Duration requestTimeout, Duration connectionKeepAlive) {
this(new ApacheHttpClient(url, requestTimeout, connectionKeepAlive),
entity -> uncheck(() -> EntityUtils.toString(entity)));
}
StateV1HealthClient(ApacheHttpClient apacheHttpClient, Function<HttpEntity, String> getContentFunction) {
httpClient = apacheHttpClient;
this.getContentFunction = getContentFunction;
}
HealthInfo get() throws Exception {
return httpClient.get(this::handle);
}
private HealthInfo handle(CloseableHttpResponse httpResponse) throws IOException {
int httpStatusCode = httpResponse.getStatusLine().getStatusCode();
if (httpStatusCode < 200 || httpStatusCode >= 300) {
return HealthInfo.fromBadHttpStatusCode(httpStatusCode);
}
HttpEntity bodyEntity = httpResponse.getEntity();
long contentLength = bodyEntity.getContentLength();
if (contentLength > MAX_CONTENT_LENGTH) {
throw new IllegalArgumentException("Content too long: " + contentLength + " bytes");
}
String body = getContentFunction.apply(bodyEntity);
HealthResponse healthResponse = MAPPER.readValue(body, HealthResponse.class);
if (healthResponse.status == null || healthResponse.status.code == null) {
return HealthInfo.fromHealthStatusCode(HealthResponse.Status.DEFAULT_STATUS);
} else {
return HealthInfo.fromHealthStatusCode(healthResponse.status.code);
}
}
@Override
public void close() {
try {
httpClient.close();
} catch (Exception e) {
logger.log(Level.WARNING, "Failed to close CloseableHttpClient", e);
}
}
}
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