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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.service.monitor.internal.health;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.ConnectionKeepAliveStrategy;
import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.BasicHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import java.util.function.Function;
import static com.yahoo.yolean.Exceptions.uncheck;
/**
* Health client
*
* NOT thread-safe.
*
* @author hakon
*/
public class HealthClient implements AutoCloseable {
private static final ObjectMapper mapper = new ObjectMapper();
private static final long MAX_CONTENT_LENGTH = 1L << 20; // 1 MB
private static final int DEFAULT_TIMEOUT_MILLIS = 1_000;
private static final ConnectionKeepAliveStrategy KEEP_ALIVE_STRATEGY =
new DefaultConnectionKeepAliveStrategy() {
@Override
public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
long keepAlive = super.getKeepAliveDuration(response, context);
if (keepAlive == -1) {
// Keep connections alive 60 seconds if a keep-alive value
// has not be explicitly set by the server
keepAlive = 60000;
}
return keepAlive;
}
};
private final HealthEndpoint endpoint;
private final CloseableHttpClient httpClient;
private final Function<HttpEntity, String> getContentFunction;
public HealthClient(HealthEndpoint endpoint) {
this(endpoint,
makeCloseableHttpClient(endpoint),
entity -> uncheck(() -> EntityUtils.toString(entity)));
}
/** For testing. */
HealthClient(HealthEndpoint endpoint,
CloseableHttpClient httpClient,
Function<HttpEntity, String> getContentFunction) {
this.endpoint = endpoint;
this.httpClient = httpClient;
this.getContentFunction = getContentFunction;
}
public HealthEndpoint getEndpoint() {
return endpoint;
}
public HealthInfo getHealthInfo() {
try {
return probeHealth();
} catch (Exception e) {
return HealthInfo.fromException(e);
}
}
@Override
public void close() {
try {
httpClient.close();
} catch (Exception e) {
// ignore
}
}
private static CloseableHttpClient makeCloseableHttpClient(HealthEndpoint endpoint) {
Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
.register(endpoint.getStateV1HealthUrl().getProtocol(), endpoint.getConnectionSocketFactory())
.build();
HttpClientConnectionManager connectionManager = new BasicHttpClientConnectionManager(registry);
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(DEFAULT_TIMEOUT_MILLIS) // establishment of connection
.setConnectionRequestTimeout(DEFAULT_TIMEOUT_MILLIS) // connection from connection manager
.setSocketTimeout(DEFAULT_TIMEOUT_MILLIS) // waiting for data
.build();
return HttpClients.custom()
.setKeepAliveStrategy(KEEP_ALIVE_STRATEGY)
.setConnectionManager(connectionManager)
.disableAutomaticRetries()
.setDefaultRequestConfig(requestConfig)
.build();
}
private HealthInfo probeHealth() throws Exception {
HttpGet httpget = new HttpGet(endpoint.getStateV1HealthUrl().toString());
CloseableHttpClient httpClient = this.httpClient;
if (httpClient == null) {
throw new IllegalStateException("HTTP client never started or has closed");
}
try (CloseableHttpResponse httpResponse = httpClient.execute(httpget)) {
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);
}
}
}
}
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