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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.util;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHeaders;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPatch;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.Set;
/**
* Retries request on config server a few times before giving up. Assumes that all requests should be sent with
* content-type application/json
*
* @author dybdahl
*/
public class ConfigServerHttpRequestExecutor {
private static final PrefixLogger NODE_ADMIN_LOGGER = PrefixLogger.getNodeAdminLogger(ConfigServerHttpRequestExecutor.class);
private final ObjectMapper mapper = new ObjectMapper();
private final CloseableHttpClient client;
private final List<String> configServerHosts;
private final static int MAX_LOOPS = 2;
@Override
public void finalize() throws Throwable {
try {
client.close();
} catch (Exception e) {
NODE_ADMIN_LOGGER.warning("Ignoring exception thrown when closing client against " + configServerHosts, e);
}
super.finalize();
}
public static ConfigServerHttpRequestExecutor create(Set<String> configServerHosts) {
PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
// Increase max total connections to 200, which should be enough
cm.setMaxTotal(200);
return new ConfigServerHttpRequestExecutor(configServerHosts,
HttpClientBuilder.create().disableAutomaticRetries().setConnectionManager(cm).build());
}
ConfigServerHttpRequestExecutor(Set<String> configServerHosts, CloseableHttpClient client) {
this.configServerHosts = randomizeConfigServerHosts(configServerHosts);
this.client = client;
}
public interface CreateRequest {
HttpUriRequest createRequest(String configserver) throws JsonProcessingException, UnsupportedEncodingException;
}
public class NotFoundException extends RuntimeException {
private static final long serialVersionUID = 4791511887L;
public NotFoundException(String message) {
super(message);
}
}
private <T> T tryAllConfigServers(CreateRequest requestFactory, Class<T> wantedReturnType) {
Exception lastException = null;
for (int loopRetry = 0; loopRetry < MAX_LOOPS; loopRetry++) {
for (String configServer : configServerHosts) {
final CloseableHttpResponse response;
try {
response = client.execute(requestFactory.createRequest(configServer));
} catch (Exception e) {
// Failure to communicate with a config server is not abnormal, as they are
// upgraded at the same time as Docker hosts.
if (e.getMessage().indexOf("(Connection refused)") > 0) {
NODE_ADMIN_LOGGER.info("Connection refused to " + configServer + " (upgrading?), will try next");
} else {
NODE_ADMIN_LOGGER.warning("Failed to communicate with " + configServer + ", will try next: " + e.getMessage());
}
lastException = e;
continue;
}
try {
if (response.getStatusLine().getStatusCode() == Response.Status.NOT_FOUND.getStatusCode()) {
throw new NotFoundException("Not found returned from " + configServer);
}
try {
return mapper.readValue(response.getEntity().getContent(), wantedReturnType);
} catch (IOException e) {
throw new RuntimeException("Response didn't contain nodes element, failed parsing?", e);
}
} finally {
try {
response.close();
} catch (IOException e) {
NODE_ADMIN_LOGGER.warning("Ignoring exception from closing response", e);
}
}
}
}
throw new RuntimeException("All requests against the config servers ("
+ configServerHosts + ") failed, last as follows:", lastException);
}
public <T> T put(String path, int port, Optional<Object> bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPut put = new HttpPut("http://" + configServer + ":" + port + path);
setContentTypeToApplicationJson(put);
if (bodyJsonPojo.isPresent()) {
put.setEntity(new StringEntity(mapper.writeValueAsString(bodyJsonPojo.get())));
}
return put;
}, wantedReturnType);
}
public <T> T patch(String path, int port, Object bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPatch patch = new HttpPatch("http://" + configServer + ":" + port + path);
setContentTypeToApplicationJson(patch);
patch.setEntity(new StringEntity(mapper.writeValueAsString(bodyJsonPojo)));
return patch;
}, wantedReturnType);
}
public <T> T delete(String path, int port, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer ->
new HttpDelete("http://" + configServer + ":" + port + path), wantedReturnType);
}
public <T> T get(String path, int port, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer ->
new HttpGet("http://" + configServer + ":" + port + path), wantedReturnType);
}
public <T> T post(String path, int port, Object bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPost post = new HttpPost("http://" + configServer + ":" + port + path);
setContentTypeToApplicationJson(post);
post.setEntity(new StringEntity(mapper.writeValueAsString(bodyJsonPojo)));
return post;
}, wantedReturnType);
}
private void setContentTypeToApplicationJson(HttpRequestBase request) {
request.setHeader(HttpHeaders.CONTENT_TYPE, "application/json");
}
// Shuffle config server hosts to balance load
private List<String> randomizeConfigServerHosts(Set<String> configServerHosts) {
List<String> shuffledConfigServerHosts = new ArrayList<>(configServerHosts);
Collections.shuffle(shuffledConfigServerHosts);
return shuffledConfigServerHosts;
}
}
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