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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 com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.vespa.athenz.api.AthenzIdentity;
import com.yahoo.vespa.athenz.tls.AthenzIdentityVerifier;
import com.yahoo.vespa.athenz.tls.AthenzSslContextBuilder;
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.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
/**
* 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 implements AutoCloseable {
private static final PrefixLogger NODE_ADMIN_LOGGER = PrefixLogger.getNodeAdminLogger(ConfigServerHttpRequestExecutor.class);
private static final Duration CLIENT_REFRESH_INTERVAL = Duration.ofHours(1);
private final ObjectMapper mapper = new ObjectMapper();
private final ScheduledExecutorService clientRefresherScheduler =
Executors.newScheduledThreadPool(1, ThreadFactoryFactory.getDaemonThreadFactory("http-client-refresher"));
private final List<URI> configServerHosts;
/**
* The 'client' will be periodically re-created by clientRefresherScheduler if we provide keyStoreOptions
* or trustStoreOptions. This is needed because the key/trust stores are updated outside of node-admin,
* but we want to use the most recent store.
*
* The 'client' reference must be volatile because it is set and read in different threads, and visibility
* of changes is only guaranteed for volatile variables.
*/
private volatile SelfCloseableHttpClient client;
public static ConfigServerHttpRequestExecutor create(
Collection<URI> configServerUris,
Optional<KeyStoreOptions> keyStoreOptions,
Optional<KeyStoreOptions> trustStoreOptions,
Optional<AthenzIdentity> athenzIdentity) {
Supplier<SelfCloseableHttpClient> clientSupplier = () -> createHttpClient(keyStoreOptions, trustStoreOptions, athenzIdentity);
ConfigServerHttpRequestExecutor requestExecutor = new ConfigServerHttpRequestExecutor(
randomizeConfigServerUris(configServerUris), clientSupplier.get());
if (keyStoreOptions.isPresent() || trustStoreOptions.isPresent()) {
requestExecutor.clientRefresherScheduler.scheduleAtFixedRate(() -> requestExecutor.client = clientSupplier.get(),
CLIENT_REFRESH_INTERVAL.toMillis(), CLIENT_REFRESH_INTERVAL.toMillis(), TimeUnit.MILLISECONDS);
}
return requestExecutor;
}
ConfigServerHttpRequestExecutor(List<URI> configServerHosts, SelfCloseableHttpClient client) {
this.configServerHosts = configServerHosts;
this.client = client;
}
public interface CreateRequest {
HttpUriRequest createRequest(URI configServerUri) throws JsonProcessingException, UnsupportedEncodingException;
}
private <T> T tryAllConfigServers(CreateRequest requestFactory, Class<T> wantedReturnType) {
Exception lastException = null;
for (URI 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 {
Optional<HttpException> retryableException = HttpException.handleStatusCode(
response.getStatusLine().getStatusCode(),
"Config server " + configServer);
if (retryableException.isPresent()) {
lastException = retryableException.get();
continue;
}
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, Optional<Object> bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPut put = new HttpPut(configServer.resolve(path));
setContentTypeToApplicationJson(put);
if (bodyJsonPojo.isPresent()) {
put.setEntity(new StringEntity(mapper.writeValueAsString(bodyJsonPojo.get())));
}
return put;
}, wantedReturnType);
}
public <T> T patch(String path, Object bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPatch patch = new HttpPatch(configServer.resolve(path));
setContentTypeToApplicationJson(patch);
patch.setEntity(new StringEntity(mapper.writeValueAsString(bodyJsonPojo)));
return patch;
}, wantedReturnType);
}
public <T> T delete(String path, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer ->
new HttpDelete(configServer.resolve(path)), wantedReturnType);
}
public <T> T get(String path, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer ->
new HttpGet(configServer.resolve(path)), wantedReturnType);
}
public <T> T post(String path, Object bodyJsonPojo, Class<T> wantedReturnType) {
return tryAllConfigServers(configServer -> {
HttpPost post = new HttpPost(configServer.resolve(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 URIs to balance load
private static List<URI> randomizeConfigServerUris(Collection<URI> configServerUris) {
List<URI> shuffledConfigServerHosts = new ArrayList<>(configServerUris);
Collections.shuffle(shuffledConfigServerHosts);
return shuffledConfigServerHosts;
}
private static SelfCloseableHttpClient createHttpClient(Optional<KeyStoreOptions> keyStoreOptions,
Optional<KeyStoreOptions> trustStoreOptions,
Optional<AthenzIdentity> athenzIdentity) {
NODE_ADMIN_LOGGER.info("Creating new HTTP client");
try {
SSLContext sslContext = makeSslContext(keyStoreOptions, trustStoreOptions);
HostnameVerifier hostnameVerifier = makeHostnameVerifier(athenzIdentity);
SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);
return new SelfCloseableHttpClient(sslSocketFactory);
} catch (Exception e) {
NODE_ADMIN_LOGGER.error("Failed to create HTTP client with custom SSL Context, proceeding with default", e);
return new SelfCloseableHttpClient();
}
}
private static SSLContext makeSslContext(Optional<KeyStoreOptions> keyStoreOptions, Optional<KeyStoreOptions> trustStoreOptions) {
AthenzSslContextBuilder sslContextBuilder = new AthenzSslContextBuilder();
trustStoreOptions.ifPresent(options -> sslContextBuilder.withTrustStore(options.path.toFile(), options.type));
keyStoreOptions.ifPresent(options ->
sslContextBuilder.withKeyStore(options.path.toFile(), options.password, options.type));
return sslContextBuilder.build();
}
private static HostnameVerifier makeHostnameVerifier(Optional<AthenzIdentity> athenzIdentity) {
return athenzIdentity
.map(identity -> (HostnameVerifier) new AthenzIdentityVerifier(Collections.singleton(identity)))
.orElse(SSLConnectionSocketFactory.getDefaultHostnameVerifier());
}
@Override
public void close() {
clientRefresherScheduler.shutdown();
do {
try {
clientRefresherScheduler.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e1) {
NODE_ADMIN_LOGGER.info("Interrupted while waiting for clientRefresherScheduler to shutdown");
}
} while (!clientRefresherScheduler.isTerminated());
client.close();
}
}
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