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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.apputil.communication.http;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperation;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperationImpl;
import com.yahoo.vespa.clustercontroller.utils.communication.http.AsyncHttpClient;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpRequest;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpResult;
import com.yahoo.vespa.clustercontroller.utils.communication.http.SyncHttpClient;
import java.util.*;
import java.util.concurrent.Executor;
import java.util.logging.Logger;
/**
* There are some stuff to work around with the apache client.
* - Whether to use a proxy or not is global, not per request.
* - Timeout is not handled per request (and is not a request timeout but seems like a "something happening on TCP" timeout.
* - It is not thread safe.
*
* This class gets around these issues by creating one instance per unique setting, and ensuring only one request use a given instance at a time.
*/
public class ApacheAsyncHttpClient implements AsyncHttpClient<HttpResult> {
private static final Logger log = Logger.getLogger(ApacheAsyncHttpClient.class.getName());
public interface SyncHttpClientFactory {
SyncHttpClient createInstance(String proxyHost, int proxyPort, long timeoutMs);
}
public static class Settings {
String proxyHost;
int proxyPort;
long timeout;
Settings(HttpRequest request) {
timeout = request.getTimeoutMillis();
if (request.getPath() != null
&& !request.getPath().isEmpty()
&& request.getPath().charAt(0) != '/')
{
proxyHost = request.getHost();
proxyPort = request.getPort();
int colo = request.getPath().indexOf(':');
int slash = request.getPath().indexOf('/', colo);
if (colo < 0 && slash < 0) {
throw new IllegalStateException("Http path '" + request.getPath() + "' looks invalid. "
+ "Cannot extract proxy server data. Is it a regular request that "
+ "should start with a slash?");
}
if (colo < 0) {
request.setPort(80);
request.setHost(request.getPath().substring(0, slash));
} else {
request.setHost(request.getPath().substring(0, colo));
request.setPort(Integer.valueOf(request.getPath().substring(colo + 1, slash)));
}
request.setPath(request.getPath().substring(slash));
}
}
@Override
public boolean equals(Object other) {
Settings o = (Settings) other;
if (timeout != o.timeout || proxyPort != o.proxyPort
|| (proxyHost == null ^ o.proxyHost == null)
|| (proxyHost != null && !proxyHost.equals(o.proxyHost)))
{
return false;
}
return true;
}
@Override
public int hashCode() {
return (proxyHost == null ? 0 : proxyHost.hashCode()) ^ proxyPort ^ Long.valueOf(timeout).hashCode();
}
}
private final Executor executor;
private final SyncHttpClientFactory clientFactory;
private boolean closed = false;
private final int maxInstanceCacheSize; // Maximum number of currently unused instances.
private final Map<Settings, LinkedList<SyncHttpClient>> apacheInstances = new LinkedHashMap<Settings, LinkedList<SyncHttpClient>>() {
protected @Override boolean removeEldestEntry(Map.Entry<Settings,LinkedList<SyncHttpClient>> eldest) {
return getUnusedCacheSize() > maxInstanceCacheSize;
}
};
public ApacheAsyncHttpClient(Executor executor) {
this(executor, new SyncHttpClientFactory() {
@Override
public SyncHttpClient createInstance(String proxyHost, int proxyPort, long timeoutMs) {
return new ApacheHttpInstance(proxyHost, proxyPort, timeoutMs);
}
});
}
public ApacheAsyncHttpClient(Executor executor, SyncHttpClientFactory clientFactory) {
this.executor = executor;
this.clientFactory = clientFactory;
maxInstanceCacheSize = 16;
log.fine("Starting apache com.yahoo.vespa.clustercontroller.utils.communication.async HTTP client");
}
private SyncHttpClient getFittingInstance(Settings settings) {
synchronized (apacheInstances) {
if (closed) throw new IllegalStateException("Http client has been closed for business.");
LinkedList<SyncHttpClient> fittingInstances = apacheInstances.get(settings);
if (fittingInstances == null) {
fittingInstances = new LinkedList<>();
apacheInstances.put(settings, fittingInstances);
}
if (fittingInstances.isEmpty()) {
return clientFactory.createInstance(settings.proxyHost, settings.proxyPort, settings.timeout);
} else {
return fittingInstances.removeFirst();
}
}
}
private void insertInstance(Settings settings, SyncHttpClient instance) {
synchronized (apacheInstances) {
LinkedList<SyncHttpClient> fittingInstances = apacheInstances.get(settings);
if (closed || fittingInstances == null) {
instance.close();
return;
}
fittingInstances.addLast(instance);
}
}
private int getUnusedCacheSize() {
int size = 0;
synchronized (apacheInstances) {
for (LinkedList<SyncHttpClient> list : apacheInstances.values()) {
size += list.size();
}
}
return size;
}
@Override
public AsyncOperation<HttpResult> execute(HttpRequest r) {
final HttpRequest request = r.clone(); // Gonna modify it to extract proxy information
final Settings settings = new Settings(request);
final SyncHttpClient instance = getFittingInstance(settings);
final AsyncOperationImpl<HttpResult> op = new AsyncOperationImpl<>(r.toString(), r.toString(true));
executor.execute(new Runnable() {
@Override
public void run() {
HttpResult result;
Exception failure = null;
try{
result = instance.execute(request);
} catch (Exception e) {
result = new HttpResult().setHttpCode(500, "Apache client failed to execute request.");
failure = e;
}
insertInstance(settings, instance);
// Must insert back instance before tagging operation complete to ensure a following
// call can reuse same instance
if (failure != null) {
op.setFailure(failure, result);
} else {
op.setResult(result);
}
}
});
return op;
}
@Override
public void close() {
synchronized (apacheInstances) {
closed = true;
for (LinkedList<SyncHttpClient> list : apacheInstances.values()) {
for (SyncHttpClient instance : list) {
instance.close();
}
}
apacheInstances.clear();
}
}
}
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