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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.controller.restapi.application;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.vespa.hosted.controller.api.integration.zone.ZoneId;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.JsonFormat;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.restapi.Uri;
import com.yahoo.vespa.serviceview.bindings.ApplicationView;
import com.yahoo.vespa.serviceview.bindings.ClusterView;
import com.yahoo.vespa.serviceview.bindings.ServiceView;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A response containing a service view for an application deployment.
* This does not define the API response but merely proxies the API response provided by Vespa, with URLs
* rewritten to include zone and application information allow proxying through the controller
*
* @author Steinar Knutsen
* @author bratseth
*/
class ServiceApiResponse extends HttpResponse {
private final ZoneId zone;
private final ApplicationId application;
private final List<URI> configServerURIs;
private final Slime slime;
private final Uri requestUri;
// Only set for one of the setResponse calls
private String serviceName = null;
private String restPath = null;
public ServiceApiResponse(ZoneId zone, ApplicationId application, List<URI> configServerURIs, URI requestUri) {
super(200);
this.zone = zone;
this.application = application;
this.configServerURIs = configServerURIs;
this.slime = new Slime();
this.requestUri = new Uri(requestUri).withoutParameters();
}
public void setResponse(ApplicationView applicationView) {
Cursor clustersArray = slime.setObject().setArray("clusters");
for (ClusterView clusterView : applicationView.clusters) {
Cursor clusterObject = clustersArray.addObject();
clusterObject.setString("name", clusterView.name);
clusterObject.setString("type", clusterView.type);
setNullableString("url", rewriteIfUrl(clusterView.url, requestUri), clusterObject);
Cursor servicesArray = clusterObject.setArray("services");
for (ServiceView serviceView : clusterView.services) {
Cursor serviceObject = servicesArray.addObject();
setNullableString("url", rewriteIfUrl(serviceView.url, requestUri), serviceObject);
serviceObject.setString("serviceType", serviceView.serviceType);
serviceObject.setString("serviceName", serviceView.serviceName);
serviceObject.setString("configId", serviceView.configId);
serviceObject.setString("host", serviceView.host);
}
}
}
public void setResponse(Map<?,?> responseData, String serviceName, String restPath) {
this.serviceName = serviceName;
this.restPath = restPath;
mapToSlime(responseData, slime.setObject());
}
@Override
public void render(OutputStream stream) throws IOException {
new JsonFormat(true).encode(stream, slime);
}
@SuppressWarnings("unchecked")
private void mapToSlime(Map<?,?> data, Cursor object) {
for (Map.Entry<String, Object> entry : ((Map<String, Object>)data).entrySet())
fieldToSlime(entry.getKey(), entry.getValue(), object);
}
private void fieldToSlime(String key, Object value, Cursor object) {
if (value instanceof String) {
if (key.equals("url") || key.equals("link"))
value = rewriteIfUrl((String)value, generateLocalLinkPrefix(serviceName, restPath));
setNullableString(key, (String)value, object);
}
else if (value instanceof Integer) {
object.setLong(key, (int)value);
}
else if (value instanceof Long) {
object.setLong(key, (long)value);
}
else if (value instanceof Float) {
object.setDouble(key, (double)value);
}
else if (value instanceof Double) {
object.setDouble(key, (double)value);
}
else if (value instanceof List) {
listToSlime((List)value, object.setArray(key));
}
else if (value instanceof Map) {
mapToSlime((Map<?,?>)value, object.setObject(key));
}
}
private void listToSlime(List<?> list, Cursor array) {
for (Object entry : list)
entryToSlime(entry, array);
}
private void entryToSlime(Object entry, Cursor array) {
if (entry instanceof String)
addNullableString(rewriteIfUrl((String)entry, generateLocalLinkPrefix(serviceName, restPath)), array);
else if (entry instanceof Integer)
array.addLong((long)entry);
else if (entry instanceof Long)
array.addLong((long)entry);
else if (entry instanceof Float)
array.addDouble((double)entry);
else if (entry instanceof Double)
array.addDouble((double)entry);
else if (entry instanceof List)
listToSlime((List)entry, array.addArray());
else if (entry instanceof Map)
mapToSlime((Map)entry, array.addObject());
}
private String rewriteIfUrl(String urlOrAnyString, Uri requestUri) {
if (urlOrAnyString == null) return null;
String hostPattern = "(" +
String.join(
"|", configServerURIs.stream()
.map(URI::toString)
.map(s -> s.substring(0, s.length() -1))
.map(Pattern::quote)
.toArray(String[]::new))
+ ")";
String remoteServicePath = "/serviceview/"
+ "v1/tenant/" + application.tenant().value()
+ "/application/" + application.application().value()
+ "/environment/" + zone.environment().value()
+ "/region/" + zone.region().value()
+ "/instance/" + application.instance()
+ "/service/";
Pattern remoteServiceResourcePattern = Pattern.compile("^(" + hostPattern + Pattern.quote(remoteServicePath) + ")");
Matcher matcher = remoteServiceResourcePattern.matcher(urlOrAnyString);
if (matcher.find()) {
String proxiedPath = urlOrAnyString.substring(matcher.group().length());
return requestUri.append(proxiedPath).toString();
} else {
return urlOrAnyString; // not a service url
}
}
private Uri generateLocalLinkPrefix(String identifier, String restPath) {
String proxiedPath = identifier + "/" + restPath;
if (this.requestUri.toString().endsWith(proxiedPath)) {
return new Uri(this.requestUri.toString().substring(0, this.requestUri.toString().length() - proxiedPath.length()));
} else {
throw new IllegalStateException("Expected the resource path '" + this.requestUri + "' to end with '" + proxiedPath + "'");
}
}
private void setNullableString(String key, String valueOrNull, Cursor receivingObject) {
if (valueOrNull == null)
receivingObject.setNix(key);
else
receivingObject.setString(key, valueOrNull);
}
private void addNullableString(String valueOrNull, Cursor receivingArray) {
if (valueOrNull == null)
receivingArray.addNix();
else
receivingArray.addString(valueOrNull);
}
}
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