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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.serviceview;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
import com.google.inject.Inject;
import com.yahoo.cloud.config.ConfigserverConfig;
import com.yahoo.container.jdisc.ThreadedHttpRequestHandler;
import com.yahoo.restapi.RestApi;
import com.yahoo.restapi.RestApiRequestHandler;
import com.yahoo.restapi.UriBuilder;
import com.yahoo.vespa.serviceview.bindings.ApplicationView;
import com.yahoo.vespa.serviceview.bindings.ConfigClient;
import com.yahoo.vespa.serviceview.bindings.HealthClient;
import com.yahoo.vespa.serviceview.bindings.ModelResponse;
import org.glassfish.jersey.client.ClientProperties;
import org.glassfish.jersey.client.proxy.WebResourceFactory;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientRequestFilter;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.HttpHeaders;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
/**
* A web service to discover and proxy Vespa service state info.
*
* @author Steinar Knutsen
* @author bjorncs
*/
public class StateRequestHandler extends RestApiRequestHandler<StateRequestHandler> {
private static final String USER_AGENT = "service-view-config-server-client";
private static final String SINGLE_API_LINK = "url";
@SuppressWarnings("removal")
private final Client client = new ai.vespa.util.http.VespaClientBuilderFactory()
.newBuilder()
.property(ClientProperties.CONNECT_TIMEOUT, 10000)
.property(ClientProperties.READ_TIMEOUT, 10000)
.register(JacksonJsonProvider.class)
.register((ClientRequestFilter) ctx -> ctx.getHeaders().put(HttpHeaders.USER_AGENT, List.of(USER_AGENT)))
.build();
private final int restApiPort;
private static class GiveUpLinkRetargetingException extends Exception {
public GiveUpLinkRetargetingException(Throwable reason) {
super(reason);
}
public GiveUpLinkRetargetingException(String message) {
super(message);
}
}
@Inject
public StateRequestHandler(ThreadedHttpRequestHandler.Context context,
ConfigserverConfig configserverConfig) {
super(context, StateRequestHandler::createRestApiDefinition);
this.restApiPort = configserverConfig.httpport();
}
@Override
protected void destroy() {
client.close();
super.destroy();
}
private static RestApi createRestApiDefinition(StateRequestHandler self) {
return RestApi.builder()
.addRoute(RestApi.route("/serviceview/v1")
.get(self::getDefaultUserInfo))
.addRoute(RestApi.route("/serviceview/v1/")
.get(self::getDefaultUserInfo))
.addRoute(RestApi.route("/serviceview/v1/tenant/{tenantName}/application/{applicationName}/environment/{environmentName}/region/{regionName}/instance/{instanceName}")
.get(self::getUserInfo))
.addRoute(RestApi.route("/serviceview/v1/tenant/{tenantName}/application/{applicationName}/environment/{environmentName}/region/{regionName}/instance/{instanceName}/service/{serviceIdentifier}/{*}")
.get(self::singleService))
.registerJacksonResponseEntity(HashMap.class)
.registerJacksonResponseEntity(ApplicationView.class)
.build();
}
private ApplicationView getDefaultUserInfo(RestApi.RequestContext context) {
return getUserInfo(context.uriBuilder(), "default", "default", "default", "default", "default");
}
private ApplicationView getUserInfo(RestApi.RequestContext context) {
String tenantName = context.pathParameters().getStringOrThrow("tenantName");
String applicationName = context.pathParameters().getStringOrThrow("applicationName");
String environmentName = context.pathParameters().getStringOrThrow("environmentName");
String regionName = context.pathParameters().getStringOrThrow("regionName");
String instanceName = context.pathParameters().getStringOrThrow("instanceName");
return getUserInfo(context.uriBuilder(), tenantName, applicationName, environmentName, regionName, instanceName);
}
public HashMap<?, ?> singleService(RestApi.RequestContext context) {
String tenantName = context.pathParameters().getStringOrThrow("tenantName");
String applicationName = context.pathParameters().getStringOrThrow("applicationName");
String environmentName = context.pathParameters().getStringOrThrow("environmentName");
String regionName = context.pathParameters().getStringOrThrow("regionName");
String instanceName = context.pathParameters().getStringOrThrow("instanceName");
String identifier = context.pathParameters().getStringOrThrow("serviceIdentifier");
String apiParams = context.pathParameters().getString("*").orElse("");
return singleService(context.uriBuilder(), context.request().getUri(), tenantName, applicationName, environmentName, regionName, instanceName, identifier, apiParams);
}
protected ApplicationView getUserInfo(UriBuilder uriBuilder, String tenantName, String applicationName, String environmentName, String regionName, String instanceName) {
ServiceModel model = new ServiceModel(
getModelConfig(tenantName, applicationName, environmentName, regionName, instanceName));
return model.showAllClusters(
baseUri(uriBuilder).toString(),
applicationIdentifier(tenantName, applicationName, environmentName, regionName, instanceName));
}
protected ModelResponse getModelConfig(String tenant, String application, String environment, String region, String instance) {
WebTarget target = client.target("http://localhost:" + restApiPort + "/");
ConfigClient resource = WebResourceFactory.newResource(ConfigClient.class, target);
return resource.getServiceModel(tenant, application, environment, region, instance);
}
protected HashMap<?, ?> singleService(
UriBuilder uriBuilder, URI requestUri, String tenantName, String applicationName, String environmentName, String regionName, String instanceName, String identifier, String apiParams) {
ServiceModel model = new ServiceModel(getModelConfig(tenantName, applicationName, environmentName, regionName, instanceName));
Service s = model.getService(identifier);
int requestedPort = s.matchIdentifierWithPort(identifier);
HealthClient resource = getHealthClient(apiParams, s, requestedPort, requestUri.getRawQuery(), client);
HashMap<?, ?> apiResult = resource.getHealthInfo();
rewriteResourceLinks(uriBuilder, apiResult, model, s, applicationIdentifier(tenantName, applicationName, environmentName, regionName, instanceName), identifier);
return apiResult;
}
protected HealthClient getHealthClient(String apiParams, Service s, int requestedPort, String uriQuery, Client client) {
final StringBuilder uriBuffer = new StringBuilder("http://").append(s.host).append(':').append(requestedPort).append('/')
.append(apiParams);
addQuery(uriQuery, uriBuffer);
WebTarget target = client.target(uriBuffer.toString());
return WebResourceFactory.newResource(HealthClient.class, target);
}
private String applicationIdentifier(String tenant, String application, String environment, String region, String instance) {
return "tenant/" + tenant
+ "/application/" + application
+ "/environment/" + environment
+ "/region/" + region
+ "/instance/" + instance;
}
private void rewriteResourceLinks(UriBuilder uriBuilder,
Object apiResult,
ServiceModel model,
Service self,
String applicationIdentifier,
String incomingIdentifier) {
if (apiResult instanceof List) {
for (@SuppressWarnings("unchecked") ListIterator<Object> i = ((List<Object>) apiResult).listIterator(); i.hasNext();) {
Object resource = i.next();
if (resource instanceof String) {
try {
StringBuilder buffer = linkBuffer(uriBuilder, applicationIdentifier);
// if it points to a port and host not part of the application, rewriting will not occur, so this is kind of safe
retarget(model, self, buffer, (String) resource);
i.set(buffer.toString());
} catch (GiveUpLinkRetargetingException e) {
break; // assume relatively homogenous lists when doing rewrites to avoid freezing up on scanning long lists
}
} else {
rewriteResourceLinks(uriBuilder, resource, model, self, applicationIdentifier, incomingIdentifier);
}
}
} else if (apiResult instanceof Map) {
@SuppressWarnings("unchecked")
Map<Object, Object> api = (Map<Object, Object>) apiResult;
for (Map.Entry<Object, Object> entry : api.entrySet()) {
if (SINGLE_API_LINK.equals(entry.getKey()) && entry.getValue() instanceof String) {
try {
rewriteSingleLink(entry, model, self, linkBuffer(uriBuilder, applicationIdentifier));
} catch (GiveUpLinkRetargetingException e) {
// NOP
}
} else if ("link".equals(entry.getKey()) && entry.getValue() instanceof String) {
buildSingleLink(entry, linkBuffer(uriBuilder, applicationIdentifier), incomingIdentifier);
} else {
rewriteResourceLinks(uriBuilder, entry.getValue(), model, self, applicationIdentifier, incomingIdentifier);
}
}
}
}
private void buildSingleLink(Map.Entry<Object, Object> entry,
StringBuilder newUri,
String incomingIdentifier) {
newUri.append("/service/")
.append(incomingIdentifier);
newUri.append(entry.getValue());
entry.setValue(newUri.toString());
}
private void addQuery(String query, StringBuilder newUri) {
if (query != null && query.length() > 0) {
newUri.append('?').append(query);
}
}
private StringBuilder linkBuffer(UriBuilder uriBuilder, String applicationIdentifier) {
return baseUri(uriBuilder).append(applicationIdentifier);
}
private void rewriteSingleLink(Map.Entry<Object, Object> entry,
ServiceModel model,
Service self,
StringBuilder newUri) throws GiveUpLinkRetargetingException {
String url = (String) entry.getValue();
retarget(model, self, newUri, url);
entry.setValue(newUri.toString());
}
private void retarget(ServiceModel model, Service self, StringBuilder newUri, String url) throws GiveUpLinkRetargetingException {
URI link;
try {
link = new URI(url);
} catch (URISyntaxException e) {
throw new GiveUpLinkRetargetingException(e);
}
if (!link.isAbsolute()) {
throw new GiveUpLinkRetargetingException("This rewriting only supports absolute URIs.");
}
int linkPort = link.getPort();
if (linkPort == -1) {
linkPort = 80;
}
Service s;
try {
s = model.resolve(link.getHost(), linkPort, self);
} catch (IllegalArgumentException e) {
throw new GiveUpLinkRetargetingException(e);
}
newUri.append("/service/").append(s.getIdentifier(linkPort));
newUri.append(link.getRawPath());
}
private static StringBuilder baseUri(UriBuilder uriBuilder) {
return new StringBuilder(uriBuilder.withPath("/serviceview/v1/").toString());
}
}
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