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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.serviceview;
import ai.vespa.util.http.VespaClientBuilderFactory;
import com.yahoo.container.jaxrs.annotation.Component;
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 com.yahoo.vespa.serviceview.bindings.StateClient;
import org.glassfish.jersey.client.proxy.WebResourceFactory;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientRequestFilter;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriInfo;
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
*/
@Path("/")
public class StateResource implements StateClient {
private static final String USER_AGENT = "service-view-config-server-client";
private static final String SINGLE_API_LINK = "url";
@SuppressWarnings("removal")
private final VespaClientBuilderFactory clientBuilderFactory;
private final int restApiPort;
private final String host;
private final UriInfo uriInfo;
@SuppressWarnings("serial")
private static class GiveUpLinkRetargetingException extends Exception {
public GiveUpLinkRetargetingException(Throwable reason) {
super(reason);
}
public GiveUpLinkRetargetingException(String message) {
super(message);
}
}
public StateResource(@Component ConfigServerLocation configServer, @Context UriInfo ui) {
this.clientBuilderFactory = configServer.clientBuilderFactory;
this.restApiPort = configServer.restApiPort;
this.host = "localhost";
this.uriInfo = ui;
}
@Override
@GET
@Path("v1/")
@Produces(MediaType.APPLICATION_JSON)
public ApplicationView getDefaultUserInfo() {
return getUserInfo("default", "default", "default", "default", "default");
}
@Override
@GET
@Path("v1/tenant/{tenantName}/application/{applicationName}/environment/{environmentName}/region/{regionName}/instance/{instanceName}")
@Produces(MediaType.APPLICATION_JSON)
public ApplicationView getUserInfo(@PathParam("tenantName") String tenantName,
@PathParam("applicationName") String applicationName,
@PathParam("environmentName") String environmentName,
@PathParam("regionName") String regionName,
@PathParam("instanceName") String instanceName) {
ServiceModel model = new ServiceModel(
getModelConfig(tenantName, applicationName, environmentName, regionName, instanceName));
return model.showAllClusters(
getBaseUri() + "v1/",
applicationIdentifier(tenantName, applicationName, environmentName, regionName, instanceName));
}
private String getBaseUri() {
String baseUri = uriInfo.getBaseUri().toString();
if (baseUri.endsWith("/")) {
return baseUri;
} else {
return baseUri + "/";
}
}
protected ModelResponse getModelConfig(String tenant, String application, String environment, String region, String instance) {
Client client = client();
try {
WebTarget target = client.target("http://" + host + ":" + restApiPort + "/");
ConfigClient resource = WebResourceFactory.newResource(ConfigClient.class, target);
return resource.getServiceModel(tenant, application, environment, region, instance);
} finally {
client.close();
}
}
@SuppressWarnings("rawtypes")
@Override
@GET
@Path("v1/tenant/{tenantName}/application/{applicationName}/environment/{environmentName}/region/{regionName}/instance/{instanceName}/service/{serviceIdentifier}/{apiParams: .*}")
@Produces(MediaType.APPLICATION_JSON)
public HashMap singleService(@PathParam("tenantName") String tenantName,
@PathParam("applicationName") String applicationName,
@PathParam("environmentName") String environmentName,
@PathParam("regionName") String regionName,
@PathParam("instanceName") String instanceName,
@PathParam("serviceIdentifier") String identifier,
@PathParam("apiParams") String apiParams) {
ServiceModel model = new ServiceModel(getModelConfig(tenantName, applicationName, environmentName, regionName, instanceName));
Service s = model.getService(identifier);
int requestedPort = s.matchIdentifierWithPort(identifier);
Client client = client();
try {
HealthClient resource = getHealthClient(apiParams, s, requestedPort, client);
HashMap<?, ?> apiResult = resource.getHealthInfo();
rewriteResourceLinks(apiResult, model, s, applicationIdentifier(tenantName, applicationName, environmentName, regionName, instanceName), identifier);
return apiResult;
} finally {
client.close();
}
}
protected HealthClient getHealthClient(String apiParams, Service s, int requestedPort, Client client) {
final StringBuilder uriBuffer = new StringBuilder("http://").append(s.host).append(':').append(requestedPort).append('/')
.append(apiParams);
addQuery(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(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(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(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(applicationIdentifier));
} catch (GiveUpLinkRetargetingException e) {
// NOP
}
} else if ("link".equals(entry.getKey()) && entry.getValue() instanceof String) {
buildSingleLink(entry, linkBuffer(applicationIdentifier), incomingIdentifier);
} else {
rewriteResourceLinks(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(StringBuilder newUri) {
String query = uriInfo.getRequestUri().getRawQuery();
if (query != null && query.length() > 0) {
newUri.append('?').append(query);
}
}
private StringBuilder linkBuffer(String applicationIdentifier) {
StringBuilder newUri = new StringBuilder(getBaseUri());
newUri.append("v1/").append(applicationIdentifier);
return newUri;
}
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 Client client() {
return clientBuilderFactory.newBuilder()
.register((ClientRequestFilter) ctx -> ctx.getHeaders().put(HttpHeaders.USER_AGENT, List.of(USER_AGENT)))
.build();
}
}
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