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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.model;
import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.model.ConfigModelContext.ApplicationType;
import com.yahoo.config.model.builder.xml.ConfigModelBuilder;
import com.yahoo.config.model.builder.xml.ConfigModelId;
import com.yahoo.config.model.builder.xml.XmlHelper;
import com.yahoo.config.model.deploy.DeployState;
import com.yahoo.config.model.graph.ModelGraphBuilder;
import com.yahoo.config.model.graph.ModelNode;
import com.yahoo.config.model.producer.AnyConfigProducer;
import com.yahoo.config.model.producer.TreeConfigProducer;
import com.yahoo.config.model.provision.HostsXmlProvisioner;
import com.yahoo.text.XML;
import com.yahoo.vespa.model.VespaModel;
import com.yahoo.vespa.model.builder.VespaModelBuilder;
import com.yahoo.vespa.model.content.Content;
import com.yahoo.vespa.model.routing.Routing;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A collection of config model instances owned by a system model
*
* @author gjoranv
*/
public class ConfigModelRepo implements ConfigModelRepoAdder, Iterable {
private static final Logger log = Logger.getLogger(ConfigModelRepo.class.getPackage().toString());
private final Map configModelMap = new TreeMap<>();
private final List configModels = new ArrayList<>();
/**
* Returns a config model for a given id
*
* @param id the id of the model to return
* @return the model, or none if a model with this id is not present in this
*/
public ConfigModel get(String id) {
return configModelMap.get(id);
}
/** Adds a new config model instance in this */
@Override
public void add(ConfigModel model) {
configModelMap.put(model.getId(), model);
configModels.add(model);
}
/** Returns the models in this as an iterator */
public Iterator iterator() {
return configModels.iterator();
}
/** Returns a read-only view of the config model instances of this */
public Map asMap() { return Collections.unmodifiableMap(configModelMap); }
/** Initialize part 1.: Reads the config models used in the application package. */
public void readConfigModels(DeployState deployState,
VespaModel vespaModel,
VespaModelBuilder builder,
ApplicationConfigProducerRoot root,
ConfigModelRegistry configModelRegistry) throws IOException {
Element userServicesElement = getServicesFromApp(deployState.getApplicationPackage());
readConfigModels(root, userServicesElement, deployState, vespaModel, configModelRegistry);
builder.postProc(deployState, root, this);
}
private Element getServicesFromApp(ApplicationPackage applicationPackage) throws IOException {
try (Reader servicesFile = applicationPackage.getServices()) {
return getServicesFromReader(servicesFile);
}
}
/**
* If the top level is <services>, it contains a list of services elements,
* otherwise, the top level tag is a single service.
*/
private List getServiceElements(Element servicesRoot) {
if (servicesRoot.getTagName().equals("services"))
return XML.getChildren(servicesRoot);
List singleServiceList = new ArrayList<>(1);
singleServiceList.add(servicesRoot);
return singleServiceList;
}
/**
* Creates all the config models specified in the given XML element and
* passes their respective XML node as parameter.
*
* @param root The Root to set as parent for all plugins
* @param servicesRoot XML root node of the services file
*/
private void readConfigModels(ApplicationConfigProducerRoot root,
Element servicesRoot,
DeployState deployState,
VespaModel vespaModel,
ConfigModelRegistry configModelRegistry) {
final Map> model2Element = new LinkedHashMap<>();
ModelGraphBuilder graphBuilder = new ModelGraphBuilder();
final List children = getServiceElements(servicesRoot);
if (XML.getChild(servicesRoot, "admin") == null)
children.add(getImplicitAdmin(deployState));
for (Element servicesElement : children) {
String tagName = servicesElement.getTagName();
if (tagName.equals("legacy")) {
// for enabling legacy features from old vespa versions
continue;
}
if (tagName.equals("config")) {
// Top level config, mainly to be used by the Vespa team.
continue;
}
String tagVersion = servicesElement.getAttribute("version");
ConfigModelId xmlId = ConfigModelId.fromNameAndVersion(tagName, tagVersion);
Collection builders = configModelRegistry.resolve(xmlId);
if (builders.isEmpty())
throw new IllegalArgumentException("Could not resolve tag <" + tagName + " version=\"" + tagVersion + "\"> to a config model component");
for (ConfigModelBuilder builder : builders) {
if ( ! model2Element.containsKey(builder)) {
model2Element.put(builder, new ArrayList<>());
graphBuilder.addBuilder(builder);
}
model2Element.get(builder).add(servicesElement);
}
}
for (ModelNode node : graphBuilder.build().topologicalSort())
buildModels(node, getApplicationType(servicesRoot), deployState, vespaModel, root, model2Element.get(node.builder));
for (ConfigModel model : configModels)
model.initialize(ConfigModelRepo.this); // XXX deprecated
}
private ApplicationType getApplicationType(Element servicesRoot) {
return XmlHelper.getOptionalAttribute(servicesRoot, "application-type")
.map(ApplicationType::fromString)
.orElse(ApplicationType.DEFAULT);
}
private Element getServicesFromReader(Reader reader) {
Document doc = XmlHelper.getDocument(reader);
return doc.getDocumentElement();
}
private void buildModels(ModelNode node,
ApplicationType applicationType,
DeployState deployState,
VespaModel vespaModel,
TreeConfigProducer parent,
List elements) {
for (Element servicesElement : elements) {
ConfigModel model = buildModel(node, applicationType, deployState, vespaModel, parent, servicesElement);
if (model.isServing())
add(model);
}
}
private ConfigModel buildModel(ModelNode node,
ApplicationType applicationType,
DeployState deployState,
VespaModel vespaModel,
TreeConfigProducer parent,
Element servicesElement) {
ConfigModelBuilder builder = node.builder;
ConfigModelContext context = ConfigModelContext.create(applicationType, deployState, vespaModel, this, parent, getIdString(servicesElement));
return builder.build(node, servicesElement, context);
}
private static String getIdString(Element spec) {
String idString = XmlHelper.getIdString(spec);
if (idString == null || idString.isEmpty()) {
idString = spec.getTagName();
}
return idString;
}
/**
* Initialize part 2.:
* Prepare all config models for starting. Must be called after plugins are loaded and frozen.
*/
public void prepareConfigModels(DeployState deployState) {
for (ConfigModel model : configModels) {
model.prepare(this, deployState);
}
}
@SuppressWarnings("unchecked")
public List getModels(Class modelClass) {
List modelsOfModelClass = new ArrayList<>();
for (ConfigModel model : configModels) {
if (modelClass.isInstance(model))
modelsOfModelClass.add((T)model);
}
return modelsOfModelClass;
}
public Routing getRouting() {
for (ConfigModel m : configModels) {
if (m instanceof Routing) {
return (Routing)m;
}
}
return null;
}
public Content getContent() {
for (ConfigModel m : configModels) {
if (m instanceof Content) {
return (Content)m;
}
}
return null;
}
// TODO: Doctoring on the XML is the wrong level for this. We should be able to mark a model as default instead -Jon
private static Element getImplicitAdmin(DeployState deployState) {
String defaultAdminElement = deployState.isHosted() ? getImplicitAdminV4() : getImplicitAdminV2();
log.log(Level.FINE, () -> "No defined, using " + defaultAdminElement);
return XmlHelper.getDocument(new StringReader(defaultAdminElement)).getDocumentElement();
}
private static String getImplicitAdminV2() {
return "\n" +
" \n" +
"\n";
}
private static String getImplicitAdminV4() {
return """
""";
}
}
