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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.model.builder.xml.dom;
import com.yahoo.config.application.Xml;
import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.model.ConfigModelContext;
import com.yahoo.config.model.builder.xml.ConfigModelBuilder;
import com.yahoo.config.model.builder.xml.ConfigModelId;
import com.yahoo.messagebus.routing.ApplicationSpec;
import com.yahoo.messagebus.routing.HopSpec;
import com.yahoo.messagebus.routing.RouteSpec;
import com.yahoo.messagebus.routing.RoutingSpec;
import com.yahoo.messagebus.routing.RoutingTableSpec;
import com.yahoo.text.XML;
import com.yahoo.vespa.model.routing.Routing;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.List;
/**
* Builds the Routing plugin
*
* @author vegardh
*/
public class DomRoutingBuilder extends ConfigModelBuilder<Routing> {
public DomRoutingBuilder() {
super(Routing.class);
}
@Override
public List<ConfigModelId> handlesElements() {
return List.of(ConfigModelId.fromName("routing"));
}
// Overrides ConfigModelBuilder.
@Override
public void doBuild(Routing plugin, Element spec, ConfigModelContext modelContext) {
ApplicationSpec app = null;
RoutingSpec routing = null;
if (spec != null) {
app = new ApplicationSpec();
for (Element node : Xml.mergeElems(spec, "services", modelContext.getApplicationPackage(), ApplicationPackage.ROUTINGTABLES_DIR)) {
addServices(app, node);
}
routing = new RoutingSpec();
for (Element node : Xml.mergeElems(spec, "routingtable", modelContext.getApplicationPackage(), ApplicationPackage.ROUTINGTABLES_DIR)) {
addRoutingTable(routing, node);
}
}
plugin.setExplicitApplicationSpec(app);
plugin.setExplicitRoutingSpec(routing);
}
/**
* This function updates the given application with the data contained in the given xml element.
*
* @param app The application to update.
* @param element The element to base the services on.
*/
private static void addServices(ApplicationSpec app, Element element) {
String protocol = element.getAttribute("protocol");
for (Element node : XML.getChildren(element, "service")) {
app.addService(protocol, node.getAttribute("name"));
}
}
/**
* This function updates the given routing spec with the data contained in the given xml element.
*
* @param routing The routing spec to update.
* @param element The element to base the route config on.
*/
private static void addRoutingTable(RoutingSpec routing, Element element) {
boolean verify = shouldVerify(element);
RoutingTableSpec table = new RoutingTableSpec(element.getAttribute("protocol"), verify);
NodeList children = element.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if ("hop".equals(node.getNodeName())) {
table.addHop(createHopSpec((Element)node));
} else if ("route".equals(node.getNodeName())) {
table.addRoute(createRouteSpec((Element)node));
}
}
routing.addTable(table);
}
/**
* This function creates a route from the content of the given xml element.
*
* @param element The element to base the route config on.
* @return The corresponding route spec.
*/
private static RouteSpec createRouteSpec(Element element) {
boolean verify = shouldVerify(element);
RouteSpec route = new RouteSpec(element.getAttribute("name"), verify);
String hops = element.getAttribute("hops");
int from = 0;
for (int to = 0, depth = 0, len = hops.length(); to < len; ++to) {
if (hops.charAt(to) == '[') {
++depth;
} else if (hops.charAt(to) == ']') {
--depth;
} else if (hops.charAt(to) == ' ' && depth == 0) {
if (to > from) {
route.addHop(hops.substring(from, to));
}
from = to + 1;
}
}
if (from < hops.length()) {
route.addHop(hops.substring(from));
}
return route;
}
/**
* This function creates a hop from the content of the given xml element.
*
* @param element The element to base the hop config on.
* @return The corresponding hop spec.
*/
private static HopSpec createHopSpec(Element element) {
boolean verify = shouldVerify(element);
HopSpec hop = new HopSpec(element.getAttribute("name"), element.getAttribute("selector"), verify);
if (Boolean.parseBoolean(element.getAttribute("ignore-result"))) {
hop.setIgnoreResult(true);
}
NodeList children = element.getElementsByTagName("recipient");
for (int i = 0; i < children.getLength(); i++) {
Element node = (Element)children.item(i);
hop.addRecipient(node.getAttribute("session"));
}
return hop;
}
private static boolean shouldVerify(Element element) {
return !element.hasAttribute("verify") || Boolean.parseBoolean(element.getAttribute("verify"));
}
}
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