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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.vespa.model.routing;
import com.yahoo.config.model.ConfigModelRepo;
import com.yahoo.document.select.DocumentSelector;
import com.yahoo.documentapi.messagebus.protocol.DocumentrouteselectorpolicyConfig;
import com.yahoo.documentapi.messagebus.protocol.DocumentProtocolPoliciesConfig;
import com.yahoo.messagebus.routing.ApplicationSpec;
import com.yahoo.messagebus.routing.HopSpec;
import com.yahoo.messagebus.routing.RouteSpec;
import com.yahoo.messagebus.routing.RoutingTableSpec;
import com.yahoo.vespa.config.content.MessagetyperouteselectorpolicyConfig;
import com.yahoo.vespa.model.container.Container;
import com.yahoo.vespa.model.container.ContainerCluster;
import com.yahoo.vespa.model.container.ContainerModel;
import com.yahoo.vespa.model.container.docproc.ContainerDocproc;
import com.yahoo.vespa.model.container.docproc.DocprocChain;
import com.yahoo.vespa.model.content.Content;
import com.yahoo.vespa.model.content.cluster.ContentCluster;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
/**
* This class is responsible for generating all hops and routes for the Document protocol running on message bus. All
* the code within could really be part of {@link Routing}, but it has been partitioned out to allow better readability
* and also more easily maintainable as the number of protocols increase.
*
* @author Simon Thoresen Hult
*/
public final class DocumentProtocol implements Protocol,
DocumentrouteselectorpolicyConfig.Producer,
DocumentProtocolPoliciesConfig.Producer {
private static final String NAME = "document";
private final ApplicationSpec application;
private final RoutingTableSpec routingTable;
private final ConfigModelRepo repo;
public static String getIndexedRouteName(String configId) {
return configId + "-index";
}
public static String getDirectRouteName(String configId) {
return configId + "-direct";
}
/**
* Constructs a new document protocol based on the content of the given plugins.
*
* @param plugins the plugins to reflect on
*/
DocumentProtocol(ConfigModelRepo plugins) {
application = createApplicationSpec(plugins);
routingTable = createRoutingTable(plugins);
this.repo = plugins;
}
/**
* Creates a service index based on the plugins loaded. This means to fill the index with all services known by this
* protocol by traversing the plugins.
*
* @param plugins All initialized plugins of the Vespa model
* @return the index of all known services
*/
private static ApplicationSpec createApplicationSpec(ConfigModelRepo plugins) {
ApplicationSpec ret = new ApplicationSpec();
for (ContentCluster cluster : Content.getContentClusters(plugins)) {
for (com.yahoo.vespa.model.content.Distributor node : cluster.getDistributorNodes().getChildren().values()) {
ret.addService(NAME, node.getConfigId() + "/default");
}
}
for (ContainerCluster containerCluster: ContainerModel.containerClusters(plugins)) {
ContainerDocproc containerDocproc = containerCluster.getDocproc();
if (containerDocproc != null) {
createDocprocChainSpec(ret,
containerDocproc.getChains().allChains().allComponents(),
containerCluster.getContainers());
}
}
return ret;
}
private static void createDocprocChainSpec(ApplicationSpec spec,
List docprocChains,
List containerNodes) {
for (DocprocChain chain: docprocChains) {
for (Container node: containerNodes)
spec.addService(NAME, node.getConfigId() + "/chain." + chain.getComponentId().stringValue());
}
}
@Override
public void getConfig(DocumentrouteselectorpolicyConfig.Builder builder) {
for (ContentCluster cluster : Content.getContentClusters(repo)) {
addRoute(cluster.getConfigId(), cluster.getRoutingSelector(), builder);
}
}
@Override
public void getConfig(DocumentProtocolPoliciesConfig.Builder builder) {
for (ContentCluster cluster : Content.getContentClusters(repo)) {
DocumentProtocolPoliciesConfig.Cluster.Builder clusterBuilder = new DocumentProtocolPoliciesConfig.Cluster.Builder();
addSelector(cluster.getConfigId(), cluster.getRoutingSelector(), clusterBuilder);
addRoutes(getDirectRouteName(cluster.getConfigId()), getIndexedRouteName(cluster.getConfigId()), clusterBuilder);
builder.cluster(cluster.getConfigId(), clusterBuilder);
}
}
public static void getConfig(MessagetyperouteselectorpolicyConfig.Builder builder, String configId) {
builder.defaultroute(getDirectRouteName(configId))
.route(new MessagetyperouteselectorpolicyConfig.Route.Builder()
.messagetype(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_PUTDOCUMENT)
.name(getIndexedRouteName(configId)))
.route(new MessagetyperouteselectorpolicyConfig.Route.Builder()
.messagetype(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_REMOVEDOCUMENT)
.name(getIndexedRouteName(configId)))
.route(new MessagetyperouteselectorpolicyConfig.Route.Builder()
.messagetype(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_UPDATEDOCUMENT)
.name(getIndexedRouteName(configId)));
}
private static void addRoutes(String directRoute, String indexedRoute, DocumentProtocolPoliciesConfig.Cluster.Builder builder) {
builder.defaultRoute(directRoute)
.route(new DocumentProtocolPoliciesConfig.Cluster.Route.Builder()
.messageType(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_PUTDOCUMENT)
.name(indexedRoute))
.route(new DocumentProtocolPoliciesConfig.Cluster.Route.Builder()
.messageType(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_REMOVEDOCUMENT)
.name(indexedRoute))
.route(new DocumentProtocolPoliciesConfig.Cluster.Route.Builder()
.messageType(com.yahoo.documentapi.messagebus.protocol.DocumentProtocol.MESSAGE_UPDATEDOCUMENT)
.name(indexedRoute));
}
private static void addSelector(String clusterConfigId, String selector, DocumentProtocolPoliciesConfig.Cluster.Builder builder) {
try {
new DocumentSelector(selector);
} catch (com.yahoo.document.select.parser.ParseException e) {
throw new IllegalArgumentException("Failed to parse selector '" + selector +
"' for route '" + clusterConfigId +
"' in policy 'DocumentRouteSelector'.");
}
builder.selector(selector);
}
private static void addRoute(String clusterConfigId, String selector, DocumentrouteselectorpolicyConfig.Builder builder) {
try {
new DocumentSelector(selector);
} catch (com.yahoo.document.select.parser.ParseException e) {
throw new IllegalArgumentException("Failed to parse selector '" + selector +
"' for route '" + clusterConfigId +
"' in policy 'DocumentRouteSelector'.");
}
DocumentrouteselectorpolicyConfig.Route.Builder routeBuilder = new DocumentrouteselectorpolicyConfig.Route.Builder();
routeBuilder.name(clusterConfigId);
routeBuilder.selector(selector);
builder.route(routeBuilder);
}
/**
* This function extrapolates any routes for the document protocol that it can from the vespa model.
*
* @param plugins all initialized plugins of the vespa model
* @return routing table for the document protocol
*/
private static RoutingTableSpec createRoutingTable(ConfigModelRepo plugins) {
// Build simple hops and routes.
List content = Content.getContentClusters(plugins);
Collection> containerClusters = ContainerModel.containerClusters(plugins);
RoutingTableSpec table = new RoutingTableSpec(NAME);
addContainerClusterDocprocHops(containerClusters, table);
addContentRouting(content, table);
// Build the indexing hop if it is possible to derive.
addIndexingHop(content, table);
// Build the default routes if possible
addDefaultRoutes(content, containerClusters, table);
// Return the complete routing table.
simplifyRouteNames(table);
return table;
}
private static void addContainerClusterDocprocHops(Collection> containerClusters, RoutingTableSpec table) {
for (ContainerCluster cluster: containerClusters) {
ContainerDocproc docproc = cluster.getDocproc();
if (docproc != null) {
for (DocprocChain chain : docproc.getChains().allChains().allComponents()) {
addChainHop(table, cluster.getConfigId(), chain);
}
}
}
}
private static void addChainHop(RoutingTableSpec table, String configId, DocprocChain chain) {
StringBuilder selector = new StringBuilder();
selector.append("[LoadBalancer:cluster=").append(configId)
.append(";session=").append(chain.getSessionName())
.append("]");
table.addHop(new HopSpec(chain.getServiceName(), selector.toString()));
}
/**
* Create hops to all configured storage nodes for the Document protocol. The "Distributor" policy resolves its
* recipients using slobrok lookups, so it requires no configured recipients.
*
* @param content the storage model from {@link com.yahoo.vespa.model.VespaModel}
* @param table the routing table to add to
*/
private static void addContentRouting(List content, RoutingTableSpec table) {
for (ContentCluster cluster : content) {
RouteSpec spec = new RouteSpec(cluster.getConfigId());
var indexingDocproc = cluster.getSearch().getIndexingDocproc();
table.addRoute(spec.addHop("[MessageType:" + cluster.getConfigId() + "]"));
table.addRoute(new RouteSpec(getIndexedRouteName(cluster.getConfigId()))
.addHop(indexingDocproc.getServiceName())
.addHop("[Content:cluster=" + cluster.getName() + "]"));
table.addRoute(new RouteSpec(getDirectRouteName(cluster.getConfigId()))
.addHop("[Content:cluster=" + cluster.getName() + "]"));
table.addRoute(new RouteSpec("storage/cluster." + cluster.getName())
.addHop("route:" + cluster.getConfigId()));
}
}
/**
* Create the "indexing" hop. This hop contains all non-streaming search clusters as recipients, and the routing
* policy "SearchCluster" will decide which cluster(s) are to receive every document passed through it based on a
* document select string derived from services.xml.
*
* @param table the routing table to add to
*/
private static void addIndexingHop(List content, RoutingTableSpec table) {
if (content.isEmpty()) return;
HopSpec hop = new HopSpec("indexing", "[DocumentRouteSelector]");
for (ContentCluster cluster : content) {
hop.addRecipient(cluster.getConfigId());
}
if (hop.hasRecipients()) {
table.addHop(hop);
}
}
/**
* Create the {@code default} and {@code default-get} routes for the Document protocol. The {@code default}
* route will be either a route to storage or a route to search. Since recovery from storage is supported,
* storage takes precedence over search when deciding on the final target of the default route. If there
* is an unambiguous docproc cluster in the application, the {@code default} route will pass through it.
* The {@code default-get} route skips the docproc but is otherwise identical to the {@code default} route.
*
* @param content the content model from {@link com.yahoo.vespa.model.VespaModel}
* @param containerClusters a collection of {@link com.yahoo.vespa.model.container.ContainerCluster}s
* @param table the routing table to add to
*/
private static void addDefaultRoutes(List content,
Collection> containerClusters,
RoutingTableSpec table) {
if (content.isEmpty() || !indexingHopExists(table)) return;
RouteSpec route = new RouteSpec("default");
String hop = getContainerClustersDocprocHop(containerClusters);
if (hop != null) {
route.addHop(hop);
}
route.addHop("indexing");
table.addRoute(route);
if (content.size() == 1) {
table.addRoute(new RouteSpec("default-get").addHop("[Content:cluster=" + content.get(0).getConfigId() + "]"));
} else {
//TODO This should ideally skip indexing and go directly to correct cluster.
// But will handle the single cluster for now.
table.addRoute(new RouteSpec("default-get").addHop("indexing"));
}
}
private static boolean indexingHopExists(RoutingTableSpec table) {
for (int i = 0, len = table.getNumHops(); i < len; ++i) {
if (table.getHop(i).getName().equals("indexing")) {
return true;
}
}
return false;
}
private static String getContainerClustersDocprocHop(Collection> containerClusters) {
DocprocChain result = null;
for (ContainerCluster containerCluster: containerClusters) {
DocprocChain defaultChain = getDefaultChain(containerCluster.getDocproc());
if (defaultChain != null) {
if (result != null)
throw new IllegalArgumentException("Only a single default docproc chain is allowed across all container clusters");
result = defaultChain;
}
}
return result == null ? null: result.getServiceName();
}
private static DocprocChain getDefaultChain(ContainerDocproc docproc) {
return docproc == null
? null
: docproc.getChains().allChains().getComponent("default");
}
/**
* Attempts to simplify all route names by removing prefixing plugin name and whatever comes before the dot (.) in
* the second naming element. This can only be done to those routes that do not share primary name elements with
* other routes (e.g. a search clusters with the same name as a storage cluster).
*
* @param table the routing table whose route names are to be simplified
*/
private static void simplifyRouteNames(RoutingTableSpec table) {
if (table == null || !table.hasRoutes()) {
return;
}
// Pass 1: Determine which simplifications are in conflict.
Map> simple = new TreeMap<>();
List broken = new ArrayList<>();
for (int i = 0, len = table.getNumRoutes(); i < len; ++i) {
String before = table.getRoute(i).getName();
String after = simplifyRouteName(before);
if (simple.containsKey(after)) {
Set l = simple.get(after);
l.add(before);
if (!(l.contains("content/" + after) && l.contains("storage/cluster." + after) && (l.size() == 2))) {
broken.add(after);
}
} else {
Set l = new HashSet<>();
l.add(before);
simple.put(after, l);
}
}
// Pass 2: Simplify all non-conflicting route names by alias.
Set alias = new HashSet<>();
Set unique = new HashSet<>();
for (int i = 0; i < table.getNumRoutes(); ) {
RouteSpec route = table.getRoute(i);
String before = route.getName();
String after = simplifyRouteName(before);
if (!before.equals(after)) {
if (!broken.contains(after)) {
if (route.getNumHops() == 1 && route.getHop(0).equals(route.getName())) {
alias.add(new RouteSpec(after).addHop(route.getHop(0))); // full route name is redundant
unique.add(after);
table.removeRoute(i);
continue; // do not increment i
} else {
if (!unique.contains(after)) {
alias.add(new RouteSpec(after).addHop("route:" + before));
unique.add(after);
}
}
}
}
++i;
}
for (RouteSpec rs : alias) {
table.addRoute(rs);
}
}
/**
* Returns a simplified version of the given route name. This method will remove the first component of the name as
* separated by a forward slash, and then remove the first component of the remaining name as separated by a dot.
*
* @param name the route name to simplify
* @return the simplified route name
*/
private static String simplifyRouteName(String name) {
String[] foo = name.split("/", 2);
if (foo.length < 2) {
return name;
}
String[] bar = foo[1].split("\\.", 2);
if (bar.length < 2) {
return foo[1];
}
return bar[1];
}
@Override
public ApplicationSpec getApplicationSpec() {
return application;
}
@Override
public RoutingTableSpec getRoutingTableSpec() {
return routingTable;
}
}
