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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 java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Table;
import com.google.common.collect.Table.Cell;
import com.yahoo.vespa.serviceview.bindings.ApplicationView;
import com.yahoo.vespa.serviceview.bindings.ClusterView;
import com.yahoo.vespa.serviceview.bindings.HostService;
import com.yahoo.vespa.serviceview.bindings.ModelResponse;
import com.yahoo.vespa.serviceview.bindings.ServicePort;
import com.yahoo.vespa.serviceview.bindings.ServiceView;
import edu.umd.cs.findbugs.annotations.NonNull;
/**
* A transposed view for cloud.config.model.
*
* @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
*/
public final class ServiceModel {
private static final String CLUSTERCONTROLLER_TYPENAME = "container-clustercontroller";
private static final String CONTENT_CLUSTER_TYPENAME = "content";
private final Map<String, Service> servicesMap;
/**
* An ordered list of the clusters in this config model.
*/
@NonNull
public final ImmutableList<Cluster> clusters;
ServiceModel(ModelResponse modelConfig) {
Table<String, String, List<Service>> services = HashBasedTable.create();
for (HostService h : modelConfig.hosts) {
String hostName = h.name;
for (com.yahoo.vespa.serviceview.bindings.Service s : h.services) {
addService(services, hostName, s);
}
}
List<Cluster> sortingBuffer = new ArrayList<>();
for (Cell<String, String, List<Service>> c : services.cellSet()) {
sortingBuffer.add(new Cluster(c.getRowKey(), c.getColumnKey(), c.getValue()));
}
Collections.sort(sortingBuffer);
ImmutableList.Builder<Cluster> clustersBuilder = new ImmutableList.Builder<>();
clustersBuilder.addAll(sortingBuffer);
clusters = clustersBuilder.build();
Map<String, Service> seenIdentifiers = new HashMap<>();
for (Cluster c : clusters) {
for (Service s : c.services) {
List<String> identifiers = s.getIdentifiers();
for (String identifier : identifiers) {
if (seenIdentifiers.containsKey(identifier)) {
throw new RuntimeException(
"Congrats, you have a publishable result. We have a very unexpected hash collision" + " between "
+ seenIdentifiers.get(identifier) + " and " + s + ".");
}
seenIdentifiers.put(identifier, s);
}
}
}
ImmutableMap.Builder<String, Service> servicesBuilder = new ImmutableMap.Builder<>();
servicesBuilder.putAll(seenIdentifiers);
servicesMap = servicesBuilder.build();
}
private static void addService(Table<String, String, List<Service>> services,
String hostName,
com.yahoo.vespa.serviceview.bindings.Service s) {
boolean hasStateApi = false;
int statePort = 0;
List<Integer> ports = new ArrayList<>(s.ports.size());
for (ServicePort port : s.ports) {
ports.add(port.number);
if (!hasStateApi && port.hasTags("http", "state")) {
hasStateApi = true;
statePort = port.number;
}
}
// ignore hosts without state API
if (hasStateApi) {
Service service = new Service(s.type, hostName, statePort, s.clustername, s.clustertype, s.configid, ports, s.name);
getAndSetEntry(services, s.clustername, s.clustertype).add(service);
}
}
private static List<Service> getAndSetEntry(Table<String, String, List<Service>> services, String clusterName, String clusterType) {
List<Service> serviceList = services.get(clusterName, clusterType);
if (serviceList == null) {
serviceList = new ArrayList<>();
services.put(clusterName, clusterType, serviceList);
}
return serviceList;
}
/**
* The top level view of a given application.
*
* @return a top level view of the entire application in a form suitable for
* consumption by a REST API
*/
public ApplicationView showAllClusters(String uriBase, String applicationIdentifier) {
ApplicationView response = new ApplicationView();
List<ClusterView> clusterViews = new ArrayList<>();
for (Cluster c : clusters) {
clusterViews.add(showCluster(c, uriBase, applicationIdentifier));
}
response.clusters = clusterViews;
return response;
}
private ClusterView showCluster(Cluster c, String uriBase, String applicationIdentifier) {
List<ServiceView> services = new ArrayList<>();
for (Service s : c.services) {
ServiceView service = new ServiceView();
StringBuilder buffer = getLinkBuilder(uriBase).append(applicationIdentifier).append('/');
service.url = buffer.append("service/").append(s.getIdentifier(s.statePort)).append("/state/v1/").toString();
service.serviceType = s.serviceType;
service.serviceName = s.name;
service.configId = s.configId;
service.host = s.host;
addLegacyLink(uriBase, applicationIdentifier, s, service);
services.add(service);
}
ClusterView v = new ClusterView();
v.services = services;
v.name = c.name;
v.type = c.type;
if (CONTENT_CLUSTER_TYPENAME.equals(c.type)) {
Service s = getFirstClusterController();
StringBuilder buffer = getLinkBuilder(uriBase).append(applicationIdentifier).append('/');
buffer.append("service/").append(s.getIdentifier(s.statePort)).append("/cluster/v2/").append(c.name);
v.url = buffer.toString();
} else {
v.url = null;
}
return v;
}
private void addLegacyLink(String uriBase, String applicationIdentifier, Service s, ServiceView service) {
if (s.serviceType.equals("storagenode") || s.serviceType.equals("distributor")) {
StringBuilder legacyBuffer = getLinkBuilder(uriBase);
legacyBuffer.append("legacy/").append(applicationIdentifier).append('/');
legacyBuffer.append("service/").append(s.getIdentifier(s.statePort)).append('/');
service.legacyStatusPages = legacyBuffer.toString();
}
}
private Service getFirstServiceInstanceByType(@NonNull String typeName) {
for (Cluster c : clusters) {
for (Service s : c.services) {
if (typeName.equals(s.serviceType)) {
return s;
}
}
}
throw new IllegalStateException("This installation has but no service of required type: "
+ typeName + ".");
}
private Service getFirstClusterController() {
// This is used assuming all cluster controllers know of all fleet controllers in an application
return getFirstServiceInstanceByType(CLUSTERCONTROLLER_TYPENAME);
}
private StringBuilder getLinkBuilder(String uriBase) {
StringBuilder buffer = new StringBuilder(uriBase);
if (!uriBase.endsWith("/")) {
buffer.append('/');
}
return buffer;
}
@Override
public String toString() {
final int maxLen = 3;
StringBuilder builder = new StringBuilder();
builder.append("ServiceModel [clusters=")
.append(clusters.subList(0, Math.min(clusters.size(), maxLen))).append("]");
return builder.toString();
}
/**
* Match an identifier with a service for this cluster.
*
* @param identifier
* an opaque service identifier generated by the service
* @return the corresponding Service instance
*/
public Service getService(String identifier) {
return servicesMap.get(identifier);
}
/**
* Find a service based on host and port.
*
* @param host
* the name of the host running the service
* @param port
* a port owned by the service
* @param self
* the service which generated the host data
* @return a service instance fullfilling the criteria
* @throws IllegalArgumentException
* if no matching service is found
*/
public Service resolve(String host, int port, Service self) {
Integer portAsObject = Integer.valueOf(port);
String realHost;
if ("localhost".equals(host)) {
realHost = self.host;
} else {
realHost = host;
}
for (Cluster c : clusters) {
for (Service s : c.services) {
if (s.host.equals(realHost) && s.ports.contains(portAsObject)) {
return s;
}
}
}
throw new IllegalArgumentException("No registered service owns port " + port + " on host " + realHost + ".");
}
}
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