Let config model generate endpoints

4 files changed, 190 insertions, 0 deletions

diff --git a/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterEndpoint.java b/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterEndpoint.java
new file mode 100644
index 00000000000..7593969ab61
--- /dev/null
+++ b/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterEndpoint.java
@@ -0,0 +1,177 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package com.yahoo.config.model.api;
+
+import com.yahoo.config.provision.ApplicationId;
+import com.yahoo.config.provision.ClusterSpec;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/**
+ * Represents one endpoint for an application cluster
+ *
+ * @author mortent
+ */
+public class ApplicationClusterEndpoint {
+    public enum Scope {APPLICATION, GLOBAL, ZONE}
+
+    public enum RoutingMethod {SHARED, SHAREDLAYER4}
+
+    private final DnsName dnsName;
+    private final Scope scope;
+    private final RoutingMethod routingMethod;
+    private final int weight;
+    private final List<String> hosts;
+
+    public ApplicationClusterEndpoint(DnsName dnsName, Scope scope, RoutingMethod routingMethod, int weight, List<String> hosts) {
+        this.dnsName = dnsName;
+        this.scope = scope;
+        this.routingMethod = routingMethod;
+        this.weight = weight;
+        this.hosts = List.copyOf(hosts);
+    }
+
+    public DnsName dnsName() {
+        return dnsName;
+    }
+
+    public Scope scope() {
+        return scope;
+    }
+
+    public RoutingMethod routingMethod() {
+        return routingMethod;
+    }
+
+    public int weight() {
+        return weight;
+    }
+
+    public List<String> hosts() {
+        return hosts;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+
+        private DnsName dnsName;
+        private Scope scope;
+        private RoutingMethod routingMethod;
+        private int weigth = 0;
+        private List<String> hosts;
+
+        public Builder dnsName(DnsName name) {
+            this.dnsName = name;
+            return this;
+        }
+
+        public Builder zoneScope() {
+            this.scope = Scope.ZONE;
+            return this;
+        }
+
+        public Builder applicationScope() {
+            this.scope = Scope.APPLICATION;
+            return this;
+        }
+
+        public Builder globalScope() {
+            this.scope = Scope.GLOBAL;
+            return this;
+        }
+
+        public Builder sharedRouting() {
+            this.routingMethod = RoutingMethod.SHARED;
+            return this;
+        }
+
+        public Builder sharedL4Routing() {
+            this.routingMethod = RoutingMethod.SHAREDLAYER4;
+            return this;
+        }
+
+        public Builder weight(int weigth) {
+            this.weigth = weigth;
+            return this;
+        }
+
+        public Builder hosts(List<String> hosts) {
+            this.hosts = List.copyOf(hosts);
+            return this;
+        }
+
+        public ApplicationClusterEndpoint build() {
+            return new ApplicationClusterEndpoint(dnsName, scope, routingMethod, weigth, hosts);
+        }
+    }
+
+    public static class DnsName {
+        private static final int MAX_LABEL_LENGTH = 63;
+
+        private final String name;
+
+        private DnsName(String name) {
+            this.name = name;
+        }
+
+        public String value() {
+            return name;
+        }
+
+        // TODO: remove
+        public static DnsName sharedNameFrom(ClusterSpec.Id cluster, ApplicationId applicationId, String suffix) {
+            String name = dnsParts(cluster, applicationId)
+                    .filter(Objects::nonNull)             // remove null values that were "default"
+                    .collect(Collectors.joining("--"));
+            return new DnsName(sanitize(name) + suffix); // Need to sanitize name since it is considered one label
+        }
+
+        public static DnsName sharedL4NameFrom(ClusterSpec.Id cluster, ApplicationId applicationId, String suffix) {
+            String name = dnsParts(cluster, applicationId)
+                    .filter(Objects::nonNull) // remove null values that were "default"
+                    .map(DnsName::sanitize)
+                    .collect(Collectors.joining("."));
+            return new DnsName(name + suffix);
+        }
+
+        public static DnsName from(String name) {
+            return new DnsName(name);
+        }
+
+        private static Stream<String> dnsParts(ClusterSpec.Id cluster, ApplicationId applicationId) {
+            return Stream.of(
+                    nullIfDefault(cluster.value()),
+                    nullIfDefault(applicationId.instance().value()),
+                    applicationId.application().value(),
+                    applicationId.tenant().value()
+            );
+        }
+
+        /**
+         * Remove any invalid characters from the hostnames
+         */
+        private static String sanitize(String id) {
+            return shortenIfNeeded(id.toLowerCase()
+                                           .replace('_', '-')
+                                           .replaceAll("[^a-z0-9-]*", ""));
+        }
+
+        /**
+         * Truncate the given string at the front so its length does not exceed 63 characters.
+         */
+        private static String shortenIfNeeded(String id) {
+            return id.substring(Math.max(0, id.length() - MAX_LABEL_LENGTH));
+        }
+
+        private static String nullIfDefault(String string) {
+            return Optional.of(string).filter(s -> !s.equals("default")).orElse(null);
+        }
+    }
+}
diff --git a/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterInfo.java b/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterInfo.java
new file mode 100644
index 00000000000..2cd2e980761
--- /dev/null
+++ b/config-model-api/src/main/java/com/yahoo/config/model/api/ApplicationClusterInfo.java
@@ -0,0 +1,9 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package com.yahoo.config.model.api;
+
+import java.util.List;
+
+public interface ApplicationClusterInfo {
+    List<ApplicationClusterEndpoint> endpoints();
+}
diff --git a/config-model-api/src/main/java/com/yahoo/config/model/api/Model.java b/config-model-api/src/main/java/com/yahoo/config/model/api/Model.java
index c1248ff556c..a7fd48bfea8 100644
--- a/config-model-api/src/main/java/com/yahoo/config/model/api/Model.java
+++ b/config-model-api/src/main/java/com/yahoo/config/model/api/Model.java
@@ -79,4 +79,6 @@ public interface Model {
     /** Returns the set of document types in each cluster, that have an index for one of more fields. */
     default Map<String, Set<String>> indexedDocumentTypesByCluster() { return Map.of(); }
 
+    /** Returns the set of container clusters */
+    default Set<ApplicationClusterInfo> applicationClusterInfo() { return Set.of(); }
 }
diff --git a/config-model-api/src/main/java/com/yahoo/config/model/api/ModelContext.java b/config-model-api/src/main/java/com/yahoo/config/model/api/ModelContext.java
index ff612ffc2b0..c5781c2805d 100644
--- a/config-model-api/src/main/java/com/yahoo/config/model/api/ModelContext.java
+++ b/config-model-api/src/main/java/com/yahoo/config/model/api/ModelContext.java
@@ -148,6 +148,8 @@ public interface ModelContext {
         default List<X509Certificate> operatorCertificates() { return List.of(); }
 
         default List<String> tlsCiphersOverride() { return List.of(); }
+
+        default List<String> zoneDnsSuffixes() { return List.of(); }
     }
 
     @Retention(RetentionPolicy.RUNTIME)