xds route and lb util

Signed-off-by: daizhenyu <1449308021@qq.com>

sermant-agentcore/sermant-agentcore-implement/src/main/java/io/sermant/implement/service/xds/utils/CdsProtocolTransformer.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2024-2024 Sermant Authors. All rights reserved.
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package io.sermant.implement.service.xds.utils;
+
+import io.envoyproxy.envoy.config.cluster.v3.Cluster;
+import io.envoyproxy.envoy.config.cluster.v3.Cluster.LbPolicy;
+import io.sermant.core.service.xds.entity.XdsCluster;
+import io.sermant.core.service.xds.entity.XdsLbPolicy;
+import io.sermant.core.service.xds.entity.XdsServiceCluster;
+import io.sermant.core.utils.StringUtils;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Convert cds protocol data to Sermant data model
+ *
+ * @author daizhenyu
+ * @since 2024-08-22
+ **/
+public class CdsProtocolTransformer {
+    private static final int CLUSTER_SUBSET_INDEX = 2;
+
+    private static final String VERTICAL_LINE_SEPARATOR = "\\|";
+
+    private static final Map<LbPolicy, XdsLbPolicy> LB_POLICY_MAPPING = new HashMap<>();
+
+    {
+        LB_POLICY_MAPPING.put(LbPolicy.RANDOM, XdsLbPolicy.RANDOM);
+        LB_POLICY_MAPPING.put(LbPolicy.ROUND_ROBIN, XdsLbPolicy.ROUND_ROBIN);
+        LB_POLICY_MAPPING.put(LbPolicy.LEAST_REQUEST, XdsLbPolicy.LEAST_REQUEST);
+        LB_POLICY_MAPPING.put(LbPolicy.RING_HASH, XdsLbPolicy.RING_HASH);
+        LB_POLICY_MAPPING.put(LbPolicy.MAGLEV, XdsLbPolicy.MAGLEV);
+    }
+
+    private CdsProtocolTransformer() {
+    }
+
+    /**
+     * get the mapping between service name of k8s and cluster of istio
+     *
+     * @param clusters clusters
+     * @return XdsServiceCluster map
+     */
+    public static Map<String, XdsServiceCluster> getServiceClusters(List<Cluster> clusters) {
+        Map<String, Set<XdsCluster>> xdsClusters = clusters.stream()
+                .filter(Objects::nonNull)
+                .map(cluster -> parseCluster(cluster))
+                .filter(xdsCluster -> !StringUtils.isEmpty(xdsCluster.getServiceName()))
+                .collect(Collectors.groupingBy(
+                        XdsCluster::getServiceName,
+                        Collectors.toSet()
+                ));
+        Map<String, XdsServiceCluster> xdsServiceClusterMap = new HashMap<>();
+        for (Entry<String, Set<XdsCluster>> clusterEntry : xdsClusters.entrySet()) {
+            XdsServiceCluster serviceCluster = new XdsServiceCluster();
+            serviceCluster.setBaseClusterName(getServiceBaseClusterName(clusterEntry.getValue()));
+            Map<String, XdsCluster> clusterMap = clusterEntry.getValue().stream()
+                    .collect(Collectors.toMap(
+                            XdsCluster::getClusterName,
+                            xdsCluster -> xdsCluster
+                    ));
+            serviceCluster.setClusters(clusterMap);
+            xdsServiceClusterMap.put(clusterEntry.getKey(), serviceCluster);
+        }
+        return xdsServiceClusterMap;
+    }
+
+    private static XdsCluster parseCluster(Cluster cluster) {
+        XdsCluster xdsCluster = new XdsCluster();
+        Optional<String> serviceNameFromCluster = XdsCommonUtils.getServiceNameFromCluster(cluster.getName());
+        if (!serviceNameFromCluster.isPresent()) {
+            return xdsCluster;
+        }
+        xdsCluster.setClusterName(cluster.getName());
+        xdsCluster.setServiceName(serviceNameFromCluster.get());
+        xdsCluster.setLocalityLb(cluster.getCommonLbConfig().hasLocalityWeightedLbConfig());
+        xdsCluster.setLbPolicy(parseClusterLbPolicy(cluster.getLbPolicy()));
+        return xdsCluster;
+    }
+
+    private static String getServiceBaseClusterName(Set<XdsCluster> xdsClusters) {
+        for (XdsCluster cluster : xdsClusters) {
+            String clusterName = cluster.getClusterName();
+            String[] splitCluster = clusterName.split(VERTICAL_LINE_SEPARATOR);
+            if (splitCluster[CLUSTER_SUBSET_INDEX].equals(StringUtils.EMPTY)) {
+                return clusterName;
+            }
+        }
+        return StringUtils.EMPTY;
+    }
+
+    private static XdsLbPolicy parseClusterLbPolicy(LbPolicy lbPolicy) {
+        return LB_POLICY_MAPPING.getOrDefault(lbPolicy, XdsLbPolicy.UNRECOGNIZED);
+    }
+}

sermant-agentcore/sermant-agentcore-implement/src/main/java/io/sermant/implement/service/xds/utils/LdsProtocolTransformer.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2024-2024 Sermant Authors. All rights reserved.
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package io.sermant.implement.service.xds.utils;
+
+import com.google.protobuf.Any;
+import com.google.protobuf.InvalidProtocolBufferException;
+
+import io.envoyproxy.envoy.config.listener.v3.Filter;
+import io.envoyproxy.envoy.config.listener.v3.Listener;
+import io.envoyproxy.envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager;
+import io.sermant.core.common.LoggerFactory;
+import io.sermant.core.service.xds.entity.XdsHttpConnectionManager;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+
+/**
+ * Convert lds protocol data to Sermant data model
+ *
+ * @author daizhenyu
+ * @since 2024-08-22
+ **/
+public class LdsProtocolTransformer {
+    private static final Logger LOGGER = LoggerFactory.getLogger();
+
+    private LdsProtocolTransformer() {
+    }
+
+    /**
+     * get HttpConnectionManager
+     *
+     * @param listeners listeners
+     * @return HttpConnectionManager list
+     */
+    public static List<XdsHttpConnectionManager> getHttpConnectionManager(List<Listener> listeners) {
+        return listeners.stream()
+                .filter(Objects::nonNull)
+                .flatMap(listener -> listener.getFilterChainsList().stream())
+                .flatMap(e -> e.getFiltersList().stream())
+                .map(Filter::getTypedConfig)
+                .map(LdsProtocolTransformer::unpackHttpConnectionManager)
+                .filter(Optional::isPresent)
+                .map(Optional::get)
+                .map(httpConnectionManager -> {
+                    XdsHttpConnectionManager xdsHcm = new XdsHttpConnectionManager();
+                    xdsHcm.setRouteConfigName(httpConnectionManager.getRds().getRouteConfigName());
+                    return xdsHcm;
+                })
+                .collect(Collectors.toList());
+    }
+
+    private static Optional<HttpConnectionManager> unpackHttpConnectionManager(Any any) {
+        try {
+            if (!any.is(HttpConnectionManager.class)) {
+                return Optional.empty();
+            }
+            return Optional.of(any.unpack(HttpConnectionManager.class));
+        } catch (InvalidProtocolBufferException e) {
+            LOGGER.log(Level.SEVERE, "Decode resource to HttpConnectionManager failed.", e);
+            return Optional.empty();
+        }
+    }
+}