SOLR-16398: Add V2 JAX-RS API for replication details

changelog/unreleased/SOLR-16398-replication-phase1.yml

@@ -0,0 +1,9 @@
+title:
+   Add V2 JAX-RS API for replication details (GET /api/cores/{coreName}/replication)
+type: added
+authors:
+  - name: Jalaz Kumar
+    nick: jaykay12
+links:
+  - name: SOLR-16398
+    url: https://issues.apache.org/jira/browse/SOLR-16398

solr/api/src/java/org/apache/solr/client/api/endpoint/ReplicationApis.java

@@ -31,11 +31,26 @@
 import java.io.IOException;
 import org.apache.solr.client.api.model.FileListResponse;
 import org.apache.solr.client.api.model.IndexVersionResponse;
+import org.apache.solr.client.api.model.ReplicationDetailsResponse;
 import org.apache.solr.client.api.util.CoreApiParameters;
 
 @Path("/cores/{coreName}/replication")
 public interface ReplicationApis {
 
+  @GET
+  @CoreApiParameters
+  @Path("/details")
+  @Operation(
+      summary = "Return replication configuration and current status.",
+      tags = {"replication"})
+  ReplicationDetailsResponse fetchReplicationDetails(
+      @Parameter(
+              description = "When true on a follower, include nested details fetched from leader",
+              required = false)
+          @QueryParam("follower")
+          @DefaultValue("true")
+          Boolean follower);
+
   @GET
   @CoreApiParameters
   @Path("/indexversion")

solr/api/src/java/org/apache/solr/client/api/model/ReplicationDetailsResponse.java

@@ -0,0 +1,207 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.client.api.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import io.swagger.v3.oas.annotations.media.Schema;
+import java.util.List;
+import org.apache.solr.client.api.util.ReflectWritable;
+
+public class ReplicationDetailsResponse extends SolrJerseyResponse {
+
+  @JsonProperty("status")
+  @Schema(description = "Request status, typically OK")
+  public String status;
+
+  @JsonProperty("details")
+  @Schema(description = "Replication configuration and status details")
+  public ReplicationDetails details;
+
+  public ReplicationDetailsResponse() {}
+
+  public ReplicationDetailsResponse(ReplicationDetails details, String status) {
+    this.details = details;
+    this.status = status;
+  }
+
+  /** Top-level replication details payload (nested under {@code details} in the response). */
+  public static class ReplicationDetails implements ReflectWritable {
+    @JsonProperty("indexSize")
+    public String indexSize;
+
+    @JsonProperty("indexPath")
+    public String indexPath;
+
+    @JsonProperty("commits")
+    public List<CommitDetails> commits;
+
+    @JsonProperty("isLeader")
+    public boolean isLeader;
+
+    @JsonProperty("isFollower")
+    public boolean isFollower;
+
+    @JsonProperty("indexVersion")
+    public Long indexVersion;
+
+    @JsonProperty("generation")
+    public Long generation;
+
+    @JsonProperty("leader")
+    public LeaderDetails leader;
+
+    @JsonProperty("follower")
+    public FollowerDetails follower;
+
+    /** Optional snapshot/backup stats (heterogeneous NamedList from the handler). */
+    @JsonProperty("backup")
+    public Object backup;
+  }
+
+  public static class CommitDetails implements ReflectWritable {
+    @JsonProperty("indexVersion")
+    public Long indexVersion;
+
+    @JsonProperty("generation")
+    public Long generation;
+
+    @JsonProperty("filelist")
+    public List<String> filelist;
+  }
+
+  public static class LeaderDetails implements ReflectWritable {
+    @JsonProperty("confFiles")
+    public String confFiles;
+
+    @JsonProperty("replicateAfter")
+    public List<String> replicateAfter;
+
+    @JsonProperty("replicationEnabled")
+    public boolean replicationEnabled;
+
+    @JsonProperty("replicableVersion")
+    public Long replicableVersion;
+
+    @JsonProperty("replicableGeneration")
+    public Long replicableGeneration;
+  }
+
+  public static class FollowerDetails implements ReflectWritable {
+    /** Nested leader details (remote NamedList or map), present when follower=true. */
+    @JsonProperty("leaderDetails")
+    public Object leaderDetails;
+
+    @JsonProperty("ERROR")
+    public String error;
+
+    @JsonProperty("leaderUrl")
+    public String leaderUrl;
+
+    @JsonProperty("pollInterval")
+    public String pollInterval;
+
+    @JsonProperty("nextExecutionAt")
+    public String nextExecutionAt;
+
+    @JsonProperty("indexReplicatedAt")
+    public String indexReplicatedAt;
+
+    @JsonProperty("indexReplicatedAtList")
+    public List<String> indexReplicatedAtList;
+
+    @JsonProperty("replicationFailedAtList")
+    public List<String> replicationFailedAtList;
+
+    @JsonProperty("timesIndexReplicated")
+    public Integer timesIndexReplicated;
+
+    @JsonProperty("confFilesReplicated")
+    public String confFilesReplicated;
+
+    @JsonProperty("timesConfigReplicated")
+    public Integer timesConfigReplicated;
+
+    @JsonProperty("confFilesReplicatedAt")
+    public String confFilesReplicatedAt;
+
+    @JsonProperty("lastCycleBytesDownloaded")
+    public Long lastCycleBytesDownloaded;
+
+    @JsonProperty("timesFailed")
+    public Integer timesFailed;
+
+    @JsonProperty("replicationFailedAt")
+    public String replicationFailedAt;
+
+    @JsonProperty("previousCycleTimeInSeconds")
+    public Long previousCycleTimeInSeconds;
+
+    @JsonProperty("currentDate")
+    public String currentDate;
+
+    @JsonProperty("isPollingDisabled")
+    public boolean isPollingDisabled;
+
+    @JsonProperty("isReplicating")
+    public boolean isReplicating;
+
+    @JsonProperty("filesToDownload")
+    public List<String> filesToDownload;
+
+    @JsonProperty("numFilesToDownload")
+    public String numFilesToDownload;
+
+    @JsonProperty("bytesToDownload")
+    public String bytesToDownload;
+
+    @JsonProperty("filesDownloaded")
+    public List<String> filesDownloaded;
+
+    @JsonProperty("numFilesDownloaded")
+    public String numFilesDownloaded;
+
+    @JsonProperty("replicationStartTime")
+    public String replicationStartTime;
+
+    @JsonProperty("timeElapsed")
+    public String timeElapsed;
+
+    @JsonProperty("currentFile")
+    public String currentFile;
+
+    @JsonProperty("currentFileSize")
+    public String currentFileSize;
+
+    @JsonProperty("currentFileSizeDownloaded")
+    public String currentFileSizeDownloaded;
+
+    @JsonProperty("currentFileSizePercent")
+    public String currentFileSizePercent;
+
+    @JsonProperty("bytesDownloaded")
+    public String bytesDownloaded;
+
+    @JsonProperty("totalPercent")
+    public String totalPercent;
+
+    @JsonProperty("timeRemaining")
+    public String timeRemaining;
+
+    @JsonProperty("downloadSpeed")
+    public String downloadSpeed;
+  }
+}