add client trackinginfo command

Author: Cem Asma

Diff for: src/main/java/redis/clients/jedis/Jedis.java

@@ -4325,6 +4325,13 @@ public String clientNoTouchOff() {
     return connection.getStatusCodeReply();
   }
 
+  @Override
+  public TrackingInfo clientTrackingInfo() {
+    checkIsInMultiOrPipeline();
+    connection.sendCommand(CLIENT, "TRACKINGINFO");
+    return TrackingInfo.TRACKING_INFO_BUILDER.build(connection.getOne());
+  }
+
   public List<String> time() {
     checkIsInMultiOrPipeline();
     connection.sendCommand(Command.TIME);

Diff for: src/main/java/redis/clients/jedis/commands/ClientCommands.java

@@ -5,6 +5,7 @@
 import redis.clients.jedis.args.ClientType;
 import redis.clients.jedis.args.UnblockType;
 import redis.clients.jedis.params.ClientKillParams;
+import redis.clients.jedis.resps.TrackingInfo;
 
 /**
  * The interface contain all the commands about client.
@@ -170,4 +171,6 @@ public interface ClientCommands {
    * @return OK
    */
   String clientNoTouchOff();
+
+  TrackingInfo clientTrackingInfo();
 }

Diff for: src/main/java/redis/clients/jedis/resps/TrackingInfo.java

@@ -0,0 +1,70 @@
+package redis.clients.jedis.resps;
+
+import redis.clients.jedis.Builder;
+import redis.clients.jedis.util.KeyValue;
+
+import java.util.Collections;
+import java.util.List;
+
+import static redis.clients.jedis.BuilderFactory.*;
+
+public class TrackingInfo {
+
+    private final List<String> flags;
+    private final long redirect;
+    private final List<String> prefixes;
+
+    public TrackingInfo(List<String> flags, long redirect, List<String> prefixes) {
+        this.flags = flags;
+        this.redirect = redirect;
+        this.prefixes = prefixes;
+    }
+
+
+    public List<String> getFlags() {
+        return flags;
+    }
+
+    public long getRedirect() {
+        return redirect;
+    }
+
+    public List<String> getPrefixes() {
+        return prefixes;
+    }
+
+    public static final Builder<TrackingInfo> TRACKING_INFO_BUILDER = new Builder<TrackingInfo>() {
+        @Override
+        public TrackingInfo build(Object data) {
+            List commandData = (List) data;
+
+            if (commandData.get(0) instanceof KeyValue) {
+                List<String> flags = Collections.emptyList();
+                long redirect = -1;
+                List<String> prefixes = Collections.emptyList();
+
+                for (KeyValue kv : (List<KeyValue>) commandData) {
+                    switch (STRING.build(kv.getKey())) {
+                        case "flags":
+                            flags = STRING_LIST.build(kv.getValue());
+                            break;
+                        case "redirect":
+                            redirect = LONG.build(kv.getValue());
+                            break;
+                        case "prefixes":
+                            prefixes = STRING_LIST.build(kv.getValue());
+                            break;
+                    }
+                }
+
+                return new TrackingInfo(flags, redirect, prefixes);
+            } else {
+                List<String> flags = STRING_LIST.build(commandData.get(1));
+                long redirect = LONG.build(commandData.get(3));
+                List<String> prefixes = STRING_LIST.build(commandData.get(5));
+
+                return new TrackingInfo(flags, redirect, prefixes);
+            }
+        }
+    };
+}

Diff for: src/test/java/redis/clients/jedis/commands/jedis/ClientCommandsTest.java

@@ -19,12 +19,15 @@
 import org.junit.Before;
 import org.junit.Test;
 
+import redis.clients.jedis.DefaultJedisClientConfig;
 import redis.clients.jedis.Jedis;
+import redis.clients.jedis.RedisProtocol;
 import redis.clients.jedis.args.ClientAttributeOption;
 import redis.clients.jedis.args.ClientType;
 import redis.clients.jedis.args.UnblockType;
 import redis.clients.jedis.exceptions.JedisConnectionException;
 import redis.clients.jedis.params.ClientKillParams;
+import redis.clients.jedis.resps.TrackingInfo;
 
 public class ClientCommandsTest extends JedisCommandsTestBase {
 
@@ -279,6 +282,26 @@ public void listWithType() {
     assertEquals(1, client.clientList(ClientType.PUBSUB).split("\\n").length);
   }
 
+  @Test
+  public void trackingInfo() {
+    TrackingInfo trackingInfo = client.clientTrackingInfo();
+
+    assertEquals(1, trackingInfo.getFlags().size());
+    assertEquals(-1, trackingInfo.getRedirect());
+    assertEquals(0, trackingInfo.getPrefixes().size());
+  }
+
+  @Test
+  public void trackingInfoResp3() {
+    Jedis clientResp3 = new Jedis(hnp, DefaultJedisClientConfig.builder()
+            .protocol(RedisProtocol.RESP3).password("foobared").build());
+    TrackingInfo trackingInfo = clientResp3.clientTrackingInfo();
+
+    assertEquals(1, trackingInfo.getFlags().size());
+    assertEquals(-1, trackingInfo.getRedirect());
+    assertEquals(0, trackingInfo.getPrefixes().size());
+  }
+
   private void assertDisconnected(Jedis j) {
     try {
       j.ping();