Add support for client id command

src/main/java/io/lettuce/core/AbstractRedisAsyncCommands.java

@@ -182,6 +182,11 @@ public RedisFuture<String> clientList() {
         return dispatch(commandBuilder.clientList());
     }
 
+    @Override
+    public RedisFuture<Long> clientId() {
+        return dispatch(commandBuilder.clientId());
+    }
+
     @Override
     public RedisFuture<String> clientPause(long timeout) {
         return dispatch(commandBuilder.clientPause(timeout));

src/main/java/io/lettuce/core/AbstractRedisReactiveCommands.java

@@ -205,6 +205,11 @@ public Mono<String> clientList() {
         return createMono(commandBuilder::clientList);
     }
 
+    @Override
+    public Mono<Long> clientId() {
+        return createMono(commandBuilder::clientId);
+    }
+
     @Override
     public Mono<String> clientPause(long timeout) {
         return createMono(() -> commandBuilder.clientPause(timeout));

src/main/java/io/lettuce/core/RedisCommandBuilder.java

@@ -237,6 +237,11 @@ Command<K, V, String> clientList() {
         return createCommand(CLIENT, new StatusOutput<>(codec), args);
     }
 
+    Command<K, V, Long> clientId() {
+        CommandArgs<K, V> args = new CommandArgs<>(codec).add(ID);
+        return createCommand(CLIENT, new IntegerOutput<>(codec), args);
+    }
+
     Command<K, V, String> clientPause(long timeout) {
         CommandArgs<K, V> args = new CommandArgs<>(codec).add(PAUSE).add(timeout);
         return createCommand(CLIENT, new StatusOutput<>(codec), args);

src/main/java/io/lettuce/core/api/async/RedisServerAsyncCommands.java

@@ -106,6 +106,13 @@ public interface RedisServerAsyncCommands<K, V> {
      */
     RedisFuture<String> clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    RedisFuture<Long> clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/main/java/io/lettuce/core/api/reactive/RedisServerReactiveCommands.java

@@ -106,6 +106,13 @@ public interface RedisServerReactiveCommands<K, V> {
      */
     Mono<String> clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    Mono<Long> clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/main/java/io/lettuce/core/api/sync/RedisServerCommands.java

@@ -105,6 +105,13 @@ public interface RedisServerCommands<K, V> {
      */
     String clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    Long clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/main/java/io/lettuce/core/cluster/api/async/NodeSelectionServerAsyncCommands.java

@@ -105,6 +105,13 @@ public interface NodeSelectionServerAsyncCommands<K, V> {
      */
     AsyncExecutions<String> clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    AsyncExecutions<Long> clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/main/java/io/lettuce/core/cluster/api/sync/NodeSelectionServerCommands.java

@@ -105,6 +105,13 @@ public interface NodeSelectionServerCommands<K, V> {
      */
     Executions<String> clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    Executions<Long> clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/main/templates/io/lettuce/core/api/RedisServerCommands.java

@@ -104,6 +104,13 @@ public interface RedisServerCommands<K, V> {
      */
     String clientList();
 
+    /**
+     * Get the id of the current connection.
+     *
+     * @return Long The command just returns the ID of the current connection. Every connection ID has certain guarantees
+     */
+    Long clientId();
+
     /**
      * Returns an array reply of details about all Redis commands.
      *

src/test/java/io/lettuce/core/commands/ServerCommandIntegrationTests.java

@@ -167,6 +167,11 @@ void clientUnblock() throws InterruptedException {
         assertThat(blocked.getError()).contains("UNBLOCKED client unblocked");
     }
 
+    @Test
+    void clientId() {
+        assertThat(redis.clientId()).isNotNull();
+    }
+
     @Test
     void commandCount() {
         assertThat(redis.commandCount()).isGreaterThan(100);