Java: Add FCALL command.

glide-core/src/protobuf/redis_request.proto

@@ -193,6 +193,7 @@ enum RequestType {
     FunctionList = 151;
     FunctionDelete = 152;
     FunctionFlush = 153;
+    FCall = 154;
     LMPop = 155;
     ExpireTime = 156;
     PExpireTime = 157;

glide-core/src/request_type.rs

@@ -163,6 +163,7 @@ pub enum RequestType {
     FunctionList = 151,
     FunctionDelete = 152,
     FunctionFlush = 153,
+    FCall = 154,
     LMPop = 155,
     ExpireTime = 156,
     PExpireTime = 157,
@@ -346,6 +347,7 @@ impl From<::protobuf::EnumOrUnknown<ProtobufRequestType>> for RequestType {
             ProtobufRequestType::FunctionList => RequestType::FunctionList,
             ProtobufRequestType::FunctionDelete => RequestType::FunctionDelete,
             ProtobufRequestType::FunctionFlush => RequestType::FunctionFlush,
+            ProtobufRequestType::FCall => RequestType::FCall,
             ProtobufRequestType::BitPos => RequestType::BitPos,
             ProtobufRequestType::BitOp => RequestType::BitOp,
             ProtobufRequestType::HStrlen => RequestType::HStrlen,
@@ -526,6 +528,7 @@ impl RequestType {
             RequestType::FunctionList => Some(get_two_word_command("FUNCTION", "LIST")),
             RequestType::FunctionDelete => Some(get_two_word_command("FUNCTION", "DELETE")),
             RequestType::FunctionFlush => Some(get_two_word_command("FUNCTION", "FLUSH")),
+            RequestType::FCall => Some(cmd("FCALL")),
             RequestType::BitPos => Some(cmd("BITPOS")),
             RequestType::BitOp => Some(cmd("BITOP")),
             RequestType::HStrlen => Some(cmd("HSTRLEN")),

java/client/src/main/java/glide/api/BaseClient.java

@@ -34,6 +34,7 @@
 import static redis_request.RedisRequestOuterClass.RequestType.Expire;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireAt;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireTime;
+import static redis_request.RedisRequestOuterClass.RequestType.FCall;
 import static redis_request.RedisRequestOuterClass.RequestType.GeoAdd;
 import static redis_request.RedisRequestOuterClass.RequestType.GeoDist;
 import static redis_request.RedisRequestOuterClass.RequestType.GeoHash;
@@ -152,6 +153,7 @@
 import glide.api.commands.HashBaseCommands;
 import glide.api.commands.HyperLogLogBaseCommands;
 import glide.api.commands.ListBaseCommands;
+import glide.api.commands.ScriptingAndFunctionsBaseCommands;
 import glide.api.commands.SetBaseCommands;
 import glide.api.commands.SortedSetBaseCommands;
 import glide.api.commands.StreamBaseCommands;
@@ -220,7 +222,8 @@ public abstract class BaseClient
                 SortedSetBaseCommands,
                 StreamBaseCommands,
                 HyperLogLogBaseCommands,
-                GeospatialIndicesBaseCommands {
+                GeospatialIndicesBaseCommands,
+                ScriptingAndFunctionsBaseCommands {
 
     /** Redis simple string response with "OK" */
     public static final String OK = ConstantResponse.OK.toString();
@@ -1750,6 +1753,14 @@ public CompletableFuture<Long> sintercard(@NonNull String[] keys, long limit) {
         return commandManager.submitNewCommand(SInterCard, arguments, this::handleLongResponse);
     }
 
+    @Override
+    public CompletableFuture<Object> fcall(
+            @NonNull String function, @NonNull String[] keys, @NonNull String[] arguments) {
+        String[] args =
+                concatenateArrays(new String[] {function, Long.toString(keys.length)}, keys, arguments);
+        return commandManager.submitNewCommand(FCall, args, this::handleObjectOrNullResponse);
+    }
+
     @Override
     public CompletableFuture<Boolean> copy(
             @NonNull String source, @NonNull String destination, boolean replace) {

java/client/src/main/java/glide/api/RedisClient.java

@@ -254,6 +254,11 @@ public CompletableFuture<String> functionDelete(@NonNull String libName) {
                 FunctionDelete, new String[] {libName}, this::handleStringResponse);
     }
 
+    @Override
+    public CompletableFuture<Object> fcall(@NonNull String function) {
+        return fcall(function, new String[0], new String[0]);
+    }
+
     @Override
     public CompletableFuture<Boolean> copy(
             @NonNull String source, @NonNull String destination, long destinationDB) {

java/client/src/main/java/glide/api/RedisClusterClient.java

@@ -18,6 +18,7 @@
 import static redis_request.RedisRequestOuterClass.RequestType.CustomCommand;
 import static redis_request.RedisRequestOuterClass.RequestType.DBSize;
 import static redis_request.RedisRequestOuterClass.RequestType.Echo;
+import static redis_request.RedisRequestOuterClass.RequestType.FCall;
 import static redis_request.RedisRequestOuterClass.RequestType.FlushAll;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionDelete;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionFlush;
@@ -543,4 +544,35 @@ public CompletableFuture<String> functionDelete(@NonNull String libName, @NonNul
         return commandManager.submitNewCommand(
                 FunctionDelete, new String[] {libName}, route, this::handleStringResponse);
     }
+
+    @Override
+    public CompletableFuture<Object> fcall(@NonNull String function) {
+        return fcall(function, new String[0]);
+    }
+
+    @Override
+    public CompletableFuture<ClusterValue<Object>> fcall(
+            @NonNull String function, @NonNull Route route) {
+        return fcall(function, new String[0], route);
+    }
+
+    @Override
+    public CompletableFuture<Object> fcall(@NonNull String function, @NonNull String[] arguments) {
+        String[] args = concatenateArrays(new String[] {function, "0"}, arguments); // 0 - key count
+        return commandManager.submitNewCommand(FCall, args, this::handleObjectOrNullResponse);
+    }
+
+    @Override
+    public CompletableFuture<ClusterValue<Object>> fcall(
+            @NonNull String function, @NonNull String[] arguments, @NonNull Route route) {
+        String[] args = concatenateArrays(new String[] {function, "0"}, arguments); // 0 - key count
+        return commandManager.submitNewCommand(
+                FCall,
+                args,
+                route,
+                response ->
+                        route instanceof SingleNodeRoute
+                                ? ClusterValue.ofSingleValue(handleObjectOrNullResponse(response))
+                                : ClusterValue.ofMultiValue(handleMapResponse(response)));
+    }
 }

java/client/src/main/java/glide/api/commands/ScriptingAndFunctionsBaseCommands.java

@@ -0,0 +1,41 @@
+/** Copyright GLIDE-for-Redis Project Contributors - SPDX Identifier: Apache-2.0 */
+package glide.api.commands;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Supports commands and transactions for the "Scripting and Function" group for standalone and
+ * cluster clients.
+ *
+ * @see <a href="https://redis.io/docs/latest/commands/?group=scripting">Scripting and Function
+ *     Commands</a>
+ */
+public interface ScriptingAndFunctionsBaseCommands {
+
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @apiNote When in cluster mode
+     *     <ul>
+     *       <li>all <code>keys</code> must map to the same hash slot.
+     *       <li>if no <code>keys</code> are given, command will be routed to a random node.
+     *     </ul>
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param keys An <code>array</code> of keys accessed by the function. To ensure the correct
+     *     execution of functions, both in standalone and clustered deployments, all names of keys
+     *     that a function accesses must be explicitly provided as <code>keys</code>.
+     * @param arguments An <code>array</code> of <code>function</code> arguments. <code>Arguments
+     *     </code> should not represent names of keys.
+     * @return The invoked function's return value.
+     * @example
+     *     <pre>{@code
+     * String[] args = new String[] { "Answer", "to", "the", "Ultimate", "Question", "of", "Life,", "the", "Universe,", "and", "Everything"};
+     * Object response = client.fcall("Deep_Thought", new String[0], args).get();
+     * assert response == 42L;
+     * }</pre>
+     */
+    CompletableFuture<Object> fcall(String function, String[] keys, String[] arguments);
+}

java/client/src/main/java/glide/api/commands/ScriptingAndFunctionsClusterCommands.java

@@ -265,4 +265,78 @@ CompletableFuture<ClusterValue<Map<String, Object>[]>> functionList(
      * }</pre>
      */
     CompletableFuture<String> functionDelete(String libName, Route route);
+
+    /**
+     * Invokes a previously loaded function.<br>
+     * The command will be routed to a random node.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @return The invoked function's return value.
+     * @example
+     *     <pre>{@code
+     * Object response = client.fcall("Deep_Thought").get();
+     * assert response == 42L;
+     * }</pre>
+     */
+    CompletableFuture<Object> fcall(String function);
+
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param route Specifies the routing configuration for the command. The client will route the
+     *     command to the nodes defined by <code>route</code>.
+     * @return The invoked function's return value wrapped by a {@link ClusterValue}.
+     * @example
+     *     <pre>{@code
+     * ClusterValue<Object> response = client.fcall("Deep_Thought", ALL_NODES).get();
+     * for (Object nodeResponse : response.getMultiValue().values()) {
+     *   assert nodeResponse == 42L;
+     * }
+     * }</pre>
+     */
+    CompletableFuture<ClusterValue<Object>> fcall(String function, Route route);
+
+    /**
+     * Invokes a previously loaded function.<br>
+     * The command will be routed to a random node.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param arguments An <code>array</code> of <code>function</code> arguments. <code>Arguments
+     *     </code> should not represent names of keys.
+     * @return The invoked function's return value.
+     * @example
+     *     <pre>{@code
+     * String[] args = new String[] { "Answer", "to", "the", "Ultimate", "Question", "of", "Life,", "the", "Universe,", "and", "Everything" };
+     * Object response = client.fcall("Deep_Thought", args).get();
+     * assert response == 42L;
+     * }</pre>
+     */
+    CompletableFuture<Object> fcall(String function, String[] arguments);
+
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param arguments An <code>array</code> of <code>function</code> arguments. <code>Arguments
+     *     </code> should not represent names of keys.
+     * @param route Specifies the routing configuration for the command. The client will route the
+     *     command to the nodes defined by <code>route</code>.
+     * @return The invoked function's return value wrapped by a {@link ClusterValue}.
+     * @example
+     *     <pre>{@code
+     * String[] args = new String[] { "Answer", "to", "the", "Ultimate", "Question", "of", "Life,", "the", "Universe,", "and", "Everything" };
+     * ClusterValue<Object> response = client.fcall("Deep_Thought", args, RANDOM).get();
+     * assert response.getSingleValue() == 42L;
+     * }</pre>
+     */
+    CompletableFuture<ClusterValue<Object>> fcall(String function, String[] arguments, Route route);
 }

java/client/src/main/java/glide/api/commands/ScriptingAndFunctionsCommands.java

@@ -6,8 +6,8 @@
 import java.util.concurrent.CompletableFuture;
 
 /**
- * Supports commands and transactions for the "Scripting and Function" group for standalone and
- * cluster clients.
+ * Supports commands and transactions for the "Scripting and Function" group for a standalone
+ * client.
  *
  * @see <a href="https://redis.io/docs/latest/commands/?group=scripting">Scripting and Function
  *     Commands</a>
@@ -127,4 +127,19 @@ public interface ScriptingAndFunctionsCommands {
      * }</pre>
      */
     CompletableFuture<String> functionDelete(String libName);
+
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @return The invoked function's return value.
+     * @example
+     *     <pre>{@code
+     * Object response = client.fcall("Deep_Thought").get();
+     * assert response == 42L;
+     * }</pre>
+     */
+    CompletableFuture<Object> fcall(String function);
 }

java/client/src/main/java/glide/api/models/BaseTransaction.java

@@ -49,6 +49,7 @@
 import static redis_request.RedisRequestOuterClass.RequestType.Expire;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireAt;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireTime;
+import static redis_request.RedisRequestOuterClass.RequestType.FCall;
 import static redis_request.RedisRequestOuterClass.RequestType.FlushAll;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionDelete;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionFlush;
@@ -3707,6 +3708,42 @@ public T functionList(@NonNull String libNamePattern, boolean withCode) {
         return getThis();
     }
 
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param keys An <code>array</code> of key arguments accessed by the function. To ensure the
+     *     correct execution of functions, both in standalone and clustered deployments, all names of
+     *     keys that a function accesses must be explicitly provided as <code>keys</code>.
+     * @param arguments An <code>array</code> of <code>function</code> arguments. <code>Arguments
+     *     </code> should not represent names of keys.
+     * @return Command Response - The invoked function's return value.
+     */
+    public T fcall(@NonNull String function, @NonNull String[] keys, @NonNull String[] arguments) {
+        ArgsArray commandArgs =
+                buildArgs(
+                        concatenateArrays(
+                                new String[] {function, Long.toString(keys.length)}, keys, arguments));
+        protobufTransaction.addCommands(buildCommand(FCall, commandArgs));
+        return getThis();
+    }
+
+    /**
+     * Invokes a previously loaded function.
+     *
+     * @since Redis 7.0 and above.
+     * @see <a href="https://redis.io/docs/latest/commands/fcall/">redis.io</a> for details.
+     * @param function The function name.
+     * @param arguments An <code>array</code> of <code>function</code> arguments. <code>Arguments
+     *     </code> should not represent names of keys.
+     * @return Command Response - The invoked function's return value.
+     */
+    public T fcall(@NonNull String function, @NonNull String[] arguments) {
+        return fcall(function, new String[0], arguments);
+    }
+
     /**
      * Sets or clears the bit at <code>offset</code> in the string value stored at <code>key</code>.
      * The <code>offset</code> is a zero-based index, with <code>0</code> being the first element of

java/client/src/test/java/glide/api/RedisClientTest.java

@@ -81,6 +81,7 @@
 import static redis_request.RedisRequestOuterClass.RequestType.Expire;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireAt;
 import static redis_request.RedisRequestOuterClass.RequestType.ExpireTime;
+import static redis_request.RedisRequestOuterClass.RequestType.FCall;
 import static redis_request.RedisRequestOuterClass.RequestType.FlushAll;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionDelete;
 import static redis_request.RedisRequestOuterClass.RequestType.FunctionFlush;
@@ -5087,6 +5088,52 @@ public void functionDelete_returns_success() {
         assertEquals(OK, payload);
     }
 
+    @SneakyThrows
+    @Test
+    public void fcall_with_keys_and_args_returns_success() {
+        // setup
+        String function = "func";
+        String[] keys = new String[] {"key1", "key2"};
+        String[] arguments = new String[] {"1", "2"};
+        String[] args = new String[] {function, "2", "key1", "key2", "1", "2"};
+        Object value = "42";
+        CompletableFuture<Object> testResponse = new CompletableFuture<>();
+        testResponse.complete(value);
+
+        // match on protobuf request
+        when(commandManager.submitNewCommand(eq(FCall), eq(args), any())).thenReturn(testResponse);
+
+        // exercise
+        CompletableFuture<Object> response = service.fcall(function, keys, arguments);
+        Object payload = response.get();
+
+        // verify
+        assertEquals(testResponse, response);
+        assertEquals(value, payload);
+    }
+
+    @SneakyThrows
+    @Test
+    public void fcall_returns_success() {
+        // setup
+        String function = "func";
+        String[] args = new String[] {function, "0"};
+        Object value = "42";
+        CompletableFuture<Object> testResponse = new CompletableFuture<>();
+        testResponse.complete(value);
+
+        // match on protobuf request
+        when(commandManager.submitNewCommand(eq(FCall), eq(args), any())).thenReturn(testResponse);
+
+        // exercise
+        CompletableFuture<Object> response = service.fcall(function);
+        Object payload = response.get();
+
+        // verify
+        assertEquals(testResponse, response);
+        assertEquals(value, payload);
+    }
+
     @SneakyThrows
     @Test
     public void bitcount_returns_success() {