Node: added PFCOUNT command

CHANGELOG.md

@@ -18,6 +18,7 @@
 * Node: Added OBJECT ENCODING command ([#1518](https://github.com/aws/glide-for-redis/pull/1518))
 * Python: Added LMOVE and BLMOVE commands ([#1536](https://github.com/aws/glide-for-redis/pull/1536))
 * Node: Added SUNIONSTORE command ([#1549](https://github.com/aws/glide-for-redis/pull/1549))
+* Node: Added PFCOUNT command ([#1545](https://github.com/aws/glide-for-redis/pull/1545))
 
 ### Breaking Changes
 * Node: Update XREAD to return a Map of Map ([#1494](https://github.com/aws/glide-for-redis/pull/1494))

node/src/BaseClient.ts

@@ -61,6 +61,7 @@ import {
     createPTTL,
     createPersist,
     createPfAdd,
+    createPfCount,
     createRPop,
     createRPush,
     createRename,
@@ -2443,6 +2444,25 @@ export class BaseClient {
         return this.createWritePromise(createPfAdd(key, elements));
     }
 
+    /** Estimates the cardinality of the data stored in a HyperLogLog structure for a single key or
+     * calculates the combined cardinality of multiple keys by merging their HyperLogLogs temporarily.
+     *
+     * See https://valkey.io/commands/pfcount/ for more details.
+     *
+     * @remarks When in cluster mode, all `keys` must map to the same hash slot.
+     * @param keys - The keys of the HyperLogLog data structures to be analyzed.
+     * @returns - The approximated cardinality of given HyperLogLog data structures.
+     *     The cardinality of a key that does not exist is `0`.
+     * @example
+     * ```typescript
+     * const result = await client.pfcount(["hll_1", "hll_2"]);
+     * console.log(result); // Output: 4 - The approximated cardinality of the union of "hll_1" and "hll_2"
+     * ```
+     */
+    public pfcount(keys: string[]): Promise<number> {
+        return this.createWritePromise(createPfCount(keys));
+    }
+
     /** Returns the internal encoding for the Redis object stored at `key`.
      *
      * See https://valkey.io/commands/object-encoding for more details.

node/src/Commands.ts

@@ -1423,6 +1423,13 @@ export function createPfAdd(
     return createCommand(RequestType.PfAdd, args);
 }
 
+/**
+ * @internal
+ */
+export function createPfCount(keys: string[]): redis_request.Command {
+    return createCommand(RequestType.PfCount, keys);
+}
+
 /**
  * @internal
  */

node/src/Transaction.ts

@@ -63,6 +63,7 @@ import {
     createPTTL,
     createPersist,
     createPfAdd,
+    createPfCount,
     createPing,
     createRPop,
     createRPush,
@@ -1397,6 +1398,19 @@ export class BaseTransaction<T extends BaseTransaction<T>> {
         return this.addAndReturn(createPfAdd(key, elements));
     }
 
+    /** Estimates the cardinality of the data stored in a HyperLogLog structure for a single key or
+     * calculates the combined cardinality of multiple keys by merging their HyperLogLogs temporarily.
+     *
+     * See https://valkey.io/commands/pfcount/ for more details.
+     *
+     * @param keys - The keys of the HyperLogLog data structures to be analyzed.
+     * Command Response - The approximated cardinality of given HyperLogLog data structures.
+     *     The cardinality of a key that does not exist is `0`.
+     */
+    public pfcount(keys: string[]): T {
+        return this.addAndReturn(createPfCount(keys));
+    }
+
     /** Returns the internal encoding for the Redis object stored at `key`.
      *
      * See https://valkey.io/commands/object-encoding for more details.

node/tests/RedisClusterClient.test.ts

@@ -290,6 +290,7 @@ describe("RedisClusterClient", () => {
                 client.sinter(["abc", "zxy", "lkn"]),
                 client.zinterstore("abc", ["zxy", "lkn"]),
                 client.sunionstore("abc", ["zxy", "lkn"]),
+                client.pfcount(["abc", "zxy", "lkn"]),
                 // TODO all rest multi-key commands except ones tested below
             ];
 

node/tests/SharedTests.ts

@@ -2669,6 +2669,46 @@ export function runBaseTests<Context>(config: {
         config.timeout,
     );
 
+    it.each([ProtocolVersion.RESP2, ProtocolVersion.RESP3])(
+        "pfcount test_%p",
+        async (protocol) => {
+            await runTest(async (client: BaseClient) => {
+                const key1 = `{key}-1-${uuidv4()}`;
+                const key2 = `{key}-2-${uuidv4()}`;
+                const key3 = `{key}-3-${uuidv4()}`;
+                const stringKey = `{key}-4-${uuidv4()}`;
+                const nonExistingKey = `{key}-5-${uuidv4()}`;
+
+                expect(await client.pfadd(key1, ["a", "b", "c"])).toEqual(1);
+                expect(await client.pfadd(key2, ["b", "c", "d"])).toEqual(1);
+                expect(await client.pfcount([key1])).toEqual(3);
+                expect(await client.pfcount([key2])).toEqual(3);
+                expect(await client.pfcount([key1, key2])).toEqual(4);
+                expect(
+                    await client.pfcount([key1, key2, nonExistingKey]),
+                ).toEqual(4);
+
+                // empty HyperLogLog data set
+                expect(await client.pfadd(key3, [])).toEqual(1);
+                expect(await client.pfcount([key3])).toEqual(0);
+
+                // invalid argument - key list must not be empty
+                try {
+                    expect(await client.pfcount([])).toThrow();
+                } catch (e) {
+                    expect((e as Error).message).toMatch(
+                        "ResponseError: wrong number of arguments",
+                    );
+                }
+
+                // key exists, but it is not a HyperLogLog
+                expect(await client.set(stringKey, "value")).toEqual("OK");
+                await expect(client.pfcount([stringKey])).rejects.toThrow();
+            }, protocol);
+        },
+        config.timeout,
+    );
+
     // Set command tests
 
     async function setWithExpiryOptions(client: BaseClient) {

node/tests/TestUtilities.ts

@@ -408,5 +408,7 @@ export async function transactionTest(
     args.push([key6, field + "1"]);
     baseTransaction.pfadd(key11, ["a", "b", "c"]);
     args.push(1);
+    baseTransaction.pfcount([key11]);
+    args.push(3);
     return args;
 }