Add support for LATENCY LATEST (#2514)

* Add support for LATENCY LATEST.

* Fix the review comments.

* Fix the review comments.

* Update LATENCY_LATEST.ts

* Update dockers.ts

* Update LATENCY_GRAPH.spec.ts

* enable debug mode in tests

---------

Co-authored-by: Leibale Eidelman <me@leibale.com>

packages/client/lib/commands/LATENCY_GRAPH.spec.ts

@@ -24,9 +24,5 @@ describe('LATENCY GRAPH', () => {
             typeof await client.latencyGraph('command'),
             'string'
         );
-    }, {
-        serverArguments: testUtils.isVersionGreaterThan([7]) ?
-            ['--enable-debug-command', 'yes'] :
-            GLOBAL.SERVERS.OPEN.serverArguments
-    });
+    }, GLOBAL.SERVERS.OPEN);
 });

packages/client/lib/commands/LATENCY_LATEST.spec.ts

@@ -0,0 +1,27 @@
+import {strict as assert} from 'assert';
+import testUtils, {GLOBAL} from '../test-utils';
+import { transformArguments } from './LATENCY_LATEST';
+
+describe('LATENCY LATEST', () => {
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments(),
+            ['LATENCY', 'LATEST']
+        );
+    });
+
+    testUtils.testWithClient('client.latencyLatest', async client => {
+        await Promise.all([
+            client.configSet('latency-monitor-threshold', '100'),
+            client.sendCommand(['DEBUG', 'SLEEP', '1'])
+        ]);
+        const latency = await client.latencyLatest();
+        assert.ok(Array.isArray(latency));
+        for (const [name, timestamp, latestLatency, allTimeLatency] of latency) {
+            assert.equal(typeof name, 'string');
+            assert.equal(typeof timestamp, 'number');
+            assert.equal(typeof latestLatency, 'number');
+            assert.equal(typeof allTimeLatency, 'number');
+        }
+    }, GLOBAL.SERVERS.OPEN);
+});

packages/client/lib/commands/LATENCY_LATEST.ts

@@ -0,0 +1,12 @@
+import { RedisCommandArguments } from '.';
+
+export function transformArguments(): RedisCommandArguments {
+    return ['LATENCY', 'LATEST'];
+}
+
+export declare function transformReply(): Array<[
+    name: string,
+    timestamp: number,
+    latestLatency: number,
+    allTimeLatency: number
+]>;