Add support for AI.CONFIG (#7)

* Add support for AI.CONFIG

Author: dengliming

src/client.ts

@@ -150,4 +150,25 @@ export class Client {
         throw error;
       });
   }
+
+  /**
+   * Loads the DL/ML backend specified by the backend identifier from path.
+   *
+   * @param backend
+   * @param path
+   */
+  public configLoadBackend(backend: string, path: string): Promise<any> {
+    const args: any[] = ['LOADBACKEND', backend, path];
+    return this._sendCommand('ai.config', args);
+  }
+
+  /**
+   * Specifies the default base backends path to path.
+   *
+   * @param path
+   */
+  public configBackendsPath(path: string): Promise<any> {
+    const args: any[] = ['BACKENDSPATH', path];
+    return this._sendCommand('ai.config', args);
+  }
 }

tests/test_client.ts

@@ -622,3 +622,28 @@ it(
     aiclient.end(true);
   }),
 );
+
+it(
+    'ai.config positive and negative testing',
+    mochaAsync(async () => {
+        const nativeClient = createClient();
+        const aiclient = new Client(nativeClient);
+        const result = await aiclient.configBackendsPath('/usr/lib/redis/modules/backends/');
+        expect(result).to.equal('OK');
+        // negative test
+        try {
+            const loadReply = await aiclient.configLoadBackend(Backend.TF, 'notexist/redisai_tensorflow.so');
+        } catch (e) {
+            expect(e.toString()).to.equal('ReplyError: ERR error loading backend');
+        }
+
+        try {
+            // may throw error if backend already loaded
+            const loadResult = await aiclient.configLoadBackend(Backend.TF, 'redisai_tensorflow/redisai_tensorflow.so');
+            expect(loadResult).to.equal('OK');
+        } catch (e) {
+            expect(e.toString()).to.equal('ReplyError: ERR error loading backend');
+        }
+        aiclient.end(true);
+    }),
+);