Fix issue with buffers in objects using hSet (#2139)

* Fix issue with buffers in objects using hSet

When using hSet with an object, any buffer values inside the object are converted to strings instead of left as buffers.
This fix specifically handles the special case of buffers, whilst casting everything else strings (to continue "gracefully" handling the case where the value not a valid type).

* Update HSET.ts

* Update HSET.spec.ts

Co-authored-by: Leibale Eidelman <leibale1998@gmail.com>

Author: Tyris

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

@@ -41,11 +41,20 @@ describe('HSET', () => {
             );
         });
 
-        it('Object', () => {
-            assert.deepEqual(
-                transformArguments('key', { field: 'value' }),
-                ['HSET', 'key', 'field', 'value']
-            );
+        describe('Object', () => {
+            it('string', () => {
+                assert.deepEqual(
+                    transformArguments('key', { field: 'value' }),
+                    ['HSET', 'key', 'field', 'value']
+                );
+            });
+            
+            it('Buffer', () => {
+                assert.deepEqual(
+                    transformArguments('key', { field: Buffer.from('value') }),
+                    ['HSET', 'key', 'field', Buffer.from('value')]
+                );
+            });
         });
     });
 
@@ -62,4 +71,4 @@ describe('HSET', () => {
             1
         );
     }, GLOBAL.CLUSTERS.OPEN);
-});
+});

packages/client/lib/commands/HSET.ts

@@ -20,8 +20,10 @@ export function transformArguments(...[ key, value, fieldValue ]: SingleFieldArg
     const args: RedisCommandArguments = ['HSET', key];
 
     if (typeof value === 'string' || typeof value === 'number' || Buffer.isBuffer(value)) {
-        pushValue(args, value);
-        pushValue(args, fieldValue!);
+        args.push(
+            convertValue(value),
+            convertValue(fieldValue!)
+        );
     } else if (value instanceof Map) {
         pushMap(args, value);
     } else if (Array.isArray(value)) {
@@ -35,8 +37,10 @@ export function transformArguments(...[ key, value, fieldValue ]: SingleFieldArg
 
 function pushMap(args: RedisCommandArguments, map: HSETMap): void {
     for (const [key, value] of map.entries()) {
-        pushValue(args, key);
-        pushValue(args, value);
+        args.push(
+            convertValue(key),
+            convertValue(value)
+        );
     }
 }
 
@@ -47,22 +51,23 @@ function pushTuples(args: RedisCommandArguments, tuples: HSETTuples): void {
             continue;
         }
 
-        pushValue(args, tuple);
+        args.push(convertValue(tuple));
     }
 }
 
 function pushObject(args: RedisCommandArguments, object: HSETObject): void {
     for (const key of Object.keys(object)) {
-        args.push(key.toString(), object[key].toString());
+        args.push(
+            convertValue(key),
+            convertValue(object[key])
+        );
     }
 }
 
-function pushValue(args: RedisCommandArguments, value: Types): void {
-    args.push(
-        typeof value === 'number' ?
-            value.toString() :
-            value
-    );
+function convertValue(value: Types): RedisCommandArgument {
+    return typeof value === 'number' ?
+        value.toString() :
+        value;
 }
 
 export declare function transformReply(): number;