feat(redis_client): add support for KEYS (#3159)

packages/redis_client/lib/src/redis_client.dart

@@ -170,6 +170,20 @@ class RedisClient {
     return execute(['AUTH', username, password]);
   }
 
+  /// Returns all keys matching the given pattern.
+  /// Equivalent to the `KEYS` command.
+  /// https://redis.io/commands/keys
+  Future<List<String>> keys({required String pattern}) async {
+    final rawResult = await execute(['KEYS', pattern]) as List<RespType>;
+    return rawResult
+        .whereType<RespBulkString>()
+        .map(
+          (result) => result.payload,
+        )
+        .whereType<String>()
+        .toList();
+  }
+
   /// Set the value of a key.
   /// Equivalent to the `SET` command.
   /// https://redis.io/commands/set

packages/redis_client/test/src/redis_client_test.dart

@@ -118,6 +118,44 @@ void main() {
       });
     });
 
+    group('KEYS', () {
+      setUp(() async {
+        await client.connect();
+      });
+
+      tearDown(() async {
+        try {
+          await client.execute(['FLUSHALL', 'SYNC']);
+        } on Exception {
+          // ignore
+        }
+      });
+
+      group('when no keys match the pattern', () {
+        test('returns an empty list', () async {
+          final keys = await client.keys(pattern: 'foo');
+          expect(keys, isEmpty);
+        });
+      });
+
+      group('when keys match the pattern', () {
+        setUp(() async {
+          await client.set(key: 'foo', value: 'bar');
+          await client.set(
+            key: 'foofoo', // cspell:disable-line
+            value: 'barbar', // cspell:disable-line
+          );
+          await client.set(key: 'bar', value: 'baz');
+        });
+
+        test('returns the keys', () async {
+          final keys = await client.keys(pattern: 'foo*');
+          expect(keys.length, equals(2));
+          expect(keys, containsAll(['foo', 'foofoo'])); // cspell:disable-line
+        });
+      });
+    });
+
     group('AUTH', () {
       setUp(() async {
         await client.connect();
@@ -177,7 +215,7 @@ void main() {
 
       tearDown(() async {
         try {
-          await client.execute(['FLUSHALL SYNC']);
+          await client.execute(['FLUSHALL', 'SYNC']);
         } on Exception {
           // ignore
         }
@@ -227,7 +265,7 @@ void main() {
 
       tearDown(() async {
         try {
-          await client.execute(['FLUSHALL SYNC']);
+          await client.execute(['FLUSHALL', 'SYNC']);
         } on Exception {
           // ignore
         }
@@ -261,10 +299,7 @@ void main() {
 
       tearDown(() async {
         try {
-          for (final pair in kvPairs) {
-            await expectLater(client.delete(key: pair.key), completes);
-          }
-          await client.execute(['FLUSHALL SYNC']);
+          await client.execute(['FLUSHALL', 'SYNC']);
         } on Exception {
           // ignore
         }
@@ -291,7 +326,7 @@ void main() {
 
         tearDown(() async {
           try {
-            await client.execute(['FLUSHALL SYNC']);
+            await client.execute(['FLUSHALL', 'SYNC']);
           } on Exception {
             // ignore
           }
@@ -408,7 +443,7 @@ void main() {
 
         tearDown(() async {
           try {
-            await client.execute(['FLUSHALL SYNC']);
+            await client.execute(['FLUSHALL', 'SYNC']);
           } on Exception {
             // ignore
           }
@@ -672,7 +707,7 @@ void main() {
 
       tearDown(() async {
         try {
-          await client.execute(['FLUSHALL SYNC']);
+          await client.execute(['FLUSHALL', 'SYNC']);
         } on Exception {
           // ignore
         }