simplify LIBVALKEY_AVAILABLE and drop LIBVALKEY_PACK_AVAILABLE

The former checked if the module version is >= 1.0, which is always true
for libvalkey Python module as the very first version will be 2.3.2.
Hence it can be simplified to the condition of `libvalkey` Python module
being available.

The latter is also obsolete, as the very first release of libvalkey-py
already contains `pack_command`. Hence, this boolean can be replaced
with `LIBVALKEY_AVAILABLE` where applicable.

Signed-off-by: Mikhail Koviazin <[email protected]>

tests/test_encoding.py

@@ -1,7 +1,7 @@
 import pytest
 import valkey
 from valkey.connection import Connection
-from valkey.utils import LIBVALKEY_PACK_AVAILABLE
+from valkey.utils import LIBVALKEY_AVAILABLE
 
 from .conftest import _get_client
 
@@ -76,7 +76,7 @@ def test_replace(self, request):
 
 
 @pytest.mark.skipif(
-    LIBVALKEY_PACK_AVAILABLE,
+    LIBVALKEY_AVAILABLE,
     reason="Packing via libvalkey does not preserve memoryviews",
 )
 class TestMemoryviewsAreNotPacked:

valkey/connection.py

@@ -36,7 +36,6 @@
 from .utils import (
     CRYPTOGRAPHY_AVAILABLE,
     LIBVALKEY_AVAILABLE,
-    LIBVALKEY_PACK_AVAILABLE,
     SSL_AVAILABLE,
     get_lib_version,
     str_if_bytes,
@@ -258,7 +257,7 @@ def __del__(self):
     def _construct_command_packer(self, packer):
         if packer is not None:
             return packer
-        elif LIBVALKEY_PACK_AVAILABLE:
+        elif LIBVALKEY_AVAILABLE:
             return LibvalkeyRespSerializer()
         else:
             return PythonRespSerializer(self._buffer_cutoff, self.encoder.encode)

valkey/utils.py

@@ -6,12 +6,9 @@
 try:
     import libvalkey  # noqa
 
-    # Only support libvalkey >= 1.0:
-    LIBVALKEY_AVAILABLE = not libvalkey.__version__.startswith("0.")
-    LIBVALKEY_PACK_AVAILABLE = hasattr(libvalkey, "pack_command")
+    LIBVALKEY_AVAILABLE = True
 except ImportError:
     LIBVALKEY_AVAILABLE = False
-    LIBVALKEY_PACK_AVAILABLE = False
 
 try:
     import ssl  # noqa