Add support for Redis 7 functions (#1998)

* add function support

* linters

* test fcall

* decode reponses for unstable_r

* linters

* fix evalsho_ro test

* fix eval_ro test

* add response callbaks

* linters

1 files changed, 94 insertions, 0 deletions

diff --git a/tests/test_function.py b/tests/test_function.py
new file mode 100644
index 0000000..921ba30
--- /dev/null
+++ b/tests/test_function.py
@@ -0,0 +1,94 @@
+import pytest
+
+from redis.exceptions import ResponseError
+
+function = "redis.register_function('myfunc', function(keys, args) return args[1] end)"
+function2 = "redis.register_function('hello', function() return 'Hello World' end)"
+set_function = "redis.register_function('set', function(keys, args) \
+                return redis.call('SET', keys[1], args[1]) end)"
+get_function = "redis.register_function('get', function(keys, args) \
+                return redis.call('GET', keys[1]) end)"
+
+
+@pytest.mark.onlynoncluster
+# @skip_if_server_version_lt("7.0.0") turn on after redis 7 release
+class TestFunction:
+    @pytest.fixture(autouse=True)
+    def reset_functions(self, unstable_r):
+        unstable_r.function_flush()
+
+    def test_function_load(self, unstable_r):
+        assert unstable_r.function_load("Lua", "mylib", function)
+        assert unstable_r.function_load("Lua", "mylib", function, replace=True)
+        with pytest.raises(ResponseError):
+            unstable_r.function_load("Lua", "mylib", function)
+        with pytest.raises(ResponseError):
+            unstable_r.function_load("Lua", "mylib2", function)
+
+    def test_function_delete(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", set_function)
+        with pytest.raises(ResponseError):
+            unstable_r.function_load("Lua", "mylib", set_function)
+        assert unstable_r.fcall("set", 1, "foo", "bar") == "OK"
+        assert unstable_r.function_delete("mylib")
+        with pytest.raises(ResponseError):
+            unstable_r.fcall("set", 1, "foo", "bar")
+        assert unstable_r.function_load("Lua", "mylib", set_function)
+
+    def test_function_flush(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", function)
+        assert unstable_r.fcall("myfunc", 0, "hello") == "hello"
+        assert unstable_r.function_flush()
+        with pytest.raises(ResponseError):
+            unstable_r.fcall("myfunc", 0, "hello")
+        with pytest.raises(ResponseError):
+            unstable_r.function_flush("ABC")
+
+    def test_function_list(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", function)
+        res = [
+            [
+                "library_name",
+                "mylib",
+                "engine",
+                "LUA",
+                "description",
+                None,
+                "functions",
+                [["name", "myfunc", "description", None]],
+            ],
+        ]
+        assert unstable_r.function_list() == res
+        assert unstable_r.function_list(library="*lib") == res
+        assert unstable_r.function_list(withcode=True)[0][9] == function
+
+    def test_fcall(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", set_function)
+        unstable_r.function_load("Lua", "mylib2", get_function)
+        assert unstable_r.fcall("set", 1, "foo", "bar") == "OK"
+        assert unstable_r.fcall("get", 1, "foo") == "bar"
+        with pytest.raises(ResponseError):
+            unstable_r.fcall("myfunc", 0, "hello")
+
+    def test_fcall_ro(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", function)
+        assert unstable_r.fcall_ro("myfunc", 0, "hello") == "hello"
+        unstable_r.function_load("Lua", "mylib2", set_function)
+        with pytest.raises(ResponseError):
+            unstable_r.fcall_ro("set", 1, "foo", "bar")
+
+    def test_function_dump_restore(self, unstable_r):
+        unstable_r.function_load("Lua", "mylib", set_function)
+        payload = unstable_r.function_dump()
+        assert unstable_r.fcall("set", 1, "foo", "bar") == "OK"
+        unstable_r.function_delete("mylib")
+        with pytest.raises(ResponseError):
+            unstable_r.fcall("set", 1, "foo", "bar")
+        assert unstable_r.function_restore(payload)
+        assert unstable_r.fcall("set", 1, "foo", "bar") == "OK"
+        unstable_r.function_load("Lua", "mylib2", get_function)
+        assert unstable_r.fcall("get", 1, "foo") == "bar"
+        unstable_r.function_delete("mylib")
+        assert unstable_r.function_restore(payload, "FLUSH")
+        with pytest.raises(ResponseError):
+            unstable_r.fcall("get", 1, "foo")