[scripts/leveldb-dump] support setting separate key and value encodings

scripts/leveldb-dump

@@ -8,36 +8,42 @@ from sys import stdout
 import base64
 
 parser = argparse.ArgumentParser()
-parser.add_argument(
-    "--encode",
-    "-e",
-    choices=["utf8", "base16", "base32", "base64", "base85"],
-    default="utf8",
-)
+encoding_names = ["utf8", "base16", "base32", "base64", "base85"]
+parser.add_argument("--encoding", "-e", choices=encoding_names, default="utf8")
+parser.add_argument("--key-encoding", choices=encoding_names, default=None)
+parser.add_argument("--value-encoding", choices=encoding_names, default=None)
 parser.add_argument("db_path", type=Path)
 cli_args = parser.parse_args()
 
 
-def bytes_to_json(b: bytes) -> Union[str, list[int]]:
-    if cli_args.encode == "utf8":
+def bytes_to_json(b: bytes, encoding: str) -> Union[str, list[int]]:
+    if encoding == "utf8":
         try:
             return b.decode("utf8")
         except UnicodeDecodeError:
             return list(b)
-    elif cli_args.encode == "base16":
+    elif encoding == "base16":
         return base64.b16encode(b).decode("ascii")
-    elif cli_args.encode == "base32":
+    elif encoding == "base32":
         return base64.b32encode(b).decode("ascii")
-    elif cli_args.encode == "base64":
+    elif encoding == "base64":
         return base64.b64encode(b).decode("ascii")
-    elif cli_args.encode == "base85":
+    elif encoding == "base85":
         return base64.b85encode(b).decode("ascii")
     else:
         assert False
 
 
+key_encoding: str = cli_args.key_encoding or cli_args.encoding
+value_encoding: str = cli_args.value_encoding or cli_args.encoding
 db = plyvel.DB(str(cli_args.db_path), create_if_missing=False)
 with db.iterator() as iterator:
     for key, value in iterator:
-        json.dump({"key": bytes_to_json(key), "value": bytes_to_json(value)}, stdout)
+        json.dump(
+            {
+                "key": bytes_to_json(key, key_encoding),
+                "value": bytes_to_json(value, value_encoding),
+            },
+            stdout,
+        )
         stdout.write("\n")