Bug: isdir API when not found should list it to check

tosfs/core.py

@@ -839,7 +839,16 @@ def isdir(self, path: str) -> bool:
             raise e
         except TosServerError as e:
             if e.status_code == TOS_SERVER_STATUS_CODE_NOT_FOUND:
-                return False
+                out = retryable_func_executor(
+                    lambda: self.tos_client.list_objects_type2(
+                        bucket,
+                        prefix=key,
+                        delimiter="/",
+                        max_keys=1,
+                    ),
+                    max_retry_num=self.max_retry_num,
+                )
+                return out.key_count > 0
             else:
                 raise e
         except Exception as e:

tosfs/tests/test_tosfs.py

@@ -55,6 +55,27 @@ def test_ls_dir(tosfs: TosFileSystem, bucket: str, temporary_workspace: str) ->
 
     assert tosfs.ls(f"{bucket}/{temporary_workspace}/nonexistent", detail=False) == []
 
+    path = f"{bucket}/{temporary_workspace}/a/b/c/d"
+    bucket, key, _ = tosfs._split_path(path)
+    tosfs.tos_client.put_object(bucket=bucket, key=key, content="")
+    assert tosfs.isdir(f"{bucket}/{temporary_workspace}/a")
+    assert not tosfs.isfile(f"{bucket}/{temporary_workspace}/a")
+    assert tosfs.info(f"{bucket}/{temporary_workspace}/a")["type"] == "directory"
+    assert tosfs.exists(f"{bucket}/{temporary_workspace}/a")
+    assert not tosfs.isdir(f"{bucket}/{temporary_workspace}/b")
+    assert not tosfs.isfile(f"{bucket}/{temporary_workspace}/b")
+    assert tosfs.isdir(f"{bucket}/{temporary_workspace}/a/b")
+    assert not tosfs.isfile(f"{bucket}/{temporary_workspace}/a/b")
+    assert tosfs.info(f"{bucket}/{temporary_workspace}/a/b")["type"] == "directory"
+    assert tosfs.exists(f"{bucket}/{temporary_workspace}/a/b")
+    assert tosfs.isdir(f"{bucket}/{temporary_workspace}/a/b/c")
+    assert not tosfs.isfile(f"{bucket}/{temporary_workspace}/a/b/c")
+    assert tosfs.info(f"{bucket}/{temporary_workspace}/a/b/c")["type"] == "directory"
+    assert tosfs.exists(f"{bucket}/{temporary_workspace}/a/b/c")
+    assert not tosfs.isdir(f"{bucket}/{temporary_workspace}/a/b/c/d")
+    assert tosfs.isfile(f"{bucket}/{temporary_workspace}/a/b/c/d")
+    assert tosfs.info(f"{bucket}/{temporary_workspace}/a/b/c/d")["type"] == "file"
+
 
 def test_ls_iterate(
     tosfs: TosFileSystem, bucket: str, temporary_workspace: str