add serialize for arrow FileInfo

Author: fjetter

distributed/protocol/arrow.py

@@ -47,3 +47,24 @@ def deserialize_table(header, frames):
     blob = frames[0]
     reader = pyarrow.RecordBatchStreamReader(pyarrow.BufferReader(blob))
     return reader.read_all()
+
+
+@dask_serialize.register(pyarrow.fs.FileInfo)
+def _serialize_fileinfo(fileinfo):
+    return {}, [
+        (
+            fileinfo.path,
+            fileinfo.size,
+            fileinfo.mtime_ns,
+        )
+    ]
+
+
+@dask_deserialize.register(pyarrow.fs.FileInfo)
+def _deserialize_fileinfo(header, frames):
+    path, size, mtime_ns = frames[0]
+    return pyarrow.fs.FileInfo(
+        path=path,
+        size=size,
+        mtime_ns=mtime_ns,
+    )