release tcp messages from memory (#92)

* Update _protocol.py

* Update CHANGELOG.md

* unpacker clears _file itself

* cleanup

* Update unpacker.py

---------

Co-authored-by: Blaise Thompson <blaise@untzag.com>

Author: ddkohler

yaqd-core/CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 ## [Unreleased]
 
 ### Fixed
+- daemon servers no longer keep all recieved messages in memory
 - removed asyncio syntax that was removed in python 3.14
 - type hints for IsSensor attributes are appropriate for _n_-dimensional data
 

yaqd-core/yaqd_core/avrorpc/unpacker.py

@@ -71,6 +71,11 @@ def feed(self, data: bytes):
         # Must support random access, if it does not, must be fed externally (e.g. TCP)
         pos = self._file.tell()
         self._file.seek(0, 2)
+        if pos == self._file.tell():
+            # read reached EOF and we are safe to clear
+            self._file.seek(0)
+            self._file.truncate(0)
+            pos = 0
         self._file.write(data)
         self._file.seek(pos)
         self.new_data.set()