Change Cache to use a TemporaryDirectory for its storage to

ensure and simplify thorough cleanups upon shutdown.

Thanks to Ghost for making me aware of this possibility!

av98.py

@@ -1422,7 +1422,6 @@ current gemini browsing session."""
         # Close TOFU DB
         self.tofu_store.close()
         # Clean up after ourself
-        self.cache.empty()
         os.unlink(self.raw_file_buffer)
         os.unlink(self.rendered_file_buffer)
 

cache.py

@@ -16,6 +16,7 @@ class Cache:
 
         self.cache = {}
         self.cache_timestamps = {}
+        self.tempdir = tempfile.TemporaryDirectory()
 
     def check(self, url):
         if url not in self.cache:
@@ -37,7 +38,7 @@ class Cache:
 
     def add(self, url, mime, filename):
         # Copy client's buffer file to new cache file
-        tmpf = tempfile.NamedTemporaryFile(delete=False)
+        tmpf = tempfile.NamedTemporaryFile(dir=self.tempdir.name, delete=False)
         tmpf.close()
         shutil.copyfile(filename, tmpf.name)
         # Remember details
@@ -68,11 +69,6 @@ class Cache:
     def get(self, url):
         return self.cache[url]
 
-    def empty(self):
-        for mime, filename in self.cache.values():
-            if os.path.exists(filename):
-                os.unlink(filename)
-
     def validatecache(self):
         assert self.cache.keys() == self.cache_timestamps.keys()
         for _, filename in self.cache.values():