This is a bit more likely to work

lib/nntp/tiny/session.py

@@ -4,6 +4,7 @@ import re
 
 from typing import Optional
 
+from nntp.tiny.db        import Database
 from nntp.tiny.server    import Server, ServerCapability
 from nntp.tiny.response  import Response, ResponseCode
 from nntp.tiny.newsgroup import Newsgroup
@@ -42,16 +43,16 @@ class MessageRange():
 
         return "?"
 
-    def __dict__(self):
+    def where(self):
         if self.id is not None:
-            return {'id': self.id}
+            return "id = %d" % (self.id)
 
         if self.min is not None and self.max is None:
-            return { 'min(id)': self.min }
+            return "id >= %d" % (self.min)
         elif self.min is not None and self.max is not None:
-            return { 'min(id)': self.min, 'max(id)': self.max }
+            return "id >= %d and id <= %d" % (self.min, self.max)
         elif self.min is None and self.max is not None:
-            return { 'max(id)': self.max }
+            return "id <= %d" % (self.max)
 
     @staticmethod
     def parse(r: str):
@@ -100,6 +101,7 @@ class Session():
     
     def __init__(self, server: Server, sock: socket.socket):
         self.server: Server      = server
+        self.db: Database        = server.db
         self.state: SessionState = SessionState.NONE
         self.sock: socket.socket = sock
         self.buf: LineBuffer     = LineBuffer()
@@ -151,7 +153,7 @@ class Session():
                 newsgroup_id = ?
         """
 
-        cr  = self.server.db.execute(sql, (newsgroup.id))
+        cr  = self.db.execute(sql, (newsgroup.id))
         row = cr.fetchone()
 
         text = "%d %d %d %s" % (
@@ -167,6 +169,27 @@ class Session():
 
         return
 
+    def _newsgroup_summary(self, newsgroup: Newsgroup) -> str:
+        sql = """
+            select
+                count(id),
+                min(id),
+                max(id)
+            from
+                newsgroup_message
+            where
+                newsgroup_id = ?
+        """
+
+        cr  = self.db.execute(sql, (newsgroup.id))
+        row = cr.fetchone()
+
+        return "%d %d %d %s" % (
+            row[0],
+            row[1],
+            row[2],
+            newsgroup.name
+        )
 
     def _cmd_listgroup(self, *args):
         newsgroup = self.newsgroup
@@ -179,16 +202,24 @@ class Session():
             if newsgroup is None:
                 return self.respond(ResponseCode.NNTP_NEWSGROUP_NOT_FOUND)
 
-        values = {
-            'newsgroup_id': newsgroup.id
-        }
+        sql = """
+            select
+                id
+            from
+                newsgroup_message
+            where
+                newsgroup_id = ?
+        """
 
         if len(args) > 1:
-            msgrange = MessageRange.parse(args[1])z
+            msgrange = MessageRange.parse(args[1])
 
-            values.update(dict(msgrange))
+            sql += " and " msgrange.clause()
 
-        cr = self.server.db.query(Message, values)
+        text = self._newsgroup_summary(newsgroup)
+        cr   = self.db.execute(sql, (newsgroup.id))
+
+        self.respond(ResponseCode.NNTP_GROUP_LISTING, text)
 
         for message in cr.each():
             self.print(str(message.id))