remove superflous check in tests

chatmaild/src/chatmaild/chatmail-metadata.service.f

@@ -2,7 +2,7 @@
 Description=Chatmail dict proxy for IMAP METADATA
 
 [Service]
-ExecStart={execpath} /run/dovecot/metadata.socket vmail {config_path}
+ExecStart={execpath} /run/dovecot/metadata.socket vmail {config_path} /home/vmail/metadata
 Restart=always
 RestartSec=30
 

chatmaild/src/chatmaild/metadata.py

@@ -1,5 +1,6 @@
 import pwd
 
+import pathlib
 from queue import Queue
 from threading import Thread
 from socketserver import (
@@ -12,6 +13,7 @@ import sys
 import logging
 import os
 import requests
+import marshal
 
 
 DICTPROXY_LOOKUP_CHAR = "L"
@@ -23,12 +25,37 @@ DICTPROXY_TRANSACTION_CHARS = "SBC"
 
 
 class Notifier:
-    def __init__(self):
-        self.guid2token = {}
+    def __init__(self, metadata_dir):
+        self.metadata_dir = metadata_dir
         self.to_notify_queue = Queue()
 
+    def get_metadata(self, guid):
+        guid_path = self.metadata_dir.joinpath(guid)
+        if guid_path.exists():
+            with guid_path.open("rb") as f:
+                return marshal.load(f)
+        return {}
+
+    def set_metadata(self, guid, guid_data):
+        guid_path = self.metadata_dir.joinpath(guid)
+        write_path = guid_path.with_suffix(".tmp")
+        with write_path.open("wb") as f:
+            marshal.dump(guid_data, f)
+        os.rename(write_path, guid_path)
+
     def set_token(self, guid, token):
-        self.guid2token[guid] = token
+        guid_data = self.get_metadata(guid)
+        guid_data["token"] = token
+        self.set_metadata(guid, guid_data)
+
+    def del_token(self, guid):
+        guid_data = self.get_metadata(guid)
+        if "token" in guid_data:
+            del guid_data["token"]
+            self.set_metadata(guid, guid_data)
+
+    def get_token(self, guid):
+        return self.get_metadata(guid).get("token")
 
     def new_message_for_guid(self, guid):
         self.to_notify_queue.put(guid)
@@ -40,7 +67,7 @@ class Notifier:
 
     def thread_run_one(self, requests_session):
         guid = self.to_notify_queue.get()
-        token = self.guid2token.get(guid)
+        token = self.get_token(guid)
         if token:
             response = requests_session.post(
                 "https://notifications.delta.chat/notify",
@@ -50,7 +77,7 @@ class Notifier:
             if response.status_code == 410:
                 # 410 Gone status code
                 # means the token is no longer valid.
-                del self.guid2token[guid]
+                self.del_token(guid)
 
 
 def handle_dovecot_protocol(rfile, wfile, notifier):
@@ -119,12 +146,15 @@ class ThreadedUnixStreamServer(ThreadingMixIn, UnixStreamServer):
 
 
 def main():
-    socket, username, config = sys.argv[1:]
+    socket, username, config, metadata_dir = sys.argv[1:]
     passwd_entry = pwd.getpwnam(username)
 
     # XXX config is not currently used
     config = read_config(config)
-    notifier = Notifier()
+    metadata_dir = pathlib.Path(metadata_dir)
+    if not metadata_dir.exists():
+        metadata_dir.mkdir()
+    notifier = Notifier(metadata_dir)
 
     class Handler(StreamRequestHandler):
         def handle(self):

chatmaild/src/chatmaild/tests/test_metadata.py

@@ -1,4 +1,5 @@
 import io
+import pytest
 
 from chatmaild.metadata import (
     handle_dovecot_request,
@@ -7,40 +8,60 @@ from chatmaild.metadata import (
 )
 
 
-def test_handle_dovecot_request_lookup_fails():
-    notifier = Notifier()
+@pytest.fixture
+def notifier(tmp_path):
+    metadata_dir = tmp_path.joinpath("metadata")
+    metadata_dir.mkdir()
+    return Notifier(metadata_dir)
+
+
+def test_notifier_persistence(tmp_path):
+    metadata_dir = tmp_path.joinpath("metadata")
+    metadata_dir.mkdir()
+    notifier1 = Notifier(metadata_dir)
+    notifier2 = Notifier(metadata_dir)
+    assert notifier1.get_token(guid="guid00") is None
+    assert notifier2.get_token(guid="guid00") is None
+
+    notifier1.set_token("guid00", "01234")
+    notifier1.set_token("guid03", "456")
+    assert notifier2.get_token("guid00") == "01234"
+    assert notifier2.get_token("guid03") == "456"
+    notifier2.del_token("guid00")
+    assert notifier1.get_token("guid00") is None
+
+
+def test_handle_dovecot_request_lookup_fails(notifier):
     res = handle_dovecot_request("Lpriv/123/chatmail", {}, notifier)
     assert res == "N\n"
 
 
-def test_handle_dovecot_request_happy_path():
-    notifier = Notifier()
+def test_handle_dovecot_request_happy_path(notifier):
     transactions = {}
 
     # lookups return the same NOTFOUND result
     res = handle_dovecot_request("Lpriv/123/chatmail", transactions, notifier)
     assert res == "N\n"
-    assert not notifier.guid2token and not transactions
+    assert notifier.get_token("guid00") is None and not transactions
 
     # set device token in a transaction
     tx = "1111"
     msg = f"B{tx}\tuser"
     res = handle_dovecot_request(msg, transactions, notifier)
-    assert not res and not notifier.guid2token
+    assert not res and notifier.get_token("guid00") is None
     assert transactions == {tx: "O\n"}
 
     msg = f"S{tx}\tpriv/guid00/devicetoken\t01234"
     res = handle_dovecot_request(msg, transactions, notifier)
     assert not res
     assert len(transactions) == 1
-    assert len(notifier.guid2token) == 1
-    assert notifier.guid2token["guid00"] == "01234"
+    assert notifier.get_token("guid00") == "01234"
 
     msg = f"C{tx}"
     res = handle_dovecot_request(msg, transactions, notifier)
     assert res == "O\n"
     assert len(transactions) == 0
-    assert notifier.guid2token["guid00"] == "01234"
+    assert notifier.get_token("guid00") == "01234"
 
     # trigger notification for incoming message
     assert handle_dovecot_request(f"B{tx}\tuser", transactions, notifier) is None
@@ -52,7 +73,7 @@ def test_handle_dovecot_request_happy_path():
     assert not transactions
 
 
-def test_handle_dovecot_protocol_set_devicetoken():
+def test_handle_dovecot_protocol_set_devicetoken(notifier):
     rfile = io.BytesIO(
         b"\n".join(
             [
@@ -64,13 +85,12 @@ def test_handle_dovecot_protocol_set_devicetoken():
         )
     )
     wfile = io.BytesIO()
-    notifier = Notifier()
     handle_dovecot_protocol(rfile, wfile, notifier)
-    assert notifier.guid2token["guid00"] == "01234"
+    assert notifier.get_token("guid00") == "01234"
     assert wfile.getvalue() == b"O\n"
 
 
-def test_handle_dovecot_protocol_iterate():
+def test_handle_dovecot_protocol_iterate(notifier):
     rfile = io.BytesIO(
         b"\n".join(
             [
@@ -80,12 +100,11 @@ def test_handle_dovecot_protocol_iterate():
         )
     )
     wfile = io.BytesIO()
-    notifier = Notifier()
     handle_dovecot_protocol(rfile, wfile, notifier)
     assert wfile.getvalue() == b"\n"
 
 
-def test_handle_dovecot_protocol_messagenew():
+def test_handle_dovecot_protocol_messagenew(notifier):
     rfile = io.BytesIO(
         b"\n".join(
             [
@@ -97,14 +116,13 @@ def test_handle_dovecot_protocol_messagenew():
         )
     )
     wfile = io.BytesIO()
-    notifier = Notifier()
     handle_dovecot_protocol(rfile, wfile, notifier)
     assert wfile.getvalue() == b"O\n"
     assert notifier.to_notify_queue.get() == "guid00"
     assert notifier.to_notify_queue.qsize() == 0
 
 
-def test_notifier_thread_run():
+def test_notifier_thread_run(notifier):
     requests = []
 
     class ReqMock:
@@ -116,16 +134,15 @@ def test_notifier_thread_run():
 
             return Result()
 
-    notifier = Notifier()
     notifier.set_token("guid00", "01234")
     notifier.new_message_for_guid("guid00")
     notifier.thread_run_one(ReqMock())
     url, data, timeout = requests[0]
     assert data == "01234"
-    assert len(notifier.guid2token) == 1
+    assert notifier.get_token("guid00") == "01234"
 
 
-def test_notifier_thread_run_gone_removes_token():
+def test_notifier_thread_run_gone_removes_token(notifier):
     requests = []
 
     class ReqMock:
@@ -137,11 +154,10 @@ def test_notifier_thread_run_gone_removes_token():
 
             return Result()
 
-    notifier = Notifier()
     notifier.set_token("guid00", "01234")
     notifier.new_message_for_guid("guid00")
-    assert notifier.guid2token["guid00"] == "01234"
+    assert notifier.get_token("guid00") == "01234"
     notifier.thread_run_one(ReqMock())
     url, data, timeout = requests[0]
     assert data == "01234"
-    assert len(notifier.guid2token) == 0
+    assert notifier.get_token("guid00") is None