Snapshot count from history was not updated in watch after using [clear history] (#2459)

changedetectionio/model/Watch.py

@@ -238,6 +238,8 @@ class model(dict):
 
         if len(tmp_history):
             self.__newest_history_key = list(tmp_history.keys())[-1]
+        else:
+            self.__newest_history_key = None
 
         self.__history_n = len(tmp_history)
 

changedetectionio/store.py

@@ -242,6 +242,14 @@ class ChangeDetectionStore:
     def clear_watch_history(self, uuid):
         import pathlib
 
+        # JSON Data, Screenshots, Textfiles (history index and snapshots), HTML in the future etc
+        for item in pathlib.Path(os.path.join(self.datastore_path, uuid)).rglob("*.*"):
+            unlink(item)
+
+        # Force the attr to recalculate
+        bump = self.__data['watching'][uuid].history
+
+        # Do this last because it will trigger a recheck due to last_checked being zero
         self.__data['watching'][uuid].update({
                 'browser_steps_last_error_step' : None,
                 'check_count': 0,
@@ -258,13 +266,6 @@ class ChangeDetectionStore:
                 'track_ldjson_price_data': None,
             })
 
-        # JSON Data, Screenshots, Textfiles (history index and snapshots), HTML in the future etc
-        for item in pathlib.Path(os.path.join(self.datastore_path, uuid)).rglob("*.*"):
-            unlink(item)
-
-        # Force the attr to recalculate
-        bump = self.__data['watching'][uuid].history
-
         self.needs_write_urgent = True
 
     def add_watch(self, url, tag='', extras=None, tag_uuids=None, write_to_disk_now=True):

changedetectionio/tests/test_backend.py

@@ -3,7 +3,8 @@
 import time
 from flask import url_for
 from urllib.request import urlopen
-from .util import set_original_response, set_modified_response, live_server_setup, wait_for_all_checks, extract_rss_token_from_UI
+from .util import set_original_response, set_modified_response, live_server_setup, wait_for_all_checks, extract_rss_token_from_UI, \
+    extract_UUID_from_client
 
 sleep_time_for_fetch_thread = 3
 
@@ -141,6 +142,14 @@ def test_check_basic_change_detection_functionality(client, live_server):
     assert b'Mark all viewed' not in res.data
     assert b'unviewed' not in res.data
 
+    # #2458 "clear history" should make the Watch object update its status correctly when the first snapshot lands again
+    uuid = extract_UUID_from_client(client)
+    client.get(url_for("clear_watch_history", uuid=uuid))
+    client.get(url_for("form_watch_checknow"), follow_redirects=True)
+    wait_for_all_checks(client)
+    res = client.get(url_for("index"))
+    assert b'preview/' in res.data
+
     #
     # Cleanup everything
     res = client.get(url_for("form_delete", uuid="all"), follow_redirects=True)

changedetectionio/update_worker.py

@@ -250,8 +250,7 @@ class update_worker(threading.Thread):
                     # Clear last errors (move to preflight func?)
                     self.datastore.data['watching'][uuid]['browser_steps_last_error_step'] = None
 
-                    # DeepCopy so we can be sure we don't accidently change anything by reference
-                    watch = deepcopy(self.datastore.data['watching'].get(uuid))
+                    watch = self.datastore.data['watching'].get(uuid)
 
                     logger.info(f"Processing watch UUID {uuid} Priority {queued_item_data.priority} URL {watch['url']}")
                     now = time.time()