Cull autofill entries older than 60 days.

chrome/browser/webdata/autocomplete_syncable_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/webdata/autocomplete_syncable_service.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 90 matching lines @@
 
   std::vector<AutofillEntry> new_synced_entries;
   // Go through and check for all the entries that sync already knows about.
   // CreateOrUpdateEntry() will remove entries that are same with the synced
   // ones from |new_db_entries|.
   for (SyncDataList::const_iterator sync_iter = initial_sync_data.begin();
        sync_iter != initial_sync_data.end(); ++sync_iter) {
     CreateOrUpdateEntry(*sync_iter, &new_db_entries, &new_synced_entries);
   }
 
+  // Check if newly received items need culling.
+  bool need_to_cull_data = false;
+  base::Time culling_time = base::Time::Now() -
+      base::TimeDelta::FromDays(AutofillEntry::kExpirationPeriodInDays);
+  for (size_t i = 0; i < new_synced_entries.size() && !need_to_cull_data; ++i) {
+    if (new_synced_entries[i].LastAccessOlder(culling_time))

[Ilya Sherman, 2012/03/15 21:00:41]

nit: Can we make this interface be "IsExpired()" and avoid exposing the constant
"AutofillEntry::kExpirationPeriodInDays"?

[GeorgeY, 2012/03/17 00:36:16]

sure, done

+      need_to_cull_data = true;
+  }
+
   if (!SaveChangesToWebData(new_synced_entries))
     return SyncError(FROM_HERE, "Failed to update webdata.", model_type());
 
   WebDataService::NotifyOfMultipleAutofillChanges(web_data_service_);
+  keys_to_ignore_.clear();
 
   SyncChangeList new_changes;
   for (AutocompleteEntryMap::iterator i = new_db_entries.begin();
        i != new_db_entries.end(); ++i) {
-    new_changes.push_back(
-        SyncChange(i->second.first, CreateSyncData(*(i->second.second))));
+    // Sync back only the data that appeared after |culling_time|.
+    if (!i->second.second->LastAccessOlder(culling_time)) {
+      new_changes.push_back(
+          SyncChange(i->second.first, CreateSyncData(*(i->second.second))));
+    } else {
+      need_to_cull_data = true;
+      // Key is not on the server and is too old, it will not ever be synced -
+      // delete it locally.
+      if (SyncChange::ACTION_ADD == i->second.first)
+        keys_to_ignore_.insert(i->first);
+    }
+  }
+
+  if (need_to_cull_data) {
+    // This will schedule deletion operation later on DB thread and we will
+    // be notified on the results of the deletion and deletes will be synced to
+    // the sync.
+    web_data_service_->RemoveFormElementsAccessedBefore(culling_time);
   }
 
   SyncError error = sync_processor_->ProcessSyncChanges(FROM_HERE, new_changes);
 
   return error;
 }
 
 void AutocompleteSyncableService::StopSyncing(syncable::ModelType type) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(syncable::AUTOFILL, type);
@@ skipping 219 matching lines @@
         }
         AutofillEntry entry(change->key(), timestamps);
         SyncChange::SyncChangeType change_type =
            (change->type() == AutofillChange::ADD) ?
                SyncChange::ACTION_ADD : SyncChange::ACTION_UPDATE;
         new_changes.push_back(SyncChange(change_type,
                                          CreateSyncData(entry)));
         break;
       }
       case AutofillChange::REMOVE: {
-        std::vector<base::Time> timestamps;
-        AutofillEntry entry(change->key(), timestamps);
-        new_changes.push_back(SyncChange(SyncChange::ACTION_DELETE,
-                                         CreateSyncData(entry)));
+        if (keys_to_ignore_.find(change->key()) == keys_to_ignore_.end()) {
+          std::vector<base::Time> timestamps;
+          AutofillEntry entry(change->key(), timestamps);
+          new_changes.push_back(SyncChange(SyncChange::ACTION_DELETE,
+                                           CreateSyncData(entry)));
+        }
         break;
       }
       default:
         NOTREACHED();
         break;
     }
   }
   SyncError error = sync_processor_->ProcessSyncChanges(FROM_HERE, new_changes);
   if (error.IsSet()) {
     DLOG(WARNING) << "[AUTOCOMPLETE SYNC]"
                   << " Failed processing change:"
                   << " Error:" << error.message();
   }
+  // |keys_to_ignore_| are only needed for the very first notification.
+  keys_to_ignore_.clear();
 }
 
 SyncData AutocompleteSyncableService::CreateSyncData(
     const AutofillEntry& entry) const {
   sync_pb::EntitySpecifics autofill_specifics;
   WriteAutofillEntry(entry, &autofill_specifics);
   std::string tag(KeyToTag(UTF16ToUTF8(entry.key().name()),
                            UTF16ToUTF8(entry.key().value())));
   return SyncData::CreateLocalData(tag, tag, autofill_specifics);
 }
 
 // static
 std::string AutocompleteSyncableService::KeyToTag(const std::string& name,
                                                   const std::string& value) {
   std::string ns(kAutofillEntryNamespaceTag);
   return ns + net::EscapePath(name) + "|" + net::EscapePath(value);
 }