caches: use .refresh() instead of .invalidate()

- .invalidate() does a delete of cached valued under a key, which means
in previous logic we delete, get_or_create, and compute.
- .refresh() is simply replacing exising key with newly computed values, this
creates less locks, and it's faster.

rhodecode/apps/repository/views/repo_feed.py

@@ -161,14 +161,12 b' class RepoFeedView(RepoAppView):'
         inv_context_manager = rc_cache.InvalidationContext(
             uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
         with inv_context_manager as invalidation_context:
-            # check for stored invalidation signal, and maybe purge the cache
-            # before computing it again
+            args = (self.db_repo.repo_id, self.db_repo.repo_name, 'atom',)
+            # re-compute and store cache if we get invalidate signal
             if invalidation_context.should_invalidate():
-                generate_atom_feed.invalidate(
-                    self.db_repo.repo_id, self.db_repo.repo_name, 'atom')
-
-            mime_type, feed = generate_atom_feed(
-                self.db_repo.repo_id, self.db_repo.repo_name, 'atom')
+                mime_type, feed = generate_atom_feed.refresh(*args)
+            else:
+                mime_type, feed = generate_atom_feed(*args)
 
             log.debug('Repo ATOM feed computed in %.3fs',
                       inv_context_manager.compute_time)
@@ -226,14 +224,12 b' class RepoFeedView(RepoAppView):'
         inv_context_manager = rc_cache.InvalidationContext(
             uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
         with inv_context_manager as invalidation_context:
-            # check for stored invalidation signal, and maybe purge the cache
-            # before computing it again
+            args = (self.db_repo.repo_id, self.db_repo.repo_name, 'rss',)
+            # re-compute and store cache if we get invalidate signal
             if invalidation_context.should_invalidate():
-                generate_rss_feed.invalidate(
-                    self.db_repo.repo_id, self.db_repo.repo_name, 'rss')
-
-            mime_type, feed = generate_rss_feed(
-                self.db_repo.repo_id, self.db_repo.repo_name, 'rss')
+                mime_type, feed = generate_rss_feed.refresh(*args)
+            else:
+                mime_type, feed = generate_rss_feed(*args)
             log.debug(
                 'Repo RSS feed computed in %.3fs', inv_context_manager.compute_time)
 

rhodecode/apps/repository/views/repo_summary.py

@@ -88,14 +88,12 b' class RepoSummaryView(RepoAppView):'
         inv_context_manager = rc_cache.InvalidationContext(
             uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
         with inv_context_manager as invalidation_context:
-            # check for stored invalidation signal, and maybe purge the cache
-            # before computing it again
+            args = (db_repo.repo_id, db_repo.repo_name, renderer_type,)
+            # re-compute and store cache if we get invalidate signal
             if invalidation_context.should_invalidate():
-                generate_repo_readme.invalidate(
-                    db_repo.repo_id, db_repo.repo_name, renderer_type)
-
-            instance = generate_repo_readme(
-                db_repo.repo_id, db_repo.repo_name, renderer_type)
+                instance = generate_repo_readme.refresh(*args)
+            else:
+                instance = generate_repo_readme(*args)
 
             log.debug(
                 'Repo readme generated and computed in %.3fs',

rhodecode/lib/rc_cache/utils.py

@@ -227,14 +227,15 b' class InvalidationContext(object):'
         inv_context_manager = rc_cache.InvalidationContext(
             uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
         with inv_context_manager as invalidation_context:
-            # check for stored invalidation signal, and maybe purge the cache
-            # before computing it again
+            args = ('one', 'two')
+            # re-compute and store cache if we get invalidate signal
             if invalidation_context.should_invalidate():
-                heavy_compute.invalidate('some_name', 'param1', 'param2')
+                result = heavy_compute.refresh(*args)
+            else:
+                result = heavy_compute(*args)
 
-            result = heavy_compute('some_name', 'param1', 'param2')
             compute_time = inv_context_manager.compute_time
-            print(compute_time)
+            log.debug('result computed in %.3fs' ,compute_time)
 
         # To send global invalidation signal, simply run
         CacheKey.set_invalidate(invalidation_namespace)

rhodecode/model/db.py

@@ -2342,12 +2342,13 b' class Repository(Base, BaseModel):'
         inv_context_manager = rc_cache.InvalidationContext(
             uid=cache_namespace_uid, invalidation_namespace=invalidation_namespace)
         with inv_context_manager as invalidation_context:
-            # check for stored invalidation signal, and maybe purge the cache
-            # before computing it again
+            args = (self.repo_id,)
+            # re-compute and store cache if we get invalidate signal
             if invalidation_context.should_invalidate():
-                get_instance_cached.invalidate(self.repo_id)
-
-            instance = get_instance_cached(self.repo_id)
+                instance = get_instance_cached.refresh(*args)
+            else:
+                instance = get_instance_cached(*args)
+
             log.debug(
                 'Repo instance fetched in %.3fs', inv_context_manager.compute_time)
             return instance

rhodecode/tests/lib/test_libs.py

@@ -583,7 +583,8 b' def test_invalidation_context(baseapp):'
     with inv_context_manager as invalidation_context:
         should_invalidate = invalidation_context.should_invalidate()
         if should_invalidate:
-            _dummy_func.invalidate('some-key')
+            result = _dummy_func.refresh('some-key')
+        else:
         result = _dummy_func('some-key')
 
         assert isinstance(invalidation_context, rc_cache.FreshRegionCache)
@@ -608,7 +609,8 b' def test_invalidation_context(baseapp):'
     with inv_context_manager as invalidation_context:
         should_invalidate = invalidation_context.should_invalidate()
         if should_invalidate:
-            _dummy_func.invalidate('some-key')
+            result = _dummy_func.refresh('some-key')
+        else:
         result = _dummy_func('some-key')
 
         assert isinstance(invalidation_context, rc_cache.FreshRegionCache)
@@ -642,7 +644,8 b' def test_invalidation_context_exception_'
         with inv_context_manager as invalidation_context:
             should_invalidate = invalidation_context.should_invalidate()
             if should_invalidate:
-                _dummy_func.invalidate('some-key-2')
+                _dummy_func.refresh('some-key-2')
+            else:
             _dummy_func('some-key-2')
 
 
@@ -674,7 +677,8 b' def test_cache_invalidation_race_conditi'
         with inv_context_manager as invalidation_context:
             should_invalidate = invalidation_context.should_invalidate()
             if should_invalidate:
-                _dummy_func.invalidate('some-key-3')
+                _dummy_func.refresh('some-key-3')
+            else:
             _dummy_func('some-key-3')
 
         # Mark invalidation