[GitHub] iilyak commented on a change in pull request #1629: handle db deletion in load validation funs

[GitBox <gi...@apache.org>]

iilyak commented on a change in pull request #1629: handle db deletion in load validation funs
URL: https://github.com/apache/couchdb/pull/1629#discussion_r225675253
 
 

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 File path: src/ddoc_cache/test/ddoc_cache_open_test.erl
 ##########
 @@ -0,0 +1,98 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(ddoc_cache_open_test).
+
+-export([
+    dbname/1,
+    ddocid/1,
+    recover/1,
+    insert/2
+]).
+
+-include_lib("couch/include/couch_db.hrl").
+-include_lib("eunit/include/eunit.hrl").
+-include("ddoc_cache_test.hrl").
+
+
+%% behaviour callbacks
+dbname(DbName) ->
+    DbName.
+
+ddocid(_) ->
+    no_ddocid.
+
+recover({deleted, _DbName}) ->
+    erlang:error(database_does_not_exist);
+recover(DbName) ->
+    ddoc_cache_entry_validation_funs:recover(DbName).
+
+insert(_, _) ->
+    ok.
+
+start_couch() ->
+    Ctx = ddoc_cache_tutil:start_couch(),
+    meck:new(ddoc_cache_entry_validation_funs, [passthrough]),
+    meck:expect(ddoc_cache_entry_validation_funs, recover,
+        ['_'], meck:passthrough()),
+    Ctx.
+
+
+stop_couch(Ctx) ->
+    meck:unload(),
+    ddoc_cache_tutil:stop_couch(Ctx).
+
+
+check_open_error_test_() ->
+    {
+        setup,
+        fun start_couch/0,
+        fun stop_couch/1,
+        {
+            with, [
+                fun should_return_database_does_not_exist/1,
+                fun should_not_call_recover_when_database_does_not_exist/1,
+                fun should_call_recover_when_needed/1,
+                fun should_not_crash_lru_process/1
+            ]
+        }
+    }.
+
+
+should_return_database_does_not_exist({DbName, _}) ->
+    ?assertError(
+        database_does_not_exist,
+        ddoc_cache_lru:open({?MODULE, {deleted, DbName}})).
+
+should_not_call_recover_when_database_does_not_exist({DbName, _}) ->
+    meck:reset(ddoc_cache_entry_validation_funs),
+    ?assertError(
+       database_does_not_exist,
+       ddoc_cache_lru:open({?MODULE, {deleted, DbName}})),
+    ?assertError(
+        timeout,
+        meck:wait(ddoc_cache_entry_validation_funs, recover, '_', 500)).
 
 Review comment:
   Good catch. Apparently the `meck:wait` function has two slightly different semantics depending on arity:
   - `meck:wait(foo, '_', '_', 1000)` - wait any number of calls for 1 second
   - `meck:wait(5, foo, '_', '_', 1000),` - wait for 5 calls and return (within 1 second)
   
   I.e. to avoid waiting we would need to change it to wait for 1 call.

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