jiahuili430 commented on code in PR #5327:
URL: https://github.com/apache/couchdb/pull/5327#discussion_r1821794892
##########
src/couch_quickjs/test/couch_quickjs_tests.erl:
##########
@@ -60,9 +63,55 @@ t_bad_memory_limit(_) ->
?assertEqual(ExpectCmd, string:find(Cmd, ExpectCmd)),
?assertEqual(1, os_cmd(Cmd ++ " -V")).
+t_couch_jsengine_config_triggers_proc_server_reload(_) ->
+ case couch_server:with_spidermonkey() of
+ false ->
+ % Spidermonkey is not in the build at all, skip the test
+ ok;
+ true ->
+ OldVal = get_proc_manager_default_js(),
+ % In the test, set the engine to whatever is not the default
+ Toggle =
+ case couch_server:get_js_engine() of
+ <<"quickjs">> -> "spidermonkey";
+ <<"spidermonkey">> -> "quickjs"
+ end,
+
+ config:set("couchdb", "js_engine", Toggle, false),
+ % couch_server:get_js_engine/0 should be visible immediately
+ ?assertEqual(list_to_binary(Toggle), couch_server:get_js_engine()),
+
+ wait_until_proc_manager_updates(OldVal),
+ ?assertNotEqual(OldVal, get_proc_manager_default_js()),
+ NewVal = get_proc_manager_default_js(),
+
+ % Toggle back to the original default (test config:delete/3)
+ config:delete("couchdb", "js_engine", false),
+ wait_until_proc_manager_updates(NewVal),
+ ?assertNotEqual(NewVal, get_proc_manager_default_js()),
+ % We should be back to the original default
+ ?assertEqual(OldVal, get_proc_manager_default_js())
+ end.
+
os_cmd(Cmd) ->
Opts = [stream, {line, 4096}, binary, exit_status, hide],
Port = open_port({spawn, Cmd}, Opts),
receive
{Port, {exit_status, Status}} -> Status
end.
+
+wait_until_proc_manager_updates(OldVal) ->
+ WaitFun = fun() ->
+ case get_proc_manager_default_js() of
+ OldVal -> wait;
+ _ -> ok
+ end
+ end,
+ case test_util:wait(WaitFun, 5000) of
Review Comment:
Works as expected.
```erl
(node1@127.0.0.1)1> couch_server:get_js_engine().
<<"quickjs">>
(node1@127.0.0.1)2> config:set("couchdb", "js_engine", "spidermonkey").
ok
(node1@127.0.0.1)3> couch_server:get_js_engine().
<<"spidermonkey">>
(node1@127.0.0.1)4> config:set("couchdb", "js_engine", "quickjs").
ok
(node1@127.0.0.1)5> couch_server:get_js_engine().
<<"quickjs">>
```
Just curious what happens if I make a typo... Is that possible to avoid this
error?
```bash
(node1@127.0.0.1)6> config:set("couchdb", "js_engine", "spider_monkey").
ok
*** ERROR: Shell process terminated! (^G to start new job) ***
$ curl $DB
curl: (7) Failed to connect to 127.0.0.1 port 15984 after 0 ms: Couldn't
connect to server
```
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