nickva commented on code in PR #5601:
URL: https://github.com/apache/couchdb/pull/5601#discussion_r2216377711
##########
src/nouveau/src/nouveau_gun.erl:
##########
@@ -36,20 +36,32 @@
-define(NOUVEAU_HOST_HEADER, nouveau_host_header).
+-record(state, {
+ enabled,
+ url
+}).
+
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
host_header() ->
persistent_term:get(?NOUVEAU_HOST_HEADER).
init(_) ->
+ Enabled = nouveau:enabled(),
URL = nouveau_util:nouveau_url(),
- case start_gun(URL) of
- {ok, _PoolPid} ->
- ok = config:listen_for_changes(?MODULE, URL),
- {ok, nil};
- {error, Reason} ->
- {error, Reason}
+ State = #state{enabled = Enabled, url = URL},
+ ok = config:listen_for_changes(?MODULE, State),
+ if
+ Enabled ->
+ case start_gun(URL) of
+ {ok, _PoolPid} ->
+ {ok, nil};
+ {error, Reason} ->
+ {error, Reason}
+ end;
+ true ->
+ {ok, nil}
Review Comment:
Since we have to run basically the same logic in init and on reconfigure
maybe just have a single `maybe_start()` or `reconfigure()` function that keeps
track of the `StartedUrl` and on reconfigure we check:
```erlang
case {Enabled, StartedUrl} of
{true, undefined} -> start(Url), StartedUrl = Url;
{true, StartedUrl != Url} -> stop(), start(Url), StartedUrl = Url;
{false, StartedUrl != undefined} -> stop(), StartedUrl = undefined;
{true, Url = StartedUrl} -> ok;
{false, _} ok
}
```
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