janl commented on a change in pull request #1602: Remove runtime
configurability of core system components
URL: https://github.com/apache/couchdb/pull/1602#discussion_r218133665
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File path: src/couch/src/couch_proc_manager.erl
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@@ -372,12 +372,59 @@ new_proc(Client) ->
end,
exit(Resp).
+get_env_for_spec(Spec, Target) ->
+ % loop over os:getenv(), match SPEC_TARGET
+ lists:filtermap(fun(VarName) ->
+ SpecStr = Spec ++ Target,
+ case string:tokens(VarName, "=") of
+ [SpecStr, Cmd] -> {true, Cmd};
+ _Else -> false
+ end
+ end, os:getenv()).
+
+get_query_server(LangStr) ->
+ % look for COUCH_QUERY_SERVER_LANGSTR in env
+ % if exists, return value, else undefined
+ UpperLangString = string:to_upper(LangStr),
+ case get_env_for_spec("COUCHDB_QUERY_SERVER_", UpperLangString) of
+ [] -> undefined;
+ [Command] -> Command
+ end.
+
+native_query_server_enabled() ->
+ % 1. [native_query_server] enable_erlang_query_server = true | false
+ % 2. if [native_query_server] erlang == {couch_native_process, start_link,
[]} -> pretend true as well
+ NativeEnabled = config:get_boolean("native_query_servers",
"enable_erlang_query_server", false),
+ NativeLegacyConfig = config:get("native_query_servers", "erlang", ""),
+ NativeLegacyEnabled = NativeLegacyConfig =:= "{couch_native_process,
start_link, []}",
+
+ % there surely is a more elegant way to do this that eludes me at present
+ case {NativeEnabled, NativeLegacyEnabled} of
Review comment:
omg thanks :D
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