core.portmanager: Fix race condition in initialization of SNI cert map

Under some circumstances when hosts and modules are loaded in some
certain order, entries end up missing from the SNI map. This manifests
in e.g. `curl https://localhost:5281/` giving an error about
"unrecognized name".

The `service` argument is `nil` when invoked from the "host-activated"
event, leading it to iterating over every service. And then it would not
be fetching e.g. `http_host` from the config, which explains why https
would sometimes not work due to the missing name entry.

Because when `service` is included, this limits the iteration to
matching entries, while also returning the same value as the `name` loop
variable.  Because `name == service when service != nil` we can use name
instead in the body of the loop.

1 files changed, 2 insertions, 2 deletions

diff --git a/core/portmanager.lua b/core/portmanager.lua
index dc0d0abc..e3bc4c49 100644
--- a/core/portmanager.lua
+++ b/core/portmanager.lua
@@ -237,8 +237,8 @@ local function add_sni_host(host, service)
 			local config_prefix = (active_service.config_prefix or name).."_";
 			if config_prefix == "_" then config_prefix = ""; end
 			local prefix_ssl_config = config.get(host, config_prefix.."ssl");
-			local alternate_host = service and config.get(host, service.."_host");
-			if not alternate_host and service == "https" then
+			local alternate_host = name and config.get(host, name.."_host");
+			if not alternate_host and name == "https" then
 				-- TODO should this be some generic thing? e.g. in the service definition
 				alternate_host = config.get(host, "http_host");
 			end