Move setting plugin helpers to a seperate function to avoid breaking changes. (#10809)

plugin/client.go

@@ -17,11 +17,13 @@ const (
 // Call this when your plugin is ready to start.
 func ClientMain(pluginImplementation interface{}) {
 	if impl, ok := pluginImplementation.(interface {
-		SetAPI(api API, helpers Helpers)
+		SetAPI(api API)
+		SetHelpers(helpers Helpers)
 	}); !ok {
 		panic("Plugin implementation given must embed plugin.MattermostPlugin")
 	} else {
-		impl.SetAPI(nil, nil)
+		impl.SetAPI(nil)
+		impl.SetHelpers(nil)
 	}
 
 	pluginMap := map[string]plugin.Plugin{
@@ -42,7 +44,11 @@ type MattermostPlugin struct {
 
 // SetAPI persists the given API interface to the plugin. It is invoked just prior to the
 // OnActivate hook, exposing the API for use by the plugin.
-func (p *MattermostPlugin) SetAPI(api API, helpers Helpers) {
+func (p *MattermostPlugin) SetAPI(api API) {
 	p.API = api
+}
+
+// SetHelpers does the same thing as SetAPI except for the plugin helpers.
+func (p *MattermostPlugin) SetHelpers(helpers Helpers) {
 	p.Helpers = helpers
 }