Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/cluster_handlers.go

@@ -0,0 +1,75 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+import (
+	"encoding/json"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/plugin"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+func (s *Server) clusterInstallPluginHandler(msg *model.ClusterMessage) {
+	var data model.PluginEventData
+	if jsonErr := json.Unmarshal(msg.Data, &data); jsonErr != nil {
+		mlog.Warn("Failed to decode from JSON", mlog.Err(jsonErr))
+	}
+	s.Channels().installPluginFromData(data)
+}
+
+func (s *Server) clusterRemovePluginHandler(msg *model.ClusterMessage) {
+	var data model.PluginEventData
+	if jsonErr := json.Unmarshal(msg.Data, &data); jsonErr != nil {
+		mlog.Warn("Failed to decode from JSON", mlog.Err(jsonErr))
+	}
+	s.Channels().removePluginFromData(data)
+}
+
+func (s *Server) clusterPluginEventHandler(msg *model.ClusterMessage) {
+	if msg.Props == nil {
+		mlog.Warn("ClusterMessage.Props for plugin event should not be nil")
+		return
+	}
+	pluginID := msg.Props["PluginID"]
+	// if the plugin key is empty, the message might be coming from a product.
+	if pluginID == "" {
+		pluginID = msg.Props["ProductID"]
+	}
+	eventID := msg.Props["EventID"]
+	if pluginID == "" || eventID == "" {
+		mlog.Warn("Invalid ClusterMessage.Props values for plugin event",
+			mlog.String("plugin_id", pluginID), mlog.String("event_id", eventID))
+		return
+	}
+
+	channels, ok := s.products["channels"].(*Channels)
+	if !ok {
+		return
+	}
+
+	hooks, err := channels.HooksForPluginOrProduct(pluginID)
+	if err != nil {
+		mlog.Warn("Getting hooks for plugin failed", mlog.String("plugin_id", pluginID), mlog.Err(err))
+		return
+	}
+
+	hooks.OnPluginClusterEvent(&plugin.Context{}, model.PluginClusterEvent{
+		Id:   eventID,
+		Data: msg.Data,
+	})
+}
+
+// registerClusterHandlers registers the cluster message handlers that are handled by the server.
+//
+// The cluster event handlers are spread across this function and NewLocalCacheLayer.
+// Be careful to not have duplicated handlers here and there.
+func (s *Server) registerClusterHandlers() {
+
+	s.platform.RegisterClusterMessageHandler(model.ClusterEventInstallPlugin, s.clusterInstallPluginHandler)
+	s.platform.RegisterClusterMessageHandler(model.ClusterEventRemovePlugin, s.clusterRemovePluginHandler)
+	s.platform.RegisterClusterMessageHandler(model.ClusterEventPluginEvent, s.clusterPluginEventHandler)
+
+	s.platform.RegisterClusterHandlers()
+}