PLT-6080 moving clustering to memberlist (#6499)

* PLT-6080 adding cluster discovery service

* Adding memberlist lib

* Adding memberlist lib

* WIP

* WIP

* WIP

* WIP

* Rolling back config changes

* Fixing make file

* Fixing config for cluster

* WIP

* Fixing system console for clustering

* Fixing default config

* Fixing config

* Fixing system console for clustering

* Tweaking hub setting

* Bumping up time

* merging vendor dir

* Updating vendor dir

* Fixing unit test

* Fixing bad merge

* Remove some testing code

* Moving comment

* PLT-6868 adding db ping retry

* Removing unused loc strings

* Adding defer to cancel

app/cluster_handlers.go

@@ -0,0 +1,77 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"strings"
+
+	"github.com/mattermost/platform/einterfaces"
+	"github.com/mattermost/platform/model"
+)
+
+func RegisterAllClusterMessageHandlers() {
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_PUBLISH, ClusterPublishHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_UPDATE_STATUS, ClusterUpdateStatusHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_ALL_CACHES, ClusterInvalidateAllCachesHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_REACTIONS, ClusterInvalidateCacheForReactionsHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_WEBHOOK, ClusterInvalidateCacheForWebhookHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_POSTS, ClusterInvalidateCacheForChannelPostsHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_MEMBERS_NOTIFY_PROPS, ClusterInvalidateCacheForChannelMembersNotifyPropHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_MEMBERS, ClusterInvalidateCacheForChannelMembersHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL_BY_NAME, ClusterInvalidateCacheForChannelByNameHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_CHANNEL, ClusterInvalidateCacheForChannelHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_INVALIDATE_CACHE_FOR_USER, ClusterInvalidateCacheForUserHandler)
+	einterfaces.GetClusterInterface().RegisterClusterMessageHandler(model.CLUSTER_EVENT_CLEAR_SESSION_CACHE_FOR_USER, ClusterClearSessionCacheForUserHandler)
+
+}
+
+func ClusterPublishHandler(msg *model.ClusterMessage) {
+	event := model.WebSocketEventFromJson(strings.NewReader(msg.Data))
+	PublishSkipClusterSend(event)
+}
+
+func ClusterUpdateStatusHandler(msg *model.ClusterMessage) {
+	status := model.StatusFromJson(strings.NewReader(msg.Data))
+	AddStatusCacheSkipClusterSend(status)
+}
+
+func ClusterInvalidateAllCachesHandler(msg *model.ClusterMessage) {
+	InvalidateAllCachesSkipSend()
+}
+
+func ClusterInvalidateCacheForReactionsHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForReactionsSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForWebhookHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForWebhookSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForChannelPostsHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForWebhookSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForChannelMembersNotifyPropHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForChannelMembersNotifyPropsSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForChannelMembersHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForChannelMembersSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForChannelByNameHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForChannelByNameSkipClusterSend(msg.Props["id"], msg.Props["name"])
+}
+
+func ClusterInvalidateCacheForChannelHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForChannelSkipClusterSend(msg.Data)
+}
+
+func ClusterInvalidateCacheForUserHandler(msg *model.ClusterMessage) {
+	InvalidateCacheForUserSkipClusterSend(msg.Data)
+}
+
+func ClusterClearSessionCacheForUserHandler(msg *model.ClusterMessage) {
+	ClearSessionCacheForUserSkipClusterSend(msg.Data)
+}