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/store/localcachelayer/file_info_layer.go

@@ -0,0 +1,99 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package localcachelayer
+
+import (
+	"bytes"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store"
+)
+
+type LocalCacheFileInfoStore struct {
+	store.FileInfoStore
+	rootStore *LocalCacheStore
+}
+
+func (s *LocalCacheFileInfoStore) handleClusterInvalidateFileInfo(msg *model.ClusterMessage) {
+	if bytes.Equal(msg.Data, clearCacheMessageData) {
+		s.rootStore.fileInfoCache.Purge()
+		return
+	}
+	s.rootStore.fileInfoCache.Remove(string(msg.Data))
+}
+
+func (s LocalCacheFileInfoStore) GetForPost(postId string, readFromMaster, includeDeleted, allowFromCache bool) ([]*model.FileInfo, error) {
+	if !allowFromCache {
+		return s.FileInfoStore.GetForPost(postId, readFromMaster, includeDeleted, allowFromCache)
+	}
+
+	cacheKey := postId
+	if includeDeleted {
+		cacheKey += "_deleted"
+	}
+
+	var fileInfo []*model.FileInfo
+	if err := s.rootStore.doStandardReadCache(s.rootStore.fileInfoCache, cacheKey, &fileInfo); err == nil {
+		return fileInfo, nil
+	}
+
+	fileInfos, err := s.FileInfoStore.GetForPost(postId, readFromMaster, includeDeleted, allowFromCache)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(fileInfos) > 0 {
+		s.rootStore.doStandardAddToCache(s.rootStore.fileInfoCache, cacheKey, fileInfos)
+	}
+
+	return fileInfos, nil
+}
+
+func (s LocalCacheFileInfoStore) ClearCaches() {
+	s.rootStore.fileInfoCache.Purge()
+	if s.rootStore.metrics != nil {
+		s.rootStore.metrics.IncrementMemCacheInvalidationCounter("File Info Cache - Purge")
+	}
+}
+
+func (s LocalCacheFileInfoStore) InvalidateFileInfosForPostCache(postId string, deleted bool) {
+	cacheKey := postId
+	if deleted {
+		cacheKey += "_deleted"
+	}
+	s.rootStore.doInvalidateCacheCluster(s.rootStore.fileInfoCache, cacheKey)
+	if s.rootStore.metrics != nil {
+		s.rootStore.metrics.IncrementMemCacheInvalidationCounter("File Info Cache - Remove by PostId")
+	}
+}
+
+func (s LocalCacheFileInfoStore) GetStorageUsage(allowFromCache, includeDeleted bool) (int64, error) {
+	storageUsageKey := "storage_usage"
+	if includeDeleted {
+		storageUsageKey += "_deleted"
+	}
+
+	if !allowFromCache {
+		usage, err := s.FileInfoStore.GetStorageUsage(allowFromCache, includeDeleted)
+		if err != nil {
+			return 0, err
+		}
+
+		s.rootStore.doStandardAddToCache(s.rootStore.fileInfoCache, storageUsageKey, usage)
+		return usage, nil
+	}
+
+	var usage int64
+	if err := s.rootStore.doStandardReadCache(s.rootStore.fileInfoCache, storageUsageKey, &usage); err == nil {
+		return usage, nil
+	}
+
+	usage, err := s.FileInfoStore.GetStorageUsage(allowFromCache, includeDeleted)
+	if err != nil {
+		return 0, err
+	}
+
+	s.rootStore.doStandardAddToCache(s.rootStore.fileInfoCache, storageUsageKey, usage)
+	return usage, nil
+}