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/platform/options.go

@@ -0,0 +1,114 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package platform
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/einterfaces"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store/localcachelayer"
+	"github.com/mattermost/mattermost-server/v6/server/config"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/filestore"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+type Option func(ps *PlatformService) error
+
+// By default, the app will use the store specified by the configuration. This allows you to
+// construct an app with a different store.
+//
+// The override parameter must be either a store.Store or func(App) store.Store().
+func StoreOverride(override any) Option {
+	return func(ps *PlatformService) error {
+		switch o := override.(type) {
+		case store.Store:
+			ps.newStore = func() (store.Store, error) {
+				return o, nil
+			}
+			return nil
+
+		case func(*PlatformService) store.Store:
+			ps.newStore = func() (store.Store, error) {
+				return o(ps), nil
+			}
+			return nil
+
+		default:
+			return errors.New("invalid StoreOverride")
+		}
+	}
+}
+
+func StoreOverrideWithCache(override store.Store) Option {
+	return func(ps *PlatformService) error {
+		ps.newStore = func() (store.Store, error) {
+			lcl, err := localcachelayer.NewLocalCacheLayer(override, ps.metricsIFace, ps.clusterIFace, ps.cacheProvider)
+			if err != nil {
+				return nil, err
+			}
+			return lcl, nil
+		}
+
+		return nil
+	}
+}
+
+// Config applies the given config dsn, whether a path to config.json
+// or a database connection string. It receives as well a set of
+// custom defaults that will be applied for any unset property of the
+// config loaded from the dsn on top of the normal defaults
+func Config(dsn string, readOnly bool, configDefaults *model.Config) Option {
+	return func(ps *PlatformService) error {
+		configStore, err := config.NewStoreFromDSN(dsn, readOnly, configDefaults, true)
+		if err != nil {
+			return fmt.Errorf("failed to apply Config option: %w", err)
+		}
+
+		ps.configStore = configStore
+
+		return nil
+	}
+}
+
+func SetFileStore(filestore filestore.FileBackend) Option {
+	return func(ps *PlatformService) error {
+		ps.filestore = filestore
+		return nil
+	}
+}
+
+// ConfigStore applies the given config store, typically to replace the traditional sources with a memory store for testing.
+func ConfigStore(configStore *config.Store) Option {
+	return func(ps *PlatformService) error {
+		ps.configStore = configStore
+
+		return nil
+	}
+}
+
+func StartMetrics() Option {
+	return func(ps *PlatformService) error {
+		ps.startMetrics = true
+		return nil
+	}
+}
+
+func SetLogger(logger *mlog.Logger) Option {
+	return func(ps *PlatformService) error {
+		ps.SetLogger(logger)
+
+		return nil
+	}
+}
+
+func SetCluster(cluster einterfaces.ClusterInterface) Option {
+	return func(ps *PlatformService) error {
+		ps.clusterIFace = cluster
+		return nil
+	}
+}