Add Store service for Focalboard multi-product architecture (#20568)

* add Store service

app/server.go

@@ -102,6 +102,7 @@ const (
 	LogKey           ServiceKey = "log"
 	HooksKey         ServiceKey = "hooks"
 	KVStoreKey       ServiceKey = "kvstore"
+	StoreKey         ServiceKey = "storekey"
 )
 
 type Server struct {
@@ -402,6 +403,7 @@ func NewServer(options ...Option) (*Server, error) {
 		LogKey:           s.GetLogger(),
 		CloudKey:         &cloudWrapper{cloud: s.Cloud},
 		KVStoreKey:       &kvStoreWrapper{srv: s},
+		StoreKey:         store.NewStoreServiceAdapter(s.Store),
 	}
 
 	// Step 8: Initialize products.

product/api.go

@@ -4,6 +4,7 @@
 package product
 
 import (
+	"database/sql"
 	"io"
 
 	"github.com/gorilla/mux"
@@ -167,3 +168,10 @@ type KVStoreService interface {
 type LogService interface {
 	mlog.LoggerIFace
 }
+
+// StoreService is the API for accessing the Store service APIs.
+//
+// The service shall be registered via app.StoreKey service key.
+type StoreService interface {
+	GetMasterDB() *sql.DB
+}

store/store.go

@@ -1021,3 +1021,18 @@ type SidebarCategorySearchOpts struct {
 	TeamID      string
 	ExcludeTeam bool
 }
+
+// StoreServiceAdapter provides a simple Store wrapper for use with products.
+type StoreServiceAdapter struct {
+	store Store
+}
+
+func NewStoreServiceAdapter(store Store) *StoreServiceAdapter {
+	return &StoreServiceAdapter{
+		store: store,
+	}
+}
+
+func (a *StoreServiceAdapter) GetMasterDB() *sql.DB {
+	return a.store.GetInternalMasterDB()
+}