Setting up file store in constructor and not in init which is o… (mic…

…ro#1499)

defaults.go

@@ -10,7 +10,7 @@ import (
 	gcli "github.com/micro/go-micro/v2/client/grpc"
 	memTrace "github.com/micro/go-micro/v2/debug/trace/memory"
 	gsrv "github.com/micro/go-micro/v2/server/grpc"
-	fileStore "github.com/micro/go-micro/v2/store/file"
+	memoryStore "github.com/micro/go-micro/v2/store/memory"
 )
 
 func init() {
@@ -19,7 +19,7 @@ func init() {
 	// default server
 	server.DefaultServer = gsrv.NewServer()
 	// default store
-	store.DefaultStore = fileStore.NewStore()
+	store.DefaultStore = memoryStore.NewStore()
 	// set default trace
 	trace.DefaultTracer = memTrace.NewTracer()
 }

store/file/file.go

@@ -32,9 +32,7 @@ func NewStore(opts ...store.Option) store.Store {
 	s := &fileStore{
 		options: store.Options{},
 	}
-	for _, o := range opts {
-		o(&s.options)
-	}
+	s.init(opts...)
 	return s
 }
 
@@ -46,6 +44,10 @@ type fileStore struct {
 }
 
 func (m *fileStore) Init(opts ...store.Option) error {
+	return m.init(opts...)
+}
+
+func (m *fileStore) init(opts ...store.Option) error {
 	for _, o := range opts {
 		o(&m.options)
 	}
@@ -58,6 +60,9 @@ func (m *fileStore) Init(opts ...store.Option) error {
 	}
 	dir := filepath.Join(DefaultDir, "micro")
 	fname := m.options.Database + ".db"
+	// Ignoring this as the folder might exist.
+	// Reads/Writes updates will return with sensible error messages
+	// about the dir not existing in case this cannot create the path anyway
 	_ = os.Mkdir(dir, 0700)
 	m.dir = dir
 	m.fileName = fname