fix(storage): only log warning if flushing merged servers to file fails

internal/cli/nooplogger.go

@@ -7,3 +7,4 @@ func newNoopLogger() *noopLogger {
 }
 
 func (l *noopLogger) Info(string) {}
+func (l *noopLogger) Warn(string) {}

internal/storage/mocks_generate_test.go

@@ -1,3 +1,3 @@
 package storage
 
-//go:generate mockgen -destination=mocks_test.go -package $GOPACKAGE . Infoer
+//go:generate mockgen -destination=mocks_test.go -package $GOPACKAGE . Logger

internal/storage/mocks_test.go

@@ -1,5 +1,5 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/qdm12/gluetun/internal/storage (interfaces: Infoer)
+// Source: github.com/qdm12/gluetun/internal/storage (interfaces: Logger)
 
 // Package storage is a generated GoMock package.
 package storage
@@ -10,37 +10,49 @@ import (
 	gomock "github.com/golang/mock/gomock"
 )
 
-// MockInfoer is a mock of Infoer interface.
-type MockInfoer struct {
+// MockLogger is a mock of Logger interface.
+type MockLogger struct {
 	ctrl     *gomock.Controller
-	recorder *MockInfoerMockRecorder
+	recorder *MockLoggerMockRecorder
 }
 
-// MockInfoerMockRecorder is the mock recorder for MockInfoer.
-type MockInfoerMockRecorder struct {
-	mock *MockInfoer
+// MockLoggerMockRecorder is the mock recorder for MockLogger.
+type MockLoggerMockRecorder struct {
+	mock *MockLogger
 }
 
-// NewMockInfoer creates a new mock instance.
-func NewMockInfoer(ctrl *gomock.Controller) *MockInfoer {
-	mock := &MockInfoer{ctrl: ctrl}
-	mock.recorder = &MockInfoerMockRecorder{mock}
+// NewMockLogger creates a new mock instance.
+func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
+	mock := &MockLogger{ctrl: ctrl}
+	mock.recorder = &MockLoggerMockRecorder{mock}
 	return mock
 }
 
 // EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockInfoer) EXPECT() *MockInfoerMockRecorder {
+func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
 	return m.recorder
 }
 
 // Info mocks base method.
-func (m *MockInfoer) Info(arg0 string) {
+func (m *MockLogger) Info(arg0 string) {
 	m.ctrl.T.Helper()
 	m.ctrl.Call(m, "Info", arg0)
 }
 
 // Info indicates an expected call of Info.
-func (mr *MockInfoerMockRecorder) Info(arg0 interface{}) *gomock.Call {
+func (mr *MockLoggerMockRecorder) Info(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Info", reflect.TypeOf((*MockInfoer)(nil).Info), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Info", reflect.TypeOf((*MockLogger)(nil).Info), arg0)
+}
+
+// Warn mocks base method.
+func (m *MockLogger) Warn(arg0 string) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Warn", arg0)
+}
+
+// Warn indicates an expected call of Warn.
+func (mr *MockLoggerMockRecorder) Warn(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Warn", reflect.TypeOf((*MockLogger)(nil).Warn), arg0)
 }

internal/storage/read_test.go

@@ -95,7 +95,7 @@ func Test_extractServersFromBytes(t *testing.T) {
 			t.Parallel()
 			ctrl := gomock.NewController(t)
 
-			logger := NewMockInfoer(ctrl)
+			logger := NewMockLogger(ctrl)
 			var previousLogCall *gomock.Call
 			for _, logged := range testCase.logged {
 				call := logger.EXPECT().Info(logged)

internal/storage/storage.go

@@ -13,18 +13,20 @@ type Storage struct {
 	// the embedded JSON file on every call to the
 	// SyncServers method.
 	hardcodedServers models.AllServers
-	logger           Infoer
+	logger           Logger
 	filepath         string
 }
 
-type Infoer interface {
+type Logger interface {
 	Info(s string)
+	Warn(s string)
 }
 
 // New creates a new storage and reads the servers from the
 // embedded servers file and the file on disk.
-// Passing an empty filepath disables writing servers to a file.
-func New(logger Infoer, filepath string) (storage *Storage, err error) {
+// Passing an empty filepath disables the reading and writing of
+// servers.
+func New(logger Logger, filepath string) (storage *Storage, err error) {
 	// A unit test prevents any error from being returned
 	// and ensures all providers are part of the servers returned.
 	hardcodedServers, _ := parseHardcodedServers()

internal/storage/sync.go

@@ -52,7 +52,7 @@ func (s *Storage) syncServers() (err error) {
 
 	err = s.flushToFile(s.filepath)
 	if err != nil {
-		return fmt.Errorf("writing servers to file: %w", err)
+		s.logger.Warn("failed writing servers to file: " + err.Error())
 	}
 	return nil
 }