add context helpers

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

logger/context.go

@@ -14,3 +14,13 @@ func FromContext(ctx context.Context) (Logger, bool) {
 func NewContext(ctx context.Context, l Logger) context.Context {
 	return context.WithValue(ctx, loggerKey{}, l)
 }
+
+// SetOption returns a function to setup a context with given value
+func SetOption(k, v interface{}) Option {
+	return func(o *Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

logger/options.go

@@ -69,12 +69,3 @@ func WithContext(ctx context.Context) Option {
 		args.Context = ctx
 	}
 }
-
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}