feat: rest validation on http requests (#3041)

core/executors/periodicalexecutor.go

@@ -81,7 +81,7 @@ func (pe *PeriodicalExecutor) Flush() bool {
 	}())
 }
 
-// Sync lets caller to run fn thread-safe with pe, especially for the underlying container.
+// Sync lets caller run fn thread-safe with pe, especially for the underlying container.
 func (pe *PeriodicalExecutor) Sync(fn func()) {
 	pe.lock.Lock()
 	defer pe.lock.Unlock()

core/validation/validator.go

@@ -0,0 +1,7 @@
+package validation
+
+// Validator represents a validator.
+type Validator interface {
+	// Validate validates the value.
+	Validate() error
+}