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Add specific error type for "operation already exists" error.

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PersistentVolume controller needs to know why scheduling a new operation has
failed - if the operation was already running or some other error happened.
This commit is contained in:
Jan Safranek 2016-05-16 10:43:42 +02:00
parent 9aa1a59443
commit e5bea6abba
2 changed files with 34 additions and 1 deletions
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29
pkg/util/goroutinemap/goroutinemap.go
View File

@ -62,7 +62,7 @@ func (grm *goRoutineMap) Run(operationName string, operation func() error) error
defer grm.Unlock()
if grm.operations[operationName] {
// Operation with name exists
return fmt.Errorf("Failed to create operation with name %q. An operation with that name already exists.", operationName)
return newAlreadyExistsError(operationName)
}
grm.operations[operationName] = true
@ -86,3 +86,30 @@ func (grm *goRoutineMap) operationComplete(operationName string) {
func (grm *goRoutineMap) Wait() {
grm.wg.Wait()
}
// alreadyExistsError is specific error returned when NewGoRoutine()
// detects that operation with given name is already running.
type alreadyExistsError struct {
operationName string
}
var _ error = alreadyExistsError{}
func (err alreadyExistsError) Error() string {
return fmt.Sprintf("Failed to create operation with name %q. An operation with that name already exists", err.operationName)
}
func newAlreadyExistsError(operationName string) error {
return alreadyExistsError{operationName}
}
// IsAlreadyExists returns true if an error returned from NewGoRoutine indicates
// that operation with the same name already exists.
func IsAlreadyExists(err error) bool {
switch err.(type) {
case alreadyExistsError:
return true
default:
return false
}
}

6
pkg/util/goroutinemap/goroutinemap_test.go
View File

@ -120,6 +120,9 @@ func Test_NewGoRoutineMap_Negative_SecondOpBeforeFirstCompletes(t *testing.T) {
if err2 == nil {
t.Fatalf("NewGoRoutine did not fail. Expected: <Failed to create operation with name \"%s\". An operation with that name already exists.> Actual: <no error>", operationName)
}
if !IsAlreadyExists(err2) {
t.Fatalf("NewGoRoutine did not return alreadyExistsError, got: %v", err2)
}
}
func Test_NewGoRoutineMap_Positive_ThirdOpAfterFirstCompletes(t *testing.T) {
@ -142,6 +145,9 @@ func Test_NewGoRoutineMap_Positive_ThirdOpAfterFirstCompletes(t *testing.T) {
if err2 == nil {
t.Fatalf("NewGoRoutine did not fail. Expected: <Failed to create operation with name \"%s\". An operation with that name already exists.> Actual: <no error>", operationName)
}
if !IsAlreadyExists(err2) {
t.Fatalf("NewGoRoutine did not return alreadyExistsError, got: %v", err2)
}
// Act
operation1DoneCh <- true // Force operation1 to complete