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Allow nil functions for modules

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This commit is contained in:
Daniel 2018-10-22 17:06:27 +02:00
parent ea9592a536
commit ddc5465b08
1 changed files with 16 additions and 0 deletions
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16
modules/modules.go
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@ -33,6 +33,10 @@ type Module struct {
dependencies []string dependencies []string
} }
func dummyAction() error {
return nil
}
// Register registers a new module. // Register registers a new module.
func Register(name string, prep, start, stop func() error, dependencies ...string) *Module { func Register(name string, prep, start, stop func() error, dependencies ...string) *Module {
newModule := &Module{ newModule := &Module{
@ -43,6 +47,18 @@ func Register(name string, prep, start, stop func() error, dependencies ...strin
stop: stop, stop: stop,
dependencies: dependencies, dependencies: dependencies,
} }
// replace nil arguments with dummy action
if newModule.prep == nil {
newModule.prep = dummyAction
}
if newModule.start == nil {
newModule.start = dummyAction
}
if newModule.stop == nil {
newModule.stop = dummyAction
}
modulesLock.Lock() modulesLock.Lock()
defer modulesLock.Unlock() defer modulesLock.Unlock()
modulesOrder = append(modulesOrder, newModule) modulesOrder = append(modulesOrder, newModule)