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Remove dependency on
k8s.io/kubernetes (#2398)
* Remove dependency on `k8s.io/kubernetes` Signed-off-by: Jacob Salway <[email protected]> * Make code compliant with Apache 2.0 license Signed-off-by: Jacob Salway <[email protected]> --------- Signed-off-by: Jacob Salway <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| /* | ||
| Original code from Kubernetes (https://github.com/kubernetes/kubernetes) | ||
| https://github.com/kubernetes/kubernetes/blob/master/pkg/util/interrupt/interrupt.go | ||
| Only naming has been changed from the original implementation. | ||
| */ | ||
|
|
||
| package util | ||
|
|
||
| import ( | ||
| "os" | ||
| "os/signal" | ||
| "sync" | ||
| "syscall" | ||
| ) | ||
|
|
||
| // terminationSignals are signals that cause the program to exit in the | ||
| // supported platforms (linux, darwin, windows). | ||
| var terminationSignals = []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT} | ||
|
|
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| // InterruptHandler Handler guarantees execution of notifications after a critical section (the function passed | ||
| // to a Run method), even in the presence of process termination. It guarantees exactly once | ||
| // invocation of the provided notify functions. | ||
| type InterruptHandler struct { | ||
| notify []func() | ||
| final func(os.Signal) | ||
| once sync.Once | ||
| } | ||
|
|
||
| // NewInterruptHandler New creates a new handler that guarantees all notify functions are run after the critical | ||
| // section exits (or is interrupted by the OS), then invokes the final handler. If no final | ||
| // handler is specified, the default final is `os.Exit(1)`. A handler can only be used for | ||
| // one critical section. | ||
| func NewInterruptHandler(final func(os.Signal), notify ...func()) *InterruptHandler { | ||
| return &InterruptHandler{ | ||
| final: final, | ||
| notify: notify, | ||
| } | ||
| } | ||
|
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| // Close executes all the notification handlers if they have not yet been executed. | ||
| func (h *InterruptHandler) Close() { | ||
| h.once.Do(func() { | ||
| for _, fn := range h.notify { | ||
| fn() | ||
| } | ||
| }) | ||
| } | ||
|
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||
| // Signal is called when an os.Signal is received, and guarantees that all notifications | ||
| // are executed, then the final handler is executed. This function should only be called once | ||
| // per Handler instance. | ||
| func (h *InterruptHandler) Signal(s os.Signal) { | ||
| h.once.Do(func() { | ||
| for _, fn := range h.notify { | ||
| fn() | ||
| } | ||
| if h.final == nil { | ||
| os.Exit(1) | ||
| } | ||
| h.final(s) | ||
| }) | ||
| } | ||
|
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| // Run ensures that any notifications are invoked after the provided fn exits (even if the | ||
| // process is interrupted by an OS termination signal). Notifications are only invoked once | ||
| // per Handler instance, so calling Run more than once will not behave as the user expects. | ||
| func (h *InterruptHandler) Run(fn func() error) error { | ||
| ch := make(chan os.Signal, 1) | ||
| signal.Notify(ch, terminationSignals...) | ||
| defer func() { | ||
| signal.Stop(ch) | ||
| close(ch) | ||
| }() | ||
| go func() { | ||
| sig, ok := <-ch | ||
| if !ok { | ||
| return | ||
| } | ||
| h.Signal(sig) | ||
| }() | ||
| defer h.Close() | ||
| return fn() | ||
| } |