mirror of https://github.com/k3s-io/k3s
86 lines
2.3 KiB
Go
86 lines
2.3 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package proc
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import (
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"errors"
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"fmt"
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"k8s.io/kubernetes/contrib/mesos/pkg/runtime"
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)
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var (
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errProcessTerminated = errors.New("cannot execute action because process has terminated")
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errIllegalState = errors.New("illegal state, cannot execute action")
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closedErrChan <-chan error // singleton chan that's always closed
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)
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func init() {
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ch := make(chan error)
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close(ch)
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closedErrChan = ch
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}
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func IsProcessTerminated(err error) bool {
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return err == errProcessTerminated
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}
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func IsIllegalState(err error) bool {
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return err == errIllegalState
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}
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// OnError spawns a goroutine that waits for an error. if a non-nil error is read from
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// the channel then the handler func is invoked, otherwise (nil error or closed chan)
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// the handler is skipped. if a nil handler is specified then it's not invoked.
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// the signal chan that's returned closes once the error process logic (and handler,
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// if any) has completed.
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func OnError(ch <-chan error, f func(error), abort <-chan struct{}) <-chan struct{} {
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return runtime.After(func() {
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if ch == nil {
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return
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}
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select {
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case err, ok := <-ch:
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if ok && err != nil && f != nil {
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f(err)
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}
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case <-abort:
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if f != nil {
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f(errProcessTerminated)
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}
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}
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})
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}
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// ErrorChanf is a convenience func that returns a chan that yields an error
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// generated from the given msg format and args.
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func ErrorChanf(msg string, args ...interface{}) <-chan error {
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return ErrorChan(fmt.Errorf(msg, args...))
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}
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// ErrorChan is a convenience func that returns a chan that yields the given error.
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// If err is nil then a closed chan is returned.
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func ErrorChan(err error) <-chan error {
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if err == nil {
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return closedErrChan
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}
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ch := make(chan error, 1)
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ch <- err
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return ch
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}
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