mirror of
https://github.com/etcd-io/etcd.git
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84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package runtime
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import (
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"context"
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"fmt"
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"sync"
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)
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type Failpoint struct {
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cmu sync.RWMutex
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ctx context.Context
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cancel context.CancelFunc
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donec chan struct{}
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released bool
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mu sync.RWMutex
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t *terms
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}
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func NewFailpoint(pkg, name string, goFailGo bool) *Failpoint {
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fp := &Failpoint{}
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if goFailGo {
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fp.ctx, fp.cancel = context.WithCancel(context.Background())
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fp.donec = make(chan struct{})
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}
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register(pkg+"/"+name, fp)
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return fp
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}
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// Acquire gets evalutes the failpoint terms; if the failpoint
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// is active, it will return a value. Otherwise, returns a non-nil error.
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func (fp *Failpoint) Acquire() (interface{}, error) {
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fp.mu.RLock()
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if fp.t == nil {
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fp.mu.RUnlock()
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return nil, ErrDisabled
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}
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v, err := fp.t.eval()
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if v == nil {
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err = ErrDisabled
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}
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if err != nil {
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fp.mu.RUnlock()
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}
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return v, err
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}
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// Release is called when the failpoint exists.
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func (fp *Failpoint) Release() {
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fp.cmu.RLock()
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ctx := fp.ctx
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donec := fp.donec
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fp.cmu.RUnlock()
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if ctx != nil && !fp.released {
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<-ctx.Done()
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select {
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case <-donec:
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default:
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close(donec)
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}
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}
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fp.mu.RUnlock()
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}
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// BadType is called when the failpoint evaluates to the wrong type.
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func (fp *Failpoint) BadType(v interface{}, t string) {
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fmt.Printf("failpoint: %q got value %v of type \"%T\" but expected type %q\n", fp.t.fpath, v, v, t)
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}
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