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// Copyright 2016 CoreOS, Inc.
//
// 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.
package runtime
import (
"fmt"
"os"
"strings"
"sync"
)
var (
ErrNoExist = fmt.Errorf("failpoint: failpoint does not exist")
ErrDisabled = fmt.Errorf("failpoint: failpoint is disabled")
failpoints map[string]*Failpoint
failpointsMu sync.RWMutex
envTerms map[string]string
)
func init() {
failpoints = make(map[string]*Failpoint)
envTerms = make(map[string]string)
if s := os.Getenv("GOFAIL_FAILPOINTS"); len(s) > 0 {
if fpMap, err := parseFailpoints(s); err != nil {
fmt.Printf("fail to parse failpoint: %v\n", err)
os.Exit(1)
} else {
envTerms = fpMap
}
}
if s := os.Getenv("GOFAIL_HTTP"); len(s) > 0 {
if err := serve(s); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
}
func parseFailpoints(fps string) (map[string]string, error) {
// The format is <FAILPOINT>=<TERMS>[;<FAILPOINT>=<TERMS>]*
fpMap := map[string]string{}
for _, fp := range strings.Split(fps, ";") {
if len(fp) == 0 {
continue
}
fpTerm := strings.Split(fp, "=")
if len(fpTerm) != 2 {
err := fmt.Errorf("bad failpoint %q", fp)
return nil, err
}
fpMap[fpTerm[0]] = fpTerm[1]
}
return fpMap, nil
}
// Enable sets a failpoint to a given failpoint description.
func Enable(name, inTerms string) error {
failpointsMu.Lock()
defer failpointsMu.Unlock()
return enable(name, inTerms)
}
// enable enables a failpoint
func enable(name, inTerms string) error {
fp := failpoints[name]
if fp == nil {
return ErrNoExist
}
t, err := newTerms(name, inTerms)
if err != nil {
fmt.Printf("failed to enable \"%s=%s\" (%v)\n", name, inTerms, err)
return err
}
fp.t = t
return nil
}
// Disable stops a failpoint from firing.
func Disable(name string) error {
failpointsMu.Lock()
defer failpointsMu.Unlock()
return disable(name)
}
func disable(name string) error {
fp := failpoints[name]
if fp == nil {
return ErrNoExist
}
if fp.t == nil {
return ErrDisabled
}
fp.t = nil
return nil
}
// Status gives the current setting for the failpoint
func Status(failpath string) (string, error) {
failpointsMu.Lock()
defer failpointsMu.Unlock()
return status(failpath)
}
func status(failpath string) (string, error) {
fp := failpoints[failpath]
if fp == nil {
return "", ErrNoExist
}
t := fp.t
if t == nil {
return "", ErrDisabled
}
return t.desc, nil
}
func List() []string {
failpointsMu.Lock()
defer failpointsMu.Unlock()
return list()
}
func list() []string {
ret := make([]string, 0, len(failpoints))
for fp := range failpoints {
ret = append(ret, fp)
}
return ret
}
func register(name string) *Failpoint {
failpointsMu.Lock()
defer failpointsMu.Unlock()
if _, ok := failpoints[name]; ok {
panic(fmt.Sprintf("failpoint name %s is already registered.", name))
}
fp := &Failpoint{}
failpoints[name] = fp
if t, ok := envTerms[name]; ok {
enable(name, t)
}
return fp
}
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