我想添加持久性并从 json 初始化。我正在尝试保存/加载嵌套结构并收到“致命错误：堆栈溢出”。
据我了解，原因是父结构和子结构都有指向彼此的指针，并且 json 库正在进入循环。我需要指向 Parent 的指针，因为需要从孩子那里访问它。
我知道这是一个常见问题，解决它的最佳方法是什么？
type Mcloud struct {
Projects map[string]*Project `json:"Projects"`
Workdir string
}
type Project struct {
Name string
Networks map[string]Network
Parent *Mcloud
TFC TFConf
}
func newMcloud() *Mcloud {
mc := &Mcloud{
Projects: make(map[string]*Project),
Workdir: defaultWorkDir,
}
mc.load(statefile)
return mc
}
func (mc *Mcloud) addProject(n string) {
mc.Projects[n] = &Project{
Name: n,
Networks: make(map[string]Network),
Parent: mc,
}
mc.Projects[n].addTFConf()
}
//save saves state to statefile
func (mc *Mcloud) save(f string) (err error) {
if jsonState, err := json.Marshal(mc); err != nil {
fmt.Println("Was not able to marshal")
log.Fatal(err)
} else {
if err := ioutil.WriteFile(f, jsonState, 0666); err != nil {
fmt.Println("Was not able to write state to", f, "!")
log.Fatal(err)
}
fmt.Println("Save function saves: \n", mc, "to file ", f)
}
return err
}
func (mc *Mcloud) load(f string) (err error) {
var bytestate []byte
if bytestate, err = ioutil.ReadFile(f); err == nil {
err = json.Unmarshal(bytestate, &mc)
}
return err
}
获得
运行时：goroutine 堆栈超过 1000000000 字节限制致命错误：堆栈溢出
运行时堆栈：runtime.throw(0x149cdfe, 0xe) /usr/local/Cellar/go/1.11.1/libexec/src/runtime/panic.go:608 +0x72 runtime.newstack() /usr/local/Cellar/go /1.11.1/libexec/src/runtime/stack.go:1008 +0x729 runtime.morestack() /usr/local/Cellar/go/1.11.1/libexec/src/runtime/asm_amd64.s:429 +0x8f