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state.go
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state.go
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package flowstate
import (
"context"
"time"
)
var _ context.Context = &StateCtx{}
type StateID string
type State struct {
ID StateID `json:"id"`
Rev int64 `json:"rev"`
Annotations map[string]string `json:"annotations"`
Labels map[string]string `json:"labels"`
CommittedAtUnixMilli int64 `json:"committed_at_unix_milli"`
Transition Transition `json:"transition"`
}
func (s *State) SetCommitedAt(at time.Time) {
s.CommittedAtUnixMilli = at.UnixMilli()
}
func (s *State) CommittedAt() time.Time {
return time.UnixMilli(s.CommittedAtUnixMilli)
}
func (s *State) CopyTo(to *State) State {
to.ID = s.ID
to.Rev = s.Rev
to.CommittedAtUnixMilli = s.CommittedAtUnixMilli
s.Transition.CopyTo(&to.Transition)
for k, v := range s.Annotations {
to.SetAnnotation(k, v)
}
for k, v := range s.Labels {
to.SetLabel(k, v)
}
return *to
}
func (s *State) CopyToCtx(to *StateCtx) *StateCtx {
s.CopyTo(&to.Committed)
s.CopyTo(&to.Current)
return to
}
func (s *State) SetAnnotation(name, value string) {
if s.Annotations == nil {
s.Annotations = make(map[string]string)
}
s.Annotations[name] = value
}
func (s *State) SetLabel(name, value string) {
if s.Labels == nil {
s.Labels = make(map[string]string)
}
s.Labels[name] = value
}
type StateCtx struct {
noCopy noCopy
Current State `json:"current"`
Committed State `json:"committed"`
// Transitions between committed and current states
Transitions []Transition `json:"transitions"`
e *Engine `json:"-"`
}
func (s *StateCtx) CopyTo(to *StateCtx) *StateCtx {
s.Current.CopyTo(&to.Current)
s.Committed.CopyTo(&to.Committed)
if cap(to.Transitions) >= len(s.Transitions) {
to.Transitions = to.Transitions[:len(s.Transitions)]
} else {
to.Transitions = make([]Transition, len(s.Transitions))
}
for idx := range s.Transitions {
s.Transitions[idx].CopyTo(&to.Transitions[idx])
}
return to
}
func (s *StateCtx) NewTo(id StateID, to *StateCtx) *StateCtx {
s.CopyTo(to)
to.Current.ID = id
to.Current.Rev = 0
to.Current.ID = id
to.Current.Rev = 0
return to
}
func (s *StateCtx) Deadline() (time.Time, bool) {
return time.Time{}, false
}
func (s *StateCtx) Done() <-chan struct{} {
if s.e == nil {
return nil
}
return s.e.doneCh
}
func (s *StateCtx) Err() error {
if s.e == nil {
return nil
}
select {
case <-s.e.doneCh:
return context.Canceled
default:
return nil
}
}
func (s *StateCtx) Value(key any) any {
key1, ok := key.(string)
if !ok {
return nil
}
return s.Current.Annotations[key1]
}