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123 lines
2.1 KiB
Go
123 lines
2.1 KiB
Go
package exegroup
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import (
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"context"
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"fmt"
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"time"
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)
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type Group struct {
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actors []*Actor
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cfg config
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}
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func New(opts ...Option) *Group {
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cfg := config{}
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for _, opt := range opts {
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opt.apply(&cfg)
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}
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return &Group{
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cfg: cfg,
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}
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}
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func Default(opts ...Option) *Group {
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g := New(opts...)
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g.New().WithName("signal").WithGo(HandleSignal())
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return g
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}
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func (g *Group) New() *Actor {
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actor := NewActor().WithName(fmt.Sprintf("actor-%03d", len(g.actors)+1))
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g.actors = append(g.actors, actor)
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return actor
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}
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func (g *Group) Run(ctx context.Context) error {
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g.validate()
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ctx, cancel := context.WithCancel(ctx)
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c := make(chan error, len(g.actors))
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g.start(ctx, c)
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return g.wait(c, cancel)
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}
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func (g *Group) validate() {
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if len(g.actors) == 0 {
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panic("no actor")
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}
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for _, actor := range g.actors {
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if actor.goFunc == nil {
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panic(actor.name + "has nil goFunc")
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}
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}
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}
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func (g *Group) start(ctx context.Context, c chan error) {
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for _, actor := range g.actors {
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go func(actor *Actor) {
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var err error
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defer func() {
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if v := recover(); v != nil {
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err = fmt.Errorf("%v", v)
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}
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c <- err
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}()
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err = actor.goFunc(ctx)
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}(actor)
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}
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}
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func (g *Group) wait(c chan error, cancel context.CancelFunc) (err error) {
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err = <-c
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cancel()
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ctx := context.Background()
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if g.cfg.stopTimeout > 0 {
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ctx, cancel = context.WithTimeout(context.Background(), g.cfg.stopTimeout)
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defer cancel()
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}
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for _, m := range g.actors {
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if m.stopFunc != nil {
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if g.cfg.concurrentStop {
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go m.stopFunc(ctx)
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} else {
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m.stopFunc(ctx)
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}
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}
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}
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for i := 1; i < len(g.actors); i++ {
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select {
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case <-c:
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case <-ctx.Done():
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return
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}
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}
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return
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}
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type config struct {
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concurrentStop bool
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stopTimeout time.Duration
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}
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type Option interface {
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apply(cfg *config)
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}
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type optionFunc func(cfg *config)
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func (fn optionFunc) apply(cfg *config) {
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fn(cfg)
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}
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func WithConcurrentStop() Option {
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return optionFunc(func(cfg *config) {
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cfg.concurrentStop = true
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})
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}
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func WithStopTimeout(d time.Duration) Option {
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return optionFunc(func(cfg *config) {
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cfg.stopTimeout = d
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})
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}
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