mirror of https://github.com/Xhofe/alist
94 lines
1.6 KiB
Go
94 lines
1.6 KiB
Go
package errgroup
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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"github.com/avast/retry-go"
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)
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type token struct{}
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type Group struct {
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cancel func(error)
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ctx context.Context
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opts []retry.Option
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success uint64
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wg sync.WaitGroup
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sem chan token
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}
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func NewGroupWithContext(ctx context.Context, limit int, retryOpts ...retry.Option) (*Group, context.Context) {
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ctx, cancel := context.WithCancelCause(ctx)
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return (&Group{cancel: cancel, ctx: ctx, opts: append(retryOpts, retry.Context(ctx))}).SetLimit(limit), ctx
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}
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func (g *Group) done() {
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if g.sem != nil {
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<-g.sem
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}
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g.wg.Done()
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atomic.AddUint64(&g.success, 1)
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}
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func (g *Group) Wait() error {
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g.wg.Wait()
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return context.Cause(g.ctx)
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}
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func (g *Group) Go(f func(ctx context.Context) error) {
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if g.sem != nil {
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g.sem <- token{}
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}
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g.wg.Add(1)
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go func() {
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defer g.done()
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if err := retry.Do(func() error { return f(g.ctx) }, g.opts...); err != nil {
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g.cancel(err)
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}
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}()
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}
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func (g *Group) TryGo(f func(ctx context.Context) error) bool {
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if g.sem != nil {
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select {
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case g.sem <- token{}:
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default:
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return false
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}
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}
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g.wg.Add(1)
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go func() {
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defer g.done()
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if err := retry.Do(func() error { return f(g.ctx) }, g.opts...); err != nil {
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g.cancel(err)
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}
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}()
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return true
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}
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func (g *Group) SetLimit(n int) *Group {
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if len(g.sem) != 0 {
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panic(fmt.Errorf("errgroup: modify limit while %v goroutines in the group are still active", len(g.sem)))
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}
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if n > 0 {
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g.sem = make(chan token, n)
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} else {
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g.sem = nil
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}
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return g
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}
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func (g *Group) Success() uint64 {
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return atomic.LoadUint64(&g.success)
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}
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func (g *Group) Err() error {
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return context.Cause(g.ctx)
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}
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