package task
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import (
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"context"
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"github.com/v2fly/v2ray-core/v5/common/signal/semaphore"
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)
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// OnSuccess executes g() after f() returns nil.
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func OnSuccess(f func() error, g func() error) func() error {
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return func() error {
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if err := f(); err != nil {
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return err
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}
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return g()
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}
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}
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// Run executes a list of tasks in parallel, returns the first error encountered or nil if all tasks pass.
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func Run(ctx context.Context, tasks ...func() error) error {
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n := len(tasks)
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s := semaphore.New(n)
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done := make(chan error, 1)
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for _, task := range tasks {
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<-s.Wait()
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go func(f func() error) {
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err := f()
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if err == nil {
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s.Signal()
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return
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}
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select {
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case done <- err:
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default:
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}
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}(task)
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}
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for i := 0; i < n; i++ {
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select {
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case err := <-done:
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return err
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case <-ctx.Done():
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return ctx.Err()
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case <-s.Wait():
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}
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}
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return nil
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}
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