mirror of https://github.com/gohugoio/hugo
94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rungroup
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import (
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"context"
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"golang.org/x/sync/errgroup"
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)
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// Group is a group of workers that can be used to enqueue work and wait for
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// them to finish.
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type Group[T any] interface {
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Enqueue(T) error
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Wait() error
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}
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type runGroup[T any] struct {
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ctx context.Context
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g *errgroup.Group
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ch chan T
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}
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// Config is the configuration for a new Group.
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type Config[T any] struct {
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NumWorkers int
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Handle func(context.Context, T) error
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}
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// Run creates a new Group with the given configuration.
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func Run[T any](ctx context.Context, cfg Config[T]) Group[T] {
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if cfg.NumWorkers <= 0 {
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cfg.NumWorkers = 1
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}
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if cfg.Handle == nil {
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panic("Handle must be set")
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}
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g, ctx := errgroup.WithContext(ctx)
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// Buffered for performance.
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ch := make(chan T, cfg.NumWorkers)
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for i := 0; i < cfg.NumWorkers; i++ {
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g.Go(func() error {
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for {
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select {
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case <-ctx.Done():
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return nil
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case v, ok := <-ch:
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if !ok {
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return nil
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}
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if err := cfg.Handle(ctx, v); err != nil {
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return err
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}
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}
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}
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})
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}
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return &runGroup[T]{
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ctx: ctx,
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g: g,
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ch: ch,
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}
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}
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// Enqueue enqueues a new item to be handled by the workers.
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func (r *runGroup[T]) Enqueue(t T) error {
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select {
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case <-r.ctx.Done():
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return nil
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case r.ch <- t:
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}
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return nil
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}
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// Wait waits for all workers to finish and returns the first error.
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func (r *runGroup[T]) Wait() error {
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close(r.ch)
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return r.g.Wait()
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}
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