132 lines
2.3 KiB
Go
132 lines
2.3 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"errors"
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"sync"
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"time"
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"code.gitea.io/gitea/modules/container"
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)
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var errChannelClosed = errors.New("channel is closed")
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type baseChannel struct {
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c chan []byte
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set container.Set[string]
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mu sync.Mutex
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isUnique bool
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}
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var _ baseQueue = (*baseChannel)(nil)
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func newBaseChannelGeneric(cfg *BaseConfig, unique bool) (baseQueue, error) {
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q := &baseChannel{c: make(chan []byte, cfg.Length), isUnique: unique}
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if unique {
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q.set = container.Set[string]{}
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}
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return q, nil
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}
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func newBaseChannelSimple(cfg *BaseConfig) (baseQueue, error) {
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return newBaseChannelGeneric(cfg, false)
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}
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func newBaseChannelUnique(cfg *BaseConfig) (baseQueue, error) {
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return newBaseChannelGeneric(cfg, true)
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}
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func (q *baseChannel) PushItem(ctx context.Context, data []byte) error {
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if q.c == nil {
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return errChannelClosed
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}
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if q.isUnique {
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q.mu.Lock()
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has := q.set.Contains(string(data))
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q.mu.Unlock()
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if has {
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return ErrAlreadyInQueue
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}
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}
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select {
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case q.c <- data:
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if q.isUnique {
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q.mu.Lock()
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q.set.Add(string(data))
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q.mu.Unlock()
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}
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return nil
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case <-time.After(pushBlockTime):
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return context.DeadlineExceeded
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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func (q *baseChannel) PopItem(ctx context.Context) ([]byte, error) {
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select {
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case data, ok := <-q.c:
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if !ok {
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return nil, errChannelClosed
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}
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q.mu.Lock()
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q.set.Remove(string(data))
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q.mu.Unlock()
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return data, nil
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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}
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func (q *baseChannel) HasItem(ctx context.Context, data []byte) (bool, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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if !q.isUnique {
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return false, nil
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}
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return q.set.Contains(string(data)), nil
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}
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func (q *baseChannel) Len(ctx context.Context) (int, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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if q.c == nil {
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return 0, errChannelClosed
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}
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return len(q.c), nil
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}
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func (q *baseChannel) Close() error {
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q.mu.Lock()
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defer q.mu.Unlock()
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close(q.c)
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if q.isUnique {
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q.set = container.Set[string]{}
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}
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return nil
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}
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func (q *baseChannel) RemoveAll(ctx context.Context) error {
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q.mu.Lock()
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defer q.mu.Unlock()
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for q.c != nil && len(q.c) > 0 {
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<-q.c
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}
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if q.isUnique {
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q.set = container.Set[string]{}
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}
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return nil
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}
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