mirror of
https://github.com/ProtonMail/proton-bridge.git
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83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright (c) 2023 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Proton Mail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package async
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import (
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"context"
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"sync"
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)
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// Abortable collects groups of functions that can be aborted by calling Abort.
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type Abortable struct {
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abortFunc []context.CancelFunc
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abortLock sync.RWMutex
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}
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func (a *Abortable) Do(ctx context.Context, fn func(context.Context)) {
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fn(a.newCancelCtx(ctx))
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}
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func (a *Abortable) Abort() {
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a.abortLock.RLock()
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defer a.abortLock.RUnlock()
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for _, fn := range a.abortFunc {
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fn()
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}
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}
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func (a *Abortable) newCancelCtx(ctx context.Context) context.Context {
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a.abortLock.Lock()
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defer a.abortLock.Unlock()
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ctx, cancel := context.WithCancel(ctx)
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a.abortFunc = append(a.abortFunc, cancel)
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return ctx
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}
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// RangeContext iterates over the given channel until the context is canceled or the
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// channel is closed.
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func RangeContext[T any](ctx context.Context, ch <-chan T, fn func(T)) {
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for {
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select {
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case v, ok := <-ch:
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if !ok {
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return
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}
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fn(v)
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case <-ctx.Done():
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return
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}
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}
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}
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// ForwardContext forwards all values from the src channel to the dst channel until the
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// context is canceled or the src channel is closed.
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func ForwardContext[T any](ctx context.Context, dst chan<- T, src <-chan T) {
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RangeContext(ctx, src, func(v T) {
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select {
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case dst <- v:
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case <-ctx.Done():
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}
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})
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}
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