forked from wrenn/wrenn
pptx704
1826af37a5
64-entry buffer was too small for high-throughput PTY output (e.g. ls -laihR /). The consumer couldn't drain fast enough over the RPC stream, causing the non-blocking send fallback to silently discard data. 4096 entries (~64MB at 16KB/chunk) handles sustained output without drops while still preventing deadlock on stuck consumers.
80 lines
1.2 KiB
Go
80 lines
1.2 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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package handler
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import (
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"sync"
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"sync/atomic"
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)
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type MultiplexedChannel[T any] struct {
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Source chan T
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channels []chan T
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mu sync.RWMutex
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exited atomic.Bool
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}
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func NewMultiplexedChannel[T any](buffer int) *MultiplexedChannel[T] {
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c := &MultiplexedChannel[T]{
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channels: nil,
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Source: make(chan T, buffer),
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}
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go func() {
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for v := range c.Source {
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c.mu.RLock()
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for _, cons := range c.channels {
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select {
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case cons <- v:
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default:
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// Consumer not reading — skip to prevent deadlock
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}
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}
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c.mu.RUnlock()
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}
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c.exited.Store(true)
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for _, cons := range c.channels {
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close(cons)
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}
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}()
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return c
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}
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func (m *MultiplexedChannel[T]) Fork() (chan T, func()) {
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if m.exited.Load() {
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ch := make(chan T)
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close(ch)
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return ch, func() {}
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}
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m.mu.Lock()
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defer m.mu.Unlock()
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consumer := make(chan T, 4096)
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m.channels = append(m.channels, consumer)
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return consumer, func() {
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m.remove(consumer)
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}
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}
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func (m *MultiplexedChannel[T]) remove(consumer chan T) {
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m.mu.Lock()
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defer m.mu.Unlock()
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for i, ch := range m.channels {
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if ch == consumer {
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m.channels = append(m.channels[:i], m.channels[i+1:]...)
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return
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}
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}
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}
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