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FILE / ScuroNeko/mtg
mtglib/internal/relay/relay.go
Исходный файл и его история в репозитории.
Alexey Dolotov
026ec74dfd
- Use sync.Pool for relay buffers instead of stack-allocated arrays. A [16379]byte on the goroutine stack forces Go to grow it to 32KB (next power of two). Pooled buffers keep goroutine stacks small. - Same fix for doppelganger write buffer ([16384]byte in conn.start). - Replace idle goroutines with context.AfterFunc in proxy.ServeConn and relay.Relay. These goroutines existed only to wait on ctx.Done() and close connections. AfterFunc achieves the same without allocating a goroutine until the context is actually cancelled. Net effect: at 3000 concurrent connections on a 1-vCPU/961MB VPS, the unmodified binary drops 246 connections and falls to 10 MB/s. With these changes: zero failures, 63 MB/s, 31% lower RSS. Closes #412
64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package relay
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import (
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"context"
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"errors"
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"io"
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"sync"
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"github.com/9seconds/mtg/v2/essentials"
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"github.com/9seconds/mtg/v2/mtglib/internal/tls"
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)
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var bufPool = sync.Pool{
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New: func() any {
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b := make([]byte, tls.MaxRecordPayloadSize)
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return &b
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},
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}
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func Relay(ctx context.Context, log Logger, telegramConn, clientConn essentials.Conn) {
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defer telegramConn.Close() //nolint: errcheck
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defer clientConn.Close() //nolint: errcheck
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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stop := context.AfterFunc(ctx, func() {
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telegramConn.Close() //nolint: errcheck
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clientConn.Close() //nolint: errcheck
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})
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defer stop()
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closeChan := make(chan struct{})
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go func() {
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defer close(closeChan)
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pump(log, telegramConn, clientConn, "client -> telegram")
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}()
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pump(log, clientConn, telegramConn, "telegram -> client")
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<-closeChan
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}
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func pump(log Logger, src, dst essentials.Conn, direction string) {
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bp := bufPool.Get().(*[]byte)
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defer bufPool.Put(bp)
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defer src.CloseRead() //nolint: errcheck
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defer dst.CloseWrite() //nolint: errcheck
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n, err := io.CopyBuffer(src, dst, *bp)
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switch {
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case err == nil:
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log.Printf("%s has been finished", direction)
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case errors.Is(err, io.EOF):
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log.Printf("%s has been finished because of EOF. Written %d bytes", direction, n)
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default:
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log.Printf("%s has been finished (written %d bytes): %v", direction, n, err)
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}
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}
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