153 lines
3.5 KiB
Go
153 lines
3.5 KiB
Go
/*
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* Copyright (C) 2020-2022, IrineSistiana
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*
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* This file is part of mosdns.
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*
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* mosdns 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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* mosdns 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package transport
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import (
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"context"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/require"
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)
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type dummyEchoDnsConnOpt struct {
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exchangeErr error
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mcq int
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closed atomic.Bool
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wantConcurrentExchangeCall int
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waitingExchangeCall atomic.Int32
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unblockOnce sync.Once
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unblockExchange chan struct{}
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}
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type dummyEchoDnsConn struct {
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opt *dummyEchoDnsConnOpt
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m sync.Mutex
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reserved int
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}
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func (dc *dummyEchoDnsConn) ExchangeReserved(ctx context.Context, q []byte) (*[]byte, error) {
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defer dc.WithdrawReserved()
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if dc.opt.waitingExchangeCall.Add(1) == int32(dc.opt.wantConcurrentExchangeCall) {
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dc.opt.unblockOnce.Do(func() { close(dc.opt.unblockExchange) })
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}
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defer dc.opt.waitingExchangeCall.Add(-1)
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select {
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case <-ctx.Done():
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return nil, context.Cause(ctx)
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case <-dc.opt.unblockExchange:
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if dc.opt.exchangeErr != nil {
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return nil, dc.opt.exchangeErr
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}
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return copyMsg(q), nil
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}
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}
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func (dc *dummyEchoDnsConn) WithdrawReserved() {
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dc.m.Lock()
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defer dc.m.Unlock()
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dc.reserved--
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if dc.reserved < 0 {
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panic("negative reserved counter")
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}
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}
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func (dc *dummyEchoDnsConn) ReserveNewQuery() (_ ReservedExchanger, closed bool) {
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if dc.opt.closed.Load() {
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return nil, true
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}
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dc.m.Lock()
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defer dc.m.Unlock()
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if dc.reserved >= dc.opt.mcq {
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return nil, false
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}
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dc.reserved++
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return dc, false
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}
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func (dc *dummyEchoDnsConn) Close() error {
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return nil
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}
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func Test_PipelineTransport(t *testing.T) {
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const (
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mcq = 100
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wantConn = 10
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wantMaxConcurrentExchangeCall = mcq * wantConn
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)
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r := require.New(t)
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dcControl := &dummyEchoDnsConnOpt{
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mcq: mcq,
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unblockExchange: make(chan struct{}),
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wantConcurrentExchangeCall: wantMaxConcurrentExchangeCall,
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}
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po := PipelineOpts{
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DialContext: func(ctx context.Context) (DnsConn, error) { return &dummyEchoDnsConn{opt: dcControl}, nil },
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MaxConcurrentQueryWhileDialing: mcq,
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}
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pt := NewPipelineTransport(po)
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defer pt.Close()
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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q := new(dns.Msg)
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q.SetQuestion("test.", dns.TypeA)
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queryPayload, err := q.Pack()
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r.NoError(err)
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wg := new(sync.WaitGroup)
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for i := 0; i < wantMaxConcurrentExchangeCall; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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_, err := pt.ExchangeContext(ctx, queryPayload)
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if err != nil {
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t.Error(err)
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}
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}()
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if t.Failed() {
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break
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}
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}
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wg.Wait()
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pt.m.Lock()
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pl := len(pt.conns)
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pt.m.Unlock()
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r.Equal(wantConn, pl)
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dcControl.closed.Store(true)
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_, _ = pt.ExchangeContext(ctx, queryPayload) // remove all closed conn
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pt.m.Lock()
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pl = len(pt.conns)
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pt.m.Unlock()
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r.Equal(1, pl, "all connection should be remove then one will be opened")
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}
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