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			97 lines
		
	
	
		
			2.6 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
			
		
		
	
	
			97 lines
		
	
	
		
			2.6 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
package backoff
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import (
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	"context"
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	"fmt"
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	"sync"
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	"testing"
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	"time"
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	"github.com/libp2p/go-libp2p/core/host"
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	"github.com/libp2p/go-libp2p/core/peer"
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	bhost "github.com/libp2p/go-libp2p/p2p/host/blank"
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	swarmt "github.com/libp2p/go-libp2p/p2p/net/swarm/testing"
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	"github.com/stretchr/testify/require"
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)
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type maxDialHost struct {
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	host.Host
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	mux            sync.Mutex
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	timesDialed    map[peer.ID]int
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	maxTimesToDial map[peer.ID]int
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}
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func (h *maxDialHost) Connect(ctx context.Context, ai peer.AddrInfo) error {
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	pid := ai.ID
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	h.mux.Lock()
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	defer h.mux.Unlock()
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	numDials := h.timesDialed[pid]
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	numDials += 1
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	h.timesDialed[pid] = numDials
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	if maxDials, ok := h.maxTimesToDial[pid]; ok && numDials > maxDials {
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		return fmt.Errorf("should not be dialing peer %s", pid.String())
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	}
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	return h.Host.Connect(ctx, ai)
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}
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func getNetHosts(t *testing.T, n int) []host.Host {
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	var out []host.Host
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	for i := 0; i < n; i++ {
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		netw := swarmt.GenSwarm(t)
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		h := bhost.NewBlankHost(netw)
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		t.Cleanup(func() { h.Close() })
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		out = append(out, h)
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	}
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	return out
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}
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func loadCh(peers []host.Host) <-chan peer.AddrInfo {
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	ch := make(chan peer.AddrInfo, len(peers))
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	for _, p := range peers {
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		ch <- p.Peerstore().PeerInfo(p.ID())
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	}
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	close(ch)
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	return ch
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}
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func TestBackoffConnector(t *testing.T) {
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	hosts := getNetHosts(t, 5)
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	primary := &maxDialHost{
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		Host:        hosts[0],
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		timesDialed: make(map[peer.ID]int),
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		maxTimesToDial: map[peer.ID]int{
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			hosts[1].ID(): 1,
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			hosts[2].ID(): 2,
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		},
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	}
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	bc, err := NewBackoffConnector(primary, 10, time.Minute, NewFixedBackoff(250*time.Millisecond))
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	require.NoError(t, err)
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	bc.Connect(context.Background(), loadCh(hosts))
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	require.Eventually(t, func() bool { return len(primary.Network().Peers()) == len(hosts)-1 }, 3*time.Second, 10*time.Millisecond)
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	time.Sleep(100 * time.Millisecond) // give connection attempts time to complete (relevant when using multiple transports)
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	for _, c := range primary.Network().Conns() {
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		c.Close()
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	}
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	require.Eventually(t, func() bool { return len(primary.Network().Peers()) == 0 }, 3*time.Second, 10*time.Millisecond)
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	bc.Connect(context.Background(), loadCh(hosts))
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	require.Empty(t, primary.Network().Peers(), "shouldn't be connected to any peers")
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	time.Sleep(time.Millisecond * 500)
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	bc.Connect(context.Background(), loadCh(hosts))
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	require.Eventually(t, func() bool { return len(primary.Network().Peers()) == len(hosts)-2 }, 3*time.Second, 10*time.Millisecond)
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	// make sure we actually don't connect to host 1 any more
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	time.Sleep(100 * time.Millisecond)
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	require.Len(t, primary.Network().Peers(), len(hosts)-2, "wrong number of connections")
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}
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