autopilot/agent_test: test that agent recovers from initial empty graph
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@ -1183,3 +1183,117 @@ func TestAgentPendingOpenChannel(t *testing.T) {
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default:
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}
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}
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// TestAgentOnNodeUpdates tests that the agent will wake up in response to the
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// OnNodeUpdates signal. This is useful in ensuring that autopilot is always
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// pulling in the latest graph updates into its decision making. It also
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// prevents the agent from stalling after an initial attempt that finds no nodes
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// in the graph.
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func TestAgentOnNodeUpdates(t *testing.T) {
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t.Parallel()
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// First, we'll create all the dependencies that we'll need in order to
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// create the autopilot agent.
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self, err := randKey()
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if err != nil {
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t.Fatalf("unable to generate key: %v", err)
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}
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heuristic := &mockHeuristic{
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moreChansResps: make(chan moreChansResp),
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directiveResps: make(chan []AttachmentDirective),
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}
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chanController := &mockChanController{
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openChanSignals: make(chan openChanIntent),
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}
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memGraph, _, _ := newMemChanGraph()
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// The wallet will start with 6 BTC available.
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const walletBalance = btcutil.SatoshiPerBitcoin * 6
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// With the dependencies we created, we can now create the initial
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// agent itself.
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cfg := Config{
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Self: self,
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Heuristic: heuristic,
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ChanController: chanController,
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WalletBalance: func() (btcutil.Amount, error) {
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return walletBalance, nil
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},
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Graph: memGraph,
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MaxPendingOpens: 10,
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}
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agent, err := New(cfg, nil)
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if err != nil {
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t.Fatalf("unable to create agent: %v", err)
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}
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// To ensure the heuristic doesn't block on quitting the agent, we'll
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// use the agent's quit chan to signal when it should also stop.
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heuristic.quit = agent.quit
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// With the autopilot agent and all its dependencies we'll start the
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// primary controller goroutine.
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if err := agent.Start(); err != nil {
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t.Fatalf("unable to start agent: %v", err)
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}
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defer agent.Stop()
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// We'll send an initial "yes" response to advance the agent past its
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// initial check. This will cause it to try to get directives from an
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// empty graph.
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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select {
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case heuristic.moreChansResps <- moreChansResp{
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needMore: true,
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numMore: 2,
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amt: walletBalance,
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}:
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case <-time.After(time.Second * 10):
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t.Fatalf("heuristic wasn't queried in time")
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}
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}()
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wg.Wait()
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// Send over an empty list of attachment directives, which should cause
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// the agent to return to waiting on a new signal.
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select {
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case heuristic.directiveResps <- []AttachmentDirective{}:
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case <-time.After(time.Second * 10):
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t.Fatalf("Select was not called but should have been")
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}
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// Simulate more nodes being added to the graph by informing the agent
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// that we have node updates.
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agent.OnNodeUpdates()
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// In response, the agent should wake up and see if it needs more
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// channels. Since we haven't done anything, we will send the same
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// response as before since we are still trying to open channels.
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var wg2 sync.WaitGroup
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wg2.Add(1)
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go func() {
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defer wg2.Done()
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select {
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case heuristic.moreChansResps <- moreChansResp{
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needMore: true,
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numMore: 2,
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amt: walletBalance,
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}:
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case <-time.After(time.Second * 10):
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t.Fatalf("heuristic wasn't queried in time")
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}
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}()
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wg2.Wait()
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// Again the agent should pull in the next set of attachment directives.
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// It's not important that this list is also empty, so long as the node
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// updates signal is causing the agent to make this attempt.
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select {
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case heuristic.directiveResps <- []AttachmentDirective{}:
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case <-time.After(time.Second * 10):
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t.Fatalf("Select was not called but should have been")
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}
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}
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