itest: test that the fed envoy reattempts mint proof push syncs

This commit adds an integration test which helps to ensure that a
minting node will retry pushing a minting proof to a federation server
peer node, in the event that that peer node failed to receive the proof
at the time of the initial sync attempt.

itest/test_list_on_test.go

@@ -203,6 +203,10 @@ var testCases = []*testCase{
 		name: "universe pagination simple",
 		test: testUniversePaginationSimple,
 	},
+	{
+		name: "mint proof repeat fed sync attempt",
+		test: testMintProofRepeatFedSyncAttempt,
+	},
 }
 
 var optionalTestCases = []*testCase{

itest/universe_federation_test.go

@@ -0,0 +1,98 @@
+package itest
+
+import (
+	"context"
+	"time"
+
+	"github.com/lightninglabs/taproot-assets/taprpc/mintrpc"
+	unirpc "github.com/lightninglabs/taproot-assets/taprpc/universerpc"
+	"github.com/stretchr/testify/require"
+)
+
+// testMintProofRepeatFedSyncAttempt tests that the minting node will retry
+// pushing the minting proofs to the federation server peer node, if the peer
+// node is offline at the time of the initial sync attempt.
+func testMintProofRepeatFedSyncAttempt(t *harnessTest) {
+	// Create a new minting node, without hooking it up to any existing
+	// Universe server. We will also set the sync ticker to 4 second, so
+	// that we can test that the proof push sync is retried and eventually
+	// succeeds after the fed server peer node reappears online.
+	syncTickerInterval := 4 * time.Second
+	mintingNode := setupTapdHarness(
+		t.t, t, t.lndHarness.Bob, nil,
+		func(params *tapdHarnessParams) {
+			params.fedSyncTickerInterval = &syncTickerInterval
+		},
+	)
+	defer func() {
+		require.NoError(t.t, mintingNode.stop(!*noDelete))
+	}()
+
+	// We'll use the main node as our federation universe server
+	// counterparty.
+	fedServerNode := t.tapd
+
+	// Keep a reference to the fed server node RPC host address, so that we
+	// can assert that it has not changed after the restart. This is
+	// important, because the minting node will be retrying the proof push
+	// to this address.
+	fedServerNodeRpcHost := fedServerNode.rpcHost()
+
+	// Register the fedServerNode as a federation universe server with the
+	// minting node.
+	ctxb := context.Background()
+	ctxt, cancel := context.WithTimeout(ctxb, defaultWaitTimeout)
+	defer cancel()
+
+	_, err := mintingNode.AddFederationServer(
+		ctxt, &unirpc.AddFederationServerRequest{
+			Servers: []*unirpc.UniverseFederationServer{
+				{
+					Host: fedServerNodeRpcHost,
+				},
+			},
+		},
+	)
+	require.NoError(t.t, err)
+
+	// Assert that the fed server node has not seen any asset proofs.
+	AssertUniverseStats(t.t, fedServerNode, 0, 0, 0)
+
+	// Stop the federation server peer node, so that it does not receive the
+	// newly minted asset proofs immediately upon minting.
+	t.Logf("Stopping fed server tapd node")
+	require.NoError(t.t, fedServerNode.stop(*noDelete))
+
+	// Now that federation peer node is inactive, we'll mint some assets.
+	t.Logf("Minting assets on minting node")
+	rpcAssets := MintAssetsConfirmBatch(
+		t.t, t.lndHarness.Miner.Client, mintingNode,
+		[]*mintrpc.MintAssetRequest{
+			simpleAssets[0], issuableAssets[0],
+		},
+	)
+	require.Len(t.t, rpcAssets, 2)
+
+	t.lndHarness.MineBlocks(7)
+
+	// Wait for the minting node to attempt (and fail) to push the minting
+	// proofs to the fed peer node. We wait some multiple of the sync ticker
+	// interval to ensure that the minting node has had time to retry the
+	// proof push sync.
+	time.Sleep(syncTickerInterval * 2)
+
+	// Start the federation server peer node. The federation envoy component
+	// of our minting node should currently be retrying the proof push sync
+	// with the federation peer at each tick.
+	t.Logf("Start (previously stopped) fed server tapd node")
+	err = fedServerNode.start(false)
+	require.NoError(t.t, err)
+
+	// Ensure that the federation server node RPC host address has not
+	// changed after the restart. If it has, then the minting node will be
+	// retrying the proof push to the wrong address.
+	require.Equal(t.t, fedServerNodeRpcHost, fedServerNode.rpcHost())
+
+	t.Logf("Assert that fed peer node has seen the asset minting proofs")
+	AssertUniverseStats(t.t, fedServerNode, 2, 2, 1)
+}