itest+lntest: migrate lntemp to lntest

This commit performs the takeover that `lntemp` is now promoted to be
`lntest`, and the scaffolding is now removed as all the refactoring is
finished!

lntest/harness_setup.go

@@ -0,0 +1,120 @@
+package lntest
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/btcsuite/btcd/integration/rpctest"
+	"github.com/lightningnetwork/lnd/lntest/node"
+	"github.com/stretchr/testify/require"
+)
+
+// SetupHarness creates a new HarnessTest with a series of setups such that the
+// instance is ready for usage. The setups are,
+// 1. create the directories to hold lnd files.
+// 2. start a btcd miner.
+// 3. start a chain backend(btcd, bitcoind, or neutrino).
+// 4. connect the miner and the chain backend.
+// 5. start the HarnessTest.
+func SetupHarness(t *testing.T, binaryPath, dbBackendName string,
+	feeService WebFeeService) *HarnessTest {
+
+	t.Log("Setting up HarnessTest...")
+
+	// Parse testing flags that influence our test execution.
+	logDir := node.GetLogDir()
+	require.NoError(t, os.MkdirAll(logDir, 0700), "create log dir failed")
+
+	// Parse database backend
+	dbBackend := prepareDbBackend(t, dbBackendName)
+
+	// Create a new HarnessTest.
+	ht := NewHarnessTest(t, binaryPath, feeService, dbBackend)
+
+	// Init the miner.
+	t.Log("Prepare the miner and mine blocks to activate segwit...")
+	miner := prepareMiner(ht.runCtx, ht.T)
+
+	// Start a chain backend.
+	chainBackend, cleanUp := prepareChainBackend(t, miner.P2PAddress())
+	ht.stopChainBackend = cleanUp
+
+	// Connect our chainBackend to our miner.
+	t.Log("Connecting the miner with the chain backend...")
+	require.NoError(t, chainBackend.ConnectMiner(), "connect miner")
+
+	// Start the HarnessTest with the chainBackend and miner.
+	ht.Start(chainBackend, miner)
+
+	return ht
+}
+
+// prepareMiner creates an instance of the btcd's rpctest.Harness that will act
+// as the miner for all tests. This will be used to fund the wallets of the
+// nodes within the test network and to drive blockchain related events within
+// the network. Revert the default setting of accepting non-standard
+// transactions on simnet to reject them. Transactions on the lightning network
+// should always be standard to get better guarantees of getting included in to
+// blocks.
+func prepareMiner(ctxt context.Context, t *testing.T) *HarnessMiner {
+	miner := NewMiner(ctxt, t)
+
+	// Before we start anything, we want to overwrite some of the
+	// connection settings to make the tests more robust. We might need to
+	// restart the miner while there are already blocks present, which will
+	// take a bit longer than the 1 second the default settings amount to.
+	// Doubling both values will give us retries up to 4 seconds.
+	miner.MaxConnRetries = rpctest.DefaultMaxConnectionRetries * 2
+	miner.ConnectionRetryTimeout = rpctest.DefaultConnectionRetryTimeout * 2
+
+	// Set up miner and connect chain backend to it.
+	require.NoError(t, miner.SetUp(true, 50))
+	require.NoError(t, miner.Client.NotifyNewTransactions(false))
+
+	// Next mine enough blocks in order for segwit and the CSV package
+	// soft-fork to activate on SimNet.
+	numBlocks := harnessNetParams.MinerConfirmationWindow * 2
+	miner.GenerateBlocks(numBlocks)
+
+	return miner
+}
+
+// prepareChainBackend creates a new chain backend.
+func prepareChainBackend(t *testing.T,
+	minerAddr string) (node.BackendConfig, func()) {
+
+	chainBackend, cleanUp, err := NewBackend(
+		minerAddr, harnessNetParams,
+	)
+	require.NoError(t, err, "new backend")
+
+	return chainBackend, func() {
+		require.NoError(t, cleanUp(), "cleanup")
+	}
+}
+
+// prepareDbBackend parses a DatabaseBackend based on the name given.
+func prepareDbBackend(t *testing.T,
+	dbBackendName string) node.DatabaseBackend {
+
+	var dbBackend node.DatabaseBackend
+	switch dbBackendName {
+	case "bbolt":
+		dbBackend = node.BackendBbolt
+
+	case "etcd":
+		dbBackend = node.BackendEtcd
+
+	case "postgres":
+		dbBackend = node.BackendPostgres
+
+	case "sqlite":
+		dbBackend = node.BackendSqlite
+
+	default:
+		require.Fail(t, "unknown db backend")
+	}
+
+	return dbBackend
+}