lnd.xprv/routing/chainview/interface_test.go

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package chainview
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"testing"
"time"
"github.com/lightninglabs/neutrino"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/chaincfg"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/integration/rpctest"
"github.com/roasbeef/btcd/rpcclient"
"github.com/roasbeef/btcd/txscript"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
"github.com/roasbeef/btcwallet/walletdb"
_ "github.com/roasbeef/btcwallet/walletdb/bdb" // Required to register the boltdb walletdb implementation.
)
var (
netParams = &chaincfg.SimNetParams
testPrivKey = []byte{
0x81, 0xb6, 0x37, 0xd8, 0xfc, 0xd2, 0xc6, 0xda,
0x63, 0x59, 0xe6, 0x96, 0x31, 0x13, 0xa1, 0x17,
0xd, 0xe7, 0x95, 0xe4, 0xb7, 0x25, 0xb8, 0x4d,
0x1e, 0xb, 0x4c, 0xfd, 0x9e, 0xc5, 0x8c, 0xe9,
}
privKey, pubKey = btcec.PrivKeyFromBytes(btcec.S256(), testPrivKey)
addrPk, _ = btcutil.NewAddressPubKey(pubKey.SerializeCompressed(),
netParams)
testAddr = addrPk.AddressPubKeyHash()
testScript, _ = txscript.PayToAddrScript(testAddr)
)
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func getTestTXID(miner *rpctest.Harness) (*chainhash.Hash, error) {
script, err := txscript.PayToAddrScript(testAddr)
if err != nil {
return nil, err
}
outputs := []*wire.TxOut{
{
Value: 2e8,
PkScript: script,
},
}
return miner.SendOutputs(outputs, 10)
}
func locateOutput(tx *wire.MsgTx, script []byte) (*wire.OutPoint, *wire.TxOut, error) {
for i, txOut := range tx.TxOut {
if bytes.Equal(txOut.PkScript, script) {
return &wire.OutPoint{
Hash: tx.TxHash(),
Index: uint32(i),
}, txOut, nil
}
}
return nil, nil, fmt.Errorf("unable to find output")
}
func craftSpendTransaction(outpoint wire.OutPoint, payScript []byte) (*wire.MsgTx, error) {
spendingTx := wire.NewMsgTx(1)
spendingTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: outpoint,
})
spendingTx.AddTxOut(&wire.TxOut{
Value: 1e8,
PkScript: payScript,
})
sigScript, err := txscript.SignatureScript(spendingTx, 0, payScript,
txscript.SigHashAll, privKey, true)
if err != nil {
return nil, err
}
spendingTx.TxIn[0].SignatureScript = sigScript
return spendingTx, nil
}
func assertFilteredBlock(t *testing.T, fb *FilteredBlock, expectedHeight int32,
expectedHash *chainhash.Hash, txns []*chainhash.Hash) {
_, _, line, _ := runtime.Caller(1)
if fb.Height != uint32(expectedHeight) {
t.Fatalf("line %v: block height mismatch: expected %v, got %v",
line, expectedHeight, fb.Height)
}
if !bytes.Equal(fb.Hash[:], expectedHash[:]) {
t.Fatalf("line %v: block hash mismatch: expected %v, got %v",
line, expectedHash, fb.Hash)
}
if len(fb.Transactions) != len(txns) {
t.Fatalf("line %v: expected %v transaction in filtered block, instead "+
"have %v", line, len(txns), len(fb.Transactions))
}
expectedTxids := make(map[chainhash.Hash]struct{})
for _, txn := range txns {
expectedTxids[*txn] = struct{}{}
}
for _, tx := range fb.Transactions {
txid := tx.TxHash()
delete(expectedTxids, txid)
}
if len(expectedTxids) != 0 {
t.Fatalf("line %v: missing txids: %v", line, expectedTxids)
}
}
func testFilterBlockNotifications(node *rpctest.Harness,
chainView FilteredChainView, chainViewInit chainViewInitFunc,
t *testing.T) {
// To start the test, we'll create to fresh outputs paying to the
// private key that we generated above.
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txid1, err := getTestTXID(node)
if err != nil {
t.Fatalf("unable to get test txid")
}
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txid2, err := getTestTXID(node)
if err != nil {
t.Fatalf("unable to get test txid")
}
blockChan := chainView.FilteredBlocks()
// Next we'll mine a block confirming the output generated above.
newBlockHashes, err := node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
_, currentHeight, err := node.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// We should get an update, however it shouldn't yet contain any
// filtered transaction as the filter hasn't been update.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight,
newBlockHashes[0], []*chainhash.Hash{})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
// Now that the block has been mined, we'll fetch the two transactions
// so we can add them to the filter, and also craft transaction
// spending the outputs we created.
tx1, err := node.Node.GetRawTransaction(txid1)
if err != nil {
t.Fatalf("unable to fetch transaction: %v", err)
}
tx2, err := node.Node.GetRawTransaction(txid2)
if err != nil {
t.Fatalf("unable to fetch transaction: %v", err)
}
targetScript, err := txscript.PayToAddrScript(testAddr)
if err != nil {
t.Fatalf("unable to create target output: %v", err)
}
// Next, we'll locate the two outputs generated above that pay to use
// so we can properly add them to the filter.
outPoint1, _, err := locateOutput(tx1.MsgTx(), targetScript)
if err != nil {
t.Fatalf("unable to find output: %v", err)
}
outPoint2, _, err := locateOutput(tx2.MsgTx(), targetScript)
if err != nil {
t.Fatalf("unable to find output: %v", err)
}
_, currentHeight, err = node.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// Now we'll add both output to the current filter.
filter := []wire.OutPoint{*outPoint1, *outPoint2}
err = chainView.UpdateFilter(filter, uint32(currentHeight))
if err != nil {
t.Fatalf("unable to update filter: %v", err)
}
// With the filter updated, we'll now create two transaction spending
// the outputs we created.
spendingTx1, err := craftSpendTransaction(*outPoint1, targetScript)
if err != nil {
t.Fatalf("unable to create spending tx: %v", err)
}
spendingTx2, err := craftSpendTransaction(*outPoint2, targetScript)
if err != nil {
t.Fatalf("unable to create spending tx: %v", err)
}
// Now we'll broadcast the first spending transaction and also mine a
// block which should include it.
spendTxid1, err := node.Node.SendRawTransaction(spendingTx1, true)
if err != nil {
t.Fatalf("unable to broadcast transaction: %v", err)
}
newBlockHashes, err = node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
// We should receive a notification over the channel. The notification
// should correspond to the current block height and have that single
// filtered transaction.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight+1,
newBlockHashes[0], []*chainhash.Hash{spendTxid1})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
// Next, mine the second transaction which spends the second output.
// This should also generate a notification.
spendTxid2, err := node.Node.SendRawTransaction(spendingTx2, true)
if err != nil {
t.Fatalf("unable to broadcast transaction: %v", err)
}
newBlockHashes, err = node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight+2,
newBlockHashes[0], []*chainhash.Hash{spendTxid2})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
}
func testUpdateFilterBackTrack(node *rpctest.Harness,
chainView FilteredChainView, chainViewInit chainViewInitFunc,
t *testing.T) {
// To start, we'll create a fresh output paying to the height generated
// above.
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txid, err := getTestTXID(node)
if err != nil {
t.Fatalf("unable to get test txid")
}
// Next we'll mine a block confirming the output generated above.
initBlockHashes, err := node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
blockChan := chainView.FilteredBlocks()
_, currentHeight, err := node.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// Consume the notification sent which contains an empty filtered
// block.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight,
initBlockHashes[0], []*chainhash.Hash{})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
// Next, create a transaction which spends the output created above,
// mining the spend into a block.
tx, err := node.Node.GetRawTransaction(txid)
if err != nil {
t.Fatalf("unable to fetch transaction: %v", err)
}
outPoint, _, err := locateOutput(tx.MsgTx(), testScript)
if err != nil {
t.Fatalf("unable to find output: %v", err)
}
spendingTx, err := craftSpendTransaction(*outPoint, testScript)
if err != nil {
t.Fatalf("unable to create spending tx: %v", err)
}
spendTxid, err := node.Node.SendRawTransaction(spendingTx, true)
if err != nil {
t.Fatalf("unable to broadcast transaction: %v", err)
}
newBlockHashes, err := node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
// We should've received another empty filtered block notification.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight+1,
newBlockHashes[0], []*chainhash.Hash{})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
// After the block has been mined+notified we'll update the filter with
// a _prior_ height so a "rewind" occurs.
filter := []wire.OutPoint{*outPoint}
err = chainView.UpdateFilter(filter, uint32(currentHeight))
if err != nil {
t.Fatalf("unable to update filter: %v", err)
}
// We should now receive a fresh filtered block notification that
// includes the transaction spend we included above.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight+1,
newBlockHashes[0], []*chainhash.Hash{spendTxid})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
}
func testFilterSingleBlock(node *rpctest.Harness, chainView FilteredChainView,
chainViewInit chainViewInitFunc, t *testing.T) {
// In this test, we'll test the manual filtration of blocks, which can
// be used by clients to manually rescan their sub-set of the UTXO set.
// First, we'll create a block that includes two outputs that we're
// able to spend with the private key generated above.
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txid1, err := getTestTXID(node)
if err != nil {
t.Fatalf("unable to get test txid")
}
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txid2, err := getTestTXID(node)
if err != nil {
t.Fatalf("unable to get test txid")
}
blockChan := chainView.FilteredBlocks()
// Next we'll mine a block confirming the output generated above.
newBlockHashes, err := node.Node.Generate(1)
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
_, currentHeight, err := node.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// We should get an update, however it shouldn't yet contain any
// filtered transaction as the filter hasn't been updated.
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight,
newBlockHashes[0], []*chainhash.Hash{})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
tx1, err := node.Node.GetRawTransaction(txid1)
if err != nil {
t.Fatalf("unable to fetch transaction: %v", err)
}
tx2, err := node.Node.GetRawTransaction(txid2)
if err != nil {
t.Fatalf("unable to fetch transaction: %v", err)
}
// Next, we'll create a block that includes two transactions, each
// which spend one of the outputs created.
outPoint1, _, err := locateOutput(tx1.MsgTx(), testScript)
if err != nil {
t.Fatalf("unable to find output: %v", err)
}
outPoint2, _, err := locateOutput(tx2.MsgTx(), testScript)
if err != nil {
t.Fatalf("unable to find output: %v", err)
}
spendingTx1, err := craftSpendTransaction(*outPoint1, testScript)
if err != nil {
t.Fatalf("unable to create spending tx: %v", err)
}
spendingTx2, err := craftSpendTransaction(*outPoint2, testScript)
if err != nil {
t.Fatalf("unable to create spending tx: %v", err)
}
txns := []*btcutil.Tx{btcutil.NewTx(spendingTx1), btcutil.NewTx(spendingTx2)}
block, err := node.GenerateAndSubmitBlock(txns, 11, time.Time{})
if err != nil {
t.Fatalf("unable to generate block: %v", err)
}
select {
case filteredBlock := <-blockChan:
assertFilteredBlock(t, filteredBlock, currentHeight+1,
block.Hash(), []*chainhash.Hash{})
case <-time.After(time.Second * 20):
t.Fatalf("filtered block notification didn't arrive")
}
_, currentHeight, err = node.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// Now we'll manually trigger filtering the block generated above.
// First, we'll add the two outpoints to our filter.
filter := []wire.OutPoint{*outPoint1, *outPoint2}
err = chainView.UpdateFilter(filter, uint32(currentHeight))
if err != nil {
t.Fatalf("unable to update filter: %v", err)
}
// We set the filter with the current height, so we shouldn't get any
// notifications.
select {
case <-blockChan:
t.Fatalf("got filter notification, but shouldn't have")
default:
}
// Now we'll manually rescan that past block. This should include two
// filtered transactions, the spending transactions we created above.
filteredBlock, err := chainView.FilterBlock(block.Hash())
if err != nil {
t.Fatalf("unable to filter block: %v", err)
}
txn1, txn2 := spendingTx1.TxHash(), spendingTx2.TxHash()
expectedTxns := []*chainhash.Hash{&txn1, &txn2}
assertFilteredBlock(t, filteredBlock, currentHeight, block.Hash(),
expectedTxns)
}
// testFilterBlockDisconnected triggers a reorg all the way back to genesis,
// and a small 5 block reorg, ensuring the chainView notifies about
// disconnected and connected blocks in the order we expect.
func testFilterBlockDisconnected(node *rpctest.Harness,
chainView FilteredChainView, chainViewInit chainViewInitFunc,
t *testing.T) {
// Create a node that has a shorter chain than the main chain, so we
// can trigger a reorg.
reorgNode, err := rpctest.New(netParams, nil, nil)
if err != nil {
t.Fatalf("unable to create mining node: %v", err)
}
defer reorgNode.TearDown()
// This node's chain will be 105 blocks.
if err := reorgNode.SetUp(true, 5); err != nil {
t.Fatalf("unable to set up mining node: %v", err)
}
// Init a chain view that has this node as its block source.
cleanUpFunc, reorgView, err := chainViewInit(reorgNode.RPCConfig(),
reorgNode.P2PAddress())
if err != nil {
t.Fatalf("unable to create chain view: %v", err)
}
defer func() {
if cleanUpFunc != nil {
cleanUpFunc()
}
}()
if err = reorgView.Start(); err != nil {
t.Fatalf("unable to start btcd chain view: %v", err)
}
defer reorgView.Stop()
newBlocks := reorgView.FilteredBlocks()
disconnectedBlocks := reorgView.DisconnectedBlocks()
_, oldHeight, err := reorgNode.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// Now connect the node with the short chain to the main node, and wait
// for their chains to synchronize. The short chain will be reorged all
// the way back to genesis.
if err := rpctest.ConnectNode(reorgNode, node); err != nil {
t.Fatalf("unable to connect harnesses: %v", err)
}
nodeSlice := []*rpctest.Harness{node, reorgNode}
if err := rpctest.JoinNodes(nodeSlice, rpctest.Blocks); err != nil {
t.Fatalf("unable to join node on blocks: %v", err)
}
_, newHeight, err := reorgNode.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// We should be getting oldHeight number of blocks marked as
// stale/disconnected. We expect to first get all stale blocks,
// then the new blocks. We also ensure a strict ordering.
for i := int32(0); i < oldHeight+newHeight; i++ {
select {
case block := <-newBlocks:
if i < oldHeight {
t.Fatalf("did not expect to get new block "+
"in iteration %d", i)
}
expectedHeight := uint32(i - oldHeight + 1)
if block.Height != expectedHeight {
t.Fatalf("expected to receive connected "+
"block at height %d, instead got at %d",
expectedHeight, block.Height)
}
case block := <-disconnectedBlocks:
if i >= oldHeight {
t.Fatalf("did not expect to get stale block "+
"in iteration %d", i)
}
expectedHeight := uint32(oldHeight - i)
if block.Height != expectedHeight {
t.Fatalf("expected to receive disconencted "+
"block at height %d, instead got at %d",
expectedHeight, block.Height)
}
case <-time.After(10 * time.Second):
t.Fatalf("timeout waiting for block")
}
}
// Now we trigger a small reorg, by disconnecting the nodes, mining
// a few blocks on each, then connecting them again.
peers, err := reorgNode.Node.GetPeerInfo()
if err != nil {
t.Fatalf("unable to get peer info: %v", err)
}
numPeers := len(peers)
// Disconnect the nodes.
err = reorgNode.Node.AddNode(node.P2PAddress(), rpcclient.ANRemove)
if err != nil {
t.Fatalf("unable to disconnect mining nodes: %v", err)
}
// Wait for disconnection
for {
peers, err = reorgNode.Node.GetPeerInfo()
if err != nil {
t.Fatalf("unable to get peer info: %v", err)
}
if len(peers) < numPeers {
break
}
time.Sleep(100 * time.Millisecond)
}
// Mine 10 blocks on the main chain, 5 on the chain that will be
// reorged out,
node.Node.Generate(10)
reorgNode.Node.Generate(5)
// 5 new blocks should get notified.
for i := uint32(0); i < 5; i++ {
select {
case block := <-newBlocks:
expectedHeight := uint32(newHeight) + i + 1
if block.Height != expectedHeight {
t.Fatalf("expected to receive connected "+
"block at height %d, instead got at %d",
expectedHeight, block.Height)
}
case <-disconnectedBlocks:
t.Fatalf("did not expect to get stale block "+
"in iteration %d", i)
case <-time.After(10 * time.Second):
t.Fatalf("did not get connected block")
}
}
_, oldHeight, err = reorgNode.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// Now connect the two nodes, and wait for their chains to sync up.
if err := rpctest.ConnectNode(reorgNode, node); err != nil {
t.Fatalf("unable to connect harnesses: %v", err)
}
if err := rpctest.JoinNodes(nodeSlice, rpctest.Blocks); err != nil {
t.Fatalf("unable to join node on blocks: %v", err)
}
_, newHeight, err = reorgNode.Node.GetBestBlock()
if err != nil {
t.Fatalf("unable to get current height: %v", err)
}
// We should get 5 disconnected, 10 connected blocks.
for i := uint32(0); i < 15; i++ {
select {
case block := <-newBlocks:
if i < 5 {
t.Fatalf("did not expect to get new block "+
"in iteration %d", i)
}
// The expected height for the connected block will be
// oldHeight - 5 (the 5 disconnected blocks) + (i-5)
// (subtract 5 since the 5 first iterations consumed
// disconnected blocks) + 1
expectedHeight := uint32(oldHeight) - 9 + i
if block.Height != expectedHeight {
t.Fatalf("expected to receive connected "+
"block at height %d, instead got at %d",
expectedHeight, block.Height)
}
case block := <-disconnectedBlocks:
if i >= 5 {
t.Fatalf("did not expect to get stale block "+
"in iteration %d", i)
}
expectedHeight := uint32(oldHeight) - i
if block.Height != expectedHeight {
t.Fatalf("expected to receive disconnected "+
"block at height %d, instead got at %d",
expectedHeight, block.Height)
}
case <-time.After(10 * time.Second):
t.Fatalf("did not get disconnected block")
}
}
// Time for db access to finish between testcases.
time.Sleep(time.Millisecond * 500)
}
type chainViewInitFunc func(rpcInfo rpcclient.ConnConfig,
p2pAddr string) (func(), FilteredChainView, error)
type testCase struct {
name string
test func(*rpctest.Harness, FilteredChainView, chainViewInitFunc,
*testing.T)
}
var chainViewTests = []testCase{
{
name: "filtered block ntfns",
test: testFilterBlockNotifications,
},
{
name: "update filter back track",
test: testUpdateFilterBackTrack,
},
{
name: "fitler single block",
test: testFilterSingleBlock,
},
{
name: "filter block disconnected",
test: testFilterBlockDisconnected,
},
}
var interfaceImpls = []struct {
name string
chainViewInit chainViewInitFunc
}{
{
name: "p2p_neutrino",
chainViewInit: func(_ rpcclient.ConnConfig, p2pAddr string) (func(), FilteredChainView, error) {
spvDir, err := ioutil.TempDir("", "neutrino")
if err != nil {
return nil, nil, err
}
dbName := filepath.Join(spvDir, "neutrino.db")
spvDatabase, err := walletdb.Create("bdb", dbName)
if err != nil {
return nil, nil, err
}
spvConfig := neutrino.Config{
DataDir: spvDir,
Database: spvDatabase,
ChainParams: *netParams,
ConnectPeers: []string{p2pAddr},
}
neutrino.WaitForMoreCFHeaders = 250 * time.Millisecond
spvNode, err := neutrino.NewChainService(spvConfig)
if err != nil {
return nil, nil, err
}
spvNode.Start()
// Wait until the node has fully synced up to the local
// btcd node.
for !spvNode.IsCurrent() {
time.Sleep(time.Millisecond * 100)
}
cleanUp := func() {
spvDatabase.Close()
spvNode.Stop()
os.RemoveAll(spvDir)
}
chainView, err := NewCfFilteredChainView(spvNode)
if err != nil {
return nil, nil, err
}
return cleanUp, chainView, nil
},
},
{
name: "btcd_websockets",
chainViewInit: func(config rpcclient.ConnConfig, _ string) (func(), FilteredChainView, error) {
chainView, err := NewBtcdFilteredChainView(config)
if err != nil {
return nil, nil, err
}
return nil, chainView, err
},
},
}
func TestFilteredChainView(t *testing.T) {
// Initialize the harness around a btcd node which will serve as our
// dedicated miner to generate blocks, cause re-orgs, etc. We'll set up
// this node with a chain length of 125, so we have plentyyy of BTC to
// play around with.
miner, err := rpctest.New(netParams, nil, nil)
if err != nil {
t.Fatalf("unable to create mining node: %v", err)
}
defer miner.TearDown()
if err := miner.SetUp(true, 25); err != nil {
t.Fatalf("unable to set up mining node: %v", err)
}
rpcConfig := miner.RPCConfig()
p2pAddr := miner.P2PAddress()
for _, chainViewImpl := range interfaceImpls {
t.Logf("Testing '%v' implementation of FilteredChainView",
chainViewImpl.name)
cleanUpFunc, chainView, err := chainViewImpl.chainViewInit(rpcConfig, p2pAddr)
if err != nil {
t.Fatalf("unable to make chain view: %v", err)
}
if err := chainView.Start(); err != nil {
t.Fatalf("unable to start chain view: %v", err)
}
for _, chainViewTest := range chainViewTests {
testName := fmt.Sprintf("%v: %v", chainViewImpl.name,
chainViewTest.name)
success := t.Run(testName, func(t *testing.T) {
chainViewTest.test(miner, chainView,
chainViewImpl.chainViewInit, t)
})
if !success {
break
}
}
if err := chainView.Stop(); err != nil {
t.Fatalf("unable to stop chain view: %v", err)
}
if cleanUpFunc != nil {
cleanUpFunc()
}
}
}