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package statesync
import (
"math/rand"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/internal/test/factory"
"github.com/tendermint/tendermint/types"
)
var (
startHeight int64 = 200
stopHeight int64 = 100
stopTime = time.Date(2019, 1, 1, 1, 0, 0, 0, time.UTC)
endTime = stopTime.Add(-1 * time.Second)
numWorkers = 1
)
func TestBlockQueueBasic(t *testing.T) {
peerID, err := types.NewNodeID("0011223344556677889900112233445566778899")
require.NoError(t, err)
queue := newBlockQueue(startHeight, stopHeight, stopTime, 1)
wg := &sync.WaitGroup{}
// asynchronously fetch blocks and add it to the queue
for i := 0; i <= numWorkers; i++ {
wg.Add(1)
go func() {
for {
select {
case height := <-queue.nextHeight():
queue.add(mockLBResp(t, peerID, height, endTime))
case <-queue.done():
wg.Done()
return
}
}
}()
}
trackingHeight := startHeight
wg.Add(1)
loop:
for {
select {
case <-queue.done():
wg.Done()
break loop
case resp := <-queue.verifyNext():
// assert that the queue serializes the blocks
require.Equal(t, resp.block.Height, trackingHeight)
trackingHeight--
queue.success(resp.block.Height)
}
}
wg.Wait()
assert.Less(t, trackingHeight, stopHeight)
}
// Test with spurious failures and retries
func TestBlockQueueWithFailures(t *testing.T) {
peerID, err := types.NewNodeID("0011223344556677889900112233445566778899")
require.NoError(t, err)
queue := newBlockQueue(startHeight, stopHeight, stopTime, 200)
wg := &sync.WaitGroup{}
failureRate := 4
for i := 0; i <= numWorkers; i++ {
wg.Add(1)
go func() {
for {
select {
case height := <-queue.nextHeight():
if rand.Intn(failureRate) == 0 {
queue.retry(height)
} else {
queue.add(mockLBResp(t, peerID, height, endTime))
}
case <-queue.done():
wg.Done()
return
}
}
}()
}
trackingHeight := startHeight
for {
select {
case resp := <-queue.verifyNext():
// assert that the queue serializes the blocks
assert.Equal(t, resp.block.Height, trackingHeight)
if rand.Intn(failureRate) == 0 {
queue.retry(resp.block.Height)
} else {
trackingHeight--
queue.success(resp.block.Height)
}
case <-queue.done():
wg.Wait()
assert.Less(t, trackingHeight, stopHeight)
return
}
}
}
// Test that when all the blocks are retrieved that the queue still holds on to
// it's workers and in the event of failure can still fetch the failed block
func TestBlockQueueBlocks(t *testing.T) {
peerID, err := types.NewNodeID("0011223344556677889900112233445566778899")
require.NoError(t, err)
queue := newBlockQueue(startHeight, stopHeight, stopTime, 2)
expectedHeight := startHeight
retryHeight := stopHeight + 2
loop:
for {
select {
case height := <-queue.nextHeight():
require.Equal(t, height, expectedHeight)
require.GreaterOrEqual(t, height, stopHeight)
expectedHeight--
queue.add(mockLBResp(t, peerID, height, endTime))
case <-time.After(1 * time.Second):
if expectedHeight >= stopHeight {
t.Fatalf("expected next height %d", expectedHeight)
}
break loop
}
}
// close any waiter channels that the previous worker left hanging
for _, ch := range queue.waiters {
close(ch)
}
queue.waiters = make([]chan int64, 0)
wg := &sync.WaitGroup{}
wg.Add(1)
// so far so good. The worker is waiting. Now we fail a previous
// block and check that the worker fetches them
go func(t *testing.T) {
defer wg.Done()
select {
case height := <-queue.nextHeight():
require.Equal(t, retryHeight, height)
case <-time.After(1 * time.Second):
require.Fail(t, "queue didn't ask worker to fetch failed height")
}
}(t)
queue.retry(retryHeight)
wg.Wait()
}
func TestBlockQueueAcceptsNoMoreBlocks(t *testing.T) {
peerID, err := types.NewNodeID("0011223344556677889900112233445566778899")
require.NoError(t, err)
queue := newBlockQueue(startHeight, stopHeight, stopTime, 1)
defer queue.close()
loop:
for {
select {
case height := <-queue.nextHeight():
require.GreaterOrEqual(t, height, stopHeight)
queue.add(mockLBResp(t, peerID, height, endTime))
case <-time.After(1 * time.Second):
break loop
}
}
require.Len(t, queue.pending, int(startHeight-stopHeight)+1)
queue.add(mockLBResp(t, peerID, stopHeight-1, endTime))
require.Len(t, queue.pending, int(startHeight-stopHeight)+1)
}
// Test a scenario where more blocks are needed then just the stopheight because
// we haven't found a block with a small enough time.
func TestBlockQueueStopTime(t *testing.T) {
peerID, err := types.NewNodeID("0011223344556677889900112233445566778899")
require.NoError(t, err)
queue := newBlockQueue(startHeight, stopHeight, stopTime, 1)
wg := &sync.WaitGroup{}
baseTime := stopTime.Add(-50 * time.Second)
// asynchronously fetch blocks and add it to the queue
for i := 0; i <= numWorkers; i++ {
wg.Add(1)
go func() {
for {
select {
case height := <-queue.nextHeight():
blockTime := baseTime.Add(time.Duration(height) * time.Second)
queue.add(mockLBResp(t, peerID, height, blockTime))
case <-queue.done():
wg.Done()
return
}
}
}()
}
trackingHeight := startHeight
for {
select {
case resp := <-queue.verifyNext():
// assert that the queue serializes the blocks
assert.Equal(t, resp.block.Height, trackingHeight)
trackingHeight--
queue.success(resp.block.Height)
case <-queue.done():
wg.Wait()
assert.Less(t, trackingHeight, stopHeight-50)
return
}
}
}
func mockLBResp(t *testing.T, peer types.NodeID, height int64, time time.Time) lightBlockResponse {
return lightBlockResponse{
block: mockLB(t, height, time, factory.MakeBlockID()),
peer: peer,
}
}