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Properly flush unique queues on startup (go-gitea#23154)
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There have been a number of reports of PRs being blocked whilst being
checked which have been difficult to debug. In investigating go-gitea#23050 I
have realised that whilst the Warn there is somewhat of a miscall there
was a real bug in the way that the LevelUniqueQueue was being restored
on start-up of the PersistableChannelUniqueQueue.

Next there is a conflict in the setting of the internal leveldb queue
name - This wasn't being set so it was being overridden by other unique
queues.

This PR fixes these bugs and adds a testcase.

Thanks to @brechtvl  for noticing the second issue.

Fix go-gitea#23050
and others

---------

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
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@zeripath @techknowlogick @GiteaBot
2 people authored and GiteaBot committed Feb 28, 2023
1 parent ceedb49 commit 836a3a4
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Showing 7 changed files with 332 additions and 21 deletions.
5 changes: 4 additions & 1 deletion modules/queue/queue_channel.go
View file
Expand Up @@ -125,7 +125,10 @@ func (q *ChannelQueue) Shutdown() {
log.Trace("ChannelQueue: %s Flushing", q.name)
// We can't use Cleanup here because that will close the channel
if err := q.FlushWithContext(q.terminateCtx); err != nil {
log.Warn("ChannelQueue: %s Terminated before completed flushing", q.name)
count := atomic.LoadInt64(&q.numInQueue)
if count > 0 {
log.Warn("ChannelQueue: %s Terminated before completed flushing", q.name)
}
return
}
log.Debug("ChannelQueue: %s Flushed", q.name)
Expand Down
29 changes: 22 additions & 7 deletions modules/queue/queue_disk_channel.go
View file
Expand Up @@ -95,7 +95,8 @@ func NewPersistableChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (
},
Workers: 0,
},
DataDir: config.DataDir,
DataDir: config.DataDir,
QueueName: config.Name + "-level",
}

levelQueue, err := NewLevelQueue(wrappedHandle, levelCfg, exemplar)
Expand Down Expand Up @@ -173,16 +174,18 @@ func (q *PersistableChannelQueue) Run(atShutdown, atTerminate func(func())) {
atShutdown(q.Shutdown)
atTerminate(q.Terminate)

if lq, ok := q.internal.(*LevelQueue); ok && lq.byteFIFO.Len(lq.shutdownCtx) != 0 {
if lq, ok := q.internal.(*LevelQueue); ok && lq.byteFIFO.Len(lq.terminateCtx) != 0 {
// Just run the level queue - we shut it down once it's flushed
go q.internal.Run(func(_ func()) {}, func(_ func()) {})
go func() {
for !q.IsEmpty() {
_ = q.internal.Flush(0)
for !lq.IsEmpty() {
_ = lq.Flush(0)
select {
case <-time.After(100 * time.Millisecond):
case <-q.internal.(*LevelQueue).shutdownCtx.Done():
log.Warn("LevelQueue: %s shut down before completely flushed", q.internal.(*LevelQueue).Name())
case <-lq.shutdownCtx.Done():
if lq.byteFIFO.Len(lq.terminateCtx) > 0 {
log.Warn("LevelQueue: %s shut down before completely flushed", q.internal.(*LevelQueue).Name())
}
return
}
}
Expand Down Expand Up @@ -317,10 +320,22 @@ func (q *PersistableChannelQueue) Shutdown() {
// Redirect all remaining data in the chan to the internal channel
log.Trace("PersistableChannelQueue: %s Redirecting remaining data", q.delayedStarter.name)
close(q.channelQueue.dataChan)
countOK, countLost := 0, 0
for data := range q.channelQueue.dataChan {
_ = q.internal.Push(data)
err := q.internal.Push(data)
if err != nil {
log.Error("PersistableChannelQueue: %s Unable redirect %v due to: %v", q.delayedStarter.name, data, err)
countLost++
} else {
countOK++
}
atomic.AddInt64(&q.channelQueue.numInQueue, -1)
}
if countLost > 0 {
log.Warn("PersistableChannelQueue: %s %d will be restored on restart, %d lost", q.delayedStarter.name, countOK, countLost)
} else if countOK > 0 {
log.Warn("PersistableChannelQueue: %s %d will be restored on restart", q.delayedStarter.name, countOK)
}
log.Trace("PersistableChannelQueue: %s Done Redirecting remaining data", q.delayedStarter.name)

log.Debug("PersistableChannelQueue: %s Shutdown", q.delayedStarter.name)
Expand Down
8 changes: 4 additions & 4 deletions modules/queue/queue_disk_channel_test.go
View file
Expand Up @@ -40,7 +40,7 @@ func TestPersistableChannelQueue(t *testing.T) {
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "first",
Name: "test-queue",
}, &testData{})
assert.NoError(t, err)

Expand Down Expand Up @@ -136,7 +136,7 @@ func TestPersistableChannelQueue(t *testing.T) {
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "second",
Name: "test-queue",
}, &testData{})
assert.NoError(t, err)

Expand Down Expand Up @@ -228,7 +228,7 @@ func TestPersistableChannelQueue_Pause(t *testing.T) {
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "first",
Name: "test-queue",
}, &testData{})
assert.NoError(t, err)

Expand Down Expand Up @@ -434,7 +434,7 @@ func TestPersistableChannelQueue_Pause(t *testing.T) {
Workers: 1,
BoostWorkers: 0,
MaxWorkers: 10,
Name: "second",
Name: "test-queue",
}, &testData{})
assert.NoError(t, err)
pausable, ok = queue.(Pausable)
Expand Down
4 changes: 3 additions & 1 deletion modules/queue/unique_queue_channel.go
View file
Expand Up @@ -178,7 +178,9 @@ func (q *ChannelUniqueQueue) Shutdown() {
go func() {
log.Trace("ChannelUniqueQueue: %s Flushing", q.name)
if err := q.FlushWithContext(q.terminateCtx); err != nil {
log.Warn("ChannelUniqueQueue: %s Terminated before completed flushing", q.name)
if !q.IsEmpty() {
log.Warn("ChannelUniqueQueue: %s Terminated before completed flushing", q.name)
}
return
}
log.Debug("ChannelUniqueQueue: %s Flushed", q.name)
Expand Down
7 changes: 7 additions & 0 deletions modules/queue/unique_queue_channel_test.go
View file
Expand Up @@ -9,10 +9,13 @@ import (
"testing"
"time"

"code.gitea.io/gitea/modules/log"

"github.com/stretchr/testify/assert"
)

func TestChannelUniqueQueue(t *testing.T) {
_ = log.NewLogger(1000, "console", "console", `{"level":"warn","stacktracelevel":"NONE","stderr":true}`)
handleChan := make(chan *testData)
handle := func(data ...Data) []Data {
for _, datum := range data {
Expand Down Expand Up @@ -53,6 +56,8 @@ func TestChannelUniqueQueue(t *testing.T) {
}

func TestChannelUniqueQueue_Batch(t *testing.T) {
_ = log.NewLogger(1000, "console", "console", `{"level":"warn","stacktracelevel":"NONE","stderr":true}`)

handleChan := make(chan *testData)
handle := func(data ...Data) []Data {
for _, datum := range data {
Expand Down Expand Up @@ -99,6 +104,8 @@ func TestChannelUniqueQueue_Batch(t *testing.T) {
}

func TestChannelUniqueQueue_Pause(t *testing.T) {
_ = log.NewLogger(1000, "console", "console", `{"level":"warn","stacktracelevel":"NONE","stderr":true}`)

lock := sync.Mutex{}
var queue Queue
var err error
Expand Down
41 changes: 33 additions & 8 deletions modules/queue/unique_queue_disk_channel.go
View file
Expand Up @@ -95,7 +95,8 @@ func NewPersistableChannelUniqueQueue(handle HandlerFunc, cfg, exemplar interfac
},
Workers: 0,
},
DataDir: config.DataDir,
DataDir: config.DataDir,
QueueName: config.Name + "-level",
}

queue.channelQueue = channelUniqueQueue.(*ChannelUniqueQueue)
Expand Down Expand Up @@ -210,17 +211,29 @@ func (q *PersistableChannelUniqueQueue) Run(atShutdown, atTerminate func(func())
atTerminate(q.Terminate)
_ = q.channelQueue.AddWorkers(q.channelQueue.workers, 0)

if luq, ok := q.internal.(*LevelUniqueQueue); ok && luq.ByteFIFOUniqueQueue.byteFIFO.Len(luq.shutdownCtx) != 0 {
if luq, ok := q.internal.(*LevelUniqueQueue); ok && !luq.IsEmpty() {
// Just run the level queue - we shut it down once it's flushed
go q.internal.Run(func(_ func()) {}, func(_ func()) {})
go luq.Run(func(_ func()) {}, func(_ func()) {})
go func() {
_ = q.internal.Flush(0)
log.Debug("LevelUniqueQueue: %s flushed so shutting down", q.internal.(*LevelUniqueQueue).Name())
q.internal.(*LevelUniqueQueue).Shutdown()
GetManager().Remove(q.internal.(*LevelUniqueQueue).qid)
_ = luq.Flush(0)
for !luq.IsEmpty() {
_ = luq.Flush(0)
select {
case <-time.After(100 * time.Millisecond):
case <-luq.shutdownCtx.Done():
if luq.byteFIFO.Len(luq.terminateCtx) > 0 {
log.Warn("LevelUniqueQueue: %s shut down before completely flushed", luq.Name())
}
return
}
}
log.Debug("LevelUniqueQueue: %s flushed so shutting down", luq.Name())
luq.Shutdown()
GetManager().Remove(luq.qid)
}()
} else {
log.Debug("PersistableChannelUniqueQueue: %s Skipping running the empty level queue", q.delayedStarter.name)
_ = q.internal.Flush(0)
q.internal.(*LevelUniqueQueue).Shutdown()
GetManager().Remove(q.internal.(*LevelUniqueQueue).qid)
}
Expand Down Expand Up @@ -286,8 +299,20 @@ func (q *PersistableChannelUniqueQueue) Shutdown() {
// Redirect all remaining data in the chan to the internal channel
close(q.channelQueue.dataChan)
log.Trace("PersistableChannelUniqueQueue: %s Redirecting remaining data", q.delayedStarter.name)
countOK, countLost := 0, 0
for data := range q.channelQueue.dataChan {
_ = q.internal.Push(data)
err := q.internal.(*LevelUniqueQueue).Push(data)
if err != nil {
log.Error("PersistableChannelUniqueQueue: %s Unable redirect %v due to: %v", q.delayedStarter.name, data, err)
countLost++
} else {
countOK++
}
}
if countLost > 0 {
log.Warn("PersistableChannelUniqueQueue: %s %d will be restored on restart, %d lost", q.delayedStarter.name, countOK, countLost)
} else if countOK > 0 {
log.Warn("PersistableChannelUniqueQueue: %s %d will be restored on restart", q.delayedStarter.name, countOK)
}
log.Trace("PersistableChannelUniqueQueue: %s Done Redirecting remaining data", q.delayedStarter.name)

Expand Down

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