Add MaxWorker settings to queues

modules/queue/manager.go

@@ -28,17 +28,28 @@ type Manager struct {
 
 // Description represents a working queue inheriting from Gitea.
 type Description struct {
-	mutex           sync.Mutex
-	QID             int64
-	Queue           Queue
-	Type            Type
-	Name            string
-	Configuration   interface{}
-	ExemplarType    string
-	addWorkers      func(number int, timeout time.Duration) context.CancelFunc
-	numberOfWorkers func() int
-	counter         int64
-	PoolWorkers     map[int64]*PoolWorkers
+	mutex         sync.Mutex
+	QID           int64
+	Queue         Queue
+	Type          Type
+	Name          string
+	Configuration interface{}
+	ExemplarType  string
+	Pool          PoolManager
+	counter       int64
+	PoolWorkers   map[int64]*PoolWorkers
+}
+
+// PoolManager is a simple interface to get certain details from a worker pool
+type PoolManager interface {
+	AddWorkers(number int, timeout time.Duration) context.CancelFunc
+	NumberOfWorkers() int
+	MaxNumberOfWorkers() int
+	SetMaxNumberOfWorkers(int)
+	BoostTimeout() time.Duration
+	BlockTimeout() time.Duration
+	BoostWorkers() int
+	SetSettings(maxNumberOfWorkers, boostWorkers int, timeout time.Duration)
 }
 
 // DescriptionList implements the sort.Interface
@@ -76,18 +87,16 @@ func (m *Manager) Add(queue Queue,
 	t Type,
 	configuration,
 	exemplar interface{},
-	addWorkers func(number int, timeout time.Duration) context.CancelFunc,
-	numberOfWorkers func() int) int64 {
+	pool PoolManager) int64 {
 
 	cfg, _ := json.Marshal(configuration)
 	desc := &Description{
-		Queue:           queue,
-		Type:            t,
-		Configuration:   string(cfg),
-		ExemplarType:    reflect.TypeOf(exemplar).String(),
-		PoolWorkers:     make(map[int64]*PoolWorkers),
-		addWorkers:      addWorkers,
-		numberOfWorkers: numberOfWorkers,
+		Queue:         queue,
+		Type:          t,
+		Configuration: string(cfg),
+		ExemplarType:  reflect.TypeOf(exemplar).String(),
+		PoolWorkers:   make(map[int64]*PoolWorkers),
+		Pool:          pool,
 	}
 	m.mutex.Lock()
 	m.counter++
@@ -177,20 +186,61 @@ func (q *Description) RemoveWorkers(pid int64) {
 }
 
 // AddWorkers adds workers to the queue if it has registered an add worker function
-func (q *Description) AddWorkers(number int, timeout time.Duration) {
-	if q.addWorkers != nil {
-		_ = q.addWorkers(number, timeout)
+func (q *Description) AddWorkers(number int, timeout time.Duration) context.CancelFunc {
+	if q.Pool != nil {
+		// the cancel will be added to the pool workers description above
+		return q.Pool.AddWorkers(number, timeout)
 	}
+	return nil
 }
 
 // NumberOfWorkers returns the number of workers in the queue
 func (q *Description) NumberOfWorkers() int {
-	if q.numberOfWorkers != nil {
-		return q.numberOfWorkers()
+	if q.Pool != nil {
+		return q.Pool.NumberOfWorkers()
+	}
+	return -1
+}
+
+// MaxNumberOfWorkers returns the maximum number of workers for the pool
+func (q *Description) MaxNumberOfWorkers() int {
+	if q.Pool != nil {
+		return q.Pool.MaxNumberOfWorkers()
+	}
+	return 0
+}
+
+// BoostWorkers returns the number of workers for a boost
+func (q *Description) BoostWorkers() int {
+	if q.Pool != nil {
+		return q.Pool.BoostWorkers()
 	}
 	return -1
 }
 
+// BoostTimeout returns the timeout of the next boost
+func (q *Description) BoostTimeout() time.Duration {
+	if q.Pool != nil {
+		return q.Pool.BoostTimeout()
+	}
+	return 0
+}
+
+// BlockTimeout returns the timeout til the next boost
+func (q *Description) BlockTimeout() time.Duration {
+	if q.Pool != nil {
+		return q.Pool.BlockTimeout()
+	}
+	return 0
+}
+
+// SetSettings sets the setable boost values
+func (q *Description) SetSettings(maxNumberOfWorkers, boostWorkers int, timeout time.Duration) {
+	if q.Pool != nil {
+		q.Pool.SetSettings(maxNumberOfWorkers, boostWorkers, timeout)
+	}
+}
+
 func (l DescriptionList) Len() int {
 	return len(l)
 }

modules/queue/queue_channel.go

@@ -21,6 +21,7 @@ type ChannelQueueConfiguration struct {
 	QueueLength  int
 	BatchLength  int
 	Workers      int
+	MaxWorkers   int
 	BlockTimeout time.Duration
 	BoostTimeout time.Duration
 	BoostWorkers int
@@ -50,20 +51,21 @@ func NewChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, erro
 	ctx, cancel := context.WithCancel(context.Background())
 	queue := &ChannelQueue{
 		pool: &WorkerPool{
-			baseCtx:      ctx,
-			cancel:       cancel,
-			batchLength:  config.BatchLength,
-			handle:       handle,
-			dataChan:     dataChan,
-			blockTimeout: config.BlockTimeout,
-			boostTimeout: config.BoostTimeout,
-			boostWorkers: config.BoostWorkers,
+			baseCtx:            ctx,
+			cancel:             cancel,
+			batchLength:        config.BatchLength,
+			handle:             handle,
+			dataChan:           dataChan,
+			blockTimeout:       config.BlockTimeout,
+			boostTimeout:       config.BoostTimeout,
+			boostWorkers:       config.BoostWorkers,
+			maxNumberOfWorkers: config.MaxWorkers,
 		},
 		exemplar: exemplar,
 		workers:  config.Workers,
 		name:     config.Name,
 	}
-	queue.pool.qid = GetManager().Add(queue, ChannelQueueType, config, exemplar, queue.pool.AddWorkers, queue.pool.NumberOfWorkers)
+	queue.pool.qid = GetManager().Add(queue, ChannelQueueType, config, exemplar, queue.pool)
 	return queue, nil
 }
 

modules/queue/queue_channel_test.go

@@ -27,6 +27,7 @@ func TestChannelQueue(t *testing.T) {
 		ChannelQueueConfiguration{
 			QueueLength:  20,
 			Workers:      1,
+			MaxWorkers:   10,
 			BlockTimeout: 1 * time.Second,
 			BoostTimeout: 5 * time.Minute,
 			BoostWorkers: 5,
@@ -62,6 +63,7 @@ func TestChannelQueue_Batch(t *testing.T) {
 			QueueLength:  20,
 			BatchLength:  2,
 			Workers:      1,
+			MaxWorkers:   10,
 			BlockTimeout: 1 * time.Second,
 			BoostTimeout: 5 * time.Minute,
 			BoostWorkers: 5,

modules/queue/queue_disk.go

@@ -25,6 +25,7 @@ type LevelQueueConfiguration struct {
 	QueueLength  int
 	BatchLength  int
 	Workers      int
+	MaxWorkers   int
 	BlockTimeout time.Duration
 	BoostTimeout time.Duration
 	BoostWorkers int
@@ -60,14 +61,15 @@ func NewLevelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error)
 
 	queue := &LevelQueue{
 		pool: &WorkerPool{
-			baseCtx:      ctx,
-			cancel:       cancel,
-			batchLength:  config.BatchLength,
-			handle:       handle,
-			dataChan:     dataChan,
-			blockTimeout: config.BlockTimeout,
-			boostTimeout: config.BoostTimeout,
-			boostWorkers: config.BoostWorkers,
+			baseCtx:            ctx,
+			cancel:             cancel,
+			batchLength:        config.BatchLength,
+			handle:             handle,
+			dataChan:           dataChan,
+			blockTimeout:       config.BlockTimeout,
+			boostTimeout:       config.BoostTimeout,
+			boostWorkers:       config.BoostWorkers,
+			maxNumberOfWorkers: config.MaxWorkers,
 		},
 		queue:      internal,
 		exemplar:   exemplar,
@@ -76,7 +78,7 @@ func NewLevelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error)
 		workers:    config.Workers,
 		name:       config.Name,
 	}
-	queue.pool.qid = GetManager().Add(queue, LevelQueueType, config, exemplar, queue.pool.AddWorkers, queue.pool.NumberOfWorkers)
+	queue.pool.qid = GetManager().Add(queue, LevelQueueType, config, exemplar, queue.pool)
 	return queue, nil
 }
 

modules/queue/queue_disk_channel.go

@@ -23,6 +23,7 @@ type PersistableChannelQueueConfiguration struct {
 	Timeout      time.Duration
 	MaxAttempts  int
 	Workers      int
+	MaxWorkers   int
 	BlockTimeout time.Duration
 	BoostTimeout time.Duration
 	BoostWorkers int
@@ -48,6 +49,7 @@ func NewPersistableChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (
 		QueueLength:  config.QueueLength,
 		BatchLength:  config.BatchLength,
 		Workers:      config.Workers,
+		MaxWorkers:   config.MaxWorkers,
 		BlockTimeout: config.BlockTimeout,
 		BoostTimeout: config.BoostTimeout,
 		BoostWorkers: config.BoostWorkers,
@@ -63,6 +65,7 @@ func NewPersistableChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (
 		QueueLength:  config.QueueLength,
 		BatchLength:  config.BatchLength,
 		Workers:      1,
+		MaxWorkers:   6,
 		BlockTimeout: 1 * time.Second,
 		BoostTimeout: 5 * time.Minute,
 		BoostWorkers: 5,
@@ -96,7 +99,7 @@ func NewPersistableChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (
 		},
 		closed: make(chan struct{}),
 	}
-	_ = GetManager().Add(queue, PersistableChannelQueueType, config, exemplar, nil, nil)
+	_ = GetManager().Add(queue, PersistableChannelQueueType, config, exemplar, nil)
 	return queue, nil
 }
 

modules/queue/queue_disk_channel_test.go

@@ -36,6 +36,7 @@ func TestPersistableChannelQueue(t *testing.T) {
 		BatchLength: 2,
 		QueueLength: 20,
 		Workers:     1,
+		MaxWorkers:  10,
 	}, &testData{})
 	assert.NoError(t, err)
 
@@ -89,6 +90,7 @@ func TestPersistableChannelQueue(t *testing.T) {
 		BatchLength: 2,
 		QueueLength: 20,
 		Workers:     1,
+		MaxWorkers:  10,
 	}, &testData{})
 	assert.NoError(t, err)
 

modules/queue/queue_disk_test.go

@@ -35,6 +35,7 @@ func TestLevelQueue(t *testing.T) {
 		DataDir:      tmpDir,
 		BatchLength:  2,
 		Workers:      1,
+		MaxWorkers:   10,
 		QueueLength:  20,
 		BlockTimeout: 1 * time.Second,
 		BoostTimeout: 5 * time.Minute,
@@ -94,6 +95,7 @@ func TestLevelQueue(t *testing.T) {
 				DataDir:      tmpDir,
 				BatchLength:  2,
 				Workers:      1,
+				MaxWorkers:   10,
 				QueueLength:  20,
 				BlockTimeout: 1 * time.Second,
 				BoostTimeout: 5 * time.Minute,

modules/queue/queue_redis.go

@@ -49,6 +49,7 @@ type RedisQueueConfiguration struct {
 	QueueLength  int
 	QueueName    string
 	Workers      int
+	MaxWorkers   int
 	BlockTimeout time.Duration
 	BoostTimeout time.Duration
 	BoostWorkers int
@@ -70,14 +71,15 @@ func NewRedisQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error)
 
 	var queue = &RedisQueue{
 		pool: &WorkerPool{
-			baseCtx:      ctx,
-			cancel:       cancel,
-			batchLength:  config.BatchLength,
-			handle:       handle,
-			dataChan:     dataChan,
-			blockTimeout: config.BlockTimeout,
-			boostTimeout: config.BoostTimeout,
-			boostWorkers: config.BoostWorkers,
+			baseCtx:            ctx,
+			cancel:             cancel,
+			batchLength:        config.BatchLength,
+			handle:             handle,
+			dataChan:           dataChan,
+			blockTimeout:       config.BlockTimeout,
+			boostTimeout:       config.BoostTimeout,
+			boostWorkers:       config.BoostWorkers,
+			maxNumberOfWorkers: config.MaxWorkers,
 		},
 		queueName: config.QueueName,
 		exemplar:  exemplar,
@@ -102,7 +104,7 @@ func NewRedisQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error)
 	if err := queue.client.Ping().Err(); err != nil {
 		return nil, err
 	}
-	queue.pool.qid = GetManager().Add(queue, RedisQueueType, config, exemplar, queue.pool.AddWorkers, queue.pool.NumberOfWorkers)
+	queue.pool.qid = GetManager().Add(queue, RedisQueueType, config, exemplar, queue.pool)
 
 	return queue, nil
 }

modules/queue/queue_wrapped.go

@@ -123,7 +123,7 @@ func NewWrappedQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, erro
 			name:        config.Name,
 		},
 	}
-	_ = GetManager().Add(queue, WrappedQueueType, config, exemplar, nil, nil)
+	_ = GetManager().Add(queue, WrappedQueueType, config, exemplar, nil)
 	return queue, nil
 }
 

modules/queue/workerpool.go

@@ -14,24 +14,25 @@ import (
 
 // WorkerPool takes
 type WorkerPool struct {
-	lock            sync.Mutex
-	baseCtx         context.Context
-	cancel          context.CancelFunc
-	cond            *sync.Cond
-	qid             int64
-	numberOfWorkers int
-	batchLength     int
-	handle          HandlerFunc
-	dataChan        chan Data
-	blockTimeout    time.Duration
-	boostTimeout    time.Duration
-	boostWorkers    int
+	lock               sync.Mutex
+	baseCtx            context.Context
+	cancel             context.CancelFunc
+	cond               *sync.Cond
+	qid                int64
+	maxNumberOfWorkers int
+	numberOfWorkers    int
+	batchLength        int
+	handle             HandlerFunc
+	dataChan           chan Data
+	blockTimeout       time.Duration
+	boostTimeout       time.Duration
+	boostWorkers       int
 }
 
 // Push pushes the data to the internal channel
 func (p *WorkerPool) Push(data Data) {
 	p.lock.Lock()
-	if p.blockTimeout > 0 && p.boostTimeout > 0 {
+	if p.blockTimeout > 0 && p.boostTimeout > 0 && (p.numberOfWorkers <= p.maxNumberOfWorkers || p.maxNumberOfWorkers < 0) {
 		p.lock.Unlock()
 		p.pushBoost(data)
 	} else {
@@ -63,7 +64,7 @@ func (p *WorkerPool) pushBoost(data Data) {
 			}
 		case <-timer.C:
 			p.lock.Lock()
-			if p.blockTimeout > ourTimeout {
+			if p.blockTimeout > ourTimeout || (p.numberOfWorkers > p.maxNumberOfWorkers && p.maxNumberOfWorkers >= 0) {
 				p.lock.Unlock()
 				p.dataChan <- data
 				return
@@ -71,11 +72,15 @@ func (p *WorkerPool) pushBoost(data Data) {
 			p.blockTimeout *= 2
 			ctx, cancel := context.WithCancel(p.baseCtx)
 			desc := GetManager().GetDescription(p.qid)
+			boost := p.boostWorkers
+			if (boost+p.numberOfWorkers) > p.maxNumberOfWorkers && p.maxNumberOfWorkers >= 0 {
+				boost = p.maxNumberOfWorkers - p.numberOfWorkers
+			}
 			if desc != nil {
-				log.Warn("WorkerPool: %d (for %s) Channel blocked for %v - adding %d temporary workers for %s, block timeout now %v", p.qid, desc.Name, ourTimeout, p.boostWorkers, p.boostTimeout, p.blockTimeout)
+				log.Warn("WorkerPool: %d (for %s) Channel blocked for %v - adding %d temporary workers for %s, block timeout now %v", p.qid, desc.Name, ourTimeout, boost, p.boostTimeout, p.blockTimeout)
 
 				start := time.Now()
-				pid := desc.RegisterWorkers(p.boostWorkers, start, false, start, cancel)
+				pid := desc.RegisterWorkers(boost, start, false, start, cancel)
 				go func() {
 					<-ctx.Done()
 					desc.RemoveWorkers(pid)
@@ -91,7 +96,7 @@ func (p *WorkerPool) pushBoost(data Data) {
 				p.blockTimeout /= 2
 				p.lock.Unlock()
 			}()
-			p.addWorkers(ctx, p.boostWorkers)
+			p.addWorkers(ctx, boost)
 			p.lock.Unlock()
 			p.dataChan <- data
 		}
@@ -105,7 +110,53 @@ func (p *WorkerPool) NumberOfWorkers() int {
 	return p.numberOfWorkers
 }
 
-// AddWorkers adds workers to the pool
+// MaxNumberOfWorkers returns the maximum number of workers automatically added to the pool
+func (p *WorkerPool) MaxNumberOfWorkers() int {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	return p.maxNumberOfWorkers
+}
+
+// BoostWorkers returns the number of workers for a boost
+func (p *WorkerPool) BoostWorkers() int {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	return p.boostWorkers
+}
+
+// BoostTimeout returns the timeout of the next boost
+func (p *WorkerPool) BoostTimeout() time.Duration {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	return p.boostTimeout
+}
+
+// BlockTimeout returns the timeout til the next boost
+func (p *WorkerPool) BlockTimeout() time.Duration {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	return p.blockTimeout
+}
+
+// SetSettings sets the setable boost values
+func (p *WorkerPool) SetSettings(maxNumberOfWorkers, boostWorkers int, timeout time.Duration) {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	p.maxNumberOfWorkers = maxNumberOfWorkers
+	p.boostWorkers = boostWorkers
+	p.boostTimeout = timeout
+}
+
+// SetMaxNumberOfWorkers sets the maximum number of workers automatically added to the pool
+// Changing this number will not change the number of current workers but will change the limit
+// for future additions
+func (p *WorkerPool) SetMaxNumberOfWorkers(newMax int) {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	p.maxNumberOfWorkers = newMax
+}
+
+// AddWorkers adds workers to the pool - this allows the number of workers to go above the limit
 func (p *WorkerPool) AddWorkers(number int, timeout time.Duration) context.CancelFunc {
 	var ctx context.Context
 	var cancel context.CancelFunc

modules/setting/queue.go

@@ -31,6 +31,7 @@ type queueSettings struct {
 	MaxAttempts      int
 	Timeout          time.Duration
 	Workers          int
+	MaxWorkers       int
 	BlockTimeout     time.Duration
 	BoostTimeout     time.Duration
 	BoostWorkers     int
@@ -53,6 +54,7 @@ func CreateQueue(name string, handle queue.HandlerFunc, exemplar interface{}) qu
 	opts["DBIndex"] = q.DBIndex
 	opts["QueueName"] = q.QueueName
 	opts["Workers"] = q.Workers
+	opts["MaxWorkers"] = q.MaxWorkers
 	opts["BlockTimeout"] = q.BlockTimeout
 	opts["BoostTimeout"] = q.BoostTimeout
 	opts["BoostWorkers"] = q.BoostWorkers
@@ -108,6 +110,7 @@ func getQueueSettings(name string) queueSettings {
 	q.MaxAttempts = sec.Key("MAX_ATTEMPTS").MustInt(Queue.MaxAttempts)
 	q.Timeout = sec.Key("TIMEOUT").MustDuration(Queue.Timeout)
 	q.Workers = sec.Key("WORKERS").MustInt(Queue.Workers)
+	q.MaxWorkers = sec.Key("MAX_WORKERS").MustInt(Queue.MaxWorkers)
 	q.BlockTimeout = sec.Key("BLOCK_TIMEOUT").MustDuration(Queue.BlockTimeout)
 	q.BoostTimeout = sec.Key("BOOST_TIMEOUT").MustDuration(Queue.BoostTimeout)
 	q.BoostWorkers = sec.Key("BOOST_WORKERS").MustInt(Queue.BoostWorkers)
@@ -135,6 +138,7 @@ func NewQueueService() {
 	Queue.MaxAttempts = sec.Key("MAX_ATTEMPTS").MustInt(10)
 	Queue.Timeout = sec.Key("TIMEOUT").MustDuration(GracefulHammerTime + 30*time.Second)
 	Queue.Workers = sec.Key("WORKERS").MustInt(1)
+	Queue.MaxWorkers = sec.Key("MAX_WORKERS").MustInt(10)
 	Queue.BlockTimeout = sec.Key("BLOCK_TIMEOUT").MustDuration(1 * time.Second)
 	Queue.BoostTimeout = sec.Key("BOOST_TIMEOUT").MustDuration(5 * time.Minute)
 	Queue.BoostWorkers = sec.Key("BOOST_WORKERS").MustInt(5)

options/locale/locale_en-US.ini

@@ -1408,7 +1408,7 @@ settings.protect_check_status_contexts_list = Status checks found in the last we
 settings.protect_required_approvals = Required approvals:
 settings.protect_required_approvals_desc = Allow only to merge pull request with enough positive reviews.
 settings.protect_approvals_whitelist_enabled = Restrict approvals to whitelisted users or teams
-settings.protect_approvals_whitelist_enabled_desc = Only reviews from whitelisted users or teams will count to the required approvals. Without approval whitelist, reviews from anyone with write access count to the required approvals. 
+settings.protect_approvals_whitelist_enabled_desc = Only reviews from whitelisted users or teams will count to the required approvals. Without approval whitelist, reviews from anyone with write access count to the required approvals.
 settings.protect_approvals_whitelist_users = Whitelisted reviewers:
 settings.protect_approvals_whitelist_teams = Whitelisted teams for reviews:
 settings.add_protected_branch = Enable protection
@@ -2028,6 +2028,7 @@ monitor.queue.name = Name
 monitor.queue.type = Type
 monitor.queue.exemplar = Exemplar Type
 monitor.queue.numberworkers = Number of Workers
+monitor.queue.maxnumberworkers = Max Number of Workers
 monitor.queue.review = Review Config
 monitor.queue.review_add = Review/Add Workers
 monitor.queue.configuration = Initial Configuration
@@ -2043,7 +2044,26 @@ monitor.queue.pool.addworkers.numberworkers.placeholder = Number of Workers
 monitor.queue.pool.addworkers.timeout.placeholder = Set to 0 for no timeout
 monitor.queue.pool.addworkers.mustnumbergreaterzero = Number of Workers to add must be greater than zero
 monitor.queue.pool.addworkers.musttimeoutduration = Timeout must be a golang duration eg. 5m or be 0
+
+monitor.queue.settings.title = Pool Settings
+monitor.queue.settings.desc = Pools dynamically grow with a boost in response to their worker queue blocking. These changes will not affect current worker groups.
+monitor.queue.settings.timeout = Boost Timeout
+monitor.queue.settings.timeout.placeholder = Currently %[1]v
+monitor.queue.settings.timeout.error = Timeout must be a golang duration eg. 5m or be 0
+monitor.queue.settings.numberworkers = Boost Number of Workers
+monitor.queue.settings.numberworkers.placeholder = Currently %[1]d
+monitor.queue.settings.numberworkers.error = Number of Workers to add must be greater than or equal to zero
+monitor.queue.settings.maxnumberworkers = Max Number of workers
+monitor.queue.settings.maxnumberworkers.placeholder = Currently %[1]d
+monitor.queue.settings.maxnumberworkers.error = Max number of workers must be a number
+monitor.queue.settings.submit = Change Settings
+monitor.queue.settings.changed = Settings Updated
+monitor.queue.settings.blocktimeout = Current Block Timeout
+monitor.queue.settings.blocktimeout.value = %[1]v
+
+monitor.queue.pool.none = This queue does not have a Pool
 monitor.queue.pool.added = Worker Group Added
+monitor.queue.pool.max_changed = Maximum number of workers changed
 monitor.queue.pool.workers.title = Active Worker Groups
 monitor.queue.pool.workers.none = No worker groups.
 monitor.queue.pool.cancel = Shutdown Worker Group

routers/admin/admin.go

@@ -11,6 +11,7 @@ import (
 	"net/url"
 	"os"
 	"runtime"
+	"strconv"
 	"strings"
 	"time"
 
@@ -421,7 +422,74 @@ func AddWorkers(ctx *context.Context) {
 		ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
 		return
 	}
+	if desc.Pool == nil {
+		ctx.Flash.Error(ctx.Tr("admin.monitor.queue.pool.none"))
+		ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+		return
+	}
 	desc.AddWorkers(number, timeout)
 	ctx.Flash.Success(ctx.Tr("admin.monitor.queue.pool.added"))
 	ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
 }
+
+// SetQueueSettings sets the maximum number of workers for this queue
+func SetQueueSettings(ctx *context.Context) {
+	qid := ctx.ParamsInt64("qid")
+	desc := queue.GetManager().GetDescription(qid)
+	if desc == nil {
+		ctx.Status(404)
+		return
+	}
+	if desc.Pool == nil {
+		ctx.Flash.Error(ctx.Tr("admin.monitor.queue.pool.none"))
+		ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+		return
+	}
+
+	maxNumberStr := ctx.Query("max-number")
+	numberStr := ctx.Query("number")
+	timeoutStr := ctx.Query("timeout")
+
+	var err error
+	var maxNumber, number int
+	var timeout time.Duration
+	if len(maxNumberStr) > 0 {
+		maxNumber, err = strconv.Atoi(maxNumberStr)
+		if err != nil {
+			ctx.Flash.Error(ctx.Tr("admin.monitor.queue.settings.maxnumberworkers.error"))
+			ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+			return
+		}
+		if maxNumber < -1 {
+			maxNumber = -1
+		}
+	} else {
+		maxNumber = desc.MaxNumberOfWorkers()
+	}
+
+	if len(numberStr) > 0 {
+		number, err = strconv.Atoi(numberStr)
+		if err != nil || number < 0 {
+			ctx.Flash.Error(ctx.Tr("admin.monitor.queue.settings.numberworkers.error"))
+			ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+			return
+		}
+	} else {
+		number = desc.BoostWorkers()
+	}
+
+	if len(timeoutStr) > 0 {
+		timeout, err = time.ParseDuration(timeoutStr)
+		if err != nil {
+			ctx.Flash.Error(ctx.Tr("admin.monitor.queue.settings.timeout.error"))
+			ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+			return
+		}
+	} else {
+		timeout = desc.Pool.BoostTimeout()
+	}
+
+	desc.SetSettings(maxNumber, number, timeout)
+	ctx.Flash.Success(ctx.Tr("admin.monitor.queue.settings.changed"))
+	ctx.Redirect(setting.AppSubURL + fmt.Sprintf("/admin/monitor/queue/%d", qid))
+}

routers/routes/routes.go

@@ -416,6 +416,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 			m.Post("/cancel/:pid", admin.MonitorCancel)
 			m.Group("/queue/:qid", func() {
 				m.Get("", admin.Queue)
+				m.Post("/set", admin.SetQueueSettings)
 				m.Post("/add", admin.AddWorkers)
 				m.Post("/cancel/:pid", admin.WorkerCancel)
 			})

templates/admin/queue.tmpl

@@ -14,6 +14,7 @@
 						<th>{{.i18n.Tr "admin.monitor.queue.type"}}</th>
 						<th>{{.i18n.Tr "admin.monitor.queue.exemplar"}}</th>
 						<th>{{.i18n.Tr "admin.monitor.queue.numberworkers"}}</th>
+						<th>{{.i18n.Tr "admin.monitor.queue.maxnumberworkers"}}</th>
 					</tr>
 				</thead>
 				<tbody>
@@ -22,6 +23,7 @@
 						<td>{{.Queue.Type}}</td>
 						<td>{{.Queue.ExemplarType}}</td>
 						<td>{{$sum := .Queue.NumberOfWorkers}}{{if lt $sum 0}}-{{else}}{{$sum}}{{end}}</td>
+						<td>{{if lt $sum 0}}-{{else}}{{.Queue.MaxNumberOfWorkers}}{{end}}</td>
 					</tr>
 				</tbody>
 			</table>
@@ -41,6 +43,34 @@
 		</div>
 		{{else}}
 		<h4 class="ui top attached header">
+			{{.i18n.Tr "admin.monitor.queue.settings.title"}}
+		</h4>
+		<div class="ui attached segment">
+			<p>{{.i18n.Tr "admin.monitor.queue.settings.desc"}}</p>
+			<form method="POST" action="{{.Link}}/set">
+				{{$.CsrfTokenHtml}}
+				<div class="ui form">
+					<div class="inline field">
+						<label for="max-number">{{.i18n.Tr "admin.monitor.queue.settings.maxnumberworkers"}}</label>
+						<input name="max-number" type="text" placeholder="{{.i18n.Tr "admin.monitor.queue.settings.maxnumberworkers.placeholder" .Queue.MaxNumberOfWorkers}}">
+					</div>
+					<div class="inline field">
+						<label for="timeout">{{.i18n.Tr "admin.monitor.queue.settings.timeout"}}</label>
+						<input name="timeout" type="text" placeholder="{{.i18n.Tr "admin.monitor.queue.settings.timeout.placeholder" .Queue.BoostTimeout }}">
+					</div>
+					<div class="inline field">
+						<label for="number">{{.i18n.Tr "admin.monitor.queue.settings.numberworkers"}}</label>
+						<input name="number" type="text" placeholder="{{.i18n.Tr "admin.monitor.queue.settings.numberworkers.placeholder" .Queue.BoostWorkers}}">
+					</div>
+					<div class="inline field">
+						<label>{{.i18n.Tr "admin.monitor.queue.settings.blocktimeout"}}</label>
+						<span>{{.i18n.Tr "admin.monitor.queue.settings.blocktimeout.value" .Queue.BlockTimeout}}</span>
+					</div>
+					<button class="ui submit button">{{.i18n.Tr "admin.monitor.queue.settings.submit"}}</button>
+				</div>
+			</form>
+		</div>
+		<h4 class="ui top attached header">
 			{{.i18n.Tr "admin.monitor.queue.pool.addworkers.title"}}
 		</h4>
 		<div class="ui attached segment">