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package server
import (	"container/list"	"fmt"	"sync"	"time")
// A Queue for esm build taskstype BuildQueue struct {	lock         sync.RWMutex	list         *list.List	tasks        map[string]*queueTask	processes    []*queueTask	maxProcesses int}
type BuildQueueConsumer struct {	IP string           `json:"ip"`	C  chan BuildOutput `json:"-"`}
type BuildOutput struct {	meta *ESMBuild	err  error}
type queueTask struct {	*BuildTask	inProcess bool	el        *list.Element	createdAt time.Time	startedAt time.Time	consumers []*BuildQueueConsumer}
func (t *queueTask) run() BuildOutput {	c := make(chan BuildOutput, 1)	go func(c chan BuildOutput) {		meta, err := t.Build()		c <- BuildOutput{meta, err}	}(c)
	var output BuildOutput	select {	case output = <-c:		if output.err == nil {			log.Infof("build '%s' done in %v", t.ID(), time.Since(t.startedAt))		} else {			log.Errorf("build '%s': %v", t.ID(), output.err)		}	case <-time.After(10 * time.Minute):		log.Errorf("build '%s': timeout(%v)", t.ID(), time.Since(t.startedAt))		output = BuildOutput{			err: fmt.Errorf("build '%s': timeout(%v)", t.ID(), time.Since(t.startedAt)),		}	}
	return output}
func newBuildQueue(maxProcesses int) *BuildQueue {	q := &BuildQueue{		list:         list.New(),		tasks:        map[string]*queueTask{},		maxProcesses: maxProcesses,	}	return q}
// Len returns the number of tasks of the queue.func (q *BuildQueue) Len() int {	q.lock.RLock()	defer q.lock.RUnlock()
	return q.list.Len()}
// Add adds a new build task.func (q *BuildQueue) Add(task *BuildTask, consumerIp string) *BuildQueueConsumer {	c := &BuildQueueConsumer{consumerIp, make(chan BuildOutput, 1)}	q.lock.Lock()	t, ok := q.tasks[task.ID()]	if ok && consumerIp != "" {		t.consumers = append(t.consumers, c)	}	q.lock.Unlock()
	if ok {		return c	}
	task.stage = "pending"	t = &queueTask{		BuildTask: task,		createdAt: time.Now(),		consumers: []*BuildQueueConsumer{},	}	if consumerIp != "" {		t.consumers = []*BuildQueueConsumer{c}	}	q.lock.Lock()	t.el = q.list.PushBack(t)	q.tasks[task.ID()] = t	q.lock.Unlock()
	q.next()
	return c}
func (q *BuildQueue) RemoveConsumer(task *BuildTask, c *BuildQueueConsumer) {	q.lock.Lock()	defer q.lock.Unlock()
	t, ok := q.tasks[task.ID()]	if ok {		consumers := make([]*BuildQueueConsumer, len(t.consumers))		i := 0		for _, _c := range t.consumers {			if _c != c {				consumers[i] = c				i++			}		}		t.consumers = consumers[0:i]	}}
func (q *BuildQueue) next() {	var nextTask *queueTask	q.lock.Lock()	if len(q.processes) < q.maxProcesses {		for el := q.list.Front(); el != nil; el = el.Next() {			t, ok := el.Value.(*queueTask)			if ok && !t.inProcess {				nextTask = t				break			}		}	}	q.lock.Unlock()
	if nextTask == nil {		return	}
	q.lock.Lock()	nextTask.inProcess = true	q.processes = append(q.processes, nextTask)	q.lock.Unlock()
	go q.wait(nextTask)}
func (q *BuildQueue) wait(t *queueTask) {	t.startedAt = time.Now()
	output := t.run()
	q.lock.Lock()	a := make([]*queueTask, len(q.processes))	i := 0	for _, _t := range q.processes {		if _t != t {			a[i] = _t			i++		}	}	q.processes = a[0:i]	q.list.Remove(t.el)	delete(q.tasks, t.ID())	q.lock.Unlock()
	// call next task	q.next()
	for _, c := range t.consumers {		c.C <- output	}}