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Fix agent polling (#3378)

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Anbraten 2024-02-16 10:04:13 +01:00 committed by GitHub
parent bfff8dbc6f
commit 0e0d0188a0
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5 changed files with 85 additions and 33 deletions
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6
server/api/agent.go
View file

@ -137,6 +137,9 @@ func PatchAgent(c *gin.Context) {
}
agent.Name = in.Name
agent.NoSchedule = in.NoSchedule
if agent.NoSchedule {
server.Config.Services.Queue.KickAgentWorkers(agent.ID)
}
err = _store.AgentUpdate(agent)
if err != nil {
@ -214,6 +217,9 @@ func DeleteAgent(c *gin.Context) {
}
}
// kick workers to remove the agent from the queue
server.Config.Services.Queue.KickAgentWorkers(agent.ID)
if err = _store.AgentDelete(agent); err != nil {
c.String(http.StatusInternalServerError, "Error deleting user. %s", err)
return

28
server/grpc/rpc.go
View file

@ -56,20 +56,23 @@ func (s *RPC) Next(c context.Context, agentFilter rpc.Filter) (*rpc.Workflow, er
log.Debug().Msgf("agent connected: %s: polling", hostname)
}
fn := createFilterFunc(agentFilter)
for {
agent, err := s.getAgentFromContext(c)
if err != nil {
return nil, err
} else if agent.NoSchedule {
return nil, nil
}
filterFn := createFilterFunc(agentFilter)
task, err := s.queue.Poll(c, agent.ID, fn)
if err != nil {
agent, err := s.getAgentFromContext(c)
if err != nil {
return nil, err
}
if agent.NoSchedule {
time.Sleep(1 * time.Second)
return nil, nil
}
for {
// poll blocks until a task is available or the context is canceled / worker is kicked
task, err := s.queue.Poll(c, agent.ID, filterFn)
if err != nil || task == nil {
return nil, err
} else if task == nil {
return nil, nil
}
if task.ShouldRun() {
@ -78,6 +81,7 @@ func (s *RPC) Next(c context.Context, agentFilter rpc.Filter) (*rpc.Workflow, er
return workflow, err
}
// task should not run, so mark it as done
if err := s.Done(c, task.ID, rpc.State{}); err != nil {
log.Error().Err(err).Msgf("mark task '%s' done failed", task.ID)
}

43
server/queue/fifo.go
View file

@ -17,6 +17,7 @@ package queue
import (
"container/list"
"context"
"fmt"
"sync"
"time"
@ -36,6 +37,7 @@ type worker struct {
agentID int64
filter FilterFn
channel chan *model.Task
stop context.CancelCauseFunc
}
type fifo struct {
@ -61,7 +63,7 @@ func New(_ context.Context) Queue {
}
}
// Push pushes an item to the tail of this queue.
// Push pushes a task to the tail of this queue.
func (q *fifo) Push(_ context.Context, task *model.Task) error {
q.Lock()
q.pending.PushBack(task)
@ -70,7 +72,7 @@ func (q *fifo) Push(_ context.Context, task *model.Task) error {
return nil
}
// Push pushes an item to the tail of this queue.
// PushAtOnce pushes multiple tasks to the tail of this queue.
func (q *fifo) PushAtOnce(_ context.Context, tasks []*model.Task) error {
q.Lock()
for _, task := range tasks {
@ -81,13 +83,16 @@ func (q *fifo) PushAtOnce(_ context.Context, tasks []*model.Task) error {
return nil
}
// Poll retrieves and removes the head of this queue.
// Poll retrieves and removes a task head of this queue.
func (q *fifo) Poll(c context.Context, agentID int64, f FilterFn) (*model.Task, error) {
q.Lock()
ctx, stop := context.WithCancelCause(c)
w := &worker{
agentID: agentID,
channel: make(chan *model.Task, 1),
filter: f,
stop: stop,
}
q.workers[w] = struct{}{}
q.Unlock()
@ -95,30 +100,30 @@ func (q *fifo) Poll(c context.Context, agentID int64, f FilterFn) (*model.Task,
for {
select {
case <-c.Done():
case <-ctx.Done():
q.Lock()
delete(q.workers, w)
q.Unlock()
return nil, nil
return nil, ctx.Err()
case t := <-w.channel:
return t, nil
}
}
}
// Done signals that the item is done executing.
// Done signals the task is complete.
func (q *fifo) Done(_ context.Context, id string, exitStatus model.StatusValue) error {
return q.finished([]string{id}, exitStatus, nil)
}
// Error signals that the item is done executing with error.
// Error signals the task is done with an error.
func (q *fifo) Error(_ context.Context, id string, err error) error {
return q.finished([]string{id}, model.StatusFailure, err)
}
// ErrorAtOnce signals that the item is done executing with error.
func (q *fifo) ErrorAtOnce(_ context.Context, id []string, err error) error {
return q.finished(id, model.StatusFailure, err)
// ErrorAtOnce signals multiple done are complete with an error.
func (q *fifo) ErrorAtOnce(_ context.Context, ids []string, err error) error {
return q.finished(ids, model.StatusFailure, err)
}
func (q *fifo) finished(ids []string, exitStatus model.StatusValue, err error) error {
@ -145,7 +150,7 @@ func (q *fifo) Evict(c context.Context, id string) error {
return q.EvictAtOnce(c, []string{id})
}
// Evict removes a pending task from the queue.
// EvictAtOnce removes multiple pending tasks from the queue.
func (q *fifo) EvictAtOnce(_ context.Context, ids []string) error {
q.Lock()
defer q.Unlock()
@ -200,7 +205,6 @@ func (q *fifo) Info(_ context.Context) InfoT {
stats.Stats.Pending = q.pending.Len()
stats.Stats.WaitingOnDeps = q.waitingOnDeps.Len()
stats.Stats.Running = len(q.running)
stats.Stats.Complete = 0 // TODO: implement this
for e := q.pending.Front(); e != nil; e = e.Next() {
task, _ := e.Value.(*model.Task)
@ -219,12 +223,14 @@ func (q *fifo) Info(_ context.Context) InfoT {
return stats
}
// Pause stops the queue from handing out new work items in Poll
func (q *fifo) Pause() {
q.Lock()
q.paused = true
q.Unlock()
}
// Resume starts the queue again.
func (q *fifo) Resume() {
q.Lock()
q.paused = false
@ -232,6 +238,19 @@ func (q *fifo) Resume() {
go q.process()
}
// KickAgentWorkers kicks all workers for a given agent.
func (q *fifo) KickAgentWorkers(agentID int64) {
q.Lock()
defer q.Unlock()
for w := range q.workers {
if w.agentID == agentID {
w.stop(fmt.Errorf("worker was kicked"))
delete(q.workers, w)
}
}
}
// helper function that loops through the queue and attempts to
// match the item to a single subscriber.
func (q *fifo) process() {

23
server/queue/persistent.go
View file

@ -95,7 +95,7 @@ func (q *persistentQueue) Evict(c context.Context, id string) error {
return err
}
// EvictAtOnce removes a pending task from the queue.
// EvictAtOnce removes multiple pending tasks from the queue.
func (q *persistentQueue) EvictAtOnce(c context.Context, ids []string) error {
if err := q.Queue.EvictAtOnce(c, ids); err != nil {
return err
@ -107,3 +107,24 @@ func (q *persistentQueue) EvictAtOnce(c context.Context, ids []string) error {
}
return nil
}
// Error signals the task is done with an error.
func (q *persistentQueue) Error(c context.Context, id string, err error) error {
if err := q.Queue.Error(c, id, err); err != nil {
return err
}
return q.store.TaskDelete(id)
}
// ErrorAtOnce signals multiple tasks are done with an error.
func (q *persistentQueue) ErrorAtOnce(c context.Context, ids []string, err error) error {
if err := q.Queue.ErrorAtOnce(c, ids, err); err != nil {
return err
}
for _, id := range ids {
if err := q.store.TaskDelete(id); err != nil {
return err
}
}
return nil
}

18
server/queue/queue.go
View file

@ -40,7 +40,6 @@ type InfoT struct {
Pending int `json:"pending_count"`
WaitingOnDeps int `json:"waiting_on_deps_count"`
Running int `json:"running_count"`
Complete int `json:"completed_count"`
} `json:"stats"`
Paused bool `json:"paused"`
} // @name InfoT
@ -73,7 +72,7 @@ type Queue interface {
// Push pushes a task to the tail of this queue.
Push(c context.Context, task *model.Task) error
// PushAtOnce pushes a task to the tail of this queue.
// PushAtOnce pushes multiple tasks to the tail of this queue.
PushAtOnce(c context.Context, tasks []*model.Task) error
// Poll retrieves and removes a task head of this queue.
@ -85,17 +84,17 @@ type Queue interface {
// Done signals the task is complete.
Done(c context.Context, id string, exitStatus model.StatusValue) error
// Error signals the task is complete with errors.
// Error signals the task is done with an error.
Error(c context.Context, id string, err error) error
// ErrorAtOnce signals the task is complete with errors.
ErrorAtOnce(c context.Context, id []string, err error) error
// ErrorAtOnce signals multiple done are complete with an error.
ErrorAtOnce(c context.Context, ids []string, err error) error
// Evict removes a pending task from the queue.
Evict(c context.Context, id string) error
// EvictAtOnce removes a pending task from the queue.
EvictAtOnce(c context.Context, id []string) error
// EvictAtOnce removes multiple pending tasks from the queue.
EvictAtOnce(c context.Context, ids []string) error
// Wait waits until the task is complete.
Wait(c context.Context, id string) error
@ -106,6 +105,9 @@ type Queue interface {
// Pause stops the queue from handing out new work items in Poll
Pause()
// Resume starts the queue again, Poll returns new items
// Resume starts the queue again.
Resume()
// KickAgentWorkers kicks all workers for a given agent.
KickAgentWorkers(agentID int64)
}