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handler.go
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handler.go
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package job
import (
"encoding/json"
"sync"
"time"
"github.com/kenza-ai/kenza/api/api"
"github.com/kenza-ai/kenza/api/schedule"
"github.com/kenza-ai/kenza/event"
"github.com/kenza-ai/kenza/pubsub"
"github.com/robfig/cron/v3"
)
var (
scheduledMu sync.RWMutex
scheduleCronJobs = map[int64]cron.EntryID{}
)
// ListenAndHandleOnDemandJobs handles on-demand jobs (jobs arriving via a VCS webhook or from the UI directly).
func ListenAndHandleOnDemandJobs(apiClient api.Client, pub, sub *pubsub.RabbitMQ, queue, exchange string, done chan<- error) {
i("Binding queue %s to exchange %s on routing key %s", queue, exchange, event.JobArrivedRoutingKey)
err := sub.Subscribe(queue, event.JobArrivedRoutingKey, 0, func(body []byte, ack func(ok bool, requeue bool)) {
var ok bool
defer func() {
i("Enqueued '%v', requeued: '%v'", ok, false)
ack(ok, false)
}()
arrival := event.JobArrived{}
if err := json.Unmarshal(body, &arrival); err != nil {
e("Incoming job request error %s", err)
return
}
i("Received job request %+v", arrival)
jobID, err := apiClient.JobCreate(arrival.AccountID, arrival.ProjectID, arrival.Submitter, arrival.DeliveryID, arrival.CommitID)
if err != nil {
e(err.Error())
return
}
i(`Created job "%d" in project "%d" in account "%d"`, jobID, arrival.ProjectID, arrival.AccountID)
queuedEvt := event.JobQueued{JobID: jobID, JobInfo: arrival}
if err := pub.Publish(queuedEvt, event.JobQueuedRoutingKey); err != nil {
e("Failed to enqueue job '%s'", err)
return
}
ok = true
i("Enqueued job for processing %+v", queuedEvt)
})
if err != nil {
e("Jobs subscriber error: ", err)
}
i("Job arrivals subscriber stopping")
done <- err
}
// ListenAndHandleScheduledJobs handles scheduled jobs (jobs starting from a cron job).
// It regularly polls for schedules to detect which ones have not yet been submitted and
// submits cron jobs for those schedules that have not yet been setup to run.
func ListenAndHandleScheduledJobs(apiClient api.Client, pub *pubsub.RabbitMQ, c *cron.Cron) {
c.Start()
ticker := time.NewTicker(time.Second * 60)
defer ticker.Stop()
// For each not already submitted schedule, start a cron job that
// will create and submit a Kenza job for processing to the workers.
for range ticker.C {
scheduledMu.RLock()
submittedSchedules := make([]int64, len(scheduleCronJobs))
for cronJobEntryID := range scheduleCronJobs {
submittedSchedules = append(submittedSchedules, cronJobEntryID)
}
scheduledMu.RUnlock()
schedules, err := apiClient.Schedules(submittedSchedules)
if err != nil {
e("error retrieving schedules: %s", err.Error())
continue
}
count := 0
for _, sch := range schedules {
i("Retrieved schedule %d", sch.ID)
cronEntryID, err := c.AddFunc(sch.Cron, func() { setupScheduledJob(apiClient, pub, sch) })
if err != nil {
e("Cron error: %s", err)
continue
}
count++
scheduledMu.Lock()
scheduleCronJobs[sch.ID] = cronEntryID
scheduledMu.Unlock()
i("Submitted schedule %d with cron id %d", sch.ID, cronEntryID)
}
i("Added cron for %d new schedule(s)", count)
}
}
func setupScheduledJob(apiClient api.Client, pub *pubsub.RabbitMQ, sch schedule.Schedule) {
i("Running cron for schedule: %+v", sch)
// Create job
jobID, err := apiClient.JobCreate(sch.AccountID, sch.ProjectID, sch.Title, "DELIVERY-ID TODO", "")
if err != nil {
e(err.Error())
return
}
i(`Created job "%d" in project "%d" in account "%d"`, jobID, sch.ProjectID, sch.AccountID)
// Submit job to worker queue
evt := event.JobQueued{
JobID: jobID,
JobInfo: event.JobInfo{
AccountID: sch.AccountID,
ProjectID: sch.ProjectID,
CloneURL: sch.Repository,
Ref: sch.Ref,
CommitID: "", // (HEAD or the commit a tag is referring to)
},
}
if err := pub.Publish(evt, event.JobQueuedRoutingKey); err != nil {
e("Failed to enqueue job '%s'", err)
return // TODO(ilazakis): attempt to save job or drop in a DLX
}
i("Enqueued job %d", jobID)
}
// ListenAndHandleSchedules handles changes to schedules arriving from job workers (via changes to .kenza.yml)
func ListenAndHandleSchedules(apiClient api.Client, sub *pubsub.RabbitMQ, schedulesQueue, exchange string, done chan<- error, c *cron.Cron) {
i("Binding queue %s to exchange %s on routing key %s", schedulesQueue, exchange, event.SchedulesReceivedRoutingKey)
err := sub.Subscribe(schedulesQueue, event.SchedulesReceivedRoutingKey, 0, func(body []byte, ack func(ok bool, requeue bool)) {
var ok bool
defer func() {
i("Enqueued '%v', requeued: '%v'", ok, false)
ack(ok, false)
}()
incomingSchedulesEvent := &event.SchedulesReceived{}
if err := json.Unmarshal(body, incomingSchedulesEvent); err != nil {
e("Incoming schedules request error %s", err)
return
}
i("Received schedules event for account %d project %d, number of schedules %d",
incomingSchedulesEvent.AccountID,
incomingSchedulesEvent.ProjectID,
len(*incomingSchedulesEvent.Schedules))
incomingSchedules := incomingSchedulesEvent.Schedules
existingSchedules, err := apiClient.SchedulesForProject(incomingSchedulesEvent.AccountID, incomingSchedulesEvent.ProjectID)
if err != nil {
e("error retrieving schedules %s", err.Error())
return
}
i("retrieved schedules %+v", existingSchedules)
handleSchedules(apiClient, existingSchedules, *incomingSchedules, incomingSchedulesEvent.AccountID, incomingSchedulesEvent.ProjectID, c)
ok = true
})
if err != nil {
e("Schedules subscriber error: ", err)
}
i("Schedules subscriber stopping")
done <- err
}
// 1. Deletes schedules not in `incoming` schedules
// 2. Updates schedules present in both `existing` and `incoming` schedules
// 3. Creates schedules only present in `incoming` schedules
func handleSchedules(apiClient api.Client, existingSchedules []schedule.Schedule, incomingSchedules event.Schedules, accountID, projectID int64, c *cron.Cron) {
existingSchedulesTitles := map[string]struct{}{}
for _, schedule := range existingSchedules {
existingSchedulesTitles[schedule.Title] = struct{}{}
_, ok := incomingSchedules[schedule.Title]
if !ok {
err := apiClient.ScheduleDelete(accountID, projectID, schedule.ID)
if err != nil {
e(err.Error())
continue
}
i("Schedule deleted %d", schedule.ID)
scheduledMu.RLock()
cronForRemoval, ok := scheduleCronJobs[schedule.ID]
if !ok {
continue
}
scheduledMu.Unlock()
c.Remove(cronForRemoval)
}
}
for incomingScheduleTitle, scheduleEntry := range incomingSchedules {
_, alreadyExisted := existingSchedulesTitles[incomingScheduleTitle]
ref := "refs/heads/" + scheduleEntry.Branch
if scheduleEntry.Tag != "" {
ref = "refs/tags/" + scheduleEntry.Tag
}
var err error
var schID int64
if alreadyExisted {
err = apiClient.ScheduleUpdate(schedule.Schedule{
AccountID: accountID,
ProjectID: projectID,
Ref: ref,
Cron: scheduleEntry.When,
Title: incomingScheduleTitle,
Description: scheduleEntry.Description,
})
if err != nil {
e("error updating schedule: %s", err.Error())
continue
}
scheduledMu.Lock()
cronForRemoval, ok := scheduleCronJobs[schID]
if !ok {
scheduledMu.Unlock()
continue
}
c.Remove(cronForRemoval)
delete(scheduleCronJobs, schID)
scheduledMu.Unlock()
} else {
schID, err = apiClient.ScheduleCreate(schedule.Schedule{
AccountID: accountID,
ProjectID: projectID,
Ref: ref,
Cron: scheduleEntry.When,
Title: incomingScheduleTitle,
Description: scheduleEntry.Description,
})
if err != nil {
e("error creating schedule: %s", err.Error())
continue
}
}
if alreadyExisted {
i("Updated schedule %d and removed pending scheduled jobs for updates to be taken into account next time cron runs", schID)
} else {
i("Created schedule %d", schID)
}
}
}