/
job_scheduler.go
81 lines (62 loc) · 1.61 KB
/
job_scheduler.go
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package service
import (
"fmt"
"github.com/exograd/eventline/pkg/eventline"
"github.com/galdor/go-log"
"github.com/galdor/go-service/pkg/pg"
)
type JobScheduler struct {
Log *log.Logger
Service *Service
}
func NewJobScheduler(s *Service) *JobScheduler {
return &JobScheduler{
Service: s,
}
}
func (js *JobScheduler) Init(w *eventline.Worker) {
js.Log = w.Log
}
func (js *JobScheduler) Start() error {
return nil
}
func (js *JobScheduler) Stop() {
}
func (js *JobScheduler) ProcessJob() (bool, error) {
var processed bool
err := js.Service.Pg.WithTx(func(conn pg.Conn) error {
id1 := PgAdvisoryLockId1
id2 := PgAdvisoryLockId2JobScheduling
if err := pg.TakeAdvisoryTxLock(conn, id1, id2); err != nil {
return fmt.Errorf("cannot take advisory lock: %w", err)
}
if max := js.Service.Cfg.MaxParallelJobExecutions; max > 0 {
globalScope := eventline.NewGlobalScope()
n, err := eventline.CountStartedJobExecutions(conn, globalScope)
if err != nil {
return fmt.Errorf("cannot count job executions: %w", err)
}
if n >= int64(max) {
return nil
}
}
je, err := eventline.LoadJobExecutionForScheduling(conn)
if err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
} else if je == nil {
return nil
}
js.Log.Info("processing job execution %q", je.Id)
scope := eventline.NewProjectScope(je.ProjectId)
if err := js.Service.StartJobExecution(conn, je, scope); err != nil {
return fmt.Errorf("cannot start job execution %q: %w",
je.Id, err)
}
processed = true
return nil
})
if err != nil {
return false, err
}
return processed, nil
}