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service.go
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service.go
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package harvest
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/delving/hub3/ikuzo/domain"
"github.com/go-chi/chi"
"github.com/go-chi/render"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"golang.org/x/sync/errgroup"
)
var _ domain.Service = (*Service)(nil)
type Service struct {
ctx context.Context
cancel context.CancelFunc
group *errgroup.Group
workers int
rw sync.Mutex
defaultDelay int
tasks []*HarvestTask
log zerolog.Logger
orgs domain.OrgConfigRetriever
}
func NewService(options ...Option) (*Service, error) {
s := &Service{
tasks: []*HarvestTask{},
}
// apply options
for _, option := range options {
if err := option(s); err != nil {
return nil, err
}
}
if s.workers == 0 {
s.workers = 1
}
if s.defaultDelay == 0 {
s.defaultDelay = 1
}
return s, nil
}
func (s *Service) AddTask(task ...*HarvestTask) error {
s.rw.Lock()
defer s.rw.Unlock()
if len(task) > 0 {
s.tasks = append(s.tasks, task...)
}
return nil
}
func (s *Service) StartHarvestSync() error {
// create errgroup and add cancel to service
ctx, cancel := context.WithCancel(context.Background())
g, gctx := errgroup.WithContext(ctx)
s.cancel = cancel
s.group = g
s.ctx = ctx
ticker := time.NewTicker(time.Duration(s.defaultDelay) * time.Minute)
for i := 0; i < s.workers; i++ {
g.Go(func() error {
for {
select {
case <-gctx.Done():
return gctx.Err()
case <-ticker.C:
s.rw.Lock()
task := s.findAvailableTask()
if task == nil {
s.rw.Unlock()
continue
}
s.rw.Unlock()
if err := s.runHarvest(gctx, task); err != nil {
return err
}
}
}
})
}
return nil
}
func (s *Service) findAvailableTask() *HarvestTask {
for _, t := range s.tasks {
if t.running {
continue
}
if t.GetLastCheck().Add(t.CheckEvery).Before(time.Now()) {
return t
}
}
return nil
}
func (s *Service) runHarvest(ctx context.Context, task *HarvestTask) error {
g, _ := errgroup.WithContext(ctx)
g.Go(func() error {
defer func() {
if r := recover(); r != nil {
log.Error().
Str("identifier", task.Name).
Err(fmt.Errorf("panic message : %v on url %s", r, task.Request.GetFullURL())).
Msg("unable to run harvest task")
}
}()
err := task.Harvest(ctx)
if err != nil {
return err
}
return nil
})
if err := g.Wait(); errors.Is(err, context.Canceled) {
return err
}
return nil
}
func (s *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
router := chi.NewRouter()
s.Routes("", router)
router.ServeHTTP(w, r)
}
func (s *Service) SetServiceBuilder(b *domain.ServiceBuilder) {
s.log = b.Logger.With().Str("svc", "sitemap").Logger()
s.orgs = b.Orgs
}
// HarvestNow starts all harvest task from the beginning.
func (s *Service) HarvestNow(w http.ResponseWriter, r *http.Request) {
resync := r.URL.Query().Get("resync")
errs := make([]string, 0)
taskNames := make([]string, 0)
for _, task := range s.tasks {
if strings.EqualFold(resync, "true") {
err := task.getOrCreateHarvestInfo()
if err != nil {
errs = append(errs, err.Error())
continue
}
task.HarvestInfo.LastModified = time.Time{}
if err := task.writeHarvestInfo(); err != nil {
errs = append(errs, err.Error())
continue
}
}
err := s.runHarvest(s.ctx, task)
if err != nil {
errs = append(errs, err.Error())
continue
}
taskNames = append(taskNames, task.Name)
}
if len(errs) > 0 {
log.Error().
Err(fmt.Errorf("%s", strings.Join(errs, "\n"))).
Msg("harvest-now could complete properly")
w.WriteHeader(http.StatusInternalServerError)
return
}
render.Status(r, http.StatusAccepted)
msg := fmt.Sprintf("Tasks processed: %s", strings.Join(taskNames, ", "))
render.PlainText(w, r, msg)
}
func (s *Service) Shutdown(ctx context.Context) error {
s.cancel()
if err := s.group.Wait(); err != nil && !errors.Is(err, context.Canceled) {
return err
}
return nil
}