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sharer.go
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sharer.go
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package social
import (
"fmt"
"gnd.la/app"
"gnd.la/log"
"gnd.la/tasks"
"time"
)
const (
pollInterval = 5 * time.Minute
)
type Sharer struct {
// Name indicates the name of the gnd.la/tasks.Task which will
// be created when scheduling this Sharer. If empty, a name
// will be derived from the service and the Sharer instance.
Name string
service Service
interval time.Duration
provider ShareProvider
config interface{}
task *tasks.Task
}
func (s *Sharer) share(ctx *app.Context) {
last, err := s.provider.LastShare(ctx, s.service)
if err != nil {
log.Errorf("error finding last share time on %s: %s", s.service, err)
return
}
if last.Before(time.Now().Add(-s.interval)) {
item, err := s.provider.Item(ctx, s.service)
if err != nil {
log.Errorf("error finding next time for sharing on %s: %s", s.service, err)
return
}
if item != nil {
result, err := Share(ctx, s.service, item, s.config)
if err != nil {
log.Errorf("error sharing on %s: %s", s.service, err)
}
s.provider.Shared(ctx, s.service, item, result, err)
}
}
}
func (s *Sharer) Schedule(a *app.App, interval time.Duration) {
if s.task != nil {
s.task.Stop()
}
s.interval = interval
name := s.Name
if name == "" {
name = fmt.Sprintf("Sharer.%s.%p", s.service, s)
}
options := &tasks.Options{Name: name}
s.task = tasks.Schedule(a, s.share, options, pollInterval, true)
}
func (s *Sharer) Stop() {
if s.task != nil {
s.task.Stop()
s.task = nil
}
}
func NewSharer(s Service, provider ShareProvider, config interface{}) *Sharer {
if provider == nil {
panic(fmt.Errorf("provider can't be nil"))
}
if err := validateConfig(s, config); err != nil {
panic(err)
}
return &Sharer{
service: s,
provider: provider,
config: config,
}
}