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package blogtrigger
import (
"fmt"
"log/slog"
"github.com/SayaAndy/saya-today-web/config"
"github.com/SayaAndy/saya-today-web/internal/b2"
"github.com/go-co-op/gocron/v2"
)
type BlogTriggerScheduler struct {
s gocron.Scheduler
knownBlogPages map[string]map[string]*b2.BlogPage
b2Client *b2.B2Client
onTrigger func([]*b2.BlogPage) error
}
func NewBlogTriggerScheduler(b2Client *b2.B2Client, availableLanguages []config.AvailableLanguageConfig, cron string, onTrigger func([]*b2.BlogPage) error) (*BlogTriggerScheduler, error) {
s, err := gocron.NewScheduler()
if err != nil {
return nil, fmt.Errorf("failed to create new scheduler: %w", err)
}
knownBlogPages := make(map[string]map[string]*b2.BlogPage, len(availableLanguages))
for _, lang := range availableLanguages {
knownBlogPages[lang.Name] = make(map[string]*b2.BlogPage)
}
bts := &BlogTriggerScheduler{s, knownBlogPages, b2Client, onTrigger}
defer bts.s.Start()
bts.s.NewJob(gocron.CronJob(cron, false), gocron.NewTask(func(bts *BlogTriggerScheduler) {
posts, err := bts.scan()
if err != nil {
slog.Error("failed to execute scanning new blog pages cron job", slog.String("error", err.Error()))
return
}
if err = onTrigger(posts); err != nil {
slog.Error("error happened on callback function after scanning new blog pages", slog.String("error", err.Error()))
return
}
}, bts))
if _, err = bts.scan(); err != nil {
return nil, fmt.Errorf("failed to scan existing blog pages in b2: %w", err)
}
return bts, nil
}
func (bts *BlogTriggerScheduler) Close() error {
return bts.s.Shutdown()
}
func (bts *BlogTriggerScheduler) scan() (newPages []*b2.BlogPage, err error) {
newPages = make([]*b2.BlogPage, 0)
for lang := range bts.knownBlogPages {
posts, err := bts.b2Client.Scan(lang + "/")
if err != nil {
return nil, fmt.Errorf("failed to scan blog pages in b2 on '%s': %w", lang, err)
}
for _, post := range posts {
if _, ok := bts.knownBlogPages[lang][post.FileName]; !ok {
post.Lang = lang
newPages = append(newPages, post)
bts.knownBlogPages[lang][post.FileName] = post
}
}
}
return newPages, nil
}
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