/
main.go
162 lines (141 loc) · 4.3 KB
/
main.go
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package main
import (
"crypto/md5"
"log"
"strconv"
"strings"
"sync"
"time"
"github.com/go-redis/redis"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api"
"github.com/minhdanh/thangmo/internal/config"
"github.com/minhdanh/thangmo/pkg/bitly"
"github.com/minhdanh/thangmo/pkg/hackernews"
"github.com/minhdanh/thangmo/pkg/telegram"
"github.com/mmcdole/gofeed"
)
type ItemWrapper struct {
Item interface{}
Prefix string
RssLinkCheckSum string
TelegramChannel string
}
func getHNItem(itemsChan chan ItemWrapper, hnClient *hackernews.HNClient, rc *redis.Client, minScore int, itemId int, wg *sync.WaitGroup) {
defer wg.Done()
if checked, err := alreadyChecked(rc, strconv.Itoa(itemId)); err != nil {
log.Println(err)
return
} else if checked {
log.Printf("HackerNews item %v already checked", itemId)
return
}
hnItem, err := hnClient.GetItem(itemId)
if err != nil {
log.Printf("Error getting HackerNews item %v: %v", itemId, err)
return
}
if hnItem.Score >= minScore {
// items = append(items, ItemWrapper{Item: hnItem})
itemsChan <- ItemWrapper{Item: hnItem}
} else {
log.Printf("HackerNews item %v doesn't have enough points (%v)", itemId, hnItem.Score)
}
}
func main() {
config := config.NewConfig()
var items []ItemWrapper
rc := config.RedisClient
if config.HackerNewsConfig.Enabled {
log.Println("Getting top stories from HackerNews")
hnClient := hackernews.NewHNClient()
hnItemIDs := hnClient.GetItemIDs()
itemsChan := make(chan ItemWrapper)
wg := new(sync.WaitGroup)
for _, itemId := range hnItemIDs {
wg.Add(1)
go getHNItem(itemsChan, hnClient, rc, config.HackerNewsConfig.MinScore, itemId, wg)
}
go func() {
wg.Wait()
close(itemsChan)
}()
for item := range itemsChan {
items = append(items, item)
}
}
for _, rssChannel := range config.RSSChannels {
log.Printf("Getting RSS content for %v", rssChannel.Name)
fp := gofeed.NewParser()
feed, err := fp.ParseURL(rssChannel.URL)
if err != nil {
log.Println(err)
// TODO: notify about error such as time out when connecting to bbc
continue
}
log.Printf("RSS channel %v has %v items", rssChannel.Name, len(feed.Items))
for _, item := range feed.Items {
md5Sum := md5.Sum([]byte(strings.TrimSpace(item.Link)))
linkHash := string(md5Sum[:])
if checked, err := alreadyChecked(rc, linkHash); err != nil {
log.Println(err)
continue
} else if checked {
log.Printf("RSS item \"%v\" already checked", item.Title)
continue
}
items = append(items, ItemWrapper{Item: item, Prefix: rssChannel.Name, RssLinkCheckSum: linkHash, TelegramChannel: rssChannel.TelegramChannel})
}
}
log.Printf("Processing %v items", len(items))
t := telegram.NewClient(config.TelegramApiToken, config.TelegramChannel, config.TelegramPreviewLink, config.HackerNewsConfig.YcombinatorLink)
for _, item := range items {
var url, redisKey string
switch value := item.Item.(type) {
case *hackernews.HNItem:
log.Printf("Sending Telegram message, HackerNews item: %v", value.ID)
url = value.URL
redisKey = strconv.Itoa(value.ID)
case *gofeed.Item:
log.Printf("Sending Telegram message, RSS item: \"%v\"", value.Title)
url = strings.TrimSpace(value.Link)
redisKey = item.RssLinkCheckSum
}
if config.BitLyEnabled {
bitly := bitly.NewClient(config.BitLyApiToken)
url = bitly.ShortenUrl(url)
}
if config.DryRun == false {
for i := 0; i < config.RetryCount+1; i++ {
if i > 0 {
log.Println("Retrying message...")
}
_, err := t.SendMessageForItem(item.Item, url, item.Prefix, item.TelegramChannel)
if err != nil {
log.Println(err)
err := err.(tgbotapi.Error)
// wait to retry only if rate limited
if err.Code == 429 {
log.Printf("Rate limited. Waiting for %v seconds before retrying.", err.ResponseParameters.RetryAfter)
time.Sleep(time.Second * time.Duration(err.ResponseParameters.RetryAfter+1))
}
} else {
rc.Set(redisKey, "", 0)
break
}
if config.RetryEnabled == false {
break
}
}
} else {
log.Println("dry-run mode is enabled. Not sending messages.")
}
}
}
func alreadyChecked(rc *redis.Client, key string) (bool, error) {
if _, err := rc.Get(key).Result(); err == redis.Nil {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}