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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net"
"net/http"
"net/url"
"os"
"slices"
"time"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/lrstanley/girc"
"github.com/mmcdole/gofeed"
"golang.org/x/net/proxy"
)
func GetFeed(feed FeedConfig,
client *girc.Client,
pool *pgxpool.Pool,
channel, groupName string,
) {
rowName := groupName + "__" + feed.Name + "__"
parsedFeed, err := feed.FeedParser.ParseURL(feed.URL)
if err != nil {
LogError(err)
} else {
if len(parsedFeed.Items) > 0 {
query := fmt.Sprintf("select newest_unix_time from rss where name = '%s'", rowName)
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
defer cancel()
newestFromDB := int64(0)
err := pool.QueryRow(ctx, query).Scan(&newestFromDB)
if err != nil {
pool.Exec(ctx, fmt.Sprintf("insert into rss (name, newest_unix_time) values ('%s',0)", rowName))
}
sortFunc := func(a, b *gofeed.Item) int {
if a.PublishedParsed.Before(*b.PublishedParsed) {
return -1
} else if a.PublishedParsed.After(*b.PublishedParsed) {
return 1
}
return 0
}
slices.SortFunc(parsedFeed.Items, sortFunc)
for _, item := range parsedFeed.Items {
if item.PublishedParsed.Unix() > newestFromDB {
client.Cmd.Message(channel, parsedFeed.Title+": "+item.Title+">>>"+item.Link)
}
}
query = fmt.Sprintf("update rss set newest_unix_time = %d where name = '%s'", parsedFeed.Items[len(parsedFeed.Items)-1].PublishedParsed.Unix(), rowName)
ctx2, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
defer cancel()
_, err = pool.Exec(ctx2, query)
if err != nil {
LogError(err)
}
}
}
}
func feedDispatcher(
config RSSConfig,
client *girc.Client,
pool *pgxpool.Pool,
channel, groupName string,
period int,
) {
for {
for i := range len(config.Feeds) {
config.Feeds[i].FeedParser = gofeed.NewParser()
config.Feeds[i].FeedParser.UserAgent = config.Feeds[i].UserAgent
if config.Feeds[i].Proxy != "" {
proxyURL, err := url.Parse(config.Feeds[i].Proxy)
if err != nil {
LogError(err)
continue
}
dialer, err := proxy.FromURL(proxyURL, &net.Dialer{Timeout: time.Duration(config.Feeds[i].Timeout) * time.Second})
if err != nil {
LogError(err)
continue
}
httpClient := http.Client{
Transport: &http.Transport{
Dial: dialer.Dial,
},
}
config.Feeds[i].FeedParser.Client = &httpClient
}
}
for _, feed := range config.Feeds {
go GetFeed(feed, client, pool, channel, groupName)
}
time.Sleep(time.Duration(period) * time.Second)
}
}
func ParseRSSConfig(rssConfFilePath string) *RSSConfig {
file, err := os.Open(rssConfFilePath)
if err != nil {
LogError(err)
return nil
}
var config *RSSConfig
decoder := json.NewDecoder(file)
err = decoder.Decode(&config)
if err != nil {
LogError(err)
return nil
}
return config
}
func runRSS(appConfig *TomlConfig, client *girc.Client) {
query := fmt.Sprintf(
`create table if not exists rss (
id serial primary key,
name text not null unique,
newest_unix_time bigint not null
)`)
for {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
defer cancel()
_, err := appConfig.pool.Exec(ctx, query)
if err != nil {
LogError(err)
time.Sleep(time.Duration(60) * time.Second)
} else {
break
}
}
for groupName, rss := range appConfig.Rss {
log.Print("RSS: joining ", rss.Channel)
client.Cmd.Join(rss.Channel)
rssConfig := ParseRSSConfig(rss.RssFile)
if rssConfig == nil {
log.Print("Could not parse RSS config file " + rss.RssFile + ". Exiting.")
} else {
go feedDispatcher(*rssConfig, client, appConfig.pool, rss.Channel, groupName, rssConfig.Period)
}
}
}
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