apollo-backend/internal/worker/subreddits.go

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package worker
import (
"context"
"fmt"
"math/rand"
"os"
"strconv"
"strings"
"time"
"github.com/DataDog/datadog-go/statsd"
"github.com/adjust/rmq/v4"
"github.com/go-redis/redis/v8"
"github.com/jackc/pgx/v4/pgxpool"
"github.com/sideshow/apns2"
"github.com/sideshow/apns2/payload"
"github.com/sideshow/apns2/token"
"github.com/sirupsen/logrus"
"github.com/christianselig/apollo-backend/internal/domain"
"github.com/christianselig/apollo-backend/internal/reddit"
"github.com/christianselig/apollo-backend/internal/repository"
)
type subredditsWorker struct {
logger *logrus.Logger
statsd *statsd.Client
db *pgxpool.Pool
redis *redis.Client
queue rmq.Connection
reddit *reddit.Client
apns *token.Token
consumers int
accountRepo domain.AccountRepository
deviceRepo domain.DeviceRepository
subredditRepo domain.SubredditRepository
watcherRepo domain.WatcherRepository
}
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const (
subredditNotificationTitleFormat = "📣 \u201c%s\u201d Watcher"
subredditNotificationBodyFormat = "r/%s: \u201c%s\u201d"
)
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func NewSubredditsWorker(logger *logrus.Logger, statsd *statsd.Client, db *pgxpool.Pool, redis *redis.Client, queue rmq.Connection, consumers int) Worker {
reddit := reddit.NewClient(
os.Getenv("REDDIT_CLIENT_ID"),
os.Getenv("REDDIT_CLIENT_SECRET"),
statsd,
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redis,
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consumers,
)
var apns *token.Token
{
authKey, err := token.AuthKeyFromFile(os.Getenv("APPLE_KEY_PATH"))
if err != nil {
panic(err)
}
apns = &token.Token{
AuthKey: authKey,
KeyID: os.Getenv("APPLE_KEY_ID"),
TeamID: os.Getenv("APPLE_TEAM_ID"),
}
}
return &subredditsWorker{
logger,
statsd,
db,
redis,
queue,
reddit,
apns,
consumers,
repository.NewPostgresAccount(db),
repository.NewPostgresDevice(db),
repository.NewPostgresSubreddit(db),
repository.NewPostgresWatcher(db),
}
}
func (sw *subredditsWorker) Start() error {
queue, err := sw.queue.OpenQueue("subreddits")
if err != nil {
return err
}
sw.logger.WithFields(logrus.Fields{
"numConsumers": sw.consumers,
}).Info("starting up subreddits worker")
prefetchLimit := int64(sw.consumers * 2)
if err := queue.StartConsuming(prefetchLimit, pollDuration); err != nil {
return err
}
host, _ := os.Hostname()
for i := 0; i < sw.consumers; i++ {
name := fmt.Sprintf("consumer %s-%d", host, i)
consumer := NewSubredditsConsumer(sw, i)
if _, err := queue.AddConsumer(name, consumer); err != nil {
return err
}
}
return nil
}
func (sw *subredditsWorker) Stop() {
<-sw.queue.StopAllConsuming() // wait for all Consume() calls to finish
}
type subredditsConsumer struct {
*subredditsWorker
tag int
apnsSandbox *apns2.Client
apnsProduction *apns2.Client
}
func NewSubredditsConsumer(sw *subredditsWorker, tag int) *subredditsConsumer {
return &subredditsConsumer{
sw,
tag,
apns2.NewTokenClient(sw.apns),
apns2.NewTokenClient(sw.apns).Production(),
}
}
func (sc *subredditsConsumer) Consume(delivery rmq.Delivery) {
ctx := context.Background()
sc.logger.WithFields(logrus.Fields{
"subreddit#id": delivery.Payload(),
}).Debug("starting job")
id, err := strconv.ParseInt(delivery.Payload(), 10, 64)
if err != nil {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": delivery.Payload(),
"err": err,
}).Error("failed to parse subreddit ID")
_ = delivery.Reject()
return
}
defer func() { _ = delivery.Ack() }()
subreddit, err := sc.subredditRepo.GetByID(ctx, id)
if err != nil {
sc.logger.WithFields(logrus.Fields{
"err": err,
}).Error("failed to fetch subreddit from database")
return
}
watchers, err := sc.watcherRepo.GetBySubredditID(ctx, subreddit.ID)
if err != nil {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"err": err,
}).Error("failed to fetch watchers from database")
return
}
if len(watchers) == 0 {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
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}).Debug("no watchers for subreddit, finishing job")
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return
}
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threshold := time.Now().Add(-24 * time.Hour)
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posts := []*reddit.Thing{}
before := ""
finished := false
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seenPosts := map[string]bool{}
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// Load 500 newest posts
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
}).Debug("loading up to 500 new posts")
for page := 0; page < 5; page++ {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"page": page,
}).Debug("loading new posts")
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i := rand.Intn(len(watchers))
watcher := watchers[i]
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acc, _ := sc.accountRepo.GetByID(ctx, watcher.AccountID)
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rac := sc.reddit.NewAuthenticatedClient(acc.AccountID, acc.RefreshToken, acc.AccessToken)
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sps, err := rac.SubredditNew(
subreddit.Name,
reddit.WithQuery("before", before),
reddit.WithQuery("limit", "100"),
)
if err != nil {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"err": err,
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}).Error("failed to fetch new posts")
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continue
}
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"count": sps.Count,
"page": page,
}).Debug("loaded new posts for page")
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// If it's empty, we're done
if sps.Count == 0 {
break
}
// If we don't have 100 posts, we're going to be done
if sps.Count < 100 {
finished = true
}
for _, post := range sps.Children {
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if post.CreatedAt.Before(threshold) {
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finished = true
break
}
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if _, ok := seenPosts[post.ID]; !ok {
posts = append(posts, post)
seenPosts[post.ID] = true
}
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}
if finished {
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"page": page,
}).Debug("reached date threshold")
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break
}
}
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// Load hot posts
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
}).Debug("loading hot posts")
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{
i := rand.Intn(len(watchers))
watcher := watchers[i]
acc, _ := sc.accountRepo.GetByID(ctx, watcher.AccountID)
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rac := sc.reddit.NewAuthenticatedClient(acc.AccountID, acc.RefreshToken, acc.AccessToken)
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sps, err := rac.SubredditHot(
subreddit.Name,
reddit.WithQuery("limit", "100"),
)
if err != nil {
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"err": err,
}).Error("failed to fetch hot posts")
} else {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"count": sps.Count,
}).Debug("loaded hot posts")
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for _, post := range sps.Children {
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if post.CreatedAt.Before(threshold) {
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break
}
if _, ok := seenPosts[post.ID]; !ok {
posts = append(posts, post)
seenPosts[post.ID] = true
}
}
}
}
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"count": len(posts),
}).Debug("checking posts for hits")
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for _, post := range posts {
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lowcaseAuthor := strings.ToLower(post.Author)
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lowcaseTitle := strings.ToLower(post.Title)
lowcaseFlair := strings.ToLower(post.Flair)
lowcaseDomain := strings.ToLower(post.URL)
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notifs := []domain.Watcher{}
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for _, watcher := range watchers {
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// Make sure we only alert on posts created after the search
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if watcher.CreatedAt.After(post.CreatedAt) {
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continue
}
matched := true
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if watcher.Author != "" && lowcaseAuthor != watcher.Author {
matched = false
}
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if watcher.Upvotes > 0 && post.Score < watcher.Upvotes {
matched = false
}
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if watcher.Keyword != "" && !strings.Contains(lowcaseTitle, watcher.Keyword) {
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matched = false
}
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if watcher.Flair != "" && !strings.Contains(lowcaseFlair, watcher.Flair) {
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matched = false
}
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if watcher.Domain != "" && !strings.Contains(lowcaseDomain, watcher.Domain) {
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matched = false
}
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if !matched {
continue
}
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lockKey := fmt.Sprintf("watcher:%d:%s", watcher.DeviceID, post.ID)
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notified, _ := sc.redis.Get(ctx, lockKey).Bool()
if notified {
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"watcher#id": watcher.ID,
"post#id": post.ID,
}).Debug("already notified, skipping")
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continue
}
if err := sc.watcherRepo.IncrementHits(ctx, watcher.ID); err != nil {
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"watcher#id": watcher.ID,
"err": err,
}).Error("could not increment hits")
return
}
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"watcher#id": watcher.ID,
"post#id": post.ID,
}).Debug("got a hit")
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sc.redis.SetEX(ctx, lockKey, true, 24*time.Hour)
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notifs = append(notifs, watcher)
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}
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if len(notifs) == 0 {
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continue
}
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
"post#id": post.ID,
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"count": len(notifs),
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}).Debug("got hits for post")
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payload := payloadFromPost(post)
for _, watcher := range notifs {
title := fmt.Sprintf(subredditNotificationTitleFormat, watcher.Label)
payload.AlertTitle(title)
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body := fmt.Sprintf(subredditNotificationBodyFormat, subreddit.Name, post.Title)
payload.AlertBody(body)
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notification := &apns2.Notification{}
notification.Topic = "com.christianselig.Apollo"
notification.DeviceToken = watcher.Device.APNSToken
notification.Payload = payload
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client := sc.apnsProduction
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if watcher.Device.Sandbox {
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client = sc.apnsSandbox
}
res, err := client.Push(notification)
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if err != nil || !res.Sent() {
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_ = sc.statsd.Incr("apns.notification.errors", []string{}, 1)
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
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"device#id": watcher.Device.ID,
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"err": err,
"status": res.StatusCode,
"reason": res.Reason,
}).Error("failed to send notification")
} else {
_ = sc.statsd.Incr("apns.notification.sent", []string{}, 1)
sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
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"device#id": watcher.Device.ID,
"device#token": watcher.Device.APNSToken,
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}).Info("sent notification")
}
}
}
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sc.logger.WithFields(logrus.Fields{
"subreddit#id": subreddit.ID,
"subreddit#name": subreddit.Name,
}).Debug("finishing job")
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}
func payloadFromPost(post *reddit.Thing) *payload.Payload {
payload := payload.
NewPayload().
AlertSummaryArg(post.Subreddit).
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Category("subreddit-watcher").
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Custom("post_title", post.Title).
Custom("post_id", post.ID).
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Custom("subreddit", post.Subreddit).
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Custom("author", post.Author).
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Custom("post_age", post.CreatedAt).
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ThreadID("subreddit-watcher").
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MutableContent().
Sound("traloop.wav")
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if post.Thumbnail != "" {
payload.Custom("thumbnail", post.Thumbnail)
}
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return payload
}