359 lines
9.4 KiB
Go
359 lines
9.4 KiB
Go
package worker
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import (
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"context"
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"fmt"
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"math/rand"
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"os"
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"sort"
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"strconv"
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"time"
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"github.com/DataDog/datadog-go/statsd"
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"github.com/adjust/rmq/v5"
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"github.com/go-redis/redis/v8"
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"github.com/jackc/pgx/v5/pgxpool"
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"github.com/sideshow/apns2"
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"github.com/sideshow/apns2/payload"
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"github.com/sideshow/apns2/token"
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"go.opentelemetry.io/otel/trace"
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"go.uber.org/zap"
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"github.com/christianselig/apollo-backend/internal/domain"
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"github.com/christianselig/apollo-backend/internal/reddit"
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"github.com/christianselig/apollo-backend/internal/repository"
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)
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type trendingWorker struct {
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context.Context
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logger *zap.Logger
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tracer trace.Tracer
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statsd *statsd.Client
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redis *redis.Client
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queue rmq.Connection
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reddit *reddit.Client
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apns *token.Token
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consumers int
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accountRepo domain.AccountRepository
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deviceRepo domain.DeviceRepository
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subredditRepo domain.SubredditRepository
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watcherRepo domain.WatcherRepository
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}
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const trendingNotificationTitleFormat = "🔥 r/%s Trending"
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func NewTrendingWorker(ctx context.Context, logger *zap.Logger, tracer trace.Tracer, statsd *statsd.Client, db *pgxpool.Pool, redis *redis.Client, queue rmq.Connection, consumers int) Worker {
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reddit := reddit.NewClient(
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os.Getenv("REDDIT_CLIENT_ID"),
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os.Getenv("REDDIT_CLIENT_SECRET"),
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tracer,
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statsd,
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redis,
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consumers,
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)
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var apns *token.Token
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{
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authKey, err := token.AuthKeyFromFile(os.Getenv("APPLE_KEY_PATH"))
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if err != nil {
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panic(err)
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}
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apns = &token.Token{
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AuthKey: authKey,
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KeyID: os.Getenv("APPLE_KEY_ID"),
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TeamID: os.Getenv("APPLE_TEAM_ID"),
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}
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}
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return &trendingWorker{
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ctx,
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logger,
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tracer,
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statsd,
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redis,
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queue,
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reddit,
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apns,
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consumers,
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repository.NewPostgresAccount(db),
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repository.NewPostgresDevice(db),
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repository.NewPostgresSubreddit(db),
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repository.NewPostgresWatcher(db),
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}
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}
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func (tw *trendingWorker) Start() error {
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queue, err := tw.queue.OpenQueue("trending")
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if err != nil {
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return err
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}
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tw.logger.Info("starting up trending subreddits worker", zap.Int("consumers", tw.consumers))
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prefetchLimit := int64(tw.consumers * 2)
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if err := queue.StartConsuming(prefetchLimit, pollDuration); err != nil {
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return err
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}
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host, _ := os.Hostname()
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for i := 0; i < tw.consumers; i++ {
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name := fmt.Sprintf("consumer %s-%d", host, i)
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consumer := NewTrendingConsumer(tw, i)
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if _, err := queue.AddConsumer(name, consumer); err != nil {
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return err
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}
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}
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return nil
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}
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func (tw *trendingWorker) Stop() {
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<-tw.queue.StopAllConsuming() // wait for all Consume() calls to finish
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}
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type trendingConsumer struct {
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*trendingWorker
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tag int
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apnsSandbox *apns2.Client
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apnsProduction *apns2.Client
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}
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func NewTrendingConsumer(tw *trendingWorker, tag int) *trendingConsumer {
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return &trendingConsumer{
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tw,
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tag,
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apns2.NewTokenClient(tw.apns),
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apns2.NewTokenClient(tw.apns).Production(),
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}
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}
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func (tc *trendingConsumer) Consume(delivery rmq.Delivery) {
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ctx, cancel := context.WithCancel(tc)
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defer cancel()
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id, err := strconv.ParseInt(delivery.Payload(), 10, 64)
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if err != nil {
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tc.logger.Error("failed to parse subreddit id from payload", zap.Error(err), zap.String("payload", delivery.Payload()))
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_ = delivery.Reject()
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return
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}
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tc.logger.Debug("starting job", zap.Int64("subreddit#id", id))
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defer func() { _ = delivery.Ack() }()
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subreddit, err := tc.subredditRepo.GetByID(ctx, id)
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if err != nil {
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tc.logger.Error("failed to fetch subreddit from database", zap.Error(err), zap.Int64("subreddit#id", id))
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return
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}
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watchers, err := tc.watcherRepo.GetByTrendingSubredditID(ctx, subreddit.ID)
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if err != nil {
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tc.logger.Error("failed to fetch watchers from database",
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zap.Error(err),
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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)
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return
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}
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if len(watchers) == 0 {
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tc.logger.Debug("no watchers for subreddit, bailing early",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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)
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return
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}
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// Grab last month's top posts so we calculate a trending average
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i := rand.Intn(len(watchers))
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watcher := watchers[i]
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rac := tc.reddit.NewAuthenticatedClient(watcher.Account.AccountID, watcher.Account.RefreshToken, watcher.Account.AccessToken)
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tps, err := rac.SubredditTop(ctx, subreddit.Name, reddit.WithQuery("t", "week"), reddit.WithQuery("show", "all"), reddit.WithQuery("limit", "25"))
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if err != nil {
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tc.logger.Error("failed to fetch weeks's top posts",
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zap.Error(err),
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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)
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return
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}
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tc.logger.Debug("loaded weeks's top posts",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int("count", tps.Count),
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)
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if tps.Count < 20 {
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tc.logger.Debug("no top posts, bailing early",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int("count", tps.Count),
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)
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return
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}
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sort.SliceStable(tps.Children, func(i, j int) bool {
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return tps.Children[i].Score > tps.Children[j].Score
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})
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middlePost := tps.Count / 2
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medianScore := tps.Children[middlePost].Score
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tc.logger.Debug("calculated median score",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int64("score", medianScore),
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)
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// Grab hot posts and filter out anything that's > 2 days old
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i = rand.Intn(len(watchers))
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watcher = watchers[i]
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rac = tc.reddit.NewAuthenticatedClient(watcher.Account.AccountID, watcher.Account.RefreshToken, watcher.Account.AccessToken)
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hps, err := rac.SubredditHot(ctx, subreddit.Name, reddit.WithQuery("show", "all"), reddit.WithQuery("always_show_media", "1"))
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if err != nil {
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tc.logger.Error("failed to fetch hot posts",
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zap.Error(err),
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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)
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return
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}
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tc.logger.Debug("loaded hot posts",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int("count", hps.Count),
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)
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// Trending only counts for posts less than 2 days old
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threshold := time.Now().Add(-24 * time.Hour * 2)
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for _, post := range hps.Children {
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if post.Score < medianScore {
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continue
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}
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if post.CreatedAt.Before(threshold) {
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break
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}
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notification := &apns2.Notification{}
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notification.Topic = "com.christianselig.Apollo"
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notification.Payload = payloadFromTrendingPost(post)
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for _, watcher := range watchers {
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if watcher.CreatedAt.After(post.CreatedAt) {
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continue
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}
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lockKey := fmt.Sprintf("watcher:trending:%d:%s", watcher.DeviceID, post.ID)
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notified, _ := tc.redis.Get(ctx, lockKey).Bool()
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if notified {
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tc.logger.Debug("already notified, skipping",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int64("watcher#id", watcher.ID),
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zap.String("post#id", post.ID),
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)
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continue
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}
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tc.redis.SetEX(ctx, lockKey, true, 48*time.Hour)
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if err := tc.watcherRepo.IncrementHits(ctx, watcher.ID); err != nil {
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tc.logger.Error("could not increment hits",
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zap.Error(err),
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.Int64("watcher#id", watcher.ID),
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)
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return
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}
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notification.DeviceToken = watcher.Device.APNSToken
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client := tc.apnsProduction
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if watcher.Device.Sandbox {
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client = tc.apnsSandbox
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}
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res, err := client.Push(notification)
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if err != nil {
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_ = tc.statsd.Incr("apns.notification.errors", []string{}, 1)
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tc.logger.Error("failed to send notification",
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zap.Error(err),
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.String("post#id", post.ID),
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zap.String("apns", watcher.Device.APNSToken),
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zap.Int64("median_score", medianScore),
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)
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} else if !res.Sent() {
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_ = tc.statsd.Incr("apns.notification.errors", []string{}, 1)
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tc.logger.Error("notification not sent",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.String("post#id", post.ID),
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zap.String("apns", watcher.Device.APNSToken),
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zap.Int64("median_score", medianScore),
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zap.Int("response#status", res.StatusCode),
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zap.String("response#reason", res.Reason),
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)
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} else {
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_ = tc.statsd.Incr("apns.notification.sent", []string{}, 1)
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tc.logger.Info("sent notification",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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zap.String("post#id", post.ID),
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zap.Int64("post#score", post.Score),
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zap.String("device#token", watcher.Device.APNSToken),
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zap.Int64("median_score", medianScore),
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)
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}
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}
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}
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tc.logger.Debug("finishing job",
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zap.Int64("subreddit#id", id),
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zap.String("subreddit#name", subreddit.NormalizedName()),
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)
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}
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func payloadFromTrendingPost(post *reddit.Thing) *payload.Payload {
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title := fmt.Sprintf(trendingNotificationTitleFormat, post.Subreddit)
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payload := payload.
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NewPayload().
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AlertTitle(title).
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AlertBody(post.Title).
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AlertSummaryArg(post.Subreddit).
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Category("trending-post").
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Custom("post_title", post.Title).
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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("trending-post").
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MutableContent().
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Sound("traloop.wav")
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if post.Thumbnail != "" && !post.Over18 {
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payload.Custom("thumbnail", post.Thumbnail)
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}
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return payload
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}
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