mirror of
https://github.com/christianselig/apollo-backend
synced 2024-06-02 23:57:15 +00:00
491 lines
12 KiB
Go
491 lines
12 KiB
Go
package cmd
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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_ "net/http/pprof"
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"strconv"
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"sync"
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"time"
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"github.com/DataDog/datadog-go/statsd"
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"github.com/adjust/rmq/v4"
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"github.com/go-co-op/gocron"
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"github.com/go-redis/redis/v8"
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"github.com/jackc/pgx/v4"
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"github.com/jackc/pgx/v4/pgxpool"
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"github.com/spf13/cobra"
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"go.uber.org/zap"
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"github.com/christianselig/apollo-backend/internal/cmdutil"
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"github.com/christianselig/apollo-backend/internal/domain"
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"github.com/christianselig/apollo-backend/internal/repository"
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)
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const (
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batchSize = 1000
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maxNotificationChecks = 5000
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)
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func SchedulerCmd(ctx context.Context) *cobra.Command {
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cmd := &cobra.Command{
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Use: "scheduler",
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Args: cobra.ExactArgs(0),
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Short: "Schedules jobs and runs several maintenance tasks periodically.",
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RunE: func(cmd *cobra.Command, args []string) error {
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logger := cmdutil.NewLogger("scheduler")
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defer func() { _ = logger.Sync() }()
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statsd, err := cmdutil.NewStatsdClient()
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if err != nil {
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return err
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}
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defer statsd.Close()
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db, err := cmdutil.NewDatabasePool(ctx, 1)
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if err != nil {
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return err
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}
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defer db.Close()
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redis, err := cmdutil.NewRedisClient(ctx)
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if err != nil {
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return err
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}
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defer redis.Close()
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queue, err := cmdutil.NewQueueClient(logger, redis, "worker")
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if err != nil {
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return err
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}
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// Eval lua so that we don't keep parsing it
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luaSha, err := evalScript(ctx, redis)
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if err != nil {
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return err
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}
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notifQueue, err := queue.OpenQueue("notifications")
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if err != nil {
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return err
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}
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subredditQueue, err := queue.OpenQueue("subreddits")
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if err != nil {
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return err
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}
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trendingQueue, err := queue.OpenQueue("trending")
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if err != nil {
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return err
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}
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userQueue, err := queue.OpenQueue("users")
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if err != nil {
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return err
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}
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stuckNotificationsQueue, err := queue.OpenQueue("stuck-notifications")
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if err != nil {
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return err
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}
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s := gocron.NewScheduler(time.UTC)
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_, _ = s.Every(500).Milliseconds().Do(func() { enqueueAccounts(ctx, logger, statsd, db, redis, luaSha, notifQueue) })
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_, _ = s.Every(5).Second().Do(func() { enqueueSubreddits(ctx, logger, statsd, db, []rmq.Queue{subredditQueue, trendingQueue}) })
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_, _ = s.Every(5).Second().Do(func() { enqueueUsers(ctx, logger, statsd, db, userQueue) })
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_, _ = s.Every(5).Second().Do(func() { cleanQueues(logger, queue) })
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_, _ = s.Every(5).Second().Do(func() { enqueueStuckAccounts(ctx, logger, statsd, db, stuckNotificationsQueue) })
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_, _ = s.Every(1).Minute().Do(func() { reportStats(ctx, logger, statsd, db) })
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_, _ = s.Every(1).Minute().Do(func() { pruneAccounts(ctx, logger, db) })
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_, _ = s.Every(1).Minute().Do(func() { pruneDevices(ctx, logger, db) })
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s.StartAsync()
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srv := &http.Server{Addr: ":8080"}
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go func() { _ = srv.ListenAndServe() }()
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<-ctx.Done()
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s.Stop()
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return nil
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},
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}
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return cmd
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}
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func evalScript(ctx context.Context, redis *redis.Client) (string, error) {
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lua := fmt.Sprintf(`
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local retv={}
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for i=1, #ARGV do
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local key = KEYS[1] .. ":" .. ARGV[i]
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if redis.call("exists", key) == 0 then
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redis.call("setex", key, %.0f, 1)
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retv[#retv + 1] = ARGV[i]
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end
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end
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return retv
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`, domain.NotificationCheckTimeout.Seconds())
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return redis.ScriptLoad(ctx, lua).Result()
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}
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func pruneAccounts(ctx context.Context, logger *zap.Logger, pool *pgxpool.Pool) {
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expiry := time.Now().Add(-domain.StaleTokenThreshold)
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ar := repository.NewPostgresAccount(pool)
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stale, err := ar.PruneStale(ctx, expiry)
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if err != nil {
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logger.Error("failed to clean stale accounts", zap.Error(err))
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return
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}
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orphaned, err := ar.PruneOrphaned(ctx)
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if err != nil {
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logger.Error("failed to clean orphaned accounts", zap.Error(err))
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return
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}
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if count := stale + orphaned; count > 0 {
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logger.Info("pruned accounts", zap.Int64("stale", stale), zap.Int64("orphaned", orphaned))
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}
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}
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func pruneDevices(ctx context.Context, logger *zap.Logger, pool *pgxpool.Pool) {
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now := time.Now()
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dr := repository.NewPostgresDevice(pool)
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count, err := dr.PruneStale(ctx, now)
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if err != nil {
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logger.Error("failed to clean stale devices", zap.Error(err))
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return
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}
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if count > 0 {
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logger.Info("pruned devices", zap.Int64("count", count))
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}
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}
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func cleanQueues(logger *zap.Logger, jobsConn rmq.Connection) {
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cleaner := rmq.NewCleaner(jobsConn)
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count, err := cleaner.Clean()
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if err != nil {
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logger.Error("failed to clean jobs from queues", zap.Error(err))
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return
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}
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if count > 0 {
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logger.Info("returned jobs to queues", zap.Int64("count", count))
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}
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}
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func reportStats(ctx context.Context, logger *zap.Logger, statsd *statsd.Client, pool *pgxpool.Pool) {
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var (
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count int64
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metrics = []struct {
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query string
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name string
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}{
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{"SELECT COUNT(*) FROM accounts", "apollo.registrations.accounts"},
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{"SELECT COUNT(*) FROM devices", "apollo.registrations.devices"},
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{"SELECT COUNT(*) FROM subreddits", "apollo.registrations.subreddits"},
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{"SELECT COUNT(*) FROM users", "apollo.registrations.users"},
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}
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)
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for _, metric := range metrics {
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_ = pool.QueryRow(ctx, metric.query).Scan(&count)
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_ = statsd.Gauge(metric.name, float64(count), []string{}, 1)
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logger.Debug("fetched metrics", zap.String("metric", metric.name), zap.Int64("count", count))
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}
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}
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func enqueueUsers(ctx context.Context, logger *zap.Logger, statsd *statsd.Client, pool *pgxpool.Pool, queue rmq.Queue) {
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now := time.Now()
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next := now.Add(domain.NotificationCheckInterval)
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ids := []int64{}
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defer func() {
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tags := []string{"queue:users"}
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_ = statsd.Histogram("apollo.queue.enqueued", float64(len(ids)), tags, 1)
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_ = statsd.Histogram("apollo.queue.runtime", float64(time.Since(now).Milliseconds()), tags, 1)
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}()
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err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
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stmt := `
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UPDATE users
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SET next_check_at = $2
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WHERE id IN (
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SELECT id
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FROM users
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WHERE next_check_at < $1
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ORDER BY next_check_at
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FOR UPDATE SKIP LOCKED
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LIMIT 100
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)
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RETURNING users.id`
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rows, err := tx.Query(ctx, stmt, now, next)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var id int64
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_ = rows.Scan(&id)
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ids = append(ids, id)
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}
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return nil
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})
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if err != nil {
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logger.Error("failed to fetch batch of users", zap.Error(err))
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return
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}
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if len(ids) == 0 {
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return
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}
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logger.Debug("enqueueing user batch", zap.Int("count", len(ids)), zap.Time("start", now))
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batchIds := make([]string, len(ids))
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for i, id := range ids {
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batchIds[i] = strconv.FormatInt(id, 10)
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}
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if err = queue.Publish(batchIds...); err != nil {
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logger.Error("failed to enqueue user batch", zap.Error(err))
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}
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}
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func enqueueSubreddits(ctx context.Context, logger *zap.Logger, statsd *statsd.Client, pool *pgxpool.Pool, queues []rmq.Queue) {
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now := time.Now()
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next := now.Add(domain.SubredditCheckInterval)
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ids := []int64{}
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defer func() {
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tags := []string{"queue:subreddits"}
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_ = statsd.Histogram("apollo.queue.enqueued", float64(len(ids)), tags, 1)
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_ = statsd.Histogram("apollo.queue.runtime", float64(time.Since(now).Milliseconds()), tags, 1)
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}()
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err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
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stmt := `
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UPDATE subreddits
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SET next_check_at = $2
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WHERE subreddits.id IN(
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SELECT id
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FROM subreddits
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WHERE next_check_at < $1
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ORDER BY next_check_at
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FOR UPDATE SKIP LOCKED
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LIMIT 100
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)
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RETURNING subreddits.id`
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rows, err := tx.Query(ctx, stmt, now, next)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var id int64
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_ = rows.Scan(&id)
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ids = append(ids, id)
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}
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return nil
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})
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if err != nil {
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logger.Error("failed to fetch batch of subreddits", zap.Error(err))
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return
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}
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if len(ids) == 0 {
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return
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}
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logger.Debug("enqueueing subreddit batch", zap.Int("count", len(ids)), zap.Time("start", now))
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batchIds := make([]string, len(ids))
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for i, id := range ids {
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batchIds[i] = strconv.FormatInt(id, 10)
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}
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for _, queue := range queues {
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if err = queue.Publish(batchIds...); err != nil {
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logger.Error("failed to enqueue subreddit batch", zap.Error(err))
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}
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}
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}
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func enqueueStuckAccounts(ctx context.Context, logger *zap.Logger, statsd *statsd.Client, pool *pgxpool.Pool, queue rmq.Queue) {
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now := time.Now()
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next := now.Add(domain.StuckNotificationCheckInterval)
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ids := []int64{}
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defer func() {
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tags := []string{"queue:stuck-accounts"}
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_ = statsd.Histogram("apollo.queue.enqueued", float64(len(ids)), tags, 1)
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_ = statsd.Histogram("apollo.queue.runtime", float64(time.Since(now).Milliseconds()), tags, 1)
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}()
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err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
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stmt := `
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UPDATE accounts
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SET next_stuck_notification_check_at = $2
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WHERE accounts.id IN(
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SELECT id
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FROM accounts
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WHERE next_stuck_notification_check_at < $1
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ORDER BY next_stuck_notification_check_at
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FOR UPDATE SKIP LOCKED
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LIMIT 500
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)
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RETURNING accounts.id`
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rows, err := tx.Query(ctx, stmt, now, next)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var id int64
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_ = rows.Scan(&id)
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ids = append(ids, id)
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}
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return nil
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})
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if err != nil {
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logger.Error("failed to fetch accounts", zap.Error(err))
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return
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}
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if len(ids) == 0 {
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return
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}
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logger.Debug("enqueueing stuck account batch", zap.Int("count", len(ids)), zap.Time("start", now))
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batchIds := make([]string, len(ids))
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for i, id := range ids {
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batchIds[i] = strconv.FormatInt(id, 10)
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}
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if err = queue.Publish(batchIds...); err != nil {
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logger.Error("failed to enqueue stuck account batch", zap.Error(err))
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}
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}
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func enqueueAccounts(ctx context.Context, logger *zap.Logger, statsd *statsd.Client, pool *pgxpool.Pool, redisConn *redis.Client, luaSha string, queue rmq.Queue) {
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now := time.Now()
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next := now.Add(domain.NotificationCheckInterval)
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ids := make([]string, maxNotificationChecks)
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idslen := 0
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enqueued := 0
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skipped := 0
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defer func() {
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tags := []string{"queue:notifications"}
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_ = statsd.Histogram("apollo.queue.enqueued", float64(enqueued), tags, 1)
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_ = statsd.Histogram("apollo.queue.skipped", float64(skipped), tags, 1)
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_ = statsd.Histogram("apollo.queue.runtime", float64(time.Since(now).Milliseconds()), tags, 1)
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}()
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err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
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stmt := fmt.Sprintf(`
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UPDATE accounts
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SET next_notification_check_at = $2
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WHERE accounts.id IN(
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SELECT id
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FROM accounts
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WHERE next_notification_check_at < $1
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ORDER BY next_notification_check_at
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FOR UPDATE SKIP LOCKED
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LIMIT %d
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)
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RETURNING accounts.reddit_account_id`, maxNotificationChecks)
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rows, err := tx.Query(ctx, stmt, now, next)
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if err != nil {
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return err
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}
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defer rows.Close()
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for i := 0; rows.Next(); i++ {
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_ = rows.Scan(&ids[i])
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idslen = i
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}
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return nil
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})
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if err != nil {
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logger.Error("failed to fetch batch of accounts", zap.Error(err))
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return
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}
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if idslen == 0 {
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return
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}
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logger.Debug("enqueueing account batch", zap.Int("count", len(ids)), zap.Time("start", now))
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// Split ids in batches
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wg := sync.WaitGroup{}
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for i := 0; i < idslen; i += batchSize {
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wg.Add(1)
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go func(offset int) {
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defer wg.Done()
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j := offset + batchSize
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if j > idslen {
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j = idslen
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}
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batch := ids[offset:j]
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logger.Debug("enqueueing batch", zap.Int("len", len(batch)))
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res, err := redisConn.EvalSha(ctx, luaSha, []string{"locks:accounts"}, batch).Result()
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if err != nil {
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logger.Error("failed to check for locked accounts", zap.Error(err))
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}
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vals := res.([]interface{})
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skipped += len(batch) - len(vals)
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enqueued += len(vals)
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if len(vals) == 0 {
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return
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}
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batchIds := make([]string, len(vals))
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for k, v := range vals {
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batchIds[k] = v.(string)
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}
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if err = queue.Publish(batchIds...); err != nil {
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logger.Error("failed to enqueue account batch", zap.Error(err))
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}
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}(i)
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}
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wg.Wait()
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logger.Debug("done enqueueing account batch", zap.Int("count", enqueued), zap.Int("skipped", skipped), zap.Time("start", now))
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}
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type Int64Slice []int64
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func (ii Int64Slice) MarshalBinary() (data []byte, err error) {
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bytes, err := json.Marshal(ii)
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return bytes, err
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}
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