apollo-backend/internal/cmd/scheduler.go

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package cmd
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import (
"context"
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"encoding/json"
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"fmt"
"strconv"
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"time"
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"github.com/DataDog/datadog-go/statsd"
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"github.com/adjust/rmq/v4"
"github.com/christianselig/apollo-backend/internal/cmdutil"
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"github.com/go-co-op/gocron"
"github.com/go-redis/redis/v8"
"github.com/jackc/pgx/v4"
"github.com/jackc/pgx/v4/pgxpool"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
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)
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const (
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batchSize = 200
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checkTimeout = 60 // how long until we force a check
enqueueTimeout = 5 // how long until we try to re-enqueue
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)
func SchedulerCmd(ctx context.Context) *cobra.Command {
cmd := &cobra.Command{
Use: "scheduler",
Args: cobra.ExactArgs(0),
Short: "Schedules jobs and runs several maintenance tasks periodically.",
RunE: func(cmd *cobra.Command, args []string) error {
logger := cmdutil.NewLogrusLogger(false)
statsd, err := cmdutil.NewStatsdClient()
if err != nil {
return err
}
defer statsd.Close()
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db, err := cmdutil.NewDatabasePool(ctx, 1)
if err != nil {
return err
}
defer db.Close()
redis, err := cmdutil.NewRedisClient(ctx)
if err != nil {
return err
}
defer redis.Close()
queue, err := cmdutil.NewQueueClient(logger, redis, "worker")
if err != nil {
return err
}
// Eval lua so that we don't keep parsing it
luaSha, err := evalScript(ctx, redis)
if err != nil {
return err
}
notifQueue, err := queue.OpenQueue("notifications")
if err != nil {
return err
}
s := gocron.NewScheduler(time.UTC)
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s.Every(200).Milliseconds().SingletonMode().Do(func() { enqueueAccounts(ctx, logger, statsd, db, redis, luaSha, notifQueue) })
s.Every(1).Second().Do(func() { cleanQueues(ctx, logger, queue) })
s.Every(1).Minute().Do(func() { reportStats(ctx, logger, statsd, db, redis) })
s.Every(1).Minute().Do(func() { cleanAccounts(ctx, logger, db) })
s.StartAsync()
<-ctx.Done()
s.Stop()
return nil
},
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}
return cmd
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}
func evalScript(ctx context.Context, redis *redis.Client) (string, error) {
lua := fmt.Sprintf(`
local retv={}
local ids=cjson.decode(ARGV[1])
for i=1, #ids do
local key = KEYS[1] .. ":" .. ids[i]
if redis.call("exists", key) == 0 then
redis.call("setex", key, %d, 1)
retv[#retv + 1] = ids[i]
end
end
return retv
`, checkTimeout)
return redis.ScriptLoad(ctx, lua).Result()
}
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func cleanAccounts(ctx context.Context, logger *logrus.Logger, pool *pgxpool.Pool) {
now := time.Now().Unix() - 7200
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count := 0
ids := []int64{}
err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
stmt := `
WITH account AS (
SELECT id
FROM accounts
WHERE
expires_at < $1
)
DELETE FROM accounts
WHERE accounts.id IN(SELECT id FROM account)
RETURNING accounts.id`
rows, err := tx.Query(ctx, stmt, now)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var id int64
rows.Scan(&id)
ids = append(ids, id)
count++
}
return nil
})
if err != nil {
logger.WithFields(logrus.Fields{
"err": err,
}).Error("failed cleaning stale accounts")
return
}
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if count > 0 {
logger.WithFields(logrus.Fields{
"count": count,
}).Info("cleaned stale accounts")
}
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}
func cleanQueues(ctx context.Context, logger *logrus.Logger, jobsConn rmq.Connection) {
cleaner := rmq.NewCleaner(jobsConn)
count, err := cleaner.Clean()
if err != nil {
logger.WithFields(logrus.Fields{
"err": err,
}).Error("failed cleaning jobs from queues")
return
}
logger.WithFields(logrus.Fields{
"count": count,
}).Debug("returned jobs to queues")
}
func reportStats(ctx context.Context, logger *logrus.Logger, statsd *statsd.Client, pool *pgxpool.Pool, redisConn *redis.Client) {
var (
count int64
metrics = []struct {
query string
name string
}{
{"SELECT COUNT(*) FROM accounts", "apollo.registrations.accounts"},
{"SELECT COUNT(*) FROM devices", "apollo.registrations.devices"},
}
)
for _, metric := range metrics {
pool.QueryRow(ctx, metric.query).Scan(&count)
statsd.Gauge(metric.name, float64(count), []string{}, 1)
logger.WithFields(logrus.Fields{
"count": count,
"metric": metric.name,
}).Debug("fetched metrics")
}
}
func enqueueAccounts(ctx context.Context, logger *logrus.Logger, statsd *statsd.Client, pool *pgxpool.Pool, redisConn *redis.Client, luaSha string, queue rmq.Queue) {
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start := time.Now()
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now := float64(time.Now().UnixNano()/int64(time.Millisecond)) / 1000
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// Start looking for accounts that were last checked at least 5 seconds ago
// and at most 6 seconds ago. Also look for accounts that haven't been checked
// in over a minute.
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ts := start.Unix()
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ready := ts - enqueueTimeout
expired := ts - checkTimeout
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ids := []int64{}
err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
stmt := `
WITH account AS (
SELECT id
FROM accounts
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WHERE
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last_enqueued_at < $1
OR last_checked_at < $2
ORDER BY last_checked_at
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LIMIT 1000
FOR UPDATE SKIP LOCKED
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)
UPDATE accounts
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SET last_enqueued_at = $3
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WHERE accounts.id IN(SELECT id FROM account)
RETURNING accounts.id`
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rows, err := tx.Query(ctx, stmt, ready, expired, now)
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if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var id int64
rows.Scan(&id)
ids = append(ids, id)
}
return nil
})
if err != nil {
logger.WithFields(logrus.Fields{
"err": err,
}).Error("failed to fetch batch of accounts")
return
}
logger.WithFields(logrus.Fields{
"count": len(ids),
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"start": ready,
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}).Debug("enqueueing account batch")
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enqueued := 0
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skipped := 0
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// Split ids in batches
for i := 0; i < len(ids); i += batchSize {
j := i + batchSize
if j > len(ids) {
j = len(ids)
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}
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batch := Int64Slice(ids[i:j])
logger.WithFields(logrus.Fields{
"len": len(batch),
}).Debug("enqueueing batch")
res, err := redisConn.EvalSha(ctx, luaSha, []string{"locks:accounts"}, batch).Result()
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if err != nil {
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logger.WithFields(logrus.Fields{
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"err": err,
}).Error("failed to check for locked accounts")
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}
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vals := res.([]interface{})
skipped += len(batch) - len(vals)
enqueued += len(vals)
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if len(vals) == 0 {
continue
}
batchIds := make([]string, len(vals))
for k, v := range vals {
batchIds[k] = strconv.FormatInt(v.(int64), 10)
}
if err = queue.Publish(batchIds...); err != nil {
logger.WithFields(logrus.Fields{
"err": err,
}).Error("failed to enqueue account")
}
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}
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statsd.Histogram("apollo.queue.enqueued", float64(enqueued), []string{}, 1)
statsd.Histogram("apollo.queue.skipped", float64(skipped), []string{}, 1)
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statsd.Histogram("apollo.queue.runtime", float64(time.Now().Sub(start).Milliseconds()), []string{}, 1)
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logger.WithFields(logrus.Fields{
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"count": enqueued,
"skipped": skipped,
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"start": ready,
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}).Debug("done enqueueing account batch")
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}
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type Int64Slice []int64
func (ii Int64Slice) MarshalBinary() (data []byte, err error) {
bytes, err := json.Marshal(ii)
return bytes, err
}