apollo-backend/cmd/apollo-scheduler/main.go

169 lines
3.4 KiB
Go
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2021-07-08 23:03:46 +00:00
package main
import (
"context"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/adjust/rmq/v4"
"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/joho/godotenv"
"github.com/sirupsen/logrus"
)
func main() {
_ = godotenv.Load()
errChan := make(chan error, 10)
go logErrors(errChan)
ctx, cancel := context.WithCancel(context.Background())
var logger *logrus.Logger
{
logger = logrus.New()
if os.Getenv("ENV") == "" {
logger.SetLevel(logrus.DebugLevel)
} else {
logger.SetFormatter(&logrus.TextFormatter{
DisableColors: true,
FullTimestamp: true,
})
}
}
// Set up Postgres connection
var pool *pgxpool.Pool
{
config, err := pgxpool.ParseConfig(os.Getenv("DATABASE_CONNECTION_POOL_URL"))
if err != nil {
panic(err)
}
// Setting the build statement cache to nil helps this work with pgbouncer
config.ConnConfig.BuildStatementCache = nil
config.ConnConfig.PreferSimpleProtocol = true
pool, err = pgxpool.ConnectConfig(ctx, config)
if err != nil {
panic(err)
}
defer pool.Close()
}
// Set up Redis connection
var redisConn *redis.Client
{
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opt, err := redis.ParseURL(os.Getenv("REDISCLOUD_URL"))
if err != nil {
panic(err)
}
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redisConn = redis.NewClient(opt)
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if err := redisConn.Ping(ctx).Err(); err != nil {
panic(err)
}
}
// Set up queues
var (
notificationsQueue rmq.Queue
)
{
connection, err := rmq.OpenConnectionWithRedisClient("producer", redisConn, errChan)
if err != nil {
panic(err)
}
notificationsQueue, err = connection.OpenQueue("notifications")
if err != nil {
panic(err)
}
}
s := gocron.NewScheduler(time.UTC)
s.Every(1).Second().Do(func() { enqueueAccounts(ctx, logger, pool, redisConn, notificationsQueue) })
s.StartAsync()
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT)
defer signal.Stop(signals)
<-signals // wait for signal
cancel()
go func() {
<-signals // hard exit on second signal (in case shutdown gets stuck)
os.Exit(1)
}()
s.Stop()
}
func enqueueAccounts(ctx context.Context, logger *logrus.Logger, pool *pgxpool.Pool, redisConn *redis.Client, queue rmq.Queue) {
now := float64(time.Now().UnixNano()/int64(time.Millisecond)) / 1000
ids := []int64{}
err := pool.BeginFunc(ctx, func(tx pgx.Tx) error {
stmt := `
WITH account AS (
SELECT id
FROM accounts
WHERE
last_checked_at + 5 < $1
ORDER BY last_enqueued_at
FOR UPDATE SKIP LOCKED
)
UPDATE accounts
SET last_enqueued_at = $1
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)
}
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),
}).Debug("enqueueing account batch")
for _, id := range ids {
payload := fmt.Sprintf("%d", id)
if redisConn.HGet(ctx, "locks:accounts", payload).Val() != "" {
continue
}
_ = queue.Publish(payload)
}
logger.WithFields(logrus.Fields{
"count": len(ids),
}).Debug("done enqueueing account batch")
}
func logErrors(errChan <-chan error) {
for err := range errChan {
log.Print("error: ", err)
}
}