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rabbitmq.go
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rabbitmq.go
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package rabbitmq
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"os"
"sync"
"time"
lru "github.com/hashicorp/golang-lru/v2"
"github.com/jackc/puddle/v2"
amqp "github.com/rabbitmq/amqp091-go"
"github.com/rs/zerolog"
"github.com/hatchet-dev/hatchet/internal/encryption"
"github.com/hatchet-dev/hatchet/internal/logger"
"github.com/hatchet-dev/hatchet/internal/msgqueue"
)
const MAX_RETRY_COUNT = 15
const RETRY_INTERVAL = 2 * time.Second
// session composes an amqp.Connection with an amqp.Channel
type session struct {
*amqp.Connection
*amqp.Channel
}
type msgWithQueue struct {
*msgqueue.Message
q msgqueue.Queue
}
// MessageQueueImpl implements MessageQueue interface using AMQP.
type MessageQueueImpl struct {
ctx context.Context
sessions chan chan session
msgs chan *msgWithQueue
identity string
l *zerolog.Logger
ready bool
// lru cache for tenant ids
tenantIdCache *lru.Cache[string, bool]
}
func (t *MessageQueueImpl) IsReady() bool {
return t.ready
}
type MessageQueueImplOpt func(*MessageQueueImplOpts)
type MessageQueueImplOpts struct {
l *zerolog.Logger
url string
}
func defaultMessageQueueImplOpts() *MessageQueueImplOpts {
l := logger.NewDefaultLogger("rabbitmq")
return &MessageQueueImplOpts{
l: &l,
}
}
func WithLogger(l *zerolog.Logger) MessageQueueImplOpt {
return func(opts *MessageQueueImplOpts) {
opts.l = l
}
}
func WithURL(url string) MessageQueueImplOpt {
return func(opts *MessageQueueImplOpts) {
opts.url = url
}
}
// New creates a new MessageQueueImpl.
func New(fs ...MessageQueueImplOpt) (func() error, *MessageQueueImpl) {
ctx, cancel := context.WithCancel(context.Background())
opts := defaultMessageQueueImplOpts()
for _, f := range fs {
f(opts)
}
newLogger := opts.l.With().Str("service", "events-controller").Logger()
opts.l = &newLogger
t := &MessageQueueImpl{
ctx: ctx,
identity: identity(),
l: opts.l,
}
constructor := func(context.Context) (*amqp.Connection, error) {
conn, err := amqp.Dial(opts.url)
if err != nil {
opts.l.Error().Msgf("cannot (re)dial: %v: %q", err, opts.url)
return nil, err
}
return conn, nil
}
destructor := func(conn *amqp.Connection) {
if !conn.IsClosed() {
err := conn.Close()
if err != nil {
opts.l.Error().Msgf("error closing connection: %v", err)
}
}
}
maxPoolSize := int32(10)
pool, err := puddle.NewPool(&puddle.Config[*amqp.Connection]{Constructor: constructor, Destructor: destructor, MaxSize: maxPoolSize})
if err != nil {
t.l.Error().Err(err).Msg("cannot create connection pool")
cancel()
return nil, nil
}
t.sessions = t.redial(ctx, opts.l, pool)
t.msgs = make(chan *msgWithQueue)
// create a new lru cache for tenant ids
t.tenantIdCache, _ = lru.New[string, bool](2000) // nolint: errcheck - this only returns an error if the size is less than 0
// init the queues in a blocking fashion
sub := <-<-t.sessions
if _, err := t.initQueue(sub, msgqueue.EVENT_PROCESSING_QUEUE); err != nil {
t.l.Debug().Msgf("error initializing queue: %v", err)
cancel()
return nil, nil
}
if _, err := t.initQueue(sub, msgqueue.JOB_PROCESSING_QUEUE); err != nil {
t.l.Debug().Msgf("error initializing queue: %v", err)
cancel()
return nil, nil
}
if _, err := t.initQueue(sub, msgqueue.WORKFLOW_PROCESSING_QUEUE); err != nil {
t.l.Debug().Msgf("error initializing queue: %v", err)
cancel()
return nil, nil
}
if _, err := t.initQueue(sub, msgqueue.SCHEDULING_QUEUE); err != nil {
t.l.Debug().Msgf("error initializing queue: %v", err)
cancel()
return nil, nil
}
// create publisher go func
cleanup1 := t.startPublishing()
cleanup := func() error {
cancel()
if err := cleanup1(); err != nil {
return fmt.Errorf("error cleaning up rabbitmq publisher: %w", err)
}
pool.Close()
return nil
}
return cleanup, t
}
// AddMessage adds a msg to the queue.
func (t *MessageQueueImpl) AddMessage(ctx context.Context, q msgqueue.Queue, msg *msgqueue.Message) error {
t.msgs <- &msgWithQueue{
Message: msg,
q: q,
}
return nil
}
// Subscribe subscribes to the msg queue.
func (t *MessageQueueImpl) Subscribe(
q msgqueue.Queue,
preAck msgqueue.AckHook,
postAck msgqueue.AckHook,
) (func() error, error) {
t.l.Debug().Msgf("subscribing to queue: %s", q.Name())
cleanup := t.subscribe(t.identity, q, t.sessions, preAck, postAck)
return cleanup, nil
}
func (t *MessageQueueImpl) RegisterTenant(ctx context.Context, tenantId string) error {
// create a new fanout exchange for the tenant
sub := <-<-t.sessions
t.l.Debug().Msgf("registering tenant exchange: %s", tenantId)
// create a fanout exchange for the tenant. each consumer of the fanout exchange will get notified
// with the tenant events.
err := sub.ExchangeDeclare(
tenantId,
"fanout",
true, // durable
false, // auto-deleted
false, // not internal, accepts publishings
false, // no-wait
nil, // arguments
)
if err != nil {
t.l.Error().Msgf("cannot declare exchange: %q, %v", tenantId, err)
return err
}
t.tenantIdCache.Add(tenantId, true)
return nil
}
func (t *MessageQueueImpl) initQueue(sub session, q msgqueue.Queue) (string, error) {
args := make(amqp.Table)
name := q.Name()
if q.FanoutExchangeKey() != "" {
suffix, err := encryption.GenerateRandomBytes(4)
if err != nil {
t.l.Error().Msgf("error generating random bytes: %v", err)
return "", err
}
name = fmt.Sprintf("%s-%s", q.Name(), suffix)
}
if q.DLX() != "" {
args["x-dead-letter-exchange"] = ""
args["x-dead-letter-routing-key"] = q.DLX()
args["x-consumer-timeout"] = 5000 // 5 seconds
dlqArgs := make(amqp.Table)
dlqArgs["x-dead-letter-exchange"] = ""
dlqArgs["x-dead-letter-routing-key"] = name
dlqArgs["x-message-ttl"] = 5000 // 5 seconds
// declare the dead letter queue
if _, err := sub.QueueDeclare(q.DLX(), true, false, false, false, dlqArgs); err != nil {
t.l.Error().Msgf("cannot declare dead letter exchange/queue: %q, %v", q.DLX(), err)
return "", err
}
}
if _, err := sub.QueueDeclare(name, q.Durable(), q.AutoDeleted(), q.Exclusive(), false, args); err != nil {
t.l.Error().Msgf("cannot declare queue: %q, %v", name, err)
return "", err
}
// if the queue has a subscriber key, bind it to the fanout exchange
if q.FanoutExchangeKey() != "" {
t.l.Debug().Msgf("binding queue: %s to exchange: %s", name, q.FanoutExchangeKey())
if err := sub.QueueBind(name, "", q.FanoutExchangeKey(), false, nil); err != nil {
t.l.Error().Msgf("cannot bind queue: %q, %v", name, err)
return "", err
}
}
return name, nil
}
func (t *MessageQueueImpl) startPublishing() func() error {
ctx, cancel := context.WithCancel(t.ctx)
cleanup := func() error {
cancel()
return nil
}
go func() {
for session := range t.sessions {
pub := <-session
conn := pub.Connection
t.l.Debug().Msgf("starting publisher: %s", conn.LocalAddr().String())
for {
if pub.Channel.IsClosed() {
break
} else if conn.IsClosed() {
t.l.Error().Msgf("connection is closed, reconnecting")
break
}
select {
case <-ctx.Done():
break
case msg := <-t.msgs:
go func(msg *msgWithQueue) {
body, err := json.Marshal(msg)
if err != nil {
t.l.Error().Msgf("error marshaling msg queue: %v", err)
return
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
t.l.Debug().Msgf("publishing msg %s to queue %s", msg.ID, msg.q.Name())
err = pub.PublishWithContext(ctx, "", msg.q.Name(), false, false, amqp.Publishing{
Body: body,
})
// retry failed delivery on the next session
if err != nil {
t.msgs <- msg
return
}
// if this is a tenant msg, publish to the tenant exchange
if msg.TenantID() != "" {
// determine if the tenant exchange exists
if _, ok := t.tenantIdCache.Get(msg.TenantID()); !ok {
// register the tenant exchange
err = t.RegisterTenant(ctx, msg.TenantID())
if err != nil {
t.l.Error().Msgf("error registering tenant exchange: %v", err)
return
}
}
t.l.Debug().Msgf("publishing tenant msg %s to exchange %s", msg.ID, msg.TenantID())
err = pub.PublishWithContext(ctx, msg.TenantID(), "", false, false, amqp.Publishing{
Body: body,
})
if err != nil {
t.l.Error().Msgf("error publishing tenant msg: %v", err)
return
}
}
t.l.Debug().Msgf("published msg %s to queue %s", msg.ID, msg.q.Name())
}(msg)
}
}
if !pub.Channel.IsClosed() {
err := pub.Channel.Close()
if err != nil {
t.l.Error().Msgf("cannot close channel: %s, %v", conn.LocalAddr().String(), err)
}
}
}
}()
return cleanup
}
func (t *MessageQueueImpl) subscribe(
subId string,
q msgqueue.Queue,
sessions chan chan session,
preAck msgqueue.AckHook,
postAck msgqueue.AckHook,
) func() error {
ctx, cancel := context.WithCancel(context.Background())
sessionCount := 0
wg := sync.WaitGroup{}
go func() {
for session := range sessions {
sessionCount++
sub := <-session
sessionWg := sync.WaitGroup{}
conn := sub.Connection
t.l.Debug().Msgf("starting subscriber %s on: %s", subId, conn.LocalAddr().String())
// we initialize the queue here because exclusive queues are bound to the session/connection. however, it's not clear
// if the exclusive queue will be available to the next session.
queueName, err := t.initQueue(sub, q)
if err != nil {
return
}
// We'd like to limit to 1k TPS per engine. The max channels on an instance is 10.
err = sub.Qos(100, 0, false)
if err != nil {
t.l.Error().Msgf("cannot set qos: %v", err)
return
}
deliveries, err := sub.Consume(queueName, subId, false, q.Exclusive(), false, false, nil)
if err != nil {
t.l.Error().Msgf("cannot consume from: %s, %v", queueName, err)
return
}
closeChannel := func() {
sessionWg.Wait()
if !sub.Channel.IsClosed() {
err = sub.Channel.Close()
if err != nil {
t.l.Error().Msgf("cannot close channel: %s, %v", conn.LocalAddr().String(), err)
}
}
}
inner:
for {
select {
case <-ctx.Done():
closeChannel()
return
case rabbitMsg, ok := <-deliveries:
if !ok {
t.l.Info().Msg("deliveries channel closed")
break inner
}
wg.Add(1)
sessionWg.Add(1)
go func(rabbitMsg amqp.Delivery) {
defer wg.Done()
defer sessionWg.Done()
msg := &msgWithQueue{}
if len(rabbitMsg.Body) == 0 {
t.l.Error().Msgf("empty message body for message: %s", rabbitMsg.MessageId)
// reject this message
if err := rabbitMsg.Reject(false); err != nil {
t.l.Error().Msgf("error rejecting message: %v", err)
}
return
}
if err := json.Unmarshal(rabbitMsg.Body, msg); err != nil {
t.l.Error().Msgf("error unmarshaling message: %v", err)
// reject this message
if err := rabbitMsg.Reject(false); err != nil {
t.l.Error().Msgf("error rejecting message: %v", err)
}
return
}
// determine if we've hit the max number of retries
xDeath, exists := rabbitMsg.Headers["x-death"].([]interface{})
if exists {
// message was rejected before
deathCount := xDeath[0].(amqp.Table)["count"].(int64)
t.l.Debug().Msgf("message %s has been rejected %d times", msg.ID, deathCount)
if deathCount > int64(msg.Retries) {
t.l.Debug().Msgf("message %s has been rejected %d times, not requeuing", msg.ID, deathCount)
// acknowledge so it's removed from the queue
if err := rabbitMsg.Ack(false); err != nil {
t.l.Error().Msgf("error acknowledging message: %v", err)
}
return
}
}
t.l.Debug().Msgf("(session: %d) got msg: %v", sessionCount, msg.ID)
if err := preAck(msg.Message); err != nil {
t.l.Error().Msgf("error in pre-ack: %v", err)
// nack the message
if err := rabbitMsg.Reject(false); err != nil {
t.l.Error().Msgf("error rejecting message: %v", err)
}
return
}
if err := sub.Ack(rabbitMsg.DeliveryTag, false); err != nil {
t.l.Error().Msgf("error acknowledging message: %v", err)
return
}
if err := postAck(msg.Message); err != nil {
t.l.Error().Msgf("error in post-ack: %v", err)
return
}
}(rabbitMsg)
}
}
go closeChannel()
}
}()
cleanup := func() error {
cancel()
t.l.Debug().Msgf("shutting down subscriber: %s", subId)
wg.Wait()
t.l.Debug().Msgf("successfully shut down subscriber: %s", subId)
return nil
}
return cleanup
}
// redial continually connects to the URL, exiting the program when no longer possible
func (t *MessageQueueImpl) redial(ctx context.Context, l *zerolog.Logger, pool *puddle.Pool[*amqp.Connection]) chan chan session {
sessions := make(chan chan session)
go func() {
sess := make(chan session)
defer close(sessions)
for {
select {
case sessions <- sess:
case <-ctx.Done():
l.Info().Msgf("shutting down session factory")
return
}
var newSession session
var err error
for i := 0; i < MAX_RETRY_COUNT; i++ {
newSession, err = getSession(ctx, l, pool)
if err == nil {
if i > 0 {
l.Info().Msgf("re-established session after %d attempts", i)
}
break
}
l.Error().Msgf("error getting session (attempt %d): %v", i+1, err)
time.Sleep(RETRY_INTERVAL)
}
if err != nil {
l.Error().Msgf("failed to get session after %d attempts", MAX_RETRY_COUNT)
t.ready = false
return
}
t.ready = true
ch := newSession.Connection.NotifyClose(make(chan *amqp.Error, 1))
go func() {
select {
case <-ctx.Done():
return
case <-ch:
t.ready = false
}
}()
select {
case sess <- newSession:
case <-ctx.Done():
l.Info().Msgf("shutting down new session")
return
}
}
}()
return sessions
}
// identity returns the same host/process unique string for the lifetime of
// this process so that subscriber reconnections reuse the same queue name.
func identity() string {
hostname, err := os.Hostname()
h := sha256.New()
_, _ = fmt.Fprint(h, hostname)
_, _ = fmt.Fprint(h, err)
_, _ = fmt.Fprint(h, os.Getpid())
return fmt.Sprintf("%x", h.Sum(nil))
}
func getSession(ctx context.Context, l *zerolog.Logger, pool *puddle.Pool[*amqp.Connection]) (session, error) {
connFromPool, err := pool.Acquire(ctx)
if err != nil {
l.Error().Msgf("cannot acquire connection: %v", err)
return session{}, err
}
conn := connFromPool.Value()
ch, err := conn.Channel()
if err != nil {
connFromPool.Destroy()
l.Error().Msgf("cannot create channel: %v", err)
return session{}, err
}
connFromPool.Release()
return session{
Channel: ch,
Connection: conn,
}, nil
}