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queue.go
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/
queue.go
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/*
* Copyright (c) 2023. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package jetstream
import (
"context"
"fmt"
"net/url"
"time"
"github.com/nats-io/nats.go"
"github.com/nats-io/nats.go/jetstream"
"go.uber.org/zap"
"google.golang.org/protobuf/proto"
"github.com/pydio/cells/v4/common/broker"
"github.com/pydio/cells/v4/common/crypto"
"github.com/pydio/cells/v4/common/log"
"github.com/pydio/cells/v4/common/utils/queue"
)
var (
nc *nats.Conn
)
type streamOpener struct{}
func (s *streamOpener) OpenURL(ctx context.Context, u *url.URL) (queue.Queue, error) {
streamName := u.Query().Get("name")
if streamName == "" {
return nil, fmt.Errorf("missing query parameter 'name' for opening queue")
}
return NewNatsQueue(ctx, u, streamName)
}
func init() {
queue.DefaultURLMux().Register("nats", &streamOpener{})
}
type Queue struct {
rootCtx context.Context
streamName string
js jetstream.JetStream
}
// Push serializes json-encoded context metadata and proto-encoded event together
func (q *Queue) Push(ctx context.Context, event proto.Message) error {
data := queue.EncodeProtoWithContext(ctx, event)
_, er := q.js.Publish(ctx, q.streamName+".msg", data)
return er
}
// PushRaw forwards a broker.Message to the queue
func (q *Queue) PushRaw(ctx context.Context, message broker.Message) error {
data := queue.EncodeBrokerMessage(message)
_, er := q.js.Publish(ctx, q.streamName+".msg", data)
return er
}
// Consume creates a jetstream Consumer with the current streamName
func (q *Queue) Consume(process func(...broker.Message)) error {
// Create a stream
s, er := q.js.CreateStream(q.rootCtx, jetstream.StreamConfig{
Name: q.streamName,
Subjects: []string{q.streamName + ".*"},
})
if er != nil {
return er
}
// Create durable consumer
c, er := s.CreateOrUpdateConsumer(q.rootCtx, jetstream.ConsumerConfig{
Durable: "CONS",
AckPolicy: jetstream.AckExplicitPolicy,
})
if er != nil {
return er
}
go func() {
cons, _ := c.Consume(func(msg jetstream.Msg) {
_ = msg.Ack()
if pm, e := queue.DecodeToBrokerMessage(msg.Data()); e == nil {
process(pm)
} else {
log.Logger(q.rootCtx).Error("[nats-queue] cannot consume pulled message correctly", zap.Error(e))
}
})
<-q.rootCtx.Done()
log.Logger(q.rootCtx).Debug("[nats-queue] Closing consume context now")
cons.Stop()
}()
return nil
}
func NewNatsQueue(ctx context.Context, u *url.URL, streamName string) (*Queue, error) {
if nc == nil {
tlsConfig, err := crypto.TLSConfigFromURL(u)
if err != nil {
return nil, err
}
opts := []nats.Option{
nats.Timeout(10 * time.Second),
}
if tlsConfig != nil {
opts = append(opts, nats.Secure(tlsConfig))
}
u.RawQuery = ""
if n, err := nats.Connect(u.String(), opts...); err == nil {
nc = n
} else {
return nil, err
}
}
js, er := jetstream.New(nc)
if er != nil {
return nil, er
}
q := &Queue{
rootCtx: ctx,
streamName: streamName,
js: js,
}
return q, nil
}