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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package target
import (
"context"
"crypto/tls"
"encoding/json"
"errors"
"net/url"
"os"
"path/filepath"
"github.com/nsqio/go-nsq"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
)
// NSQ constants
const (
NSQAddress = "nsqd_address"
NSQTopic = "topic"
NSQTLS = "tls"
NSQTLSSkipVerify = "tls_skip_verify"
NSQQueueDir = "queue_dir"
NSQQueueLimit = "queue_limit"
EnvNSQEnable = "MINIO_NOTIFY_NSQ_ENABLE"
EnvNSQAddress = "MINIO_NOTIFY_NSQ_NSQD_ADDRESS"
EnvNSQTopic = "MINIO_NOTIFY_NSQ_TOPIC"
EnvNSQTLS = "MINIO_NOTIFY_NSQ_TLS"
EnvNSQTLSSkipVerify = "MINIO_NOTIFY_NSQ_TLS_SKIP_VERIFY"
EnvNSQQueueDir = "MINIO_NOTIFY_NSQ_QUEUE_DIR"
EnvNSQQueueLimit = "MINIO_NOTIFY_NSQ_QUEUE_LIMIT"
)
// NSQArgs - NSQ target arguments.
type NSQArgs struct {
Enable bool `json:"enable"`
NSQDAddress xnet.Host `json:"nsqdAddress"`
Topic string `json:"topic"`
TLS struct {
Enable bool `json:"enable"`
SkipVerify bool `json:"skipVerify"`
} `json:"tls"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
}
// Validate NSQArgs fields
func (n NSQArgs) Validate() error {
if !n.Enable {
return nil
}
if n.NSQDAddress.IsEmpty() {
return errors.New("empty nsqdAddress")
}
if n.Topic == "" {
return errors.New("empty topic")
}
if n.QueueDir != "" {
if !filepath.IsAbs(n.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
return nil
}
// NSQTarget - NSQ target.
type NSQTarget struct {
id event.TargetID
args NSQArgs
producer *nsq.Producer
store Store
config *nsq.Config
loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
}
// ID - returns target ID.
func (target *NSQTarget) ID() event.TargetID {
return target.id
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *NSQTarget) HasQueueStore() bool {
return target.store != nil
}
// IsActive - Return true if target is up and active
func (target *NSQTarget) IsActive() (bool, error) {
if target.producer == nil {
producer, err := nsq.NewProducer(target.args.NSQDAddress.String(), target.config)
if err != nil {
return false, err
}
target.producer = producer
}
if err := target.producer.Ping(); err != nil {
// To treat "connection refused" errors as errNotConnected.
if IsConnRefusedErr(err) {
return false, errNotConnected
}
return false, err
}
return true, nil
}
// Save - saves the events to the store which will be replayed when the nsq connection is active.
func (target *NSQTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
_, err := target.IsActive()
if err != nil {
return err
}
return target.send(eventData)
}
// send - sends an event to the NSQ.
func (target *NSQTarget) send(eventData event.Event) error {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
if err != nil {
return err
}
return target.producer.Publish(target.args.Topic, data)
}
// Send - reads an event from store and sends it to NSQ.
func (target *NSQTarget) Send(eventKey string) error {
_, err := target.IsActive()
if err != nil {
return err
}
eventData, eErr := target.store.Get(eventKey)
if eErr != nil {
// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
// Such events will not exist and wouldve been already been sent successfully.
if os.IsNotExist(eErr) {
return nil
}
return eErr
}
if err := target.send(eventData); err != nil {
return err
}
// Delete the event from store.
return target.store.Del(eventKey)
}
// Close - closes underneath connections to NSQD server.
func (target *NSQTarget) Close() (err error) {
if target.producer != nil {
// this blocks until complete:
target.producer.Stop()
}
return nil
}
// NewNSQTarget - creates new NSQ target.
func NewNSQTarget(id string, args NSQArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), test bool) (*NSQTarget, error) {
config := nsq.NewConfig()
if args.TLS.Enable {
config.TlsV1 = true
config.TlsConfig = &tls.Config{
InsecureSkipVerify: args.TLS.SkipVerify,
}
}
var store Store
target := &NSQTarget{
id: event.TargetID{ID: id, Name: "nsq"},
args: args,
config: config,
loggerOnce: loggerOnce,
}
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-nsq-"+id)
store = NewQueueStore(queueDir, args.QueueLimit)
if oErr := store.Open(); oErr != nil {
target.loggerOnce(context.Background(), oErr, target.ID())
return target, oErr
}
target.store = store
}
producer, err := nsq.NewProducer(args.NSQDAddress.String(), config)
if err != nil {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
target.producer = producer
if err := target.producer.Ping(); err != nil {
// To treat "connection refused" errors as errNotConnected.
if target.store == nil || !(IsConnRefusedErr(err) || IsConnResetErr(err)) {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
}
if target.store != nil && !test {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, doneCh, target.loggerOnce, target.ID())
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, doneCh, target.loggerOnce)
}
return target, nil
}