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Copy pathamqp.go
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314 lines (269 loc) · 8.24 KB
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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"
"encoding/json"
"errors"
"net"
"net/url"
"os"
"path/filepath"
"sync"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
"github.com/streadway/amqp"
)
// AMQPArgs - AMQP target arguments.
type AMQPArgs struct {
Enable bool `json:"enable"`
URL xnet.URL `json:"url"`
Exchange string `json:"exchange"`
RoutingKey string `json:"routingKey"`
ExchangeType string `json:"exchangeType"`
DeliveryMode uint8 `json:"deliveryMode"`
Mandatory bool `json:"mandatory"`
Immediate bool `json:"immediate"`
Durable bool `json:"durable"`
Internal bool `json:"internal"`
NoWait bool `json:"noWait"`
AutoDeleted bool `json:"autoDeleted"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
}
//lint:file-ignore ST1003 We cannot change these exported names.
// AMQP input constants.
const (
AmqpQueueDir = "queue_dir"
AmqpQueueLimit = "queue_limit"
AmqpURL = "url"
AmqpExchange = "exchange"
AmqpRoutingKey = "routing_key"
AmqpExchangeType = "exchange_type"
AmqpDeliveryMode = "delivery_mode"
AmqpMandatory = "mandatory"
AmqpImmediate = "immediate"
AmqpDurable = "durable"
AmqpInternal = "internal"
AmqpNoWait = "no_wait"
AmqpAutoDeleted = "auto_deleted"
AmqpArguments = "arguments"
AmqpPublishingHeaders = "publishing_headers"
EnvAMQPEnable = "MINIO_NOTIFY_AMQP_ENABLE"
EnvAMQPURL = "MINIO_NOTIFY_AMQP_URL"
EnvAMQPExchange = "MINIO_NOTIFY_AMQP_EXCHANGE"
EnvAMQPRoutingKey = "MINIO_NOTIFY_AMQP_ROUTING_KEY"
EnvAMQPExchangeType = "MINIO_NOTIFY_AMQP_EXCHANGE_TYPE"
EnvAMQPDeliveryMode = "MINIO_NOTIFY_AMQP_DELIVERY_MODE"
EnvAMQPMandatory = "MINIO_NOTIFY_AMQP_MANDATORY"
EnvAMQPImmediate = "MINIO_NOTIFY_AMQP_IMMEDIATE"
EnvAMQPDurable = "MINIO_NOTIFY_AMQP_DURABLE"
EnvAMQPInternal = "MINIO_NOTIFY_AMQP_INTERNAL"
EnvAMQPNoWait = "MINIO_NOTIFY_AMQP_NO_WAIT"
EnvAMQPAutoDeleted = "MINIO_NOTIFY_AMQP_AUTO_DELETED"
EnvAMQPArguments = "MINIO_NOTIFY_AMQP_ARGUMENTS"
EnvAMQPPublishingHeaders = "MINIO_NOTIFY_AMQP_PUBLISHING_HEADERS"
EnvAMQPQueueDir = "MINIO_NOTIFY_AMQP_QUEUE_DIR"
EnvAMQPQueueLimit = "MINIO_NOTIFY_AMQP_QUEUE_LIMIT"
)
// Validate AMQP arguments
func (a *AMQPArgs) Validate() error {
if !a.Enable {
return nil
}
if _, err := amqp.ParseURI(a.URL.String()); err != nil {
return err
}
if a.QueueDir != "" {
if !filepath.IsAbs(a.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
return nil
}
// AMQPTarget - AMQP target
type AMQPTarget struct {
id event.TargetID
args AMQPArgs
conn *amqp.Connection
connMutex sync.Mutex
store Store
loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
}
// ID - returns TargetID.
func (target *AMQPTarget) ID() event.TargetID {
return target.id
}
// IsActive - Return true if target is up and active
func (target *AMQPTarget) IsActive() (bool, error) {
ch, err := target.channel()
if err != nil {
return false, err
}
defer func() {
ch.Close()
}()
return true, nil
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *AMQPTarget) HasQueueStore() bool {
return target.store != nil
}
func (target *AMQPTarget) channel() (*amqp.Channel, error) {
var err error
var conn *amqp.Connection
var ch *amqp.Channel
isAMQPClosedErr := func(err error) bool {
if err == amqp.ErrClosed {
return true
}
if nerr, ok := err.(*net.OpError); ok {
return (nerr.Err.Error() == "use of closed network connection")
}
return false
}
target.connMutex.Lock()
defer target.connMutex.Unlock()
if target.conn != nil {
ch, err = target.conn.Channel()
if err == nil {
return ch, nil
}
if !isAMQPClosedErr(err) {
return nil, err
}
}
conn, err = amqp.Dial(target.args.URL.String())
if err != nil {
if IsConnRefusedErr(err) {
return nil, errNotConnected
}
return nil, err
}
ch, err = conn.Channel()
if err != nil {
return nil, err
}
target.conn = conn
return ch, nil
}
// send - sends an event to the AMQP.
func (target *AMQPTarget) send(eventData event.Event, ch *amqp.Channel) 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
}
if err = ch.ExchangeDeclare(target.args.Exchange, target.args.ExchangeType, target.args.Durable,
target.args.AutoDeleted, target.args.Internal, target.args.NoWait, nil); err != nil {
return err
}
if err := ch.Publish(target.args.Exchange, target.args.RoutingKey, target.args.Mandatory,
target.args.Immediate, amqp.Publishing{
ContentType: "application/json",
DeliveryMode: target.args.DeliveryMode,
Body: data,
}); err != nil {
return err
}
return nil
}
// Save - saves the events to the store which will be replayed when the amqp connection is active.
func (target *AMQPTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
ch, err := target.channel()
if err != nil {
return err
}
defer func() {
cErr := ch.Close()
target.loggerOnce(context.Background(), cErr, target.ID())
}()
return target.send(eventData, ch)
}
// Send - sends event to AMQP.
func (target *AMQPTarget) Send(eventKey string) error {
ch, err := target.channel()
if err != nil {
return err
}
defer func() {
cErr := ch.Close()
target.loggerOnce(context.Background(), cErr, target.ID())
}()
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, ch); err != nil {
return err
}
// Delete the event from store.
return target.store.Del(eventKey)
}
// Close - does nothing and available for interface compatibility.
func (target *AMQPTarget) Close() error {
if target.conn != nil {
return target.conn.Close()
}
return nil
}
// NewAMQPTarget - creates new AMQP target.
func NewAMQPTarget(id string, args AMQPArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{}), test bool) (*AMQPTarget, error) {
var conn *amqp.Connection
var err error
var store Store
target := &AMQPTarget{
id: event.TargetID{ID: id, Name: "amqp"},
args: args,
loggerOnce: loggerOnce,
}
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-amqp-"+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
}
conn, err = amqp.Dial(args.URL.String())
if err != nil {
if store == nil || !(IsConnRefusedErr(err) || IsConnResetErr(err)) {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
}
target.conn = conn
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
}