minio/cmd/notify-amqp.go
2017-02-20 12:05:21 -08:00

154 lines
3.5 KiB
Go

/*
* Minio Cloud Storage, (C) 2016 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 cmd
import (
"io/ioutil"
"net"
"github.com/Sirupsen/logrus"
"github.com/streadway/amqp"
)
// amqpNotify - represents logrus compatible AMQP hook.
// All fields represent AMQP configuration details.
type amqpNotify struct {
Enable bool `json:"enable"`
URL string `json:"url"`
Exchange string `json:"exchange"`
RoutingKey string `json:"routingKey"`
ExchangeType string `json:"exchangeType"`
Mandatory bool `json:"mandatory"`
Immediate bool `json:"immediate"`
Durable bool `json:"durable"`
Internal bool `json:"internal"`
NoWait bool `json:"noWait"`
AutoDeleted bool `json:"autoDeleted"`
}
type amqpConn struct {
params amqpNotify
*amqp.Connection
}
// dialAMQP - dials and returns an amqpConnection instance,
// for sending notifications. Returns error if amqp logger
// is not enabled.
func dialAMQP(amqpL amqpNotify) (amqpConn, error) {
if !amqpL.Enable {
return amqpConn{}, errNotifyNotEnabled
}
conn, err := amqp.Dial(amqpL.URL)
if err != nil {
return amqpConn{}, err
}
return amqpConn{Connection: conn, params: amqpL}, nil
}
func newAMQPNotify(accountID string) (*logrus.Logger, error) {
amqpL := serverConfig.Notify.GetAMQPByID(accountID)
// Connect to amqp server.
amqpC, err := dialAMQP(amqpL)
if err != nil {
return nil, err
}
amqpLog := logrus.New()
// Disable writing to console.
amqpLog.Out = ioutil.Discard
// Add a amqp hook.
amqpLog.Hooks.Add(amqpC)
// Set default JSON formatter.
amqpLog.Formatter = new(logrus.JSONFormatter)
// Successfully enabled all AMQPs.
return amqpLog, nil
}
// Fire is called when an event should be sent to the message broker.
func (q amqpConn) Fire(entry *logrus.Entry) error {
ch, err := q.Connection.Channel()
if err != nil {
// Any other error other than connection closed, return.
isClosedErr := false
if neterr, ok := err.(*net.OpError); ok &&
neterr.Err.Error() == "use of closed network connection" {
isClosedErr = true
} else if err == amqp.ErrClosed {
isClosedErr = true
}
if !isClosedErr {
return err
}
// Attempt to connect again.
var conn *amqp.Connection
conn, err = amqp.Dial(q.params.URL)
if err != nil {
return err
}
ch, err = conn.Channel()
if err != nil {
return err
}
}
defer ch.Close()
err = ch.ExchangeDeclare(
q.params.Exchange,
q.params.ExchangeType,
q.params.Durable,
q.params.AutoDeleted,
q.params.Internal,
q.params.NoWait,
nil,
)
if err != nil {
return err
}
body, err := entry.String()
if err != nil {
return err
}
err = ch.Publish(
q.params.Exchange,
q.params.RoutingKey,
q.params.Mandatory,
q.params.Immediate,
amqp.Publishing{
ContentType: "application/json",
Body: []byte(body),
})
if err != nil {
return err
}
return nil
}
// Levels is available logging levels.
func (q amqpConn) Levels() []logrus.Level {
return []logrus.Level{
logrus.InfoLevel,
}
}