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amqp.go
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amqp.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package writer
import (
"crypto/tls"
"fmt"
"strings"
"sync"
"time"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/text"
btls "github.com/Jeffail/benthos/lib/util/tls"
"github.com/streadway/amqp"
)
//------------------------------------------------------------------------------
// AMQPConfig contains configuration fields for the AMQP output type.
type AMQPConfig struct {
URL string `json:"url" yaml:"url"`
Exchange string `json:"exchange" yaml:"exchange"`
ExchangeType string `json:"exchange_type" yaml:"exchange_type"`
ExchangeDurable bool `json:"exchange_durable" yaml:"exchange_durable"`
BindingKey string `json:"key" yaml:"key"`
Persistent bool `json:"persistent" yaml:"persistent"`
Mandatory bool `json:"mandatory" yaml:"mandatory"`
Immediate bool `json:"immediate" yaml:"immediate"`
TLS btls.Config `json:"tls" yaml:"tls"`
}
// NewAMQPConfig creates a new AMQPConfig with default values.
func NewAMQPConfig() AMQPConfig {
return AMQPConfig{
URL: "amqp://guest:guest@localhost:5672/",
Exchange: "benthos-exchange",
ExchangeType: "direct",
ExchangeDurable: true,
BindingKey: "benthos-key",
Persistent: false,
Mandatory: false,
Immediate: false,
TLS: btls.NewConfig(),
}
}
//------------------------------------------------------------------------------
// AMQP is an output type that serves AMQP messages.
type AMQP struct {
key *text.InterpolatedString
log log.Modular
stats metrics.Type
conf AMQPConfig
tlsConf *tls.Config
conn *amqp.Connection
amqpChan *amqp.Channel
confirmChan <-chan amqp.Confirmation
returnChan <-chan amqp.Return
deliveryMode uint8
connLock sync.RWMutex
}
// NewAMQP creates a new AMQP writer type.
func NewAMQP(conf AMQPConfig, log log.Modular, stats metrics.Type) (*AMQP, error) {
a := AMQP{
key: text.NewInterpolatedString(conf.BindingKey),
log: log.NewModule(".output.amqp"),
stats: stats,
conf: conf,
deliveryMode: amqp.Transient,
}
if conf.Persistent {
a.deliveryMode = amqp.Persistent
}
if conf.TLS.Enabled {
var err error
if a.tlsConf, err = conf.TLS.Get(); err != nil {
return nil, err
}
}
return &a, nil
}
//------------------------------------------------------------------------------
// Connect establishes a connection to an AMQP server.
func (a *AMQP) Connect() error {
a.connLock.Lock()
defer a.connLock.Unlock()
var conn *amqp.Connection
var err error
if a.conf.TLS.Enabled {
conn, err = amqp.DialTLS(a.conf.URL, a.tlsConf)
if err != nil {
return fmt.Errorf("amqp failed to connect: %v", err)
}
} else {
conn, err = amqp.Dial(a.conf.URL)
if err != nil {
return fmt.Errorf("amqp failed to connect: %v", err)
}
}
var amqpChan *amqp.Channel
if amqpChan, err = conn.Channel(); err != nil {
conn.Close()
return fmt.Errorf("amqp failed to create channel: %v", err)
}
if err = amqpChan.ExchangeDeclare(
a.conf.Exchange, // name of the exchange
a.conf.ExchangeType, // type
a.conf.ExchangeDurable, // durable
false, // delete when complete
false, // internal
false, // noWait
nil, // arguments
); err != nil {
conn.Close()
return fmt.Errorf("amqp failed to declare exchange: %v", err)
}
if err = amqpChan.Confirm(false); err != nil {
conn.Close()
return fmt.Errorf("amqp channel could not be put into confirm mode: %v", err)
}
a.conn = conn
a.amqpChan = amqpChan
a.confirmChan = amqpChan.NotifyPublish(make(chan amqp.Confirmation, 1))
if a.conf.Mandatory || a.conf.Immediate {
a.returnChan = amqpChan.NotifyReturn(make(chan amqp.Return, 1))
}
a.log.Infof("Sending AMQP messages to URL: %s\n", a.conf.URL)
return nil
}
// disconnect safely closes a connection to an AMQP server.
func (a *AMQP) disconnect() error {
a.connLock.Lock()
defer a.connLock.Unlock()
if a.amqpChan != nil {
a.amqpChan = nil
}
if a.conn != nil {
if err := a.conn.Close(); err != nil {
return fmt.Errorf("AMQP connection close error: %s", err)
}
a.conn = nil
}
return nil
}
//------------------------------------------------------------------------------
// Write will attempt to write a message over AMQP, wait for acknowledgement,
// and returns an error if applicable.
func (a *AMQP) Write(msg types.Message) error {
a.connLock.RLock()
conn := a.conn
amqpChan := a.amqpChan
confirmChan := a.confirmChan
returnChan := a.returnChan
a.connLock.RUnlock()
if conn == nil {
return types.ErrNotConnected
}
bindingKey := strings.Replace(a.key.Get(msg), "/", ".", -1)
return msg.Iter(func(i int, p types.Part) error {
headers := amqp.Table{}
p.Metadata().Iter(func(k, v string) error {
headers[strings.Replace(k, "_", "-", -1)] = v
return nil
})
err := amqpChan.Publish(
a.conf.Exchange, // publish to an exchange
bindingKey, // routing to 0 or more queues
a.conf.Mandatory, // mandatory
a.conf.Immediate, // immediate
amqp.Publishing{
Headers: headers,
ContentType: "application/octet-stream",
ContentEncoding: "",
Body: p.Get(),
DeliveryMode: a.deliveryMode, // 1=non-persistent, 2=persistent
Priority: 0, // 0-9
// a bunch of application/implementation-specific fields
},
)
if err != nil {
a.disconnect()
return types.ErrNotConnected
}
select {
case confirm, open := <-confirmChan:
if !open {
return types.ErrNotConnected
}
if !confirm.Ack {
return types.ErrNoAck
}
case _, open := <-returnChan:
if !open {
return fmt.Errorf("acknowledgement not supported, ensure server supports immediate and mandatory flags")
}
return types.ErrNoAck
}
return nil
})
}
// CloseAsync shuts down the AMQP output and stops processing messages.
func (a *AMQP) CloseAsync() {
a.disconnect()
}
// WaitForClose blocks until the AMQP output has closed down.
func (a *AMQP) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------