forked from benthosdev/benthos
/
amqp_0_9.go
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/
amqp_0_9.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 reader
import (
"context"
"crypto/tls"
"fmt"
"sync"
"time"
"github.com/ollystephens/benthos/v3/lib/log"
"github.com/ollystephens/benthos/v3/lib/message"
"github.com/ollystephens/benthos/v3/lib/message/batch"
"github.com/ollystephens/benthos/v3/lib/metrics"
"github.com/ollystephens/benthos/v3/lib/types"
btls "github.com/ollystephens/benthos/v3/lib/util/tls"
"github.com/streadway/amqp"
)
//------------------------------------------------------------------------------
// AMQP09QueueDeclareConfig contains fields indicating whether the target AMQP09
// queue needs to be declared and bound to an exchange, as well as any fields
// specifying how to accomplish that.
type AMQP09QueueDeclareConfig struct {
Enabled bool `json:"enabled" yaml:"enabled"`
Durable bool `json:"durable" yaml:"durable"`
}
// AMQP09BindingConfig contains fields describing a queue binding to be
// declared.
type AMQP09BindingConfig struct {
Exchange string `json:"exchange" yaml:"exchange"`
RoutingKey string `json:"key" yaml:"key"`
}
// AMQP09Config contains configuration for the AMQP09 input type.
type AMQP09Config struct {
URL string `json:"url" yaml:"url"`
Queue string `json:"queue" yaml:"queue"`
QueueDeclare AMQP09QueueDeclareConfig `json:"queue_declare" yaml:"queue_declare"`
BindingsDeclare []AMQP09BindingConfig `json:"bindings_declare" yaml:"bindings_declare"`
ConsumerTag string `json:"consumer_tag" yaml:"consumer_tag"`
PrefetchCount int `json:"prefetch_count" yaml:"prefetch_count"`
PrefetchSize int `json:"prefetch_size" yaml:"prefetch_size"`
Batching batch.PolicyConfig `json:"batching" yaml:"batching"`
TLS btls.Config `json:"tls" yaml:"tls"`
}
// NewAMQP09Config creates a new AMQP09Config with default values.
func NewAMQP09Config() AMQP09Config {
batching := batch.NewPolicyConfig()
batching.Count = 1
return AMQP09Config{
URL: "amqp://guest:guest@localhost:5672/",
Queue: "benthos-queue",
QueueDeclare: AMQP09QueueDeclareConfig{
Enabled: false,
Durable: true,
},
ConsumerTag: "benthos-consumer",
PrefetchCount: 10,
PrefetchSize: 0,
TLS: btls.NewConfig(),
Batching: batching,
BindingsDeclare: []AMQP09BindingConfig{},
}
}
//------------------------------------------------------------------------------
// AMQP09 is an input type that reads messages via the AMQP09 0.9 protocol.
type AMQP09 struct {
conn *amqp.Connection
amqpChan *amqp.Channel
consumerChan <-chan amqp.Delivery
ackTag uint64
tlsConf *tls.Config
conf AMQP09Config
stats metrics.Type
log log.Modular
m sync.RWMutex
}
// NewAMQP09 creates a new AMQP09 input type.
func NewAMQP09(conf AMQP09Config, log log.Modular, stats metrics.Type) (*AMQP09, error) {
a := AMQP09{
conf: conf,
stats: stats,
log: log,
}
if conf.TLS.Enabled {
var err error
if a.tlsConf, err = conf.TLS.Get(); err != nil {
return nil, err
}
}
return &a, nil
}
//------------------------------------------------------------------------------
// ConnectWithContext establishes a connection to an AMQP09 server.
func (a *AMQP09) ConnectWithContext(ctx context.Context) (err error) {
a.m.Lock()
defer a.m.Unlock()
if a.conn != nil {
return nil
}
var conn *amqp.Connection
var amqpChan *amqp.Channel
var consumerChan <-chan amqp.Delivery
if a.conf.TLS.Enabled {
conn, err = amqp.DialTLS(a.conf.URL, a.tlsConf)
if err != nil {
return fmt.Errorf("AMQP 0.9 Connect: %s", err)
}
} else {
conn, err = amqp.Dial(a.conf.URL)
if err != nil {
return fmt.Errorf("AMQP 0.9 Connect: %s", err)
}
}
amqpChan, err = conn.Channel()
if err != nil {
return fmt.Errorf("AMQP 0.9 Channel: %s", err)
}
if a.conf.QueueDeclare.Enabled {
if _, err = amqpChan.QueueDeclare(
a.conf.Queue, // name of the queue
a.conf.QueueDeclare.Durable, // durable
false, // delete when unused
false, // exclusive
false, // noWait
nil, // arguments
); err != nil {
return fmt.Errorf("queue Declare: %s", err)
}
}
for _, bConf := range a.conf.BindingsDeclare {
if err = amqpChan.QueueBind(
a.conf.Queue, // name of the queue
bConf.RoutingKey, // bindingKey
bConf.Exchange, // sourceExchange
false, // noWait
nil, // arguments
); err != nil {
return fmt.Errorf("queue Bind: %s", err)
}
}
if err = amqpChan.Qos(
a.conf.PrefetchCount, a.conf.PrefetchSize, false,
); err != nil {
return fmt.Errorf("qos: %s", err)
}
if consumerChan, err = amqpChan.Consume(
a.conf.Queue, // name
a.conf.ConsumerTag, // consumerTag,
false, // noAck
false, // exclusive
false, // noLocal
false, // noWait
nil, // arguments
); err != nil {
return fmt.Errorf("queue Consume: %s", err)
}
a.conn = conn
a.amqpChan = amqpChan
a.consumerChan = consumerChan
a.log.Infof("Receiving AMQP 0.9 messages from queue: %v\n", a.conf.Queue)
return
}
// disconnect safely closes a connection to an AMQP09 server.
func (a *AMQP09) disconnect() error {
a.m.Lock()
defer a.m.Unlock()
if a.amqpChan != nil {
err := a.amqpChan.Cancel(a.conf.ConsumerTag, true)
a.amqpChan = nil
if err != nil {
return fmt.Errorf("consumer cancel failed: %s", err)
}
}
if a.conn != nil {
err := a.conn.Close()
a.conn = nil
if err != nil {
return fmt.Errorf("AMQP 0.9 connection close error: %s", err)
}
}
return nil
}
//------------------------------------------------------------------------------
// ReadWithContext a new AMQP09 message.
func (a *AMQP09) ReadWithContext(ctx context.Context) (types.Message, AsyncAckFn, error) {
var c <-chan amqp.Delivery
a.m.RLock()
if a.conn != nil {
c = a.consumerChan
}
a.m.RUnlock()
if c == nil {
return nil, nil, types.ErrNotConnected
}
msg := message.New(nil)
addPart := func(data amqp.Delivery) {
// Only store the latest delivery tag, but always Ack multiple.
a.ackTag = data.DeliveryTag
part := message.NewPart(data.Body)
for k, v := range data.Headers {
setMetadata(part, k, v)
}
setMetadata(part, "amqp_content_type", data.ContentType)
setMetadata(part, "amqp_content_encoding", data.ContentEncoding)
if data.DeliveryMode != 0 {
setMetadata(part, "amqp_delivery_mode", data.DeliveryMode)
}
setMetadata(part, "amqp_priority", data.Priority)
setMetadata(part, "amqp_correlation_id", data.CorrelationId)
setMetadata(part, "amqp_reply_to", data.ReplyTo)
setMetadata(part, "amqp_expiration", data.Expiration)
setMetadata(part, "amqp_message_id", data.MessageId)
if !data.Timestamp.IsZero() {
setMetadata(part, "amqp_timestamp", data.Timestamp.Unix())
}
setMetadata(part, "amqp_type", data.Type)
setMetadata(part, "amqp_user_id", data.UserId)
setMetadata(part, "amqp_app_id", data.AppId)
setMetadata(part, "amqp_consumer_tag", data.ConsumerTag)
setMetadata(part, "amqp_delivery_tag", data.DeliveryTag)
setMetadata(part, "amqp_redelivered", data.Redelivered)
setMetadata(part, "amqp_exchange", data.Exchange)
setMetadata(part, "amqp_routing_key", data.RoutingKey)
msg.Append(part)
}
select {
case data, open := <-c:
if !open {
a.disconnect()
return nil, nil, types.ErrNotConnected
}
addPart(data)
return msg, func(actx context.Context, res types.Response) error {
if res.Error() != nil {
return data.Nack(false, true)
}
return data.Ack(false)
}, nil
case <-ctx.Done():
}
return nil, nil, types.ErrTimeout
}
// CloseAsync shuts down the AMQP09 input and stops processing requests.
func (a *AMQP09) CloseAsync() {
a.disconnect()
}
// WaitForClose blocks until the AMQP09 input has closed down.
func (a *AMQP09) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------