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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 reader
import (
"fmt"
"sync"
"time"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/streadway/amqp"
)
//------------------------------------------------------------------------------
// AMQPConfig is configuration for the AMQP input type.
type AMQPConfig struct {
URL string `json:"url" yaml:"url"`
Exchange string `json:"exchange" yaml:"exchange"`
ExchangeType string `json:"exchange_type" yaml:"exchange_type"`
Queue string `json:"queue" yaml:"queue"`
BindingKey string `json:"key" yaml:"key"`
ConsumerTag string `json:"consumer_tag" yaml:"consumer_tag"`
PrefetchCount int `json:"prefetch_count" yaml:"prefetch_count"`
PrefetchSize int `json:"prefetch_size" yaml:"prefetch_size"`
}
// NewAMQPConfig creates a new AMQPConfig with default values.
func NewAMQPConfig() AMQPConfig {
return AMQPConfig{
URL: "amqp://guest:guest@localhost:5672/",
Exchange: "benthos-exchange",
ExchangeType: "direct",
Queue: "benthos-queue",
BindingKey: "benthos-key",
ConsumerTag: "benthos-consumer",
PrefetchCount: 10,
PrefetchSize: 0,
}
}
//------------------------------------------------------------------------------
// AMQP is an input type that reads messages via the AMQP 0.91 protocol.
type AMQP struct {
conn *amqp.Connection
amqpChan *amqp.Channel
consumerChan <-chan amqp.Delivery
ackTag uint64
conf AMQPConfig
stats metrics.Type
log log.Modular
m sync.RWMutex
}
// NewAMQP creates a new AMQP input type.
func NewAMQP(conf AMQPConfig, log log.Modular, stats metrics.Type) (Type, error) {
a := AMQP{
conf: conf,
stats: stats,
log: log.NewModule(".input.amqp"),
}
return &a, nil
}
//------------------------------------------------------------------------------
// Connect establishes a connection to an AMQP server.
func (a *AMQP) Connect() (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
conn, err = amqp.Dial(a.conf.URL)
if err != nil {
return fmt.Errorf("AMQP Connect: %s", err)
}
amqpChan, err = conn.Channel()
if err != nil {
return fmt.Errorf("AMQP Channel: %s", err)
}
if err = amqpChan.ExchangeDeclare(
a.conf.Exchange, // name of the exchange
a.conf.ExchangeType, // type
true, // durable
false, // delete when complete
false, // internal
false, // noWait
nil, // arguments
); err != nil {
return fmt.Errorf("Exchange Declare: %s", err)
}
if _, err = amqpChan.QueueDeclare(
a.conf.Queue, // name of the queue
true, // durable
false, // delete when usused
false, // exclusive
false, // noWait
nil, // arguments
); err != nil {
return fmt.Errorf("Queue Declare: %s", err)
}
if err = amqpChan.QueueBind(
a.conf.Queue, // name of the queue
a.conf.BindingKey, // bindingKey
a.conf.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 messages from URL: %s\n", a.conf.URL)
return
}
// disconnect safely closes a connection to an AMQP server.
func (a *AMQP) 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 connection close error: %s", err)
}
}
return nil
}
//------------------------------------------------------------------------------
// Read a new AMQP message.
func (a *AMQP) Read() (types.Message, error) {
var c <-chan amqp.Delivery
a.m.RLock()
if a.conn != nil {
c = a.consumerChan
}
a.m.RUnlock()
if c == nil {
return nil, types.ErrNotConnected
}
data, open := <-c
if !open {
a.disconnect()
return nil, types.ErrNotConnected
}
// Only store the latest delivery tag, but always Ack multiple.
a.ackTag = data.DeliveryTag
return types.NewMessage([][]byte{data.Body}), nil
}
// Acknowledge instructs whether unacknowledged messages have been successfully
// propagated.
func (a *AMQP) Acknowledge(err error) error {
a.m.RLock()
defer a.m.RUnlock()
if err != nil {
return a.amqpChan.Reject(a.ackTag, true)
}
return a.amqpChan.Ack(a.ackTag, true)
}
// CloseAsync shuts down the AMQP input and stops processing requests.
func (a *AMQP) CloseAsync() {
a.disconnect()
}
// WaitForClose blocks until the AMQP input has closed down.
func (a *AMQP) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------