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rabbitmq.go
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rabbitmq.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
// ------------------------------------------------------------
package rabbitmq
import (
"errors"
"fmt"
"strconv"
"time"
"github.com/dapr/components-contrib/bindings"
"github.com/dapr/dapr/pkg/logger"
"github.com/streadway/amqp"
)
const (
host = "host"
queueName = "queueName"
durable = "durable"
deleteWhenUnused = "deleteWhenUnused"
prefetchCount = "prefetchCount"
rabbitMQQueueMessageTTLKey = "x-message-ttl"
defaultBase = 10
defaultBitSize = 0
)
// RabbitMQ allows sending/receiving data to/from RabbitMQ
type RabbitMQ struct {
connection *amqp.Connection
channel *amqp.Channel
metadata rabbitMQMetadata
logger logger.Logger
queue amqp.Queue
}
// Metadata is the rabbitmq config
type rabbitMQMetadata struct {
Host string `json:"host"`
QueueName string `json:"queueName"`
Durable bool `json:"durable,string"`
DeleteWhenUnused bool `json:"deleteWhenUnused,string"`
PrefetchCount int `json:"prefetchCount"`
defaultQueueTTL *time.Duration
}
// NewRabbitMQ returns a new rabbitmq instance
func NewRabbitMQ(logger logger.Logger) *RabbitMQ {
return &RabbitMQ{logger: logger}
}
// Init does metadata parsing and connection creation
func (r *RabbitMQ) Init(metadata bindings.Metadata) error {
err := r.parseMetadata(metadata)
if err != nil {
return err
}
conn, err := amqp.Dial(r.metadata.Host)
if err != nil {
return err
}
ch, err := conn.Channel()
if err != nil {
return err
}
ch.Qos(r.metadata.PrefetchCount, 0, true)
r.connection = conn
r.channel = ch
q, err := r.declareQueue()
if err != nil {
return err
}
r.queue = q
return nil
}
func (r *RabbitMQ) Operations() []bindings.OperationKind {
return []bindings.OperationKind{bindings.CreateOperation}
}
func (r *RabbitMQ) Invoke(req *bindings.InvokeRequest) (*bindings.InvokeResponse, error) {
pub := amqp.Publishing{
DeliveryMode: amqp.Persistent,
ContentType: "text/plain",
Body: req.Data,
}
ttl, ok, err := bindings.TryGetTTL(req.Metadata)
if err != nil {
return nil, err
}
// The default time to live has been set in the queue
// We allow overriding on each call, by setting a value in request metadata
if ok {
// RabbitMQ expects the duration in ms
pub.Expiration = strconv.FormatInt(ttl.Milliseconds(), 10)
}
err = r.channel.Publish("", r.metadata.QueueName, false, false, pub)
if err != nil {
return nil, err
}
return nil, nil
}
func (r *RabbitMQ) parseMetadata(metadata bindings.Metadata) error {
m := rabbitMQMetadata{}
if val, ok := metadata.Properties[host]; ok && val != "" {
m.Host = val
} else {
return errors.New("rabbitMQ binding error: missing host address")
}
if val, ok := metadata.Properties[queueName]; ok && val != "" {
m.QueueName = val
} else {
return errors.New("rabbitMQ binding error: missing queue Name")
}
if val, ok := metadata.Properties[durable]; ok && val != "" {
d, err := strconv.ParseBool(val)
if err != nil {
return fmt.Errorf("rabbitMQ binding error: can't parse durable field: %s", err)
}
m.Durable = d
}
if val, ok := metadata.Properties[deleteWhenUnused]; ok && val != "" {
d, err := strconv.ParseBool(val)
if err != nil {
return fmt.Errorf("rabbitMQ binding error: can't parse deleteWhenUnused field: %s", err)
}
m.DeleteWhenUnused = d
}
if val, ok := metadata.Properties[prefetchCount]; ok && val != "" {
parsedVal, err := strconv.ParseInt(val, defaultBase, defaultBitSize)
if err != nil {
return fmt.Errorf("rabbitMQ binding error: can't parse prefetchCount field: %s", err)
}
m.PrefetchCount = int(parsedVal)
}
ttl, ok, err := bindings.TryGetTTL(metadata.Properties)
if err != nil {
return err
}
if ok {
m.defaultQueueTTL = &ttl
}
r.metadata = m
return nil
}
func (r *RabbitMQ) declareQueue() (amqp.Queue, error) {
args := amqp.Table{}
if r.metadata.defaultQueueTTL != nil {
// Value in ms
ttl := *r.metadata.defaultQueueTTL / time.Millisecond
args[rabbitMQQueueMessageTTLKey] = int(ttl)
}
return r.channel.QueueDeclare(r.metadata.QueueName, r.metadata.Durable, r.metadata.DeleteWhenUnused, false, false, args)
}
func (r *RabbitMQ) Read(handler func(*bindings.ReadResponse) error) error {
msgs, err := r.channel.Consume(
r.queue.Name,
"",
false,
false,
false,
false,
nil,
)
if err != nil {
return err
}
forever := make(chan bool)
go func() {
for d := range msgs {
err := handler(&bindings.ReadResponse{
Data: d.Body,
})
if err == nil {
r.channel.Ack(d.DeliveryTag, false)
}
}
}()
<-forever
return nil
}