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receiver.go
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receiver.go
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package ramqp
import (
"fmt"
"github.com/streadway/amqp"
"log"
"time"
)
type Receiver struct {
ExchangeType string
ExchangeName string
// The QueueName may be empty, in which case the server will
// generate a unique name
QueueName string
RouteKey string
// OnReceive can not be nil, it will be invoke when receive msg
OnReceive func(*amqp.Delivery) bool
channel *amqp.Channel
// queue declare params
queueDurable bool
queueAutoDel bool
queueExclusive bool
queueNoWait bool
queueArgs amqp.Table
// exchange declare params
exchangeDurable bool
exchangeAutoDel bool
exchangeInternal bool
exchangeNoWait bool
exchangeArgs amqp.Table
// queue bind params
bindNoWait bool
bindArgs amqp.Table
prefetchCount int
prefetchSize int
// consume params
cAutoAck bool
cExclusive bool
cNoLocal bool
cNoWait bool
cArgs amqp.Table
}
func (r *Receiver) init(options []Opt) error {
if r.OnReceive == nil {
return fmt.Errorf("OnReceive can not be nil")
}
r.dealOptions(options)
return nil
}
func (r *Receiver) dealOptions(options []Opt) {
if len(options) < 1 {
return
}
for _, opt := range options {
opt(r)
}
}
func (r *Receiver) createMsgQueue(conn *amqp.Connection) (<-chan amqp.Delivery, error) {
var err error
r.channel, err = conn.Channel()
if err != nil {
return nil, fmt.Errorf("create channel err: %v", err)
}
_, err = r.channel.QueueDeclare(
r.QueueName,
r.queueDurable,
r.queueAutoDel,
r.queueExclusive,
r.queueNoWait,
r.queueArgs,
)
if err != nil {
return nil, fmt.Errorf("queue init err: %v", err)
}
if len(r.ExchangeName) > 0 && len(r.ExchangeType) > 0 {
err = r.channel.ExchangeDeclare(
r.ExchangeName,
r.ExchangeType,
r.exchangeDurable,
r.exchangeAutoDel,
r.exchangeInternal,
r.exchangeNoWait,
r.exchangeArgs,
)
if err != nil {
return nil, fmt.Errorf("exchange declare err: %v", err)
}
err = r.channel.QueueBind(
r.QueueName,
r.RouteKey,
r.ExchangeName,
r.bindNoWait,
r.bindArgs,
)
if err != nil {
return nil, fmt.Errorf("bind queue err: %v", err)
}
}
err = r.channel.Qos(r.prefetchCount, r.prefetchSize, false)
if err != nil {
return nil, fmt.Errorf("set Qos err: %v", err)
}
msgQueue, err := r.channel.Consume(
r.QueueName,
"",
r.cAutoAck,
r.cExclusive,
r.cNoLocal,
r.cNoWait,
r.cArgs,
)
if err != nil {
return nil, fmt.Errorf("consume err: %v", err)
}
return msgQueue, nil
}
func (r *Receiver) listen(conn *amqp.Connection) {
msgQueue, err := r.createMsgQueue(conn)
if err != nil {
log.Println("create msg queue err: ", err)
r.retry(conn)
return
}
// block if success
r.handleMsg(msgQueue)
r.retry(conn)
}
func (r *Receiver) handleMsg(msgQueue <-chan amqp.Delivery) {
closeErr := make(chan *amqp.Error)
r.channel.NotifyClose(closeErr)
for {
select {
case msg, valid := <-msgQueue:
if valid {
go func(msg amqp.Delivery) {
if !r.OnReceive(&msg) {
if !r.cAutoAck {
log.Println("msg process err, requeue now !!!!!!!!!!")
_ = msg.Nack(false, true)
}
}
if !r.cAutoAck {
_ = msg.Ack(false)
}
}(msg)
} else {
return
}
case <-closeErr:
// end handle
return
}
}
}
func (r *Receiver) retry(conn *amqp.Connection) {
go func() {
if !conn.IsClosed() {
time.Sleep(5 * time.Second) // todo exponential backoff
log.Println("receiver retry to listen ...")
r.listen(conn)
}
}()
}